"""Unified project endpoints for the new dashboard (Task #4 backend).

Replaces the old separate /api/workspace + /api/ralph payloads with a single
/api/projects view that merges:

  - workspace dirs (`~/workspace/<slug>/`)
  - approved-tasks.json entries
  - per-project Ralph PRD (`scripts/ralph/prd.json`)

Endpoints exposed via the mixin:

    GET  /api/projects                        — full list + version
    GET  /api/projects/signature              — change-detection hash for SSE
    GET  /api/projects/stream                 — SSE stream of changes
    GET  /api/projects/<slug>/plan/state
    GET  /api/projects/<slug>/plan/transcript

    POST /api/projects/propose
    POST /api/projects/approve                (If-Match: <version>)
    POST /api/projects/unapprove              (If-Match: <version>)
    POST /api/projects/cancel                 (If-Match: <version>)
    POST /api/projects/<slug>/plan/start
    POST /api/projects/<slug>/plan/respond
    POST /api/projects/<slug>/plan/finalize
    POST /api/projects/<slug>/plan/cancel
    POST /api/projects/<slug>/plan/advance

Status derivation (one of these strings — see `_derive_status`):

    running-ralph   — has PID, /proc/<pid>/cmdline contains ralph.sh
    running-manual  — has PID, alive, but not ralph.sh
    planning        — approved-tasks.json entry has status=planning
    approved        — entry has status=approved (waiting for night-execute)
    pending         — entry has status=pending
    blocked         — prd has stories, all incomplete are blocked
    failed          — prd has stories, last run had failures
    complete        — prd has stories, all passes==True
    idle            — workspace dir exists but no signal
"""
from __future__ import annotations

import hashlib
import json
import logging
import os
import re
import subprocess
import sys
import time
from datetime import datetime, timezone
from pathlib import Path
from urllib.parse import parse_qs, urlparse

import constants

from handlers._validators import parse_json_body, validate_description, validate_slug

# Make `from src.x import ...` work — same trick youtube.py uses.
if str(constants.BASE_DIR) not in sys.path:
    sys.path.insert(0, str(constants.BASE_DIR))

log = logging.getLogger(__name__)

APPROVED_TASKS_FILE = constants.BASE_DIR / "approved-tasks.json"


class _StaleVersion(Exception):
    """Raised inside a write_approved mutator to abort on If-Match mismatch."""
    pass

# Module-level signature cache — only re-run `git status --porcelain` when the
# repo's `.git/index` mtime advances. Keeps SSE polling cheap.
_SIG_CACHE: dict = {"git_mtime": None, "signature": None, "ts": 0.0}


# ─── helpers ───────────────────────────────────────────────────────────


def _now_iso() -> str:
    return datetime.now(timezone.utc).isoformat()


def _read_approved() -> dict:
    """Read approved-tasks.json under a shared flock."""
    try:
        from src.jsonlock import read_locked  # type: ignore
        return read_locked(str(APPROVED_TASKS_FILE))
    except FileNotFoundError:
        return {"projects": [], "last_updated": None, "version": 0}
    except (json.JSONDecodeError, OSError) as exc:  # pragma: no cover
        log.error("approved-tasks.json read failed: %s", exc)
        return {"projects": [], "last_updated": None, "version": 0}


def _write_approved(mutator):
    """Persist approved-tasks.json under an exclusive flock + atomic replace."""
    from src.jsonlock import write_locked  # type: ignore

    def _wrap(data: dict) -> dict:
        if not isinstance(data, dict):
            data = {}
        data.setdefault("projects", [])
        data = mutator(data)
        data["last_updated"] = _now_iso()
        return data

    return write_locked(str(APPROVED_TASKS_FILE), _wrap)


def _find_project(data: dict, slug: str) -> dict | None:
    for p in data.get("projects", []) or []:
        if (p.get("name") or "").lower() == slug.lower():
            return p
    return None


def _read_prd(project_dir: Path) -> dict | None:
    prd_path = project_dir / "scripts" / "ralph" / "prd.json"
    if not prd_path.exists():
        return None
    try:
        return json.loads(prd_path.read_text(encoding="utf-8"))
    except (json.JSONDecodeError, OSError):
        return None


def _pid_alive_with_cmdline(pid: int | None) -> tuple[bool, str]:
    """(alive, cmdline) — cmdline is empty string if not readable."""
    if not pid or not isinstance(pid, int):
        return False, ""
    try:
        os.kill(pid, 0)
    except (ProcessLookupError, PermissionError, OSError):
        return False, ""
    cmdline = ""
    try:
        with open(f"/proc/{pid}/cmdline", "rb") as f:
            cmdline = f.read().decode("utf-8", errors="replace").replace("\x00", " ")
    except (FileNotFoundError, PermissionError, OSError):
        cmdline = ""
    return True, cmdline


