import re
import pickle
from secrets import token_urlsafe
from shutil import move
from typing import Union
from magic import Magic
from datetime import datetime, timezone
from os import makedirs, path, remove
from classes.models import Video, SearchResults
#from modules.unified_exif_reader import extract_location
from modules.security import User, get_current_active_user
from modules.app import app
from modules.database import col_videos, col_albums, col_tokens
from bson.objectid import ObjectId
from bson.errors import InvalidId
from pymongo import DESCENDING

from fastapi import HTTPException, UploadFile, Security
from fastapi.responses import UJSONResponse, Response
from starlette.status import HTTP_204_NO_CONTENT, HTTP_400_BAD_REQUEST, HTTP_401_UNAUTHORIZED, HTTP_404_NOT_FOUND, HTTP_422_UNPROCESSABLE_ENTITY


@app.post("/albums/{album}/videos", response_class=UJSONResponse, response_model=Video, description="Upload a video to album")
async def video_upload(file: UploadFile, album: str, caption: Union[str, None] = None, current_user: User = Security(get_current_active_user, scopes=["videos.write"])):

    if col_albums.find_one( {"user": current_user.user, "name": album} ) is None:
        raise HTTPException(status_code=HTTP_404_NOT_FOUND, detail=f"Provided album '{album}' does not exist.")

    # if not file.content_type.startswith("video"):
    #     raise HTTPException(status_code=HTTP_406_NOT_ACCEPTABLE, detail="Provided file is not a video, not accepting.")

    makedirs(path.join("data", "users", current_user.user, "albums", album), exist_ok=True)

    filename = file.filename

    if path.exists(path.join("data", "users", current_user.user, "albums", album, file.filename)):
        base_name = file.filename.split(".")[:-1]
        extension = file.filename.split(".")[-1]
        filename = ".".join(base_name)+f"_{int(datetime.now().timestamp())}."+extension

    with open(path.join("data", "users", current_user.user, "albums", album, filename), "wb") as f:
        f.write(await file.read())

    # file_hash = await get_phash(path.join("data", "users", current_user.user, "albums", album, filename))
    # duplicates = await get_duplicates(file_hash, album)

    # if len(duplicates) > 0 and ignore_duplicates is False:
    #     return UJSONResponse(
    #         {
    #             "detail": "video duplicates found. Pass 'ignore_duplicates=true' to ignore.",
    #             "duplicates": duplicates
    #         },
    #         status_code=HTTP_409_CONFLICT
    #     )
    
    #coords = extract_location(path.join("data", "users", current_user.user, "albums", album, filename))
    uploaded = col_videos.insert_one(
        {
            "user": current_user.user,
            "album": album,
            "filename": filename,
            "dates": {
                "uploaded": datetime.now(tz=timezone.utc),
                "modified": datetime.now(tz=timezone.utc)
            },
            "caption": caption,
            # "location": [
            #     coords["lng"],
            #     coords["lat"],
            #     coords["alt"]
            # ]
        }
    )

    return UJSONResponse(
        {
            "id": uploaded.inserted_id.__str__(),
            "album": album,
            "filename": filename
        }
    )

@app.get("/videos/{id}", description="Get a video by id")
async def video_get(id: str, current_user: User = Security(get_current_active_user, scopes=["videos.read"])):

    try:
        video = col_videos.find_one( {"_id": ObjectId(id)} )
        if video is None:
            raise InvalidId(id)
    except InvalidId:
        raise HTTPException(status_code=HTTP_404_NOT_FOUND, detail="Could not find a video with such id.")

    video_path = path.join("data", "users", current_user.user, "albums", video["album"], video["filename"])

    mime = Magic(mime=True).from_file(video_path)

    with open(video_path, "rb") as f: video_file = f.read() 

    return Response(video_file, media_type=mime)

@app.put("/videos/{id}", description="Move a video into another album")
async def video_move(id: str, album: str, current_user: User = Security(get_current_active_user, scopes=["videos.write"])):

    try:
        video = col_videos.find_one( {"_id": ObjectId(id)} )
        if video is None:
            raise InvalidId(id)
    except InvalidId:
        raise HTTPException(status_code=HTTP_404_NOT_FOUND, detail="Could not find an video with such id.")

    if col_albums.find_one( {"user": current_user.user, "name": album} ) is None:
        raise HTTPException(status_code=HTTP_404_NOT_FOUND, detail=f"Provided album '{album}' does not exist.")

