import net from 'net'
import iconv from 'iconv-lite'

export function printReceipt(printerIp, order) {
    return new Promise((resolve) => {
        const socket = new net.Socket()
        socket.setTimeout(8000)

        socket.connect(9100, printerIp, () => {
            // 打印机复位
            socket.write(Buffer.from([0x1B, 0x40]))

            // ==========================================
            // 全局配置：58mm 一行固定 32 个字符
            // ==========================================
            const lineWidth = 32
            const line = '================================'.substring(0, lineWidth)
            const lineMin = '--------------------------------'.substring(0, lineWidth)

            // 居中函数
            const center = (str) => {
                const s = String(str)
                const len = s.length
                const pad = Math.max(0, Math.floor((lineWidth - len) / 2))
                return ' '.repeat(pad) + s + '\n'
            }

            // ==========================================
            // 标题：店名 + 结算单 + 桌号 → 全部居中对齐
            // ==========================================
            socket.write(Buffer.from([0x1B, 0x21, 0x11])) // 放大店名
            socket.write(iconv.encode(center(order.shop_name), 'gbk'))
            socket.write(Buffer.from([0x1B, 0x21, 0x00])) // 恢复正常

            socket.write(iconv.encode(center(`结算单 #${order.orderInfo.orderNum}`), 'gbk'))
            socket.write(iconv.encode(center(`桌号：${order.orderInfo.tableName || ''}`), 'gbk'))
            socket.write(iconv.encode(line + '\n', 'gbk'))

            // ==========================================
            // 订单信息（全部撑满宽度）
            // ==========================================
            let content = ''
            content += `订单号：${order.orderInfo.orderNo}\n`
            content += `交易时间：${order.createdAt}\n`
            content += `收银员：${order.loginAccount}\n`
            content += lineMin + '\n'

            // ==========================================
            // 商品表格：完全对齐、撑满宽度
            // ==========================================
            content += '品名      单价      数量     小计\n'
            content += lineMin + '\n'

            order.carts.forEach(item => {
                let name = String(item.name || '').substring(0, 10).padEnd(10, ' ')
                let price = String(item.salePrice || '0.00').padStart(6, ' ')
                let num = String(item.number || 1).padStart(3, ' ')
                let total = String(item.totalAmount || '0.00').padStart(3, ' ')
                content += name + price + num + total + '\n'
            })

            content += lineMin + '\n'

            // ==========================================
            // 金额信息
            // ==========================================
            content += `原价：${order.originAmount}\n`
            content += `折扣：${order.discountAllAmount}\n`

            // 发送前面内容
            socket.write(iconv.encode(content, 'gbk'))

            // 实付放大
            socket.write(Buffer.from([0x1B, 0x21, 0x11]))
            socket.write(iconv.encode(`实付：${order.orderAmount}\n`, 'gbk'))
            socket.write(Buffer.from([0x1B, 0x21, 0x00]))

            // 底部信息
            let bottom = ''
            bottom += `备注：${order.remark || '无'}\n`
            bottom += `打印时间：${order.printTime}\n`
            bottom += line + '\n'
            bottom += '\n\n\n\n\n\n'

            socket.write(iconv.encode(bottom, 'gbk'))

            // 只切纸一次
            socket.write(Buffer.from([0x1D, 0x56, 0x00]))

            setTimeout(() => {
                socket.end()
                resolve('ok')
            }, 400)
        })

        socket.on('error', () => { })
        socket.on('close', () => { })
        socket.on('timeout', () => socket.destroy())
    })
}