# ─── status derivation ────────────────────────────────────────────────


def _derive_status(slug, approved_entry, workspace_dir, prd_data) -> str:
    """Compute one of nine UI states (see module docstring)."""
    # Process signal trumps everything else.
    pid = (approved_entry or {}).get("pid")
    alive, cmdline = _pid_alive_with_cmdline(pid)
    if alive:
        if "ralph.sh" in cmdline:
            return "running-ralph"
        return "running-manual"

    # Approved-tasks entry status (planning/approved/pending takes precedence
    # over PRD-derived states because the user explicitly set it).
    if approved_entry:
        s = (approved_entry.get("status") or "").lower()
        if s == "planning":
            return "planning"
        if s == "approved":
            return "approved"
        if s == "pending":
            return "pending"
        if s in ("complete", "completed"):
            # fall through to prd check — explicit complete wins if prd matches
            pass
        if s == "failed":
            return "failed"
        if s in ("cancelled", "canceled"):
            return "idle"

    # PRD-derived states (only for projects that ran Ralph).
    stories = (prd_data or {}).get("userStories") or []
    if stories:
        all_pass = all(bool(s.get("passes")) for s in stories)
        any_pass = any(bool(s.get("passes")) for s in stories)
        if all_pass:
            return "complete"
        # Distinguish blocked vs failed using per-story flags.
        incomplete = [s for s in stories if not s.get("passes")]
        if incomplete and all(s.get("blocked") for s in incomplete):
            return "blocked"
        if any(s.get("failed") for s in stories):
            return "failed"
        if any_pass:
            # partial progress without active PID — call it idle (re-runnable)
            return "idle"

    return "idle"


def _stories_progress(prd_data: dict | None) -> tuple[int, int]:
    stories = (prd_data or {}).get("userStories") or []
    total = len(stories)
    done = sum(1 for s in stories if s.get("passes"))
    return total, done


def _last_iter_mtime(project_dir: Path) -> float | None:
    logs = project_dir / "scripts" / "ralph" / "logs"
    if not logs.exists():
        return None
    try:
        files = list(logs.glob("iteration-*.log"))
        if not files:
            return None
        return max(f.stat().st_mtime for f in files)
    except OSError:
        return None


def _eta_seconds(prd_data, total, done, last_iter_mtime) -> int | None:
    """Crude ETA: 12 minutes per remaining story (matches RalphHandlers)."""
    if total <= 0:
        return None
    remaining = total - done
    if remaining <= 0:
        return 0
    return remaining * 12 * 60


def _last_message_preview(slug: str) -> str:
    """Return the most recent planning excerpt for any adapter on this slug.

    The dashboard owns adapter="dashboard" but we also surface chats started
    via discord/telegram so the unified UI reflects reality.
    """
    try:
        from src.planning_session import _load_planning_state  # type: ignore
    except Exception:  # pragma: no cover — defensive
        return ""
    try:
        state = _load_planning_state()
    except Exception:
        return ""
    best = ""
    best_ts = ""
    for _key, entry in state.items():
        if (entry.get("slug") or "").lower() != slug.lower():
            continue
        ts = entry.get("updated_at") or entry.get("started_at") or ""
        excerpt = entry.get("last_text_excerpt") or ""
        if ts >= best_ts and excerpt:
            best = excerpt
            best_ts = ts
    return best[:200]


# ─── planning transcript helpers ──────────────────────────────────────


_EXTERNAL_CONTENT_RE = re.compile(
    r"^\s*\[EXTERNAL CONTENT\]\s*\n(.*)\n\[END EXTERNAL CONTENT\]\s*$",
    re.DOTALL,
)
_COMMAND_ARGS_RE = re.compile(r"<command-args>(.*?)</command-args>", re.DOTALL)


def _planning_jsonl_path(slug: str, session_id: str) -> Path | None:
    """Path to the Claude CLI JSONL transcript for a planning session.

