"""D 예정노선 확정 · 업체 지정 API (요구 345 · PLAN 531-1 · 531-2).

- `GET  /api/projects/{id}/plan/assignees` — 연도별 지정 업체(지정 회사 = 자기 행만)
- `PUT  /api/projects/{id}/plan/assignees` — 연도별 지정 업체 저장(등록 회사 또는 업체명 + 메일)
- `POST /api/projects/{id}/plan/finalize` — 연도 노선 확정 → 업체별 zip → 메일 첨부 → 발송 시각
- `GET  /api/projects/{id}/plan/summary` — D04 화면 연도 요약(지정 회사 = 자기 연도 · 자기 행만)
- `GET  /api/projects/{id}/plan/export` — [내보내기] zip(산림청 = 전 연도 + 전체 · 공유 = 자기 연도)

지정 · 확정은 산림청(시스템 관리자 또는 메일 *.go.kr)만. 지정받은 회사는 공용 접근 판정이
GET 만 통과시킴. 계산 자리 ③ 서버 단독 — 내보내기 파일은 저장된 `route_json` 으로만 만듦.
"""

from __future__ import annotations

import asyncio
import io
import logging
import zipfile
from typing import Any
from urllib.parse import quote
from uuid import UUID

from fastapi import APIRouter, Depends, HTTPException
from fastapi.responses import Response
from pydantic import BaseModel

from common_util.common_util_auth import is_forest_service, verify_session
from common_util.common_util_crs import tm_to_lonlat
from D04_PlanConfirm import D04_PlanConfirm_Repository as repo
from D04_PlanConfirm.D04_PlanConfirm_Email import build_completion_mail, send_completion_mail
from D04_PlanConfirm.D04_PlanConfirm_Export import (
    MIME_ZIP,
    YearRoute,
    build_export,
    company_zip,
    safe_name,
)

logger = logging.getLogger(__name__)
router = APIRouter(prefix="/api/projects", tags=["D04 Plan Confirm"])


class AssigneeIn(BaseModel):
    year: int
    company_id: int | None = None  # 등록 회사 — 없으면 수기 업체
    company_name: str | None = None
    email: str | None = None


class AssigneesRequest(BaseModel):
    assignees: list[AssigneeIn]
    years: list[int] | None = None  # 맞출 연도(업체를 다 뺀 연도도) — 비우면 보낸 업체의 연도


class FinalizeRequest(BaseModel):
    years: list[int] | None = None  # 비우면 분석이 저장된 모든 연도
    resend: bool = False  # 이미 메일을 보낸 업체에도 다시 보냄


def _require_forest(session: dict[str, Any]) -> None:
    if not is_forest_service(session):
        raise HTTPException(
            status_code=403, detail="산림청만 예정노선을 확정 · 지정할 수 있습니다."
        )


def _key(row: dict[str, Any]) -> tuple:
    """같은 업체 판정 — 등록 회사는 id · 수기 업체는 메일(대소문자 무시)."""
    if row.get("company_id") is not None:
        return (row["year"], "c", row["company_id"])
    return (row["year"], "e", (row.get("email") or "").strip().lower())


def plan_assignee_changes(
    existing: list[dict[str, Any]], wanted: list[dict[str, Any]], years: set[int]
) -> tuple[list[int], list[dict], list[dict]]:
    """보낸 연도(`years`)만 맞춰 바꿈 — (지울 id, 고칠 행, 넣을 행).

    같은 업체는 행을 살려 두어 발송 시각 · 연결한 프로젝트가 남는다.
    """
    old = {_key(row): row for row in existing if row["year"] in years}
    new = {_key(row): row for row in wanted}
    delete_ids = [row["id"] for key, row in old.items() if key not in new]
    updates = [{**row, "id": old[key]["id"]} for key, row in new.items() if key in old]
    inserts = [row for key, row in new.items() if key not in old]
    return delete_ids, updates, inserts


async def _resolve_assignee(item: AssigneeIn) -> dict[str, Any]:
    """등록 회사면 이름 · 대표 메일을 DB 에서, 수기면 이름 + 메일을 검사."""
    email = (item.email or "").strip()
    name = (item.company_name or "").strip()
    if item.company_id is not None:
        company = await repo.get_company_contact(item.company_id)
        if not company:
            raise HTTPException(
                status_code=400, detail=f"등록 회사를 찾을 수 없습니다: {item.company_id}"
            )
        return {
            "year": item.year,
            "company_id": item.company_id,
            "company_name": company["name"],
            "email": email or company.get("email") or None,
        }
    if not name or "@" not in email:
        raise HTTPException(status_code=400, detail="업체명과 메일 주소가 필요합니다.")
    return {"year": item.year, "company_id": None, "company_name": name, "email": email}


