"""API v1 — suprafata gateway (schelet).

Endpointuri din plan.md sect. 4. In schelet:
  - POST /v1/prezentari: enqueue cu idempotenta (dedup pe idempotency_key UNIQUE).
  - GET  /v1/prezentari, /v1/prezentari/{id}: monitorizare coada.
  - GET  /v1/nomenclator: cache local.
  - GET  /v1/mapari: listare mapari cont.
Validarea completa (T3), maparea op->cod, auth API-key, redactarea creds in
middleware (CORE) si exportul CSV vin ulterior — marcate TODO unde lipsesc.
"""

from __future__ import annotations

import csv
import io
import json

from fastapi import APIRouter, Depends, HTTPException
from fastapi.responses import StreamingResponse
from pydantic import BaseModel, Field

from ...auth import resolve_account_id
from ...crypto import encrypt_creds
from ...db import get_connection
from ...idempotency import build_key, canonicalize_row, idempotency_key
from ...mapping import (
    account_or_default,
    load_mapping,
    pending_unmapped,
    reresolve_account,
    resolve_prestatii,
    save_mapping,
)
from ...models import PrezentareRequest, PrezentariResponse, SubmissionResult
from ...validation import validate_prezentare

router = APIRouter(prefix="/v1", tags=["v1"])


@router.post("/prezentari", response_model=PrezentariResponse)
def create_prezentari(
    req: PrezentareRequest,
    account_id: int = Depends(resolve_account_id),
) -> PrezentariResponse:
    """Enqueue una/mai multe prezentari. Idempotent: continut identic -> acelasi submission.

    Validarea de continut (T3, app.validation) ruleaza inainte de enqueue:
    esecurile NU resping cererea, ci enqueue-aza cu status `needs_data` + motiv
    (plan.md sect. 3). JSON malformat -> 422 din Pydantic (validare de shape).
    account_id vine din cheia API (resolve_account_id): cont real cu cheie,
    implicit id=1 in dev fara cheie, 401 fara cheie valida in prod.
    Nota: rar_credentials NU se persista (zero-storage) — worker-ul le va primi
          pe alt canal (T2); in schelet enqueue-ul doar stocheaza prezentarea.
    """
    acct = account_or_default(account_id)
    # Creds RAR efemere: criptate si lipite de fiecare submission nou pana la
    # primul login reusit pentru cont (worker le sterge atunci). Zero-storage at
    # rest — niciodata in clar in DB/loguri (plan sect. 5).
    creds_enc = encrypt_creds(req.rar_credentials.model_dump())
    conn = get_connection()
    results: list[SubmissionResult] = []
    try:
        mapping = load_mapping(conn, acct)
        for prez in req.prezentari:
            content = prez.model_dump()
            # T9/OV-2: canonicalize_row inaintea build_key (odometru strip ".0", VIN upper).
            # build_key aplica account_or_default(account_id) inainte de hash:
            # None si 1 colapseaza la aceeasi cheie (canal API + canal import).
            canon = canonicalize_row(content)
            key = build_key(account_id, canon)
            # Aplica normalizarea si in content (odometru canonicalizat inainte de validare, §3.4bis)
            content.update({
                "vin": canon["vin"],
                "nr_inmatriculare": canon["nr_inmatriculare"],
                "odometru_final": canon["odometru_final"],
            })
            existing = conn.execute(
                "SELECT id, status, id_prezentare FROM submissions WHERE idempotency_key=?",
                (key,),
            ).fetchone()
            if existing:
                results.append(
                    SubmissionResult(
                        submission_id=existing["id"],
                        status=existing["status"],
                        id_prezentare=existing["id_prezentare"],
                        deduped=True,
                    )
                )
                continue

