# Builds the so-novel engine jar (from the submodule) and the tool wrapper classes.
# Run once after clone / submodule update:  pwsh tools\build.ps1
param(
    [switch]$Force,        # rebuild so-novel even if runtime\app.jar exists
    [switch]$RefreshRules  # re-copy bundle\rules over runtime\rules
)

$ErrorActionPreference = 'Stop'
. (Join-Path $PSScriptRoot 'lib.ps1')

$p = Get-ToolPaths
Write-Host "[build] project root : $($p.Root)"

# ---------------------------------------------------------------- 1. JDK 21
$jdk = Find-Jdk21 -AllowDownload
if (-not $jdk) { throw 'No JDK 21 available and download failed. Set EBOOK_NOVEL_JAVA_HOME.' }
Write-Host "[build] JDK 21       : $jdk"
$javac = Join-Path $jdk 'bin\javac.exe'
if (-not (Test-Path $javac)) { throw "javac not found in $jdk (a JRE is not enough)" }

# ---------------------------------------------------------------- 2. so-novel app.jar
New-Item -ItemType Directory -Force $p.Runtime | Out-Null
if ($Force -or -not (Test-Path $p.AppJar)) {
    if (-not (Test-Path (Join-Path $p.Vendor 'pom.xml'))) {
        throw 'vendor/so-novel is empty. Run: git submodule update --init --recursive'
    }
    $mvn = Get-Command mvn -ErrorAction SilentlyContinue
    if (-not $mvn) { throw 'Maven (mvn) is required to build so-novel. Install Maven or use a prebuilt app.jar.' }

    Write-Host '[build] mvn package so-novel ...' -ForegroundColor Cyan
    # so-novel 用 <os><arch>x86_64</arch> 激活 javet 原生库 profile，而 Windows JDK 报的是 amd64，
    # 自动激活会失效（导致 JS 规则的书源全部 "Javet library ... not found"），这里显式指定。
    $platformProfile = switch -Regex ("$([System.Runtime.InteropServices.RuntimeInformation]::OSDescription)|$([System.Runtime.InteropServices.RuntimeInformation]::OSArchitecture)") {
        'Windows.*X64'   { 'windows-x64' }
        'Linux.*X64'     { 'linux-x64' }
        'Linux.*Arm64'   { 'linux-arm64' }
        'OSX|Darwin.*X64' { 'macos-x64' }
        'OSX|Darwin.*Arm64' { 'macos-arm64' }
        default { $null }
    }
    if ($platformProfile) {
        Write-Host "[build] javet profile: $platformProfile" -ForegroundColor Cyan
    } else {
        Write-Warning 'Unknown platform, javet native library may be missing (JS-based rules will fail).'
    }
    $previousJavaHome = $env:JAVA_HOME
    $previousPath = $env:PATH
    try {
        $env:JAVA_HOME = $jdk
        $env:PATH = (Join-Path $jdk 'bin') + ';' + $previousPath
        Push-Location $p.Vendor
        try {
            $mvnArgs = @('-B', '-DskipTests', '-Dlaunch4j.skip=true')
            if ($platformProfile) { $mvnArgs += @('-P', $platformProfile) }
            $mvnArgs += @('clean', 'package')
            & $mvn.Source @mvnArgs
            if ($LASTEXITCODE -ne 0) { throw "mvn package failed with exit code $LASTEXITCODE" }
        } finally {
            Pop-Location
        }
    } finally {
        $env:JAVA_HOME = $previousJavaHome
        $env:PATH = $previousPath
    }

    $built = Join-Path $p.Vendor 'target\app-jar-with-dependencies.jar'
    if (-not (Test-Path $built)) { $built = Join-Path $p.Vendor 'target\app.jar' }
    if (-not (Test-Path $built)) { throw 'so-novel build produced no jar in target/' }
    Copy-Item $built $p.AppJar -Force
    Write-Host "[build] app.jar      : $($p.AppJar) ($([math]::Round((Get-Item $p.AppJar).Length / 1MB, 1)) MB)"
} else {
    Write-Host "[build] app.jar      : up to date ($([math]::Round((Get-Item $p.AppJar).Length / 1MB, 1)) MB)"
}

# ---------------------------------------------------------------- 3. rule bundles
New-Item -ItemType Directory -Force $p.Rules | Out-Null
$sourceRules = Join-Path $p.Vendor 'bundle\rules'
foreach ($file in (Get-ChildItem $sourceRules -Filter '*.json*' -File)) {
    $target = Join-Path $p.Rules $file.Name
    if ($RefreshRules -or -not (Test-Path $target)) {
        Copy-Item $file.FullName $target -Force
    }
}
Write-Host "[build] rules        : $((Get-ChildItem $p.Rules -File).Count) files in $($p.Rules)"

# ---------------------------------------------------------------- 4. tool classes
if (Test-Path $p.Classes) { Remove-Item $p.Classes -Recurse -Force }
New-Item -ItemType Directory -Force $p.Classes | Out-Null
$sources = @(Get-ChildItem (Join-Path $p.Tools 'src') -Filter '*.java' -Recurse | ForEach-Object { $_.FullName })
Write-Host '[build] javac        : tool wrapper ...' -ForegroundColor Cyan
& $javac '-encoding' 'UTF-8' '--release' '21' '-cp' $p.AppJar '-d' $p.Classes @sources
if ($LASTEXITCODE -ne 0) { throw "javac failed with exit code $LASTEXITCODE" }

# Optional single-file tool jar (a plain classes dir works too; JBR has no jar.exe).
$jarTool = Find-JarTool
if ($jarTool) {
    & $jarTool '--create' '--file' $p.ToolJar '-C' $p.Classes '.'
    if ($LASTEXITCODE -ne 0) { Write-Warning 'jar packaging failed; the classes directory will be used instead.' }
}

# ---------------------------------------------------------------- 5. runtime config
New-Item -ItemType Directory -Force $p.Books | Out-Null
if ($Force -or -not (Test-Path $p.Config)) {
    $template = Get-Content (Join-Path $p.Tools 'config.ini.template') -Raw
    $ini = $template.Replace('@BOOKS@', ($p.Books -replace '\\', '/'))
    $ini = $ini.Replace('@RULES@', ((Join-Path $p.Rules 'main.json') -replace '\\', '/'))
    [System.IO.File]::WriteAllText($p.Config, $ini, (New-Object System.Text.UTF8Encoding($false)))
    Write-Host "[build] config.ini   : $($p.Config)"
} else {
    Write-Host "[build] config.ini   : kept existing ($($p.Config))"
}

Write-Host ''
Write-Host 'Build finished. Try:  pwsh bin\novel.ps1 sources' -ForegroundColor Green