import os
import glob
import gradio as gr

def list_dirs(path: str):
    if not os.path.isdir(path):
        return []
    return sorted([d for d in os.listdir(path) if os.path.isdir(os.path.join(path, d))])

def list_mp4s(path: str):
    return sorted(glob.glob(os.path.join(path, "*.mp4")))

def refresh_chunks(root_dir: str):
    root_dir = root_dir.strip()
    chunks = [d for d in list_dirs(root_dir) if d.startswith("chunk_")]
    # 初始化时顺带给出默认 chunk / id / shot
    default_chunk = chunks[0] if chunks else None
    return gr.Dropdown(choices=chunks, value=default_chunk)

def refresh_ids(root_dir: str, chunk: str):
    root_dir = root_dir.strip()
    chunk = (chunk or "").strip()
    if not chunk:
        return gr.Dropdown(choices=[], value=None)

    chunk_path = os.path.join(root_dir, chunk)
    ids = list_dirs(chunk_path)
    default_id = ids[0] if ids else None
    # filterable=True 允许搜索过滤
    return gr.Dropdown(choices=ids, value=default_id, filterable=True)

def refresh_shots(root_dir: str, chunk: str, sample_id: str):
    root_dir = root_dir.strip()
    chunk = (chunk or "").strip()
    sample_id = (sample_id or "").strip()

    if not (chunk and sample_id):
        return gr.Dropdown(choices=[], value=None)

    id_path = os.path.join(root_dir, chunk, sample_id)
    shots = list_dirs(id_path)  # 你这里 shot 目录一般是 "0" 这样的
    default_shot = shots[0] if shots else None
    return gr.Dropdown(choices=shots, value=default_shot)

def load_videos(root_dir: str, chunk: str, sample_id: str, shot: str):
    root_dir = root_dir.strip()
    chunk = (chunk or "").strip()
    sample_id = (sample_id or "").strip()
    shot = (shot or "").strip().strip("/")

    target_dir = os.path.join(root_dir, chunk, sample_id, shot)

    if not os.path.isdir(target_dir):
        msg = f"目录不存在：{target_dir}"
        return (msg, None, None, None, None)

    mp4s = list_mp4s(target_dir)
    if not mp4s:
        msg = f"目录下没有 mp4：{target_dir}"
        return (msg, None, None, None, None)

    mp4s = mp4s[:4]
    msg = (
        f"目录：{target_dir}\n"
        f"找到 {len(mp4s)} 个视频：\n" +
        "\n".join([os.path.basename(p) for p in mp4s])
    )

    vids = mp4s + [None] * (4 - len(mp4s))
    return (msg, vids[0], vids[1], vids[2], vids[3])

with gr.Blocks(title="CI Video Viewer") as demo:
    gr.Markdown("## CI 视频浏览器（自动遍历 chunk / id / shot，4宫格展示）")

    with gr.Row():
        root_dir = gr.Textbox(value="ci_vid_SC_test", label="Root 目录（解压后的根目录）", scale=2)
        refresh_btn = gr.Button("重新扫描目录", scale=1)

    with gr.Row():
        chunk_dd = gr.Dropdown(label="chunk（下拉）", choices=[], value=None)
        id_dd = gr.Dropdown(label="id（可搜索）", choices=[], value=None, filterable=True)
        shot_dd = gr.Dropdown(label="shot（下拉）", choices=[], value=None)

    load_btn = gr.Button("加载视频", variant="primary")
    status = gr.Textbox(label="状态 / 路径 / 文件列表", lines=6)

    with gr.Row():
        v1 = gr.Video(label="video 1")
        v2 = gr.Video(label="video 2")
    with gr.Row():
        v3 = gr.Video(label="video 3")
        v4 = gr.Video(label="video 4")

    # --- 初始化：扫描 chunks，并级联更新 id、shot ---
    demo.load(
        fn=refresh_chunks,
        inputs=[root_dir],
        outputs=[chunk_dd],
    )

    # 当 chunk 变化：刷新 id
    chunk_dd.change(
        fn=refresh_ids,
        inputs=[root_dir, chunk_dd],
        outputs=[id_dd],
    )

    # 当 id 变化：刷新 shot
    id_dd.change(
        fn=refresh_shots,
        inputs=[root_dir, chunk_dd, id_dd],
        outputs=[shot_dd],
    )

    # 也允许当 chunk 变化后，shot 也跟着刷新（因为默认 id 会变）
    id_dd.change(
        fn=refresh_shots,
        inputs=[root_dir, chunk_dd, id_dd],
        outputs=[shot_dd],
    )

    # 手动重新扫描（root_dir 变了也可点）
    def full_refresh(root_dir_val: str):
        # 返回三个下拉的更新（chunk、id、shot）
        chunk_update = refresh_chunks(root_dir_val)
        # 取 chunk_update 的 value 需要在运行时拿不到对象内部；所以在这里重新算一次默认值
        chunks = [d for d in list_dirs(root_dir_val.strip()) if d.startswith("chunk_")]
        default_chunk = chunks[0] if chunks else None
        id_update = refresh_ids(root_dir_val, default_chunk) if default_chunk else gr.Dropdown(choices=[], value=None)
        ids = list_dirs(os.path.join(root_dir_val.strip(), default_chunk)) if default_chunk else []
        default_id = ids[0] if ids else None
        shot_update = refresh_shots(root_dir_val, default_chunk, default_id) if (default_chunk and default_id) else gr.Dropdown(choices=[], value=None)
        return chunk_update, id_update, shot_update

    refresh_btn.click(
        fn=full_refresh,
        inputs=[root_dir],
        outputs=[chunk_dd, id_dd, shot_dd],
    )

    # 加载视频
    load_btn.click(
        fn=load_videos,
        inputs=[root_dir, chunk_dd, id_dd, shot_dd],
        outputs=[status, v1, v2, v3, v4],
    )

if __name__ == "__main__":
    demo.launch(
        server_name="0.0.0.0",   # 允许局域网/远程访问
        server_port=8384,
        share=True
    )