import { useState } from 'react';
import { Alert, Form, Input, InputNumber, Modal, Select, Space, Tabs, message } from 'antd';
import { ProCard } from '@ant-design/pro-components';
import { useQuery, useQueryClient } from '@tanstack/react-query';
import type { ColDef } from '@ag-grid-community/core';
import dayjs from 'dayjs';
import PageContainer from '@/components/common/PageContainer';
import SearchForm from '@/components/common/SearchForm';
import DataGrid from '@/components/common/DataGrid';
import PermissionButton from '@/components/common/PermissionButton';
import {
  commissionApi,
  ReferralRuleRow,
  ReferralLedgerRow,
  CommissionSearchParam,
} from '@/api/commission';
import { GRAY, RADIUS, SHADOW } from '@/theme/tokens';

const fmt = (v: unknown) => (v as number)?.toLocaleString() ?? '-';

const RULE_COLS: ColDef<ReferralRuleRow>[] = [
  { field: 'referralType',    headerName: '유형',     width: 120 },
  { field: 'calcType',        headerName: '계산방식', width: 110 },
  { field: 'commissionRate',  headerName: '수수료율', width: 110, type: 'numericColumn' },
  { field: 'fixedAmount',     headerName: '정액',     flex: 1, type: 'numericColumn', valueFormatter: (p) => fmt(p.value) },
  { field: 'effectiveFrom',   headerName: '적용시작', width: 120 },
  { field: 'effectiveTo',     headerName: '적용종료', width: 120 },
];

const LEDGER_COLS: ColDef<ReferralLedgerRow>[] = [
  { field: 'settleMonth',      headerName: '정산월',     width: 110, pinned: 'left' },
  { field: 'referrerAgentName',headerName: '소개설계사', width: 130 },
  { field: 'contractNo',       headerName: '계약번호',   width: 140 },
  { field: 'referralType',     headerName: '유형',       width: 100 },
  { field: 'baseAmount',       headerName: '기준금액',   flex: 1, type: 'numericColumn', valueFormatter: (p) => fmt(p.value) },
  { field: 'commissionRate',   headerName: '수수료율',   width: 110, type: 'numericColumn' },
  { field: 'commissionAmount', headerName: '수수료',     flex: 1, type: 'numericColumn', valueFormatter: (p) => fmt(p.value) },
  { field: 'status',           headerName: '상태',       width: 100 },
];

export default function ReferralCommission() {
  const qc = useQueryClient();
  const [ledgerParams, setLedgerParams] = useState<CommissionSearchParam>({
    settleMonth: dayjs().format('YYYYMM'), pageSize: 200,
  });
  const [ruleModalOpen, setRuleModalOpen] = useState(false);
  const [editingRule, setEditingRule] = useState<ReferralRuleRow | null>(null);
  const [form] = Form.useForm();

  const { data: rulesData, isLoading: rulesLoading, isError: rulesError } = useQuery({
    queryKey: ['referral', 'rules'],
    queryFn: () => commissionApi.referralRules(),
    retry: false,
  });

  const { data: ledgersData, isLoading: ledgersLoading } = useQuery({
    queryKey: ['referral', 'ledgers', ledgerParams],
    queryFn: () => commissionApi.referralLedgers(ledgerParams),
    retry: false,
  });

  const rules = rulesData?.list ?? [];
  const ledgers = ledgersData?.list ?? [];

  const openCreate = () => { setEditingRule(null); form.resetFields(); setRuleModalOpen(true); };
  const openEdit = (row: ReferralRuleRow) => { setEditingRule(row); form.setFieldsValue(row); setRuleModalOpen(true); };

  const handleSave = async () => {
    const values = await form.validateFields();
    try {
      if (editingRule) {
        await commissionApi.referralRuleUpdate(editingRule.ruleId, values);
        message.success('수정 완료');
      } else {
        await commissionApi.referralRuleCreate(values);
        message.success('등록 완료');
      }
      qc.invalidateQueries({ queryKey: ['referral', 'rules'] });
      setRuleModalOpen(false);
    } catch { /* request.ts 처리 */ }
  };

  const handleDelete = (id: number) => Modal.confirm({
    title: '룰 삭제', content: '삭제하시겠습니까?',
    onOk: async () => {
      await commissionApi.referralRuleDelete(id);
      message.success('삭제 완료');
      qc.invalidateQueries({ queryKey: ['referral', 'rules'] });
    },
  });

