import express from "express";
import { actions } from "./actions.mjs";
import { enqueue, get_entry, list_pending, resolve } from "./queue.mjs";
import { load_secrets } from "./secrets.mjs";
import { create_auth_middleware, check_can_approve } from "./auth.mjs";

const PORT = process.env.CONDUIT_PORT || 3015;

function get_arg(argv, flag) {
	const i = argv.indexOf(flag);
	return i !== -1 ? argv[i + 1] : null;
}

const secrets_path = get_arg(process.argv, "--secrets");
let secrets;
try {
	secrets = load_secrets(secrets_path);
} catch (err) {
	console.error(`Fatal: ${err.message}`);
	process.exit(1);
}
const { users } = secrets;

const app = express();
app.use(express.json({
	verify: (req, _res, buf) => {
		req.raw_body = buf.toString("utf8");
	},
}));
app.use(create_auth_middleware(users));

function validate_params(action_def, params) {
	const errors = [];
	for (const p of action_def.params) {
		if (p.required && (params[p.name] === undefined || params[p.name] === null)) {
			errors.push(`Missing required param: ${p.name}`);
		}
	}
	return errors;
}

// POST /action  — main entry point
app.post("/action", async (req, res) => {
	const { action, ...params } = req.body ?? {};

	if (!action) {
		return res.status(400).json({ error: "Missing 'action' field" });
	}

	const def = actions[action];
	if (!def) {
		return res.status(404).json({ error: `Unknown action: ${action}` });
	}

	const errors = validate_params(def, params);
	if (errors.length) {
		return res.status(400).json({ error: "Invalid params", details: errors });
	}

	if (def.policy === "auto-deny") {
		return res.status(403).json({ status: "denied", reason: "Policy: auto-deny" });
	}

	if (def.policy === "auto-accept") {
		try {
			const result = await def.handler(params);
			return res.json({ status: "accepted", result });
		} catch (err) {
			return res.status(500).json({ status: "error", error: err.message });
		}
	}

	if (def.policy === "queue") {
		const id = enqueue(action, params, req.conduit_user);
		return res.status(202).json({ status: "queued", id });
	}
});

// GET /queue — list pending items
app.get("/queue", (req, res) => {
	res.json(list_pending());
});

// POST /queue/:id/approve — user approves a queued action
app.post("/queue/:id/approve", async (req, res) => {
	const entry = get_entry(req.params.id);
	if (!entry) {
		return res.status(404).json({ error: "Not found" });
	}
	if (entry.status !== "pending") {
		return res.status(409).json({ error: "Already resolved" });
	}
	if (!check_can_approve(users, req.conduit_user, entry.submitted_by)) {
		return res.status(403).json({ error: "Not authorized to approve this entry" });
	}

	resolve(req.params.id, "approved");

	const def = actions[entry.action];
	try {
		const result = await def.handler(entry.params);
		res.json({ status: "approved", result });
	} catch (err) {
		res.status(500).json({ status: "error", error: err.message });
	}
});

// POST /queue/:id/deny — user denies a queued action
app.post("/queue/:id/deny", (req, res) => {
	const entry = get_entry(req.params.id);
	if (!entry) {
		return res.status(404).json({ error: "Not found" });
	}
	if (entry.status !== "pending") {
		return res.status(409).json({ error: "Already resolved" });
	}
	if (!check_can_approve(users, req.conduit_user, entry.submitted_by)) {
		return res.status(403).json({ error: "Not authorized to deny this entry" });
	}

	resolve(req.params.id, "denied");
	res.json({ status: "denied" });
});

app.listen(PORT, () => {
	console.log(`claude-code-conduit server running on port ${PORT}`);
	console.log(`Workspace root: ${process.env.CONDUIT_ROOT || "/workspace"}`);
});