"""Deal API endpoints backed by DealService with inline payload schemas."""

from __future__ import annotations

from decimal import Decimal

from fastapi import APIRouter, Depends, HTTPException, Query, status
from pydantic import BaseModel

from app.api.deps import get_deal_repository, get_deal_service, get_organization_context
from app.models.deal import DealCreate, DealRead, DealStage, DealStatus
from app.repositories.deal_repo import DealAccessError, DealQueryParams, DealRepository
from app.services.deal_service import (
    DealService,
    DealStageTransitionError,
    DealStatusValidationError,
    DealUpdateData,
)
from app.services.organization_service import OrganizationContext


class DealCreatePayload(BaseModel):
    contact_id: int
    title: str
    amount: Decimal | None = None
    currency: str | None = None
    owner_id: int | None = None

    def to_domain(self, *, organization_id: int, fallback_owner: int) -> DealCreate:
        return DealCreate(
            organization_id=organization_id,
            contact_id=self.contact_id,
            owner_id=self.owner_id or fallback_owner,
            title=self.title,
            amount=self.amount,
            currency=self.currency,
        )


class DealUpdatePayload(BaseModel):
    status: DealStatus | None = None
    stage: DealStage | None = None
    amount: Decimal | None = None
    currency: str | None = None


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


@router.get("/", response_model=list[DealRead])
async def list_deals(
    page: int = Query(1, ge=1),
    page_size: int = Query(20, ge=1, le=100),
    status_filter: list[str] | None = Query(default=None, alias="status"),
    min_amount: Decimal | None = None,
    max_amount: Decimal | None = None,
    stage: str | None = None,
    owner_id: int | None = None,
    order_by: str | None = None,
    order: str | None = Query(default="desc", pattern="^(asc|desc)$"),
    context: OrganizationContext = Depends(get_organization_context),
    repo: DealRepository = Depends(get_deal_repository),
) -> list[DealRead]:
    """List deals for the current organization with optional filters."""

    try:
        statuses_value = [DealStatus(value) for value in status_filter] if status_filter else None
        stage_value = DealStage(stage) if stage else None
    except ValueError as exc:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail="Invalid deal filter"
        ) from exc

    params = DealQueryParams(
        organization_id=context.organization_id,
        page=page,
        page_size=page_size,
        statuses=statuses_value,
        stage=stage_value,
        owner_id=owner_id,
        min_amount=min_amount,
        max_amount=max_amount,
        order_by=order_by,
        order_desc=(order != "asc"),
    )
    try:
        deals = await repo.list(params=params, role=context.role, user_id=context.user_id)
    except DealAccessError as exc:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail=str(exc)) from exc

    return [DealRead.model_validate(deal) for deal in deals]


@router.post("/", response_model=DealRead, status_code=status.HTTP_201_CREATED)
async def create_deal(
    payload: DealCreatePayload,
    context: OrganizationContext = Depends(get_organization_context),
    service: DealService = Depends(get_deal_service),
) -> DealRead:
    """Create a new deal within the current organization."""

    data = payload.to_domain(
        organization_id=context.organization_id, fallback_owner=context.user_id
    )
    try:
        deal = await service.create_deal(data, context=context)
    except DealAccessError as exc:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail=str(exc)) from exc
    except DealStatusValidationError as exc:  # pragma: no cover - creation shouldn't trigger
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(exc)) from exc

    return DealRead.model_validate(deal)


@router.patch("/{deal_id}", response_model=DealRead)
async def update_deal(
    deal_id: int,
    payload: DealUpdatePayload,
    context: OrganizationContext = Depends(get_organization_context),
    repo: DealRepository = Depends(get_deal_repository),
    service: DealService = Depends(get_deal_service),
) -> DealRead:
    """Update deal status, stage, or financial data."""

    existing = await repo.get(
        deal_id,
        organization_id=context.organization_id,
        role=context.role,
        user_id=context.user_id,
    )
    if existing is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Deal not found")

    updates = DealUpdateData(
        status=payload.status,
        stage=payload.stage,
        amount=payload.amount,
        currency=payload.currency,
    )

    try:
        deal = await service.update_deal(existing, updates, context=context)
    except DealAccessError as exc:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail=str(exc)) from exc
    except DealStageTransitionError as exc:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(exc)) from exc
    except DealStatusValidationError as exc:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(exc)) from exc

    return DealRead.model_validate(deal)