#!/usr/bin/env node
/**
 * Copyright (c) 2015 Joyent Inc. All rights reserved.
 */

var assert = require('assert-plus');
var format = require('util').format;
var fs = require('fs');
var path = require('path');

var common = require('./common');
var errors = require('./errors');


var DEFAULT_USER_CONFIG_PATH = path.resolve(process.env.HOME,
        '.triton', 'config.json');
var DEFAULTS_PATH = path.resolve(__dirname, '..', 'etc', 'defaults.json');
var OVERRIDE_KEYS = []; // config object keys to do a one-level deep override



/**
 * Load the Triton client config. This is a merge of the built-in "defaults" (at
 * etc/defaults.json) and the "user" config (at ~/.triton/config.json if it
 * exists).
 *
 * This includes some internal data on keys with a leading underscore.
 */
function loadConfigSync(opts) {
    assert.object(opts, 'opts');
    assert.string(opts.configPath, 'opts.configPath');
    assert.optionalObject(opts.envProfile, 'opts.envProfile');

    var c = fs.readFileSync(DEFAULTS_PATH, 'utf8');
    var _defaults = JSON.parse(c);
    var config = JSON.parse(c);
    if (opts.configPath && fs.existsSync(opts.configPath)) {
        c = fs.readFileSync(opts.configPath, 'utf8');
        var _user = JSON.parse(c);
        var userConfig = JSON.parse(c);
        if (typeof (userConfig) !== 'object' || Array.isArray(userConfig)) {
            throw new errors.ConfigError(
                format('"%s" is not an object', opts.configPath));
        }
        // These special keys are merged into the key of the same name in the
        // base "defaults.json".
        Object.keys(userConfig).forEach(function (key) {
            if (~OVERRIDE_KEYS.indexOf(key) && config[key] !== undefined) {
                Object.keys(userConfig[key]).forEach(function (subKey) {
                    if (userConfig[key][subKey] === null) {
                        delete config[key][subKey];
                    } else {
                        config[key][subKey] = userConfig[key][subKey];
                    }
                });
            } else {
                config[key] = userConfig[key];
            }
        });

        config._user = _user;
    }
    config._defaults = _defaults;

    // Add 'env' profile, if given.
    if (opts.envProfile) {
        if (!config.profiles) {
            config.profiles = [];
        }
        config.profiles.push(opts.envProfile);
    }

    return config;
}



//---- exports

module.exports = {
    DEFAULT_USER_CONFIG_PATH: DEFAULT_USER_CONFIG_PATH,
    loadConfigSync: loadConfigSync
};
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