import {
  Building2,
  Clock3,
  FileText,
  Filter,
  Layers,
  PackageCheck,
  Phone,
  RotateCw,
  Search,
  User,
  Users,
} from 'lucide-react'
import { useEffect, useState } from 'react'
import { api } from '../../api'
import { StatusBadge } from '../../components/StatusBadge'
import { formatDate, formatDateTime } from '../../utils/date'
import type { Course, CourseStatus } from '../../types'

type StatusFilter = 'ALL' | CourseStatus

export function AdminCourses() {
  const [courses, setCourses] = useState<Course[]>([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState('')
  const [statusFilter, setStatusFilter] = useState<StatusFilter>('ALL')
  const [keyword, setKeyword] = useState('')

  const loadCourses = () => {
    setLoading(true)
    api.admin
      .listCourses({ status: statusFilter, keyword })
      .then((r) => setCourses(r.courses))
      .catch((err) => setError(err.message))
      .finally(() => setLoading(false))
  }

  useEffect(() => {
    loadCourses()
  }, [statusFilter])

  const handleSearch = (e: React.FormEvent) => {
    e.preventDefault()
    loadCourses()
  }

  return (
    <div className="page admin-page">
      <div className="admin-header-row">
        <div>
          <h2>全部课程</h2>
          <p className="admin-subtitle">查看全平台课程及其当前状态</p>
        </div>
        <button className="secondary-button" onClick={loadCourses} title="刷新列表">
          <RotateCw size={15} /> 刷新
        </button>
      </div>

      {error && <div className="notice notice-error">{error}</div>}

      {/* 筛选与搜索工具条 */}
      <div className="admin-filter-bar">
        <div className="filter-tabs">
          <button
            className={`tab-item ${statusFilter === 'ALL' ? 'active' : ''}`}
            onClick={() => setStatusFilter('ALL')}
          >
            全部课程
          </button>
          <button
            className={`tab-item ${statusFilter === 'WAITING_PRODUCTION' ? 'active' : ''}`}
            onClick={() => setStatusFilter('WAITING_PRODUCTION')}
          >
            等待制作
          </button>
          <button
            className={`tab-item ${statusFilter === 'IN_PRODUCTION' ? 'active' : ''}`}
            onClick={() => setStatusFilter('IN_PRODUCTION')}
          >
            正在制作
          </button>
          <button
            className={`tab-item ${statusFilter === 'COMPLETED' ? 'active' : ''}`}
            onClick={() => setStatusFilter('COMPLETED')}
          >
            已完成交付
          </button>
          <button
            className={`tab-item ${statusFilter === 'DRAFT' ? 'active' : ''}`}
            onClick={() => setStatusFilter('DRAFT')}
          >
            草稿中
          </button>
        </div>

        <form className="search-form" onSubmit={handleSearch}>
          <div className="input-with-icon">
            <Search size={16} />
            <input
              value={keyword}
              onChange={(e) => setKeyword(e.target.value)}
              placeholder="搜索课程名、用户手机或姓名…"
            />
          </div>
          <button type="submit" className="secondary-button">
            搜索
          </button>
        </form>
      </div>

      {/* 课程列表 */}
      {loading ? (
        <div className="center-loading">正在查询课程…</div>
      ) : courses.length === 0 ? (
        <div className="empty-state">
          <Filter size={32} style={{ color: '#9aa3b3', marginBottom: 8 }} />
          <h3>没有找到符合条件的课程</h3>
          <p>尝试切换状态筛选条件或清空搜索关键字。</p>
        </div>
      ) : (
        <div className="admin-table-wrapper">
          <table className="admin-table">
            <thead>
              <tr>
                <th>课程名称与大纲</th>
                <th style={{ minWidth: 200 }}>提交制作用户信息</th>
                <th>素材 / 讲师 / 交付</th>
                <th>当前状态</th>
                <th>创建 / 更新时间</th>
                <th>提交 / 交付时间</th>
              </tr>
            </thead>
            <tbody>
              {courses.map((course) => (
                <tr key={course.id}>
                  <td style={{ maxWidth: 260 }}>
                    <div className="table-main-title">
                      <strong className="course-table-name">{course.name}</strong>
                      {course.description && (
                        <small className="course-table-desc" title={course.description}>
                          {course.description}
                        </small>
                      )}
                      <div className="table-episodes-badge">
                        <Layers size={11} /> 共 {course.episodes?.length || 1} 集
                      </div>
                    </div>
                  </td>
                  <td>
                    {/* 醒目的提交用户信息单元格 */}
                    <div className="user-highlight-cell">
                      <div className="user-avatar-mini">
                        {(course.creator?.contactName || course.creator?.phone || '用')[0]}
                      </div>
                      <div className="user-info-stack">
                        <strong className="user-contact-name">
                          {course.creator?.contactName || '未填写联系人'}
                        </strong>
                        <span className="user-org-text" title={course.organizationName || '个人工作区'}>
                          <Building2 size={12} /> {course.organizationName || '个人工作区'}
                        </span>
                        <span className="user-phone-text">
                          <Phone size={12} /> {course.creator?.phone || '无手机号'}
                        </span>
                      </div>
                    </div>
                  </td>
                  <td>
                    <div className="badge-group">
                      <span className="badge-count">
                        <FileText size={12} /> {course.assets?.length || 0} 资产
                      </span>
                      <span className="badge-count">
                        <Users size={12} /> {course.instructors?.length || 0} 讲师
                      </span>
                      {course.deliverables && course.deliverables.length > 0 && (
                        <span className="badge-count deliverable-badge">
                          <PackageCheck size={12} /> {course.deliverables.length} 交付物
                        </span>
                      )}
                    </div>
                  </td>
                  <td>
                    <StatusBadge status={course.status} />
                  </td>
                  <td>
                    <div className="time-cell">
                      <small title={`创建时间：${formatDateTime(course.createdAt)}`}>
                        建: {formatDate(course.createdAt)}
                      </small>
                      <small title={`最后更新时间：${formatDateTime(course.updatedAt || course.createdAt)}`} style={{ color: '#0f172a', fontWeight: 500 }}>
                        更: {formatDateTime(course.updatedAt || course.createdAt)}
                      </small>
                    </div>
                  </td>
                  <td>
                    <div className="time-cell">
                      <small title="提交时间">
                        提: {course.submittedAt ? new Date(course.submittedAt).toLocaleDateString('zh-CN') : '未提交'}
                      </small>
                      {course.completedAt && (
                        <small title="交付时间" style={{ color: '#2e7d32', fontWeight: 500 }}>
                          成: {new Date(course.completedAt).toLocaleDateString('zh-CN')}
                        </small>
                      )}
                    </div>
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      )}
    </div>
  )
}