import io
import json
import threading
from uuid import uuid4
from zipfile import ZipFile
from pathlib import Path
from typing import Optional
from gradio.routes import App
from PIL import Image
from fastapi.responses import StreamingResponse

from modules import shared, progress

from .db import TaskStatus, task_manager
from .models import (
    Txt2ImgApiTaskArgs,
    Img2ImgApiTaskArgs,
    QueueTaskResponse,
    QueueStatusResponse,
    HistoryResponse,
    TaskModel,
)
from .task_runner import TaskRunner
from .helpers import log
from .task_helpers import encode_image_to_base64, img2img_image_args_by_mode


def regsiter_apis(app: App, task_runner: TaskRunner):
    log.info("[AgentScheduler] Registering APIs")

    @app.post("/agent-scheduler/v1/queue/txt2img", response_model=QueueTaskResponse)
    def queue_txt2img(body: Txt2ImgApiTaskArgs):
        task_id = str(uuid4())
        args = body.dict()
        checkpoint = args.pop("checkpoint", None)
        task_runner.register_api_task(
            task_id,
            api_task_id=None,
            is_img2img=False,
            args=args,
            checkpoint=checkpoint,
        )
        task_runner.execute_pending_tasks_threading()

        return QueueTaskResponse(task_id=task_id)

    @app.post("/agent-scheduler/v1/queue/img2img", response_model=QueueTaskResponse)
    def queue_img2img(body: Img2ImgApiTaskArgs):
        task_id = str(uuid4())
        args = body.dict()
        checkpoint = args.pop("checkpoint", None)
        task_runner.register_api_task(
            task_id,
            api_task_id=None,
            is_img2img=True,
            args=args,
            checkpoint=checkpoint,
        )
        task_runner.execute_pending_tasks_threading()

        return QueueTaskResponse(task_id=task_id)

    def format_task_args(task):
        task_args = TaskRunner.instance.parse_task_args(task, deserialization=False)
        named_args = task_args.named_args
        named_args["checkpoint"] = task_args.checkpoint
        # remove unused args to reduce payload size
        named_args.pop("alwayson_scripts", None)
        named_args.pop("script_args", None)
        named_args.pop("init_images", None)
        for image_args in img2img_image_args_by_mode.values():
            for keys in image_args:
                named_args.pop(keys[0], None)
        return named_args

    @app.get("/agent-scheduler/v1/queue", response_model=QueueStatusResponse)
    def queue_status_api(limit: int = 20, offset: int = 0):
        current_task_id = progress.current_task
        total_pending_tasks = task_manager.count_tasks(status="pending")
        pending_tasks = task_manager.get_tasks(
            status=TaskStatus.PENDING, limit=limit, offset=offset
        )
        parsed_tasks = []
        for task in pending_tasks:
            params = format_task_args(task)
            task_data = task.dict()
            task_data["params"] = params
            if task.id == current_task_id:
                task_data["status"] = "running"

            parsed_tasks.append(TaskModel(**task_data))

        return QueueStatusResponse(
            current_task_id=current_task_id,
            pending_tasks=parsed_tasks,
            total_pending_tasks=total_pending_tasks,
            paused=TaskRunner.instance.paused,
        )

    @app.get("/agent-scheduler/v1/history", response_model=HistoryResponse)
    def history_api(status: str = None, limit: int = 20, offset: int = 0):
        bookmarked = True if status == "bookmarked" else None
        if not status or status == "all" or bookmarked:
            status = [
                TaskStatus.DONE,
                TaskStatus.FAILED,
                TaskStatus.INTERRUPTED,
            ]

        total = task_manager.count_tasks(status=status)
        tasks = task_manager.get_tasks(
            status=status,
            bookmarked=bookmarked,
            limit=limit,
            offset=offset,
            order="desc",
        )
        parsed_tasks = []
        for task in tasks:
            params = format_task_args(task)
            task_data = task.dict()
            task_data["params"] = params
            parsed_tasks.append(TaskModel(**task_data))

        return HistoryResponse(
            total=total,
            tasks=parsed_tasks,
        )

