/**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

/* eslint-disable no-restricted-syntax */

'use strict';

// MODULES //

var resolve = require( 'path' ).resolve;
var exec = require( 'child_process' ).exec;
var tape = require( 'tape' );
var IS_BROWSER = require( '@stdlib/assert/is-browser' );
var IS_WINDOWS = require( '@stdlib/assert/is-windows' );
var readFileSync = require( '@stdlib/fs/read-file' ).sync;
var CLI_COMMANDS = require( './../bin/cli_commands.json' );


// VARIABLES //

var fpath = resolve( __dirname, '..', 'bin', 'cli' );
var opts = {
	'skip': IS_BROWSER || IS_WINDOWS
};


// FIXTURES //

var PKG_VERSION = require( './../package.json' ).version;


// TESTS //

tape( 'command-line interface', function test( t ) {
	t.ok( true, __filename );
	t.end();
});

tape( 'when invoked with a `--help` flag, the command-line interface prints the help text to `stderr`', opts, function test( t ) {
	var expected;
	var cmd;

	expected = readFileSync( resolve( __dirname, '..', 'bin', 'usage.txt' ), {
		'encoding': 'utf8'
	});
	cmd = [
		process.execPath,
		fpath,
		'--help'
	];

	exec( cmd.join( ' ' ), done );

	function done( error, stdout, stderr ) {
		if ( error ) {
			t.fail( error.message );
		} else {
			t.strictEqual( stdout.toString(), '', 'does not print to `stdout`' );
			t.strictEqual( stderr.toString(), expected+'\n', 'expected value' );
		}
		t.end();
	}
});

tape( 'when invoked with a `-h` flag, the command-line interface prints the help text to `stderr`', opts, function test( t ) {
	var expected;
	var cmd;

	expected = readFileSync( resolve( __dirname, '..', 'bin', 'usage.txt' ), {
		'encoding': 'utf8'
	});
	cmd = [
		process.execPath,
		fpath,
		'-h'
	];

	exec( cmd.join( ' ' ), done );

	function done( error, stdout, stderr ) {
		if ( error ) {
			t.fail( error.message );
		} else {
			t.strictEqual( stdout.toString(), '', 'does not print to `stdout`' );
			t.strictEqual( stderr.toString(), expected+'\n', 'expected value' );
		}
		t.end();
	}
});

tape( 'when invoked with a `--version` flag, the command-line interface prints the version to `stderr`', opts, function test( t ) {
	var cmd = [
		process.execPath,
		fpath,
		'--version'
	];

	exec( cmd.join( ' ' ), done );

	function done( error, stdout, stderr ) {
		if ( error ) {
			t.fail( error.message );
		} else {
			t.strictEqual( stdout.toString(), '', 'does not print to `stdout`' );
			t.strictEqual( stderr.toString(), PKG_VERSION+'\n', 'expected value' );
		}
		t.end();
	}
});

tape( 'when invoked with a `-V` flag, the command-line interface prints the version to `stderr`', opts, function test( t ) {
	var cmd = [
		process.execPath,
		fpath,
		'-V'
	];

	exec( cmd.join( ' ' ), done );

	function done( error, stdout, stderr ) {
		if ( error ) {
			t.fail( error.message );
		} else {
			t.strictEqual( stdout.toString(), '', 'does not print to `stdout`' );
			t.strictEqual( stderr.toString(), PKG_VERSION+'\n', 'expected value' );
		}
		t.end();
	}
});

tape( 'the command-line interface prints the help text for individual commands to `stderr`', opts, function test( t ) {
	var command;
	var idx;

	idx = 0;
	next();

	function next() {
		var cmd;

		command = CLI_COMMANDS[ idx ].command;

		// Handle special case...
		if ( command === 'help [command]' ) {
			command = 'help';
		} else {
			command = 'help '+command;
		}
		cmd = [
			process.execPath,
			fpath,
			command
		];

		exec( cmd.join( ' ' ), done );
	}

	function done( error, stdout, stderr ) {
		if ( error ) {
			t.fail( error.message );
		} else {
			t.strictEqual( stdout.toString(), '', '`'+command+'` does not print to `stdout`' );
			t.strictEqual( stderr.toString().length > 0, true, '`'+command+'` prints to `stderr`' );
		}
		idx += 1;
		if ( idx < CLI_COMMANDS.length ) {
			return next();
		}
		t.end();
	}
});