import gradio as gr
from PIL import Image
import os
import tempfile
from typing import List

def create_gif(
    image_files: List[str],  # 修改为直接接收文件路径列表
    scale: float = 1.0,
    frame_duration: int = 200,
    loop: bool = True
) -> tuple:
    """
    将多张图片合并为GIF动画
    
    参数:
    image_files: 图片文件路径列表
    scale: 缩放比例(0.1-2.0)
    frame_duration: 每帧持续时间(毫秒)
    loop: 是否循环播放
    
    返回:
    (输出路径, 错误信息)
    """
    try:
        # 验证输入
        if not image_files:
            return None, "错误: 请至少选择一张图片*(Wrong, At least choose one image)"
        
        images = []
        for file_info in image_files:
            path = file_info if isinstance(file_info, str) else file_info.name  # 处理两种输入方式
            if not os.path.exists(path):
                return None, f"错误: 文件不存在 - {path}"
            
            valid_ext = ('.jpg', '.jpeg', '.png', '.webp')
            if not path.lower().endswith(valid_ext):
                return None, f"错误: 不支持的文件格式 - {path}"
            
            img = Image.open(path)
            if scale != 1.0:
                new_size = (int(img.width * scale), int(img.height * scale))
                img = img.resize(new_size, Image.LANCZOS)
            images.append(img)
        
        # 设置输出路径
        output_dir = tempfile.gettempdir()
        output_path = os.path.join(output_dir, "output.gif")
        
        # 保存为GIF
        images[0].save(
            output_path,
            save_all=True,
            append_images=images[1:],
            duration=frame_duration,
            loop=0 if loop else 1,
            optimize=True
        )
        
        return output_path, "GIF创建成功!(GIF already here)"
    
    except Exception as e:
        return None, f"错误: {str(e)}"

# Gradio界面
with gr.Blocks(title="多图转GIF转换器(image2Gif)") as demo:
    gr.Markdown("## 🎞️ 多图转GIF转换器I2GIF")
    gr.Markdown("上传多张图片，设置参数后生成GIF动画格式图片，需要统一大小(upload your images to make GIF)")
    
    with gr.Row():
        with gr.Column():
            file_input = gr.Files(
                label="选择多张图片(choose images in same size)",
                file_types=["image"],
                file_count="multiple"
            )
            with gr.Accordion("高级选项(Advanced)", open=False):
                scale_slider = gr.Slider(0.1, 2.0, value=1.0, step=0.1, label="缩放比例(scale)")
                duration_slider = gr.Slider(50, 2000, value=200, step=50, label="每帧时长(毫秒)(ms per frame)")
                loop_checkbox = gr.Checkbox(value=True, label="循环播放(loop)")
            convert_btn = gr.Button("生成GIF(Merge GIF)", variant="primary")
            
        with gr.Column():
            output_gif = gr.Image(label="生成的GIF", interactive=False)
            output_download = gr.File(label="下载GIF", visible=False)
            output_message = gr.Textbox(label="状态信息", interactive=False)
    
    # 处理转换
    def process_files(
        files: List,  # 修改为普通List类型
        scale: float,
        duration: int,
        loop: bool
    ) -> tuple:
        if not files:
            return None, None, "请先上传图片*(Please upload your images first)"
        
        output_path, msg = create_gif(files, scale=scale, frame_duration=duration, loop=loop)
        
        if output_path:
            return output_path, output_path, msg
        else:
            return None, None, msg
    
    convert_btn.click(
        process_files,
        inputs=[file_input, scale_slider, duration_slider, loop_checkbox],
        outputs=[output_gif, output_download, output_message]
    )

# 启动应用
if __name__ == "__main__":
    demo.launch()