import io
import json
import zipfile
from datetime import datetime, timezone
from typing import Annotated

import orjson
from fastapi import APIRouter, Depends, File, HTTPException, Response, UploadFile, status
from fastapi.encoders import jsonable_encoder
from fastapi.responses import StreamingResponse
from fastapi_pagination import Params
from fastapi_pagination.ext.sqlmodel import paginate
from sqlalchemy import or_, update
from sqlalchemy.orm import selectinload
from sqlmodel import select

from langflow.api.utils import CurrentActiveUser, DbSession, cascade_delete_flow, custom_params, remove_api_keys
from langflow.api.v1.flows import create_flows
from langflow.api.v1.schemas import FlowListCreate
from langflow.helpers.flow import generate_unique_flow_name
from langflow.helpers.folders import generate_unique_folder_name
from langflow.initial_setup.constants import STARTER_FOLDER_NAME
from langflow.services.database.models.flow.model import Flow, FlowCreate, FlowRead
from langflow.services.database.models.folder.constants import DEFAULT_FOLDER_NAME
from langflow.services.database.models.folder.model import (
    Folder,
    FolderCreate,
    FolderRead,
    FolderReadWithFlows,
    FolderUpdate,
)
from langflow.services.database.models.folder.pagination_model import FolderWithPaginatedFlows

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


@router.post("/", response_model=FolderRead, status_code=201)
async def create_folder(
    *,
    session: DbSession,
    folder: FolderCreate,
    current_user: CurrentActiveUser,
):
    try:
        new_folder = Folder.model_validate(folder, from_attributes=True)
        new_folder.user_id = current_user.id
        # First check if the folder.name is unique
        # there might be flows with name like: "MyFlow", "MyFlow (1)", "MyFlow (2)"
        # so we need to check if the name is unique with `like` operator
        # if we find a flow with the same name, we add a number to the end of the name
        # based on the highest number found
        if (
            await session.exec(
                statement=select(Folder).where(Folder.name == new_folder.name).where(Folder.user_id == current_user.id)
            )
        ).first():
            folder_results = await session.exec(
                select(Folder).where(
                    Folder.name.like(f"{new_folder.name}%"),  # type: ignore[attr-defined]
                    Folder.user_id == current_user.id,
                )
            )
            if folder_results:
                folder_names = [folder.name for folder in folder_results]
                folder_numbers = [int(name.split("(")[-1].split(")")[0]) for name in folder_names if "(" in name]
                if folder_numbers:
                    new_folder.name = f"{new_folder.name} ({max(folder_numbers) + 1})"
                else:
                    new_folder.name = f"{new_folder.name} (1)"

        session.add(new_folder)
        await session.commit()
        await session.refresh(new_folder)

        if folder.components_list:
            update_statement_components = (
                update(Flow).where(Flow.id.in_(folder.components_list)).values(folder_id=new_folder.id)  # type: ignore[attr-defined]
            )
            await session.exec(update_statement_components)
            await session.commit()

        if folder.flows_list:
            update_statement_flows = update(Flow).where(Flow.id.in_(folder.flows_list)).values(folder_id=new_folder.id)  # type: ignore[attr-defined]
            await session.exec(update_statement_flows)
            await session.commit()

    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e)) from e

    return new_folder


@router.get("/", response_model=list[FolderRead], status_code=200)
async def read_folders(
    *,
    session: DbSession,
    current_user: CurrentActiveUser,
):
    try:
        folders = (
            await session.exec(
                select(Folder).where(
                    or_(Folder.user_id == current_user.id, Folder.user_id == None)  # noqa: E711
                )
            )
        ).all()
        folders = [folder for folder in folders if folder.name != STARTER_FOLDER_NAME]
        return sorted(folders, key=lambda x: x.name != DEFAULT_FOLDER_NAME)
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e)) from e


@router.get("/{folder_id}", response_model=FolderWithPaginatedFlows | FolderReadWithFlows, status_code=200)
async def read_folder(
    *,
    session: DbSession,
    folder_id: str,
    current_user: CurrentActiveUser,
    params: Annotated[Params | None, Depends(custom_params)],
    is_component: bool = False,
    is_flow: bool = False,
    search: str = "",
):
    try:
        folder = (
            await session.exec(
                select(Folder)
                .options(selectinload(Folder.flows))
                .where(Folder.id == folder_id, Folder.user_id == current_user.id)
            )
        ).first()
    except Exception as e:
        if "No result found" in str(e):
            raise HTTPException(status_code=404, detail="Folder not found") from e
        raise HTTPException(status_code=500, detail=str(e)) from e

    if not folder:
        raise HTTPException(status_code=404, detail="Folder not found")

    try:
        if params and params.page and params.size:
            stmt = select(Flow).where(Flow.folder_id == folder_id)

            if Flow.updated_at is not None:
                stmt = stmt.order_by(Flow.updated_at.desc())  # type: ignore[attr-defined]
            if is_component:
                stmt = stmt.where(Flow.is_component == True)  # noqa: E712
            if is_flow:
                stmt = stmt.where(Flow.is_component == False)  # noqa: E712
            if search:
                stmt = stmt.where(Flow.name.like(f"%{search}%"))  # type: ignore[attr-defined]
            paginated_flows = await paginate(session, stmt, params=params)

            return FolderWithPaginatedFlows(folder=FolderRead.model_validate(folder), flows=paginated_flows)

    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e)) from e

    flows_from_current_user_in_folder = [flow for flow in folder.flows if flow.user_id == current_user.id]
    folder.flows = flows_from_current_user_in_folder
    return folder


