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]
		})
	)
}

async function getLanguages(owner, repo) {
	const languagesResp = await fetch(
		`${forgejoBaseUrl}/api/v1/repos/${encodeURIComponent(
			owner
		)}/${encodeURIComponent(repo)}/languages`
	)
	if (languagesResp.ok) {
		return getLanguagePercentages(await languagesResp.json())
	}
	return {}
}

app.get('/:owner/:repo', async function (req, res) {
	const [repoResp, commitsResp, languages] = await Promise.all([
		fetch(
			`${forgejoBaseUrl}/api/v1/repos/${encodeURIComponent(
				req.params.owner
			)}/${encodeURIComponent(req.params.repo)}`
		),
		fetch(
			`${forgejoBaseUrl}/api/v1/repos/${encodeURIComponent(
				req.params.owner
			)}/${encodeURIComponent(req.params.repo)}/commits?limit=1`
		),
		getLanguages(req.params.owner, req.params.repo)
	])
	if (!repoResp.ok) {
		res.status(repoResp.status)
		res.end()
		return
	}
	const repo = await repoResp.json()
	repo.commits_count =
		Number.parseInt(commitsResp.headers.get('x-total-count')) || 0
	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, languages] = await Promise.all([
		fetch(
			`${forgejoBaseUrl}/api/v1/repos/${encodeURIComponent(
				req.params.owner
			)}/${encodeURIComponent(
				req.params.repo
			)}/git/commits/${encodeURIComponent(req.params.hash)}`
		),
		getLanguages(req.params.owner, req.params.repo)
	])
	if (!commitResp.ok) {
		res.status(commitResp.status)
		res.end()
		return
	}
	const commit = await commitResp.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/:type/:num', (req, res, next) => {
	if (req.params.type != 'pull' && req.params.type != 'issue') return next()
	res.redirect(
		`/${req.params.owner}/${req.params.repo}/${req.params.type}s/${req.params.num}`
	)
})

app.get('/:owner/:repo/issues/:num', async function (req, res) {
	const [issueResp, languages] = await Promise.all([
		fetch(
			`${forgejoBaseUrl}/api/v1/repos/${encodeURIComponent(
				req.params.owner
			)}/${encodeURIComponent(req.params.repo)}/issues/${encodeURIComponent(
				req.params.num
			)}`
		),
		getLanguages(req.params.owner, req.params.repo)
	])
	if (!issueResp.ok) {
		res.status(issueResp.status)
		res.end()
		return
	}
	const issue = await issueResp.json()
	if (issue.pull_request) {
		res.redirect(
			`/${req.params.owner}/${req.params.repo}/pulls/${req.params.num}`
		)
		return
	}
	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))
})

app.get('/:owner/:repo/pulls/:num', async function (req, res) {
	const [pullResp, pullCommitsResp, languages] = await Promise.all([
		fetch(
			`${forgejoBaseUrl}/api/v1/repos/${encodeURIComponent(
				req.params.owner
			)}/${encodeURIComponent(req.params.repo)}/pulls/${encodeURIComponent(
				req.params.num
			)}`
		),
		fetch(
			`${forgejoBaseUrl}/api/v1/repos/${encodeURIComponent(
				req.params.owner
			)}/${encodeURIComponent(req.params.repo)}/pulls/${encodeURIComponent(
				req.params.num
			)}/commits?limit=0`
		),
		getLanguages(req.params.owner, req.params.repo)
	])
	if (!pullResp.ok || !pullCommitsResp.ok) {
		res.status(pullResp.status)
		res.end()
		return
	}
	const [pull, commits] = await Promise.all([
		pullResp.json(),
		pullCommitsResp.json()
	])
	pull.commits_count =
		Number.parseInt(pullCommitsResp.headers.get('x-total-count')) || 0
	const stats = { total: 0, additions: 0, deletions: 0 }
	for (const commit of commits) {
		stats.total += commit.stats.total
		stats.additions += commit.stats.additions
		stats.deletions += commit.stats.deletions
	}
	const html = await eta.renderAsync('issue', {
		issue: pull,
		prStats: stats,
		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}`)
})