"use client";

import { useState } from "react";
import { apiFetch, ApiError, toFormData } from "@/lib/api";
import { useList } from "@/lib/useResource";
import { useToast } from "@/components/toast";
import { DataTable, type Column } from "@/components/DataTable";
import {
  Button,
  ConfirmDialog,
  Field,
  Input,
  Select,
  Modal,
  PageHeader,
} from "@/components/ui";
import { EditIcon, PlusIcon, TrashIcon } from "@/components/icons";
import { formatMinutes, fileNameToTitle } from "@/lib/utils";
import { MediaPreview } from "@/components/MediaPreview";
import { ImagePicker } from "@/components/ImagePicker";
import { pickUrl, SOUND_KEYS, IMAGE_KEYS } from "@/lib/media";

interface Track {
  id: number;
  title?: string;
  artist?: string;
  duration?: number | null;
  type?: string;
  playlist_id?: number;
  image_id?: number | null;
}

interface Playlist {
  id: number;
  name?: string;
}

export default function MusicTracksPage() {
  const { data, loading, error, reload } = useList<Track>("/music");
  const { data: playlists } = useList<Playlist>("/music-playlists");
  const toast = useToast();

  const [editing, setEditing] = useState<Track | null>(null);
  const [open, setOpen] = useState(false);
  const [saving, setSaving] = useState(false);

  const [title, setTitle] = useState("");
  const [artist, setArtist] = useState("");
  const [type, setType] = useState("public");
  const [duration, setDuration] = useState("");
  const [playlistId, setPlaylistId] = useState("");
  const [imageId, setImageId] = useState<number | null>(null);
  const [imageFile, setImageFile] = useState<File | null>(null);
  const [file, setFile] = useState<File | null>(null);

  const [deleting, setDeleting] = useState<Track | null>(null);
  const [removing, setRemoving] = useState(false);

  function resetForm() {
    setTitle("");
    setArtist("");
    setType("public");
    setDuration("");
    setPlaylistId("");
    setImageId(null);
    setImageFile(null);
    setFile(null);
  }

  function openCreate() {
    setEditing(null);
    resetForm();
    setOpen(true);
  }
  function openEdit(row: Track) {
    setEditing(row);
    setTitle(row.title ?? "");
    setArtist(row.artist ?? "");
    setType(row.type ?? "public");
    setDuration(row.duration != null ? String(row.duration) : "");
    setPlaylistId(row.playlist_id != null ? String(row.playlist_id) : "");
    setImageId(row.image_id ?? null);
    setImageFile(null);
    setFile(null);
    setOpen(true);
  }

  async function save(e: React.FormEvent) {
    e.preventDefault();
    setSaving(true);
    try {
      if (editing) {
        // The PUT /music/:id route can carry files, so we POST multipart with
        // Laravel method spoofing (_method=PUT).
        const body = toFormData({
          _method: "PUT",
          title,
          artist,
          type,
          duration,
          image_id: imageId,
          image: imageFile,
          file,
        });
        await apiFetch(`/music/${editing.id}`, { method: "POST", body });
        toast.success("آهنگ ویرایش شد.");
      } else {
        await apiFetch("/music", {
          method: "POST",
          body: toFormData({
            title,
            artist,
            type,
            duration,
            playlist_id: playlistId,
            image_id: imageId,
            image: imageFile,
            file,
          }),
        });
        toast.success("آهنگ افزوده شد.");
      }
      setOpen(false);
      reload();
    } catch (err) {
      toast.error(err instanceof ApiError ? err.message : "خطا در ذخیره‌سازی");
    } finally {
      setSaving(false);
    }
  }

  async function confirmDelete() {
    if (!deleting) return;
    setRemoving(true);
    try {
      await apiFetch(`/music/${deleting.id}`, { method: "DELETE" });
      toast.success("آهنگ حذف شد.");
      setDeleting(null);
      reload();
    } catch (err) {
      toast.error(err instanceof ApiError ? err.message : "خطا در حذف");
    } finally {
      setRemoving(false);
    }
  }