async def _plan_project(project_id: UUID) -> dict[str, Any]:
    project = await repo.get_plan_project(str(project_id))
    if not project:
        raise HTTPException(status_code=404, detail="프로젝트를 찾을 수 없습니다.")
    if project["project_kind"] != "PLAN":
        raise HTTPException(status_code=400, detail="예정노선 프로젝트가 아닙니다.")
    return project


def visible_to(
    session: dict[str, Any], years: list[dict[str, Any]], assignees: list[dict[str, Any]]
) -> tuple[list[dict[str, Any]], list[dict[str, Any]]]:
    """산림청 = 전부 · 지정 회사 = 자기 회사가 지정된 연도 줄 · 자기 업체 행만(남의 이름 · 메일 뺌)."""
    if is_forest_service(session):
        return years, assignees
    company = session.get("company_id")
    mine = [a for a in assignees if a["company_id"] is not None and a["company_id"] == company]
    own_years = {a["year"] for a in mine}
    return [y for y in years if y["year"] in own_years], mine


@router.get("/{project_id}/plan/assignees", response_model=None)
async def get_plan_assignees(
    project_id: UUID, session: dict = Depends(verify_session)
) -> dict[str, Any]:
    await _plan_project(project_id)
    _, assignees = visible_to(session, [], await repo.list_assignees(str(project_id)))
    return {"status": "success", "assignees": assignees}


@router.put("/{project_id}/plan/assignees", response_model=None)
async def put_plan_assignees(
    project_id: UUID, request: AssigneesRequest, session: dict = Depends(verify_session)
) -> dict[str, Any]:
    """보낸 연도의 지정 업체를 그대로 맞춤 — 연도를 안 보낸 곳은 건드리지 않음."""
    _require_forest(session)
    await _plan_project(project_id)
    known = {row["year"] for row in await repo.list_year_routes(str(project_id))}
    years = {a.year for a in request.assignees} | set(request.years or [])
    unknown = sorted(years - known)
    if unknown:
        raise HTTPException(status_code=400, detail=f"예정노선 연도가 아닙니다: {unknown}")
    wanted = [await _resolve_assignee(item) for item in request.assignees]
    existing = await repo.list_assignees(str(project_id))
    delete_ids, updates, inserts = plan_assignee_changes(existing, wanted, years)
    await repo.apply_assignee_changes(str(project_id), delete_ids, updates, inserts)
    return {"status": "success", "assignees": await repo.list_assignees(str(project_id))}


def year_routes_from_rows(rows: list[dict[str, Any]]) -> list[YearRoute]:
    """분석이 저장된 연도 → 내보내기 입력 (D03 `route_json["planned"]` = 프로젝트 좌표 꺾은선)."""
    routes = []
    for row in rows:
        body = row.get("route_json")
        if not body or not body.get("planned"):
            continue
        routes.append(
            YearRoute(
                year=int(row["year"]),
                points=[(p[0], p[1]) for p in body["planned"]],
                crs_epsg=int(row["epsg"]),
                start_station_m=body.get("start_chainage_m"),
                end_station_m=body.get("end_chainage_m"),
            )
        )
    return routes


def _result(assignee: dict[str, Any], state: str) -> dict[str, Any]:
    return {
        "year": assignee["year"],
        "company_name": assignee["company_name"],
        "email": assignee["email"],
        "state": state,
    }


@router.post("/{project_id}/plan/finalize", response_model=None)
async def finalize_plan(
    project_id: UUID, request: FinalizeRequest, session: dict = Depends(verify_session)
) -> dict[str, Any]:
    """연도 노선 확정 → 지정 업체마다 그 연도 zip 을 첨부해 메일 → 보낸 곳에 발송 시각."""
    _require_forest(session)
    project = await _plan_project(project_id)
    routes = year_routes_from_rows(await repo.list_year_routes(str(project_id)))
    saved = {r.year for r in routes}
    years = sorted(set(request.years) if request.years else saved)
    missing = [y for y in years if y not in saved]
    if not years or missing:
        raise HTTPException(
            status_code=409, detail=f"분석 [저장]이 안 된 연도입니다: {missing or '없음'}"
        )
    await repo.mark_confirmed(str(project_id), years)

