"""Teste US-005 (PRD 5.15): obs editabil + concat operatie la import.

AC-uri:
  - obs adaugat in bucla de campuri din post_corecteaza (routes.py) si in EDIT_FIELDS
    (import_router.py); corecteaza si editeaza preview accepta si persista obs.
  - obs optional (text liber, fara validare de continut, doar .strip()).
  - obs apare in prezentare_din_payload (payload_view.py).
  - obs EXCLUS din cheia de idempotenta (D8): editarea obs NU schimba cheia.
  - La import fara coloana obs: denumirea operatiei se COPIAZA in obs (D7).
  - Derive-on-empty idempotent: re-preview NU dubleaza obs (E3).

TDD: toate testele se scriu INAINTE de implementare (RED -> GREEN).
"""

from __future__ import annotations

import io
import json
import os
import re
import tempfile

import pytest
from starlette.testclient import TestClient


# --------------------------------------------------------------------------- #
# Fixtures                                                                     #
# --------------------------------------------------------------------------- #

@pytest.fixture()
def client(monkeypatch):
    """Client web cu autentificare activa (pentru corecteaza)."""
    tmp = tempfile.mkdtemp()
    monkeypatch.setenv("AUTOPASS_DB_PATH", os.path.join(tmp, "obs.db"))
    monkeypatch.setenv("AUTOPASS_WEB_AUTH_REQUIRED", "true")
    from app.config import get_settings
    get_settings.cache_clear()
    from app.web import ratelimit
    ratelimit._hits.clear()
    from app.main import app
    with TestClient(app, follow_redirects=False) as c:
        yield c
    ratelimit._hits.clear()
    get_settings.cache_clear()


@pytest.fixture()
def api_client(monkeypatch):
    """Client API fara autentificare web (pentru import preview + editeaza)."""
    tmp = tempfile.mkdtemp()
    monkeypatch.setenv("AUTOPASS_DB_PATH", os.path.join(tmp, "obs_api.db"))
    monkeypatch.setenv("AUTOPASS_WEB_AUTH_REQUIRED", "false")
    from app.config import get_settings
    get_settings.cache_clear()
    from app.crypto import reset_cache
    reset_cache()
    from app.main import app
    with TestClient(app) as c:
        yield c
    get_settings.cache_clear()
    reset_cache()


# --------------------------------------------------------------------------- #
# Helpere                                                                      #
# --------------------------------------------------------------------------- #

def _create_account_user(email: str, password: str = "parolasecreta10"):
    from app.accounts import create_account
    from app.users import create_user
    from app.db import get_connection
    conn = get_connection()
    try:
        acct_id = create_account(conn, "Service", active=True)
        create_user(conn, acct_id, email, password)
        return acct_id
    finally:
        conn.close()


def _login(client, email: str, password: str = "parolasecreta10") -> None:
    resp = client.get("/login")
    m = re.search(r'name="csrf_token"\s+value="([^"]+)"', resp.text) or \
        re.search(r'value="([^"]+)"\s+name="csrf_token"', resp.text)
    assert m, "csrf_token nu a fost gasit in pagina de login"
    resp = client.post("/login", data={"email": email, "parola": password, "csrf_token": m.group(1)})
    assert resp.status_code == 303, f"Login esuat: {resp.status_code}"


def _csrf(client) -> str:
    resp = client.get("/?tab=coada")
    m = re.search(r'name="csrf_token"\s+value="([^"]+)"', resp.text)
    assert m, "csrf_token nu a fost gasit in dashboard"
    return m.group(1)


def _insert(acct: int, *, status: str, payload: dict, key: str | None = None) -> int:
    from app.db import get_connection
    conn = get_connection()
    try:
        k = key or f"k-{os.urandom(6).hex()}"
        cur = conn.execute(
            "INSERT INTO submissions (idempotency_key, account_id, status, payload_json) "
            "VALUES (?, ?, ?, ?)",
            (k, acct, status, json.dumps(payload)),
        )
        conn.commit()
        return int(cur.lastrowid)
    finally:
        conn.close()


def _row_payload(sid: int) -> dict:
    from app.db import get_connection
    conn = get_connection()
    try:
        r = conn.execute("SELECT payload_json FROM submissions WHERE id=?", (sid,)).fetchone()
        return json.loads(r["payload_json"])
    finally:
        conn.close()


