import re
import pickle
from secrets import token_urlsafe
from shutil import move
from threading import Thread
from typing import Union
from uuid import uuid4
from magic import Magic
from datetime import datetime, timedelta, timezone
from os import makedirs, path, remove, system

from pydantic import ValidationError
from classes.exceptions import AccessTokenInvalidError, AlbumNameNotFoundError, PhotoNotFoundError, PhotoSearchQueryEmptyError, SearchPageInvalidError, SearchTokenInvalidError
from classes.models import Photo, PhotoPublic, SearchResultsPhoto
from modules.exif_reader import extract_location
from modules.hasher import get_phash, get_duplicates
from modules.scheduler import scheduler
from modules.security import ALGORITHM, SECRET_KEY, TokenData, User, create_access_token, get_current_active_user, get_user
from modules.app import app
from modules.database import col_photos, col_albums, col_tokens
from pymongo import DESCENDING
from bson.objectid import ObjectId
from bson.errors import InvalidId
from plum.exceptions import UnpackError
from jose import JWTError, jwt

from fastapi import UploadFile, Security
from fastapi.responses import UJSONResponse, Response
from fastapi.exceptions import HTTPException
from starlette.status import HTTP_204_NO_CONTENT, HTTP_401_UNAUTHORIZED, 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

    if image_type == "image/jpeg":
        task = Thread(target=system, kwargs={"command": f'jpegoptim "{image_path}" -o --max=55 -p --strip-none'})
    elif image_type == "image/png":
        task = Thread(target=system, kwargs={"command": f'optipng -o3 "{image_path}"'})
    else:
        return

    task.start()
    logWrite(f"Compressing '{path.split(image_path)[-1]}'...")
    task.join()

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

photo_post_responses = {
    404: AlbumNameNotFoundError("name").openapi,
    409: {
        "description": "Image Duplicates Found",
        "content": {
            "application/json": {
                "example": {
                    "detail": "Image duplicates found. Pass 'ignore_duplicates=true' to ignore.",
                    "duplicates": [
                        "string"
                    ],
                    "access_token": "string"
                }
            }
        }
    }
}
@app.post("/albums/{album}/photos", description="Upload a photo to album", response_class=UJSONResponse, response_model=Photo, responses=photo_post_responses)
async def photo_upload(file: UploadFile, album: str, ignore_duplicates: bool = False, compress: bool = True, caption: Union[str, None] = None, current_user: User = Security(get_current_active_user, scopes=["photos.write"])):

    if col_albums.find_one( {"user": current_user.user, "name": album} ) is None:
        raise AlbumNameNotFoundError(album)

    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:
        duplicates_ids = []
        for entry in duplicates:
            duplicates_ids.append(entry["id"])
        access_token = create_access_token(data={"sub": current_user.user, "scopes": ["me", "photos.read"], "allowed": duplicates_ids}, expires_delta=timedelta(hours=1))
        access_token_short = uuid4().hex[:12].lower()
        col_tokens.insert_one({"short": access_token_short, "access_token": access_token, "photos": duplicates_ids})
        return UJSONResponse(
            {
                "detail": "Image duplicates found. Pass 'ignore_duplicates=true' to ignore.",
                "duplicates": duplicates,
                "access_token": access_token_short
            },
            status_code=HTTP_409_CONFLICT
        )

    try:
        coords = extract_location(path.join("data", "users", current_user.user, "albums", album, filename))
    except (UnpackError, ValueError):
        coords = {
            "lng": 0.0,
            "lat": 0.0,
            "alt": 0.0
        }

    uploaded = col_photos.insert_one(
        {
            "user": current_user.user,
            "album": album, 
            "hash": file_hash,
            "filename": filename,
            "dates": {
                "uploaded": datetime.now(tz=timezone.utc),
                "modified": datetime.now(tz=timezone.utc)
            },
            "location": [
                coords["lng"],
                coords["lat"],
                coords["alt"]
            ],
            "caption": caption
        }
    )

    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
        }
    )

photo_get_token_responses = {
    401: AccessTokenInvalidError().openapi,
    404: PhotoNotFoundError("id").openapi
}
@app.get("/token/photo/{token}", description="Get a photo by its duplicate token", responses=photo_get_token_responses)
async def photo_get_token(token: str, id: int):

    db_entry = col_tokens.find_one({"short": token})

    if db_entry is None:
        raise AccessTokenInvalidError()

    token = db_entry["access_token"]
    id = db_entry["photos"][id]

