"""Entry point for Kashikogi Async Space."""

import json
from typing import Optional

import gradio as gr
import uvicorn
from fastapi import FastAPI, HTTPException, Request, status
from pydantic import ValidationError

from kashikogi_app.core.config import get_settings
from kashikogi_app.core.jobs import VideoJobManager
from kashikogi_app.core.logging_config import configure_logging
from kashikogi_app.gradio_interface import build_demo
from kashikogi_app.models.audio import AudioUploadRequest, AudioUploadResponse
from kashikogi_app.models.video import (
    VideoJobStatusResponse,
    VideoRenderRequest,
    VideoRenderResponse,
)
from kashikogi_app.services.audio import store_audio
from kashikogi_app.services.callbacks import notify_dify_workflow
from kashikogi_app.services.video import render_video_job

configure_logging()
settings = get_settings()

job_manager = VideoJobManager(
    worker_count=settings.video_jobs_max_workers,
    cleanup_ttl_seconds=settings.video_job_cleanup_seconds,
    job_handler=render_video_job,
    callback_handler=notify_dify_workflow,
)

demo = build_demo(job_manager)

api = FastAPI(
    title="Kashikogi Async Space API",
    description="Audio storage and video rendering endpoints.",
    version="0.1.0",
)


def _extract_header_token(request: Request) -> Optional[str]:
    auth = request.headers.get("Authorization")
    if not auth:
        return None
    if auth.lower().startswith("bearer "):
        return auth[7:].strip()
    return auth.strip()


def _ensure_authorised(token: Optional[str]) -> None:
    if not settings.callback_token:
        return
    if not token:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Missing callback token")
    if token != settings.callback_token:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid callback token")


@api.post("/audio/upload", response_model=AudioUploadResponse)
async def upload_audio_endpoint(request: Request) -> AudioUploadResponse:
    try:
        body_data = await request.json()
    except json.JSONDecodeError as exc:  # noqa: F841
        raise HTTPException(status_code=400, detail="Invalid JSON payload") from exc

    if not isinstance(body_data, dict):
        raise HTTPException(status_code=400, detail="JSON object expected")

    inline_token = body_data.pop("callback_token", None)
    token = _extract_header_token(request) or inline_token
    _ensure_authorised(token)

    try:
        audio_request = AudioUploadRequest(**body_data)
        return store_audio(audio_request)
    except ValidationError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    except HTTPException:
        raise
    except Exception as exc:  # noqa: BLE001
        raise HTTPException(status_code=500, detail=str(exc)) from exc


@api.post(
    "/video/render",
    response_model=VideoRenderResponse,
    status_code=status.HTTP_202_ACCEPTED,
)
async def render_video_endpoint(request: Request) -> VideoRenderResponse:
    """
    柔軟なリクエスト処理:
    - 正しいJSONオブジェクト
    - JSON文字列（Dify RAW-TEXTモードからエスケープされたもの）
    の両方を受け付ける
    """
    try:
        # リクエストボディを文字列として取得
        body_bytes = await request.body()
        body_str = body_bytes.decode("utf-8")
        
        # まずJSONとしてパース
        body_data = json.loads(body_str)
        
        # body_dataが文字列の場合、さらにパース（二重エンコード対策）
        if isinstance(body_data, str):
            body_data = json.loads(body_data)
        
        if not isinstance(body_data, dict):
            raise HTTPException(status_code=400, detail="JSON object expected")

        header_token = _extract_header_token(request)
        inline_token = body_data.get("callback_token")

        _ensure_authorised(header_token or inline_token)

        # Pydanticモデルに変換
        video_request = VideoRenderRequest(**body_data)
        video_request.callback_token = None

    except json.JSONDecodeError as exc:
        raise HTTPException(
            status_code=400,
            detail=f"Invalid JSON: {str(exc)}"
        ) from exc
    except Exception as exc:
        raise HTTPException(
            status_code=400,
            detail=f"Invalid request format: {str(exc)}"
        ) from exc
    
    if not video_request.slides:
        raise HTTPException(status_code=400, detail="slides must not be empty")

    try:
        job_id = job_manager.submit(video_request)
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    except Exception as exc:  # noqa: BLE001
        raise HTTPException(status_code=500, detail=str(exc)) from exc

    return VideoRenderResponse(status="accepted", job_id=job_id, message="Job queued")


@api.get("/jobs/{job_id}", response_model=VideoJobStatusResponse)
def get_job_status(job_id: str) -> VideoJobStatusResponse:
    status_payload = job_manager.get(job_id)
    if not status_payload:
        raise HTTPException(status_code=404, detail="Job not found")
    return status_payload


@api.get("/health")
def health_check() -> dict[str, str]:
    return {"status": "ok"}


app = gr.mount_gradio_app(api, demo, path="/")

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=7860)