param(
    [string]$DefaultVideoUrl = "https://youtu.be/EExM3dueOeM",
    [string]$DefaultOutputLanguage = "es",
    [string]$DefaultInputLanguage = "",
    [string]$DefaultLmStudioBaseUrl = "http://127.0.0.1:1234/v1",
    [string]$DefaultLmStudioApiKey = "lm-studio",
    [string]$DefaultLmStudioModel = "gemma-3-4b-it"
)

$ErrorActionPreference = "Stop"

function Read-Value {
    param(
        [Parameter(Mandatory = $true)]
        [string]$Prompt,
        [string]$DefaultValue = "",
        [switch]$Required
    )

    if ($DefaultValue) {
        $value = Read-Host "$Prompt [$DefaultValue]"
        if ([string]::IsNullOrWhiteSpace($value)) {
            $value = $DefaultValue
        }
    }
    else {
        $value = Read-Host $Prompt
    }

    if ($Required -and [string]::IsNullOrWhiteSpace($value)) {
        throw "A value is required for: $Prompt"
    }

    return $value.Trim()
}

$repoRoot = Split-Path -Parent $MyInvocation.MyCommand.Path
$pythonExe = Join-Path $repoRoot ".venv\Scripts\python.exe"
$mainPy = Join-Path $repoRoot "main.py"
$logsDir = Join-Path $repoRoot "logs"
$timestamp = Get-Date -Format "yyyyMMdd-HHmmss"
$logFile = Join-Path $logsDir "auto-dub-$timestamp.log"

if (-not (Test-Path $pythonExe)) {
    throw "Python executable not found at $pythonExe. Create the UV environment first."
}

if (-not (Test-Path $mainPy)) {
    throw "main.py not found at $mainPy."
}

New-Item -ItemType Directory -Force -Path $logsDir | Out-Null

Write-Host ""
Write-Host "YouTube Auto Dub Launcher" -ForegroundColor Cyan
Write-Host "Repo: $repoRoot"
Write-Host "Log file: $logFile"
Write-Host ""
Write-Host "Leave input language blank to let Whisper auto-detect it." -ForegroundColor Yellow
Write-Host ""

$videoUrl = Read-Value -Prompt "Video URL" -DefaultValue $DefaultVideoUrl -Required
$outputLanguage = Read-Value -Prompt "Output language code" -DefaultValue $DefaultOutputLanguage -Required
$inputLanguage = Read-Value -Prompt "Input language code (optional)" -DefaultValue $DefaultInputLanguage
$lmStudioBaseUrl = Read-Value -Prompt "LM Studio base URL" -DefaultValue $DefaultLmStudioBaseUrl -Required
$lmStudioApiKey = Read-Value -Prompt "LM Studio API key" -DefaultValue $DefaultLmStudioApiKey -Required
$lmStudioModel = Read-Value -Prompt "LM Studio model" -DefaultValue $DefaultLmStudioModel -Required

$env:LM_STUDIO_BASE_URL = $lmStudioBaseUrl
$env:LM_STUDIO_API_KEY = $lmStudioApiKey
$env:LM_STUDIO_MODEL = $lmStudioModel

$commandArgs = @(
    $mainPy,
    $videoUrl,
    "--lang",
    $outputLanguage
)

if (-not [string]::IsNullOrWhiteSpace($inputLanguage)) {
    $env:SOURCE_LANGUAGE_HINT = $inputLanguage
    Write-Host "Using input language hint: $inputLanguage" -ForegroundColor Yellow
}
else {
    Remove-Item Env:SOURCE_LANGUAGE_HINT -ErrorAction SilentlyContinue
}

Write-Host ""
Write-Host "Running with:" -ForegroundColor Cyan
Write-Host "  Video URL: $videoUrl"
Write-Host "  Output language: $outputLanguage"
Write-Host "  LM Studio URL: $lmStudioBaseUrl"
Write-Host "  LM Studio model: $lmStudioModel"
if ($inputLanguage) {
    Write-Host "  Input language hint: $inputLanguage"
}
else {
    Write-Host "  Input language hint: auto-detect"
}
Write-Host ""

Push-Location $repoRoot
try {
    $commandLine = @($pythonExe) + $commandArgs

    "[$(Get-Date -Format s)] Starting run" | Tee-Object -FilePath $logFile -Append | Out-Null
    "[$(Get-Date -Format s)] Command: $($commandLine -join ' ')" | Tee-Object -FilePath $logFile -Append | Out-Null
    "[$(Get-Date -Format s)] LM_STUDIO_BASE_URL=$lmStudioBaseUrl" | Tee-Object -FilePath $logFile -Append | Out-Null
    "[$(Get-Date -Format s)] LM_STUDIO_MODEL=$lmStudioModel" | Tee-Object -FilePath $logFile -Append | Out-Null
    if ($inputLanguage) {
        "[$(Get-Date -Format s)] SOURCE_LANGUAGE_HINT=$inputLanguage" | Tee-Object -FilePath $logFile -Append | Out-Null
    }

    & $pythonExe @commandArgs 2>&1 | Tee-Object -FilePath $logFile -Append
}
catch {
    Write-Host ""
    Write-Host "The run failed." -ForegroundColor Red
    Write-Host $_.Exception.Message -ForegroundColor Red
    "[$(Get-Date -Format s)] Launcher error: $($_.Exception.Message)" | Tee-Object -FilePath $logFile -Append | Out-Null
}
finally {
    Pop-Location
    Write-Host ""
    Write-Host "Run log saved to: $logFile" -ForegroundColor Cyan
    Read-Host "Press Enter to close"
}