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'use strict';
 
import fs from 'fs';
import path from 'path';
 
import {
    get as lodashGet,
    set as lodashSet
} from 'lodash';
 
import {
    weakToJSON,
    guessUpcast
} from './utils';
 
class Cz {
    constructor(options) {
        this._config = new WeakMap();
        this._defaults = new WeakMap();
        this._path = null;
        this._options = new WeakMap();
 
        if (options) {
            Eif ('upcast' in options) {
                this._options.upcast = options.upcast;
            }
        }
    }
 
    get(prop) {
        const wholeObj = Object.assign(weakToJSON(this._defaults), weakToJSON(this._config));
        if (arguments.length === 0) {
            return wholeObj;
        }
        return lodashGet(wholeObj, prop.replace(':', '.'));
    }
 
    set(prop, value) {
        // Handles if prop is key or obj
        if (value === undefined) {
            for (const key of Object.keys(prop)) {
                Iif ('upcast' in this._options && this._options.upcast === true) {
                    lodashSet(this._config, key, guessUpcast(prop[key]));
                } else {
                    lodashSet(this._config, key, prop[key]);
                }
            }
        } else if ('upcast' in this._options && this._options.upcast === true) {
            lodashSet(this._config, prop.replace(':', '.'), guessUpcast(value));
        } else {
            lodashSet(this._config, prop.replace(':', '.'), value);
        }
    }
 
    defaults(obj) {
        this._defaults = obj;
    }
 
    load(newPath) {
        const file = fs.readFileSync(newPath, 'utf-8');
        this._path = newPath;
        // We use 2 as an empty file with a new line would return 1
        if (file.length >= 2) {
            const data = JSON.parse(file);
            for (const prop of Object.keys(data)) {
                this._config[prop] = data[prop];
            }
        }
    }
 
    save(newPath) {
        if (arguments.length === 0 && this._path === null) {
            throw new Error('No path provided.');
        } else {
            fs.writeFileSync(path.normalize(newPath || this._path), JSON.stringify(this._config, null, 4) + '\n', 'utf8');
        }
    }
 
    args(options = {}) {
        const args = process.argv.filter(arg => {
            return arg.startsWith('--') && arg.includes('=');
        });
        args.forEach(arg => {
            arg = arg.slice(2).split('='); // Gets us ['db:host', 'localhost'] from '--db:host=localhost'
            Iif ('upcast' in options && options.upcast === true) {
                this.set(arg[0], guessUpcast(arg[1]));
            } else {
                this.set(arg[0], arg[1]);
            }
        });
    }
 
    env(options = {}) {
        let envs = {};
        Iif (options.caseInsensative) {
            Object.keys(process.env).forEach(key => {
                if (process.env[key.toLowerCase()]) {
                    if (process.env[key.toLowerCase()] === process.env[key]) {
                        envs[key.toLowerCase()] = process.env[key];
                    } else {
                        envs[key] = process.env[key];
                    }
                } else {
                    envs[key.toLowerCase()] = process.env[key];
                }
            });
        } else {
            envs = process.env;
        }
        Object.keys(envs).forEach(key => {
            if (options.allowed) {
                key = key.replace(options.seperator || '__', ':');
                if (options.allowed.includes(key.split(':')[0])) {
                    if ('upcast' in options && options.upcast === true) {
                        this.set(key, guessUpcast(envs[key]));
                    } else {
                        this.set(key, envs[key]);
                    }
                }
            } else {
                key = key.replace(options.seperator || '__', ':');
                Iif ('upcast' in options && options.upcast === true) {
                    this.set(key, guessUpcast(envs[key]));
                } else {
                    this.set(key, envs[key]);
                }
            }
        });
    }
 
    joinGets(gets, joins) {
        // @TODO: Add support for a single join param instead of just array
        const results = gets.map(get => {
            return this.get(get);
        });
        let finalResult = '';
        for (let i = 0; i < gets.length; i++) {
            finalResult += results[i];
            if (i + 1 !== gets.length) {
                finalResult += joins[i];
            }
        }
        return finalResult;
    }
 
    reset() {
        this._config = new WeakMap();
    }
}
 
export default Cz;