    PlanningSession runs with cwd = `~/workspace/<slug>/` if it exists, else
    falls back to the echo-core repo root (see `PlanningSession.cwd`).
    Claude CLI stores transcripts under
    `~/.claude/projects/<encoded-cwd>/<session_id>.jsonl`, where encoded-cwd
    is the absolute path with `/` replaced by `-`.
    """
    if not session_id:
        return None
    workspace = constants.WORKSPACE_DIR / slug
    cwd = workspace if workspace.is_dir() else constants.BASE_DIR
    encoded = str(cwd).replace("/", "-")
    return Path.home() / ".claude" / "projects" / encoded / f"{session_id}.jsonl"


def _clean_user_text(text: str) -> str:
    """Strip wrappers Echo adds around user input sent to the planning subprocess."""
    m = _EXTERNAL_CONTENT_RE.match(text)
    if m:
        text = m.group(1).strip()
    if "<command-name>" in text:
        m = _COMMAND_ARGS_RE.search(text)
        if m:
            text = m.group(1).strip()
    return text


def _extract_text_blocks(content) -> str:
    """Concatenate `text`-type blocks from a Claude `message.content` field."""
    if isinstance(content, str):
        return content
    if isinstance(content, list):
        parts = []
        for block in content:
            if isinstance(block, dict) and block.get("type") == "text":
                t = block.get("text") or ""
                if t:
                    parts.append(t)
        return "\n\n".join(parts)
    return ""


def _load_planning_history(slug: str, session_id: str | None) -> list[dict]:
    """Parse the Claude session JSONL into a `[{role, text}, ...]` chat history.

    Skips queue / system / tool-result entries. Empty list on any structural
    problem so callers can fall back to `last_text_excerpt`.
    """
    if not session_id:
        return []
    path = _planning_jsonl_path(slug, session_id)
    if path is None or not path.exists():
        return []
    history: list[dict] = []
    try:
        with path.open(encoding="utf-8") as fh:
            for raw in fh:
                raw = raw.strip()
                if not raw:
                    continue
                try:
                    entry = json.loads(raw)
                except json.JSONDecodeError:
                    continue
                etype = entry.get("type")
                if etype not in ("user", "assistant"):
                    continue
                if etype == "user" and "toolUseResult" in entry:
                    continue
                if entry.get("isMeta"):
                    continue
                msg = entry.get("message") or {}
                text = _extract_text_blocks(msg.get("content"))
                if etype == "user":
                    text = _clean_user_text(text)
                text = (text or "").strip()
                if not text:
                    continue
                history.append({"role": etype, "text": text})
    except OSError:
        return []
    return history


# ─── version helpers ──────────────────────────────────────────────────


def _get_version_from(data: dict) -> int:
    try:
        return int(data.get("version") or 0)
    except (TypeError, ValueError):
        return 0


def _bump_version(data: dict) -> dict:
    data["version"] = _get_version_from(data) + 1
    return data


# ─── signature for SSE change detection ───────────────────────────────


def _git_index_mtime() -> float | None:
    idx = constants.BASE_DIR / ".git" / "index"
    try:
        return idx.stat().st_mtime
    except OSError:
        return None


def _compute_signature() -> str:
    """Hash of (git porcelain status, workspace count, approved-tasks version).

    Uses the cached value when `.git/index` mtime hasn't changed.
    """
    now = time.monotonic()
    git_mtime = _git_index_mtime()
    cached_mtime = _SIG_CACHE.get("git_mtime")
    cached_sig = _SIG_CACHE.get("signature")

    # Always include workspace count + approved version + per-project mtimes
    # in the signature (cheap stat). Only the git porcelain piece is cached.
    ws_count = 0
    project_marks: list[tuple] = []
    if constants.WORKSPACE_DIR.exists():
        for entry in sorted(constants.WORKSPACE_DIR.iterdir()):
            if not entry.is_dir() or entry.name.startswith("."):
                continue
            ws_count += 1
            prd = entry / "scripts" / "ralph" / "prd.json"
            pid_file = entry / "scripts" / "ralph" / ".ralph.pid"
            try:
                pmt = prd.stat().st_mtime if prd.exists() else 0
            except OSError:
                pmt = 0
            try:
                pid_mt = pid_file.stat().st_mtime if pid_file.exists() else 0
            except OSError:
                pid_mt = 0
            project_marks.append((entry.name, pmt, pid_mt))

    # Approved version
    approved = _read_approved()
    version = _get_version_from(approved)

    # Git porcelain — cached on .git/index mtime
    if git_mtime == cached_mtime and cached_sig is not None:
        git_part = cached_sig
    else:
        try:
            res = subprocess.run(
                ["git", "status", "--porcelain"],
                cwd=str(constants.BASE_DIR),
                capture_output=True, text=True, timeout=5,
            )
            git_part = res.stdout if res.returncode == 0 else ""
        except (subprocess.TimeoutExpired, FileNotFoundError, OSError):
            git_part = ""
        _SIG_CACHE["git_mtime"] = git_mtime
        _SIG_CACHE["signature"] = git_part
        _SIG_CACHE["ts"] = now

    h = hashlib.sha256()
    h.update(git_part.encode("utf-8", errors="replace"))
    h.update(str(ws_count).encode())
    h.update(str(version).encode())
    for name, pmt, pid_mt in project_marks:
        h.update(name.encode("utf-8"))
        h.update(f"{pmt:.3f}|{pid_mt:.3f}".encode())
    return h.hexdigest()


# ─── projects mixin ───────────────────────────────────────────────────


class ProjectsHandlers:
    """Mixin: /api/projects/* endpoints — unified workspace + Ralph + planning."""

