/** The album detail sheet: cover, metadata, and a numbered track list. */

import { useEffect, useRef } from "react";

import type { Album } from "../api/types";
import { isBook, unitLabel } from "../lib/covers";
import { clock } from "../lib/format";
import { ANIMATE_VIEW_TRANSITIONS } from "../lib/theme";
import { Cover } from "./Cover";

interface Props {
  album: Album;
  currentAlbumId: string | null;
  currentTrackIndex: number;
  /** The track Ctrl+j/k has highlighted, so the keyboard has something visible to move. */
  selectedIndex: number;
  onClose: () => void;
  onPlay: (trackIndex: number) => void;
}

export function AlbumModal({
  album,
  currentAlbumId,
  currentTrackIndex,
  selectedIndex,
  onClose,
  onPlay,
}: Props) {
  const book = isBook(album);
  const sheet = useRef<HTMLDivElement | null>(null);

  // Keep the Ctrl+j/k highlight on screen as it moves past the fold, the same way the
  // browse grid keeps its own keyboard selection visible.
  useEffect(() => {
    const box = sheet.current;
    const element = box?.querySelector<HTMLElement>(`[data-nav-index="${selectedIndex}"]`);
    if (!box || !element) return;
    const top = element.offsetTop - box.offsetTop;
    const bottom = top + element.offsetHeight;
    const pad = 12;
    if (top - pad < box.scrollTop) box.scrollTop = Math.max(0, top - pad);
    else if (bottom + pad > box.scrollTop + box.clientHeight) {
      box.scrollTop = bottom + pad - box.clientHeight;
    }
  }, [selectedIndex]);

  return (
    <div
      className={ANIMATE_VIEW_TRANSITIONS ? "overlay backdrop-enter" : "overlay"}
      style={{ zIndex: 4, background: "oklch(15% 0.03 210 / .6)" }}
      onClick={onClose}
    >
      <div
        ref={sheet}
        className={ANIMATE_VIEW_TRANSITIONS ? "sheet-enter" : undefined}
        onClick={(event) => event.stopPropagation()}
        style={{
          background: "oklch(96% 0.012 210)",
          borderRadius: 26,
          padding: 26,
          width: 640,
          maxWidth: "100%",
          maxHeight: "100%",
          overflow: "auto",
          boxShadow: "0 24px 60px oklch(10% 0.04 210 / .55)",
        }}
      >
        <div style={{ display: "flex", gap: 20, alignItems: "flex-start" }}>
          <div style={{ width: 150, flex: "none" }}>
            <Cover album={album} size={150} radius={book ? "10px 18px 18px 10px" : "16px"} label />
          </div>
          <div style={{ flex: 1, minWidth: 0 }}>
            <div
              style={{
                fontSize: 26,
                fontWeight: 900,
                color: "oklch(22% 0.03 210)",
                lineHeight: 1.15,
              }}
            >
              {album.title}
            </div>
            <div
              style={{
                fontSize: 15,
                fontWeight: 700,
                color: "oklch(45% 0.03 210 / .85)",
                marginTop: 2,
              }}
            >
              {album.artist}
            </div>
            <div
              style={{
                fontSize: 13,
                fontWeight: 700,
                color: "oklch(50% 0.03 210 / .7)",
                marginTop: 2,
              }}
            >
              {book ? "📖 Hörbuch" : "🎵 Musik"} · {unitLabel(album, album.tracks.length)} ·{" "}
              {clock(album.duration)}
              {album.figure && ` · 🧸 ${album.figure}`}
            </div>
            <button
              onClick={() => onPlay(0)}
              style={{
                marginTop: 14,
                border: "none",
                cursor: "pointer",
                background: "var(--accent)",
                color: "#fff",
                fontSize: 16,
                fontWeight: 800,
                padding: "12px 22px",
                borderRadius: 999,
                display: "flex",
                alignItems: "center",
                gap: 10,
                boxShadow: "0 4px 14px oklch(70% 0.16 340 / .45)",
              }}
            >
              <span
                style={{
                  width: 14,
                  height: 16,
                  background: "#fff",
                  clipPath: "polygon(6% 0%, 100% 50%, 6% 100%)",
                }}
              />
              {book ? "Hörbuch abspielen" : "Alle Songs abspielen"}
            </button>
          </div>
          <button
            onClick={onClose}
            aria-label="Schließen"
            style={{
              border: "none",
              cursor: "pointer",
              background: "oklch(88% 0.02 210)",
              color: "var(--ink)",
              fontSize: 18,
              fontWeight: 900,
              width: 40,
              height: 40,
              borderRadius: 999,
              flex: "none",
            }}
          >
            ×
          </button>
        </div>

        <div style={{ display: "flex", flexDirection: "column", gap: 6, marginTop: 22 }}>
          {album.tracks.map((track, index) => {
            const current = currentAlbumId === album.id && currentTrackIndex === index;
            return (
              <button
                key={index}
                data-nav-index={index}
                onClick={() => onPlay(index)}
                style={{
                  display: "flex",
                  alignItems: "center",
                  gap: 14,
                  padding: "10px 14px",
                  borderRadius: 14,
                  cursor: "pointer",
                  border: "none",
                  font: "inherit",
                  textAlign: "left",
                  background: current
                    ? "oklch(70% 0.16 340 / .16)"
                    : "oklch(30% 0.03 210 / .05)",
                  outline: index === selectedIndex ? "3px solid var(--accent)" : "none",
                  outlineOffset: 2,
                }}
              >
                <div
                  style={{
                    width: 30,
                    height: 30,
                    borderRadius: 999,
                    flex: "none",
                    display: "flex",
                    alignItems: "center",
                    justifyContent: "center",
                    font: "800 13px ui-monospace, Menlo, monospace",
                    background: current ? "var(--accent)" : "oklch(88% 0.02 210)",
                    color: current ? "#fff" : "oklch(35% 0.03 210)",
                  }}
                >
                  {index + 1}
                </div>
                <div
                  style={{
                    flex: 1,
                    minWidth: 0,
                    fontSize: 16,
                    fontWeight: 800,
                    color: current ? "oklch(45% 0.16 340)" : "oklch(24% 0.03 210)",
                  }}
                >
                  {track.title}
                </div>
                <div
                  style={{
                    font: "700 13px ui-monospace, Menlo, monospace",
                    color: "oklch(45% 0.03 210 / .7)",
                  }}
                >
                  {clock(track.duration)}
                </div>
              </button>
            );
          })}
        </div>
      </div>
    </div>
  );
}