#!/usr/bin/env node
import { initProject } from "./init.js";
import { patchFile } from "./patch.js";
import { validateMaps } from "./validate.js";
import { reinitPath } from "./init.js";
import { discoverProject } from "./discover.js";
import { createLLMClient, LLMError } from "./llm-client.js";
import { loadConfig } from "./config.js";
import pc from "picocolors";

const args = process.argv.slice(2);
const command = args[0];

function printUsage() {
	console.log(`${pc.bold("project-map")} — hierarchical project analysis for Pi agents
`);
	console.log(`${pc.bold("Usage:")}`);
	console.log(
		`  project-map ${pc.cyan("init")} [path]            Generate .pi-map.md files for all directories`,
	);
	console.log(
		`  project-map ${pc.cyan("patch")} <file>            Update analysis for a changed file's directory`,
	);
	console.log(
		`  project-map ${pc.cyan("validate")} [--fix] [path]  Check for stale/missing/orphaned entries`,
	);
	console.log(
		`  project-map ${pc.cyan("reinit")} [path]           Force full regeneration`,
	);
	console.log(
		`  project-map ${pc.cyan("--help")}                 Show this help message`,
	);
	console.log(
		`  project-map ${pc.cyan("--version")}              Show version\n`,
	);
	console.log(`${pc.bold("Options:")}`);
	console.log(
		`  --llm-provider=openai|kimi  LLM provider (default: config or openai)`,
	);
	console.log(
		`  --llm-model=<model>         LLM model name (or set LLM_MODEL env var)`,
	);
	console.log(`  --llm-base-url=<url>        Custom base URL for LLM API\n`);
	console.log(`${pc.bold("Examples:")}`);
	console.log(`  project-map init`);
	console.log(`  project-map patch src/components/Button.tsx`);
	console.log(`  project-map validate --fix`);
	console.log(`  project-map reinit`);
	console.log(
		`  project-map init --llm-provider=kimi --llm-model=kimi-k2-6`,
	);
}

function printVersion() {
	const pkg = require("../package.json");
	console.log(pkg.version);
}

function formatCount(count: number, label: string): string {
	const plural = label.endsWith("y")
		? `${label.slice(0, -1)}ies`
		: `${label}${count === 1 ? "" : "s"}`;
	return `${pc.bold(String(count))} ${count === 1 ? label : plural}`;
}

function parseArgs(args: string[]): {
	path: string;
	fix: boolean;
	llmProvider?: string;
	llmModel?: string;
	llmBaseUrl?: string;
	positional: string[];
} {
	let path = ".";
	let fix = false;
	let llmProvider: string | undefined;
	let llmModel: string | undefined;
	let llmBaseUrl: string | undefined;
	const positional: string[] = [];

	for (const arg of args.slice(1)) {
		if (arg === "--fix") {
			fix = true;
		} else if (arg.startsWith("--llm-provider=")) {
			llmProvider = arg.slice("--llm-provider=".length);
		} else if (arg.startsWith("--llm-model=")) {
			llmModel = arg.slice("--llm-model=".length);
		} else if (arg.startsWith("--llm-base-url=")) {
			llmBaseUrl = arg.slice("--llm-base-url=".length);
		} else if (!arg.startsWith("-")) {
			positional.push(arg);
			path = arg;
		}
	}

	return { path, fix, llmProvider, llmModel, llmBaseUrl, positional };
}

function createClientFromArgs(args: ReturnType<typeof parseArgs>) {
	const config = loadConfig();
	const provider = (args.llmProvider || config.llmProvider) as
		| "openai"
		| "kimi"
		| "pi";
	return createLLMClient(provider, {
		model: args.llmModel || config.llmModel || process.env.LLM_MODEL,
		baseUrl: args.llmBaseUrl || config.llmBaseUrl,
	});
}

async function main() {
	if (!command || command === "--help" || command === "-h") {
		printUsage();
		process.exit(0);
	}

	if (command === "--version" || command === "-v") {
		printVersion();
		process.exit(0);
	}

	const parsed = parseArgs(args);

	switch (command) {
		case "init": {
			const targetPath = parsed.positional[0] || ".";
			const start = Date.now();
			const entries = discoverProject(targetPath);
			console.log(`Scanning ${formatCount(entries.length, "directory")}...`);
			const client = createClientFromArgs(parsed);
			await initProject(targetPath, { verbose: false, llmClient: client, cacheDir: targetPath });
			const elapsed = ((Date.now() - start) / 1000).toFixed(1);
			console.log(
				`${pc.green("✓")} Generated ${formatCount(entries.length, ".pi-map.md file")} in ${elapsed}s`,
			);
			break;
		}
		case "patch": {
			if (!parsed.positional[0]) {
				console.error(
					`${pc.red("Error:")} Missing file path. Usage: project-map patch <file>`,
				);
				process.exit(1);
			}
			const client = createClientFromArgs(parsed);
			await patchFile(parsed.positional[0], client, process.cwd());
			console.log(`${pc.green("✓")} Patched`);
			break;
		}
		case "validate": {
			const { path, fix } = parsed;
			const result = await validateMaps(path, { fix, verbose: true });
			if (result.clean) {
				console.log(`${pc.green("✓")} All .pi-map.md files are clean.`);
			} else {
				const counts: Record<string, number> = {};
				for (const d of result.discrepancies) {
					counts[d.type] = (counts[d.type] || 0) + 1;
				}
				const summary = Object.entries(counts)
					.map(([type, count]) => `${count} ${type}`)
					.join(", ");
				const fixMsg =
					fix && result.fixed !== undefined
						? ` (${pc.green("✓")} fixed ${formatCount(result.fixed, "directory")})`
						: "";
				console.log(
					`${pc.yellow("⚠")} Found ${formatCount(result.discrepancies.length, "discrepancy")}: ${summary}${fixMsg}`,
				);
			}
			process.exit(result.clean ? 0 : 1);
			break;
		}
		case "reinit": {
			const targetPath = parsed.positional[0] || ".";
			const start = Date.now();
			const entries = discoverProject(targetPath);
			console.log(
				`Regenerating ${formatCount(entries.length, ".pi-map.md file")}...`,
			);
			const client = createClientFromArgs(parsed);
			await reinitPath(targetPath, { verbose: false, llmClient: client, cacheDir: targetPath });
			const elapsed = ((Date.now() - start) / 1000).toFixed(1);
			console.log(`${pc.green("✓")} Regenerated in ${elapsed}s`);
			break;
		}
		default:
			console.error(`${pc.red("Error:")} Unknown command "${command}"`);
			console.error(`Run ${pc.cyan("project-map --help")} for usage.`);
			process.exit(1);
	}
}

main().catch((err) => {
	if (err instanceof LLMError) {
		console.error(`${pc.red("LLM Error:")} ${err.message}`);
	} else {
		console.error(`${pc.red("Error:")} ${err.message}`);
	}
	process.exit(1);
});