'use strict'

// (The MIT License)
//
// Copyright (c) 2014 Titus Wormer <tituswormer@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// 'Software'), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

/* Expose. */
module.exports = markdownTable

/* Expressions. */
var EXPRESSION_DOT = /\./
var EXPRESSION_LAST_DOT = /\.[^.]*$/

/* Allowed alignment values. */
var LEFT = 'l'
var RIGHT = 'r'
var CENTER = 'c'
var DOT = '.'
var NULL = ''

var ALLIGNMENT = [LEFT, RIGHT, CENTER, DOT, NULL]
var MIN_CELL_SIZE = 3

/* Characters. */
var COLON = ':'
var DASH = '-'
var PIPE = '|'
var SPACE = ' '
var NEW_LINE = '\n'

/* Create a table from a matrix of strings. */
function markdownTable(table, options) {
    var settings = options || {}
    var delimiter = settings.delimiter
    var start = settings.start
    var end = settings.end
    var alignment = settings.align
    var calculateStringLength = settings.stringLength || lengthNoop
    var cellCount = 0
    var rowIndex = -1
    var rowLength = table.length
    var sizes = []
    var align
    var rule
    var rows
    var row
    var cells
    var index
    var position
    var size
    var value
    var spacing
    var before
    var after

    alignment = alignment ? alignment.concat() : []

    if (delimiter === null || delimiter === undefined) {
        delimiter = SPACE + PIPE + SPACE
    }

    if (start === null || start === undefined) {
        start = PIPE + SPACE
    }

    if (end === null || end === undefined) {
        end = SPACE + PIPE
    }

    while (++rowIndex < rowLength) {
        row = table[rowIndex]

        index = -1

        if (row.length > cellCount) {
            cellCount = row.length
        }

        while (++index < cellCount) {
            position = row[index] ? dotindex(row[index]) : null

            if (!sizes[index]) {
                sizes[index] = MIN_CELL_SIZE
            }

            if (position > sizes[index]) {
                sizes[index] = position
            }
        }
    }

    if (typeof alignment === 'string') {
        alignment = pad(cellCount, alignment).split('')
    }

    /* Make sure only valid alignments are used. */
    index = -1

    while (++index < cellCount) {
        align = alignment[index]

        if (typeof align === 'string') {
            align = align.charAt(0).toLowerCase()
        }

        if (ALLIGNMENT.indexOf(align) === -1) {
            align = NULL
        }

        alignment[index] = align
    }

    rowIndex = -1
    rows = []

    while (++rowIndex < rowLength) {
        row = table[rowIndex]

        index = -1
        cells = []

        while (++index < cellCount) {
            value = row[index]

            value = stringify(value)

            if (alignment[index] === DOT) {
                position = dotindex(value)

                size =
                    sizes[index] +
                    (EXPRESSION_DOT.test(value) ? 0 : 1) -
                    (calculateStringLength(value) - position)

                cells[index] = value + pad(size - 1)
            } else {
                cells[index] = value
            }
        }

        rows[rowIndex] = cells
    }

    sizes = []
    rowIndex = -1

    while (++rowIndex < rowLength) {
        cells = rows[rowIndex]

        index = -1

        while (++index < cellCount) {
            value = cells[index]

            if (!sizes[index]) {
                sizes[index] = MIN_CELL_SIZE
            }

            size = calculateStringLength(value)

            if (size > sizes[index]) {
                sizes[index] = size
            }
        }
    }

    rowIndex = -1

    while (++rowIndex < rowLength) {
        cells = rows[rowIndex]

        index = -1

        if (settings.pad !== false) {
            while (++index < cellCount) {
                value = cells[index]

                position = sizes[index] - (calculateStringLength(value) || 0)
                spacing = pad(position)

                if (alignment[index] === RIGHT || alignment[index] === DOT) {
                    value = spacing + value
                } else if (alignment[index] === CENTER) {
                    position /= 2

                    if (position % 1 === 0) {
                        before = position
                        after = position
                    } else {
                        before = position + 0.5
                        after = position - 0.5
                    }

                    value = pad(before) + value + pad(after)
                } else {
                    value += spacing
                }

                cells[index] = value
            }
        }

        rows[rowIndex] = cells.join(delimiter)
    }

    if (settings.rule !== false) {
        index = -1
        rule = []

        while (++index < cellCount) {
            /* When `pad` is false, make the rule the same size as the first row. */
            if (settings.pad === false) {
                value = table[0][index]
                spacing = calculateStringLength(stringify(value))
                spacing = spacing > MIN_CELL_SIZE ? spacing : MIN_CELL_SIZE
            } else {
                spacing = sizes[index]
            }

            align = alignment[index]

            /* When `align` is left, don't add colons. */
            value = align === RIGHT || align === NULL ? DASH : COLON
            value += pad(spacing - 2, DASH)
            value += align !== LEFT && align !== NULL ? COLON : DASH

            rule[index] = value
        }

        rows.splice(1, 0, rule.join(delimiter))
    }

    return start + rows.join(end + NEW_LINE + start) + end
}

function stringify(value) {
    return value === null || value === undefined ? '' : String(value)
}

/* Get the length of `value`. */
function lengthNoop(value) {
    return String(value).length
}

/* Get a string consisting of `length` `character`s. */
function pad(length, character) {
    return new Array(length + 1).join(character || SPACE)
}

/* Get the position of the last dot in `value`. */
function dotindex(value) {
    var match = EXPRESSION_LAST_DOT.exec(value)

    return match ? match.index + 1 : value.length
}