<template>
  <a-modal
    v-model:open="visible"
    title="预约上课"
    :confirm-loading="loading"
    @ok="handleSubmit"
    @cancel="handleCancel"
    width="700px"
    destroy-on-close
  >
    <a-steps :current="currentStep" size="small" class="steps-navigator">
      <a-step title="选择套餐" />
      <a-step title="选择课程包" />
      <a-step title="选择课程类型" />
      <a-step title="选择班级" />
      <a-step title="设置时间" />
    </a-steps>

    <div class="step-content">
      <!-- 步骤1: 选择套餐（租户可拥有多个套餐，一对多） -->
      <div v-show="currentStep === 0" class="step-panel">
        <h3>选择套餐</h3>
        <a-alert
          message="请先选择要预约的套餐，再选择套餐下的课程包"
          type="info"
          show-icon
          style="margin-bottom: 16px"
        />
        <a-spin :spinning="loadingPackages">
          <div v-if="collections.length > 0" class="packages-section">
            <div class="packages-grid collections-grid">
              <div
                v-for="coll in collections"
                :key="coll.id"
                :class="['package-card collection-card', { active: formData.collectionId === coll.id }]"
                @click="selectCollection(coll)"
              >
                <div class="package-name">{{ coll.name }}</div>
                <div class="package-grade">{{ Array.isArray(coll.gradeLevels) ? coll.gradeLevels.join(', ') : (coll.gradeLevels || '-') }}</div>
                <div class="package-count">{{ coll.packageCount ?? 0 }} 个课程包</div>
              </div>
            </div>
          </div>
          <div v-else-if="!loadingPackages" class="packages-section">
            <a-alert message="暂无课程套餐，请联系管理员" type="info" show-icon />
          </div>
        </a-spin>
      </div>

      <!-- 步骤2: 选择课程包 -->
      <div v-show="currentStep === 1" class="step-panel">
        <h3>选择课程包</h3>
        <a-spin :spinning="loadingPackages">
        <div v-if="selectedCollection && selectedCollection.packages && selectedCollection.packages.length > 0" class="packages-section">
          <div class="packages-grid">
            <div
              v-for="pkg in selectedCollection.packages"
              :key="pkg.id"
              :class="['package-card', { active: formData.packageId === pkg.id }]"
              @click="selectPackage(pkg.id)"
            >
              <div class="package-name">{{ pkg.name }}</div>
              <div class="package-grade">{{ Array.isArray(pkg.gradeLevels) ? pkg.gradeLevels.join(', ') : pkg.gradeLevels }}</div>
              <div class="package-count">{{ pkg.courseCount }} 门课程</div>
            </div>
          </div>
        </div>
        <div v-else-if="!loadingPackages && selectedCollection && (!selectedCollection.packages || selectedCollection.packages.length === 0)" class="packages-section">
          <a-alert message="该套餐暂无课程包" type="warning" show-icon />
        </div>
        <div v-else-if="!loadingPackages && !selectedCollection" class="packages-section">
          <a-alert message="请先选择套餐" type="info" show-icon />
        </div>
        </a-spin>

        <!-- 排课计划参考（与学校端一致） -->
        <div v-if="scheduleRefDisplay.length > 0" class="schedule-ref-card">
          <div class="ref-header">
            <CalendarOutlined class="ref-icon" />
            <span class="ref-title">排课计划参考</span>
          </div>
          <a-table
            :columns="scheduleRefColumns"
            :data-source="scheduleRefDisplay"
            :pagination="false"
            size="small"
            bordered
          >
            <template #bodyCell="{ column, record }">
              <template v-if="column.key === 'dayOfWeek'">
                {{ formatDayOfWeek(record.dayOfWeek) }}
              </template>
              <template v-else-if="column.key === 'lessonType'">
                <a-tag v-if="record.lessonType" size="small" :style="getLessonTagStyle(record.lessonType)">
                  {{ getLessonTypeName(record.lessonType) }}
                </a-tag>
                <span v-else>-</span>
              </template>
            </template>
          </a-table>
        </div>
      </div>