    @app.post("/agent-scheduler/v1/run/{id}")
    def run_task(id: str):
        if progress.current_task is not None:
            if progress.current_task == id:
                return {"success": False, "message": "Task is running"}
            else:
                # move task up in queue
                task_manager.prioritize_task(id, 0)
                return {
                    "success": True,
                    "message": "Task is scheduled to run next",
                }
        else:
            # run task
            task = task_manager.get_task(id)
            current_thread = threading.Thread(
                target=TaskRunner.instance.execute_task,
                args=(
                    task,
                    lambda: None,
                ),
            )
            current_thread.daemon = True
            current_thread.start()

            return {"success": True, "message": "Task is executing"}

    @app.post("/agent-scheduler/v1/requeue/{id}")
    def requeue_task(id: str):
        task = task_manager.get_task(id)
        if task is None:
            return {"success": False, "message": "Task not found"}

        task.id = str(uuid4())
        task.result = None
        task.status = TaskStatus.PENDING
        task.bookmarked = False
        task.name = f"Copy of {task.name}" if task.name else None
        task_manager.add_task(task)
        task_runner.execute_pending_tasks_threading()

        return {"success": True, "message": "Task requeued"}

    @app.post("/agent-scheduler/v1/delete/{id}")
    def delete_task(id: str):
        if progress.current_task == id:
            shared.state.interrupt()
            task_runner.interrupted = id
            return {"success": True, "message": "Task interrupted"}

        task_manager.delete_task(id)
        return {"success": True, "message": "Task deleted"}

    @app.post("/agent-scheduler/v1/move/{id}/{over_id}")
    def move_task(id: str, over_id: str):
        task = task_manager.get_task(id)
        if task is None:
            return {"success": False, "message": "Task not found"}

        if over_id == "top":
            task_manager.prioritize_task(id, 0)
            return {"success": True, "message": "Task moved to top"}
        elif over_id == "bottom":
            task_manager.prioritize_task(id, -1)
            return {"success": True, "message": "Task moved to bottom"}
        else:
            over_task = task_manager.get_task(over_id)
            if over_task is None:
                return {"success": False, "message": "Task not found"}

            task_manager.prioritize_task(id, over_task.priority)
            return {"success": True, "message": "Task moved"}

    @app.post("/agent-scheduler/v1/bookmark/{id}")
    def pin_task(id: str):
        task = task_manager.get_task(id)
        if task is None:
            return {"success": False, "message": "Task not found"}

        task.bookmarked = True
        task_manager.update_task(id, bookmarked=True)
        return {"success": True, "message": "Task bookmarked"}

    @app.post("/agent-scheduler/v1/unbookmark/{id}")
    def unpin_task(id: str):
        task = task_manager.get_task(id)
        if task is None:
            return {"success": False, "message": "Task not found"}

        task_manager.update_task(id, bookmarked=False)
        return {"success": True, "message": "Task unbookmarked"}

    @app.post("/agent-scheduler/v1/rename/{id}")
    def rename_task(id: str, name: str):
        task = task_manager.get_task(id)
        if task is None:
            return {"success": False, "message": "Task not found"}

        task_manager.update_task(id, name=name)
        return {"success": True, "message": "Task renamed."}

    @app.get("/agent-scheduler/v1/results/{id}")
    def get_task_results(id: str, zip: Optional[bool] = False):
        task = task_manager.get_task(id)
        if task is None:
            return {"success": False, "message": "Task not found"}

        if task.status != TaskStatus.DONE:
            return {"success": False, "message": f"Task is {task.status.value}"}

        if task.result is None:
            return {"success": False, "message": "Task result is not available"}

        result: dict = json.loads(task.result)
        infotexts = result["infotexts"]

        if zip:
            zip_buffer = io.BytesIO()

            # Create a new zip file in the in-memory buffer
            with ZipFile(zip_buffer, "w") as zip_file:
                # Loop through the files in the directory and add them to the zip file
                for image in result["images"]:
                    if Path(image).is_file():
                        zip_file.write(Path(image), Path(image).name)

            # Reset the buffer position to the beginning to avoid truncation issues
            zip_buffer.seek(0)

            # Return the in-memory buffer as a streaming response with the appropriate headers
            return StreamingResponse(
                zip_buffer,
                media_type="application/zip",
                headers={
                    "Content-Disposition": f"attachment; filename=results-{id}.zip"
                },
            )
        else:
            data = [
                {
                    "image": encode_image_to_base64(Image.open(image)),
                    "infotext": infotexts[i],
                }
                for i, image in enumerate(result["images"])
                if Path(image).is_file()
            ]

            return {"success": True, "data": data}

    @app.post("/agent-scheduler/v1/pause")
    def pause_queue():
        shared.opts.queue_paused = True
        return {"success": True, "message": "Queue paused."}

    @app.post("/agent-scheduler/v1/resume")
    def resume_queue():
        shared.opts.queue_paused = False
        TaskRunner.instance.execute_pending_tasks_threading()
        return {"success": True, "message": "Queue resumed."}