import re
import pickle
from secrets import token_urlsafe
from magic import Magic
from datetime import datetime, timedelta
from os import makedirs, path, remove, system
from classes.models import Photo, SearchResults
from modules.hasher import get_phash, get_duplicates
from modules.scheduler import scheduler
from modules.security import User, get_current_active_user
from modules.app import app
from modules.database import col_photos, col_albums, col_tokens
from bson.objectid import ObjectId
from bson.errors import InvalidId

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_409_CONFLICT

from modules.utils import logWrite

async def compress_image(image_path: str):

    image_type = Magic(mime=True).from_file(image_path)

    if image_type not in ["image/jpeg", "image/png"]:
        logWrite(f"Not compressing {image_path} because its mime is '{image_type}'")
        return

    size_before = path.getsize(image_path) / 1024

    system(f"exiftool -overwrite_original -all:all= -tagsFromFile @ -exif:Orientation {image_path}")

    if image_type == "image/jpeg":
        system(f"jpegoptim {image_path} -o --max=55 -p")
    elif image_type == "image/png":
        system(f"optipng -o3 {image_path}")

    size_after = path.getsize(image_path) / 1024
    logWrite(f"Compressed '{path.split(image_path)[-1]}' from {size_before} Kb to {size_after} Kb")

@app.post("/albums/{album}/photos", response_class=UJSONResponse, response_model=Photo, description="Upload a photo to album")
async def photo_upload(file: UploadFile, album: str, ignore_duplicates: bool = False, compress: bool = True, current_user: User = Security(get_current_active_user, scopes=["photos.write"])):

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

    # if not file.content_type.startswith("image"):
    #     return HTTPException(status_code=HTTP_406_NOT_ACCEPTABLE, detail="Provided file is not an image, 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": "Image duplicates found. Pass 'ignore_duplicates=true' to ignore.",
                "duplicates": duplicates
            },
            status_code=HTTP_409_CONFLICT
        )

    uploaded = col_photos.insert_one( {"user": current_user.user, "album": album, "hash": file_hash, "filename": filename} )

    if compress is True:
        scheduler.add_job(compress_image, trigger="date", run_date=datetime.now()+timedelta(seconds=1), args=[path.join("data", "users", current_user.user, "albums", album, filename)])

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

@app.get("/photos/{id}", description="Get a photo by id")
async def photo_get(id: str, current_user: User = Security(get_current_active_user, scopes=["photos.view"])):

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

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

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

    with open(image_path, "rb") as f: image_file = f.read() 

    return Response(image_file, media_type=mime)

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

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

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

    return Response(status_code=HTTP_204_NO_CONTENT)

@app.get("/albums/{album}/photos", response_class=UJSONResponse, response_model=SearchResults, description="Find a photo by filename")
async def photo_find(q: str, album: str, page: int = 1, page_size: int = 100, current_user: User = Security(get_current_active_user, scopes=["photos.list"])):

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

    if page <= 0 or page_size <= 0:
        return 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
    images = list(col_photos.find({"user": current_user.user, "album": album, "filename": re.compile(q)}, limit=page_size, skip=skip))

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

    if col_photos.count_documents( {"user": current_user.user, "album": album, "filename": re.compile(q)} ) > 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}/photos/token?token={token}" # type: ignore
    else:
        output["next_page"] = None # type: ignore

    return UJSONResponse(output)

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

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

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

    return await photo_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"]))