      <!-- 步骤3: 选择课程类型 -->
      <div v-show="currentStep === 2" class="step-panel">
        <h3>选择课程类型</h3>
        <a-alert
          message="请选择一个课程类型进行排课"
          type="info"
          show-icon
          style="margin-bottom: 16px"
        />
        <a-spin :spinning="loadingLessonTypes">
          <div v-if="!loadingLessonTypes && lessonTypes.length === 0" class="lesson-type-empty">
            该课程包暂无课程类型，请先选择其他课程包
          </div>
          <div v-else class="lesson-type-grid">
            <div
              v-for="type in lessonTypes"
              :key="type.lessonType"
              :class="['lesson-type-card', { active: formData.lessonType === type.lessonType }]"
              :style="getLessonTagStyle(type.lessonType)"
              @click="selectLessonType(type.lessonType)"
            >
              <div class="type-icon">
                <component :is="getLessonTypeIconComponent(type.lessonType)" />
              </div>
              <div class="type-name">{{ getLessonTypeName(type.lessonType) }}</div>
              <div class="type-count">{{ type.count }} 节课</div>
            </div>
          </div>
        </a-spin>
      </div>

      <!-- 步骤4: 选择班级（教师端单选） -->
      <div v-show="currentStep === 3" class="step-panel">
        <h3>选择班级</h3>
        <a-alert
          message="请选择要排课的班级"
          type="info"
          show-icon
          style="margin-bottom: 16px"
        />
        <div class="class-select-grid">
          <div
            v-for="cls in myClasses"
            :key="cls.id"
            :class="['class-card', { active: formData.classId === cls.id }]"
            @click="formData.classId = cls.id"
          >
            <div class="class-name">{{ cls.name }}</div>
            <div class="class-detail">{{ cls.studentCount }} 名学生</div>
          </div>
        </div>
        <div v-if="myClasses.length === 0" class="empty-hint">暂无可用班级</div>
      </div>

      <!-- 步骤5: 设置时间 -->
      <div v-show="currentStep === 4" class="step-panel">
        <h3>设置时间</h3>
        <a-form layout="vertical">
          <a-form-item label="排课日期" required>
            <a-date-picker
              v-model:value="formData.scheduledDate"
              style="width: 100%"
              placeholder="选择日期"
              :disabled-date="(current) => current && current < dayjs().startOf('day')"
            />
          </a-form-item>

          <a-form-item label="时间段" required>
            <a-time-range-picker
              v-model:value="formData.scheduledTimeRange"
              format="HH:mm"
              style="width: 100%"
              :placeholder="['开始时间', '结束时间']"
            />
          </a-form-item>
        </a-form>

        <div class="confirm-info">
          <a-alert type="info" show-icon>
            <template #message>
              <div>将为班级 <strong>{{ selectedClassName }}</strong> 创建排课</div>
            </template>
            <template #description>
              <div>课程类型: {{ getSelectedLessonTypeName() }}</div>
              <div>排课日期: {{ formData.scheduledDate?.format('YYYY-MM-DD') || '-' }}</div>
              <div>时间段: {{ getSelectedTimeRange() || '-' }}</div>
            </template>
          </a-alert>
        </div>
      </div>
    </div>

    <template #footer>
      <div class="modal-footer">
        <a-button v-if="currentStep > 0" @click="prevStep">上一步</a-button>
        <a-button v-if="currentStep < 4" type="primary" @click="nextStep">下一步</a-button>
        <a-button v-else type="primary" :loading="loading" @click="handleSubmit">创建排课</a-button>
        <a-button @click="handleCancel">取消</a-button>
      </div>
    </template>
  </a-modal>
</template>

