const importUtil = import("util")


const fileExist = function(file_path) {
    var exist = importUtil.guaFileExist(file_path)
    return exist
}

const linesFromFile = function(path) {
    var content = importUtil.readFile(path)
    var lines = content.split('\n')
    return lines
}

const writeLinesToFile = function(path, lines) {
    var cleanedContent = lines.join('\n')
    cleanedContent.writeToFile(path)
}

const addToPaths = function() {
    var path = '/etc/paths'
    var lines = linesFromFile(path)
    var cleanedLines = []

    var i = 0
    while (i < lines.length()) {
        i += 1
        var index = i - 1
        var line = lines[index]

        if (line.startswith('/usr/local/axe')) {
            continue
        } else if (line.strip() == '') {
            continue
        } else {
            cleanedLines.add(line)
        }
    }
    var axeBin = '/usr/local/axe/bin\n'
    cleanedLines.add(axeBin)
    writeLinesToFile(path, cleanedLines)
}

const shellrcPath = function(shell, user) {
    var rcFile = ''
    if (shell == 'zsh') {
        rcFile = '.zshrc'
    } else if (shell == 'bash') {
        rcFile = '.bashrc'
    } else {
        return null
    }
    var p = '/Users/{}/{}'.format(user, rcFile)
    return p
}

const hasAddShellFunction = function(path) {
    const e = importUtil.guaFileExist(path)
    if (not e) {
        return false
    } else {
        var content = stringFromFile(path)
        return content.has('store.axe')
    }
}

const addShellFunction = function(path, user) {
    // 未知 shell
    if (path == null) {
        return
    }
    const e = importUtil.guaFileExist(path)
    // 文件不存在, 则创建
    if (not e) {
        ''.writeToFile(path)
        const c = 'chown {} {}'.format(user, path)
        importUtil.callWithoutOutput(c)
    }

    var content = stringFromFile(path)

    // 已经写入过
    if (content.has('store.axe')) {
        return
    } else {
        const lines = linesFromFile(path)
        const func = `
# axe init
store.axe()
{
    /usr/local/axe/meta/gualang /usr/local/axe/meta/bin/store.gua "$@"
    hash -r
}
# axe init
`
        const addLines = func.split('\n')
        lines.extend(addLines)
        writeLinesToFile(path, lines)
    }
}

const addToShells = function(user) {
    var pathZsh = shellrcPath('zsh', user)
    var pathBash = shellrcPath('bash', user)
    var e1 = hasAddShellFunction(pathZsh)
    var e2 = hasAddShellFunction(pathBash)
    if (e1 and e2) {
        return false
    }

    var shells = [
        pathZsh,
        pathBash,
    ]

    for (var i = 0; i < shells.length(); i += 1) {
        var path = shells[i]
        addShellFunction(path, user)
    }
    return true
}