import { useEffect, useState, useCallback } from 'react';
import { teamApi } from '../lib/api';
import type { TeamMember } from '../types';
import { showToast } from '../components/Toast';
import { ConfirmModal } from '../components/ConfirmModal';
import styles from './UsersPage.module.css';

export function TeamMembersPage() {
  const [members, setMembers] = useState<TeamMember[]>([]);
  const [loading, setLoading] = useState(true);

  // Create member modal
  const [createOpen, setCreateOpen] = useState(false);
  const [newUsername, setNewUsername] = useState('');
  const [newPassword, setNewPassword] = useState('');
  const [newDaily, setNewDaily] = useState('50');
  const [newMonthly, setNewMonthly] = useState('500');
  const [createError, setCreateError] = useState('');

  // Confirm toggle
  const [confirmMember, setConfirmMember] = useState<TeamMember | null>(null);

  // Edit quota modal
  const [editMember, setEditMember] = useState<TeamMember | null>(null);
  const [editDaily, setEditDaily] = useState('');
  const [editMonthly, setEditMonthly] = useState('');

  const fetchMembers = useCallback(async () => {
    setLoading(true);
    try {
      const { data } = await teamApi.getMembers();
      setMembers(data.results);
    } catch {
      showToast('加载成员列表失败');
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => { fetchMembers(); }, [fetchMembers]);

  const formatLimit = (v: number) => v === -1 ? '不限' : v + '次';
  const fmtMoney = (val: number) => '¥' + (val || 0).toFixed(2);

  const handleToggleStatus = async (member: TeamMember) => {
    try {
      await teamApi.updateMemberStatus(member.id, !member.is_active);
      showToast(member.is_active ? '已禁用成员' : '已启用成员');
      fetchMembers();
    } catch {
      showToast('操作失败');
    }
  };

  const openEditModal = (member: TeamMember) => {
    setEditMember(member);
    setEditDaily(String(member.daily_generation_limit ?? 50));
    setEditMonthly(String(member.monthly_generation_limit ?? 500));
  };

  const handleSaveQuota = async () => {
    if (!editMember) return;
    try {
      await teamApi.updateMemberQuota(editMember.id, Number(editDaily), Number(editMonthly));
      showToast('配额已更新');
      setEditMember(null);
      fetchMembers();
    } catch {
      showToast('更新失败');
    }
  };

  const resetCreateForm = () => {
    setNewUsername(''); setNewPassword('');
    setNewDaily('50'); setNewMonthly('500');
    setCreateError('');
  };

  const handleCreateMember = async () => {
    setCreateError('');
    if (!newUsername.trim()) { setCreateError('请输入用户名'); return; }
    if (newPassword.length < 6) { setCreateError('密码至少6位'); return; }
    try {
      await teamApi.createMember({
        username: newUsername.trim(),
        password: newPassword,
        daily_generation_limit: Number(newDaily),
        monthly_generation_limit: Number(newMonthly),
      });
      showToast('成员创建成功');
      setCreateOpen(false);
      resetCreateForm();
      fetchMembers();
    } catch (err: any) {
      const msg = err.response?.data?.error || err.response?.data?.username?.[0] || '创建失败';
      setCreateError(msg);
    }
  };

  return (
    <div className={styles.page}>
      <h1 className={styles.title}>成员管理</h1>

      <div className={styles.filters}>
        <div className={styles.searchGroup}>
          <button className={styles.refreshBtn} onClick={fetchMembers}>刷新</button>
        </div>
        <div className={styles.searchGroup}>
          <button className={styles.createBtn} onClick={() => { resetCreateForm(); setCreateOpen(true); }}>+ 新增成员</button>
        </div>
      </div>