@router.patch("/{folder_id}", response_model=FolderRead, status_code=200)
async def update_folder(
    *,
    session: DbSession,
    folder_id: str,
    folder: FolderUpdate,  # Assuming FolderUpdate is a Pydantic model defining updatable fields
    current_user: CurrentActiveUser,
):
    try:
        existing_folder = (
            await session.exec(select(Folder).where(Folder.id == folder_id, Folder.user_id == current_user.id))
        ).first()
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e)) from e

    if not existing_folder:
        raise HTTPException(status_code=404, detail="Folder not found")

    try:
        if folder.name and folder.name != existing_folder.name:
            existing_folder.name = folder.name
            session.add(existing_folder)
            await session.commit()
            await session.refresh(existing_folder)
            return existing_folder

        folder_data = existing_folder.model_dump(exclude_unset=True)
        for key, value in folder_data.items():
            if key not in {"components", "flows"}:
                setattr(existing_folder, key, value)
        session.add(existing_folder)
        await session.commit()
        await session.refresh(existing_folder)

        concat_folder_components = folder.components + folder.flows

        flows_ids = (await session.exec(select(Flow.id).where(Flow.folder_id == existing_folder.id))).all()

        excluded_flows = list(set(flows_ids) - set(concat_folder_components))

        my_collection_folder = (await session.exec(select(Folder).where(Folder.name == DEFAULT_FOLDER_NAME))).first()
        if my_collection_folder:
            update_statement_my_collection = (
                update(Flow).where(Flow.id.in_(excluded_flows)).values(folder_id=my_collection_folder.id)  # type: ignore[attr-defined]
            )
            await session.exec(update_statement_my_collection)
            await session.commit()

        if concat_folder_components:
            update_statement_components = (
                update(Flow).where(Flow.id.in_(concat_folder_components)).values(folder_id=existing_folder.id)  # type: ignore[attr-defined]
            )
            await session.exec(update_statement_components)
            await session.commit()

    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e)) from e

    return existing_folder


@router.delete("/{folder_id}", status_code=204)
async def delete_folder(
    *,
    session: DbSession,
    folder_id: str,
    current_user: CurrentActiveUser,
):
    try:
        flows = (
            await session.exec(select(Flow).where(Flow.folder_id == folder_id, Flow.user_id == current_user.id))
        ).all()
        if len(flows) > 0:
            for flow in flows:
                await cascade_delete_flow(session, flow.id)

        folder = (
            await session.exec(select(Folder).where(Folder.id == folder_id, Folder.user_id == current_user.id))
        ).first()
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e)) from e

    if not folder:
        raise HTTPException(status_code=404, detail="Folder not found")

    try:
        await session.delete(folder)
        await session.commit()
        return Response(status_code=status.HTTP_204_NO_CONTENT)
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e)) from e


@router.get("/download/{folder_id}", status_code=200)
async def download_file(
    *,
    session: DbSession,
    folder_id: str,
    current_user: CurrentActiveUser,
):
    """Download all flows from folder as a zip file."""
    try:
        query = select(Folder).where(Folder.id == folder_id, Folder.user_id == current_user.id)
        result = await session.exec(query)
        folder = result.first()

        if not folder:
            raise HTTPException(status_code=404, detail="Folder not found")

        flows_query = select(Flow).where(Flow.folder_id == folder_id)
        flows_result = await session.exec(flows_query)
        flows = [FlowRead.model_validate(flow, from_attributes=True) for flow in flows_result.all()]

        if not flows:
            raise HTTPException(status_code=404, detail="No flows found in folder")

        flows_without_api_keys = [remove_api_keys(flow.model_dump()) for flow in flows]
        zip_stream = io.BytesIO()

        with zipfile.ZipFile(zip_stream, "w") as zip_file:
            for flow in flows_without_api_keys:
                flow_json = json.dumps(jsonable_encoder(flow))
                zip_file.writestr(f"{flow['name']}.json", flow_json)

        zip_stream.seek(0)

        current_time = datetime.now(tz=timezone.utc).astimezone().strftime("%Y%m%d_%H%M%S")
        filename = f"{current_time}_{folder.name}_flows.zip"

        return StreamingResponse(
            zip_stream,
            media_type="application/x-zip-compressed",
            headers={"Content-Disposition": f"attachment; filename={filename}"},
        )

    except Exception as e:
        if "No result found" in str(e):
            raise HTTPException(status_code=404, detail="Folder not found") from e
        raise HTTPException(status_code=500, detail=str(e)) from e


@router.post("/upload/", response_model=list[FlowRead], status_code=201)
async def upload_file(
    *,
    session: DbSession,
    file: Annotated[UploadFile, File(...)],
    current_user: CurrentActiveUser,
):
    """Upload flows from a file."""
    contents = await file.read()
    data = orjson.loads(contents)

    if not data:
        raise HTTPException(status_code=400, detail="No flows found in the file")

    folder_name = await generate_unique_folder_name(data["folder_name"], current_user.id, session)

    data["folder_name"] = folder_name

    folder = FolderCreate(name=data["folder_name"], description=data["folder_description"])

    new_folder = Folder.model_validate(folder, from_attributes=True)
    new_folder.id = None
    new_folder.user_id = current_user.id
    session.add(new_folder)
    await session.commit()
    await session.refresh(new_folder)

    del data["folder_name"]
    del data["folder_description"]

    if "flows" in data:
        flow_list = FlowListCreate(flows=[FlowCreate(**flow) for flow in data["flows"]])
    else:
        raise HTTPException(status_code=400, detail="No flows found in the data")
    # Now we set the user_id for all flows
    for flow in flow_list.flows:
        flow_name = await generate_unique_flow_name(flow.name, current_user.id, session)
        flow.name = flow_name
        flow.user_id = current_user.id
        flow.folder_id = new_folder.id

    return await create_flows(session=session, flow_list=flow_list, current_user=current_user)