#!powershell

# Copyright (c) 2017 Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

#Requires -Module Ansible.ModuleUtils.CamelConversion
#Requires -Module Ansible.ModuleUtils.Legacy
#Requires -Module Ansible.ModuleUtils.SID

$params = Parse-Args -arguments $args
$path = Get-AnsibleParam -obj $params -name "path" -type "str" -default "\"
$name = Get-AnsibleParam -obj $params -name "name" -type "str"

$result = @{
    changed = $false
}

Add-Type -TypeDefinition @"
public enum TASK_ACTION_TYPE
{
    TASK_ACTION_EXEC          = 0,
    // The below are not supported and are only kept for documentation purposes
    TASK_ACTION_COM_HANDLER   = 5,
    TASK_ACTION_SEND_EMAIL    = 6,
    TASK_ACTION_SHOW_MESSAGE  = 7
}

public enum TASK_LOGON_TYPE
{
    TASK_LOGON_NONE                           = 0,
    TASK_LOGON_PASSWORD                       = 1,
    TASK_LOGON_S4U                            = 2,
    TASK_LOGON_INTERACTIVE_TOKEN              = 3,
    TASK_LOGON_GROUP                          = 4,
    TASK_LOGON_SERVICE_ACCOUNT                = 5,
    TASK_LOGON_INTERACTIVE_TOKEN_OR_PASSWORD  = 6
}

public enum TASK_RUN_LEVEL
{
    TASK_RUNLEVEL_LUA      = 0,
    TASK_RUNLEVEL_HIGHEST  = 1
}

public enum TASK_STATE
{
    TASK_STATE_UNKNOWN   = 0,
    TASK_STATE_DISABLED  = 1,
    TASK_STATE_QUEUED    = 2,
    TASK_STATE_READY     = 3,
    TASK_STATE_RUNNING   = 4
}

public enum TASK_TRIGGER_TYPE2
{
    TASK_TRIGGER_EVENT                 = 0,
    TASK_TRIGGER_TIME                  = 1,
    TASK_TRIGGER_DAILY                 = 2,
    TASK_TRIGGER_WEEKLY                = 3,
    TASK_TRIGGER_MONTHLY               = 4,
    TASK_TRIGGER_MONTHLYDOW            = 5,
    TASK_TRIGGER_IDLE                  = 6,
    TASK_TRIGGER_REGISTRATION          = 7,
    TASK_TRIGGER_BOOT                  = 8,
    TASK_TRIGGER_LOGON                 = 9,
    TASK_TRIGGER_SESSION_STATE_CHANGE  = 11
}
"@

Function Get-PropertyValue($task_property, $com, $property) {
    $raw_value = $com.$property

    if ($raw_value -eq $null) {
        return $null
    } elseif ($raw_value.GetType().Name -eq "__ComObject") {
        $com_values = @{}
        $properties = Get-Member -InputObject $raw_value -MemberType Property | % {
            $com_value = Get-PropertyValue -task_property $property -com $raw_value -property $_.Name
            $com_values.$($_.Name) = $com_value
        }

        return ,$com_values
    }

    switch ($property) {
        DaysOfWeek {
            $value_list = @()
            $map = @(
                @{ day = "sunday"; bitwise = 0x01 }
                @{ day = "monday"; bitwise = 0x02 }
                @{ day = "tuesday"; bitwise = 0x04 }
                @{ day = "wednesday"; bitwise = 0x08 }
                @{ day = "thursday"; bitwise = 0x10 }
                @{ day = "friday"; bitwise = 0x20 }
                @{ day = "saturday"; bitwise = 0x40 }
            )
            foreach ($entry in $map) {
                $day = $entry.day
                $bitwise = $entry.bitwise
                if ($raw_value -band $bitwise) {
                    $value_list += $day
                }
            }

            $value = $value_list -join ","
            break
        }
        DaysOfMonth {
            $value_list = @()
            $map = @(
                @{ day = "1"; bitwise = 0x01 }
                @{ day = "2"; bitwise = 0x02 }
                @{ day = "3"; bitwise = 0x04 }
                @{ day = "4"; bitwise = 0x08 }
                @{ day = "5"; bitwise = 0x10 }
                @{ day = "6"; bitwise = 0x20 }
                @{ day = "7"; bitwise = 0x40 }
                @{ day = "8"; bitwise = 0x80 }
                @{ day = "9"; bitwise = 0x100 }
                @{ day = "10"; bitwise = 0x200 }
                @{ day = "11"; bitwise = 0x400 }
                @{ day = "12"; bitwise = 0x800 }
                @{ day = "13"; bitwise = 0x1000 }
                @{ day = "14"; bitwise = 0x2000 }
                @{ day = "15"; bitwise = 0x4000 }
                @{ day = "16"; bitwise = 0x8000 }
                @{ day = "17"; bitwise = 0x10000 }
                @{ day = "18"; bitwise = 0x20000 }
                @{ day = "19"; bitwise = 0x40000 }
                @{ day = "20"; bitwise = 0x80000 }
                @{ day = "21"; bitwise = 0x100000 }
                @{ day = "22"; bitwise = 0x200000 }
                @{ day = "23"; bitwise = 0x400000 }
                @{ day = "24"; bitwise = 0x800000 }
                @{ day = "25"; bitwise = 0x1000000 }
                @{ day = "26"; bitwise = 0x2000000 }
                @{ day = "27"; bitwise = 0x4000000 }
                @{ day = "28"; bitwise = 0x8000000 }
                @{ day = "29"; bitwise = 0x10000000 }
                @{ day = "30"; bitwise = 0x20000000 }
                @{ day = "31"; bitwise = 0x40000000 }
            )

            foreach ($entry in $map) {
                $day = $entry.day
                $bitwise = $entry.bitwise
                if ($raw_value -band $bitwise) {
                    $value_list += $day
                }
            }