    if path.exists(path.join("data", "users", current_user.user, "albums", album, video["filename"])):
        base_name = video["filename"].split(".")[:-1]
        extension = video["filename"].split(".")[-1]
        filename = ".".join(base_name)+f"_{int(datetime.now().timestamp())}."+extension
    else:
        filename = video["filename"]

    col_videos.find_one_and_update( {"_id": ObjectId(id)}, {"$set": {"album": album, "filename": filename, "dates.modified": datetime.now(tz=timezone.utc)}} )

    move(
        path.join("data", "users", current_user.user, "albums", video["album"], video["filename"]),
        path.join("data", "users", current_user.user, "albums", album, filename)
    )

    return UJSONResponse(
        {
            "id": video["_id"].__str__(),
            "filename": filename
        }
    )

@app.patch("/videos/{id}", description="Change properties of a video")
async def video_patch(id: str, caption: str, current_user: User = Security(get_current_active_user, scopes=["videos.write"])):

    try:
        video = col_videos.find_one( {"_id": ObjectId(id)} )
        if video is None:
            raise InvalidId(id)
    except InvalidId:
        raise HTTPException(status_code=HTTP_404_NOT_FOUND, detail="Could not find an video with such id.")

    col_videos.find_one_and_update( {"_id": ObjectId(id)}, {"$set": {"caption": caption, "dates.modified": datetime.now(tz=timezone.utc)}} )

    return UJSONResponse(
        {
            "id": video["_id"].__str__(),
            "filename": caption
        }
    )

@app.delete("/videos/{id}", description="Delete a video by id")
async def video_delete(id: str, current_user: User = Security(get_current_active_user, scopes=["videos.write"])):

    try:
        video = col_videos.find_one_and_delete( {"_id": ObjectId(id)} )
        if video is None:
            raise InvalidId(id)
    except InvalidId:
        raise HTTPException(status_code=HTTP_404_NOT_FOUND, detail="Could not find a video with such id.")

    album = col_albums.find_one( {"name": video["album"]} )

    remove(path.join("data", "users", current_user.user, "albums", video["album"], video["filename"]))

    return Response(status_code=HTTP_204_NO_CONTENT)

@app.get("/albums/{album}/videos", response_class=UJSONResponse, response_model=SearchResults, description="Find a video by filename")
async def video_find(album: str, q: Union[str, None] = None, caption: Union[str, None] = None, page: int = 1, page_size: int = 100, current_user: User = Security(get_current_active_user, scopes=["videos.list"])):

    if col_albums.find_one( {"user": current_user.user, "name": album} ) is None:
        raise HTTPException(status_code=HTTP_404_NOT_FOUND, detail=f"Provided album '{album}' does not exist.")

    if page <= 0 or page_size <= 0:
        raise HTTPException(status_code=HTTP_400_BAD_REQUEST, detail="Parameters 'page' and 'page_size' must be greater or equal to 1.")

    output = {"results": []}
    skip = (page-1)*page_size

    if q is None and caption is None:
        raise HTTPException(status_code=HTTP_422_UNPROCESSABLE_ENTITY, detail="You must provide query or caption to look for videos")
    
    if q is None and caption is not None:
        db_query = {"user": current_user.user, "album": album, "caption": re.compile(caption)}
        db_query_count = {"user": current_user.user, "album": album, "caption": re.compile(caption)}
    elif q is not None and caption is None:
        db_query = list(col_videos.find({"user": current_user.user, "album": album, "filename": re.compile(q)}, limit=page_size, skip=skip).sort('dates.uploaded', DESCENDING))
        db_query_count = {"user": current_user.user, "album": album, "caption": re.compile(q)}
    else:
        db_query = list(col_videos.find({"user": current_user.user, "album": album, "filename": re.compile(q), "caption": re.compile(caption)}, limit=page_size, skip=skip).sort('dates.uploaded', DESCENDING)) # type: ignore
        db_query_count = {"user": current_user.user, "album": album, "filename": re.compile(q), "caption": re.compile(caption)} # type: ignore

    videos = list(col_videos.find(db_query, limit=page_size, skip=skip).sort('dates.uploaded', DESCENDING))

    for video in videos:
        output["results"].append({"id": video["_id"].__str__(), "filename": video["filename"]})

    if col_videos.count_documents( db_query_count ) > page*page_size:
        token = str(token_urlsafe(32))
        col_tokens.insert_one( {"token": token, "query": q, "album": album, "page": page+1, "page_size": page_size, "user": pickle.dumps(current_user)} )
        output["next_page"] = f"/albums/{album}/videos/token?token={token}" # type: ignore
    else:
        output["next_page"] = None # type: ignore

    return UJSONResponse(output)

@app.get("/albums/{album}/videos/token", response_class=UJSONResponse, response_model=SearchResults, description="Find a video by token")
async def video_find_token(token: str):

    found_record = col_tokens.find_one( {"token": token} )

    if found_record is None:
        raise HTTPException(status_code=HTTP_401_UNAUTHORIZED, detail="Invalid search token.")

    return await video_find(q=found_record["query"], album=found_record["album"], page=found_record["page"], page_size=found_record["page_size"], current_user=pickle.loads(found_record["user"]))