def _row_status(sid: int) -> str:
    from app.db import get_connection
    conn = get_connection()
    try:
        r = conn.execute("SELECT status FROM submissions WHERE id=?", (sid,)).fetchone()
        return r["status"]
    finally:
        conn.close()


def _seed_nomenclator(cod: str = "OE-1", op_service: str = "Schimb ulei") -> None:
    """Insereaza cod in nomenclator si mapare op_service -> cod pentru contul 1."""
    from app.db import get_connection
    conn = get_connection()
    try:
        conn.execute(
            "INSERT OR REPLACE INTO nomenclator_rar (cod_prestatie, nume_prestatie) VALUES (?, ?)",
            (cod, "Schimb ulei motor"),
        )
        conn.execute(
            "INSERT OR IGNORE INTO operations_mapping "
            "(account_id, cod_op_service, cod_prestatie, auto_send) "
            "VALUES (1, ?, ?, 1)",
            (op_service, cod),
        )
        conn.commit()
    finally:
        conn.close()


def _csv_bytes(rows: list[dict], sep: str = ";") -> bytes:
    import csv as _csv
    buf = io.StringIO()
    writer = _csv.DictWriter(buf, fieldnames=list(rows[0].keys()), delimiter=sep)
    writer.writeheader()
    writer.writerows(rows)
    return buf.getvalue().encode("utf-8")


def _upload(client, data: bytes, filename: str = "test.csv") -> int:
    r = client.post(
        "/v1/import",
        files={"file": (filename, io.BytesIO(data), "text/csv")},
    )
    assert r.status_code == 200, r.text
    return int(r.json()["import_id"])


def _save_mapping(client, import_id: int, json_mapare: dict) -> None:
    r = client.post(
        f"/v1/import/{import_id}/column-mapping",
        json={"json_mapare": json_mapare, "format_data": "YYYY-MM-DD"},
    )
    assert r.status_code == 200, r.text


def _preview(client, import_id: int) -> list[dict]:
    r = client.get(f"/v1/import/{import_id}/preview")
    assert r.status_code == 200, r.text
    return r.json()["rows"]


# --------------------------------------------------------------------------- #
# Teste                                                                        #
# --------------------------------------------------------------------------- #

def test_obs_editabil_persistat_corecteaza(client):
    """AC: obs adaugat in bucla post_corecteaza -> persists in payload_json.

    RED: 'obs' nu e inca in bucla de campuri din post_corecteaza (routes.py:1177).
    """
    acct = _create_account_user("obs.corecteaza@test.com")
    _login(client, "obs.corecteaza@test.com")

    # Submission needs_data cu odometru gol (trigger pentru blocaj)
    sid = _insert(acct, status="needs_data", payload={
        "vin": "WVWZZZ1JZXW0AB001",
        "nr_inmatriculare": "B100AAA",
        "data_prestatie": "2026-06-10",
        "odometru_final": "",       # trigger needs_data
        "prestatii": [{"cod_prestatie": "OE-1"}],
    })
    csrf = _csrf(client)

    resp = client.post(
        f"/trimitere/{sid}/corecteaza",
        data={
            "csrf_token": csrf,
            "odometru_final": "50000",          # fix odo
            "obs": "Schimb ulei verificat",     # obs editabil
        },
    )
    assert resp.status_code == 200, (
        f"Status neasteptat: {resp.status_code}\n{resp.text[:500]}"
    )

    payload = _row_payload(sid)
    assert payload.get("obs") == "Schimb ulei verificat", (
        f"obs nu e persistat in payload_json; payload={payload}"
    )
    assert _row_status(sid) == "queued", (
        f"status neasteptat: {_row_status(sid)}"
    )


def test_obs_persistat_preview_editeaza(api_client):
    """AC: obs in EDIT_FIELDS + RandEditIn -> editeaza preview salveaza obs -> apare in resolved.

    RED: 'obs' nu e in RandEditIn (import_router.py:1188) sau in EDIT_FIELDS (:261).
    """
    _seed_nomenclator()
    data = _csv_bytes([{
        "VIN": "WVWZZZ1JZXW0AB002",
        "Nr": "B200BBB",
        "Data": "2026-06-10",
        "KM": "50000",
        "Operatie": "Schimb ulei",
        # Fara coloana Observatii: obs vine din derive
    }])
    iid = _upload(api_client, data)
    _save_mapping(api_client, iid, {
        "VIN": "vin",
        "Nr": "nr_inmatriculare",
        "Data": "data_prestatie",
        "KM": "odometru_final",
        "Operatie": "operatie",
    })
    rows = _preview(api_client, iid)
    assert rows[0]["resolved_status"] == "ok", f"Stare neasteptata inainte de edit: {rows[0]}"

