# ============================================================
# Plom Mods Installer
# Installs Fabric + mods for Minecraft 26.1.2
# https://mods.plom.one
# ============================================================

$ErrorActionPreference = "Stop"
$MC_VERSION = "26.1.2"
$FABRIC_INSTALLER_VERSION = "1.1.1"

Write-Host ""
Write-Host "=================================" -ForegroundColor Cyan
Write-Host "   Plom Mods Installer" -ForegroundColor Cyan
Write-Host "   Minecraft $MC_VERSION + Fabric" -ForegroundColor Cyan
Write-Host "=================================" -ForegroundColor Cyan
Write-Host ""

# ── Step 1: Find .minecraft ───────────────────────────────────────────────────
$mcDir = "$env:APPDATA\.minecraft"
if (-not (Test-Path $mcDir)) {
    Write-Host "ERROR: .minecraft folder not found at $mcDir" -ForegroundColor Red
    Write-Host "Please open the Minecraft Launcher and log in first, then re-run." -ForegroundColor Yellow
    exit 1
}
Write-Host "[1/4] .minecraft: $mcDir" -ForegroundColor Green

# ── Step 2: Find Java ─────────────────────────────────────────────────────────
Write-Host "[2/4] Finding Java..." -ForegroundColor Yellow

$javaExe = $null

# Prefer Minecraft's own bundled JRE (always present if you've launched the game)
$runtimeDir = "$mcDir\runtime"
if (Test-Path $runtimeDir) {
    $javaExe = Get-ChildItem -Path $runtimeDir -Filter "java.exe" -Recurse -ErrorAction SilentlyContinue |
        Sort-Object -Property FullName -Descending |
        Select-Object -First 1 -ExpandProperty FullName
}

# Fall back to whatever java is on PATH
if (-not $javaExe) {
    $systemJava = Get-Command java -ErrorAction SilentlyContinue
    if ($systemJava) { $javaExe = $systemJava.Source }
}

if (-not $javaExe) {
    Write-Host "ERROR: Java not found." -ForegroundColor Red
    Write-Host "Please launch Minecraft $MC_VERSION at least once so it installs its bundled Java." -ForegroundColor Yellow
    exit 1
}
Write-Host "[2/4] Java: $javaExe" -ForegroundColor Green

# ── Step 3: Install Fabric ────────────────────────────────────────────────────
Write-Host "[3/4] Installing Fabric..." -ForegroundColor Yellow

# Fabric installer (and mod file replacement) will fail if the game is running
while (@(Get-Process -Name "javaw", "Minecraft", "MinecraftLauncher" -ErrorAction SilentlyContinue).Count -gt 0) {
    Write-Host ""
    Write-Host "      Minecraft is currently running!" -ForegroundColor Red
    Write-Host "      Please close the game and the Minecraft Launcher, then press Enter to continue." -ForegroundColor Yellow
    Read-Host "      Press Enter when Minecraft is closed"
}

# Get latest Fabric loader version for this MC version
$loaderData = Invoke-RestMethod "https://meta.fabricmc.net/v2/versions/loader/$MC_VERSION"
$loaderVersion = $loaderData[0].loader.version
Write-Host "      Loader: $loaderVersion"

# Download Fabric installer
$installerUrl = "https://maven.fabricmc.net/net/fabricmc/fabric-installer/$FABRIC_INSTALLER_VERSION/fabric-installer-$FABRIC_INSTALLER_VERSION.jar"
$installerJar = "$env:TEMP\fabric-installer-$FABRIC_INSTALLER_VERSION.jar"
Write-Host "      Downloading Fabric installer $FABRIC_INSTALLER_VERSION..."
Invoke-WebRequest $installerUrl -OutFile $installerJar -UseBasicParsing

# Run the installer (CLI mode - no GUI since we pass flags)
Write-Host "      Running installer (may take a moment if downloading game files)..."
& $javaExe -jar $installerJar client -mcversion $MC_VERSION -loader $loaderVersion -dir $mcDir
if ($LASTEXITCODE -ne 0) {
    Write-Host "      Note: installer exited $LASTEXITCODE (Fabric may already be installed)" -ForegroundColor Yellow
}

Write-Host "[3/4] Fabric ready." -ForegroundColor Green

# ── Step 4: Download Mods ─────────────────────────────────────────────────────
Write-Host "[4/4] Downloading mods..." -ForegroundColor Yellow

$modsDir = "$mcDir\mods"
if (-not (Test-Path $modsDir)) {
    New-Item -ItemType Directory -Path $modsDir | Out-Null
}

# Prompt before clearing existing mods
$oldJars = @(Get-ChildItem -Path $modsDir -Filter "*.jar" -ErrorAction SilentlyContinue)
if ($oldJars.Count -gt 0) {
    Write-Host ""
    Write-Host "      Found $($oldJars.Count) existing mod(s):" -ForegroundColor Yellow
    $oldJars | ForEach-Object { Write-Host "        - $($_.Name)" }
    Write-Host ""
    $choice = Read-Host "      Delete existing mods before installing? [Y/n]"
    if ($choice -eq "" -or $choice -match "^[Yy]") {
        Write-Host "      Removing old mod file(s)..."
        $oldJars | Remove-Item -Force
    } else {
        Write-Host "      Keeping existing mods (new mods will be added alongside them)." -ForegroundColor Cyan
    }
    Write-Host ""
}

# Modrinth project slugs / IDs
$mods = @(
    "fabric-api",   # Required by almost everything
    "sodium",       # Performance - better rendering
    "lithium",      # Performance - game logic optimizations
    "appleskin",    # Shows food saturation info
    "chat-heads",   # Player heads next to chat messages
    "fxxUqruK"      # Voxy - long-distance rendering
)

$gvParam = [uri]::EscapeDataString('["' + $MC_VERSION + '"]')
$ldParam  = [uri]::EscapeDataString('["fabric"]')

foreach ($modId in $mods) {
    try {
        $apiUrl = "https://api.modrinth.com/v2/project/$modId/version?game_versions=$gvParam&loaders=$ldParam"
        $versions = Invoke-RestMethod $apiUrl

        if (-not $versions -or $versions.Count -eq 0) {
            Write-Host "      [SKIP] No Fabric/$MC_VERSION release found for: $modId" -ForegroundColor Yellow
            continue
        }

        $file = $versions[0].files | Where-Object { $_.primary } | Select-Object -First 1
        if (-not $file) { $file = $versions[0].files[0] }

        Write-Host "      + $($file.filename)"
        Invoke-WebRequest $file.url -OutFile "$modsDir\$($file.filename)" -UseBasicParsing
    } catch {
        Write-Host "      [FAIL] $modId`: $_" -ForegroundColor Red
    }
}

Write-Host "[4/4] Mods downloaded." -ForegroundColor Green

# ── Done ──────────────────────────────────────────────────────────────────────
Write-Host ""
Write-Host "All done!" -ForegroundColor Green
Write-Host "Open the Minecraft Launcher and select the Fabric profile to play:" -ForegroundColor White
Write-Host "  fabric-loader-$loaderVersion-$MC_VERSION" -ForegroundColor Cyan
Write-Host ""