"""Quotes router — the dashboard ledger + full lifecycle.

⚠️ Route ordering: GET /quotes/stats is registered BEFORE /quotes/{quote_id}
(contract P0-38), otherwise FastAPI would capture "stats" as a UUID path.
"""
from datetime import datetime
from fastapi import APIRouter, Depends, Query
from sqlalchemy import exists, func, or_, select
from sqlalchemy.ext.asyncio import AsyncSession

from app.auth import UserContext, allow_quote_create, require_procurement_writer, require_role
from app.db.engine import get_db
from app.models.catalog import Material
from app.models.procurement import (
    ItemDecision,
    LineItem,
    LineItemProjects,
    Project,
    Quote,
    QuoteProjects,
    Supplier,
    Termsheet,
)
from app.schemas.procurement import (
    AcceptQuoteIn,
    ArriveItemsIn,
    QuoteChildrenReplaceIn,
    QuoteCreate,
    QuoteUpdate,
    RejectQuoteIn,
)
from app.services import quote_service
from app.services.expand_service import (
    decision_brief,
    parse_expand,
    serialize_quote,
    serialize_quote_with_children,
    serialize_quotes,
)
from app.utils.errors import ForbiddenError, NotFoundError, ValidationError
from app.utils.pagination import sort_query
from app.utils.security import get_actor

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

# عملیات نوشتنی تدارکات — فقط ادمین و مدیر تدارکات (مدیر پروژه فقط خواندن دارد)
_procurement_writer = require_procurement_writer()


# --- list filter helpers ---------------------------------------------------


def _quote_search(q: str) -> exists:
    like = f"%{q}%"
    return or_(
        Quote.notes.ilike(like),
        exists(select(1).where(Supplier.id == Quote.supplier_id, Supplier.name.ilike(like))),
        exists(select(1).where(Project.id == Quote.project_id, Project.name.ilike(like))),
        exists(
            select(1).where(
                LineItem.quote_id == Quote.id,
                Material.id == LineItem.material_id,
                Material.name.ilike(like),
            )
        ),
    )


# ---------------------------------------------------------------------------
# GET /quotes/stats — MUST be declared before GET /quotes/{quote_id}
# ---------------------------------------------------------------------------

@router.get("/stats")
async def get_quote_stats(
    supplier_id=None,
    project_id=None,
    quote_date_from: datetime | None = None,
    quote_date_to: datetime | None = None,
    db: AsyncSession = Depends(get_db),
):
    return {
        "data": await quote_service.quote_stats(
            db,
            supplier_id=supplier_id,
            project_id=project_id,
            quote_date_from=quote_date_from,
            quote_date_to=quote_date_to,
        )
    }


# ---------------------------------------------------------------------------
# List / single
# ---------------------------------------------------------------------------

@router.get("")
async def list_quotes(
    page: int = Query(1, ge=1),
    page_size: int = Query(20, ge=1, le=100),
    status: str | None = None,
    supplier_id=None,
    project_id=None,
    quote_date_from: datetime | None = None,
    quote_date_to: datetime | None = None,
    q: str | None = None,
    sort: str | None = None,
    expand: str | None = None,
    db: AsyncSession = Depends(get_db),
):
    stmt = select(Quote)
    if status:
        stmt = stmt.where(Quote.status == status)
    if supplier_id:
        stmt = stmt.where(Quote.supplier_id == supplier_id)
    if project_id:
        # any relevant link: legacy mirror, quote-level junction, line-item
        # candidates, or an accepted (decision) target — NOT just the mirror
        stmt = stmt.where(
            Quote.id.in_(
                select(Quote.id)
                .outerjoin(QuoteProjects, QuoteProjects.quote_id == Quote.id)
                .outerjoin(LineItem, LineItem.quote_id == Quote.id)
                .outerjoin(LineItemProjects, LineItemProjects.line_item_id == LineItem.id)
                .outerjoin(ItemDecision, ItemDecision.line_item_id == LineItem.id)
                .where(
                    (Quote.project_id == project_id)
                    | (QuoteProjects.project_id == project_id)
                    | (LineItemProjects.project_id == project_id)
                    | (ItemDecision.project_id == project_id)
                )
            )
        )
    if quote_date_from is not None:
        stmt = stmt.where(Quote.quote_date >= quote_date_from)
    if quote_date_to is not None:
        stmt = stmt.where(Quote.quote_date <= quote_date_to)
    if q:
        stmt = stmt.where(_quote_search(q))
    stmt = sort_query(stmt, Quote, sort, default="-quote_date")
    items, meta = await _paginate_quotes(db, stmt, page, page_size)
    return {"data": await serialize_quotes(db, items, parse_expand(expand)), "meta": meta}