    # Editeaza obs explicit pe randul 0
    r = api_client.post(
        f"/v1/import/{iid}/rand/0/editeaza",
        json={"obs": "Observatie test manuala"},
    )
    assert r.status_code == 200, r.text
    body = r.json()
    assert body.get("override", {}).get("obs") == "Observatie test manuala", (
        f"obs nu e in override returnat: {body}"
    )

    # Preview dupa editare: obs din override trebuie sa apara in resolved
    rows2 = _preview(api_client, iid)
    resolved_obs = rows2[0]["resolved"].get("obs")
    assert resolved_obs == "Observatie test manuala", (
        f"obs nu apare in resolved dupa editeaza; resolved={rows2[0]['resolved']}"
    )


def test_obs_optional_gol_ok(client):
    """AC: obs optional; o trimitere fara obs trece validarea si devine queued.

    RED: implicit nu esueaza, dar ne asiguram ca lipsa obs nu introduce o eroare.
    """
    acct = _create_account_user("obs.gol@test.com")
    _login(client, "obs.gol@test.com")

    sid = _insert(acct, status="needs_data", payload={
        "vin": "WVWZZZ1JZXW0AB006",
        "nr_inmatriculare": "B600FFF",
        "data_prestatie": "2026-06-10",
        "odometru_final": "",           # trigger needs_data
        "prestatii": [{"cod_prestatie": "OE-1"}],
    })
    csrf = _csrf(client)

    # Corecteaza FARA obs in form (obs absent)
    resp = client.post(
        f"/trimitere/{sid}/corecteaza",
        data={
            "csrf_token": csrf,
            "odometru_final": "50000",
            # obs absent din form
        },
    )
    assert resp.status_code == 200, resp.text
    assert _row_status(sid) == "queued", (
        f"Status neasteptat dupa corectie fara obs: {_row_status(sid)}"
    )


def test_import_concateneaza_operatie_in_obs(api_client):
    """AC (D7): import fara coloana obs -> obs = denumire operatie in preview.

    RED: obs nu e derivat din operatie la import (inca nu e implementat in
    _resolve_row_for_preview).
    """
    _seed_nomenclator(cod="OE-1", op_service="Schimb ulei")
    data = _csv_bytes([{
        "VIN": "WVWZZZ1JZXW0AB003",
        "Nr": "B300CCC",
        "Data": "2026-06-10",
        "KM": "50000",
        "Operatie": "Schimb ulei",
        # Fara coloana Observatii in fisier
    }])
    iid = _upload(api_client, data)
    _save_mapping(api_client, iid, {
        "VIN": "vin",
        "Nr": "nr_inmatriculare",
        "Data": "data_prestatie",
        "KM": "odometru_final",
        "Operatie": "operatie",
        # "Observatii" nu e in mapare -> obs vine din derive
    })

    rows = _preview(api_client, iid)
    resolved = rows[0]["resolved"]
    obs = resolved.get("obs", "")
    assert obs == "Schimb ulei", (
        f"obs trebuie sa fie 'Schimb ulei' (copiat din operatie); got={obs!r}"
    )


def test_anti_dublu_concat(api_client):
    """AC (E3): DERIVE-ON-EMPTY idempotent; re-preview si override explicit NU dubleaza obs.

    RED: fara DERIVE-ON-EMPTY, un al doilea preview sau o editare cu obs setat ar putea
    produce 'Schimb ulei; Schimb ulei'.
    """
    _seed_nomenclator(cod="OE-1", op_service="Schimb ulei")
    data = _csv_bytes([{
        "VIN": "WVWZZZ1JZXW0AB004",
        "Nr": "B400DDD",
        "Data": "2026-06-10",
        "KM": "50000",
        "Operatie": "Schimb ulei",
    }])
    iid = _upload(api_client, data)
    _save_mapping(api_client, iid, {
        "VIN": "vin",
        "Nr": "nr_inmatriculare",
        "Data": "data_prestatie",
        "KM": "odometru_final",
        "Operatie": "operatie",
    })

    # Primul preview: obs derivat din operatie
    rows1 = _preview(api_client, iid)
    obs1 = rows1[0]["resolved"].get("obs", "")
    assert obs1 == "Schimb ulei", f"Primul preview: obs neasteptat: {obs1!r}"

