import path from "node:path";
import type {
	API,
	Auth,
	Backend,
	CLIInput,
	Database,
	DatabaseSetup,
	ORM,
	PackageManager,
	Payments,
	ProjectConfig,
	Runtime,
	ServerDeploy,
	WebDeploy,
} from "../types";

export function processArrayOption<T>(options: (T | "none")[] | undefined) {
	if (!options || options.length === 0) return [];
	if (options.includes("none" as T | "none")) return [];
	return options.filter((item): item is T => item !== "none");
}

export function deriveProjectName(
	projectName?: string,
	projectDirectory?: string,
) {
	if (projectName) {
		return projectName;
	}
	if (projectDirectory) {
		return path.basename(path.resolve(process.cwd(), projectDirectory));
	}
	return "";
}

export function processFlags(options: CLIInput, projectName?: string) {
	const config: Partial<ProjectConfig> = {};

	if (options.api) {
		config.api = options.api as API;
	}

	if (options.backend) {
		config.backend = options.backend as Backend;
	}

	if (options.database) {
		config.database = options.database as Database;
	}

	if (options.orm) {
		config.orm = options.orm as ORM;
	}

	if (options.auth !== undefined) {
		config.auth = options.auth as Auth;
	}

	if (options.payments !== undefined) {
		config.payments = options.payments as Payments;
	}

	if (options.git !== undefined) {
		config.git = options.git;
	}

	if (options.install !== undefined) {
		config.install = options.install;
	}

	if (options.runtime) {
		config.runtime = options.runtime as Runtime;
	}

	if (options.dbSetup) {
		config.dbSetup = options.dbSetup as DatabaseSetup;
	}

	if (options.packageManager) {
		config.packageManager = options.packageManager as PackageManager;
	}

	if (options.webDeploy) {
		config.webDeploy = options.webDeploy as WebDeploy;
	}

	if (options.serverDeploy) {
		config.serverDeploy = options.serverDeploy as ServerDeploy;
	}

	const derivedName = deriveProjectName(projectName, options.projectDirectory);
	if (derivedName) {
		config.projectName = projectName || derivedName;
	}

	if (options.frontend && options.frontend.length > 0) {
		config.frontend = processArrayOption(options.frontend);
	}

	if (options.addons && options.addons.length > 0) {
		config.addons = processArrayOption(options.addons);
	}

	if (options.examples && options.examples.length > 0) {
		config.examples = processArrayOption(options.examples);
	}

	return config;
}

export function getProvidedFlags(options: CLIInput) {
	return new Set(
		Object.keys(options).filter(
			(key) => options[key as keyof CLIInput] !== undefined,
		),
	);
}

export function validateNoneExclusivity<T>(
	options: (T | "none")[] | undefined,
	optionName: string,
) {
	if (!options || options.length === 0) return;

	if (options.includes("none" as T | "none") && options.length > 1) {
		throw new Error(`Cannot combine 'none' with other ${optionName}.`);
	}
}

export function validateArrayOptions(options: CLIInput) {
	validateNoneExclusivity(options.frontend, "frontend options");
	validateNoneExclusivity(options.addons, "addons");
	validateNoneExclusivity(options.examples, "examples");
}