import json
from io import BytesIO
from typing import Annotated

from fastapi import Path as PathVar
from fastapi import Request, UploadFile, status

from decorators.auth import protected_route
from endpoints.responses.collection import (
    CollectionSchema,
    SmartCollectionSchema,
    VirtualCollectionSchema,
)
from exceptions.endpoint_exceptions import (
    CollectionAlreadyExistsException,
    CollectionNotFoundInDatabaseException,
    CollectionPermissionError,
)
from handler.auth.constants import Scope
from handler.database import db_collection_handler
from handler.filesystem import fs_resource_handler
from handler.filesystem.base_handler import CoverSize
from logger.formatter import BLUE
from logger.formatter import highlight as hl
from logger.logger import log
from models.collection import Collection, SmartCollection
from utils.router import APIRouter

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


@protected_route(router.post, "", [Scope.COLLECTIONS_WRITE])
async def add_collection(
    request: Request,
    is_public: bool | None = None,
    is_favorite: bool | None = None,
    artwork: UploadFile | None = None,
) -> CollectionSchema:
    """Create collection endpoint

    Args:
        request (Request): Fastapi Request object

    Returns:
        CollectionSchema: Just created collection
    """

    data = await request.form()
    cleaned_data = {
        "name": data.get("name", ""),
        "description": data.get("description", ""),
        "url_cover": data.get("url_cover", ""),
        "is_public": is_public or False,
        "is_favorite": is_favorite or False,
        "user_id": request.user.id,
    }
    db_collection = db_collection_handler.get_collection_by_name(
        cleaned_data["name"], request.user.id
    )

    if db_collection:
        raise CollectionAlreadyExistsException(cleaned_data["name"])

    _added_collection = db_collection_handler.add_collection(Collection(**cleaned_data))

    if artwork is not None and artwork.filename is not None:
        file_ext = artwork.filename.split(".")[-1]
        artwork_content = BytesIO(await artwork.read())
        (
            path_cover_l,
            path_cover_s,
        ) = await fs_resource_handler.store_artwork(
            _added_collection, artwork_content, file_ext
        )
    else:
        path_cover_s, path_cover_l = await fs_resource_handler.get_cover(
            entity=_added_collection,
            overwrite=True,
            url_cover=_added_collection.url_cover,
        )

    _added_collection.path_cover_s = path_cover_s
    _added_collection.path_cover_l = path_cover_l

    # Update the collection with the cover path and update database
    created_collection = db_collection_handler.update_collection(
        _added_collection.id,
        {
            "path_cover_s": path_cover_s,
            "path_cover_l": path_cover_l,
        },
    )

    return CollectionSchema.model_validate(created_collection)


@protected_route(router.post, "/smart", [Scope.COLLECTIONS_WRITE])
async def add_smart_collection(
    request: Request, is_public: bool | None = None
) -> SmartCollectionSchema:
    """Create smart collection endpoint

    Args:
        request (Request): Fastapi Request object

    Returns:
        SmartCollectionSchema: Just created smart collection
    """

    data = await request.form()

    # Parse filter criteria from JSON string
    try:
        filter_criteria = json.loads(str(data.get("filter_criteria", "{}")))
    except json.JSONDecodeError as e:
        raise ValueError("Invalid JSON for filter_criteria field") from e

    cleaned_data = {
        "name": str(data.get("name", "")),
        "description": str(data.get("description", "")),
        "filter_criteria": filter_criteria,
        "is_public": is_public if is_public is not None else False,
        "user_id": request.user.id,
    }

    db_smart_collection = db_collection_handler.get_smart_collection_by_name(
        cleaned_data["name"], request.user.id
    )

    if db_smart_collection:
        raise CollectionAlreadyExistsException(cleaned_data["name"])

    created_smart_collection = db_collection_handler.add_smart_collection(
        SmartCollection(**cleaned_data)
    )

    # Fetch the ROMs to update the database model
    smart_collection = created_smart_collection.update_properties(request.user.id)

    return SmartCollectionSchema.model_validate(smart_collection)


@protected_route(router.get, "", [Scope.COLLECTIONS_READ])
def get_collections(request: Request) -> list[CollectionSchema]:
    """Get collections endpoint

    Args:
        request (Request): Fastapi Request object
        id (int, optional): Collection id. Defaults to None.