  const pinnedLedger = ledgers.length > 0 ? {
    referrerAgentName: '합계',
    baseAmount: ledgers.reduce((s, r) => s + (r.baseAmount ?? 0), 0),
    commissionAmount: ledgers.reduce((s, r) => s + (r.commissionAmount ?? 0), 0),
  } as Partial<ReferralLedgerRow> : undefined;

  const cardStyle = { background: '#fff', borderRadius: RADIUS.lg, border: `1px solid ${GRAY[100]}`, boxShadow: SHADOW.sm };

  return (
    <PageContainer title="소개·이관수수료" description="소개·이관수수료 룰 관리 및 원장 조회">
      {rulesError && (
        <Alert type="warning" showIcon message="API 미응답" description="/api/referral-commissions 를 확인하세요." style={{ marginBottom: 16 }} />
      )}

      <Tabs
        defaultActiveKey="rules"
        items={[
          {
            key: 'rules',
            label: '수수료 룰',
            children: (
              <ProCard style={cardStyle}>
                <div style={{ marginBottom: 12 }}>
                  <PermissionButton menuCode="REFERRAL_COMM" permCode="CREATE" type="primary" onClick={openCreate}>
                    + 룰 등록
                  </PermissionButton>
                </div>
                <DataGrid<ReferralRuleRow>
                  rows={rules}
                  columns={[
                    ...RULE_COLS,
                    {
                      headerName: '액션', width: 160, pinned: 'right',
                      cellRenderer: (p: { data: ReferralRuleRow }) => (
                        <Space>
                          <PermissionButton menuCode="REFERRAL_COMM" permCode="UPDATE" size="small" onClick={() => openEdit(p.data)}>수정</PermissionButton>
                          <PermissionButton menuCode="REFERRAL_COMM" permCode="DELETE" size="small" danger onClick={() => handleDelete(p.data.ruleId)}>삭제</PermissionButton>
                        </Space>
                      ),
                    },
                  ]}
                  loading={rulesLoading}
                  height={520}
                  rowKey="ruleId"
                />
              </ProCard>
            ),
          },
          {
            key: 'ledgers',
            label: '원장',
            children: (
              <>
                <SearchForm
                  conditions={[
                    { type: 'text',  name: 'agentName',  label: '설계사명', span: 6 },
                    { type: 'month', name: 'settleMonth', label: '정산월',   span: 6 },
                  ]}
                  onSearch={(v) => setLedgerParams({ ...v as CommissionSearchParam, pageSize: 200 })}
                  onReset={() => setLedgerParams({ settleMonth: dayjs().format('YYYYMM'), pageSize: 200 })}
                />
                <ProCard style={cardStyle}>
                  <DataGrid<ReferralLedgerRow>
                    rows={ledgers}
                    columns={LEDGER_COLS}
                    loading={ledgersLoading}
                    height={520}
                    rowKey="ledgerId"
                    pinnedBottomRow={pinnedLedger}
                  />
                </ProCard>
              </>
            ),
          },
        ]}
      />

      <Modal
        title={editingRule ? '룰 수정' : '룰 등록'}
        open={ruleModalOpen}
        onOk={handleSave}
        onCancel={() => setRuleModalOpen(false)}
        okText="저장"
        cancelText="취소"
      >
        <Form form={form} layout="vertical">
          <Form.Item name="referralType" label="유형" rules={[{ required: true }]}>
            <Select options={[{ value: 'REFERRAL', label: '소개' }, { value: 'TRANSFER', label: '이관' }]} />
          </Form.Item>
          <Form.Item name="calcType" label="계산방식" rules={[{ required: true }]}>
            <Select options={[{ value: 'RATE', label: '정률' }, { value: 'FIXED', label: '정액' }]} />
          </Form.Item>
          <Form.Item name="commissionRate" label="수수료율(0~1)">
            <InputNumber style={{ width: '100%' }} min={0} max={1} step={0.0001} />
          </Form.Item>
          <Form.Item name="fixedAmount" label="정액">
            <InputNumber style={{ width: '100%' }} min={0} />
          </Form.Item>
          <Form.Item name="effectiveFrom" label="적용시작" rules={[{ required: true }]}>
            <Input placeholder="YYYY-MM-DD" />
          </Form.Item>
          <Form.Item name="effectiveTo" label="적용종료">
            <Input placeholder="YYYY-MM-DD" />
          </Form.Item>
        </Form>
      </Modal>
    </PageContainer>
  );
}
