import os
import gradio as gr
import spotipy
from spotipy.oauth2 import SpotifyOAuth
import random

REDIRECT_URI = "https://jisaacso219-rng-shuffle.hf.space/"
CLIENT_ID     = os.environ["SPOTIFY_CLIENT_ID"]
CLIENT_SECRET = os.environ["SPOTIFY_CLIENT_SECRET"]
SCOPE         = (
    "user-read-playback-state "
    "user-modify-playback-state "
    "playlist-read-private"
)

sp_oauth = SpotifyOAuth(
    client_id=CLIENT_ID,
    client_secret=CLIENT_SECRET,
    redirect_uri=REDIRECT_URI,
    scope=SCOPE,
    show_dialog=True,
)

sp = None
user_playlists = {}

def get_auth_url():
    return sp_oauth.get_authorize_url()

def check_login(code: str):
    global sp, user_playlists
    if not code:
        return gr.update(visible=False), gr.update(visible=False, choices=[])
    token = sp_oauth.get_access_token(code, as_dict=False)
    sp = spotipy.Spotify(auth=token)
    pls = sp.current_user_playlists(limit=50)["items"]
    user_playlists = {p["name"]: p["id"] for p in pls}
    return (
        gr.update(visible=True, value="✅ Logged in! Choose a playlist below."),
        gr.update(visible=True, choices=list(user_playlists.keys()))
    )

def load_playlist_info(pl_name: str):
    pid = user_playlists[pl_name]
    data = sp.playlist(pid)
    img   = data["images"][0]["url"] if data["images"] else ""
    owner = data["owner"]["display_name"]
    desc  = data.get("description", "")
    html = f"""
      <img src="{img}" width="300px" style="border-radius:10px;"/><br/>
      <strong>{pl_name}</strong> by {owner}<br/>
      {desc}
    """
    return html, gr.update(visible=True)

def shuffle_and_play(pl_name: str):
    pid = user_playlists[pl_name]
    tracks, results = [], sp.playlist_tracks(pid)
    tracks.extend(results["items"])
    while results["next"]:
        results = sp.next(results)
        tracks.extend(results["items"])

    uris = [t["track"]["uri"] for t in tracks if t["track"]]
    devices = sp.devices()["devices"]
    if not devices:
        return gr.update(value="⚠️ No active device. Open Spotify and try again.", visible=True)

    sp.start_playback(device_id=devices[0]["id"], uris=uris)
    now = sp.current_playback()
    if now and now.get("item"):
        it      = now["item"]
        art     = it["album"]["images"][0]["url"]
        title   = it["name"]
        artists = ", ".join(a["name"] for a in it["artists"])
        html = f"""
          <img src="{art}" width="200px" style="border-radius:8px;"/><br/>
          ▶️ <strong>{title}</strong><br/>
          by {artists}
        """
        return html
    return "▶️ Playing your shuffled playlist!"

with gr.Blocks() as demo:
    gr.Markdown("## 🎵 RNG Spotify Playlist Shuffler")
    gr.Markdown("Login, pick a playlist, then shuffle & play—all in one flow.")

    # Step 1: Login button using `link=` (Gradio ≥5.14.0)
    login_btn = gr.Button(
        "🔐 Step 1: Login to Spotify",
        link=get_auth_url()
    )

    # Hidden container for the ?code=… Spotify will append on redirect
    code_box  = gr.Textbox(visible=False, elem_id="auth_code")
    status    = gr.Markdown(visible=False)
    dropdown  = gr.Dropdown(choices=[], label="Step 2: Select a Playlist", visible=False)
    info_html = gr.HTML(visible=False)
    shuffle_btn = gr.Button("🔀 Step 3: Shuffle & Play", visible=False)
    result      = gr.HTML(visible=False)

    # Run on every page-load: grab ?code=… via JS and call check_login
    demo.load(
        fn=check_login,
        inputs=[code_box],
        outputs=[status, dropdown],
        js="""
          const params = new URLSearchParams(window.location.search);
          const code = params.get("code");
          if (code) {
            document
              .getElementById("component-auth_code")
              .querySelector("textarea").value = code;
          }
        """
    )

    # When user picks a playlist, show its artwork/info and reveal the shuffle button
    dropdown.change(
        fn=load_playlist_info,
        inputs=[dropdown],
        outputs=[info_html, shuffle_btn]
    )

    # Shuffle & start playback, then show track info
    shuffle_btn.click(
        fn=shuffle_and_play,
        inputs=[dropdown],
        outputs=[result]
    )

if __name__ == "__main__":
    demo.launch()