import fs from 'node:fs/promises';
import path from 'node:path';

const OPENCODE_PKG_DIR = './packages/opencode';
const TOOLS_DIR = './tools';
const DOCS_AGENTS_DIR = './documentation/docs/20-instructions/.generated';

/**
 * Sync skills from tools/ to opencode package (direct copy)
 */
async function sync_skills() {
	const source = path.join(TOOLS_DIR, 'skills');
	const dest = path.join(OPENCODE_PKG_DIR, 'skills');

	await fs.rm(dest, { recursive: true, force: true });
	await fs.cp(source, dest, { recursive: true });

	console.log('Synced skills to opencode package');
}

/**
 * Sync AGENTS.md from tools/ to opencode package and documentation site
 */
async function sync_agents_md() {
	const source = path.join(TOOLS_DIR, 'instructions', 'AGENTS.md');
	const opencode_dest = path.join(OPENCODE_PKG_DIR, 'instructions', 'opencode-agents.md');
	const docs_dest = path.join(DOCS_AGENTS_DIR, 'agents.md');

	await fs.mkdir(path.dirname(opencode_dest), { recursive: true });
	await fs.mkdir(DOCS_AGENTS_DIR, { recursive: true });

	const content = await fs.readFile(source, 'utf-8');

	await fs.writeFile(opencode_dest, content);
	await fs.writeFile(docs_dest, content);

	console.log('Synced AGENTS.md to opencode package and documentation');
}

interface AgentData {
	name: string;
	description: string;
	prompt: string;
}

/**
 * Parse a markdown agent file with frontmatter (name, description) and body (prompt)
 */
function parse_agent_md(content: string, file_path: string): AgentData | null {
	const frontmatter_match = content.match(/^---\n([\s\S]*?)\n---\n([\s\S]*)$/);
	if (!frontmatter_match) {
		console.warn(`Skipping ${file_path}: no frontmatter found`);
		return null;
	}

	const frontmatter = frontmatter_match[1] ?? '';
	const body = (frontmatter_match[2] ?? '').trim();

	const name = frontmatter.match(/^name:\s*(.+)$/m)?.[1]?.trim();
	const description = frontmatter.match(/^description:\s*(.+)$/m)?.[1]?.trim();

	if (!name || !description) {
		console.warn(`Skipping ${file_path}: missing name or description in frontmatter`);
		return null;
	}

	return { name, description, prompt: body };
}

/**
 * Generate agents.ts module from tools/agents/*.md files
 */
async function sync_agents() {
	const agents_dir = path.join(TOOLS_DIR, 'agents');
	const entries = await fs.readdir(agents_dir, { withFileTypes: true });
	const md_files = entries.filter((e) => e.isFile() && e.name.endsWith('.md'));

	const agents: AgentData[] = [];

	for (const file of md_files) {
		const file_path = path.join(agents_dir, file.name);
		const content = await fs.readFile(file_path, 'utf-8');
		const agent = parse_agent_md(content, file_path);
		if (agent) {
			agents.push(agent);
		}
	}

	const output = [
		'// This file is auto-generated by scripts/sync-opencode-plugin.ts',
		'// Do not edit manually — edit the markdown files in tools/agents/ instead.',
		'',
		`export const agents = ${JSON.stringify(
			Object.fromEntries(
				agents.map((a) => [a.name, { description: a.description, prompt: a.prompt }]),
			),
			null,
			'\t',
		)} as const;`,
		'',
	].join('\n');

	const dest = path.join(OPENCODE_PKG_DIR, 'agents.ts');
	await fs.writeFile(dest, output);

	console.log(`Generated agents.ts with ${agents.length} agent(s)`);
}

await sync_skills();
await sync_agents_md();
await sync_agents();

console.log('OpenCode plugin sync complete');