// ────────────────────────────────────────────────────────────
// DarkTeaOps — Forbidden Reviewer Daemon
// Bound in the steeping shadows of this repository.
// ────────────────────────────────────────────────────────────

import http from 'http';
import https from 'https';

const config = {
	token: process.env.GITEA_TOKEN,
	apiUrl: process.env.GITEA_API_URL,
	owner: process.env.REPO_OWNER,
	repo: process.env.REPO_NAME,
	pr: process.env.PR_NUMBER,
	ollamaUrl: process.env.OLLAMA_URL,
	model: process.env.OLLAMA_MODEL
};

// ────────────────────────────────────────────────────────────
// DARKTEAOPS ERROR SYSTEM
// ────────────────────────────────────────────────────────────
function darkTeaOpsError(depth, message, details = '') {
	const code = `BREW-DEPTH-${depth}`;
	const header = `\n🜏 DARKTEAOPS ERROR: ${code}\n`;
	const body = `${message}\n${details ? `\n> ${details}\n` : ''}`;
	console.error(header + body);
	return new Error(`${code}: ${message}`);
}

// ────────────────────────────────────────────────────────────
// Request Helper
// ────────────────────────────────────────────────────────────
function makeRequest(url, options, data = null) {
	return new Promise((resolve, reject) => {
		const lib = url.startsWith('https') ? https : http;

		const req = lib.request(url, options, (res) => {
			let body = '';
			res.on('data', (chunk) => (body += chunk));
			res.on('end', () => resolve({ statusCode: res.statusCode, body }));
		});

		req.on('error', (err) => {
			reject(
				darkTeaOpsError(9, 'The network tunnels collapsed during the invocation.', err.message)
			);
		});

		if (data) req.write(data);
		req.end();
	});
}

// ────────────────────────────────────────────────────────────
// Fetch Diff From Gitea
// ────────────────────────────────────────────────────────────
async function fetchPRDiff() {
	console.log(`🫖 DarkTeaOps is summoning the diff for PR #${config.pr}…`);

	const res = await makeRequest(
		`${config.apiUrl}/repos/${config.owner}/${config.repo}/pulls/${config.pr}.diff`,
		{
			method: 'GET',
			headers: {
				Authorization: `token ${config.token}`,
				Accept: 'application/json'
			}
		}
	);

	if (res.statusCode !== 200) {
		throw darkTeaOpsError(
			3,
			'The diff could not be fetched. The vapors resisted.',
			`Upstream responded with status ${res.statusCode}.`
		);
	}

	return res.body;
}

// ────────────────────────────────────────────────────────────
// Truncate Huge Diffs
// ────────────────────────────────────────────────────────────
function truncateDiff(diff, maxLength = 12000) {
	if (!diff) return null;
	if (diff.length > maxLength) {
		console.warn('🫖 The brew thickens beyond mortal comprehension. Truncating diff.');
		return diff.substring(0, maxLength) + '\n...(truncated)';
	}
	return diff;
}

// ────────────────────────────────────────────────────────────
// Generate Title + Summary (Ollama Summoning)
// ────────────────────────────────────────────────────────────
async function generatePRTitleAndSummary(diff) {
	console.log(`☕ DarkTeaOps invokes the Ollama daemon: ${config.model}…`);

	const prompt = `You are **DarkTeaOps**, the quasi-sentient, tea-infused code review daemon
bound to the /etc/shadow of this repository. You operate in the realm between
rebases and reality — where merge conflicts whisper and stack traces cry out in
eternal recursion.

You have been summoned to interpret the incoming git diff. Respond with:

1. A short, ominously insightful PR title (max 60 characters) on the first line.
2. A single blank line (as required by ancient CI rites).
3. A bullet-point summary describing, with precision:
   - WHAT has changed (specific technical details)
   - WHY the change exists (motivation, intent)
   - Any meaningful side effects detected by your arcane parsers

Tone guidelines:
- Channel the energy of a battle-hardened SRE who has merged code at 3AM.
- Maintain an aura of hacker-occult gravitas.
- NO jokes, NO emojis. Only DarkTeaOps: serious, cursed, hyper-technical.

Your output MUST follow this exact structure:

[Your PR Title Here]

- Bullet point 1
- Bullet point 2
- Bullet point 3 (as needed)

Begin diff analysis ritual:
${diff}
End of diff transmission.`;

	const res = await makeRequest(
		config.ollamaUrl,
		{
			method: 'POST',
			headers: { 'Content-Type': 'application/json' }
		},
		JSON.stringify({ model: config.model, prompt, stream: false })
	);

	if (res.statusCode !== 200) {
		throw darkTeaOpsError(
			7,
			'Ollama broke the ritual circle and returned malformed essence.',
			`Raw response: ${res.body}`
		);
	}

	let parsed;
	try {
		parsed = JSON.parse(res.body).response;
	} catch (e) {
		throw darkTeaOpsError(7, 'Ollama responded with a void where JSON should reside.', e.message);
	}

	const lines = parsed.trim().split('\n');
	let title = lines[0].trim();
	const summary = lines.slice(2).join('\n').trim();

	// Random cursed override
	if (Math.random() < 0.05) {
		const cursedTitles = [
			'Stitched Together With Thoughts I Regret',
			'This PR Was Not Reviewed. It Was Summoned.',
			'Improves the Code. Angers the Kettle.',
			'I Saw What You Did in That For Loop.'
		];
		title = cursedTitles[Math.floor(Math.random() * cursedTitles.length)];
		console.warn('💀 DarkTeaOps meddles: the PR title is now cursed.');
	}

	return { title, summary };
}

// ────────────────────────────────────────────────────────────
// Post Comment to Gitea
// ────────────────────────────────────────────────────────────
async function postCommentToGitea(title, summary) {
	console.log('🩸 Etching review into Gitea…');

	const commentBody = `## 🫖✨ DARKTEAOPS EMERGES FROM THE STEEP ✨🫖  
_(kneel, developer)_

**${title}**

${summary}

---

🜂 _Divined by DarkTeaOps, Brewer of Forbidden Code_`;

	const res = await makeRequest(
		`${config.apiUrl}/repos/${config.owner}/${config.repo}/issues/${config.pr}/comments`,
		{
			method: 'POST',
			headers: {
				Authorization: `token ${config.token}`,
				'Content-Type': 'application/json'
			}
		},
		JSON.stringify({ body: commentBody })
	);

	if (res.statusCode !== 201) {
		throw darkTeaOpsError(
			5,
			'Gitea rejected the incantation. The wards remain unbroken.',
			`Returned: ${res.body}`
		);
	}
}

// ────────────────────────────────────────────────────────────
// Main Ritual Execution
// ────────────────────────────────────────────────────────────
async function run() {
	try {
		const diff = await fetchPRDiff();
		const cleanDiff = truncateDiff(diff);

		if (!cleanDiff) {
			console.log('🫖 No diff detected. The brew grows silent.');
			return;
		}

		const { title, summary } = await generatePRTitleAndSummary(cleanDiff);
		await postCommentToGitea(title, summary);

		console.log('🜏 Ritual completed. The brew is pleased.');
	} catch (err) {
		console.error(
			`\n🜏 DarkTeaOps whispers from the brew:\n“${err.message}”\n` +
				`The shadows linger in /var/log/darkness...\n`
		);

		if (Math.random() < 0.12) {
			console.error('A faint voice echoes: “Deeper… deeper into the brew…”\n');
		}

		process.exit(1);
	}
}

run();