<script setup lang="ts">
import { ref, reactive, computed } from 'vue';
import { message } from 'ant-design-vue';
import dayjs, { Dayjs } from 'dayjs';
import {
  BookOutlined,
  CalendarOutlined,
  TeamOutlined,
  HeartOutlined,
  SoundOutlined,
  UsergroupAddOutlined,
  ExperimentOutlined,
  BgColorsOutlined,
} from '@ant-design/icons-vue';
import {
  getCourseCollections,
  getCourseCollectionPackages,
  getCoursePackageLessonTypes,
  type CourseCollection,
  type CoursePackageItem,
  type LessonTypeInfo,
} from '@/api/school';
import { getTeacherClasses, createTeacherSchedule, type TeacherClass } from '@/api/teacher';
import { getLessonTypeName, getLessonTagStyle } from '@/utils/tagMaps';

const emit = defineEmits<{
  (e: 'success'): void;
}>();

const visible = ref(false);
const loading = ref(false);
const loadingLessonTypes = ref(false);
const currentStep = ref(0);
/** 从课程详情进入时，跳过套餐与课程包选择 */
const isPresetMode = ref(false);

const collections = ref<CourseCollection[]>([]);
const loadingPackages = ref(false);
const lessonTypes = ref<LessonTypeInfo[]>([]);
const myClasses = ref<TeacherClass[]>([]);

// 排课计划参考数据
const scheduleRefData = ref<any[]>([]);

// 排课计划参考表格列（与学校端一致）
const scheduleRefColumns = [
  { title: '时间', dataIndex: 'dayOfWeek', key: 'dayOfWeek', width: 80 },
  { title: '课程类型', dataIndex: 'lessonType', key: 'lessonType', width: 100 },
  { title: '课程名称', dataIndex: 'lessonName', key: 'lessonName' },
  { title: '区域活动', dataIndex: 'activity', key: 'activity' },
  { title: '备注', dataIndex: 'note', key: 'note' },
];

const weekDayNames: Record<number, string> = {
  1: '周一',
  2: '周二',
  3: '周三',
  4: '周四',
  5: '周五',
  6: '周六',
  0: '周日',
};

const formatDayOfWeek = (val: number | string | undefined): string => {
  if (val === undefined || val === null) return '-';
  if (typeof val === 'string') {
    if (/^[一二三四五六日]/.test(val) || val.startsWith('周')) return val;
    const n = parseInt(val, 10);
    if (!isNaN(n)) return weekDayNames[n] ?? weekDayNames[n as 0] ?? '-';
  }
  if (typeof val === 'number') return weekDayNames[val as 0] ?? '-';
  return '-';
};

const normalizeScheduleRefData = (raw: any[]): any[] => {
  if (!Array.isArray(raw) || raw.length === 0) return [];
  const first = raw[0];
  const isWeeklyFormat = 'dayOfWeek' in first || 'lessonName' in first || 'activity' in first;
  const isLessonMetaFormat = 'title' in first && ('suggestedOrder' in first || 'description' in first);
  if (isWeeklyFormat && !isLessonMetaFormat) {
    return raw.map((r, i) => ({
      key: r.key ?? `row_${i}`,
      dayOfWeek: r.dayOfWeek,
      lessonType: r.lessonType,
      lessonName: r.lessonName ?? r.title ?? '-',
      activity: r.activity ?? r.description ?? '-',
      note: r.note ?? r.tips ?? r.frequency ?? '-',
    }));
  }
  return raw.map((r, i) => ({
    key: r.key ?? `row_${i}`,
    dayOfWeek: r.dayOfWeek ?? '-',
    lessonType: r.lessonType,
    lessonName: r.title ?? r.lessonName ?? '-',
    activity: r.description ?? r.activity ?? (Array.isArray(r.keyPoints) ? r.keyPoints.join('；') : '-'),
    note: r.tips ?? r.frequency ?? r.note ?? '-',
  }));
};

const scheduleRefDisplay = computed(() => normalizeScheduleRefData(scheduleRefData.value));

interface FormData {
  collectionId?: number;
  packageId?: number;
  courseId?: number;
  lessonType?: string;
  classId?: number;
  scheduledDate?: Dayjs;
  scheduledTimeRange?: [Dayjs, Dayjs];
}

const formData = reactive<FormData>({});

const selectedCollection = computed(() => {
  if (!formData.collectionId) return null;
  return collections.value.find(c => c.id === formData.collectionId) || null;
});

const selectedClassName = computed(() => {
  if (!formData.classId) return '-';
  const cls = myClasses.value.find(c => c.id === formData.classId);
  return cls?.name || '-';
});