  const columns: Column<Track>[] = [
    {
      key: "play",
      header: "پخش",
      className: "w-20",
      render: (r) => (
        <MediaPreview kind="audio" src={pickUrl(r, SOUND_KEYS)} label={r.title} />
      ),
    },
    {
      key: "thumbnail",
      header: "تصویر",
      className: "w-20",
      render: (r) => (
        <MediaPreview kind="image" src={pickUrl(r, IMAGE_KEYS)} label={r.title} />
      ),
    },
    { key: "title", header: "عنوان" },
    { key: "artist", header: "هنرمند", render: (r) => r.artist ?? "—" },
    {
      key: "duration",
      header: "مدت زمان",
      render: (r) => formatMinutes(r.duration),
    },
    {
      key: "type",
      header: "نوع",
      render: (r) =>
        r.type === "private" ? "خصوصی" : r.type === "public" ? "عمومی" : (r.type ?? "—"),
    },
  ];

  return (
    <div>
      <PageHeader
        title="آهنگ‌ها"
        subtitle="مدیریت آهنگ‌ها و فایل‌های صوتی موسیقی"
        action={
          <Button icon={<PlusIcon className="h-4 w-4" />} onClick={openCreate}>
            آهنگ جدید
          </Button>
        }
      />

      <DataTable
        columns={columns}
        rows={data}
        loading={loading}
        error={error}
        onRetry={reload}
        emptyMessage="هنوز آهنگی بارگذاری نشده است."
        emptyAction={
          <Button icon={<PlusIcon className="h-4 w-4" />} onClick={openCreate}>
            آهنگ جدید
          </Button>
        }
        actions={(row) => (
          <>
            <Button variant="ghost" onClick={() => openEdit(row)} aria-label="ویرایش">
              <EditIcon className="h-4 w-4" />
            </Button>
            <Button
              variant="ghost"
              onClick={() => setDeleting(row)}
              aria-label="حذف"
              className="text-danger"
            >
              <TrashIcon className="h-4 w-4" />
            </Button>
          </>
        )}
      />

      <Modal
        open={open}
        onClose={() => setOpen(false)}
        title={editing ? "ویرایش آهنگ" : "آهنگ جدید"}
        footer={
          <>
            <Button variant="secondary" onClick={() => setOpen(false)}>
              انصراف
            </Button>
            <Button form="track-form" type="submit" loading={saving}>
              ذخیره
            </Button>
          </>
        }
      >
        <form id="track-form" onSubmit={save} className="flex flex-col gap-4">
          <Field label="عنوان" required>
            <Input
              value={title}
              onChange={(e) => setTitle(e.target.value)}
              placeholder="مثلاً آرامش شبانه"
              required
              autoFocus
            />
          </Field>

          <Field label="هنرمند">
            <Input
              value={artist}
              onChange={(e) => setArtist(e.target.value)}
              placeholder="نام هنرمند"
            />
          </Field>

          <Field label="تصویر جلد" hint="انتخاب از کتابخانه یا بارگذاری تصویر جدید">
            <ImagePicker
              imageId={imageId}
              onPickId={setImageId}
              file={imageFile}
              onPickFile={setImageFile}
              existingUrl={editing ? pickUrl(editing, IMAGE_KEYS) : null}
            />
          </Field>

          <Field label="نوع">
            <Select value={type} onChange={(e) => setType(e.target.value)}>
              <option value="public">عمومی</option>
              <option value="private">خصوصی</option>
            </Select>
          </Field>

          <Field label="مدت زمان (دقیقه)">
            <Input
              type="number"
              value={duration}
              onChange={(e) => setDuration(e.target.value)}
              dir="ltr"
            />
          </Field>

          {!editing && (
            <Field label="پلی‌لیست">
              <Select
                value={playlistId}
                onChange={(e) => setPlaylistId(e.target.value)}
              >
                <option value="">انتخاب کنید…</option>
                {playlists.map((p) => (
                  <option key={p.id} value={p.id}>
                    {p.name ?? `#${p.id}`}
                  </option>
                ))}
              </Select>
            </Field>
          )}

          <Field
            label={editing ? "فایل صوتی (در صورت تغییر)" : "فایل صوتی"}
            hint={editing ? "در صورت خالی بودن، فایل قبلی حفظ می‌شود." : undefined}
            required={!editing}
          >
            <Input
              type="file"
              accept="audio/*"
              onChange={(e) => {
                const f = e.target.files?.[0] ?? null;
                setFile(f);
                // Fill the title from the file name if still empty.
                if (f && !title.trim()) setTitle(fileNameToTitle(f.name));
              }}
              required={!editing}
            />
          </Field>
        </form>
      </Modal>

      <ConfirmDialog
        open={!!deleting}
        message={`آیا از حذف «${deleting?.title ?? ""}» مطمئن هستید؟`}
        loading={removing}
        onConfirm={confirmDelete}
        onClose={() => setDeleting(null)}
      />
    </div>
  );
}