import gradio as gr
import pathlib
import os
import re
import shutil
from huggingface_hub import snapshot_download

#manga_video_dir = "reorganized_manga"
#manga_video_dir = "reorganized_manga_0_5"
manga_video_dir = "reorganized_manga_0_3"

# 从 Hugging Face Hub 下载数据集到当前路径
def download_dataset():
    # 定义本地目标路径
    local_path = os.path.join(os.getcwd(), manga_video_dir)
    
    # 如果目标路径已存在，先删除
    if os.path.exists(local_path):
        shutil.rmtree(local_path)
    
    # 下载数据集到缓存目录
    cache_path = snapshot_download(
        repo_id="svjack/Genshin-Impact-3d-Kenburns-Manga",
        repo_type="dataset",
        allow_patterns="{}/*".format(manga_video_dir)
    )
    
    # 将缓存目录中的 reorganized_manga 复制到当前路径
    shutil.copytree(os.path.join(cache_path, manga_video_dir), local_path)
    
    # 返回本地路径
    return local_path

# 检查本地路径是否存在且内容完整
def is_dataset_valid(local_path):
    if not os.path.exists(local_path):
        return False
    # 检查文件夹是否为空
    if not os.listdir(local_path):
        return False
    # 检查是否存在至少一个子目录
    subdirs = [d for d in os.listdir(local_path) if os.path.isdir(os.path.join(local_path, d))]
    if not subdirs:
        return False
    return True

# 初始路径
local_path = os.path.join(os.getcwd(), manga_video_dir)
if not is_dataset_valid(local_path):
    base_path = download_dataset()
else:
    base_path = local_path

# 中文数字到阿拉伯数字的映射
chinese_num_map = {
    "零": 0, "一": 1, "二": 2, "三": 3, "四": 4,
    "五": 5, "六": 6, "七": 7, "八": 8, "九": 9,
    "十": 10
}

# 将中文数字转换为阿拉伯数字
def chinese_to_arabic(chinese_num):
    if chinese_num in chinese_num_map:
        return chinese_num_map[chinese_num]
    # 处理“十一”到“十九”的情况
    if chinese_num.startswith("十"):
        return 10 + chinese_num_map.get(chinese_num[1:], 0)
    # 处理“二十”以上的情况（简单实现，仅支持两位数）
    if chinese_num.startswith("二") and chinese_num.endswith("十"):
        return 20
    return 0  # 默认值

# 加载视频文件并排序
def load_videos(path):
    # 获取所有 .mp4 文件
    video_files = list(pathlib.Path(path).rglob("*.mp4"))
    
    # 排序逻辑
    def sort_key(file):
        filename = file.name.replace(".mp4", "")
        # 无数字的文件（如“第四话扉页.mp4”）排在最前面
        if not re.search(r"\d+", filename):
            return (0, filename)
        # 提取文件名中的数值并排序
        match = re.search(r"(\d+)", filename)
        if match:
            return (1, int(match.group(1)))
        return (1, filename)
    
    # 按自定义规则排序
    video_files.sort(key=sort_key)

    print([str(video) for video in video_files])
    
    return [str(video) for video in video_files]

# 获取 reorganized_manga 的子目录并排序
def get_subdirectories():
    subdirs = [d.name for d in pathlib.Path(base_path).iterdir() if d.is_dir()]
    
    # 排序逻辑：序章在前，之后按“第几话”排序，再按“上”和“下”排序
    def sort_key(name):
        if "序章" in name:
            return (0, 0, name, 2)  # 序章优先级最高，第四列默认 2
        # 匹配中文数字（如“第一話”）
        match = re.search(r"第([零一二三四五六七八九十]+)話", name)
        if match:
            chinese_num = match.group(1)
            arabic_num = chinese_to_arabic(chinese_num)
            # 匹配“上”和“下”
            if "上" in name:
                return (1, arabic_num, name, 0)  # “上”优先级为 0
            elif "下" in name:
                return (1, arabic_num, name, 1)  # “下”优先级为 1
            else:
                return (1, arabic_num, name, 2)  # 无“上”或“下”优先级为 2
        return (2, 0, name, 2)  # 其他目录优先级最低
    
    subdirs.sort(key=sort_key)
    return subdirs

# 初始页码
current_page = 0
subdirectories = get_subdirectories()
content = load_videos(os.path.join(base_path, subdirectories[0])) if subdirectories else []

# 更新页面内容
def update_page(action):
    global current_page
    if action == "Previous Page" and current_page > 0:
        current_page -= 1
    elif action == "Next Page" and current_page < len(content) - 1:
        current_page += 1
    return content[current_page], f"Page {current_page + 1} / {len(content)}"

# 切换路径逻辑
def switch_path(new_path):
    global content, current_page
    content = load_videos(os.path.join(base_path, new_path))
    current_page = 0
    return content[current_page], f"Page {current_page + 1} / {len(content)}"

# Gradio 界面
with gr.Blocks(title="Genshin Impact 3D Kenburns Manga Viewer") as demo:
    # HTML 标题
    gr.Markdown("""
    # Genshin Impact 3D Kenburns Manga Viewer
    Explore the manga pages in a 3D Kenburns style.
    """)

    # 路径切换下拉菜单
    path_selector = gr.Dropdown(
        choices=get_subdirectories(),
        value=get_subdirectories()[0] if get_subdirectories() else None,
        label="Select Subdirectory"
    )
    
    # 显示当前页面内容
    with gr.Row():
        with gr.Column(scale=2):  # 控制宽度
            page_display = gr.Video(
                value=content[current_page] if content else None,
                label="Current Page",
                autoplay=True,  # 自动播放
                loop=True,      # 循环播放
                interactive=True,  # 允许用户交互（如调节播放速度）
                height=1024,
                width=768
            )
            
            page_info = gr.Textbox(value=f"Page {current_page + 1} / {len(content)}" if content else "No Pages", label="Page Info", interactive=False)

            # 翻页按钮
            with gr.Row():
                prev_button = gr.Button("Previous Page")
                next_button = gr.Button("Next Page")

    # 绑定按钮事件
    prev_button.click(fn=lambda: update_page("Previous Page"), outputs=[page_display, page_info])
    next_button.click(fn=lambda: update_page("Next Page"), outputs=[page_display, page_info])

    # 监听路径切换事件
    path_selector.change(
        fn=switch_path,
        inputs=path_selector,
        outputs=[page_display, page_info]
    )

# 启动应用
demo.launch(share=True)