function SharedSteps {
    git fetch origin
    git checkout master;git reset --hard origin/master; git pull
    git checkout $featurebranch;git reset --hard origin/$featurebranch; git pull;
}

function SharedPostSteps {
        param(
        [boolean] $checkForConflicts
    )
    $statusOutput = git status --porcelain
    $cleanDirectory = $statusOutput.length -eq 0
    If ($cleanDirectory -and  $checkForConflicts) {
        Write-Warning "Nice merge (0 Conflicts). Now Running the Build, always build the project locally before pushing to origin"
        gitk
    }
    elseif($conflicts){
        Write-Warning "Conflicts found. Fix them and always build the project locally before pushing to origin"
        Write-Warning "Opening VS Code to see conflicts"
        Write-Warning "Get you out of a horrifying merge? say git merge --abort"
        code .
    }
    else{
        Write-Warning "Opening VS Code to preview staged chnages"
        Write-Warning "Press Ctl+C to skip this step..."
        Write-Warning "Get you out of a horrifying merge? say git merge --abort"
        code .
    }

}

function MergeFeatureBranch {
    param(
        [string] $featurebranch,
        [string] $options
    )

    $statusOutput = git status --porcelain
    $cleanDirectory = $statusOutput.length -eq 0
    $cleanDirectoryText = If ($cleanDirectory) {
        "Working Directory is clean"
    } Else {
        "Pending Work in Directory"
    }
    Write-Host $cleanDirectoryText;

    if(-not $cleanDirectory){
        Write-Host "Aborted. Please save/commit your local changes";
        return
    }

    try{

        $date = Get-Date -UFormat "%Y-%m-%d-%H-%M-%S"
        $userName = git config user.name
        $optionAuto ="Merging (No PR) master into local '$featurebranch' directly, if there're conflicts (banching & PR)"
        $optionNoPR = "Merging (No PR) master into local '$featurebranch' directly"
        $optionPreviewToMaster =  "Preview Merging '$featurebranch' into Master (what the branch has so far)"
        $optionWithPR =  "Merging (With PR) master into '$featurebranch' (branching off '$featurebranch')"
        $optionPreviewToBranch =  "Preview Merging master to '$featurebranch' (how differnt is master)"
        $optionHotFixToMaster =  "Merging (With PR) hotfix into master (branching off master)"

        if($options -Contains "-no-pr"){
            SharedSteps
            Write-Host $optionNoPR
            git merge master;
            SharedPostSteps  -checkForConflicts $true
        }
        elseif($options -Contains "-re"){
            SharedSteps
            Write-Host $optionPreviewToMaster
            git checkout master;
            git merge --no-commit --no-ff $featurebranch
            SharedPostSteps  -checkForConflicts $false
        }
        elseif($options -Contains "-pr"){
            SharedSteps
            Write-Host $optionWithPR
            git checkout -b $userName/master-MergeMasterInto-$featurebranch-$date;git merge master;
            SharedPostSteps  -checkForConflicts $true
        }
        elseif($options -Contains "-n"){
            SharedSteps
            Write-Host $optionPreviewToBranch
            git merge --no-commit --no-ff master
            SharedPostSteps  -checkForConflicts $false
        }
        elseif($options -Contains "-auto"){
            SharedSteps
            Write-Host $optionAuto
            git merge master;
            $statusOutput = git status --porcelain
            $cleanDirectory = $statusOutput.length -eq 0
            If (-not $cleanDirectory) {
                Write-Warning "Conflicts found. Switching to PR option"
                git merge --abort
                SharedSteps
                Write-Host $optionWithPR
                git checkout -b $userName/master-MergeMasterInto-$featurebranch-$date;git merge master;
            }
            SharedPostSteps  -checkForConflicts $true
        }
        elseif($options -Contains "-hotfix"){
            $featurebranch = "hotfix"
            SharedSteps
            Write-Host $optionHotFixToMaster
            git checkout master;
            git checkout -b $userName/master-MergeHotfix-into-master-$date;git merge hotfix;
            SharedPostSteps -checkForConflicts $true
        }
        else{
            Write-Host
            Write-Host "-auto `t" $optionAuto
            Write-Host "-pr `t" $optionWithPR
            Write-Host "-no-pr `t" $optionNoPR
            Write-Host "-n `t" $optionPreviewToBranch
            Write-Host "-re `t" $optionPreviewToMaster
            Write-Host "-hotfix `t" $optionHotFixToMaster
            Write-Host
        }

    }
    catch {
        $exception = $_.exception | Format-List -force | Out-String
        Write-Warning  "Unexpected Error Mergeing Feature branch '$featurebranch':"
        Write-Host  $exception
    }
}


Export-ModuleMember -Function @(
    "MergeFeatureBranch"
)