// Type definitions for easy-table
// Definitions by: Niklas Mollenhauer <https://github.com/nikeee>

declare class EasyTable {

    /**
     * String to separate columns
     */
    public separator: string;

    /**
     * Default printer
     */
    public static string(value: any): string;

    /**
     * Create a printer which right aligns the content by padding with `ch` on the left
     *
     * @param {String} ch
     * @returns {Function}
     */
    public static leftPadder<T>(ch: string): CellPrinter<T>;

    public static padLeft: CellPrinter<string>;

    /**
     * Create a printer which pads with `ch` on the right
     *
     * @param {String} ch
     * @returns {Function}
     */
    public static rightPadder<T>(ch: string): CellPrinter<T>;

    // public static padRight: CellPrinter<string>;

    /**
     * Create a printer for numbers
     *
     * Will do right alignment and optionally fix the number of digits after decimal point
     *
     * @param {Number} [digits] - Number of digits for fixpoint notation
     * @returns {Function}
     */
    public static number(digits?: number): CellPrinter<number>;

    public constructor();

    /**
     * Push the current row to the table and start a new one
     *
     * @returns {Table} `this`
     */
    public newRow(): this;

    /**
     * Write cell in the current row
     *
     * @param {String} col          - Column name
     * @param {Any} val             - Cell value
     * @param {Function} [printer]  - Printer function to format the value
     * @returns {Table} `this`
     */
    public cell<T>(col: string, val: T, printer?: CellPrinter<T>): this;

    /**
     * Get list of columns in printing order
     *
     * @returns {string[]}
     */
    public columns(): string[];

    /**
     * Format just rows, i.e. print the table without headers and totals
     *
     * @returns {String} String representaion of the table
     */
    public print(): string;

    /**
     * Format the table
     *
     * @returns {String}
     */
    public toString(): string;

    /**
     * Push delimeter row to the table (with each cell filled with dashs during printing)
     *
     * @param {String[]} [cols]
     * @returns {Table} `this`
     */
    public pushDelimeter(cols?: ReadonlyArray<string>): this;

    /**
     * Compute all totals and yield the results to `cb`
     *
     * @param {Function} cb - Callback function with signature `(column, value, printer)`
     */
    public forEachTotal<T>(cb: (column: string, value: T, printer: CellPrinter<T>) => void): void;

    /**
     * Format the table so that each row represents column and each column represents row
     *
     * @param {IPrintColumnOptions} [opts]
     * @returns {String}
     */
    public printTransposed<T>(opts?: PrintColumnOptions<T>): string;

    /**
     * Sort the table
     *
     * @param {Function|string[]} [cmp] - Either compare function or a list of columns to sort on
     * @returns {Table} `this`
     */
    public sort(cmp?: ReadonlyArray<string>): this;
    /**
     * Sort the table
     *
     * @param {Function|string[]} [cmp] - Either compare function or a list of columns to sort on
     * @returns {Table} `this`
     */
    public sort<T>(cmp?: CompareFunction<T>): this;

    /**
     * Add a total for the column
     *
     * @param {String} col - column name
     * @param {Object} [opts]
     * @returns {Table} `this`
     */
    public total<T>(col: string, opts?: TotalOptions<T>): this;
    /**
     * Predefined helpers for totals
     */
    public static aggr: Aggregators;

    /**
     * Print the array or object
     *
     * @param {Array|Object} obj - Object to print
     * @param {Function|Object} [format] - Format options
     * @param {Function} [cb] - Table post processing and formating
     * @returns {String}
     */
    public static print<T>(obj: T | T[], format?: FormatFunction<T> | FormatObject, cb?: TablePostProcessing): string;

    /**
     * Same as `Table.print()` but yields the result to `console.log()`
     */
    public static log<T>(obj: T | T[], format?: FormatFunction<T> | FormatObject, cb?: TablePostProcessing): void;
    /**
     * Same as `.toString()` but yields the result to `console.log()`
     */
    public log(): void;
}

type CellPrinter<T> = (val: T, width: number) => string;
type CompareFunction<T> = (a: T, b: T) => number;
type ReduceFunction<T> = (acc: T, val: T, idx: number, length: number) => T;
type FormatFunction<T> = (obj: T, cell: (name: string, val: any) => void) => void;
type TablePostProcessing = (result: EasyTable) => string;

interface PrintColumnOptions<T> {
    /**
     * Column separation string
     */
    separator?: string | undefined;
    /**
     * Printer to format column names
     */
    namePrinter?: CellPrinter<T> | undefined;
}

interface Aggregators {
    /**
     * Create a printer which formats the value with `printer`,
     * adds the `prefix` to it and right aligns the whole thing
     *
     * @param {String} prefix
     * @param {Function} printer
     * @returns {printer}
     */
    printer<T>(prefix: string, printer: CellPrinter<T>): CellPrinter<T>;
    /**
     * Sum reduction
     */
    sum: any;
    /**
     * Average reduction
     */
    avg: any;
}

interface TotalOptions<T> {
    /**
     * reduce(acc, val, idx, length) function to compute the total value
     */
    reduce?: ReduceFunction<T> | undefined;
    /**
     * Printer to format the total cell
     */
    printer?: CellPrinter<T> | undefined;
    /**
     * Initial value for reduction
     */
    init?: T | undefined;
}

interface FormatObject {
    [key: string]: ColumnFormat<any>;
}

interface ColumnFormat<T> {
    name?: string | undefined;
    printer?: CellPrinter<T> | undefined
}

export = EasyTable;