    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        user: str = payload.get("sub")
        if user is None:
            raise AccessTokenInvalidError()
        token_scopes = payload.get("scopes", [])
        token_data = TokenData(scopes=token_scopes, user=user)
    except (JWTError, ValidationError) as exp:
        print(exp, flush=True)
        raise AccessTokenInvalidError()
        
    user = get_user(user=token_data.user)

    if id not in payload.get("allowed", []):
        raise AccessTokenInvalidError()

    try:
        image = col_photos.find_one( {"_id": ObjectId(id)} )
        if image is None:
            raise InvalidId(id)
    except InvalidId:
        raise PhotoNotFoundError(id)

    image_path = path.join("data", "users", 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)

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

    try:
        image = col_photos.find_one( {"_id": ObjectId(id)} )
        if image is None:
            raise InvalidId(id)
    except InvalidId:
        raise PhotoNotFoundError(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)

photo_move_responses = {
    404: PhotoNotFoundError("id").openapi
}
@app.put("/photos/{id}", description="Move a photo to another album", response_model=PhotoPublic, responses=photo_move_responses)
async def photo_move(id: str, album: str, current_user: User = Security(get_current_active_user, scopes=["photos.write"])):

    try:
        image = col_photos.find_one( {"_id": ObjectId(id)} )
        if image is None:
            raise InvalidId(id)
    except InvalidId:
        raise PhotoNotFoundError(id)

    if col_albums.find_one( {"user": current_user.user, "name": album} ) is None:
        raise AlbumNameNotFoundError(album)

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

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

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

photo_patch_responses = {
    404: PhotoNotFoundError("id").openapi
}
@app.patch("/photos/{id}", description="Change properties of a photo", response_model=PhotoPublic, responses=photo_patch_responses)
async def photo_patch(id: str, caption: str, current_user: User = Security(get_current_active_user, scopes=["photos.write"])):

    try:
        image = col_photos.find_one( {"_id": ObjectId(id)} )
        if image is None:
            raise InvalidId(id)
    except InvalidId:
        raise PhotoNotFoundError(id)

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

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

photo_delete_responses = {
    404: PhotoNotFoundError("id").openapi
}
@app.delete("/photos/{id}", description="Delete a photo by id", status_code=HTTP_204_NO_CONTENT, responses=photo_delete_responses)
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:
        raise PhotoNotFoundError(id)

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

    if album is not None and album["cover"] == image["_id"].__str__():
        col_albums.update_one( {"name": image["album"]}, {"$set": {"cover": None}} )

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

    return Response(status_code=HTTP_204_NO_CONTENT)

photo_find_responses = {
    400: SearchPageInvalidError().openapi,
    404: AlbumNameNotFoundError("name").openapi,
    422: PhotoSearchQueryEmptyError().openapi
}
@app.get("/albums/{album}/photos", description="Find a photo by filename", response_class=UJSONResponse, response_model=SearchResultsPhoto, responses=photo_find_responses)
async def photo_find(album: str, q: Union[str, None] = None, caption: Union[str, None] = None, page: int = 1, page_size: int = 100, lat: Union[float, None] = None, lng: Union[float, None] = None, radius: Union[int, None] = None, current_user: User = Security(get_current_active_user, scopes=["photos.list"])):

    if col_albums.find_one( {"user": current_user.user, "name": album} ) is None:
        raise AlbumNameNotFoundError(album)

    if page <= 0 or page_size <= 0:
        raise SearchPageInvalidError()

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

    radius = 5000 if radius is None else radius

    if (lat is not None) and (lng is not None):
        db_query = {"user": current_user.user, "album": album, "location": { "$nearSphere": {"$geometry": {"type": "Point", "coordinates": [lng, lat]}, "$maxDistance": radius} } }
        db_query_count = {"user": current_user.user, "album": album, "location": { "$geoWithin": { "$centerSphere": [ [lng, lat], radius ] } } }
    elif q is None and caption is None:
        raise PhotoSearchQueryEmptyError()
    elif 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 = {"user": current_user.user, "album": album, "filename": re.compile(q)}
        db_query_count = {"user": current_user.user, "album": album, "filename": re.compile(q)}
    else:
        db_query = {"user": current_user.user, "album": album, "filename": re.compile(q), "caption": re.compile(caption)} # type: ignore
        db_query_count = {"user": current_user.user, "album": album, "filename": re.compile(q), "caption": re.compile(caption)} # type: ignore

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

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

    if col_photos.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}/photos/token?token={token}" # type: ignore
    else:
        output["next_page"] = None # type: ignore

    return UJSONResponse(output)

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

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

    if found_record is None:
        raise SearchTokenInvalidError()

    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"]))