<template>
  <div class="plan-detail">
    <div v-if="loading" class="loading">
      <el-skeleton animated />
    </div>
    <div v-else-if="error" class="error">
      <el-alert
        :title="'加载计划内容失败 (ID: ' + planId + ')'"
        :description="error"
        type="error"
        show-icon
        @close="error = null"
      />
      <el-button type="primary" @click="fetchPlan" class="retry-btn">重新加载</el-button>
    </div>
    <div v-else-if="plan && plan.id">
      <el-card class="box-card">
        <template #header>
          <div class="card-header">
            <span>{{ plan.name }} - 内容</span>
            <div>
              <template v-if="!isSubPlan">
                <el-button class="button" type="primary" @click="savePlanContent" v-if="isEditingContent">保存</el-button>
                <el-button class="button" @click="cancelEdit" v-if="isEditingContent">取消</el-button>
                <el-button class="button" @click="enterEditMode" v-else>编辑内容</el-button>
              </template>

              <!-- Dynamic Add Buttons -->
              <template v-if="isEditingContent">
                <el-button
                  v-if="plan.content_type === 'sub_plans' || !plan.content_type"
                  type="primary"
                  size="small"
                  @click="showAddSubPlanDialog"
                >增加子计划</el-button>
                <el-button
                  v-if="plan.content_type === 'tasks' || !plan.content_type"
                  type="primary"
                  size="small"
                  @click="showAddTaskDialog"
                >增加子任务</el-button>
              </template>
            </div>
          </div>
        </template>

        <!-- Display Tasks -->
        <div v-if="plan.content_type === 'tasks'">
          <h4>任务列表</h4>
          <el-timeline v-if="plan.tasks.length > 0">
            <el-timeline-item
              v-for="(task, index) in plan.tasks"
              :key="task.id || 'new-task-' + index"
              :timestamp="'执行顺序: ' + (task.execution_order !== undefined ? task.execution_order : index + 1)"
              placement="top"
            >
              <el-card>
                <h5>{{ task.name }} ({{ task.type === 'waiting' ? '延时任务' : '未知任务' }})</h5>
                <p>{{ task.description }}</p>
                <p v-if="task.type === 'waiting' && task.parameters?.delay_duration">
                  延时: {{ task.parameters.delay_duration }} 秒
                </p>
                <el-button-group v-if="isEditingContent">
                  <el-button type="primary" size="small" @click="editTask(task)">编辑</el-button>
                  <el-button type="danger" size="small" @click="deleteTask(task)">删除</el-button>
                </el-button-group>
              </el-card>
            </el-timeline-item>
          </el-timeline>
          <el-empty v-else description="暂无任务"></el-empty>
        </div>

        <!-- Display Sub-plans -->
        <div v-else-if="plan.content_type === 'sub_plans'">
          <h4>子计划列表</h4>
          <div v-if="plan.sub_plans.length > 0">
            <div v-for="(subPlan, index) in plan.sub_plans" :key="subPlan.id || 'new-subplan-' + index" class="sub-plan-wrapper">
              <el-card>
                <div class="sub-plan-card-content">
                  <!-- Pass child_plan_id to recursive PlanDetail -->
                  <plan-detail :plan-id="subPlan.child_plan_id" :is-sub-plan="true" />
                  <el-button-group v-if="isEditingContent" class="sub-plan-actions">
                    <el-button type="danger" size="small" @click="deleteSubPlan(subPlan)">删除</el-button>
                  </el-button-group>
                </div>
              </el-card>
            </div>
          </div>
          <el-empty v-else description="暂无子计划"></el-empty>
        </div>

        <div v-else-if="!plan.content_type">
          <el-empty description="请添加子计划或子任务"></el-empty>
        </div>
      </el-card>
    </div>
    <div v-else>
      <el-empty description="没有计划数据"></el-empty>
    </div>

