from datetime import datetime
from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select, delete
from ..dependencies import get_db, get_current_user
from ..models.user import User
from ..models.progress import MediaProgress, Bookmark
from ..models.media_item import LibraryItem
from ..schemas.user import UserOut, UserSettings
from ..routers.auth import _build_user_out

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


def _progress_to_out(p: MediaProgress) -> dict:
    return {
        "id": p.id,
        "libraryItemId": p.library_item_id,
        "episodeId": p.episode_id,
        "duration": p.duration,
        "progress": round(p.current_time / p.duration, 4) if p.duration > 0 else 0.0,
        "currentTime": p.current_time,
        "isFinished": p.is_finished,
        "hideFromContinueListening": p.hide_from_continue_listening,
        "lastUpdate": int(p.last_update.timestamp() * 1000) if p.last_update else 0,
        "startedAt": int(p.started_at.timestamp() * 1000) if p.started_at else 0,
        "finishedAt": int(p.finished_at.timestamp() * 1000) if p.finished_at else None,
    }


def _bookmark_to_out(b: Bookmark) -> dict:
    return {
        "libraryItemId": b.library_item_id,
        "title": b.title,
        "time": b.time_seconds,
        "createdAt": int(b.created_at.timestamp() * 1000) if b.created_at else 0,
    }


@router.get("")
async def get_me(
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    progress_result = await db.execute(
        select(MediaProgress).where(MediaProgress.user_id == current_user.id)
    )
    all_progress = progress_result.scalars().all()

    bookmarks_result = await db.execute(
        select(Bookmark).where(Bookmark.user_id == current_user.id)
    )
    all_bookmarks = bookmarks_result.scalars().all()

    user_out = _build_user_out(current_user)
    user_dict = user_out.model_dump(by_alias=True)
    user_dict["mediaProgress"] = [_progress_to_out(p) for p in all_progress]
    user_dict["bookmarks"] = [_bookmark_to_out(b) for b in all_bookmarks]
    return user_dict


@router.get("/progress")
async def get_all_progress(
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(MediaProgress).where(MediaProgress.user_id == current_user.id)
    )
    return [_progress_to_out(p) for p in result.scalars().all()]


@router.patch("/progress/{library_item_id}")
async def update_progress(
    library_item_id: str,
    body: dict,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    episode_id = body.get("episodeId")
    query = select(MediaProgress).where(
        MediaProgress.user_id == current_user.id,
        MediaProgress.library_item_id == library_item_id,
    )
    if episode_id:
        query = query.where(MediaProgress.episode_id == episode_id)

    result = await db.execute(query)
    progress = result.scalar_one_or_none()

    if not progress:
        progress = MediaProgress(
            user_id=current_user.id,
            library_item_id=library_item_id,
            episode_id=episode_id,
        )
        db.add(progress)

    if "currentTime" in body:
        progress.current_time = float(body["currentTime"])
    if "duration" in body:
        progress.duration = float(body["duration"])
    if "isFinished" in body:
        progress.is_finished = bool(body["isFinished"])
        if progress.is_finished and not progress.finished_at:
            progress.finished_at = datetime.utcnow()
    if "hideFromContinueListening" in body:
        progress.hide_from_continue_listening = bool(body["hideFromContinueListening"])
    if not progress.started_at:
        progress.started_at = datetime.utcnow()
    progress.last_update = datetime.utcnow()

    await db.commit()
    await db.refresh(progress)
    return _progress_to_out(progress)


@router.post("/sync-local-progress")
async def sync_local_progress(
    body: dict,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    local_progress_list = body.get("localMediaProgress", [])
    updated = []

    for lp in local_progress_list:
        lib_item_id = lp.get("libraryItemId")
        episode_id = lp.get("episodeId")
        if not lib_item_id:
            continue

        query = select(MediaProgress).where(
            MediaProgress.user_id == current_user.id,
            MediaProgress.library_item_id == lib_item_id,
        )
        if episode_id:
            query = query.where(MediaProgress.episode_id == episode_id)

        result = await db.execute(query)
        progress = result.scalar_one_or_none()

        local_last_update = lp.get("lastUpdate", 0)
        server_last_update = int(progress.last_update.timestamp() * 1000) if progress and progress.last_update else 0

        # Nur updaten wenn lokaler Stand neuer ist
        if not progress or local_last_update > server_last_update:
            if not progress:
                progress = MediaProgress(
                    user_id=current_user.id,
                    library_item_id=lib_item_id,
                    episode_id=episode_id,
                )
                db.add(progress)
            progress.current_time = float(lp.get("currentTime", 0))
            progress.duration = float(lp.get("duration", 0))
            progress.is_finished = bool(lp.get("isFinished", False))
            progress.last_update = datetime.utcnow()
            updated.append(lib_item_id)

    await db.commit()
    return {"updated": updated}


@router.delete("/progress/{progress_id}")
async def delete_progress(
    progress_id: str,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(MediaProgress).where(
            MediaProgress.id == progress_id,
            MediaProgress.user_id == current_user.id,
        )
    )
    progress = result.scalar_one_or_none()
    if not progress:
        raise HTTPException(status_code=404, detail="Progress not found")
    await db.delete(progress)
    await db.commit()
    return {"success": True}


@router.get("/bookmarks")
async def get_bookmarks(
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(Bookmark).where(Bookmark.user_id == current_user.id)
    )
    return [_bookmark_to_out(b) for b in result.scalars().all()]


@router.post("/bookmark/{library_item_id}")
async def create_bookmark(
    library_item_id: str,
    body: dict,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    bookmark = Bookmark(
        user_id=current_user.id,
        library_item_id=library_item_id,
        time_seconds=float(body.get("time", 0)),
        title=body.get("title", "Lesezeichen"),
    )
    db.add(bookmark)
    await db.commit()
    await db.refresh(bookmark)
    return _bookmark_to_out(bookmark)


@router.delete("/bookmark/{library_item_id}/{time}")
async def delete_bookmark(
    library_item_id: str,
    time: float,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(Bookmark).where(
            Bookmark.user_id == current_user.id,
            Bookmark.library_item_id == library_item_id,
            Bookmark.time_seconds == time,
        )
    )
    bookmark = result.scalar_one_or_none()
    if not bookmark:
        raise HTTPException(status_code=404, detail="Bookmark not found")
    await db.delete(bookmark)
    await db.commit()
    return {"success": True}