# Chanora Windows build helper.
#
# Run this from an elevated PowerShell on a Windows host that has
# already completed §4 of `docs/release/windows-build.md`:
# - Visual Studio 2022 Build Tools with the C++ Desktop workload
# - Rust stable (x86_64-pc-windows-msvc target)
# - Flutter 3.41.9 stable on PATH
# - flutter_rust_bridge_codegen 2.12.0 (only needed if regenerating bindings)
# - CMake on PATH
#
# Usage (from the repo root C:\chanora):
#   .\tools\build-windows.ps1
#   .\tools\build-windows.ps1 -SkipRustBuild        # if target/ is cached and unchanged
#   .\tools\build-windows.ps1 -RegenerateBindings   # if you changed bridge API
#
# Produces:
#   target\release\chanora_bridge.dll
#   apps\chanora_flutter\build\windows\x64\runner\Release\chanora_flutter.exe
#   apps\chanora_flutter\build\windows\x64\runner\Release\chanora_bridge.dll  (copied)
#   chanora-<version>-windows-x64.zip  (release bundle)

[CmdletBinding()]
param(
    [switch]$SkipRustBuild,
    [switch]$RegenerateBindings,
    [string]$Version = 'v0.2.0-beta.1'
)

$ErrorActionPreference = 'Stop'

$repoRoot = (Resolve-Path "$PSScriptRoot\..").Path
Set-Location $repoRoot
Write-Host ('=' * 72) -ForegroundColor Cyan
Write-Host "Chanora Windows build" -ForegroundColor Cyan
Write-Host "Repo root : $repoRoot"
Write-Host "Version   : $Version"
Write-Host ('=' * 72) -ForegroundColor Cyan

function Assert-Tool {
    param([string]$Name, [string]$VersionFlag = '--version')
    $cmd = Get-Command $Name -ErrorAction SilentlyContinue
    if (-not $cmd) {
        throw "Required tool not on PATH: $Name. See docs/release/windows-build.md §4."
    }
    $ver = & $Name $VersionFlag 2>&1 | Select-Object -First 1
    Write-Host "  $Name : $ver"
}

Write-Host "`n[1/6] Verify toolchain" -ForegroundColor Yellow
Assert-Tool flutter
Assert-Tool cargo
Assert-Tool rustc
Assert-Tool cmake
Assert-Tool git

# Ensure the Windows target is installed.
$targets = & rustup target list --installed 2>&1
if ($targets -notmatch 'x86_64-pc-windows-msvc') {
    Write-Host "  Adding rustup target x86_64-pc-windows-msvc..."
    rustup target add x86_64-pc-windows-msvc
}

# ---------- 2. Add the Windows platform if missing ----------
$flutterApp = Join-Path $repoRoot 'apps\chanora_flutter'
$winFolder  = Join-Path $flutterApp 'windows'
if (-not (Test-Path $winFolder)) {
    Write-Host "`n[2/6] Add Windows platform to apps\chanora_flutter" -ForegroundColor Yellow
    Push-Location $flutterApp
    & flutter create --platforms=windows .
    if ($LASTEXITCODE -ne 0) { throw 'flutter create --platforms=windows failed' }
    Pop-Location
} else {
    Write-Host "`n[2/6] Windows platform already present in apps\chanora_flutter" -ForegroundColor Yellow
}

# ---------- 3. (Optional) Regenerate FRB bindings ----------
if ($RegenerateBindings) {
    Write-Host "`n[3/6] Regenerate flutter_rust_bridge bindings" -ForegroundColor Yellow
    Assert-Tool flutter_rust_bridge_codegen
    & flutter_rust_bridge_codegen generate
    if ($LASTEXITCODE -ne 0) { throw 'flutter_rust_bridge_codegen generate failed' }
} else {
    Write-Host "`n[3/6] Skipping FRB codegen (use -RegenerateBindings if api.rs changed)" -ForegroundColor Yellow
}

# ---------- 4. Build the Rust cdylib for x86_64-pc-windows-msvc ----------
if (-not $SkipRustBuild) {
    Write-Host "`n[4/6] cargo build --release -p chanora_bridge" -ForegroundColor Yellow
    & cargo build --release -p chanora_bridge --target x86_64-pc-windows-msvc
    if ($LASTEXITCODE -ne 0) { throw 'cargo build chanora_bridge failed' }
} else {
    Write-Host "`n[4/6] Skipping Rust build" -ForegroundColor Yellow
}

$bridgeDll = Join-Path $repoRoot 'target\x86_64-pc-windows-msvc\release\chanora_bridge.dll'
if (-not (Test-Path $bridgeDll)) {
    # Fallback to host triple if --target wasn't explicit elsewhere.
    $bridgeDll = Join-Path $repoRoot 'target\release\chanora_bridge.dll'
}
if (-not (Test-Path $bridgeDll)) {
    throw "Bridge DLL not found at $bridgeDll. Check cargo build output."
}
Write-Host "  Bridge DLL: $bridgeDll"

# ---------- 5. flutter build windows --release ----------
Write-Host "`n[5/6] flutter build windows --release" -ForegroundColor Yellow
Push-Location $flutterApp
& flutter pub get
if ($LASTEXITCODE -ne 0) { throw 'flutter pub get failed' }
& flutter build windows --release
if ($LASTEXITCODE -ne 0) { throw 'flutter build windows failed' }
Pop-Location

$releaseDir = Join-Path $flutterApp 'build\windows\x64\runner\Release'
$exe        = Join-Path $releaseDir 'chanora_flutter.exe'
if (-not (Test-Path $exe)) {
    throw "Expected EXE not found at $exe"
}

# Drop the bridge DLL next to the EXE so dart:ffi finds it.
Copy-Item $bridgeDll $releaseDir -Force
Write-Host "  Bundle dir : $releaseDir"
Write-Host "  EXE        : $exe"
Write-Host "  Bridge DLL : $(Join-Path $releaseDir 'chanora_bridge.dll')"

# ---------- 6. Package the bundle ----------
Write-Host "`n[6/6] Package release zip" -ForegroundColor Yellow
$zipName = "chanora-$Version-windows-x64.zip"
$zipPath = Join-Path $repoRoot $zipName
if (Test-Path $zipPath) { Remove-Item $zipPath -Force }
Compress-Archive -Path (Join-Path $releaseDir '*') -DestinationPath $zipPath
$zipInfo = Get-Item $zipPath
Write-Host "  Zip        : $($zipInfo.FullName)"
Write-Host "  Size       : $([math]::Round($zipInfo.Length / 1MB, 1)) MiB"

Write-Host "`n$('=' * 72)" -ForegroundColor Green
Write-Host "Build complete." -ForegroundColor Green
Write-Host "$('=' * 72)" -ForegroundColor Green
Write-Host "Artefacts:"
Write-Host "  EXE        : $exe"
Write-Host "  Bridge DLL : $(Join-Path $releaseDir 'chanora_bridge.dll')"
Write-Host "  Bundle dir : $releaseDir"
Write-Host "  Zip        : $zipPath"