import { useState } from 'react';
import { Button, Field, Input, Textarea } from '../components/ui.jsx';
import { Icon, PageTitle, Toolbar, Panel, ApiNotice, Modal, ConfirmDialog, SimpleTable, KeyValue } from '../components/layout.jsx';
import { gateways } from '../fixtures/devFixtures.js';
import { explainApiError } from '../api.js';

export function VendorsPage({ vendorRows, setVendorRows, addRechargeRecord, apiLoading, apiError, refreshApi, can = () => true, onCreateVendor, onUpdateVendor, onDeleteVendor, onRechargeVendor }) {
  const [showCreateVendor, setShowCreateVendor] = useState(false);
  const [editingVendor, setEditingVendor] = useState(null);
  const [rechargeVendor, setRechargeVendor] = useState(null);
  const [deleteVendorTarget, setDeleteVendorTarget] = useState(null);
  const [newVendor, setNewVendor] = useState({ name: '' });
  const [editVendorForm, setEditVendorForm] = useState({ name: '' });
  const [rechargeForm, setRechargeForm] = useState({ amount: '', remark: '' });
  const [actionError, setActionError] = useState('');
  const canManageVendors = can('vendors.manage');
  const canManageRecharges = can('recharges.manage');
  const parseMoney = (value) => Number(String(value).replace(/[^\d.-]/g, '')) || 0;
  const formatMoney = (value) => `¥${value.toLocaleString('zh-CN', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`;
  const openEditVendor = (vendor) => {
    setEditingVendor(vendor);
    setEditVendorForm({ name: vendor.name || '' });
  };
  const closeEditVendor = () => {
    setEditingVendor(null);
    setEditVendorForm({ name: '' });
  };
  const openRechargeVendor = (vendor) => {
    setRechargeVendor(vendor);
    setRechargeForm({ amount: '', remark: '' });
  };
  const closeRechargeVendor = () => {
    setRechargeVendor(null);
    setRechargeForm({ amount: '', remark: '' });
  };
  const submitVendor = async (event) => {
    event.preventDefault();
    if (!newVendor.name.trim()) return;
    setActionError('');
    try {
      if (onCreateVendor) {
        await onCreateVendor({ name: newVendor.name.trim(), creditLimit: '0.000000' });
      } else {
        const nextIndex = vendorRows.length + 1;
        setVendorRows((rows) => [...rows, { id: `V${String(2000 + nextIndex)}`, name: newVendor.name.trim(), balance: '¥0.00', credit: '¥0', gateways: 0, status: '启用', cycle: '待配置', ratePlan: '待配置', contact: '-', createdAt: '2026-06-19' }]);
      }
      setNewVendor({ name: '' });
      setShowCreateVendor(false);
    } catch (error) {
      setActionError(explainApiError(error));
    }
  };
  const submitEditVendor = async (event) => {
    event.preventDefault();
    if (!editVendorForm.name.trim() || !editingVendor) return;
    setActionError('');
    try {
      if (onUpdateVendor) {
        await onUpdateVendor(editingVendor.id, { name: editVendorForm.name.trim() });
      } else {
        setVendorRows((rows) => rows.map((vendor) => (
          vendor.id === editingVendor.id ? { ...vendor, name: editVendorForm.name.trim() } : vendor
        )));
      }
      closeEditVendor();
    } catch (error) {
      setActionError(explainApiError(error));
    }
  };
  const submitRecharge = async (event) => {
    event.preventDefault();
    const amount = Number(rechargeForm.amount);
    if (!rechargeVendor || !Number.isFinite(amount) || amount <= 0) return;
    setActionError('');
    try {
      if (onRechargeVendor) {
        await onRechargeVendor(rechargeVendor.id, { amount: amount.toFixed(2), remark: rechargeForm.remark.trim() || undefined });
      } else {
        const beforeBalance = parseMoney(rechargeVendor.balance);
        const afterBalance = beforeBalance + amount;
        setVendorRows((rows) => rows.map((vendor) => (
          vendor.id === rechargeVendor.id ? { ...vendor, balance: formatMoney(afterBalance) } : vendor
        )));
        addRechargeRecord({ id: `RCG-V-${Date.now()}`, type: 'vendor', owner: rechargeVendor.name, amount: formatMoney(amount), beforeBalance: formatMoney(beforeBalance), afterBalance: formatMoney(afterBalance), remark: rechargeForm.remark.trim() || '-', operator: '运营管理员', time: new Date().toLocaleString('zh-CN', { hour12: false }), status: '成功' });
      }
      closeRechargeVendor();
    } catch (error) {
      setActionError(explainApiError(error));
    }
  };
  const deleteVendor = async (vendor) => {
    setActionError('');
    try {
      if (onDeleteVendor) {
        await onDeleteVendor(vendor.id);
      } else {
        if ((vendor.gateways ?? 0) > 0) {
          throw new Error('该供应商仍有关联落地网关，不能删除。');
        }
        setVendorRows((rows) => rows.filter((item) => item.id !== vendor.id));
      }
      setDeleteVendorTarget(null);
