'use strict';
const os = require('os');
const hasFlag = require('has-flag');

const env = process.env;

const support = level => {
	if (level === 0) {
		return false;
	}

	return {
		level,
		hasBasic: true,
		has256: level >= 2,
		has16m: level >= 3
	};
};

let supportLevel = (() => {
	if (hasFlag('no-color') ||
		hasFlag('no-colors') ||
		hasFlag('color=false')) {
		return 0;
	}

	if (hasFlag('color=16m') ||
		hasFlag('color=full') ||
		hasFlag('color=truecolor')) {
		return 3;
	}

	if (hasFlag('color=256')) {
		return 2;
	}

	if (hasFlag('color') ||
		hasFlag('colors') ||
		hasFlag('color=true') ||
		hasFlag('color=always')) {
		return 1;
	}

	if (process.stdout && !process.stdout.isTTY) {
		return 0;
	}

	if (process.platform === 'win32') {
		// Node.js 7.5.0 is the first version of Node.js to include a patch to
		// libuv that enables 256 color output on Windows. Anything earlier and it
		// won't work. However, here we target Node.js 8 at minimum as it is an LTS
		// release, and Node.js 7 is not. Windows 10 build 10586 is the first Windows
		// release that supports 256 colors.
		const osRelease = os.release().split('.');
		if (
			Number(process.versions.node.split('.')[0]) >= 8 &&
			Number(osRelease[0]) >= 10 &&
			Number(osRelease[2]) >= 10586
		) {
			return 2;
		}

		return 1;
	}

	if ('CI' in env) {
		if ('TRAVIS' in env || env.CI === 'Travis' || 'CIRCLECI' in env) {
			return 1;
		}

		return 0;
	}

	if ('TEAMCITY_VERSION' in env) {
		return /^(9\.(0*[1-9]\d*)\.|\d{2,}\.)/.test(env.TEAMCITY_VERSION) ? 1 : 0;
	}

	if ('TERM_PROGRAM' in env) {
		const version = parseInt((env.TERM_PROGRAM_VERSION || '').split('.')[0], 10);

		switch (env.TERM_PROGRAM) {
			case 'iTerm.app':
				return version >= 3 ? 3 : 2;
			case 'Hyper':
				return 3;
			case 'Apple_Terminal':
				return 2;
			// No default
		}
	}

	if (/^(screen|xterm)-256(?:color)?/.test(env.TERM)) {
		return 2;
	}

	if (/^screen|^xterm|^vt100|color|ansi|cygwin|linux/i.test(env.TERM)) {
		return 1;
	}

	if ('COLORTERM' in env) {
		return 1;
	}

	if (env.TERM === 'dumb') {
		return 0;
	}

	return 0;
})();

if ('FORCE_COLOR' in env) {
	supportLevel = parseInt(env.FORCE_COLOR, 10) === 0 ? 0 : (supportLevel || 1);
}

module.exports = process && support(supportLevel);
