#!/usr/bin/env node
import {
	cpSync,
	existsSync,
	mkdirSync,
	readFileSync,
	symlinkSync,
} from "node:fs";
import { delimiter, join, relative, resolve } from "node:path";

// SF Startup Loader
// Copyright (c) 2026 Singularity Forge

// Drop the node:sqlite ExperimentalWarning at the source so it never reaches
// stderr. Other ExperimentalWarnings (and all other warning classes) still
// propagate normally. node:sqlite has been experimental since v22 and the
// warning pollutes JSON output of `sf headless query` and similar commands.
{
	const originalEmitWarning = process.emitWarning.bind(process);
	type EmitArgs = Parameters<typeof process.emitWarning>;
	process.emitWarning = ((...args: EmitArgs) => {
		const [warning, typeOrOpts] = args;
		const message = typeof warning === "string" ? warning : warning?.message;
		const name =
			typeof warning === "object" && warning !== null
				? warning.name
				: typeof typeOrOpts === "string"
					? typeOrOpts
					: typeof typeOrOpts === "object" && typeOrOpts !== null
						? (typeOrOpts as { type?: string }).type
						: undefined;
		if (
			name === "ExperimentalWarning" &&
			typeof message === "string" &&
			message.includes("SQLite is an experimental feature")
		) {
			return;
		}
		return originalEmitWarning(...args);
	}) as typeof process.emitWarning;
}

// Fast-path: handle --version/-v and --help/-h before importing any heavy
// dependencies. This avoids loading the entire pi-coding-agent barrel import
// (~1s) just to print a version string.
const sfRootDir = resolve(import.meta.dirname, "..");
const args = process.argv.slice(2);
const firstArg = args[0];

// Read package.json once — reused for version, banner, and SF_VERSION below
let sfVersion = "0.0.0";
try {
	const pkg = JSON.parse(
		readFileSync(join(sfRootDir, "package.json"), "utf-8"),
	);
	sfVersion = pkg.version || "0.0.0";
} catch {
	/* ignore */
}

if (firstArg === "--version" || firstArg === "-v") {
	process.stdout.write(sfVersion + "\n");
	process.exit(0);
}

if (firstArg === "--help" || firstArg === "-h") {
	const { printHelp } = await import("./help-text.js");
	printHelp(sfVersion);
	process.exit(0);
}

if (
	firstArg &&
	firstArg !== "--" &&
	args.slice(1).some((arg) => arg === "--help" || arg === "-h")
) {
	const { printHelp, printSubcommandHelp } = await import("./help-text.js");
	if (!printSubcommandHelp(firstArg, sfVersion)) {
		printHelp(sfVersion);
	}
	process.exit(0);
}

// Fast-path invalid headless invocations before importing cli.ts. These paths
// are commonly used by smoke tests and orchestrators; they should return a
// clear diagnostic without paying extension/resource startup cost.
if (firstArg === "headless") {
	for (let i = 1; i < args.length; i += 1) {
		const arg = args[i];
		if (arg === "--timeout" && i + 1 < args.length) {
			const timeout = parseInt(args[++i], 10);
			if (Number.isNaN(timeout) || timeout < 0) {
				process.stderr.write(
					"[headless] Error: --timeout must be a non-negative integer (milliseconds, 0 to disable)\n",
				);
				process.exit(1);
			}
		}
	}

	if (args.length === 1 && !existsSync(join(process.cwd(), ".sf"))) {
		process.stderr.write(
			"[headless] Error: No .sf/ directory found. Run 'sf headless init' or pass an explicit headless subcommand.\n",
		);
		process.exit(1);
	}
}

// Schedule due-items banner — lightweight check before heavy imports
if (!process.env.SF_QUIET && firstArg !== "--version" && firstArg !== "-v" && firstArg !== "--help" && firstArg !== "-h") {
	try {
		const schedulePath = join(process.cwd(), ".sf", "schedule.jsonl");
		if (existsSync(schedulePath)) {
			const content = readFileSync(schedulePath, "utf-8");
			const now = Date.now();
			let dueCount = 0;
			for (const line of content.split("\n")) {
				if (!line.trim()) continue;
				try {
					const entry = JSON.parse(line);
					if (entry.status === "pending" && new Date(entry.due_at).getTime() <= now) {
						dueCount++;
					}
				} catch {
					// skip corrupt lines
				}
			}
			if (dueCount > 0) {
				process.stderr.write(
					`[forge] ${dueCount} scheduled item${dueCount === 1 ? "" : "s"} due now.  Manage: /sf schedule list\n`,
				);
			}
		}
	} catch {
		// non-fatal
	}
}

// ---------------------------------------------------------------------------
// Runtime dependency checks — fail fast with clear diagnostics before any
// heavy imports. Reads minimum Node version from the engines field in
// package.json (already parsed above) and verifies git is available.
// ---------------------------------------------------------------------------
{
	const MIN_NODE_MAJOR = 24;
	const red = "\x1b[31m";
	const bold = "\x1b[1m";
	const dim = "\x1b[2m";
	const reset = "\x1b[0m";