    <!-- Add Sub-plan Dialog -->
    <el-dialog
      v-model="addSubPlanDialogVisible"
      title="选择子计划"
      width="600px"
      @close="resetAddSubPlanDialog"
    >
      <el-select
        v-model="selectedSubPlanId"
        placeholder="请选择一个计划作为子计划"
        filterable
        style="width: 100%;"
      >
        <el-option
          v-for="item in availablePlans"
          :key="item.id"
          :label="item.name"
          :value="item.id"
        ></el-option>
      </el-select>
      <template #footer>
        <span class="dialog-footer">
          <el-button @click="addSubPlanDialogVisible = false">取消</el-button>
          <el-button type="primary" @click="confirmAddSubPlan">确定</el-button>
        </span>
      </template>
    </el-dialog>

    <!-- Add Task Dialog -->
    <el-dialog
      v-model="addTaskDialogVisible"
      title="增加子任务"
      width="600px"
      @close="resetAddTaskDialog"
    >
      <el-form :model="newTaskForm" ref="newTaskFormRef" :rules="newTaskRules" label-width="100px">
        <el-form-item label="任务类型" prop="type">
          <el-select v-model="newTaskForm.type" placeholder="请选择任务类型" style="width: 100%;">
            <!-- Only Delay Task for now -->
            <el-option label="延时任务" value="delay_task"></el-option>
          </el-select>
        </el-form-item>
        <el-form-item label="任务名称" prop="name">
          <el-input v-model="newTaskForm.name" placeholder="请输入任务名称"></el-input>
        </el-form-item>
        <el-form-item label="任务描述" prop="description">
          <el-input type="textarea" v-model="newTaskForm.description" placeholder="请输入任务描述"></el-input>
        </el-form-item>
        <!-- Dynamic task component for specific parameters -->
        <template v-if="newTaskForm.type === 'delay_task'">
          <DelayTaskEditor
            :parameters="newTaskForm.parameters"
            @update:parameters="val => newTaskForm.parameters = val"
            prop-path="parameters.delay_duration"
            :is-editing="true" 
          />
        </template>
        <!-- More task types can be rendered here -->
      </el-form>
      <template #footer>
        <span class="dialog-footer">
          <el-button @click="addTaskDialogVisible = false">取消</el-button>
          <el-button type="primary" @click="confirmAddTask">确定</el-button>
        </span>
      </template>
    </el-dialog>
  </div>
</template>

<script>
import apiClient from '../api/index.js';
import { ElMessage, ElMessageBox } from 'element-plus';
import { ArrowDown } from '@element-plus/icons-vue'; 
import DelayTaskEditor from './tasks/DelayTask.vue'; 

export default {
  name: 'PlanDetail',
  components: {
    DelayTaskEditor, 
    // Self-reference for recursion
    'plan-detail': this,
    ArrowDown, 
  },
  props: {
    planId: {
      type: [Number, String],
      required: true,
    },
    isSubPlan: {
      type: Boolean,
      default: false,
    },
  },
  data() {
    return {
      plan: {
        id: null,
        name: '',
        description: '',
        execution_type: 'automatic',
        execute_num: 0,
        cron_expression: '',
        content_type: null, 
        sub_plans: [], 
        tasks: [],     
      },
      loading: false,
      error: null,
      isEditingContent: false,
      originalPlanState: null, 

      // Add Sub-plan dialog
      addSubPlanDialogVisible: false,
      selectedSubPlanId: null,
      availablePlans: [],