            # Mapare op->cod RAR (hibrid): codul RAR direct trece neatins; codul
            # intern ROAAUTO se traduce. Op nemapata -> needs_mapping (nu se trimite),
            # apare in editorul web. Codul rezolvat se scrie inapoi in payload, deci
            # validarea T3 + payload builder + worker raman code-driven.
            resolved, unmapped = resolve_prestatii(content.get("prestatii"), mapping)
            content["prestatii"] = resolved

            if unmapped:
                status = "needs_mapping"
                rar_error = json.dumps({"unmapped": unmapped}, ensure_ascii=False)
            else:
                # T3: validare de continut -> queued daca e curat, altfel needs_data + motiv.
                errors = validate_prezentare(content)
                if errors:
                    status, rar_error = "needs_data", json.dumps(errors, ensure_ascii=False)
                else:
                    status, rar_error = "queued", None

            cur = conn.execute(
                "INSERT INTO submissions (idempotency_key, account_id, status, payload_json, rar_error, rar_creds_enc) "
                "VALUES (?, ?, ?, ?, ?, ?)",
                (key, acct, status, json.dumps(content, ensure_ascii=False), rar_error, creds_enc),
            )
            results.append(SubmissionResult(submission_id=int(cur.lastrowid), status=status))
    finally:
        conn.close()
    return PrezentariResponse(results=results)


@router.get("/prezentari")
def list_prezentari(status: str | None = None, limit: int = 100) -> dict:
    conn = get_connection()
    try:
        if status:
            rows = conn.execute(
                "SELECT id, status, id_prezentare, rar_status_code, retry_count, created_at, updated_at "
                "FROM submissions WHERE status=? ORDER BY id DESC LIMIT ?",
                (status, limit),
            ).fetchall()
        else:
            rows = conn.execute(
                "SELECT id, status, id_prezentare, rar_status_code, retry_count, created_at, updated_at "
                "FROM submissions ORDER BY id DESC LIMIT ?",
                (limit,),
            ).fetchall()
        return {"submissions": [dict(r) for r in rows]}
    finally:
        conn.close()


@router.get("/prezentari/{submission_id}")
def get_prezentare(submission_id: int) -> dict:
    conn = get_connection()
    try:
        row = conn.execute("SELECT * FROM submissions WHERE id=?", (submission_id,)).fetchone()
        if not row:
            raise HTTPException(status_code=404, detail="submission inexistent")
        out = dict(row)
        out.pop("payload_json", None)  # nu expunem payload-ul brut (PII) in listare
        return out
    finally:
        conn.close()


@router.get("/nomenclator")
def get_nomenclator() -> dict:
    conn = get_connection()
    try:
        rows = conn.execute(
            "SELECT cod_prestatie, nume_prestatie, updated_at FROM nomenclator_rar ORDER BY cod_prestatie"
        ).fetchall()
        return {"nomenclator": [dict(r) for r in rows]}
    finally:
        conn.close()


AUDIT_COLUMNS = [
    "submission_id",
    "status",
    "id_prezentare",
    "account_id",
    "vin",
    "nr_inmatriculare",
    "data_prestatie",
    "odometru_final",
    "prestatii",
    "rar_status_code",
    "created_at",
    "updated_at",
    "purge_after",
]


def _audit_rows(conn, date_from: str | None, date_to: str | None, status: str):
    """Randuri audit (sent implicit) filtrate pe data(updated_at) in [from, to].

    payload_json e text in schelet (criptarea PII e P2); citim campurile-cheie
    pentru audit. b64_image NU intra in CSV (mare). Daca P2 cripteaza payload-ul,
    aici se decripteaza inainte de a construi randul.
    """
    sql = "SELECT id, status, id_prezentare, account_id, payload_json, rar_status_code, created_at, updated_at, purge_after FROM submissions"
    where = []
    params: list = []
    if status != "all":
        where.append("status=?")
        params.append(status)
    if date_from:
        where.append("date(updated_at) >= date(?)")
        params.append(date_from)
    if date_to:
        where.append("date(updated_at) <= date(?)")
        params.append(date_to)
    if where:
        sql += " WHERE " + " AND ".join(where)
    sql += " ORDER BY id"

    for r in conn.execute(sql, params).fetchall():
        try:
            p = json.loads(r["payload_json"]) if r["payload_json"] else {}
        except (ValueError, TypeError):
            p = {}
        codes = ",".join(
            (it.get("cod_prestatie") or it.get("cod_op_service") or "")
            for it in (p.get("prestatii") or [])
            if isinstance(it, dict)
        )
        yield {
            "submission_id": r["id"],
            "status": r["status"],
            "id_prezentare": r["id_prezentare"] or "",
            "account_id": r["account_id"] or "",
            "vin": p.get("vin") or "",
            "nr_inmatriculare": p.get("nr_inmatriculare") or "",
            "data_prestatie": p.get("data_prestatie") or "",
            "odometru_final": p.get("odometru_final") or "",
            "prestatii": codes,
            "rar_status_code": r["rar_status_code"] or "",
            "created_at": r["created_at"],
            "updated_at": r["updated_at"],
            "purge_after": r["purge_after"] or "",
        }


