"""Script (口播文案库) CRUD routes — Issue #1795."""

from __future__ import annotations

from typing import Optional

from app.auth import AuthenticatedUser, get_current_user
from app.dependencies import get_db_session
from app.schemas.script import (
    CreateScriptRequest,
    ScriptListResponse,
    ScriptResponse,
    ScriptSegment,
    UpdateScriptRequest,
)
from app.services.script_service import ScriptNotFoundError, ScriptService
from fastapi import APIRouter, Depends, HTTPException, Query, Response, status
from sqlalchemy.orm import Session

router = APIRouter()


def _get_service(session: Session = Depends(get_db_session)) -> ScriptService:
    return ScriptService(session)


def _to_response(script) -> ScriptResponse:
    segments = script.segments or []
    return ScriptResponse(
        id=script.id,
        user_id=script.user_id,
        title=script.title,
        content=script.content,
        segments=[
            ScriptSegment(text=s.get("text", ""), duration=s.get("duration")) if isinstance(s, dict) else s
            for s in segments
        ],
        tags=script.tags or [],
        created_at=script.created_at,
        updated_at=script.updated_at,
    )


@router.get("", response_model=ScriptListResponse)
def list_scripts(
    skip: int = Query(0, ge=0),
    limit: int = Query(50, ge=1, le=200),
    tag: Optional[str] = Query(None, description="按标签筛选"),
    authenticated_user: AuthenticatedUser = Depends(get_current_user),
    svc: ScriptService = Depends(_get_service),
) -> ScriptListResponse:
    user_id = authenticated_user.user.id
    items, total = svc.list_scripts(user_id, skip=skip, limit=limit, tag=tag)
    return ScriptListResponse(
        items=[_to_response(i) for i in items],
        total=total,
    )


@router.post("", response_model=ScriptResponse, status_code=status.HTTP_201_CREATED)
def create_script(
    request: CreateScriptRequest,
    authenticated_user: AuthenticatedUser = Depends(get_current_user),
    svc: ScriptService = Depends(_get_service),
) -> ScriptResponse:
    user_id = authenticated_user.user.id
    script = svc.create_script(
        user_id=user_id,
        title=request.title,
        content=request.content,
        segments=[s.model_dump() for s in request.segments],
        tags=request.tags,
    )
    return _to_response(script)


@router.get("/{script_id}", response_model=ScriptResponse)
def get_script(
    script_id: str,
    authenticated_user: AuthenticatedUser = Depends(get_current_user),
    svc: ScriptService = Depends(_get_service),
) -> ScriptResponse:
    user_id = authenticated_user.user.id
    try:
        script = svc.get_script(script_id, user_id)
    except ScriptNotFoundError as exc:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Script not found") from exc
    return _to_response(script)


@router.put("/{script_id}", response_model=ScriptResponse)
def update_script(
    script_id: str,
    request: UpdateScriptRequest,
    authenticated_user: AuthenticatedUser = Depends(get_current_user),
    svc: ScriptService = Depends(_get_service),
) -> ScriptResponse:
    user_id = authenticated_user.user.id
    try:
        script = svc.update_script(
            script_id=script_id,
            user_id=user_id,
            title=request.title,
            content=request.content,
            segments=[s.model_dump() for s in request.segments] if request.segments is not None else None,
            tags=request.tags,
        )
    except ScriptNotFoundError as exc:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Script not found") from exc
    return _to_response(script)


@router.delete("/{script_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None, response_class=Response)
def delete_script(
    script_id: str,
    authenticated_user: AuthenticatedUser = Depends(get_current_user),
    svc: ScriptService = Depends(_get_service),
) -> Response:
    user_id = authenticated_user.user.id
    deleted = svc.delete_script(script_id, user_id)
    if not deleted:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Script not found")
    return