      // Add Task dialog
      addTaskDialogVisible: false,
      newTaskForm: {
        type: 'delay_task', 
        name: '',
        description: '',
        parameters: { delay_duration: 1 }, // Initialize with delay_duration
      },
      newTaskRules: {
        type: [{ required: true, message: '请选择任务类型', trigger: 'change' }],
        name: [{ required: true, message: '请输入任务名称', trigger: 'blur' }],
        // Add rule for delay_duration directly here, as it's the default type
        'parameters.delay_duration': [{ required: true, message: '请输入延时时间', trigger: 'blur' }],
      },
    };
  },
  computed: {
    delayDurationRules() {
      return [{ required: true, message: '请输入延时时间', trigger: 'blur' }];
    },
  },
  watch: {
    planId: {
      immediate: true,
      handler(newId) {
        if (newId) {
          this.fetchPlan();
        }
      },
    },
    'newTaskForm.type'(newType) {
      // This watch is less critical now since delay_task is the only option
      // but kept for extensibility.
      if (newType === 'delay_task') {
        this.newTaskRules['parameters.delay_duration'] = this.delayDurationRules;
        if (!this.newTaskForm.parameters.delay_duration) {
          this.newTaskForm.parameters.delay_duration = 1;
        }
      } else {
        if (this.newTaskRules['parameters.delay_duration']) {
          delete this.newTaskRules['parameters.delay_duration'];
        }
        if (this.newTaskForm.parameters.delay_duration) {
          delete this.newTaskForm.parameters.delay_duration;
        }
      }
    },
  },
  methods: {
    async fetchPlan() {
      this.loading = true;
      this.error = null;
      try {
        const response = await apiClient.plans.get(this.planId);
        this.plan = {
          ...response.data,
          sub_plans: response.data.sub_plans || [],
          tasks: response.data.tasks || [],
        };
        this.updateContentType(); 
      } catch (err) {
        this.error = err.message || '未知错误';
        console.error(`加载计划 (ID: ${this.planId}) 失败:`, err);
      } finally {
        this.loading = false;
      }
    },
    updateContentType() {
      if (this.plan.sub_plans.length > 0) {
        this.plan.content_type = 'sub_plans';
      } else if (this.plan.tasks.length > 0) {
        this.plan.content_type = 'tasks';
      } else {
        this.plan.content_type = null; 
      }
    },
    enterEditMode() {
      this.isEditingContent = true;
      this.originalPlanState = JSON.parse(JSON.stringify(this.plan));
    },
    async savePlanContent() {
      this.updateContentType(); 
      try {
        const submitData = {
          id: this.plan.id, 
          name: this.plan.name,
          description: this.plan.description,
          execution_type: this.plan.execution_type,
          execute_num: this.plan.execute_num,
          cron_expression: this.plan.cron_expression,
          content_type: this.plan.content_type,
          sub_plan_ids: this.plan.content_type === 'sub_plans'
            ? this.plan.sub_plans.map(sp => sp.child_plan_id) 
            : [],
          tasks: this.plan.content_type === 'tasks'
            ? this.plan.tasks.map((task, index) => ({
                name: task.name,
                description: task.description,
                // Set type to 'waiting' for delay_task
                type: task.type === 'delay_task' ? 'waiting' : task.type,
                execution_order: index + 1, 
                parameters: task.parameters || {},
              }))
            : [],
        };

        delete submitData.execute_count;
        delete submitData.status;

        await apiClient.plans.update(this.planId, submitData);
        ElMessage.success('计划内容已保存');
        this.isEditingContent = false; 
        this.originalPlanState = null; 
        this.fetchPlan(); 
      } catch (error) {
        ElMessage.error('保存计划内容失败: ' + (error.message || '未知错误'));
        console.error('保存计划内容失败:', error);
      }
    },
    cancelEdit() {
      this.plan = JSON.parse(JSON.stringify(this.originalPlanState));
      this.isEditingContent = false; 
      this.originalPlanState = null; 
      ElMessage.info('已取消编辑');
    },

    // --- Sub-plan related methods ---
    async showAddSubPlanDialog() {
      if (this.plan.tasks.length > 0) {
        try {
          await ElMessageBox.confirm('当前计划包含任务，添加子计划将清空现有任务。是否继续？', '警告', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          });
          this.plan.tasks = []; 
        } catch (e) {
          return;
        }
      }
      this.addSubPlanDialogVisible = true;
      await this.fetchAvailablePlans();
    },
    async fetchAvailablePlans() {
      try {
        const response = await apiClient.plans.list();
        this.availablePlans = response.data.plans.filter(p =>
          p.id !== this.planId
        );
      } catch (error) {
        ElMessage.error('加载可用计划失败: ' + (error.message || '未知错误'));
        console.error('加载可用计划失败:', error);
      }
    },
    confirmAddSubPlan() {
      if (!this.selectedSubPlanId) {
        ElMessage.warning('请选择一个子计划');
        return;
      }