	// -- Node version --
	const nodeMajor = parseInt(process.versions.node.split(".")[0], 10);
	if (nodeMajor < MIN_NODE_MAJOR) {
		process.stderr.write(
			`\n${red}${bold}Error:${reset} SF requires Node.js >= ${MIN_NODE_MAJOR}.0.0\n` +
				`       You are running Node.js ${process.versions.node}\n\n` +
				`${dim}Install a supported version:${reset}\n` +
				`  nvm install ${MIN_NODE_MAJOR}   ${dim}# if using nvm${reset}\n` +
				`  fnm install ${MIN_NODE_MAJOR}   ${dim}# if using fnm${reset}\n` +
				`  brew install node@${MIN_NODE_MAJOR} ${dim}# macOS Homebrew${reset}\n\n`,
		);
		process.exit(1);
	}

	// -- git --
	try {
		const { execFileSync } = await import("node:child_process");
		execFileSync("git", ["--version"], { stdio: "ignore" });
	} catch {
		process.stderr.write(
			`\n${red}${bold}Error:${reset} SF requires git but it was not found on PATH.\n\n` +
				`${dim}Install git:${reset}\n` +
				`  https://git-scm.com/downloads\n\n`,
		);
		process.exit(1);
	}
}

import { agentDir, appRoot } from "./app-paths.js";
import { serializeBundledExtensionPaths } from "./bundled-extension-paths.js";
import { discoverExtensionEntryPaths } from "./extension-discovery.js";
import {
	isExtensionEnabled,
	loadRegistry,
	readManifestFromEntryPath,
} from "./extension-registry.js";
import { renderLogo } from "./logo.js";
import { applyRtkProcessEnv } from "./rtk.js";

// pkg/ is a shim directory: contains sf's piConfig (package.json) and pi's
// theme assets (dist/modes/interactive/theme/) without a src/ directory.
// This allows config.js to:
//   1. Read piConfig.name → "sf" (branding)
//   2. Resolve themes via dist/ (no src/ present → uses dist path)
const pkgDir = resolve(import.meta.dirname, "..", "pkg");

// MUST be set before any dynamic import of pi SDK fires — this is what config.js
// reads to determine APP_NAME and CONFIG_DIR_NAME
process.env.PI_PACKAGE_DIR = pkgDir;
process.env.PI_SKIP_VERSION_CHECK = "1"; // SF runs its own update check in cli.ts — suppress pi's
process.title = "sf";

// Print branded banner on first launch (before ~/.sf/ exists).
// Set SF_FIRST_RUN_BANNER so cli.ts skips the duplicate welcome screen.
if (!existsSync(appRoot)) {
	const cyan = "\x1b[36m";
	const green = "\x1b[32m";
	const dim = "\x1b[2m";
	const reset = "\x1b[0m";
	const colorCyan = (s: string) => `${cyan}${s}${reset}`;
	process.stderr.write(
		renderLogo(colorCyan) +
			"\n" +
			`  Singularity Forge ${dim}v${sfVersion}${reset}\n` +
			`  ${green}Welcome.${reset} Setting up your environment...\n\n`,
	);
	process.env.SF_FIRST_RUN_BANNER = "1";
}

// SF_CODING_AGENT_DIR — tells pi's getAgentDir() to return ~/.sf/agent/ instead of ~/.sf/agent/
process.env.SF_CODING_AGENT_DIR = agentDir;

// SF_PKG_ROOT — absolute path to sf-run package root. Used by deployed extensions
// (e.g. auto.ts resume path) to import modules like resource-loader.js that live
// in the package tree, not in the deployed ~/.sf/agent/ tree.
process.env.SF_PKG_ROOT = sfRootDir;

// RTK environment — make ~/.sf/agent/bin visible to all child-process paths,
// not just the bash tool, and force-disable RTK telemetry for SF-managed use.
applyRtkProcessEnv(process.env);

// NODE_PATH — make sf's own node_modules available to extensions loaded via jiti.
// Without this, extensions (e.g. browser-tools) can't resolve dependencies like
// `playwright` because jiti resolves modules from pi-coding-agent's location, not sf's.
// Prepending sf's node_modules to NODE_PATH fixes this for all extensions.
const sfNodeModules = join(sfRootDir, "node_modules");
process.env.NODE_PATH = [sfNodeModules, process.env.NODE_PATH]
	.filter(Boolean)
	.join(delimiter);
// Force Node to re-evaluate module search paths with the updated NODE_PATH.
// Must happen synchronously before cli.js imports → extension loading.
// eslint-disable-next-line @typescript-eslint/no-require-imports
const { Module } = await import("node:module");
(Module as any)._initPaths?.();

// SF_VERSION — expose package version so extensions can display it
process.env.SF_VERSION = sfVersion;

// SF_BIN_PATH — absolute path to this loader (dist/loader.js), used by patched subagent
// to spawn sf instead of pi when dispatching workflow tasks.
// Respect a pre-set value so a source-mode wrapper (e.g. bin/sf-from-source) can
// advertise the executable shim instead of the .ts loader path (which spawn() can't exec).
process.env.SF_BIN_PATH = process.env.SF_BIN_PATH || process.argv[1];