async def _paginate_quotes(db: AsyncSession, stmt, page: int, page_size: int):
    total = await db.scalar(select(func.count()).select_from(stmt.subquery()))
    items = (await db.execute(stmt.offset((page - 1) * page_size).limit(page_size))).scalars().all()
    return items, {"total": total or 0, "page": page, "page_size": page_size}


@router.get("/{quote_id}")
async def get_quote(quote_id, expand: str | None = None, db: AsyncSession = Depends(get_db)):
    quote = await db.get(Quote, quote_id)
    if quote is None:
        raise NotFoundError("پیشنهاد (استعلام) یافت نشد")
    return {"data": await serialize_quote(db, quote, parse_expand(expand))}


# ---------------------------------------------------------------------------
# Create
# ---------------------------------------------------------------------------

@router.post("", status_code=201)
async def create_quote(
    payload: QuoteCreate,
    db: AsyncSession = Depends(get_db),
    actor: str = Depends(get_actor),
    ctx: UserContext = Depends(allow_quote_create()),
    _auth=None,
):
    # سطح limited: استعلام فقط برای پروژه‌های عضویت خودش
    if (ctx.panels or {}).get("procurement") == "limited" and ctx.role != "admin":
        allowed = set(ctx.project_ids or []) | set(ctx.member_project_ids or [])
        if ctx.project_id:
            allowed.add(ctx.project_id)
        allowed_str = {str(pid) for pid in allowed if pid}
        wanted = {str(pid) for pid in ([payload.project_id] + list(payload.project_ids or [])) if pid}
        if not wanted:
            raise ValidationError("برای افزودن استعلام، پروژه الزامی است")
        if not wanted <= allowed_str:
            raise ForbiddenError("استعلام فقط برای پروژه‌های تخصیص‌یافته به شما مجاز است")
    quote = await quote_service.create_quote(db, payload, actor)
    return {"data": await serialize_quote_with_children(db, quote)}


# ---------------------------------------------------------------------------
# Edit (metadata + backward transitions)
# ---------------------------------------------------------------------------

@router.patch("/{quote_id}")
async def update_quote(
    quote_id,
    payload: QuoteUpdate,
    db: AsyncSession = Depends(get_db),
    actor: str = Depends(get_actor),
    _auth=Depends(_procurement_writer),
):
    quote = await quote_service.update_quote(db, quote_id, payload, actor)
    return {"data": await serialize_quote(db, quote, set())}


@router.patch("/{quote_id}/children")
async def replace_quote_children(
    quote_id,
    payload: QuoteChildrenReplaceIn,
    db: AsyncSession = Depends(get_db),
    actor: str = Depends(get_actor),
    _auth=Depends(_procurement_writer),
):
    """Full replacement of a quote's line items + termsheets (edit modal)."""
    quote = await quote_service.replace_quote_children(db, quote_id, payload, actor)
    return {"data": await serialize_quote_with_children(db, quote)}


# ---------------------------------------------------------------------------
# Lifecycle
# ---------------------------------------------------------------------------

