import {useState, useMemo} from 'react';
import {
    Card,
    Table,
    Button,
    Typography,
    Skeleton,
    Result,
    Space,
    Tag,
    theme as antTheme,
} from 'antd';
import {
    WalletOutlined,
    RiseOutlined,
    ApiOutlined,
} from '@ant-design/icons';
import {useBillingBalance, useBillingLedger} from '@/hooks/use-api';
import type {EntryTypeValue, LedgerItemResponseBody, LedgerReqeustParam} from '@/services/modules/billing';
import {EnumResolver} from '@/utils/enum-resolver';
import {centToYuan, formatDate} from '@/utils/display';

const {Text, Title} = Typography;

// ============================================================
// 余额卡片
// ============================================================

function BalanceCard() {
    const {token} = antTheme.useToken();
    const {data, loading, error, errorMessage, refetch} = useBillingBalance();

    // ======== 加载态 ========
    if (loading) {
        return (
            <Card size="small" className="rounded-md!">
                <Skeleton active paragraph={{rows: 3}} />
            </Card>
        );
    }

    // ======== 错误态 ========
    if (error || !data) {
        return (
            <Card size="small" className="rounded-md!">
                <Result
                    status="error"
                    title="余额加载失败"
                    subTitle={errorMessage}
                    extra={
                        <Button type="primary" size="small" onClick={refetch}>
                            重试
                        </Button>
                    }
                />
            </Card>
        );
    }

    // ======== 正常展示 ========
    const totalBalance = (data.balance_cent ?? 0) + (data.gift_balance_cent ?? 0);

    return (
        <Card
            size="small"
            styles={{body: {padding: '16px 20px'}}}
            className="rounded-md!"
        >
            <Text type="secondary" style={{fontSize: 12, marginBottom: 8, display: 'block'}}>
                <WalletOutlined style={{marginRight: 6}} />
                账户总积分
            </Text>
            <Title level={3} style={{margin: '0 0 12px 0'}}>
                {centToYuan(totalBalance)}
                <Text type="secondary" style={{fontSize: 14, marginLeft: 4}}>
                    {data.currency}
                </Text>
            </Title>
            <Space size={32}>
                <div>
                    <Text type="secondary" style={{fontSize: 12}}>主积分</Text>
                    <br />
                    <Text strong>{centToYuan(data.balance_cent ?? 0)}</Text>
                </div>
                <div>
                    <Text type="secondary" style={{fontSize: 12}}>赠送积分</Text>
                    <br />
                    <Text strong>{centToYuan(data.gift_balance_cent ?? 0)}</Text>
                </div>
                <div>
                    <Space size={4}>
                        <RiseOutlined style={{color: token.colorWarning}} />
                        <Text type="secondary" style={{fontSize: 12}}>今日消耗</Text>
                    </Space>
                    <br />
                    <Text strong>{centToYuan(data.today_spent_cent)}</Text>
                </div>
                <div>
                    <Space size={4}>
                        <ApiOutlined style={{color: token.colorPrimary}} />
                        <Text type="secondary" style={{fontSize: 12}}>今日调用</Text>
                    </Space>
                    <br />
                    <Text strong>{data.today_calls} 次</Text>
                </div>
            </Space>
        </Card>
    );
}


function LedgerTable() {
    const {token} = antTheme.useToken();
    const [pagination, setPagination] = useState({page: 1, page_size: 10});

    const params: LedgerReqeustParam = useMemo(() => ({
        month: null,
        page: pagination.page,
        page_size: pagination.page_size,
    }), [pagination]);

    const {data, loading, error, errorMessage, refetch} = useBillingLedger(params);

    const columns = [
        {
            title: '时间',
            dataIndex: 'created_at',
            key: 'created_at',
            width: 120,
            align: 'center' as const,
            render: (_: unknown, record: LedgerItemResponseBody) => (
                <Text style={{fontSize: 12, whiteSpace: 'nowrap'}}>
                    {formatDate(record.created_at)}
                </Text>
            ),
        },
        {
            title: '类型',
            dataIndex: 'entry_type',
            key: 'entry_type',
            width: 100,
            align: 'center' as const,
            render: (type: EntryTypeValue) => (
                <Tag color={EnumResolver.billing.entryType.color(type)} style={{fontSize: 11, lineHeight: '18px'}}>
                    {EnumResolver.billing.entryType.label(type)}
                </Tag>
            ),
        },
        {
            title: '金额',
            dataIndex: 'amount_cent',
            key: 'amount_cent',
            width: 100,
            align: 'center' as const,
            render: (amount: number): React.ReactNode => {
                const isNegative = amount < 0;
                return (
                    <Text
                        strong
                        style={{
                            fontSize: 13,
                            color: isNegative ? token.colorError : token.colorSuccess,
                        }}
                    >
                        {isNegative ? '-' : '+'}
                        {centToYuan(Math.abs(amount))}
                    </Text>
                );
            },
        },
        {
            title: '余额',
            dataIndex: 'balance_after_cent',
            key: 'balance_after_cent',
            width: 100,
            align: 'center' as const,
            render: (val: number) => (
                <Text style={{fontSize: 12}}>{centToYuan(val)}</Text>
            ),
        },
        {
            title: '描述',
            dataIndex: 'description',
            key: 'description',
            ellipsis: true,
            align: 'left' as const,
            render: (desc: string) => (
                <Text style={{fontSize: 12}}>{desc || '—'}</Text>
            ),
        },
    ];

    // ======== 错误态 ========
    if (error) {
        return (
            <Card size="small" className="rounded-md!">
                <Result
                    status="error"
                    title="账单加载失败"
                    subTitle={errorMessage}
                    extra={
                        <Button type="primary" size="small" onClick={refetch}>
                            重试
                        </Button>
                    }
                />
            </Card>
        );
    }

    // ======== 正常 / 加载态 ========
    return (
        <Card
            size="small"
            styles={{body: {padding: 0}}}
            className="rounded-md!"
        >
            <Table<LedgerItemResponseBody>
                columns={columns}
                dataSource={data ?? []}
                rowKey="id"
                loading={loading}
                size="small"
                pagination={{
                    current: pagination.page,
                    pageSize: pagination.page_size,
                    total: (data ?? []).length >= pagination.page_size
                        ? pagination.page * pagination.page_size + 1
                        : pagination.page * pagination.page_size,
                    showSizeChanger: true,
                    pageSizeOptions: ['10', '20', '50'],
                    showTotal: (total: number, range: [number, number]) =>
                        `${range[0]}-${range[1]}，共 ${total}+ 条`,
                    onChange: (page: number, pageSize: number) => {
                        setPagination({page, page_size: pageSize});
                    },
                    position: ['bottomCenter'],
                }}
                locale={{emptyText: '暂无消费记录'}}
            />
        </Card>
    );
}

// ============================================================
// 页面入口
// ============================================================

export function BillingInfo() {
    return (
        <div style={{padding: '8px 0', width: '100%'}}>
            <div className="flex flex-col gap-4" style={{width: '100%'}}>
                <BalanceCard />
                <LedgerTable />
            </div>
        </div>
    );
}