'use client';

import React, { useState } from 'react';
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { Plus, Loader2, AlertCircle, Users, Trash2 } from 'lucide-react';
import { FaYoutube } from 'react-icons/fa';
import { SiTwitch, SiInstagram, SiTiktok, SiX, SiBluesky, SiDiscord } from 'react-icons/si';
import { fetchCollaborators, deleteCollaborator, type Collaborator } from '@/lib/api';
import CollaboratorModal, { PLATFORMS, type PlatformKey } from '@/components/shared/CollaboratorModal';
import styles from './page.module.css';

// ─── Platforms cell ───────────────────────────────────────────────────────────

const PLATFORM_ICON: Record<PlatformKey, React.ReactElement> = {
  youtubeLink:   <FaYoutube size={13} />,
  twitchLink:    <SiTwitch size={13} />,
  instagramLink: <SiInstagram size={13} />,
  tiktokLink:    <SiTiktok size={13} />,
  twitterLink:   <SiX size={13} />,
  blueskyLink:   <SiBluesky size={13} />,
  discordHandle: <SiDiscord size={13} />,
};

function PlatformsCell({ c }: { c: Collaborator }) {
  const links = PLATFORMS.filter((p) => !!c[p.key]);
  if (links.length === 0) return <span className={styles.empty2}>—</span>;
  return (
    <div className={styles.platformBadges}>
      {links.map((p) => {
        const val = c[p.key];
        if (p.urlField && val) {
          return (
            <a key={p.key} href={val} target="_blank" rel="noopener noreferrer" className={styles.platformBadge} title={p.label}>
              {PLATFORM_ICON[p.key]}
            </a>
          );
        }
        return (
          <span key={p.key} className={styles.platformBadge} title={`${p.label}: ${val}`}>
            {PLATFORM_ICON[p.key]}
          </span>
        );
      })}
    </div>
  );
}

// ─── Page ─────────────────────────────────────────────────────────────────────

export default function CollaboratorsPage() {
  const qc = useQueryClient();
  const [modal, setModal] = useState<'create' | Collaborator | null>(null);
  const [confirmDelete, setConfirmDelete] = useState<string | null>(null);
  const [deleteError, setDeleteError] = useState<string | null>(null);

  const deleteMut = useMutation({
    mutationFn: deleteCollaborator,
    onSuccess: () => { qc.invalidateQueries({ queryKey: ['collaborators'] }); setConfirmDelete(null); setDeleteError(null); },
    onError: (e: unknown) => setDeleteError((e as { response?: { data?: { message?: string } } })?.response?.data?.message ?? 'Delete failed'),
  });

  const { data: collaborators = [], isLoading, isError } = useQuery<Collaborator[]>({
    queryKey: ['collaborators'],
    queryFn: fetchCollaborators,
  });

  return (
    <div className={styles.container}>
      <header className={styles.header}>
        <div className={styles.headerLeft}>
          <span className={styles.eyebrow}>People & Partners</span>
          <h1>
            Collaborators
            {collaborators.length > 0 && <span className={styles.count}>{collaborators.length}</span>}
          </h1>
        </div>
        <div className={styles.headerRight}>
          <button className="btn btn-primary" onClick={() => setModal('create')}>
            <Plus size={18} />
            <span>Add Collaborator</span>
          </button>
        </div>
      </header>

      {isLoading && <div className={styles.state}><Loader2 size={24} className={styles.spinner} /><span>Loading collaborators…</span></div>}
      {isError && <div className={styles.state}><AlertCircle size={20} /><span>Failed to load collaborators — is the backend running?</span></div>}
      {!isLoading && !isError && collaborators.length === 0 && (
        <div className={styles.empty}>
          <Users size={40} className={styles.emptyIcon} />
          <p>No collaborators yet.</p>
          <p className={styles.emptyHint}>Add guest creators and partners to use them in your description blocks.</p>
          <button className="btn btn-primary" onClick={() => setModal('create')}>
            <Plus size={18} />
            <span>Add your first collaborator</span>
          </button>
        </div>
      )}

      {!isLoading && !isError && collaborators.length > 0 && (
        <div className={styles.tableContainer}>
          <table className={styles.table}>
            <thead>
              <tr>
                <th>Name</th>
                <th>Platforms</th>
                <th>Aliases</th>
                <th>Status</th>
                <th></th>
              </tr>
            </thead>
            <tbody>
              {collaborators.map((c) => (
                <tr key={c.id}>
                  <td>
                    <div className={styles.nameCell}>
                      <div className={styles.avatar}>{c.name.charAt(0).toUpperCase()}</div>
                      <div>
                        <span className={styles.name}>{c.name}</span>
                        {c.notes && <span className={styles.notes}>{c.notes}</span>}
                      </div>
                    </div>
                  </td>
                  <td>
                    <PlatformsCell c={c} />
                  </td>
                  <td>
                    <div className={styles.aliases}>
                      {c.aliases.slice(0, 2).map((a) => <span key={a} className={styles.alias}>{a}</span>)}
                      {c.aliases.length > 2 && <span className={styles.alias}>+{c.aliases.length - 2}</span>}
                    </div>
                  </td>
                  <td>
                    {c.active ? <span className="pill pill-primary">Active</span> : <span className="pill">Inactive</span>}
                  </td>
                  <td>
                    {confirmDelete === c.id ? (
                      <div className={styles.confirmDelete}>
                        {deleteError
                          ? <span className={styles.deleteErr}>{deleteError}</span>
                          : <span className={styles.confirmText}>Delete?</span>}
                        <button className={styles.confirmYes} onClick={() => deleteMut.mutate(c.id)} disabled={deleteMut.isPending}>
                          {deleteMut.isPending ? <Loader2 size={12} /> : 'Yes'}
                        </button>
                        <button className={styles.confirmNo} onClick={() => { setConfirmDelete(null); setDeleteError(null); }}>
                          {deleteError ? 'OK' : 'No'}
                        </button>
                      </div>
                    ) : (
                      <div style={{ display: 'flex', gap: 'var(--space-3)', alignItems: 'center' }}>
                        <button className={styles.editBtn} onClick={() => setModal(c)}>Edit</button>
                        <button className={styles.trashBtn} onClick={() => { setConfirmDelete(c.id); setDeleteError(null); }}><Trash2 size={14} /></button>
                      </div>
                    )}
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      )}

      {modal !== null && (
        <CollaboratorModal initial={modal === 'create' ? undefined : modal} onClose={() => setModal(null)} />
      )}
    </div>
  );
}