import re
from os import makedirs, path, rename
from shutil import rmtree
from typing import Union
from classes.models import Album, AlbumModified, SearchResults
from modules.app import app
from modules.database import col_photos, col_albums
from modules.security import User, get_current_active_user
from bson.objectid import ObjectId
from bson.errors import InvalidId

from fastapi import HTTPException, Security
from fastapi.responses import UJSONResponse, Response
from starlette.status import HTTP_204_NO_CONTENT, HTTP_404_NOT_FOUND, HTTP_406_NOT_ACCEPTABLE, HTTP_409_CONFLICT

@app.post("/albums", response_class=UJSONResponse, response_model=Album, description="Create album with name and title")
async def album_create(name: str, title: str, current_user: User = Security(get_current_active_user, scopes=["albums.write"])):

    if re.search(re.compile('^[a-z,0-9,_]*$'), name) is False:
        return HTTPException(status_code=HTTP_406_NOT_ACCEPTABLE, detail="Album name can only contain: a-z, 0-9 and _ characters.")
    
    if 2 > len(name) > 20:
        return HTTPException(status_code=HTTP_406_NOT_ACCEPTABLE, detail="Album name must be >2 and <20 characters.")

    if 2 > len(title) > 40:
        return HTTPException(status_code=HTTP_406_NOT_ACCEPTABLE, detail="Album title must be >2 and <40 characters.")

    if col_albums.find_one( {"name": name} ) is not None:
        return HTTPException(status_code=HTTP_409_CONFLICT, detail=f"Album with name '{name}' already exists.")

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

    uploaded = col_albums.insert_one( {"user": current_user.user, "name": name, "title": title, "cover": None} )

    return UJSONResponse(
        {
            "id": uploaded.inserted_id.__str__(),
            "name": name,
            "title": title
        }
    )

@app.get("/albums", response_model=SearchResults, description="Find album by name")
async def album_find(q: str, current_user: User = Security(get_current_active_user, scopes=["albums.list"])):

    output = {"results": []}
    albums = list(col_albums.find( {"user": current_user.user, "name": re.compile(q)} ))

    for album in albums:
        output["results"].append( {"id": album["_id"].__str__(), "name": album["name"]} )

    return UJSONResponse(output)

@app.patch("/albums/{id}", response_class=UJSONResponse, response_model=AlbumModified, description="Modify album's name or title by id")
async def album_patch(id: str, name: Union[str, None] = None, title: Union[str, None] = None, cover: Union[str, None] = None, current_user: User = Security(get_current_active_user, scopes=["albums.write"])):

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

    if title is not None:
        if 2 > len(title) > 40:
            return HTTPException(status_code=HTTP_406_NOT_ACCEPTABLE, detail="Album title must be >2 and <40 characters.")
    else:
        title = album["title"]

    if name is not None:
        if re.search(re.compile('^[a-z,0-9,_]*$'), name) is False:
            return HTTPException(status_code=HTTP_406_NOT_ACCEPTABLE, detail="Album name can only contain: a-z, 0-9 and _ characters.")
        if 2 > len(name) > 20:
            return HTTPException(status_code=HTTP_406_NOT_ACCEPTABLE, detail="Album name must be >2 and <20 characters.")
        rename(
            path.join("data", "users", current_user.user, "albums", album["name"]),
            path.join("data", "users", current_user.user, "albums", name)
        )
        col_photos.update_many( {"user": current_user.user, "album": album["name"]}, {"$set": {"album": name}} )
    else:
        name = album["name"]

    if cover is not None:
        image = col_photos.find_one( {"_id": ObjectId(cover), "album": album["name"]} )
        cover = image["_id"].__str__() if image is not None else album["cover"]
    else:
        cover = album["cover"]

    col_albums.update_one( {"_id": ObjectId(id)}, {"$set": {"name": name, "title": title, "cover": cover}} )

    return UJSONResponse(
        {
            "name": name,
            "title": title,
            "cover": cover
        }
    )

@app.put("/albums/{id}", response_class=UJSONResponse, response_model=AlbumModified, description="Modify album's name and title by id")
async def album_put(id: str, name: str, title: str, cover: str, current_user: User = Security(get_current_active_user, scopes=["albums.write"])):

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

    if re.search(re.compile('^[a-z,0-9,_]*$'), name) is False:
        return HTTPException(status_code=HTTP_406_NOT_ACCEPTABLE, detail="Album name can only contain: a-z, 0-9 and _ characters.")

    if 2 > len(name) > 20:
        return HTTPException(status_code=HTTP_406_NOT_ACCEPTABLE, detail="Album name must be >2 and <20 characters.")

    if 2 > len(title) > 40:
        return HTTPException(status_code=HTTP_406_NOT_ACCEPTABLE, detail="Album title must be >2 and <40 characters.")

    image = col_photos.find_one( {"_id": ObjectId(cover), "album": album["name"]} )
    cover = image["_id"].__str__() if image is not None else None # type: ignore
    
    rename(
        path.join("data", "users", current_user.user, "albums", album["name"]),
        path.join("data", "users", current_user.user, "albums", name)
    )

    col_photos.update_many( {"user": current_user.user, "album": album["name"]}, {"$set": {"album": name}} )
    col_albums.update_one( {"_id": ObjectId(id)}, {"$set": {"name": name, "title": title, "cover": cover}} )

    return UJSONResponse(
        {
            "name": name,
            "title": title,
            "cover": cover
        }
    )

@app.delete("/album/{id}", response_class=UJSONResponse, description="Delete album by id")
async def album_delete(id: str, current_user: User = Security(get_current_active_user, scopes=["albums.write"])):

    try:
        album = col_albums.find_one_and_delete( {"_id": ObjectId(id)} )
        if album is None:
            raise InvalidId(id)
    except InvalidId:
        return HTTPException(status_code=HTTP_404_NOT_FOUND, detail="Could not find an album with such id.")
    
    col_photos.delete_many( {"album": album["name"]} )

    rmtree(path.join("data", "users", current_user.user, "albums", album["name"]))

    return Response(status_code=HTTP_204_NO_CONTENT)