var colors = require('colors')
var util = require('util')
var pathUtils = require('path')

var PATH_SEP = pathUtils.sep

// Prints dir compare results.
// 'program' represents display options and correspond to dircompare command line parameters.
// Example: 'dircompare --show-all --exclude *.js dir1 dir2' translates into
// program: {showAll: true, exclude: '*.js'}
//
var print = function (res, writer, program) {
    var noColor = function (str) { return str }
    var colorEqual = program.nocolors ? noColor : colors.green
    var colorDistinct = program.nocolors ? noColor : colors.red
    var colorLeft = noColor
    var colorRight = noColor
    var colorDir = noColor
    var colorBrokenLinks = noColor
    var colorMissing = program.nocolors ? noColor : colors.yellow

    // calculate relative path length for pretty print
    var relativePathMaxLength = 0, fileNameMaxLength = 0
    if (!program.csv && res.diffSet) {
        res.diffSet.forEach(function (diff) {
            if (diff.relativePath.length > relativePathMaxLength) {
                relativePathMaxLength = diff.relativePath.length
            }
            var len = getCompareFile(diff, '??', colorMissing).length
            if (len > fileNameMaxLength) {
                fileNameMaxLength = len
            }
        })
    }

    // csv header
    if (program.csv) {
        writer.write('path,name,state,type,size1,size2,date1,date2,reason\n')
    }
    if (res.diffSet) {
        for (var i = 0; i < res.diffSet.length; i++) {
            var detail = res.diffSet[i]
            var color, show = true

            if (!program.wholeReport) {
                // show only files or broken links
                var type = detail.type1 !== 'missing' ? detail.type1 : detail.type2
                if (type !== 'file' && type !== 'broken-link') {
                    show = false
                }
            }
            if (show) {
                switch (detail.state) {
                    case 'equal':
                        color = colorEqual
                        show = program.showAll || program.showEqual ? true : false
                        break
                    case 'left':
                        color = colorLeft
                        show = program.showAll || program.showLeft ? true : false
                        break
                    case 'right':
                        color = colorRight
                        show = program.showAll || program.showRight ? true : false
                        break
                    case 'distinct':
                        color = colorDistinct
                        show = program.showAll || program.showDistinct ? true : false
                        break
                    default:
                        show = true
                        color = colors.gray
                }
                if (show) {
                    if (program.csv) {
                        printCsv(writer, detail, color)
                    } else {
                        printPretty(writer, program, detail, color, colorDir, colorMissing, relativePathMaxLength, fileNameMaxLength)
                    }
                }
            }
        }
    }

    // PRINT STATISTICS
    var statTotal, statEqual, statLeft, statRight, statDistinct
    if (program.wholeReport) {
        statTotal = res.total
        statEqual = res.equal
        statLeft = res.left
        statRight = res.right
        statDistinct = res.distinct
    } else {
        var brokenLInksStats = res.brokenLinks
        statTotal = res.totalFiles + brokenLInksStats.totalBrokenLinks
        statEqual = res.equalFiles
        statLeft = res.leftFiles + brokenLInksStats.leftBrokenLinks
        statRight = res.rightFiles + brokenLInksStats.rightBrokenLinks
        statDistinct = res.distinctFiles + brokenLInksStats.distinctBrokenLinks
    }
    if (!program.noDiffIndicator) {
        writer.write(res.same ? colorEqual('Entries are identical\n') : colorDistinct('Entries are different\n'))
    }
    var stats = util.format('total: %s, equal: %s, distinct: %s, only left: %s, only right: %s',
        statTotal,
        colorEqual(statEqual),
        colorDistinct(statDistinct),
        colorLeft(statLeft),
        colorRight(statRight)
    )
    if (res.brokenLinks.totalBrokenLinks > 0) {
        stats += util.format(', broken links: %s', colorBrokenLinks(res.brokenLinks.totalBrokenLinks))
    }
    stats += '\n'
    writer.write(stats)
}

/**
 * Print details for default view mode
 */
var printPretty = function (writer, program, detail, color, dirColor, missingColor, relativePathMaxLength, fileNameMaxLength) {
    var path = detail.relativePath === '' ? PATH_SEP : detail.relativePath

    var state
    switch (detail.state) {
        case 'equal':
            state = '=='
            break
        case 'left':
            state = '->'
            break
        case 'right':
            state = '<-'
            break
        case 'distinct':
            state = '<>'
            break
        default:
            state = '?'
    }
    var type = ''
    type = detail.type1 !== 'missing' ? detail.type1 : detail.type2
    if (type === 'directory') {
        type = dirColor(type)
    }
    var cmpEntry = getCompareFile(detail, color(state), missingColor)
    var reason = ''
    if (program.reason && detail.reason) {
        reason = util.format(' <%s>', detail.reason)
    }
    if (program.wholeReport || type === 'broken-link') {
        writer.write(util.format('[%s] %s (%s)%s\n', path, cmpEntry, type, reason))
    } else {
        writer.write(util.format('[%s] %s%s\n', path, cmpEntry, reason))
    }
}

var getCompareFile = function (detail, state, missingcolor) {
    p1 = detail.name1 ? detail.name1 : ''
    p2 = detail.name2 ? detail.name2 : ''
    var missing1 = detail.type1 === 'missing' ? missingcolor('missing') : ''
    var missing2 = detail.type2 === 'missing' ? missingcolor('missing') : ''
    return util.format('%s%s %s %s%s', missing1, p1, state, missing2, p2)
}

/**
 * Print csv details.
 */
var printCsv = function (writer, detail, color) {
    var size1 = '', size2 = ''
    if (detail.type1 === 'file') {
        size1 = detail.size1 !== undefined ? detail.size1 : ''
    }
    if (detail.type2 === 'file') {
        size2 = detail.size2 !== undefined ? detail.size2 : ''
    }

    var date1 = '', date2 = ''
    date1 = detail.date1 !== undefined ? detail.date1.toISOString() : ''
    date2 = detail.date2 !== undefined ? detail.date2.toISOString() : ''

    var type = ''
    type = detail.type1 !== 'missing' ? detail.type1 : detail.type2

    var path = detail.relativePath ? detail.relativePath : PATH_SEP
    var name = (detail.name1 ? detail.name1 : detail.name2)
    var reason = detail.reason || ''

    writer.write(util.format('%s,%s,%s,%s,%s,%s,%s,%s,%s\n', path, name, color(detail.state), type, size1, size2, date1, date2, reason))
}

module.exports = print