import glob
import os
import pathlib
import shutil
from typing import Union

from fastapi import BackgroundTasks, Depends, Path, Request, UploadFile
from fastapi.params import File
from fastapi.responses import FileResponse, StreamingResponse
from loguru import logger

from app.config import config
from app.controllers import base
from app.controllers.manager.memory_manager import InMemoryTaskManager
from app.controllers.manager.redis_manager import RedisTaskManager
from app.controllers.v1.base import new_router
from app.models.exception import HttpException
from app.models.schema import (
    AudioRequest,
    BgmRetrieveResponse,
    BgmUploadResponse,
    SubtitleRequest,
    TaskDeletionResponse,
    TaskQueryRequest,
    TaskQueryResponse,
    TaskResponse,
    TaskVideoRequest,
)
from app.services import state as sm
from app.services import task as tm
from app.utils import utils

# 认证依赖项
router = new_router(dependencies=[Depends(base.verify_token)])
# router = new_router()

_enable_redis = config.app.get("enable_redis", False)
_redis_host = config.app.get("redis_host", "localhost")
_redis_port = config.app.get("redis_port", 6379)
_redis_db = config.app.get("redis_db", 0)
_redis_password = config.app.get("redis_password", None)
_max_concurrent_tasks = config.app.get("max_concurrent_tasks", 5)

redis_url = f"redis://:{_redis_password}@{_redis_host}:{_redis_port}/{_redis_db}"
# 根据配置选择合适的任务管理器
if _enable_redis:
    task_manager = RedisTaskManager(
        max_concurrent_tasks=_max_concurrent_tasks, redis_url=redis_url
    )
else:
    task_manager = InMemoryTaskManager(max_concurrent_tasks=_max_concurrent_tasks)


@router.post("/videos", response_model=TaskResponse, summary="Generate a short video")
def create_video(
    background_tasks: BackgroundTasks, request: Request, body: TaskVideoRequest
):
    return create_task(request, body, stop_at="video")


@router.post("/subtitle", response_model=TaskResponse, summary="Generate subtitle only")
def create_subtitle(
    background_tasks: BackgroundTasks, request: Request, body: SubtitleRequest
):
    return create_task(request, body, stop_at="subtitle")


@router.post("/audio", response_model=TaskResponse, summary="Generate audio only")
def create_audio(
    background_tasks: BackgroundTasks, request: Request, body: AudioRequest
):
    return create_task(request, body, stop_at="audio")


def create_task(
    request: Request,
    body: Union[TaskVideoRequest, SubtitleRequest, AudioRequest],
    stop_at: str,
):
    task_id = utils.get_uuid()
    request_id = base.get_task_id(request)
    try:
        task = {
            "task_id": task_id,
            "request_id": request_id,
            "params": "[REDACTED]",  # 不在日志中暴露完整参数
        }
        sm.state.update_task(task_id)
        task_manager.add_task(tm.start, task_id=task_id, params=body, stop_at=stop_at)
        logger.success(f"Task created: {utils.to_json(task)}")
        return utils.get_response(200, {"task_id": task_id, "request_id": request_id})
    except ValueError as e:
        raise HttpException(
            task_id=task_id, status_code=400, message=f"Invalid request parameters"
        )

from fastapi import Query

@router.get("/tasks", response_model=TaskQueryResponse, summary="Get all tasks")
def get_all_tasks(request: Request, page: int = Query(1, ge=1), page_size: int = Query(10, ge=1)):
    request_id = base.get_task_id(request)
    tasks, total = sm.state.get_all_tasks(page, page_size)

    response = {
        "tasks": tasks,
        "total": total,
        "page": page,
        "page_size": page_size,
    }
    return utils.get_response(200, response)



@router.get(
    "/tasks/{task_id}", response_model=TaskQueryResponse, summary="Query task status"
)
def get_task(
    request: Request,
    task_id: str = Path(..., description="Task ID"),
    query: TaskQueryRequest = Depends(),
):
    endpoint = config.app.get("endpoint", "")
    if not endpoint:
        endpoint = str(request.base_url)
    endpoint = endpoint.rstrip("/")

    request_id = base.get_task_id(request)
    task = sm.state.get_task(task_id)
    if task:
        task_dir = utils.task_dir()

        def file_to_uri(file):
            if not file.startswith(endpoint):
                _uri_path = v.replace(task_dir, "tasks").replace("\\", "/")
                _uri_path = f"{endpoint}/{_uri_path}"
            else:
                _uri_path = file
            return _uri_path

        if "videos" in task:
            videos = task["videos"]
            urls = []
            for v in videos:
                urls.append(file_to_uri(v))
            task["videos"] = urls
        if "combined_videos" in task:
            combined_videos = task["combined_videos"]
            urls = []
            for v in combined_videos:
                urls.append(file_to_uri(v))
            task["combined_videos"] = urls
        return utils.get_response(200, task)

    raise HttpException(
        task_id=task_id, status_code=404, message=f"{request_id}: task not found"
    )