// SF_WORKFLOW_PATH — absolute path to bundled SF-WORKFLOW.md, used by patched sf extension
// when dispatching workflow prompts. Prefers dist/resources/ (stable, set at build time)
// over src/resources/ (live working tree) — see resource-loader.ts for rationale.
// Guard: the build sometimes copies dist/resources/extensions/ without the root-level
// markdown files, leaving existsSync(distRes)=true but SF-WORKFLOW.md missing. Fall
// back to src/resources/ when the file itself isn't present in dist.
const distRes = join(sfRootDir, "dist", "resources");
const srcRes = join(sfRootDir, "src", "resources");
const resourcesDir = existsSync(join(distRes, "SF-WORKFLOW.md"))
	? distRes
	: srcRes;
process.env.SF_WORKFLOW_PATH = join(resourcesDir, "SF-WORKFLOW.md");

// SF_BUNDLED_EXTENSION_PATHS — dynamically discovered bundled extension entry points.
// Uses the shared discoverExtensionEntryPaths() to scan the bundled resources
// directory, then remaps discovered paths to agentDir (~/.sf/agent/extensions/)
// where initResources() will sync them.
const bundledExtDir = join(resourcesDir, "extensions");
const agentExtDir = join(agentDir, "extensions");
const registry = loadRegistry();
const discoveredExtensionPaths = discoverExtensionEntryPaths(bundledExtDir)
	.map((entryPath) => join(agentExtDir, relative(bundledExtDir, entryPath)))
	.filter((entryPath) => {
		const manifest = readManifestFromEntryPath(entryPath);
		if (!manifest) return true; // no manifest = always load
		return isExtensionEnabled(registry, manifest.id);
	});

process.env.SF_BUNDLED_EXTENSION_PATHS = serializeBundledExtensionPaths(
	discoveredExtensionPaths,
);

// Respect HTTP_PROXY / HTTPS_PROXY / NO_PROXY env vars for all outbound requests.
// pi-coding-agent's cli.ts sets this, but SF bypasses that entry point — so we
// must set it here before any SDK clients are created.
// Lazy-load undici (~200ms) only when proxy env vars are actually set.
if (
	process.env.HTTP_PROXY ||
	process.env.HTTPS_PROXY ||
	process.env.http_proxy ||
	process.env.https_proxy
) {
	const { EnvHttpProxyAgent, setGlobalDispatcher } = await import("undici");
	setGlobalDispatcher(new EnvHttpProxyAgent());
}

// Ensure workspace packages are linked (or copied on Windows) before importing
// cli.js (which imports @singularity-forge/*).
// npm postinstall handles this normally, but npx --ignore-scripts skips postinstall.
// On Windows without Developer Mode or admin rights, symlinkSync will throw even for
// 'junction' type — so we fall back to cpSync (a full directory copy) which works
// everywhere without elevated permissions.
const sfScopeDir = join(sfNodeModules, "@singularity-forge");
const packagesDir = join(sfRootDir, "packages");
const wsPackages = [
	"native",
	"pi-agent-core",
	"pi-ai",
	"pi-coding-agent",
	"pi-tui",
];
try {
	if (!existsSync(sfScopeDir)) mkdirSync(sfScopeDir, { recursive: true });
	for (const pkg of wsPackages) {
		const target = join(sfScopeDir, pkg);
		const source = join(packagesDir, pkg);
		if (!existsSync(source) || existsSync(target)) continue;
		try {
			symlinkSync(source, target, "junction");
		} catch {
			// Symlink failed (common on Windows without Developer Mode / admin).
			// Fall back to a directory copy — slower on first run but universally works.
			try {
				cpSync(source, target, { recursive: true });
			} catch {
				/* non-fatal */
			}
		}
	}
} catch {
	/* non-fatal */
}

// Validate critical workspace packages are resolvable. If still missing after the
// symlink+copy attempts, emit a clear diagnostic instead of a cryptic
// ERR_MODULE_NOT_FOUND from deep inside cli.js.
const criticalPackages = ["pi-coding-agent"];
const missingPackages = criticalPackages.filter(
	(pkg) => !existsSync(join(sfScopeDir, pkg)),
);
if (missingPackages.length > 0) {
	const missing = missingPackages
		.map((p) => `@singularity-forge/${p}`)
		.join(", ");
	process.stderr.write(
		`\nError: SF installation is broken — missing packages: ${missing}\n\n` +
			`This is usually caused by one of:\n` +
			`  • An outdated version installed from npm (run: npm install -g singularity-foundry@latest)\n` +
			`  • The packages/ directory was excluded from the installed tarball\n` +
			`  • A filesystem error prevented linking or copying the workspace packages\n\n` +
			`Fix it by reinstalling:\n\n` +
			`  npm install -g singularity-foundry@latest\n\n` +
			`If the issue persists, please open an issue at:\n` +
			`  https://github.com/singularity-ng/singularity-foundry/issues\n`,
	);
	process.exit(1);
}

// Dynamic import defers ESM evaluation — config.js will see PI_PACKAGE_DIR above
await import("./cli.js");