import 'dotenv/config'
import express from 'express'
import { Eta } from 'eta'
import render, { renderHtml } from './lib/render.js'
import languageColors from './lib/languagecolors.js'
import fetch from 'node-fetch'
// satori is using the native fetch api, causing a warning, so make node-fetch the default
globalThis.fetch = fetch

const forgejoBaseUrl = process.env.FORGEJO_BASE_URL
if (!forgejoBaseUrl) throw new Error('FORGEJO_BASE_URL unspecified')

const debug = process.env.DEBUG ? true : false

const eta = new Eta({
	views: 'views',
	cache: !debug
})

const app = express()

app.get('/', function (req, res) {
	res.redirect('https://git.gay/gitgay/og.git')
})

function getLanguagePercentages(languages) {
	let sum = 0
	const values = Object.values(languages)
	for (const value of values) {
		sum += value
	}
	return Object.fromEntries(
		Object.keys(languages).map(language => {
			return [language, (languages[language] / sum) * 100]
		})
	)
}

app.get('/:owner/:repo', async function (req, res) {
	const repoResp = await fetch(
		`${forgejoBaseUrl}/api/v1/repos/${encodeURIComponent(
			req.params.owner
		)}/${encodeURIComponent(req.params.repo)}`
	)
	if (!repoResp.ok) {
		res.status(repoResp.status)
		res.end()
		return
	}
	const repo = await repoResp.json()
	let languages = {}
	if (!repo.empty && repo.languages_url) {
		const languagesResp = await fetch(
			`${forgejoBaseUrl}/api/v1/repos/${encodeURIComponent(
				req.params.owner
			)}/${encodeURIComponent(req.params.repo)}/languages`
		)
		if (languagesResp.ok) {
			languages = getLanguagePercentages(await languagesResp.json())
		}
	}
	const html = await eta.renderAsync('repo', {
		repo,
		languages,
		languageColors,
		debug
	})
	if (debug) {
		res.send(await renderHtml(html))
		return
	}
	res.type('png')
	res.set('Content-Disposition', 'inline')
	res.send(await render(html))
})

app.get('/:owner/:repo/commit/:hash', async function (req, res) {
	const commitResp = await fetch(
		`${forgejoBaseUrl}/api/v1/repos/${encodeURIComponent(
			req.params.owner
		)}/${encodeURIComponent(req.params.repo)}/git/commits/${encodeURIComponent(
			req.params.hash
		)}`
	)
	if (!commitResp.ok) {
		res.status(commitResp.status)
		res.end()
		return
	}
	const commit = await commitResp.json()
	let languages = {}
	const languagesResp = await fetch(
		`${forgejoBaseUrl}/api/v1/repos/${encodeURIComponent(
			req.params.owner
		)}/${encodeURIComponent(req.params.repo)}/languages`
	)
	if (languagesResp.ok) {
		languages = getLanguagePercentages(await languagesResp.json())
	}
	const html = await eta.renderAsync('commit', {
		commit: {
			...commit.commit,
			sha: commit.sha,
			repository: {
				full_name: `${req.params.owner}/${req.params.repo}`
			},
			committer: commit.committer,
			stats: commit.stats,
			created_at: commit.created
		},
		languages,
		languageColors,
		debug
	})
	if (debug) {
		res.send(await renderHtml(html))
		return
	}
	res.type('png')
	res.set('Content-Disposition', 'inline')
	res.send(await render(html))
})

app.get('/:owner/:repo/issue/:num', async function (req, res) {
	const issueResp = await fetch(
		`${forgejoBaseUrl}/api/v1/repos/${encodeURIComponent(
			req.params.owner
		)}/${encodeURIComponent(req.params.repo)}/issues/${encodeURIComponent(
			req.params.num
		)}`
	)
	if (!issueResp.ok) {
		res.status(issueResp.status)
		res.end()
		return
	}
	const issue = await issueResp.json()
	let languages = {}
	const languagesResp = await fetch(
		`${forgejoBaseUrl}/api/v1/repos/${encodeURIComponent(
			req.params.owner
		)}/${encodeURIComponent(req.params.repo)}/languages`
	)
	if (languagesResp.ok) {
		languages = getLanguagePercentages(await languagesResp.json())
	}
	const html = await eta.renderAsync('issue', {
		issue,
		languages,
		languageColors,
		debug
	})
	if (debug) {
		res.send(await renderHtml(html))
		return
	}
	res.type('png')
	res.set('Content-Disposition', 'inline')
	res.send(await render(html))
})

const [port, host] = [process.env.PORT ?? 9054, process.env.HOST ?? '127.0.0.1']

app.listen(port, host, () => {
	console.log(`Listening on http://${host}:${port}`)
})