    # ── helpers (instance) ─────────────────────────────────────────
    def _get_version(self) -> int:
        return _get_version_from(_read_approved())

    def _increment_version(self, data: dict) -> dict:
        return _bump_version(data)

    def _derive_status(self, slug, approved_entry, workspace_entry, prd_data) -> str:
        return _derive_status(slug, approved_entry, workspace_entry, prd_data)

    def _build_unified_payload(self) -> dict:
        approved = _read_approved()
        approved_entries: dict[str, dict] = {
            (p.get("name") or "").lower(): p for p in approved.get("projects", []) or []
        }

        # Walk workspace dirs first so we capture projects even without an
        # approved-tasks entry.
        slugs_seen: set[str] = set()
        result: list[dict] = []
        if constants.WORKSPACE_DIR.exists():
            for entry in sorted(constants.WORKSPACE_DIR.iterdir()):
                if not entry.is_dir() or entry.name.startswith("."):
                    continue
                slug = entry.name
                slugs_seen.add(slug.lower())
                ae = approved_entries.get(slug.lower())
                prd = _read_prd(entry)
                result.append(self._project_record(slug, entry, ae, prd))

        # Then projects that exist only in approved-tasks (no workspace yet).
        for ae in approved.get("projects", []) or []:
            slug = ae.get("name") or ""
            if not slug or slug.lower() in slugs_seen:
                continue
            result.append(self._project_record(slug, None, ae, None))

        return {
            "projects": sorted(result, key=lambda p: p.get("slug") or ""),
            "version": _get_version_from(approved),
            "fetchedAt": _now_iso(),
            "count": len(result),
        }

    def _project_record(self, slug, workspace_dir, approved_entry, prd_data) -> dict:
        status = _derive_status(slug, approved_entry, workspace_dir, prd_data)
        total, done = _stories_progress(prd_data)
        last_iter = _last_iter_mtime(workspace_dir) if workspace_dir else None
        eta = _eta_seconds(prd_data, total, done, last_iter)
        ae = approved_entry or {}
        return {
            "slug": slug,
            "status": status,
            "name": slug,
            "description": ae.get("description") or "",
            "proposed_at": ae.get("proposed_at"),
            "approved_at": ae.get("approved_at"),
            "started_at": ae.get("started_at"),
            "pid": ae.get("pid"),
            "stories_total": total,
            "stories_done": done,
            "eta_seconds": eta,
            "last_message_preview": _last_message_preview(slug),
            "error_reason": ae.get("error") or "",
            "has_workspace": workspace_dir is not None,
            "has_prd": prd_data is not None,
        }

    # ── GET /api/projects ──────────────────────────────────────────
    def handle_unified_status(self):
        try:
            self.send_json(self._build_unified_payload())
        except Exception as exc:
            log.exception("handle_unified_status failed")
            self.send_json({"error": str(exc)}, 500)

    # ── GET /api/projects/signature ────────────────────────────────
    def handle_unified_signature(self):
        try:
            sig = _compute_signature()
            approved = _read_approved()
            self.send_json({
                "signature": sig,
                "version": _get_version_from(approved),
                "fetchedAt": _now_iso(),
            })
        except Exception as exc:
            log.exception("handle_unified_signature failed")
            self.send_json({"error": str(exc)}, 500)

    # ── GET /api/projects/stream (SSE) ────────────────────────────
    def handle_projects_stream(self):
        """Stream `data: <payload>\\n\\n` whenever the signature changes.

        Explicit cookie check (the global POST middleware doesn't cover GET).
        Keep-alive ping every 15s. Exits cleanly on BrokenPipe.
        """
        # Auth: require cookie even though this is a GET.
        if hasattr(self, "_check_dashboard_cookie") and not self._check_dashboard_cookie():
            body = b'{"error":"Unauthorized"}'
            try:
                self.send_response(401)
                self.send_header("Content-Type", "application/json")
                self.send_header("Content-Length", str(len(body)))
                self.end_headers()
                self.wfile.write(body)
            except (BrokenPipeError, ConnectionResetError):
                pass
            return