    Returns:
        list[CollectionSchema]: List of collections
    """

    collections = db_collection_handler.get_collections()

    return CollectionSchema.for_user(request.user.id, [c for c in collections])


@protected_route(router.get, "/virtual", [Scope.COLLECTIONS_READ])
def get_virtual_collections(
    request: Request,
    type: str,
    limit: int | None = None,
) -> list[VirtualCollectionSchema]:
    """Get virtual collections endpoint

    Args:
        request (Request): Fastapi Request object

    Returns:
        list[VirtualCollectionSchema]: List of virtual collections
    """

    virtual_collections = db_collection_handler.get_virtual_collections(type, limit)

    return [VirtualCollectionSchema.model_validate(vc) for vc in virtual_collections]


@protected_route(router.get, "/smart", [Scope.COLLECTIONS_READ])
def get_smart_collections(request: Request) -> list[SmartCollectionSchema]:
    """Get smart collections endpoint

    Args:
        request (Request): Fastapi Request object

    Returns:
        list[SmartCollectionSchema]: List of smart collections
    """

    smart_collections = db_collection_handler.get_smart_collections(request.user.id)

    return SmartCollectionSchema.for_user(
        request.user.id, [s for s in smart_collections]
    )


@protected_route(router.get, "/{id}", [Scope.COLLECTIONS_READ])
def get_collection(request: Request, id: int) -> CollectionSchema:
    """Get collections endpoint

    Args:
        request (Request): Fastapi Request object
        id (int, optional): Collection id. Defaults to None.

    Returns:
        CollectionSchema: Collection
    """

    collection = db_collection_handler.get_collection(id)
    if not collection:
        raise CollectionNotFoundInDatabaseException(id)

    if collection.user_id != request.user.id and not collection.is_public:
        raise CollectionPermissionError(id)
    
    return CollectionSchema.model_validate(collection)


@protected_route(router.get, "/virtual/{id}", [Scope.COLLECTIONS_READ])
def get_virtual_collection(request: Request, id: str) -> VirtualCollectionSchema:
    """Get virtual collections endpoint

    Args:
        request (Request): Fastapi Request object
        id (str): Virtual collection id

    Returns:
        VirtualCollectionSchema: Virtual collection
    """

    virtual_collection = db_collection_handler.get_virtual_collection(id)
    if not virtual_collection:
        raise CollectionNotFoundInDatabaseException(id)

    return VirtualCollectionSchema.model_validate(virtual_collection)


@protected_route(router.get, "/smart/{id}", [Scope.COLLECTIONS_READ])
def get_smart_collection(request: Request, id: int) -> SmartCollectionSchema:
    """Get smart collection endpoint

    Args:
        request (Request): Fastapi Request object
        id (int): Smart collection id

    Returns:
        SmartCollectionSchema: Smart collection
    """

    smart_collection = db_collection_handler.get_smart_collection(id)
    if not smart_collection:
        raise CollectionNotFoundInDatabaseException(id)

    if smart_collection.user_id != request.user.id and not smart_collection.is_public:
        raise CollectionPermissionError(id)

    return SmartCollectionSchema.model_validate(smart_collection)


@protected_route(router.put, "/{id}", [Scope.COLLECTIONS_WRITE])
async def update_collection(
    request: Request,
    id: int,
    remove_cover: bool = False,
    is_public: bool | None = None,
    artwork: UploadFile | None = None,
) -> CollectionSchema:
    """Update collection endpoint

    Args:
        request (Request): Fastapi Request object

    Returns:
        CollectionSchema: Updated collection
    """

    data = await request.form()

    collection = db_collection_handler.get_collection(id)
    if not collection:
        raise CollectionNotFoundInDatabaseException(id)

    if collection.user_id != request.user.id:
        raise CollectionPermissionError(id)

    if not collection:
        raise CollectionNotFoundInDatabaseException(id)

    try:
        rom_ids = json.loads(data["rom_ids"])  # type: ignore
    except json.JSONDecodeError as e:
        raise ValueError("Invalid list for rom_ids field in update collection") from e

    cleaned_data = {
        "name": data.get("name", collection.name),
        "description": data.get("description", collection.description),
        "is_public": is_public if is_public is not None else collection.is_public,
        "user_id": request.user.id,
    }