      const selectedPlan = this.availablePlans.find(p => p.id === this.selectedSubPlanId);
      if (selectedPlan) {
        this.plan.sub_plans.push({
          id: Date.now(), 
          child_plan_id: selectedPlan.id,
          child_plan: selectedPlan, 
          execution_order: this.plan.sub_plans.length + 1,
        });
        this.updateContentType(); 
        ElMessage.success(`子计划 "${selectedPlan.name}" 已添加`);
        this.addSubPlanDialogVisible = false;
        this.resetAddSubPlanDialog();
      } else {
        ElMessage.error('未找到选中的计划');
      }
    },
    resetAddSubPlanDialog() {
      this.selectedSubPlanId = null;
      this.availablePlans = [];
    },
    deleteSubPlan(subPlanToDelete) {
      ElMessageBox.confirm(`确认删除子计划 "${subPlanToDelete.child_plan?.name || '未知子计划'}" 吗？`, '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        this.plan.sub_plans = this.plan.sub_plans.filter(sub => sub.id !== subPlanToDelete.id);
        this.plan.sub_plans.forEach((item, index) => item.execution_order = index + 1); 
        this.updateContentType(); 
        ElMessage.success('子计划已删除');
      }).catch(() => {
      });
    },

    // --- Task related methods ---
    async showAddTaskDialog() {
      if (this.plan.sub_plans.length > 0) {
        try {
          await ElMessageBox.confirm('当前计划包含子计划，添加任务将清空现有子计划。是否继续？', '警告', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          });
          this.plan.sub_plans = []; 
        } catch (e) {
          return;
        }
      }
      this.addTaskDialogVisible = true;
    },
    confirmAddTask() {
      this.$refs.newTaskFormRef.validate(async (valid) => {
        if (valid) {
          const newTask = {
            id: Date.now(), 
            execution_order: this.plan.tasks.length + 1,
            // Map 'delay_task' UI type to 'waiting' backend type
            type: this.newTaskForm.type === 'delay_task' ? 'waiting' : this.newTaskForm.type,
            name: this.newTaskForm.name,
            description: this.newTaskForm.description,
            parameters: this.newTaskForm.parameters, 
          };

          this.plan.tasks.push(newTask);
          this.updateContentType(); 
          ElMessage.success(`子任务 "${newTask.name}" 已添加`);
          this.addTaskDialogVisible = false;
          this.resetAddTaskDialog();
        }
      });
    },
    resetAddTaskDialog() {
      this.$refs.newTaskFormRef.resetFields();
      this.newTaskForm = {
        type: 'delay_task', 
        name: '',
        description: '',
        parameters: { delay_duration: 1 }, // Reset with default delay_duration
      };
    },
    editTask(task) {
      ElMessage.info('编辑任务功能正在开发中');
      console.log('编辑任务:', task);
    },
    deleteTask(taskToDelete) {
      ElMessageBox.confirm(`确认删除任务 "${taskToDelete.name}" 吗？`, '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        this.plan.tasks = this.plan.tasks.filter(task => task.id !== taskToDelete.id);
        this.plan.tasks.forEach((item, index) => item.execution_order = index + 1); 
        this.updateContentType(); 
        ElMessage.success('任务已删除');
      }).catch(() => {
      });
    },
  },
};
</script>

<style scoped>
.plan-detail {
  margin-top: 10px;
}
.loading, .error {
  padding: 20px;
  text-align: center;
}
.retry-btn {
  margin-top: 15px;
}
.sub-plan-wrapper {
  margin-bottom: 10px; 
}
.sub-plan-container {
  margin-left: 20px;
  margin-top: 10px;
  border-left: 2px solid #ebeef5; 
  padding-left: 10px;
}
.sub-plan-card-content {
  display: flex;
  flex-direction: column; 
  gap: 10px; 
}
.sub-plan-actions {
  align-self: flex-end; 
}
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
/* 调整子计划卡片内部的header，避免重复样式 */
.sub-plan-container .card-header {
  padding: 0; 
}
</style>