            $value = $value_list -join ","
            break
        }
        WeeksOfMonth {
            $value_list = @()
            $map = @(
                @{ week = "1"; bitwise = 0x01 }
                @{ week = "2"; bitwise = 0x02 }
                @{ week = "3"; bitwise = 0x04 }
                @{ week = "4"; bitwise = 0x04 }
            )

            foreach ($entry in $map) {
                $week = $entry.week
                $bitwise = $entry.bitwise
                if ($raw_value -band $bitwise) {
                    $value_list += $week
                }
            }

            $value = $value_list -join ","
            break
        }
        MonthsOfYear {
            $value_list = @()
            $map = @(
                @{ month = "january"; bitwise = 0x01 }
                @{ month = "february"; bitwise = 0x02 }
                @{ month = "march"; bitwise = 0x04 }
                @{ month = "april"; bitwise = 0x08 }
                @{ month = "may"; bitwise = 0x10 }
                @{ month = "june"; bitwise = 0x20 }
                @{ month = "july"; bitwise = 0x40 }
                @{ month = "august"; bitwise = 0x80 }
                @{ month = "september"; bitwise = 0x100 }
                @{ month = "october"; bitwise = 0x200 }
                @{ month = "november"; bitwise = 0x400 }
                @{ month = "december"; bitwise = 0x800 }
            )

            foreach ($entry in $map) {
                $month = $entry.month
                $bitwise = $entry.bitwise
                if ($raw_value -band $bitwise) {
                    $value_list += $month
                }
            }

            $value = $value_list -join ","
            break
        }
        Type {
            if ($task_property -eq "actions") {
                $value = [Enum]::ToObject([TASK_ACTION_TYPE], $raw_value).ToString()
            } elseif ($task_property -eq "triggers") {
                $value = [Enum]::ToObject([TASK_TRIGGER_TYPE2], $raw_value).ToString()
            }
            break
        }
        RunLevel {
            $value = [Enum]::ToObject([TASK_RUN_LEVEL], $raw_value).ToString()
            break
        }
        LogonType {
            $value = [Enum]::ToObject([TASK_LOGON_TYPE], $raw_value).ToString()
            break
        }
        UserId {
            $sid = Convert-ToSID -account_name $raw_value
            $value = Convert-FromSid -sid $sid
        }
        GroupId {
            $sid = Convert-ToSID -account_name $raw_value
            $value = Convert-FromSid -sid $sid
        }
        default {
            $value = $raw_value
            break
        }
    }

    return ,$value
}

$service = New-Object -ComObject Schedule.Service
try {
    $service.Connect()
} catch {
    Fail-Json -obj $result -message "failed to connect to the task scheduler service: $($_.Exception.Message)"
}

try {
    $task_folder = $service.GetFolder($path)
    $result.folder_exists = $true
} catch {
    $result.folder_exists = $false
    $task_folder = $null
}

$folder_tasks = $task_folder.GetTasks(1)
$folder_task_names = @()
$folder_task_count = 0
$task = $null
for ($i = 1; $i -le $folder_tasks.Count; $i++) {
    $task_name = $folder_tasks.Item($i).Name
    $folder_task_names += $task_name
    $folder_task_count += 1

    if ($name -ne $null -and $task_name -eq $name) {
        $task = $folder_tasks.Item($i)
    }
}
$result.folder_task_names = $folder_task_names
$result.folder_task_count = $folder_task_count

if ($name -ne $null) {
    if ($task -ne $null) {
        $result.task_exists = $true

        # task state
        $result.state = @{
            last_run_time = (Get-Date $task.LastRunTime -Format s)
            last_task_result = $task.LastTaskResult
            next_run_time = (Get-Date $task.NextRunTime -Format s)
            number_of_missed_runs = $task.NumberOfMissedRuns
            status = [Enum]::ToObject([TASK_STATE], $task.State).ToString()
        }

        # task definition
        $task_definition = $task.Definition
        $ignored_properties = @("XmlText")
        $properties = @("principal", "registration_info", "settings")
        $collection_properties = @("actions", "triggers")

        foreach ($property in $properties) {
            $property_name = $property -replace "_"
            $result.$property = @{}
            $values = $task_definition.$property_name
            Get-Member -InputObject $values -MemberType Property | % {
                if ($_.Name -notin $ignored_properties) {
                    $result.$property.$($_.Name) = (Get-PropertyValue -task_property $property -com $values -property $_.Name)
                }
            }
        }

        foreach ($property in $collection_properties) {
            $result.$property = @()
            $collection = $task_definition.$property
            $collection_count = $collection.Count
            for ($i = 1; $i -le $collection_count; $i++) {
                $item = $collection.Item($i)
                $item_info = @{}

                Get-Member -InputObject $item -MemberType Property | % {
                    if ($_.Name -notin $ignored_properties) {
                        $item_info.$($_.Name) = (Get-PropertyValue -task_property $property -com $item -property $_.Name)
                    }
                }
                $result.$property += $item_info
            }
        }    
    } else {
        $result.task_exists = $false
    }
}

$result = Convert-DictToSnakeCase -dict $result

Exit-Json -obj $result