        # CSRF/Origin allowlist (skipped if no Origin/Referer — curl etc).
        origin = self.headers.get("Origin", "") or ""
        referer = self.headers.get("Referer", "") or ""
        allowed = ["http://127.0.0.1:8088", "http://localhost:8088"]
        dh = os.environ.get("DASHBOARD_HOST", "").strip()
        if dh:
            allowed.append(dh)
        if origin or referer:
            check = origin or referer
            if not any(check.startswith(a) for a in allowed):
                body = b'{"error":"CSRF"}'
                try:
                    self.send_response(403)
                    self.send_header("Content-Type", "application/json")
                    self.send_header("Content-Length", str(len(body)))
                    self.end_headers()
                    self.wfile.write(body)
                except (BrokenPipeError, ConnectionResetError):
                    pass
                return

        try:
            self.send_response(200)
            self.send_header("Content-Type", "text/event-stream")
            self.send_header("Cache-Control", "no-cache")
            self.send_header("X-Accel-Buffering", "no")
            self.send_header("Connection", "keep-alive")
            self.end_headers()
        except (BrokenPipeError, ConnectionResetError):
            return

        last_sig: str | None = None
        last_ping = time.monotonic()

        # Initial snapshot
        try:
            payload = self._build_unified_payload()
            last_sig = _compute_signature()
            self.wfile.write(b"data: " + json.dumps(payload).encode("utf-8") + b"\n\n")
            self.wfile.flush()
        except (BrokenPipeError, ConnectionResetError):
            return
        except Exception as exc:
            try:
                err = json.dumps({"error": str(exc)}).encode("utf-8")
                self.wfile.write(b"data: " + err + b"\n\n")
                self.wfile.flush()
            except Exception:
                pass
            return

        while True:
            try:
                time.sleep(2)
                sig = _compute_signature()
                now = time.monotonic()
                if sig != last_sig:
                    payload = self._build_unified_payload()
                    body = json.dumps(payload).encode("utf-8")
                    self.wfile.write(b"data: " + body + b"\n\n")
                    self.wfile.flush()
                    last_sig = sig
                    last_ping = now
                elif now - last_ping >= 15:
                    self.wfile.write(b'data: {"type":"ping"}\n\n')
                    self.wfile.flush()
                    last_ping = now
            except (BrokenPipeError, ConnectionResetError):
                return
            except Exception:
                # Best-effort: one bad iter shouldn't kill the stream.
                continue

    # ── POST /api/projects/propose ─────────────────────────────────
    def handle_propose(self):
        body = parse_json_body(self)
        if body is None:
            return  # parse_json_body already sent 400
        slug = (body.get("slug") or "").strip()
        description = (body.get("description") or "").strip()

        slug_err = validate_slug(slug)
        desc_err = validate_description(description)
        if slug_err or desc_err:
            errors: dict[str, str] = {}
            if slug_err:
                errors["slug"] = slug_err
            if desc_err:
                errors["description"] = desc_err
            self.send_json({"error": "validation_failed", "fields": errors}, 400)
            return

        existing = _find_project(_read_approved(), slug)
        if existing:
            self.send_json(
                {"error": "duplicate_slug", "slug": slug, "status": existing.get("status")},
                409,
            )
            return

        def _add(data: dict) -> dict:
            # Re-check inside the lock — guard against races.
            if _find_project(data, slug) is not None:
                raise FileExistsError(slug)
            data["projects"].append({
                "name": slug,
                "description": description,
                "status": "pending",
                "planning_session_id": None,
                "final_plan_path": None,
                "proposed_at": _now_iso(),
                "approved_at": None,
                "started_at": None,
                "pid": None,
            })
            _bump_version(data)
            return data

        try:
            _write_approved(_add)
        except FileExistsError:
            self.send_json({"error": "duplicate_slug", "slug": slug}, 409)
            return
        except Exception as exc:
            log.exception("propose failed")
            self.send_json({"error": str(exc)}, 500)
            return
        self.send_json({"slug": slug, "status": "pending"}, 201)

    # ── helpers for approve/unapprove/cancel ──────────────────────
    def _read_if_match(self) -> int | None:
        raw = self.headers.get("If-Match", "") or self.headers.get("if-match", "")
        if not raw:
            return None
        raw = raw.strip().strip('"')
        try:
            return int(raw)
        except (TypeError, ValueError):
            return None

    def _set_status_locked(self, slug: str, target_status: str, **extra) -> tuple[bool, dict]:
        """Mutate approved-tasks: set status + extra fields. Bumps version.

