import Debug from 'debug'
import { ErrorDescEnum, HttpError } from '../classes/HttpError'
import { PrismaClient } from '@prisma/client'
import InvoiceItem from '../classes/InvoiceItem'
import Invoice from '../classes/Invoice'
import { readFileSync } from 'fs'
import dayjs from 'dayjs'
import handlebars from 'handlebars'
import puppeteer from 'puppeteer'

console.log = Debug('invoiceIssuer:func/issueInvoice.ts')

/**
 * POST /invoice
 * @summary 创建一个新的收据
 * @param {number} payerId - 付款人的 ID
 * @param {Date[]} period - 收据的账单周期
 * @param {InvoiceItem[]} items - 收据的项目列表
 * @return {string} - 新收据的 ID
 */
export default async (prisma: PrismaClient, payerId: number, period: Date[], items: InvoiceItem[], dueDate: Date, note?: string) => {
	// 验证付款人是否存在
	const payer = await prisma.payer.findUnique({
		where: {
			payer_id: payerId
		}
	})
	if (!payer) throw new HttpError(ErrorDescEnum.related_item_not_found, 400, ['payer_id'])

	// 在数据库创建新收据
	const payerInfo = {
		id: payer.payer_id,
		name: payer.payer_name,
		address: payer.payer_address,
		abn: payer.payer_abn ? payer.payer_abn : undefined,
		email: payer.payer_email
	}
	const newInvoice = new Invoice(0, new Date(), period, items, dueDate, payerInfo)
	if (note) await newInvoice.setNote(note)
	await newInvoice.save(prisma)

	// 拼接收据编号：INV-yyyymmdd-suffix
	const suffix = newInvoice.suffixCode
	const dateCode = dayjs(newInvoice.issueTime).format('YYYYMMDD')
	const invoiceNumber = `INV-${dateCode}-${suffix}`
	console.log(`New invoice created: ${invoiceNumber}`)

	// 根据模板创建 PDF
	// 从 ../resources/template.html 读取 handlebars 模板
	const template = readFileSync('./src/resources/template.html', 'utf-8')

	// 写入数据
	console.log(payerInfo.address.split('\n')[0])
	const formatAbn = (abn: string) => {
		return abn.replace(/(\d{2})(\d{3})(\d{3})(\d{3})/, '$1 $2 $3 $4')
	}

	const data = {
		invoiceNumber: invoiceNumber,
		invoiceDate: dayjs(newInvoice.issueTime).format('D, MMMM YYYY'),
		payee: JSON.parse(process.env.PAYEE_JSON || '{}') || {
			name: 'Payee Name',
			address: ['Payee Address Line 1', 'Payee Address Line 2'],
			abn: formatAbn('12345678901')
		},
		payer: {
			name: payerInfo.name,
			address_line_one: payerInfo.address.split('\n')[0],
			address_line_two: payerInfo.address.split('\n')[1],
			abn: payerInfo.abn ? formatAbn(payerInfo.abn) : undefined
		},
		billingPeriod: {
			start: dayjs(period[0]).format('D, MMMM YYYY'),
			end: dayjs(period[1]).format('D, MMMM YYYY')
		},
		dueDate: dayjs(dueDate).format('D, MMMM YYYY'),
		amountDue: `\$${newInvoice.getTotal().toFixed(2)}`,
		items: items.map(item => {
			return {
				description: item.description,
				unit: item.unit,
				rate: `\$${(item.unitPrice ?? 0).toFixed(2)}`,
				amount: item.quantity,
				total: `\$${item.getSubtotal().toFixed(2)}`
			}
		}),
		subtotal: `\$${newInvoice.getTotal().toFixed(2)}`,
		paymentInstructions: JSON.parse(process.env.PAYMENT_JSON || '{}') || {
			bankName: 'Bank Name',
			accountName: 'Account Name',
			accountNumber: '123456789',
			bsb: '123456'
		},
		contactEmail: process.env.CONTACT_EMAIL || ''
	}

	// 使用 handlebars 渲染模板
	const render = handlebars.compile(template)
	const html = render(data)

	// 使用 puppeteer 生成 PDF
	const browser = await puppeteer.launch()
	const page = await browser.newPage()
	await page.setContent(html)
	await page.pdf({
		path: `./dist/${invoiceNumber}.pdf`,
		format: 'A4',
		printBackground: true,
		margin: {
			top: '1.5cm',
			right: '1cm',
			bottom: '1cm',
			left: '1cm'
		}
	})
	await browser.close()
}