    # Simulam utilizatorul care seteaza explicit obs = valoarea deja derivata
    r = api_client.post(
        f"/v1/import/{iid}/rand/0/editeaza",
        json={"obs": "Schimb ulei"},
    )
    assert r.status_code == 200, r.text

    # Al doilea preview: obs NU trebuie dublat
    rows2 = _preview(api_client, iid)
    obs2 = rows2[0]["resolved"].get("obs", "")
    assert obs2 == "Schimb ulei", (
        f"Al doilea preview a produs obs gresit: {obs2!r} (asteptat: 'Schimb ulei')"
    )
    assert "Schimb ulei; Schimb ulei" not in obs2, (
        f"obs a fost dublat: {obs2!r}"
    )

    # Al treilea preview (fara nicio alta editare): inca nu se dubleaza
    rows3 = _preview(api_client, iid)
    obs3 = rows3[0]["resolved"].get("obs", "")
    assert obs3 == "Schimb ulei", (
        f"Al treilea preview a produs obs gresit: {obs3!r}"
    )


def test_obs_sters_explicit_nu_se_re_deriveaza(api_client):
    """Bug fix (code-review 5.15): obs='' (sters explicit de user) NU se re-deriveaza.

    obs e camp derivat (copiaza denumirea operatiei cand e gol). Cand userul sterge
    obs in preview (obs=''), _merge_override pastreaza acum obs='' in override (nu il
    mai face pop) -> override aplicat ultimul suprascrie derive-on-empty -> obs ramane
    gol. Inainte: pop -> obs gol -> re-derivat din denumire -> stergerea ignorata.

    RED inainte de fix: al doilea preview re-deriveaza obs = 'Schimb ulei'.
    """
    _seed_nomenclator(cod="OE-1", op_service="Schimb ulei")
    data = _csv_bytes([{
        "VIN": "WVWZZZ1JZXW0AB009",
        "Nr": "B900GGG",
        "Data": "2026-06-10",
        "KM": "50000",
        "Operatie": "Schimb ulei",
    }])
    iid = _upload(api_client, data)
    _save_mapping(api_client, iid, {
        "VIN": "vin",
        "Nr": "nr_inmatriculare",
        "Data": "data_prestatie",
        "KM": "odometru_final",
        "Operatie": "operatie",
    })

    # Primul preview: obs derivat din operatie.
    rows1 = _preview(api_client, iid)
    assert rows1[0]["resolved"].get("obs") == "Schimb ulei"

    # Userul STERGE obs (string gol).
    r = api_client.post(
        f"/v1/import/{iid}/rand/0/editeaza",
        json={"obs": ""},
    )
    assert r.status_code == 200, r.text

    # Preview dupa stergere: obs trebuie sa RAMANA gol (NU re-derivat).
    rows2 = _preview(api_client, iid)
    obs2 = rows2[0]["resolved"].get("obs", "")
    assert obs2 == "", (
        f"obs sters explicit a fost re-derivat: {obs2!r} (asteptat gol)"
    )

    # Idempotent: al treilea preview tot gol.
    rows3 = _preview(api_client, iid)
    assert rows3[0]["resolved"].get("obs", "") == "", (
        f"obs sters re-derivat la al treilea preview: {rows3[0]['resolved'].get('obs')!r}"
    )


def test_obs_nu_schimba_cheia_idempotenta():
    """AC (D8): editarea obs NU schimba cheia de idempotenta.

    Fara import circular DB; testeaza direct functiile din idempotency.py.
    RED: daca obs ar fi in build_key, doua versiuni (cu/fara obs) ar produce chei diferite.
    """
    from app.idempotency import build_key, canonicalize_row

    payload_fara_obs = {
        "vin": "WVWZZZ1JZXW0AB005",
        "nr_inmatriculare": "B500EEE",
        "data_prestatie": "2026-06-10",
        "odometru_final": "50000",
        "prestatii": [{"cod_prestatie": "OE-1"}],
    }
    payload_cu_obs = {
        **payload_fara_obs,
        "obs": "Schimb ulei motor 5W30 adaugat dupa",
    }

    canon1 = canonicalize_row(payload_fara_obs)
    canon2 = canonicalize_row(payload_cu_obs)
    key1 = build_key(1, canon1)
    key2 = build_key(1, canon2)

    assert key1 == key2, (
        f"obs a schimbat neasteptat cheia de idempotenta!\n"
        f"  fara obs: {key1}\n"
        f"  cu obs:   {key2}"
    )