        Returns (ok, project_entry_or_error_dict).
        """
        client_ver = self._read_if_match()

        captured: dict = {}

        def _mut(data: dict) -> dict:
            current_ver = _get_version_from(data)
            if client_ver is not None and current_ver != client_ver:
                captured["error"] = "stale"
                captured["current_version"] = current_ver
                raise _StaleVersion()
            proj = _find_project(data, slug)
            if proj is None:
                captured["error"] = "not_found"
                raise KeyError(slug)
            proj["status"] = target_status
            for k, v in extra.items():
                if v is None and k in proj:
                    proj[k] = None
                else:
                    proj[k] = v
            captured["project"] = proj
            _bump_version(data)
            return data

        try:
            _write_approved(_mut)
        except _StaleVersion:
            return False, {
                "error": "stale",
                "current_version": captured.get("current_version", 0),
            }
        except KeyError:
            return False, {"error": "not_found", "slug": slug}
        except Exception as exc:
            log.exception("status mutate failed")
            return False, {"error": str(exc)}
        return True, captured.get("project", {})

    # ── POST /api/projects/approve ─────────────────────────────────
    def handle_approve(self):
        body = parse_json_body(self)
        if body is None:
            return
        slug = (body.get("slug") or "").strip()
        if validate_slug(slug):
            self.send_json({"error": "invalid_slug"}, 400)
            return
        ok, payload = self._set_status_locked(slug, "approved", approved_at=_now_iso())
        if not ok:
            code = 409 if payload.get("error") == "stale" else 404 if payload.get("error") == "not_found" else 500
            self.send_json(payload, code)
            return
        self.send_json({"ok": True, "slug": slug, "status": "approved"})

    # ── POST /api/projects/unapprove ──────────────────────────────
    def handle_unapprove(self):
        body = parse_json_body(self)
        if body is None:
            return
        slug = (body.get("slug") or "").strip()
        if validate_slug(slug):
            self.send_json({"error": "invalid_slug"}, 400)
            return
        ok, payload = self._set_status_locked(slug, "pending", approved_at=None)
        if not ok:
            code = 409 if payload.get("error") == "stale" else 404 if payload.get("error") == "not_found" else 500
            self.send_json(payload, code)
            return
        self.send_json({"ok": True, "slug": slug, "status": "pending"})

    # ── POST /api/projects/cancel ─────────────────────────────────
    def handle_cancel(self):
        """Cancel a project. Sets status=cancelled (matches router behaviour)."""
        body = parse_json_body(self)
        if body is None:
            return
        slug = (body.get("slug") or "").strip()
        if validate_slug(slug):
            self.send_json({"error": "invalid_slug"}, 400)
            return
        ok, payload = self._set_status_locked(slug, "cancelled")
        if not ok:
            code = 409 if payload.get("error") == "stale" else 404 if payload.get("error") == "not_found" else 500
            self.send_json(payload, code)
            return
        self.send_json({"ok": True, "slug": slug, "status": "cancelled"})

    # ── planning state helpers ────────────────────────────────────
    @staticmethod
    def _planning_key(slug: str) -> tuple[str, str]:
        """Dashboard planning sessions live in adapter='dashboard', channel=slug."""
        return ("dashboard", slug)

    @staticmethod
    def _resolve_planning_key(slug: str) -> tuple[str, str]:
        """Find the active session's (adapter, channel) for slug, regardless of
        where it was started. Falls back to ('dashboard', slug) if nothing
        matches — preserving prior behavior for the no-session case.

        Picks the most-recently-updated entry when multiple exist.
        """
        try:
            from src.planning_session import _load_planning_state  # type: ignore
        except Exception:
            return ("dashboard", slug)
        try:
            all_state = _load_planning_state()
        except Exception:
            return ("dashboard", slug)

        matches = [
            entry for entry in all_state.values()
            if (entry.get("slug") or "").lower() == slug.lower()
        ]
        if not matches:
            return ("dashboard", slug)
        matches.sort(key=lambda e: e.get("updated_at") or "", reverse=True)
        best = matches[0]
        adapter = best.get("adapter") or "dashboard"
        channel = best.get("channel_id") or slug
        return (adapter, channel)

    # ── POST /api/projects/<slug>/plan/start ──────────────────────
    def handle_plan_start(self, slug: str):
        if validate_slug(slug):
            self.send_json({"error": "invalid_slug"}, 400)
            return
        body = parse_json_body(self)
        if body is None:
            return
        description = (body.get("description") or "").strip()

        # Description fallback: use the existing approved-tasks description so
        # users can re-open planning on a project they already proposed.
        if not description:
            existing = _find_project(_read_approved(), slug)
            if existing:
                description = (existing.get("description") or "").strip()
        desc_err = validate_description(description) if description else "description required"
        if desc_err:
            self.send_json({"error": "invalid_description", "message": desc_err}, 400)
            return