@router.delete(
    "/tasks/{task_id}",
    response_model=TaskDeletionResponse,
    summary="Delete a generated short video task",
)
def delete_video(request: Request, task_id: str = Path(..., description="Task ID")):
    request_id = base.get_task_id(request)
    task = sm.state.get_task(task_id)
    if task:
        tasks_dir = utils.task_dir()
        current_task_dir = os.path.join(tasks_dir, task_id)
        if os.path.exists(current_task_dir):
            shutil.rmtree(current_task_dir)

        sm.state.delete_task(task_id)
        logger.success(f"Task deleted: {task_id}")  # 只记录任务ID，不暴露完整任务信息
        return utils.get_response(200)

    raise HttpException(
        task_id=task_id, status_code=404, message="Task not found"
    )


@router.get(
    "/musics", response_model=BgmRetrieveResponse, summary="Retrieve local BGM files"
)
def get_bgm_list(request: Request):
    suffix = "*.mp3"
    song_dir = utils.song_dir()
    files = glob.glob(os.path.join(song_dir, suffix))
    bgm_list = []
    for file in files:
        bgm_list.append(
            {
                "name": os.path.basename(file),
                "size": os.path.getsize(file),
                "file": file,
            }
        )
    response = {"files": bgm_list}
    return utils.get_response(200, response)


@router.post(
    "/musics",
    response_model=BgmUploadResponse,
    summary="Upload the BGM file to the songs directory",
)
def upload_bgm_file(request: Request, file: UploadFile = File(...)):
    request_id = base.get_task_id(request)
    # check file ext
    if file.filename.endswith("mp3"):
        song_dir = utils.song_dir()
        save_path = os.path.join(song_dir, file.filename)
        # save file
        with open(save_path, "wb+") as buffer:
            # If the file already exists, it will be overwritten
            file.file.seek(0)
            buffer.write(file.file.read())
        response = {"file": save_path}
        return utils.get_response(200, response)

    raise HttpException(
        "", status_code=400, message=f"{request_id}: Only *.mp3 files can be uploaded"
    )


@router.get("/stream/{file_path:path}")
async def stream_video(request: Request, file_path: str):
    tasks_dir = utils.task_dir()
    video_path = os.path.join(tasks_dir, file_path)
    range_header = request.headers.get("Range")
    video_size = os.path.getsize(video_path)
    start, end = 0, video_size - 1

    length = video_size
    if range_header:
        range_ = range_header.split("bytes=")[1]
        start, end = [int(part) if part else None for part in range_.split("-")]
        if start is None:
            start = video_size - end
            end = video_size - 1
        if end is None:
            end = video_size - 1
        length = end - start + 1

    def file_iterator(file_path, offset=0, bytes_to_read=None):
        with open(file_path, "rb") as f:
            f.seek(offset, os.SEEK_SET)
            remaining = bytes_to_read or video_size
            while remaining > 0:
                bytes_to_read = min(4096, remaining)
                data = f.read(bytes_to_read)
                if not data:
                    break
                remaining -= len(data)
                yield data

    response = StreamingResponse(
        file_iterator(video_path, start, length), media_type="video/mp4"
    )
    response.headers["Content-Range"] = f"bytes {start}-{end}/{video_size}"
    response.headers["Accept-Ranges"] = "bytes"
    response.headers["Content-Length"] = str(length)
    response.status_code = 206  # Partial Content

    return response


@router.get("/download/{file_path:path}")
async def download_video(_: Request, file_path: str):
    """
    download video
    :param _: Request request
    :param file_path: video file path, eg: /cd1727ed-3473-42a2-a7da-4faafafec72b/final-1.mp4
    :return: video file
    """
    tasks_dir = utils.task_dir()
    video_path = os.path.join(tasks_dir, file_path)
    file_path = pathlib.Path(video_path)
    filename = file_path.stem
    extension = file_path.suffix
    headers = {"Content-Disposition": f"attachment; filename={filename}{extension}"}
    return FileResponse(
        path=video_path,
        headers=headers,
        filename=f"{filename}{extension}",
        media_type=f"video/{extension[1:]}",
    )