"""
Image 任务处理器
===============

管理 Kling 图片生成的提交、轮询、下载。
不占用 Kling Video/Avatar 槽位，使用独立的图片槽位池。
"""

import logging
from pathlib import Path
from typing import Any

import aiohttp

from app.ai.providers.klingai_provider import KlingAIProvider
from app.config import get_settings
from app.core.config_loader import get_config_loader
from app.scheduler.handlers.base import AsyncHandler
from app.scheduler.models import StateChange
from app.scheduler.registry import JobRegistry
from app.scheduler.slot_manager import SlotManager

logger = logging.getLogger(__name__)

SLOT_KEY = "kling:image_slots"
MAX_SLOTS = 9


class ImageHandler(AsyncHandler):
    name = "image"
    slot_key = SLOT_KEY
    max_slots = MAX_SLOTS

    async def _get_provider(self) -> KlingAIProvider:
        settings = get_settings()
        config_loader = get_config_loader()
        platform = config_loader.get_platform("klingai")
        return KlingAIProvider(
            {
                "access_key": settings.KLINGAI_ACCESS_KEY or "",
                "secret_key": settings.KLINGAI_SECRET_KEY or "",
                "base_url": platform.base_url if platform else "https://api-beijing.klingai.com",
            }
        )

    async def tick(
        self, jobs: list[Any], registry: JobRegistry, slots: SlotManager
    ) -> list[StateChange]:
        changes: list[StateChange] = []
        provider = await self._get_provider()

        for job in jobs:
            params = job.params or {}
            provider_task_id = params.get("provider_task_id")
            project_id = params.get("project_id", "")
            prompt = params.get("prompt", "")
            image_type = params.get("image_type", "cover")

            if provider_task_id:
                # 轮询状态
                try:
                    result = await provider.get_image_task(provider_task_id)
                    status = result.get("task_status", "unknown")
                except Exception as e:
                    logger.error(f"[Image {job.job_id}] poll error: {e}")
                    continue

                if status in ("processing", "submitted"):
                    continue

                if status == "failed":
                    await slots.release(SLOT_KEY, job.job_id)
                    error_msg = result.get("task_status_msg", "图片生成失败")
                    changes.append(
                        StateChange(job_id=job.job_id, field_path="status", value="failed")
                    )
                    changes.append(
                        StateChange(job_id=job.job_id, field_path="message", value=error_msg)
                    )
                    changes.append(
                        StateChange(job_id=job.job_id, field_path="error", value=error_msg)
                    )
                    continue

                # succeed
                images = result.get("task_result", {}).get("images", [])
                if not images:
                    await slots.release(SLOT_KEY, job.job_id)
                    changes.append(
                        StateChange(job_id=job.job_id, field_path="status", value="failed")
                    )
                    changes.append(
                        StateChange(
                            job_id=job.job_id,
                            field_path="message",
                            value="图片生成成功但未返回图片",
                        )
                    )
                    continue

                image_url = images[0].get("url")
                image_dir = (
                    Path.home() / "Documents" / "Meijiaka" / "projects" / project_id / "images"
                )
                image_dir.mkdir(parents=True, exist_ok=True)
                ext = ".jpg" if ".jpg" in image_url else ".png"
                local_path = image_dir / f"{image_type}_{job.job_id[:8]}{ext}"

                try:
                    async with aiohttp.ClientSession() as session, session.get(image_url) as resp:
                        resp.raise_for_status()
                        local_path.write_bytes(await resp.read())
                except Exception as e:
                    await slots.release(SLOT_KEY, job.job_id)
                    changes.append(
                        StateChange(job_id=job.job_id, field_path="status", value="failed")
                    )
                    changes.append(
                        StateChange(
                            job_id=job.job_id, field_path="message", value=f"图片下载失败: {e}"
                        )
                    )
                    continue

                await slots.release(SLOT_KEY, job.job_id)
                result_data = {
                    "project_id": project_id,
                    "image_type": image_type,
                    "local_path": str(local_path),
                    "prompt": prompt,
                }
                changes.append(
                    StateChange(job_id=job.job_id, field_path="status", value="completed")
                )
                changes.append(
                    StateChange(job_id=job.job_id, field_path="message", value="图片生成完成")
                )
                changes.append(StateChange(job_id=job.job_id, field_path="completed", value=1))
                changes.append(StateChange(job_id=job.job_id, field_path="total", value=1))
                changes.append(
                    StateChange(job_id=job.job_id, field_path="result", value=result_data)
                )
                continue

            # 提交新任务
            acquired = await slots.acquire(SLOT_KEY, job.job_id, MAX_SLOTS)
            if not acquired:
                continue

            try:
                reference_image = params.get("reference_image")
                human_id = params.get("human_id")
                if reference_image:
                    result = await provider.generate_image(
                        prompt=prompt,
                        image_url=reference_image,
                        model="kling-v3",
                    )
                elif human_id:
                    result = await provider.generate_image(
                        prompt=prompt,
                        model="kling-v3",
                        aspect_ratio="9:16",
                    )
                else:
                    result = await provider.generate_image(
                        prompt=prompt,
                        model="kling-v3",
                        aspect_ratio="9:16",
                    )

                provider_task_id = result.get("task_id")
                if not provider_task_id:
                    raise ValueError("未返回任务ID")
                params["provider_task_id"] = provider_task_id
                changes.append(StateChange(job_id=job.job_id, field_path="params", value=params))
                changes.append(
                    StateChange(job_id=job.job_id, field_path="message", value="图片任务已提交")
                )
            except Exception as e:
                await slots.release(SLOT_KEY, job.job_id)
                changes.append(StateChange(job_id=job.job_id, field_path="status", value="failed"))
                changes.append(
                    StateChange(job_id=job.job_id, field_path="message", value=str(e)[:200])
                )
                changes.append(
                    StateChange(job_id=job.job_id, field_path="error", value=str(e)[:500])
                )

        return changes