/** 从课程中心打开时的预设（跳过步骤1、2） */
export interface SchedulePreset {
  packageId: number;
  courseId: number;
  lessonType: string;
  classId?: number;
  /** 可选，若已知所属套餐可传入以节省请求 */
  collectionId?: number;
}

const open = () => {
  isPresetMode.value = false;
  visible.value = true;
  currentStep.value = 0;
  resetForm();
  loadCollections();
  loadMyClasses();
};

/** 从课程详情打开：跳过套餐与课程包，从选择课程类型开始 */
const openWithPreset = async (preset: SchedulePreset) => {
  isPresetMode.value = true;
  visible.value = true;
  resetForm();
  formData.packageId = preset.packageId;
  formData.courseId = preset.courseId;
  formData.lessonType = preset.lessonType;
  formData.classId = preset.classId;

  await loadMyClasses();
  try {
    await loadLessonTypes(preset.packageId);
  } catch {
    // 校本课程等场景可能无对应课程包接口，使用预设类型填充
    lessonTypes.value = preset.lessonType
      ? [{ lessonType: preset.lessonType, count: 1 }]
      : [];
  }

  // 从选择课程类型（步骤2）开始，跳过套餐与课程包
  currentStep.value = 2;
};

const resetForm = () => {
  formData.collectionId = undefined;
  formData.packageId = undefined;
  formData.courseId = undefined;
  formData.lessonType = undefined;
  formData.classId = undefined;
  formData.scheduledDate = undefined;
  formData.scheduledTimeRange = undefined;
  scheduleRefData.value = [];
  lessonTypes.value = [];
};

// 加载课程套餐列表（租户可拥有多个套餐）
const loadCollections = async () => {
  loadingPackages.value = true;
  try {
    collections.value = await getCourseCollections();
    // 若仅有一个套餐，自动选中并加载其课程包，提升体验
    if (collections.value.length === 1) {
      await selectCollection(collections.value[0]);
    }
  } catch (error) {
    console.error('加载课程套餐失败:', error);
    message.error('加载课程套餐失败');
  } finally {
    loadingPackages.value = false;
  }
};

// 选择套餐，并加载该套餐下的课程包
const selectCollection = async (coll: CourseCollection) => {
  formData.collectionId = coll.id as number;
  formData.packageId = undefined;
  formData.courseId = undefined;
  scheduleRefData.value = [];
  lessonTypes.value = [];

  if (!coll.id) return;
  loadingPackages.value = true;
  try {
    const packages = await getCourseCollectionPackages(coll.id);
    (coll as any).packages = packages || [];
    if (!packages || packages.length === 0) {
      message.warning('该套餐暂无课程包');
    }
  } catch (error) {
    console.error('加载套餐课程包失败:', error);
    message.error('加载课程包失败');
  } finally {
    loadingPackages.value = false;
  }
};

const loadMyClasses = async () => {
  try {
    myClasses.value = await getTeacherClasses();
  } catch (error) {
    message.error('加载班级失败');
  }
};

const selectPackage = async (packageId: number) => {
  formData.packageId = packageId;

  const collection = selectedCollection.value;
  if (collection?.packages) {
    const pkg = collection.packages.find((p: any) => p.id === packageId);
    if (pkg?.courses && pkg.courses.length > 0) {
      formData.courseId = pkg.courses[0].id;