    # 누가거리가 연도마다 이어지므로 저장된 전 연도로 한 번에 만들고, 보낼 때만 연도를 고름.
    first = float(project.get("route_start_m") or 0.0)
    bundle = await asyncio.to_thread(
        build_export, project["name"], project["region"] or "", routes, first
    )
    results = []
    for assignee in await repo.list_assignees(str(project_id)):
        year = assignee["year"]
        if year not in years:
            continue
        if assignee["notified_at"] and not request.resend:
            results.append(_result(assignee, "already_sent"))
            continue
        if not assignee["email"]:
            results.append(_result(assignee, "no_email"))
            continue
        zip_name, zip_bytes = company_zip(project["name"], year, bundle.by_year[year])
        subject, body = build_completion_mail(
            project_name=project["name"],
            region=project["region"],
            year=year,
            length_m=bundle.lengths_m[year],
            recipient=assignee["company_name"] or assignee["email"],
            attachment_names=[zip_name],
        )
        sent = await send_completion_mail(
            to_email=assignee["email"],
            subject=subject,
            body=body,
            attachments=[(zip_name, zip_bytes, MIME_ZIP)],
        )
        if sent:
            await repo.mark_notified(assignee["id"])
        results.append(_result(assignee, "sent" if sent else "failed"))
    return {"status": "success", "confirmed_years": years, "notifications": results}


def _end_point(point: list[float], epsg: int) -> dict[str, float]:
    lon, lat = tm_to_lonlat(float(point[0]), float(point[1]), epsg)
    return {"x": float(point[0]), "y": float(point[1]), "lon": lon, "lat": lat}


def year_summary(row: dict[str, Any]) -> dict[str, Any]:
    """연도 한 줄 — 분석 [저장]이 없으면 saved False 만."""
    body = row.get("route_json") or {}
    planned = body.get("planned") or []
    out = {"year": int(row["year"]), "saved": len(planned) >= 2, "confirmed_at": None}
    if row.get("confirmed_at"):
        out["confirmed_at"] = str(row["confirmed_at"])
    if out["saved"]:
        epsg = int(row["epsg"])
        out.update(
            length_m=body.get("length_m"),
            start_chainage_m=body.get("start_chainage_m"),
            end_chainage_m=body.get("end_chainage_m"),
            mode=body.get("mode"),
            start=_end_point(planned[0], epsg),
            end=_end_point(planned[-1], epsg),
        )
    return out


@router.get("/{project_id}/plan/summary", response_model=None)
async def get_plan_summary(
    project_id: UUID, session: dict = Depends(verify_session)
) -> dict[str, Any]:
    project = await _plan_project(project_id)
    rows = await repo.list_year_routes(str(project_id))
    years, assignees = visible_to(
        session, [year_summary(row) for row in rows], await repo.list_assignees(str(project_id))
    )
    return {"status": "success", "name": project["name"], "years": years, "assignees": assignees}


def export_zip(bundle: Any, years: list[int], with_all: bool) -> bytes:
    """연도마다 `<연도>/` · 전체는 `전체/` — 좌표표 이름이 연도마다 같아 폴더로 가름."""
    buffer = io.BytesIO()
    with zipfile.ZipFile(buffer, "w", zipfile.ZIP_DEFLATED) as archive:
        for year in years:
            for name, data in bundle.by_year[year].items():
                archive.writestr(f"{year}/{name}", data)
        if with_all:
            for name, data in bundle.all.items():
                archive.writestr(f"전체/{name}", data)
    return buffer.getvalue()


@router.get("/{project_id}/plan/export", response_model=None)
async def export_plan(project_id: UUID, session: dict = Depends(verify_session)) -> Response:
    """산림청 = 저장된 전 연도 + 전체 · 지정 회사 = 확정된 자기 연도만(전체 없음)."""
    project = await _plan_project(project_id)
    rows = await repo.list_year_routes(str(project_id))
    routes = year_routes_from_rows(rows)
    if not routes:
        raise HTTPException(status_code=409, detail="분석 [저장]이 된 연도가 없습니다.")
    forest = is_forest_service(session)
    if forest:
        years = [r.year for r in routes]
    else:
        confirmed = {int(r["year"]) for r in rows if r.get("confirmed_at")}
        mine = {
            a["year"]
            for a in await repo.list_assignees(str(project_id))
            if a["company_id"] is not None and a["company_id"] == session.get("company_id")
        }
        years = sorted({r.year for r in routes} & confirmed & mine)
        if not years:
            raise HTTPException(status_code=403, detail="받을 수 있는 연도가 없습니다.")
    first = float(project.get("route_start_m") or 0.0)
    bundle = await asyncio.to_thread(
        build_export, project["name"], project["region"] or "", routes, first
    )
    data = await asyncio.to_thread(export_zip, bundle, years, forest)
    name = f"{safe_name(project['name'])}_예정노선.zip"
    return Response(
        content=data,
        media_type=MIME_ZIP,
        headers={"Content-Disposition": f"attachment; filename*=UTF-8''{quote(name)}"},
    )