    if remove_cover:
        cleaned_data.update(await fs_resource_handler.remove_cover(collection))
        cleaned_data.update({"url_cover": ""})
    else:
        if artwork is not None and artwork.filename is not None:
            file_ext = artwork.filename.split(".")[-1]
            artwork_content = BytesIO(await artwork.read())
            (
                path_cover_l,
                path_cover_s,
            ) = await fs_resource_handler.store_artwork(
                collection, artwork_content, file_ext
            )

            cleaned_data.update(
                {
                    "url_cover": "",
                    "path_cover_s": path_cover_s,
                    "path_cover_l": path_cover_l,
                }
            )
        else:
            if data.get(
                "url_cover", ""
            ) != collection.url_cover or not fs_resource_handler.cover_exists(
                collection, CoverSize.BIG
            ):
                path_cover_s, path_cover_l = await fs_resource_handler.get_cover(
                    entity=collection,
                    overwrite=True,
                    url_cover=data.get("url_cover", ""),  # type: ignore
                )
                cleaned_data.update(
                    {
                        "url_cover": data.get("url_cover", collection.url_cover),
                        "path_cover_s": path_cover_s,
                        "path_cover_l": path_cover_l,
                    }
                )

    updated_collection = db_collection_handler.update_collection(
        id, cleaned_data, rom_ids
    )

    return CollectionSchema.model_validate(updated_collection)


@protected_route(router.put, "/smart/{id}", [Scope.COLLECTIONS_WRITE])
async def update_smart_collection(
    request: Request,
    id: int,
    is_public: bool | None = None,
) -> SmartCollectionSchema:
    """Update smart collection endpoint

    Args:
        request (Request): Fastapi Request object
        id (int): Smart collection id

    Returns:
        SmartCollectionSchema: Updated smart collection
    """

    data = await request.form()

    smart_collection = db_collection_handler.get_smart_collection(id)
    if not smart_collection:
        raise CollectionNotFoundInDatabaseException(id)

    if smart_collection.user_id != request.user.id:
        raise CollectionPermissionError(id)

    # Parse filter criteria if provided
    filter_criteria = smart_collection.filter_criteria
    if "filter_criteria" in data:
        try:
            filter_criteria = json.loads(str(data["filter_criteria"]))
        except json.JSONDecodeError as e:
            raise ValueError("Invalid JSON for filter_criteria field") from e

    cleaned_data = {
        "name": str(data.get("name", smart_collection.name)),
        "description": str(data.get("description", smart_collection.description)),
        "filter_criteria": filter_criteria,
        "is_public": is_public if is_public is not None else smart_collection.is_public,
        "user_id": request.user.id,
    }

    updated_smart_collection = db_collection_handler.update_smart_collection(
        id, cleaned_data
    )

    # Fetch the ROMs to update the database model
    smart_collection = updated_smart_collection.update_properties(request.user.id)

    return SmartCollectionSchema.model_validate(smart_collection)


@protected_route(
    router.delete,
    "/{id}",
    [Scope.COLLECTIONS_WRITE],
    responses={status.HTTP_404_NOT_FOUND: {}},
)
async def delete_collection(
    request: Request,
    id: Annotated[int, PathVar(description="Collection internal id.", ge=1)],
) -> None:
    """Delete a collection by ID."""
    collection = db_collection_handler.get_collection(id)
    if not collection:
        raise CollectionNotFoundInDatabaseException(id)
    
    if collection.user_id != request.user.id:
        raise CollectionPermissionError(id)

    log.info(f"Deleting {hl(collection.name, color=BLUE)} from database")
    db_collection_handler.delete_collection(id)

    try:
        await fs_resource_handler.remove_directory(collection.fs_resources_path)
    except FileNotFoundError:
        log.error(
            f"Couldn't find resources to delete for {hl(collection.name, color=BLUE)}"
        )


@protected_route(
    router.delete,
    "/smart/{id}",
    [Scope.COLLECTIONS_WRITE],
    responses={status.HTTP_404_NOT_FOUND: {}},
)
async def delete_smart_collection(
    request: Request,
    id: Annotated[int, PathVar(description="Smart collection internal id.", ge=1)],
) -> None:
    """Delete a smart collection by ID."""
    smart_collection = db_collection_handler.get_smart_collection(id)
    if not smart_collection:
        raise CollectionNotFoundInDatabaseException(id)

    if smart_collection.user_id != request.user.id:
        raise CollectionPermissionError(id)

    log.info(f"Deleting {hl(smart_collection.name, color=BLUE)} from database")
    db_collection_handler.delete_smart_collection(id)