#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
根据描述词（prompt）用 imagedl 搜索并下载一张图片到指定路径。
用法: python download-img-by-prompt.py --prompt "关键词" --save-path "/path/to/out.png"
需设置 PYTHONPATH 包含 python/imagedl 的父目录（如项目根下的 python）。
输出: JSON 到 stdout，{ "success": true, "path": "..." } 或 { "success": false, "error": "..." }
"""
import os
import sys
import json
import tempfile
import shutil

def main():
    prompt = None
    save_path = None
    source = 'BaiduImageClient'
    i = 1
    while i < len(sys.argv):
        if sys.argv[i] == '--prompt' and i + 1 < len(sys.argv):
            prompt = sys.argv[i + 1]
            i += 2
        elif sys.argv[i] == '--save-path' and i + 1 < len(sys.argv):
            save_path = sys.argv[i + 1]
            i += 2
        elif sys.argv[i] == '--source' and i + 1 < len(sys.argv):
            source = sys.argv[i + 1]
            i += 2
        else:
            i += 1

    if not prompt or not save_path:
        print(json.dumps({"success": False, "error": "缺少 --prompt 或 --save-path"}))
        sys.exit(1)

    save_path = os.path.abspath(os.path.normpath(save_path))
    save_dir = os.path.dirname(save_path)
    os.makedirs(save_dir, exist_ok=True)

    # 确保能 import imagedl（由调用方设置 PYTHONPATH 或在此添加）
    imagedl_parent = os.environ.get('IMAGEDL_PARENT')
    if imagedl_parent:
        if imagedl_parent not in sys.path:
            sys.path.insert(0, imagedl_parent)

    try:
        from imagedl.imagedl.imagedl import ImageClient
    except ImportError as e:
        print(json.dumps({"success": False, "error": f"无法导入 imagedl: {e}。请设置 PYTHONPATH 或 IMAGEDL_PARENT 为 python/imagedl 的父目录（即项目下的 python）。"}))
        sys.exit(1)

    tmp_dir = tempfile.mkdtemp(prefix='imagedl_download_img_')
    try:
        client = ImageClient(
            image_source=source,
            init_image_client_cfg={'work_dir': tmp_dir, 'disable_print': True},
            search_limits=5,
            num_threadings=1
        )
        image_infos = client.search(prompt, search_limits_overrides=1, num_threadings_overrides=1)
        if not image_infos or len(image_infos) == 0:
            print(json.dumps({"success": False, "error": "未搜到任何图片"}))
            sys.exit(1)
        # 只取前几张，依次尝试下载，成功一张即用
        exts = ('.jpg', '.jpeg', '.png', '.gif', '.webp', '.bmp')
        max_try = min(5, len(image_infos))
        found = None
        for i in range(max_try):
            client.download([image_infos[i]], num_threadings_overrides=1)
            for root, _, files in os.walk(tmp_dir):
                for f in files:
                    if any(f.lower().endswith(ext) for ext in exts):
                        found = os.path.join(root, f)
                        break
                if found:
                    break
            if found:
                break
        if not found:
            print(json.dumps({"success": False, "error": "下载后未找到图片文件"}))
            sys.exit(1)
        # 若 save_path 无扩展名则沿用下载文件的扩展名
        if not os.path.splitext(save_path)[1]:
            save_path = save_path + os.path.splitext(found)[1]
        shutil.copy2(found, save_path)
        print(json.dumps({"success": True, "path": save_path}))
    except Exception as e:
        print(json.dumps({"success": False, "error": str(e)}))
        sys.exit(1)
    finally:
        shutil.rmtree(tmp_dir, ignore_errors=True)


if __name__ == '__main__':
    main()