/**
 * Module dependencies.
 */

var colors = require('colors/safe')
  , utils = require('./utils')
  , repeat = utils.repeat
  , truncate = utils.truncate
  , pad = utils.pad;

/**
 * Table constructor
 *
 * @param {Object} options
 * @api public
 */

function Table (options){
  this.options = utils.options({
      chars: {
          'top': '─'
        , 'top-mid': '┬'
        , 'top-left': '┌'
        , 'top-right': '┐'
        , 'bottom': '─'
        , 'bottom-mid': '┴'
        , 'bottom-left': '└'
        , 'bottom-right': '┘'
        , 'left': '│'
        , 'left-mid': '├'
        , 'mid': '─'
        , 'mid-mid': '┼'
        , 'right': '│'
        , 'right-mid': '┤'
        , 'middle': '│'
      }
    , truncate: '…'
    , colWidths: []
    , colAligns: []
    , style: {
          'padding-left': 1
        , 'padding-right': 1
        , head: ['red']
        , border: ['grey']
        , compact : false
      }
    , head: []
  }, options);
};

/**
 * Inherit from Array.
 */

Table.prototype.__proto__ = Array.prototype;

/**
 * Width getter
 *
 * @return {Number} width
 * @api public
 */

Table.prototype.__defineGetter__('width', function (){
  var str = this.toString().split("\n");
  if (str.length) return str[0].length;
  return 0;
});

/**
 * Render to a string.
 *
 * @return {String} table representation
 * @api public
 */

Table.prototype.render
Table.prototype.toString = function (){
  var ret = ''
    , options = this.options
    , style = options.style
    , head = options.head
    , chars = options.chars
    , truncater = options.truncate
      , colWidths = options.colWidths || new Array(this.head.length)
      , totalWidth = 0;

    if (!head.length && !this.length) return '';

    if (!colWidths.length){
      var all_rows = this.slice(0);
      if (head.length) { all_rows = all_rows.concat([head]) };

      all_rows.forEach(function(cells){
        // horizontal (arrays)
        if (typeof cells === 'object' && cells.length) {
          extractColumnWidths(cells);

        // vertical (objects)
        } else {
          var header_cell = Object.keys(cells)[0]
            , value_cell = cells[header_cell];

          colWidths[0] = Math.max(colWidths[0] || 0, get_width(header_cell) || 0);

          // cross (objects w/ array values)
          if (typeof value_cell === 'object' && value_cell.length) {
            extractColumnWidths(value_cell, 1);
          } else {
            colWidths[1] = Math.max(colWidths[1] || 0, get_width(value_cell) || 0);
          }
        }
    });
  };

  totalWidth = (colWidths.length == 1 ? colWidths[0] : colWidths.reduce(
    function (a, b){
      return a + b
    })) + colWidths.length + 1;

  function extractColumnWidths(arr, offset) {
    var offset = offset || 0;
    arr.forEach(function(cell, i){
      colWidths[i + offset] = Math.max(colWidths[i + offset] || 0, get_width(cell) || 0);
    });
  };

  function get_width(obj) {
    return typeof obj == 'object' && obj.width != undefined
         ? obj.width
         : ((typeof obj == 'object' ? utils.strlen(obj.text) : utils.strlen(obj)) + (style['padding-left'] || 0) + (style['padding-right'] || 0))
  }

  // draws a line
  function line (line, left, right, intersection){
    var width = 0
      , line =
          left
        + repeat(line, totalWidth - 2)
        + right;

    colWidths.forEach(function (w, i){
      if (i == colWidths.length - 1) return;
      width += w + 1;
      line = line.substr(0, width) + intersection + line.substr(width + 1);
    });

    return applyStyles(options.style.border, line);
  };

  // draws the top line
  function lineTop (){
    var l = line(chars.top
               , chars['top-left'] || chars.top
               , chars['top-right'] ||  chars.top
               , chars['top-mid']);
    if (l)
      ret += l + "\n";
  };

  function generateRow (items, style) {
    var cells = []
      , max_height = 0;

    // prepare vertical and cross table data
    if (!Array.isArray(items) && typeof items === "object") {
      var key = Object.keys(items)[0]
        , value = items[key]
        , first_cell_head = true;

      if (Array.isArray(value)) {
        items = value;
        items.unshift(key);
      } else {
        items = [key, value];
      }
    }

    // transform array of item strings into structure of cells
    items.forEach(function (item, i) {
      var contents = item.toString().split("\n").reduce(function (memo, l) {
        memo.push(string(l, i));
        return memo;
      }, [])

      var height = contents.length;
      if (height > max_height) { max_height = height };

      cells.push({ contents: contents , height: height });
    });

    // transform vertical cells into horizontal lines
    var lines = new Array(max_height);
    cells.forEach(function (cell, i) {
      cell.contents.forEach(function (line, j) {
        if (!lines[j]) { lines[j] = [] };
        if (style || (first_cell_head && i === 0 && options.style.head)) {
          line = applyStyles(options.style.head, line)
        }

        lines[j].push(line);
      });

      // populate empty lines in cell
      for (var j = cell.height, l = max_height; j < l; j++) {
        if (!lines[j]) { lines[j] = [] };
        lines[j].push(string('', i));
      }
    });
    var ret = "";
    lines.forEach(function (line, index) {
      if (ret.length > 0) {
        ret += "\n" + applyStyles(options.style.border, chars.left);
      }

      ret += line.join(applyStyles(options.style.border, chars.middle)) + applyStyles(options.style.border, chars.right);
    });

    return applyStyles(options.style.border, chars.left) + ret;
  };

  function applyStyles(styles, subject) {
    if (!subject)
      return '';
    styles.forEach(function(style) {
      subject = colors[style](subject);
    });
    return subject;
  };

  // renders a string, by padding it or truncating it
  function string (str, index){
    var str = String(typeof str == 'object' && str.text ? str.text : str)
      , length = utils.strlen(str)
      , width = colWidths[index]
          - (style['padding-left'] || 0)
          - (style['padding-right'] || 0)
      , align = options.colAligns[index] || 'left';

    return repeat(' ', style['padding-left'] || 0)
         + (length == width ? str :
             (length < width
              ? pad(str, ( width + (str.length - length) ), ' ', align == 'left' ? 'right' :
                  (align == 'middle' ? 'both' : 'left'))
              : (truncater ? truncate(str, width, truncater) : str))
           )
         + repeat(' ', style['padding-right'] || 0);
  };

  if (head.length){
    lineTop();

    ret += generateRow(head, style.head) + "\n"
  }

  if (this.length)
    this.forEach(function (cells, i){
      if (!head.length && i == 0)
        lineTop();
      else {
        if (!style.compact || i<(!!head.length) ?1:0 || cells.length == 0){
          var l = line(chars.mid
                     , chars['left-mid']
                     , chars['right-mid']
                     , chars['mid-mid']);
          if (l)
            ret += l + "\n"
        }
      }

      if (cells.hasOwnProperty("length") && !cells.length) {
        return
      } else {
        ret += generateRow(cells) + "\n";
      };
    });

  var l = line(chars.bottom
             , chars['bottom-left'] || chars.bottom
             , chars['bottom-right'] || chars.bottom
             , chars['bottom-mid']);
  if (l)
    ret += l;
  else
    // trim the last '\n' if we didn't add the bottom decoration
    ret = ret.slice(0, -1);

  return ret;
};

/**
 * Module exports.
 */

module.exports = Table;

module.exports.version = '0.0.1';