      // 加载排课计划参考（从课程包中任一课程的 scheduleRefData 获取）
      const courseWithRef = pkg.courses.find((c: any) => c.scheduleRefData);
      const rawRef = courseWithRef?.scheduleRefData ?? (pkg as any).scheduleRefData;
      if (rawRef) {
        try {
          const parsed = typeof rawRef === 'string' ? JSON.parse(rawRef) : rawRef;
          scheduleRefData.value = Array.isArray(parsed) ? parsed : [];
        } catch (e) {
          console.error('解析排课计划参考失败:', e);
          scheduleRefData.value = [];
        }
      } else {
        scheduleRefData.value = [];
      }
    } else {
      formData.courseId = undefined;
      scheduleRefData.value = [];
    }
  }

  await loadLessonTypes(packageId);
};

const loadLessonTypes = async (packageId: number) => {
  loadingLessonTypes.value = true;
  try {
    lessonTypes.value = await getCoursePackageLessonTypes(packageId);
  } catch (error) {
    message.error('加载课程类型失败');
  } finally {
    loadingLessonTypes.value = false;
  }
};

const selectLessonType = (lessonType: string) => {
  formData.lessonType = lessonType;
};

const lessonTypeIconMap: Record<string, any> = {
  INTRODUCTION: BookOutlined,
  INTRO: BookOutlined,
  COLLECTIVE: TeamOutlined,
  LANGUAGE: SoundOutlined,
  DOMAIN_LANGUAGE: SoundOutlined,
  SOCIETY: UsergroupAddOutlined,
  SOCIAL: UsergroupAddOutlined,
  DOMAIN_SOCIAL: UsergroupAddOutlined,
  SCIENCE: ExperimentOutlined,
  DOMAIN_SCIENCE: ExperimentOutlined,
  ART: BgColorsOutlined,
  DOMAIN_ART: BgColorsOutlined,
  HEALTH: HeartOutlined,
  DOMAIN_HEALTH: HeartOutlined,
  MUSIC: SoundOutlined,
  SPORT: HeartOutlined,
  OUTDOOR: TeamOutlined,
};
const getLessonTypeIconComponent = (type: string) => lessonTypeIconMap[type] || BookOutlined;

const getSelectedLessonTypeName = (): string => {
  if (!formData.lessonType) return '-';
  return getLessonTypeName(formData.lessonType);
};

const getSelectedTimeRange = (): string => {
  if (!formData.scheduledTimeRange) return '';
  return `${formData.scheduledTimeRange[0].format('HH:mm')}-${formData.scheduledTimeRange[1].format('HH:mm')}`;
};

const validateStep = (): boolean => {
  switch (currentStep.value) {
    case 0:
      if (!formData.collectionId) {
        message.warning('请选择套餐');
        return false;
      }
      break;
    case 1:
      if (!formData.collectionId) {
        message.warning('请选择套餐');
        return false;
      }
      if (!formData.packageId) {
        message.warning('请选择课程包');
        return false;
      }
      if (!formData.courseId) {
        message.warning('课程包数据异常，请联系管理员');
        return false;
      }
      break;
    case 2:
      if (!formData.lessonType) {
        message.warning('请选择课程类型');
        return false;
      }
      break;
    case 3:
      if (!formData.classId) {
        message.warning('请选择班级');
        return false;
      }
      break;
    case 4:
      if (!formData.scheduledDate) {
        message.warning('请选择排课日期');
        return false;
      }
      if (!formData.scheduledTimeRange) {
        message.warning('请选择时间段');
        return false;
      }
      break;
  }
  return true;
};

const nextStep = () => {
  if (validateStep()) currentStep.value++;
};

const prevStep = () => {
  // 预设模式下从步骤2点击上一步时关闭弹窗（不展示套餐/课程包选择）
  if (isPresetMode.value && currentStep.value === 2) {
    handleCancel();
    return;
  }
  currentStep.value--;
};

const handleSubmit = async () => {
  if (!validateStep()) return;