    } catch (error) {
      setActionError(explainApiError(error));
    }
  };

  return (
    <>
      <PageTitle title="供应商管理" desc="管理供应商账户、余额、授信和充值记录。" actions={canManageVendors ? <Button icon={<Icon type="plus" />} onClick={() => setShowCreateVendor(true)}>新增供应商</Button> : null} />
      <ApiNotice loading={apiLoading} error={apiError || actionError} onRetry={refreshApi} />
      <Toolbar>
        <Field label="供应商名称"><Input placeholder="搜索供应商名称" /></Field>
        <Button icon={<Icon type="search" />}>查询</Button>
      </Toolbar>
      <section className="master-detail">
        <Panel title="供应商列表" className="wide-panel">
          <SimpleTable rows={vendorRows} columns={[
            { key: 'id', label: '供应商 ID', width: '112px', className: 'table-cell-compact' },
            { key: 'name', label: '名称', width: '168px', className: 'table-cell-compact' },
            { key: 'balance', label: '余额' },
            { key: 'credit', label: '授信额度' },
            { key: 'gateways', label: '落地网关数' },
            { key: 'status', label: '状态', status: true },
            {
              key: 'actions',
                label: '操作',
                render: (row) => (
                  <div className="table-actions">
                    {canManageVendors ? <Button size="sm" variant="outline" onClick={() => openEditVendor(row)}>编辑</Button> : null}
                    {canManageRecharges ? <Button size="sm" variant="secondary" onClick={() => openRechargeVendor(row)}>充值</Button> : null}
                    {canManageVendors ? <Button size="sm" variant="danger" onClick={() => setDeleteVendorTarget(row)}>删除</Button> : null}
                    {!canManageVendors && !canManageRecharges ? '-' : null}
                  </div>
                ),
              },
          ]} />
        </Panel>
      </section>
      {showCreateVendor ? (
        <Modal title="新增供应商" onClose={() => setShowCreateVendor(false)} size="sm">
          <form className="modal-form" onSubmit={submitVendor}>
            <Field label={<span>供应商名称 <span className="required-star">*</span></span>}>
              <Input value={newVendor.name} onChange={(event) => setNewVendor({ ...newVendor, name: event.target.value })} placeholder="请输入供应商名称" required />
            </Field>
            <div className="modal-actions">
              <Button type="button" variant="outline" onClick={() => setShowCreateVendor(false)}>取消</Button>
              <Button type="submit">保存供应商</Button>
            </div>
          </form>
        </Modal>
      ) : null}
      {editingVendor ? (
        <Modal title="编辑供应商" onClose={closeEditVendor} size="sm">
          <form className="modal-form" onSubmit={submitEditVendor}>
            <Field label={<span>供应商名称 <span className="required-star">*</span></span>}>
              <Input value={editVendorForm.name} onChange={(event) => setEditVendorForm({ ...editVendorForm, name: event.target.value })} placeholder="请输入供应商名称" required />
            </Field>
            <div className="modal-actions">
              <Button type="button" variant="outline" onClick={closeEditVendor}>取消</Button>
              <Button type="submit">保存修改</Button>
            </div>
          </form>
        </Modal>
      ) : null}
      {rechargeVendor ? (
        <Modal title={`${rechargeVendor.name} 充值`} onClose={closeRechargeVendor} size="sm">
          <form className="modal-form" onSubmit={submitRecharge}>
            <KeyValue label="当前余额" value={rechargeVendor.balance} />
            <Field label={<span>充值金额 <span className="required-star">*</span></span>}>
              <Input type="number" min="0.01" step="0.01" value={rechargeForm.amount} onChange={(event) => setRechargeForm({ ...rechargeForm, amount: event.target.value })} placeholder="请输入充值金额" required />
            </Field>
            <Field label="备注">
              <Textarea rows="4" value={rechargeForm.remark} onChange={(event) => setRechargeForm({ ...rechargeForm, remark: event.target.value })} placeholder="请输入备注" />
            </Field>
            <div className="modal-actions">
              <Button type="button" variant="outline" onClick={closeRechargeVendor}>取消</Button>
              <Button type="submit">确认充值</Button>
            </div>
          </form>
        </Modal>
      ) : null}
      {deleteVendorTarget ? (
        <ConfirmDialog
          title="删除供应商确认"
          confirmLabel="确认删除"
          confirmVariant="danger"
          onCancel={() => setDeleteVendorTarget(null)}
          onConfirm={() => void deleteVendor(deleteVendorTarget)}
        >
          <p>确认删除供应商「{deleteVendorTarget.name}」吗？删除后该供应商将不再出现在供应商列表中。</p>
        </ConfirmDialog>
      ) : null}
    </>
  );
}