[CmdletBinding()]
param(
    [string]$RepositoryRoot = "",
    [string]$RemoteName = "origin",
    [string]$RemoteUrl = "https://git.tuxinet.dk/thomas/TuxDMX-WebUI.git",
    [string]$Branch = "main",
    [string]$CommitMessage = "Update TuxDMX",
    [string[]]$StageExclude = @(
        ".pnpm-store/**",
        "node_modules/**",
        ".venv/**",
        "__pycache__/**",
        ".pytest_cache/**",
        ".ruff_cache/**",
        ".mypy_cache/**",
        "frontend/dist/**",
        "backend/.pytest_cache/**",
        "backend/htmlcov/**",
        "data/**",
        ".env"
    ),
    [switch]$InitIfNeeded,
    [switch]$SetOrigin,
    [switch]$StageAll,
    [switch]$Commit,
    [switch]$Push
)

Set-StrictMode -Version Latest
$ErrorActionPreference = "Stop"

function Write-Info {
    param([string]$Message)
    Write-Host "[TuxDMX] $Message"
}

function Normalize-RepoPath {
    param([string]$Path)
    return ($Path -replace "\\", "/").Trim()
}

function Test-IsExcludedPath {
    param(
        [string]$Path,
        [string[]]$Patterns
    )

    $normalizedPath = Normalize-RepoPath -Path $Path

    foreach ($pattern in $Patterns) {
        $normalizedPattern = Normalize-RepoPath -Path $pattern

        if ($normalizedPattern.EndsWith("/**")) {
            $prefix = $normalizedPattern.Substring(0, $normalizedPattern.Length - 3).TrimEnd("/")
            if ($normalizedPath -eq $prefix -or $normalizedPath.StartsWith("$prefix/")) {
                return $true
            }
            continue
        }

        if ($normalizedPath -eq $normalizedPattern) {
            return $true
        }
    }

    return $false
}

function Invoke-Git {
    param(
        [Parameter(Mandatory = $true)]
        [string[]]$Arguments,
        [switch]$IgnoreFailure
    )

    & git -C $RepositoryRoot @Arguments
    $exitCode = $LASTEXITCODE

    if (-not $IgnoreFailure -and $exitCode -ne 0) {
        throw "git $($Arguments -join ' ') fejlede med exit code $exitCode."
    }

    return $exitCode
}

if (-not (Get-Command git -ErrorAction SilentlyContinue)) {
    throw "Git blev ikke fundet i PATH."
}

if ([string]::IsNullOrWhiteSpace($RepositoryRoot)) {
    $scriptRoot = if (-not [string]::IsNullOrWhiteSpace($PSScriptRoot)) {
        $PSScriptRoot
    } else {
        Split-Path -Parent $PSCommandPath
    }
    $RepositoryRoot = (Resolve-Path (Join-Path $scriptRoot "..")).Path
}

$gitDirectory = Join-Path $RepositoryRoot ".git"

if (-not (Test-Path $gitDirectory)) {
    if (-not $InitIfNeeded) {
        throw "RepositoryRoot er ikke et git-repository endnu. Koer med -InitIfNeeded for at initialisere det."
    }

    Write-Info "Initialiserer git-repository paa branch '$Branch'."
    & git -C $RepositoryRoot init -b $Branch
    if ($LASTEXITCODE -ne 0) {
        throw "git init fejlede med exit code $LASTEXITCODE."
    }
}

Write-Info "Repo: $RepositoryRoot"
Write-Info "Remote: $RemoteName -> $RemoteUrl"

$remoteExists = $false
$currentRemoteUrl = ""

& git -C $RepositoryRoot remote get-url $RemoteName *> $null
if ($LASTEXITCODE -eq 0) {
    $remoteExists = $true
    $currentRemoteUrl = (& git -C $RepositoryRoot remote get-url $RemoteName).Trim()
}

if ($SetOrigin) {
    if ($remoteExists) {
        if ($currentRemoteUrl -ne $RemoteUrl) {
            Write-Info "Opdaterer remote '$RemoteName'."
            Invoke-Git -Arguments @("remote", "set-url", $RemoteName, $RemoteUrl) | Out-Null
        } else {
            Write-Info "Remote '$RemoteName' peger allerede paa den oenskede URL."
        }
    } else {
        Write-Info "Tilfoejer remote '$RemoteName'."
        Invoke-Git -Arguments @("remote", "add", $RemoteName, $RemoteUrl) | Out-Null
        $remoteExists = $true
    }
}

if ($StageAll) {
    Write-Info "Stager alle aendringer."
    Write-Info ("Ekskluderer fra staging: " + ($StageExclude -join ", "))

    Invoke-Git -Arguments @("add", "--update", "--", ".") | Out-Null

    $untrackedFiles = & git -C $RepositoryRoot ls-files --others --exclude-standard --full-name
    if ($LASTEXITCODE -ne 0) {
        throw "Kunne ikke hente untracked filer fra git."
    }

    $filesToStage = @()
    foreach ($file in $untrackedFiles) {
        if ([string]::IsNullOrWhiteSpace($file)) {
            continue
        }
        if (-not (Test-IsExcludedPath -Path $file -Patterns $StageExclude)) {
            $filesToStage += $file.Trim()
        }
    }

    if ($filesToStage.Count -gt 0) {
        Invoke-Git -Arguments (@("add", "--") + $filesToStage) | Out-Null
    }
}

if ($Commit) {
    Write-Info "Opretter commit."
    & git -C $RepositoryRoot diff --cached --quiet
    if ($LASTEXITCODE -eq 0) {
        throw "Der er ingen staged aendringer at committe."
    }
    Invoke-Git -Arguments @("commit", "-m", $CommitMessage) | Out-Null
}

$currentBranch = (& git -C $RepositoryRoot branch --show-current).Trim()
if ([string]::IsNullOrWhiteSpace($currentBranch)) {
    $currentBranch = $Branch
}

if ($Push) {
    if (-not $remoteExists) {
        throw "Remote '$RemoteName' findes ikke endnu. Koer med -SetOrigin foerst."
    }

    Write-Info "Pusher '$currentBranch' til '$RemoteName/$Branch'."
    Invoke-Git -Arguments @("push", "-u", $RemoteName, "$currentBranch`:$Branch") | Out-Null
}

Write-Info "Git status:"
Invoke-Git -Arguments @("status", "--short") -IgnoreFailure | Out-Null

Write-Info "Faerdig."