@router.get("/audit/export")
def audit_export(
    date_from: str | None = None,
    date_to: str | None = None,
    status: str = "sent",
) -> StreamingResponse:
    """CSV cu ce s-a trimis (audit). Filtre optionale `date_from`/`date_to` (YYYY-MM-DD)

    pe data(updated_at). `status` implicit `sent` (ce a ajuns efectiv la RAR);
    `status=all` exporta toata coada. Leaga re_tinerea 90 zile prin coloana
    `purge_after` (plan.md sect. 4 + 8). b64_image nu se exporta.
    """
    conn = get_connection()
    try:
        buf = io.StringIO()
        writer = csv.DictWriter(buf, fieldnames=AUDIT_COLUMNS)
        writer.writeheader()
        for row in _audit_rows(conn, date_from, date_to, status):
            writer.writerow(row)
        data = buf.getvalue()
    finally:
        conn.close()

    fname = f"audit_{status}_{date_from or 'inceput'}_{date_to or 'azi'}.csv"
    return StreamingResponse(
        iter([data]),
        media_type="text/csv",
        headers={"Content-Disposition": f'attachment; filename="{fname}"'},
    )


@router.get("/mapari")
def get_mapari(account_id: int | None = None) -> dict:
    conn = get_connection()
    try:
        if account_id is not None:
            rows = conn.execute(
                "SELECT * FROM operations_mapping WHERE account_id=? ORDER BY cod_op_service",
                (account_id,),
            ).fetchall()
        else:
            rows = conn.execute("SELECT * FROM operations_mapping ORDER BY account_id, cod_op_service").fetchall()
        return {"mapari": [dict(r) for r in rows]}
    finally:
        conn.close()


@router.get("/mapari/pending")
def get_mapari_pending() -> dict:
    """Operatii ROAAUTO nemapate (din submission-uri needs_mapping) + sugestii fuzzy.

    Alimenteaza editorul web. Fiecare intrare: {account_id, cod_op_service, denumire,
    blocked, suggestions:[{cod_prestatie, nume_prestatie, score}]}.
    """
    conn = get_connection()
    try:
        return {"pending": pending_unmapped(conn)}
    finally:
        conn.close()


class MapareIn(BaseModel):
    cod_op_service: str = Field(..., min_length=1)
    cod_prestatie: str = Field(..., min_length=1)
    auto_send: bool = True


@router.post("/mapari")
def create_mapare(
    req: MapareIn,
    account_id: int = Depends(resolve_account_id),
) -> dict:
    """Salveaza/actualizeaza o mapare op->cod si re-rezolva submission-urile blocate.

    Contul vine din cheia API (NU din body) — un cont nu poate edita maparile
    altuia. Verifica intai ca `cod_prestatie` exista in nomenclator (nu lasam
    mapari catre coduri inexistente). Apoi upsert + re-rezolvare `needs_mapping`.
    """
    conn = get_connection()
    try:
        cod = req.cod_prestatie.strip().upper()
        exists = conn.execute(
            "SELECT 1 FROM nomenclator_rar WHERE cod_prestatie=?", (cod,)
        ).fetchone()
        if not exists:
            raise HTTPException(status_code=422, detail=f"cod_prestatie '{cod}' nu exista in nomenclator")
        save_mapping(conn, account_id, req.cod_op_service, cod, req.auto_send)
        stats = reresolve_account(conn, account_id)
        return {"saved": {"cod_op_service": req.cod_op_service.strip(), "cod_prestatie": cod}, "reresolve": stats}
    finally:
        conn.close()