      <div className={styles.tableWrapper}>
        <table className={styles.table}>
          <thead>
            <tr>
              <th>用户名</th>
              <th>角色</th>
              <th>状态</th>
              <th>日生成上限</th>
              <th>月生成上限</th>
              <th>今日生成/消费</th>
              <th>本月生成/消费</th>
              <th>操作</th>
            </tr>
          </thead>
          <tbody>
            {loading ? (
              Array.from({ length: 5 }).map((_, i) => (
                <tr key={i}>
                  {Array.from({ length: 8 }).map((_, j) => (
                    <td key={j}><div className={styles.skeletonCell} /></td>
                  ))}
                </tr>
              ))
            ) : members.length === 0 ? (
              <tr><td colSpan={8} className={styles.empty}>暂无成员</td></tr>
            ) : (
              members.map((m) => (
                <tr key={m.id}>
                  <td>{m.username}</td>
                  <td>
                    {m.is_team_admin ? (
                      <span className={styles.statusBadge} style={{ background: 'rgba(108, 99, 255, 0.15)', color: '#6c63ff' }}>管理员</span>
                    ) : (
                      <span style={{ color: 'var(--color-text-secondary)', fontSize: 12 }}>成员</span>
                    )}
                  </td>
                  <td>
                    <span className={`${styles.statusBadge} ${m.is_active ? styles.active : styles.disabled}`}>
                      {m.is_active ? '启用' : '禁用'}
                    </span>
                  </td>
                  <td>{formatLimit(m.daily_generation_limit)}</td>
                  <td>{formatLimit(m.monthly_generation_limit)}</td>
                  <td>{(m.generations_today || 0) + '次 / ' + fmtMoney(m.spent_today)}</td>
                  <td>{(m.generations_this_month || 0) + '次 / ' + fmtMoney(m.spent_this_month)}</td>
                  <td>
                    <div className={styles.actions}>
                      <button className={styles.editBtn} onClick={() => openEditModal(m)}>编辑配额</button>
                      <button
                        className={`${styles.toggleBtn} ${m.is_active ? styles.disableBtn : styles.enableBtn}`}
                        onClick={() => setConfirmMember(m)}
                      >
                        {m.is_active ? '禁用' : '启用'}
                      </button>
                    </div>
                  </td>
                </tr>
              ))
            )}
          </tbody>
        </table>
      </div>

      <ConfirmModal
        open={!!confirmMember}
        title={confirmMember?.is_active ? '禁用成员' : '启用成员'}
        message={confirmMember?.is_active
          ? `确定要禁用成员「${confirmMember?.username}」吗？`
          : `确定要启用成员「${confirmMember?.username}」吗？`}
        confirmText={confirmMember?.is_active ? '禁用' : '启用'}
        danger={confirmMember?.is_active}
        onConfirm={() => { if (confirmMember) { handleToggleStatus(confirmMember); setConfirmMember(null); } }}
        onCancel={() => setConfirmMember(null)}
      />

      {/* Edit Quota Modal */}
      {editMember && (
        <div className={styles.modalOverlay} onMouseDown={(e) => { if (e.target === e.currentTarget) setEditMember(null); }}>
          <div className={styles.modal}>
            <h3 className={styles.modalTitle}>编辑配额 — {editMember.username}</h3>
            <div className={styles.formGroup}>
              <label>每日生成次数上限（-1 为不限）</label>
              <input type="number" value={editDaily} onChange={(e) => setEditDaily(e.target.value)} />
            </div>
            <div className={styles.formGroup}>
              <label>每月生成次数上限（-1 为不限）</label>
              <input type="number" value={editMonthly} onChange={(e) => setEditMonthly(e.target.value)} />
            </div>
            <div className={styles.modalActions}>
              <button className={styles.cancelBtn} onClick={() => setEditMember(null)}>取消</button>
              <button className={styles.saveBtn} onClick={handleSaveQuota}>保存</button>
            </div>
          </div>
        </div>
      )}

      {/* Create Member Modal */}
      {createOpen && (
        <div className={styles.modalOverlay} onMouseDown={(e) => { if (e.target === e.currentTarget) setCreateOpen(false); }}>
          <div className={styles.modal}>
            <h3 className={styles.modalTitle}>新增成员</h3>
            <div className={styles.formGroup}>
              <label>用户名</label>
              <input type="text" value={newUsername} onChange={(e) => setNewUsername(e.target.value)} placeholder="请输入用户名" />
            </div>
            <div className={styles.formGroup}>
              <label>密码</label>
              <input type="password" value={newPassword} onChange={(e) => setNewPassword(e.target.value)} placeholder="至少6位" />
            </div>
            <div className={styles.formRow}>
              <div className={styles.formGroup}>
                <label>每日生成次数上限</label>
                <input type="number" value={newDaily} onChange={(e) => setNewDaily(e.target.value)} />
              </div>
              <div className={styles.formGroup}>
                <label>每月生成次数上限</label>
                <input type="number" value={newMonthly} onChange={(e) => setNewMonthly(e.target.value)} />
              </div>
            </div>
            {createError && <div className={styles.formError}>{createError}</div>}
            <div className={styles.modalActions}>
              <button className={styles.cancelBtn} onClick={() => setCreateOpen(false)}>取消</button>
              <button className={styles.saveBtn} onClick={handleCreateMember}>创建</button>
            </div>
          </div>
        </div>
      )}
    </div>
  );
}