        # Set status=planning + ensure entry exists.
        def _mut(data: dict) -> dict:
            proj = _find_project(data, slug)
            if proj is None:
                proj = {
                    "name": slug,
                    "description": description,
                    "status": "planning",
                    "planning_session_id": None,
                    "final_plan_path": None,
                    "proposed_at": _now_iso(),
                    "approved_at": None,
                    "started_at": None,
                    "pid": None,
                }
                data["projects"].append(proj)
            else:
                proj["status"] = "planning"
                if not proj.get("description"):
                    proj["description"] = description
            _bump_version(data)
            return data

        try:
            _write_approved(_mut)
        except Exception as exc:
            log.exception("plan/start mutate failed")
            self.send_json({"error": str(exc)}, 500)
            return

        adapter, channel = self._planning_key(slug)
        try:
            from src.planning_orchestrator import PlanningOrchestrator  # type: ignore
            session, first_text = PlanningOrchestrator.start(
                slug=slug,
                description=description,
                channel_id=channel,
                adapter=adapter,
            )
        except Exception as exc:
            log.exception("PlanningOrchestrator.start failed for %s", slug)
            # Roll status back so the dashboard reflects reality.
            try:
                self._set_status_locked(slug, "pending")
            except Exception:
                pass
            self.send_json({"error": "planning_start_failed", "message": str(exc)}, 500)
            return

        # Stash planning_session_id on the entry.
        def _stash(data: dict) -> dict:
            proj = _find_project(data, slug)
            if proj is not None:
                proj["planning_session_id"] = session.planning_session_id
            return data

        try:
            _write_approved(_stash)
        except Exception:
            pass

        self.send_json({
            "ok": True,
            "slug": slug,
            "session_id": session.planning_session_id,
            "phase": session.phase,
            "message": first_text,
        })

    # ── POST /api/projects/<slug>/plan/respond ────────────────────
    def handle_plan_respond(self, slug: str):
        if validate_slug(slug):
            self.send_json({"error": "invalid_slug"}, 400)
            return
        body = parse_json_body(self)
        if body is None:
            return
        message = (body.get("message") or "").strip()
        if not message:
            self.send_json({"error": "message required"}, 400)
            return

        adapter, channel = self._resolve_planning_key(slug)
        try:
            from src.planning_orchestrator import PlanningOrchestrator  # type: ignore
            session, text, phase_ready = PlanningOrchestrator.respond(
                adapter=adapter, channel_id=channel, message=message,
            )
        except Exception as exc:
            log.exception("plan/respond failed for %s", slug)
            self.send_json({"error": str(exc)}, 500)
            return

        if session is None:
            self.send_json(
                {"error": "no_active_session", "message": "Nu există o sesiune activă pentru acest slug."},
                404,
            )
            return
        self.send_json({
            "ok": True,
            "slug": slug,
            "phase": session.phase,
            "phase_ready": phase_ready,
            "message": text,
        })

    # ── GET /api/projects/<slug>/plan/state ───────────────────────
    def handle_plan_state(self, slug: str):
        if validate_slug(slug):
            self.send_json({"error": "invalid_slug"}, 400)
            return
        adapter, channel = self._planning_key(slug)
        try:
            from src.planning_session import get_planning_state  # type: ignore
        except Exception as exc:
            self.send_json({"error": str(exc)}, 500)
            return
        state = get_planning_state(adapter, channel)
        # Also try cross-adapter fallback so the dashboard surfaces sessions
        # started via discord/telegram.
        if state is None:
            try:
                from src.planning_session import _load_planning_state  # type: ignore
                all_state = _load_planning_state()
                for _k, entry in all_state.items():
                    if (entry.get("slug") or "").lower() == slug.lower():
                        state = entry
                        break
            except Exception:
                pass
        if state is None:
            self.send_json({"slug": slug, "status": "expired", "phase": None, "pending_response": False})
            return
        # Heuristic: phase=='__complete__' means the pipeline finished.
        phase = state.get("phase")
        completed = phase == "__complete__"
        self.send_json({
            "slug": slug,
            "status": "complete" if completed else "active",
            "phase": phase,
            "phases_completed": state.get("phases_completed") or [],
            "phases_planned": state.get("phases_planned") or [],
            "pending_response": False,
            "since": state.get("started_at"),
            "updated_at": state.get("updated_at"),
            "session_id": state.get("session_id"),
            "planning_session_id": state.get("planning_session_id"),
            "last_text_excerpt": state.get("last_text_excerpt") or "",
            "final_plan_path": state.get("final_plan_path"),
        })

    # ── GET /api/projects/<slug>/plan/transcript ──────────────────
    def handle_plan_transcript(self, slug: str):
        """Return planning transcript.

