from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session
from starlette.requests import Request

from app.core.rbac import require_any_permission, require_permission
from app.db.database import get_db
from app.models.repair import Repair
from app.models.repair_estimate import RepairEstimate
from app.models.user import User
from app.repositories.repair_estimate_repository import RepairEstimateRepository
from app.repositories.repair_repository import RepairRepository
from app.schemas.repair_estimate import (
    PublicEstimateDecisionRequest,
    PublicEstimateResponse,
    RepairEstimateCreate,
    RepairEstimateEventResponse,
    RepairEstimateResponse,
    RepairEstimateUpdate,
)
from app.services.repair_estimate_service import RepairEstimateService
from app.services.repair_public_link_service import RepairPublicLinkService

router = APIRouter(tags=["Repair Estimates"])


def get_repair_or_404(db: Session, repair_id: int) -> Repair:
    repair = RepairRepository.get_by_id(db, repair_id)
    if repair is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Reparatur nicht gefunden")
    return repair


def get_estimate_or_404(db: Session, repair_id: int, estimate_id: int) -> RepairEstimate:
    estimate = RepairEstimateRepository.get(db, repair_id=repair_id, estimate_id=estimate_id)
    if estimate is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Kostenvoranschlag nicht gefunden")
    return estimate


@router.get("/repairs/{repair_id}/estimates", response_model=list[RepairEstimateResponse])
def list_estimates(
    repair_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("repair_estimates.read")),
):
    get_repair_or_404(db, repair_id)
    return RepairEstimateRepository.list_by_repair(db, repair_id)


@router.post("/repairs/{repair_id}/estimates", response_model=RepairEstimateResponse, status_code=status.HTTP_201_CREATED)
def create_estimate(
    repair_id: int,
    payload: RepairEstimateCreate,
    request: Request,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("repair_estimates.create")),
):
    repair = get_repair_or_404(db, repair_id)
    return RepairEstimateService.create(db, repair, payload, actor=current_user, request=request)


@router.get("/repairs/{repair_id}/estimates/{estimate_id}", response_model=RepairEstimateResponse)
def get_estimate(
    repair_id: int,
    estimate_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("repair_estimates.read")),
):
    get_repair_or_404(db, repair_id)
    return get_estimate_or_404(db, repair_id, estimate_id)


@router.put("/repairs/{repair_id}/estimates/{estimate_id}", response_model=RepairEstimateResponse)
def update_estimate(
    repair_id: int,
    estimate_id: int,
    payload: RepairEstimateUpdate,
    request: Request,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("repair_estimates.update")),
):
    repair = get_repair_or_404(db, repair_id)
    estimate = get_estimate_or_404(db, repair_id, estimate_id)
    return RepairEstimateService.update(db, repair, estimate, payload, actor=current_user, request=request)


@router.delete("/repairs/{repair_id}/estimates/{estimate_id}", status_code=status.HTTP_204_NO_CONTENT)
def delete_estimate(
    repair_id: int,
    estimate_id: int,
    request: Request,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("repair_estimates.delete")),
):
    repair = get_repair_or_404(db, repair_id)
    estimate = get_estimate_or_404(db, repair_id, estimate_id)
    RepairEstimateService.delete(db, repair, estimate, actor=current_user, request=request)
    return None


@router.post("/repairs/{repair_id}/estimates/{estimate_id}/send", response_model=RepairEstimateResponse)
def send_estimate(
    repair_id: int,
    estimate_id: int,
    request: Request,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("repair_estimates.send")),
):
    repair = get_repair_or_404(db, repair_id)
    estimate = get_estimate_or_404(db, repair_id, estimate_id)
    return RepairEstimateService.send(db, repair, estimate, actor=current_user, request=request)


@router.post("/repairs/{repair_id}/estimates/{estimate_id}/cancel", response_model=RepairEstimateResponse)
def cancel_estimate(
    repair_id: int,
    estimate_id: int,
    request: Request,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_permission(["repair_estimates.update", "repair_estimates.send"])),
):
    repair = get_repair_or_404(db, repair_id)
    estimate = get_estimate_or_404(db, repair_id, estimate_id)
    return RepairEstimateService.cancel(db, repair, estimate, actor=current_user, request=request)


@router.post("/repairs/{repair_id}/estimates/{estimate_id}/revoke", response_model=RepairEstimateResponse)
def revoke_estimate(
    repair_id: int,
    estimate_id: int,
    request: Request,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("repair_estimates.revoke")),
):
    repair = get_repair_or_404(db, repair_id)
    estimate = get_estimate_or_404(db, repair_id, estimate_id)
    return RepairEstimateService.revoke(db, repair, estimate, actor=current_user, request=request)


@router.get("/repairs/{repair_id}/estimates/{estimate_id}/events", response_model=list[RepairEstimateEventResponse])
def list_estimate_events(
    repair_id: int,
    estimate_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("repair_estimates.read")),
):
    estimate = get_estimate_or_404(db, repair_id, estimate_id)
    return estimate.events


def get_public_repair_and_estimate(db: Session, token: str) -> tuple[Repair, RepairEstimate]:
    public_link = RepairPublicLinkService.get_public_link_or_404(db, token)
    repair = public_link.repair
    estimate = RepairEstimateRepository.get_latest_public(db, repair.id)
    if estimate is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Kostenvoranschlag nicht gefunden")
    RepairRepository.mark_public_link_used(db, public_link)
    return repair, estimate


@router.post("/public/repairs/status/{token}/estimate/approve", response_model=PublicEstimateResponse)
def approve_public_estimate(
    token: str,
    payload: PublicEstimateDecisionRequest,
    request: Request,
    db: Session = Depends(get_db),
):
    repair, estimate = get_public_repair_and_estimate(db, token)
    updated = RepairEstimateService.customer_decision(db, repair, estimate, "approve", payload, request=request)
    return RepairEstimateService.public_response(updated)


@router.post("/public/repairs/status/{token}/estimate/decline", response_model=PublicEstimateResponse)
def decline_public_estimate(
    token: str,
    payload: PublicEstimateDecisionRequest,
    request: Request,
    db: Session = Depends(get_db),
):
    repair, estimate = get_public_repair_and_estimate(db, token)
    updated = RepairEstimateService.customer_decision(db, repair, estimate, "decline", payload, request=request)
    return RepairEstimateService.public_response(updated)


@router.post("/public/repairs/status/{token}/estimate/question", response_model=PublicEstimateResponse)
def question_public_estimate(
    token: str,
    payload: PublicEstimateDecisionRequest,
    request: Request,
    db: Session = Depends(get_db),
):
    repair, estimate = get_public_repair_and_estimate(db, token)
    updated = RepairEstimateService.customer_decision(db, repair, estimate, "question", payload, request=request)
    return RepairEstimateService.public_response(updated)