import { Hono } from 'hono'
import { serveStatic } from 'hono/bun'
import { Cron } from 'croner'
import { parseHTML } from 'linkedom'
import { z } from 'zod'

const units: Record<string, number> = {}

const app = new Hono()

app.use('/*', serveStatic({ root: './dist' }))
app.get('/api/units', (c) => c.json(units))
app.get('*', serveStatic({ root: './dist', path: 'index.html' }))

const updateExchangeRates = async () => {
    const page = await fetch('https://www.cbr.ru/currency_base/daily/').then((d) => d.text())
    const { document } = parseHTML(page)
    const table = document.querySelector('div.table table')
    if (table) {
        const [_header, ...rows] = document.querySelectorAll('tr')

        let amountOfUnits = 0

        const codeParser = z.string().regex(/^[A-Z]{3}$/)
        const amountParser = z.coerce.number().int()
        const priceParser = z
            .string()
            .transform((val) => Number(val.replace('.', '$SPECIAL').replace(',', '.').replace('$SPECIAL', ',')))
            .pipe(z.number())

        for (const row of rows) {
            const rowData: string[] = [...row.children].map((td) => td.textContent!).filter(Boolean)
            const [_numberCode, _code, _amount, _description, _price] = rowData

            try {
                const code = codeParser.parse(_code)
                const amount = amountParser.parse(_amount)
                const price = priceParser.parse(_price)

                units[code] = price / amount
                amountOfUnits++
            } catch (e) {
                console.error(e)
            }
        }

        console.log(`Загружен курс для ${amountOfUnits} валют`)
    } else {
        console.error('При запросе "https://www.cbr.ru/currency_base/daily/" на странице не найдена таблица')
    }
}

updateExchangeRates()

new Cron(
    '0 12 * * *',
    {
        name: 'updateExchangeRate',
        timezone: 'Europe/Moscow',
        catch: (e) => {
            console.error(e)
        },
    },
    updateExchangeRates,
)

export default app