  loading.value = true;
  try {
    let scheduledTime: string | undefined;
    if (formData.scheduledTimeRange && formData.scheduledTimeRange.length === 2) {
      scheduledTime = `${formData.scheduledTimeRange[0].format('HH:mm')}-${formData.scheduledTimeRange[1].format('HH:mm')}`;
    }

    const dateStr = formData.scheduledDate!.format('YYYY-MM-DD');
    const lessonTypeName = getSelectedLessonTypeName();
    const name = `${lessonTypeName} - ${dateStr}`;

    await createTeacherSchedule({
      name,
      classId: formData.classId!,
      courseId: formData.courseId!,
      coursePackageId: formData.packageId,
      lessonType: formData.lessonType,
      scheduledDate: dateStr,
      scheduledTime,
      repeatType: 'NONE',
      note: undefined,
    });

    message.success('预约成功');
    visible.value = false;
    emit('success');
  } catch (error) {
    message.error('预约失败');
  } finally {
    loading.value = false;
  }
};

const handleCancel = () => {
  visible.value = false;
};

defineExpose({ open, openWithPreset });
</script>

<style scoped lang="scss">
.steps-navigator {
  margin-bottom: 32px;
  padding: 0 20px;
}

.step-content {
  min-height: 400px;
  padding: 0 20px;
}

.step-panel {
  h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: #2D3436;
  }

  h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 12px;
    margin-top: 20px;
    color: #333;
  }
}

.collection-option {
  .collection-name { font-weight: 500; }
  .collection-info { font-size: 12px; color: #999; }
}

.packages-section { margin-top: 24px; }

.collections-grid {
  .collection-card {
    .package-count { color: #722ed1; }
  }
}

.packages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

.package-card {
  padding: 12px;
  background: white;
  border: 2px solid #E0E0E0;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;

  &:hover { border-color: #BDBDBD; }
  &.active {
    border-color: #722ed1;
    background: #f9f0ff;
  }

  .package-name { font-weight: 500; color: #2D3436; margin-bottom: 4px; }
  .package-grade { font-size: 12px; color: #999; margin-bottom: 2px; }
  .package-count { font-size: 11px; color: #722ed1; }
}

.schedule-ref-card {
  margin-top: 24px;
  padding: 16px;
  background: #f9f0ff;
  border-radius: 8px;

  .ref-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;

    .ref-icon {
      color: #722ed1;
    }

    .ref-title {
      font-weight: 600;
      color: #2D3436;
    }
  }
}

.lesson-type-empty {
  padding: 40px;
  text-align: center;
  color: #999;
}

.lesson-type-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
}

.lesson-type-card {
  padding: 20px;
  border: 2px solid transparent;
  border-radius: 12px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
  user-select: none;

  &:hover {
    border-color: rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  }

  &.active {
    border-color: #43e97b !important;
    box-shadow: 0 0 0 3px rgba(67, 233, 123, 0.4) !important;
    transform: scale(1.02);
  }

  .type-icon { font-size: 32px; margin-bottom: 8px; opacity: 0.9; }
  .type-name { font-weight: 500; margin-bottom: 4px; }
  .type-count { font-size: 12px; opacity: 0.85; }
}

.class-select-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.class-card {
  padding: 16px;
  background: white;
  border: 2px solid #E0E0E0;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;

  &:hover { border-color: #BDBDBD; }
  &.active {
    border-color: #722ed1;
    background: #f9f0ff;
  }

  .class-name { font-weight: 500; color: #2D3436; margin-bottom: 4px; }
  .class-detail { font-size: 12px; color: #999; }
}

.empty-hint {
  padding: 40px;
  text-align: center;
  color: #999;
}

.confirm-info {
  margin-top: 24px;
  padding: 16px;
  background: #F5F5F5;
  border-radius: 8px;

  div { margin-bottom: 4px; }
  div:last-child { margin-bottom: 0; }
  strong { color: #722ed1; }
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}
</style>