@router.patch("/{quote_id}/accept")
async def accept_quote(
    quote_id,
    payload: AcceptQuoteIn,
    db: AsyncSession = Depends(get_db),
    actor: str = Depends(get_actor),
    _auth=Depends(_procurement_writer),
):
    quote = await quote_service.accept_quote(db, quote_id, payload, actor)
    return {"data": await _accept_response(db, quote)}


async def _accept_response(db: AsyncSession, quote: Quote) -> dict:
    """Contract P0-18 response shape: id/status/accepted_date + decisions + termsheet statuses."""
    line_items = (await db.execute(select(LineItem).where(LineItem.quote_id == quote.id))).scalars().all()
    li_ids = [li.id for li in line_items]
    decisions: dict = {}
    if li_ids:
        decisions = {
            d.line_item_id: d
            for d in (await db.execute(select(ItemDecision).where(ItemDecision.line_item_id.in_(li_ids)))).scalars()
        }
    termsheets = (await db.execute(select(Termsheet).where(Termsheet.quote_id == quote.id))).scalars().all()
    return {
        "id": str(quote.id),
        "status": quote.status,
        "accepted_date": quote.accepted_date.isoformat() if quote.accepted_date else None,
        "line_items": [
            {
                "id": str(li.id),
                "decision": decision_brief(decisions[li.id]) if li.id in decisions else None,
            }
            for li in line_items
        ],
        "termsheets": [
            {"id": str(ts.id), "status": ts.status}
            for ts in sorted(termsheets, key=lambda t: t.created_at)
        ],
    }


@router.patch("/{quote_id}/arrive")
async def arrive_quote(
    quote_id,
    db: AsyncSession = Depends(get_db),
    actor: str = Depends(get_actor),
    _auth=Depends(_procurement_writer),
):
    quote = await quote_service.arrive_quote(db, quote_id, actor)
    return {
        "data": {
            "id": str(quote.id),
            "status": quote.status,
            "arrived_date": quote.arrived_date.isoformat() if quote.arrived_date else None,
        }
    }


@router.patch("/{quote_id}/arrive-items")
async def arrive_items(
    quote_id,
    payload: ArriveItemsIn,
    db: AsyncSession = Depends(get_db),
    actor: str = Depends(get_actor),
    _auth=Depends(_procurement_writer),
):
    quote = await quote_service.arrive_items(db, quote_id, payload, actor)
    return {
        "data": {
            "id": str(quote.id),
            "status": quote.status,
            "arrived_date": quote.arrived_date.isoformat() if quote.arrived_date else None,
            "items": [
                {
                    "line_item_id": str(item.line_item_id),
                    "received": True,
                    "received_qty": float(item.received_qty),
                }
                for item in payload.items
            ],
        }
    }


@router.patch("/{quote_id}/reject")
async def reject_quote(
    quote_id,
    payload: RejectQuoteIn | None = None,
    db: AsyncSession = Depends(get_db),
    actor: str = Depends(get_actor),
    _auth=Depends(_procurement_writer),
):
    quote = await quote_service.reject_quote(db, quote_id, payload or RejectQuoteIn(), actor)
    return {"data": {"id": str(quote.id), "status": quote.status}}


@router.patch("/{quote_id}/expire")
async def expire_quote(
    quote_id,
    db: AsyncSession = Depends(get_db),
    actor: str = Depends(get_actor),
    _auth=Depends(_procurement_writer),
):
    quote = await quote_service.expire_quote(db, quote_id, actor)
    return {"data": {"id": str(quote.id), "status": quote.status}}


# ---------------------------------------------------------------------------
# Delete (only offered / rejected / expired)
# ---------------------------------------------------------------------------

@router.delete("/{quote_id}")
async def delete_quote(
    quote_id,
    db: AsyncSession = Depends(get_db),
    _auth=Depends(_procurement_writer),
):
    result = await quote_service.delete_quote(db, quote_id)
    return {"data": result}