const fs = require("fs");
const path = require("path");

class AutoIndentErr extends Error {
    constructor(message) {
        super(message);
    }
}

function ForceObjectType(type, object, paramName) {
    if (typeof object === type) {

    } else {
        throw new AutoIndentErr("The parameter (" + paramName + ") you returned wasn't a " + type + "!")
    }
}

function CheckSettings(Settings) {
    if (typeof Settings === "object") {

    } else {
        throw new AutoIndentErr("The settings you returned are not an Object!")
    }

    if (Settings.IndentLength == undefined) {
        throw new AutoIndentErr("IndentLength in your Settings is not defined!")
    } else {
        if (typeof Settings.IndentLength == "number") {

        } else {
            throw new AutoIndentErr("IndentLength is not a number!")
        }
    }

    if (Settings.ReplaceIndents == undefined) {
        throw new AutoIndentErr("ReplaceIndents in your Settings is not defined!")
    } else {
        if (typeof Settings.ReplaceIndents == "boolean") {

        } else {
            throw new AutoIndentErr("ReplaceIndents is not a boolean!")
        }
    }
}

/**
 * Logs the indented string to the console. (LEGACY)
 * 
 * @since 2.2.0
 * 
 * @param {number} indent - The amonut of indent (in spaces) 
 * @param {string} string - The string you want to indent 
 * @returns {void} - Doesn't return string, 
 * 
 * @example
 * lstdout(2, "Hello, World!"); // Output: "  Hello, World!"
 */
const lstdout = (indent = 2, string) => {
    ForceObjectType("number", indent, "indent");
    ForceObjectType("string", string, "string");

    const msg = `${" ".repeat(indent)}${string}`
    console.log(msg)
}

/**
 * Returns indented string. (LEGACY)
 * 
 * @since 2.2.0
 * 
 * @param {number} indent - The amonut of indent (in spaces) 
 * @param {string} string - The string you want to indent 
 * @returns {string} - The indented string.
 * 
 * @example
 * lireturn(2, "Hello, World!"); // Output: "  Hello, World!"
 */
const lireturn = (indent = 2, string) => {
    ForceObjectType("number", indent, "indent");
    ForceObjectType("string", string, "string");

    const msg = `${" ".repeat(indent)}${string}`
    return msg;
}

/**
* Logs the indented string to the console.
*
* @since 1.0.0
* 
* @param {string} string - The string to log.
* @param {Object} Settings - Your settings object.
* @returns {void} - Doesn't need to return anything.
* 
* @example
* const Settings = loadSettings() // { "IndentLength": 2, "ReplaceIndents": false}
*
* stdout("Hello, World!"); // Output: "  Hello, World!"
*/
const stdout = (string, Settings = { "IndentLength": 2, "ReplaceIndents": false }) => {

    // ^^^ Recommended settings in the Settings parameter.

    ForceObjectType("string", string, "string")
    CheckSettings(Settings);

    const msg = `${" ".repeat(Settings.IndentLength)}${string}`;
    console.log(msg);
};

/**
* Returns the indented string instead of logging.
*
* @since 1.0.0
* 
* @param {string} string - The string to return.
* @param {object} Settings - Your settings
* @returns {string} - The indented string.
* 
* @example
* const Settings = loadSettings() // { "IndentLength": 2, "ReplaceIndents": false}
*
* console.log(ireturn("Hello, World!", Settings)); // Output: "  Hello, World!"
*/
const ireturn = (string = "", Settings = { "IndentLength": 2, "ReplaceIndents": false }) => {

    // ^^^ Recommended settings in the parameter 

    CheckSettings(Settings);
    
    const msg = `${" ".repeat(Settings.IndentLength)}${string}`;
    return msg;
};

/**
* Loads your indent-settings.json and validates them. If they are not valid, returns error.
*
* @since 2.0.0
* 
* @param {string} Path - The path to your indent-settings.json. Only required if it's not in the root of your project.
* @returns {Object} - The loadSettings() function returns your settings in JSON, this is how different Settings objects are cross compatible.
* @example
* const Settings = loadSettings() // Easy as that!
*/
const loadSettings = (Path = "indent-settings.json") => {

    const UserProjectPath = path.dirname(require.main.filename).replace(/\\/g, "/");
    const UserSettings = JSON.parse(fs.readFileSync(UserProjectPath + "/" + Path));

    return UserSettings;
};

module.exports = {
    stdout,
    lstdout,
    ireturn,
    lireturn,
    loadSettings
};