        The planning subprocess persists only the latest excerpt + metadata
        in `sessions/planning.json` (full transcripts live inside Claude CLI
        session state). We return what's available, plus the final-plan
        markdown if it has been written.
        """
        if validate_slug(slug):
            self.send_json({"error": "invalid_slug"}, 400)
            return
        adapter, channel = self._planning_key(slug)
        try:
            from src.planning_session import get_planning_state, _load_planning_state  # type: ignore
        except Exception as exc:
            self.send_json({"error": str(exc)}, 500)
            return
        state = get_planning_state(adapter, channel)
        if state is None:
            try:
                all_state = _load_planning_state()
                for _k, entry in all_state.items():
                    if (entry.get("slug") or "").lower() == slug.lower():
                        state = entry
                        break
            except Exception:
                pass
        final_plan_text = ""
        final_plan_path = None
        try:
            fp = constants.WORKSPACE_DIR / slug / "scripts" / "ralph" / "final-plan.md"
            if fp.exists():
                final_plan_path = str(fp)
                final_plan_text = fp.read_text(encoding="utf-8", errors="replace")
        except OSError:
            pass
        session_id = (state or {}).get("session_id") or ""
        history = _load_planning_history(slug, session_id)
        self.send_json({
            "slug": slug,
            "phase": (state or {}).get("phase"),
            "phases_completed": (state or {}).get("phases_completed") or [],
            "last_text_excerpt": (state or {}).get("last_text_excerpt") or "",
            "final_plan_path": final_plan_path,
            "final_plan": final_plan_text,
            "history": history,
        })

    # ── POST /api/projects/<slug>/plan/finalize ───────────────────
    def handle_plan_finalize(self, slug: str):
        if validate_slug(slug):
            self.send_json({"error": "invalid_slug"}, 400)
            return
        adapter, channel = self._resolve_planning_key(slug)
        try:
            from src.planning_session import get_planning_state, clear_planning_state  # type: ignore
            from src.planning_orchestrator import PlanningOrchestrator  # type: ignore
        except Exception as exc:
            self.send_json({"error": str(exc)}, 500)
            return

        state = get_planning_state(adapter, channel)
        final_plan = None
        if state and state.get("final_plan_path"):
            final_plan = state["final_plan_path"]
        else:
            final_plan = str(PlanningOrchestrator.final_plan_path(slug))

        def _mut(data: dict) -> dict:
            proj = _find_project(data, slug)
            if proj is None:
                raise KeyError(slug)
            proj["status"] = "approved"
            proj["approved_at"] = _now_iso()
            proj["planning_session_id"] = None
            proj["final_plan_path"] = final_plan
            _bump_version(data)
            return data

        try:
            _write_approved(_mut)
        except KeyError:
            self.send_json({"error": "not_found", "slug": slug}, 404)
            return
        except Exception as exc:
            log.exception("plan/finalize mutate failed")
            self.send_json({"error": str(exc)}, 500)
            return

        clear_planning_state(adapter, channel)
        self.send_json({
            "ok": True,
            "slug": slug,
            "status": "approved",
            "final_plan_path": final_plan,
        })

    # ── POST /api/projects/<slug>/plan/cancel ─────────────────────
    def handle_plan_cancel_planning(self, slug: str):
        if validate_slug(slug):
            self.send_json({"error": "invalid_slug"}, 400)
            return
        adapter, channel = self._resolve_planning_key(slug)
        try:
            from src.planning_orchestrator import PlanningOrchestrator  # type: ignore
        except Exception as exc:
            self.send_json({"error": str(exc)}, 500)
            return

        cleared = PlanningOrchestrator.cancel(adapter, channel)
        # Revert status to pending if currently planning.
        def _mut(data: dict) -> dict:
            proj = _find_project(data, slug)
            if proj is not None and (proj.get("status") or "").lower() == "planning":
                proj["status"] = "pending"
                proj["planning_session_id"] = None
                _bump_version(data)
            return data

        try:
            _write_approved(_mut)
        except Exception:
            pass
        self.send_json({"ok": True, "slug": slug, "cleared": cleared, "status": "pending"})

    # ── POST /api/projects/<slug>/plan/advance ────────────────────
    def handle_plan_advance(self, slug: str):
        if validate_slug(slug):
            self.send_json({"error": "invalid_slug"}, 400)
            return
        adapter, channel = self._resolve_planning_key(slug)
        try:
            from src.planning_orchestrator import PlanningOrchestrator  # type: ignore
            session, text, completed = PlanningOrchestrator.advance(adapter, channel)
        except Exception as exc:
            log.exception("plan/advance failed for %s", slug)
            self.send_json({"error": str(exc)}, 500)
            return
        if session is None:
            self.send_json({"error": "no_active_session", "message": text}, 404)
            return
        self.send_json({
            "ok": True,
            "slug": slug,
            "phase": session.phase,
            "completed": completed,
            "message": text,
        })