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#!powershell
# This file is part of Ansible
#
# Copyright 2015, Phil Schwartz <schwartzmx@gmail.com>
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

# WANT_JSON
# POWERSHELL_COMMON

$result = @{
    changed = $false
    win_timezone = @{}
}

$params = Parse-Args $args -supports_check_mode $true
$check_mode = Get-AnsibleParam -obj $params -name "_ansible_check_mode" -type "bool" -default $false

$timezone = Get-AnsibleParam -obj $params -name "timezone" -failifempty $true -resultobj $result

Try {
    # Get the current timezone set
    $currentTZ = $(tzutil.exe /g)
    If ($LASTEXITCODE -ne 0) {
        Throw "An error occurred when getting the current machine's timezone setting."
    }

    If ( $currentTZ -eq $timezone ) {
        Exit-Json $result "$timezone is already set on this machine"
    } Else {
        $tzExists = $false
        #Check that timezone can even be set (if it is listed from tzutil as an available timezone to the machine)
        $tzList = $(tzutil.exe /l)
        If ($LASTEXITCODE -ne 0) {
            Throw "An error occurred when listing the available timezones."
        }
        ForEach ($tz in $tzList) {
            If ( $tz -eq $timezone ) {
                $tzExists = $true
                break
            }
        }

        If ( $tzExists ) {
            if (-not $check_mode) {
                tzutil.exe /s "$timezone"
                If ($LASTEXITCODE -ne 0) {
                    Throw "An error occurred when setting the specified timezone with tzutil."
                }
                $newTZ = $(tzutil.exe /g)
                If ($LASTEXITCODE -ne 0) {
                    Throw "An error occurred when getting the current machine's timezone setting."
                }

                If ( $timezone -eq $newTZ ) {
                    $result.changed = $true
                }
            } else {
                $result.changed = $true
            }
        } Else {
            Fail-Json $result "The specified timezone: $timezone isn't supported on the machine."
        }
    }
} Catch {
    Fail-Json $result "Error setting timezone to: $timezone."
}

Exit-Json $result