/**
 * @author Mark Jones [github.com/justanothermark]
 * @copyright Crown Copyright 2018
 * @license Apache-2.0
 */

import Operation from "../Operation";
import Utils from "../Utils";

/**
 * To Table operation
 */
class ToTable extends Operation {

    /**
     * ToTable constructor
     */
    constructor() {
        super();

        this.name = "To Table";
        this.module = "Default";
        this.description = "Data can be split on different characters and rendered as an HTML or ASCII table with an optional header row.<br><br>Supports the CSV (Comma Separated Values) file format by default. Change the cell delimiter argument to <code>\\t</code> to support TSV (Tab Separated Values) or <code>|</code> for PSV (Pipe Separated Values).<br><br>You can enter as many delimiters as you like. Each character will be treat as a separate possible delimiter.";
        this.inputType = "string";
        this.outputType = "html";
        this.args = [
            {
                "name": "Cell delimiters",
                "type": "binaryShortString",
                "value": ","
            },
            {
                "name": "Row delimiters",
                "type": "binaryShortString",
                "value": "\\n\\r"
            },
            {
                "name": "Make first row header",
                "type": "boolean",
                "value": false
            },
            {
                "name": "Format",
                "type": "option",
                "value": ["ASCII", "HTML"]
            }
        ];
    }

    /**
     * @param {string} input
     * @param {Object[]} args
     * @returns {html}
     */
    run(input, args) {
        const [cellDelims, rowDelims, firstRowHeader, format] = args;

        // Process the input into a nested array of elements.
        const tableData = Utils.parseCSV(input, cellDelims.split(""), rowDelims.split(""));

        if (!tableData.length) return "";

        // Render the data in the requested format.
        switch (format) {
            case "ASCII":
                return asciiOutput(tableData);
            case "HTML":
            default:
                return htmlOutput(tableData);
        }

        /**
         * Outputs an array of data as an ASCII table.
         *
         * @param {string[][]} tableData
         * @returns {string}
         */
        function asciiOutput(tableData) {
            const horizontalBorder = "-";
            const verticalBorder = "|";
            const crossBorder = "+";

            let output = "";
            const longestCells = [];

            // Find longestCells value per column to pad cells equally.
            tableData.forEach(function(row, index) {
                row.forEach(function(cell, cellIndex) {
                    if (longestCells[cellIndex] === undefined || cell.length > longestCells[cellIndex]) {
                        longestCells[cellIndex] = cell.length;
                    }
                });
            });

            // Add the top border of the table to the output.
            output += outputHorizontalBorder(longestCells);

            // If the first row is a header, remove the row from the data and
            // add it to the output with another horizontal border.
            if (firstRowHeader) {
                const row = tableData.shift();
                output += outputRow(row, longestCells);
                output += outputHorizontalBorder(longestCells);
            }

            // Add the rest of the table rows.
            tableData.forEach(function(row, index) {
                output += outputRow(row, longestCells);
            });

            // Close the table with a final horizontal border.
            output += outputHorizontalBorder(longestCells);

            return output;

            /**
             * Outputs a row of correctly padded cells.
             */
            function outputRow(row, longestCells) {
                let rowOutput = verticalBorder;
                row.forEach(function(cell, index) {
                    rowOutput += " " + cell + " ".repeat(longestCells[index] - cell.length) + " " + verticalBorder;
                });
                rowOutput += "\n";
                return rowOutput;
            }

            /**
             * Outputs a horizontal border with a different character where
             * the horizontal border meets a vertical border.
             */
            function outputHorizontalBorder(longestCells) {
                let rowOutput = crossBorder;
                longestCells.forEach(function(cellLength) {
                    rowOutput += horizontalBorder.repeat(cellLength + 2) + crossBorder;
                });
                rowOutput += "\n";
                return rowOutput;
            }
        }

        /**
         * Outputs a table of data as a HTML table.
         *
         * @param {string[][]} tableData
         * @returns {string}
         */
        function htmlOutput(tableData) {
            // Start the HTML output with suitable classes for styling.
            let output = "<table class='table table-hover table-sm table-bordered table-nonfluid'>";

            // If the first row is a header then put it in <thead> with <th> cells.
            if (firstRowHeader) {
                const row = tableData.shift();
                output += "<thead class='thead-light'>";
                output += outputRow(row, "th");
                output += "</thead>";
            }

            // Output the rest of the rows in the <tbody>.
            output += "<tbody>";
            tableData.forEach(function(row, index) {
                output += outputRow(row, "td");
            });

            // Close the body and table elements.
            output += "</tbody></table>";
            return output;

          /**
           * Outputs a table row.
           *
           * @param {string[]} row
           * @param {string} cellType
           */
            function outputRow(row, cellType) {
                let output = "<tr>";
                row.forEach(function(cell) {
                    output += "<" + cellType + ">" + cell + "</" + cellType + ">";
                });
                output += "</tr>";
                return output;
            }
        }
    }

}

export default ToTable;