<template>
  <PopupContainer
    v-model="visible"
    title="交易详情"
    height="85%"
    :closeable="false"
  >
    <template #header-actions>
      <van-button size="small" type="primary" plain @click="handleOffsetClick">抵账</van-button>
    </template>

    <van-form style="margin-top: 12px;">
        <van-cell-group inset>
          <van-cell title="交易时间" :value="formatDate(transaction.occurredAt)" />
          <van-cell title="记录时间" :value="formatDate(transaction.createTime)" />
        </van-cell-group>

        <van-cell-group inset title="交易明细">
          <van-field
            v-model="editForm.reason"
            name="reason"
            label="交易摘要"
            placeholder="请输入交易摘要"
            type="textarea"
            rows="2"
            autosize
            maxlength="200"
            show-word-limit
          />
          <van-field
            v-model="editForm.amount"
            name="amount"
            label="交易金额"
            placeholder="请输入交易金额"
            type="number"
            :rules="[{ required: true, message: '请输入交易金额' }]"
          />
          <van-field
            v-model="editForm.balance"
            name="balance"
            label="交易后余额"
            placeholder="请输入交易后余额"
            type="number"
            :rules="[{ required: true, message: '请输入交易后余额' }]"
          />

          <van-field name="type" label="交易类型">
            <template #input>
              <van-radio-group v-model="editForm.type" direction="horizontal">
                <van-radio :name="0">支出</van-radio>
                <van-radio :name="1">收入</van-radio>
                <van-radio :name="2">不计</van-radio>
              </van-radio-group>
            </template>
          </van-field>

          <van-field name="classify" label="交易分类">
            <template #input>
              <span v-if="!editForm.classify" style="color: #c8c9cc;">请选择交易分类</span>
              <span v-else>{{ editForm.classify }}</span>
            </template>
          </van-field>
          
          <!-- 分类选择组件 -->
          <ClassifySelector
            v-model="editForm.classify"
            :type="editForm.type"
            @change="handleClassifyChange"
          />
        </van-cell-group>
    </van-form>

    <template #footer>
      <van-button 
        round 
        block 
        type="primary" 
        :loading="submitting"
        @click="onSubmit"
      >
        保存修改
      </van-button>
    </template>
  </PopupContainer>

  <!-- 抵账候选列表弹窗 -->
  <PopupContainer
    v-model="showOffsetPopup"
    title="选择抵账交易"
    height="70%"
  >
    <van-list>
      <van-cell 
        v-for="item in offsetCandidates" 
        :key="item.id" 
        :title="item.reason" 
        :label="formatDate(item.occurredAt)"
        :value="item.amount"
        is-link
        @click="handleCandidateSelect(item)"
      />
      <van-empty v-if="offsetCandidates.length === 0" description="暂无匹配的抵账交易" />
    </van-list>
  </PopupContainer>
</template>

<script setup>
import { ref, reactive, watch, defineProps, defineEmits } from 'vue'
import { showToast, showConfirmDialog } from 'vant'
import PopupContainer from '@/components/PopupContainer.vue'
import ClassifySelector from '@/components/ClassifySelector.vue'
import { updateTransaction, getCandidatesForOffset, offsetTransactions } from '@/api/transactionRecord'

const props = defineProps({
  show: {
    type: Boolean,
    default: false
  },
  transaction: {
    type: Object,
    default: null
  }
})

const emit = defineEmits(['update:show', 'save'])

const visible = ref(false)
const submitting = ref(false)

// 编辑表单
const editForm = reactive({
  id: 0,
  reason: '',
  amount: '',
  balance: '',
  type: 0,
  classify: ''
})

// 监听props变化
watch(() => props.show, (newVal) => {
  visible.value = newVal
})

watch(() => props.transaction, (newVal) => {
  if (newVal) {
    // 填充编辑表单
    editForm.id = newVal.id
    editForm.reason = newVal.reason || ''
    editForm.amount = String(newVal.amount)
    editForm.balance = String(newVal.balance)
    editForm.type = newVal.type
    editForm.classify = newVal.classify || ''
  }
})

watch(visible, (newVal) => {
  emit('update:show', newVal)
})

// 监听交易类型变化，重新加载分类
watch(() => editForm.type, (newVal) => {
  // 清空已选的分类
  editForm.classify = ''
})

// 提交编辑
const onSubmit = async () => {
  try {
    submitting.value = true
    
    const data = {
      id: editForm.id,
      reason: editForm.reason,
      amount: parseFloat(editForm.amount),
      balance: parseFloat(editForm.balance),
      type: editForm.type,
      classify: editForm.classify
    }
    
    const response = await updateTransaction(data)
    if (response.success) {
      showToast('保存成功')
      visible.value = false
      emit('save', data)
    } else {
      showToast(response.message || '保存失败')
    }
  } catch (error) {
    console.error('保存出错:', error)
    showToast('保存失败')
  } finally {
    submitting.value = false
  }
}

// 分类选择变化
const handleClassifyChange = () => {
  if (editForm.id > 0 && editForm.type >= 0) {
    // 直接保存
    onSubmit()
  }
}

// 清空分类
const formatDate = (dateString) => {
  if (!dateString) return ''
  const date = new Date(dateString)
  return date.toLocaleString('zh-CN', { 
    year: 'numeric', 
    month: '2-digit', 
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit'
  })
}

// 抵账相关
const showOffsetPopup = ref(false)
const offsetCandidates = ref([])

const handleOffsetClick = async () => {
  try {
    const res = await getCandidatesForOffset(editForm.id)
    if (res.success) {
      offsetCandidates.value = res.data || []
      showOffsetPopup.value = true
    } else {
      showToast(res.message || '获取抵账列表失败')
    }
  } catch (error) {
    console.error('获取抵账列表出错:', error)
    showToast('获取抵账列表失败')
  }
}

const handleCandidateSelect = (candidate) => {
  showConfirmDialog({
    title: '确认抵账',
    message: `确认将当前交易与 "${candidate.reason}" (${candidate.amount}) 互相抵消吗？\n抵消后两笔交易将被删除。`,
  })
    .then(async () => {
      try {
        const res = await offsetTransactions(editForm.id, candidate.id)
        if (res.success) {
          showToast('抵账成功')
          showOffsetPopup.value = false
          visible.value = false
          emit('save') // 触发列表刷新
        } else {
          showToast(res.message || '抵账失败')
        }
      } catch (error) {
        console.error('抵账出错:', error)
        showToast('抵账失败')
      }
    })
    .catch(() => {
      // on cancel
    });
}
</script>

<style scoped>
</style>
