# Gemini CLI Configuration Script for XCodeCLI (Windows)
# This script configures Gemini CLI to use your XCodeCLI instance
# Automatically tests multiple API endpoints and selects the working one
# Run with: powershell -ExecutionPolicy Bypass -File setup-gemini.ps1 -ApiKey YOUR_KEY

param(
    [string]$ApiKey,
    [switch]$Test,
    [switch]$Show,
    [switch]$Help
)

# Check for pre-set variables from one-liner command
if (-not $ApiKey -and (Test-Path Variable:key)) { $ApiKey = $key }

# Configuration
$DefaultBaseUrl = "https://api2.xcodecli.com"
$GeminiConfigDir = "$env:USERPROFILE\.gemini"
$GeminiEnvFile = "$GeminiConfigDir\.env"

# Color functions for output
function Write-Info {
    param([string]$Message)
    Write-Host "[INFO]" -ForegroundColor Blue -NoNewline
    Write-Host " $Message"
}

function Write-Success {
    param([string]$Message)
    Write-Host "[SUCCESS]" -ForegroundColor Green -NoNewline
    Write-Host " $Message"
}

function Write-Warning {
    param([string]$Message)
    Write-Host "[WARNING]" -ForegroundColor Yellow -NoNewline
    Write-Host " $Message"
}

function Write-Error {
    param([string]$Message)
    Write-Host "[ERROR]" -ForegroundColor Red -NoNewline
    Write-Host " $Message"
}

# Function to show help
function Show-Help {
    Write-Host @"
Gemini CLI Configuration Script for XCodeCLI (Windows)

This script automatically tests multiple API endpoints and selects the working one:
  - https://api2.xcodecli.com
  - https://api.xcodecli.com

Usage: powershell -ExecutionPolicy Bypass -File setup-gemini.ps1 [OPTIONS]

Options:
  -ApiKey <KEY>    Set the API key
  -Test            Test API connections only (requires -ApiKey)
  -Show            Show current settings and exit
  -Help            Show this help message

Examples:
  .\setup-gemini.ps1 -ApiKey your-api-key-here
  .\setup-gemini.ps1 -Test -ApiKey your-api-key-here
  .\setup-gemini.ps1 -Show

Interactive mode (no arguments):
  .\setup-gemini.ps1

One-liner:
  `$key='YOUR_API_KEY'; iwr -useb https://your-domain.tld/setup-gemini.ps1 | iex

PowerShell Execution Policy:
  If you get an execution policy error, run:
  powershell -ExecutionPolicy Bypass -File setup-gemini.ps1
"@
    exit 0
}

# Function to backup existing settings
function Backup-Settings {
    if (Test-Path $GeminiEnvFile) {
        $timestamp = Get-Date -Format "yyyyMMdd_HHmmss"
        $backupFile = "$GeminiEnvFile.backup.$timestamp"
        Copy-Item -Path $GeminiEnvFile -Destination $backupFile
        Write-Info "Backed up existing settings to: $backupFile"
    }
    $settingsJsonPath = "$GeminiConfigDir\settings.json"
    if (Test-Path $settingsJsonPath) {
        $timestamp = Get-Date -Format "yyyyMMdd_HHmmss"
        $backupFile = "$settingsJsonPath.backup.$timestamp"
        Copy-Item -Path $settingsJsonPath -Destination $backupFile
        Write-Info "Backed up existing settings to: $backupFile"
    }
}

# Function to create settings directory
function New-SettingsDirectory {
    if (-not (Test-Path $GeminiConfigDir)) {
        New-Item -ItemType Directory -Path $GeminiConfigDir -Force | Out-Null
        Write-Info "Created Gemini configuration directory: $GeminiConfigDir"
    }
}

# Function to validate API key format
function Test-ApiKey {
    param([string]$ApiKey)
    
    if ($ApiKey -match '^[A-Za-z0-9_-]+$') {
        return $true
    } else {
        Write-Error "Invalid API key format. API key should contain only alphanumeric characters, hyphens, and underscores."
        return $false
    }
}

# Function to test API connection and return working base URL
function Test-ApiConnection {
    param([string]$ApiKey)

    $testUrls = @(
        "https://api2.xcodecli.com",
        "https://api.xcodecli.com"
    )

    Write-Info "Testing API connections..."

    foreach ($baseUrl in $testUrls) {
        Write-Info "Testing $baseUrl..."

        try {
            $headers = @{
                "Content-Type" = "application/json"
                "x-goog-api-key" = $ApiKey
            }

            $testEndpoint = "$baseUrl/v1/models"
            $response = Invoke-RestMethod -Uri $testEndpoint -Method Get -Headers $headers -ErrorAction Stop

            # Check if response contains models
            if ($response.models) {
                $modelCount = $response.models.Count
                Write-Success "API connection successful! Found $modelCount models at $baseUrl"
                return $baseUrl
            } else {
                Write-Warning "API responded but no models found at $baseUrl"
            }
        }
        catch {
            if ($_.Exception.Response -and $_.Exception.Response.StatusCode -eq 401) {
                Write-Warning "API key authentication failed for $baseUrl"
            } elseif ($_.Exception.Message -like "*Unable to connect*" -or $_.Exception.Message -like "*could not be resolved*") {
                Write-Warning "Cannot connect to $baseUrl"
            } else {
                Write-Warning "API test failed for $baseUrl`: $($_.Exception.Message)"
            }
        }
    }

    Write-Error "All API connections failed. Please check your API key and internet connection."
    return $null
}

# Function to create Gemini CLI settings
function New-Settings {
    param(
        [string]$BaseUrl,
        [string]$ApiKey
    )
    
    $envContent = @"
GOOGLE_GEMINI_BASE_URL="$BaseUrl"
GEMINI_API_KEY="$ApiKey"
GEMINI_MODEL="gemini-3-pro-preview"
"@

    $settingsJson = @{
        general = @{
            previewFeatures = $true
        }
        security = @{
            auth = @{
                selectedType = "gemini-api-key"
            }
        }
    }

    try {
        Set-Content -Path $GeminiEnvFile -Value $envContent -Encoding UTF8
        Write-Success "Gemini CLI settings written to: $GeminiEnvFile"

        $settingsJsonPath = "$GeminiConfigDir\settings.json"
        $settingsJson | ConvertTo-Json -Depth 10 | Set-Content -Path $settingsJsonPath -Encoding UTF8
        Write-Success "Gemini CLI settings written to: $settingsJsonPath"
        return $true
    }
    catch {
        Write-Error "Failed to create .env file: $($_.Exception.Message)"
        return $false
    }
}

# Function to display current settings
function Show-Settings {
    if (Test-Path $GeminiEnvFile) {
        Write-Info "Current Gemini CLI settings file ($GeminiEnvFile):"
        Write-Host "----------------------------------------"
        Get-Content $GeminiEnvFile
        Write-Host "----------------------------------------"
    } else {
        Write-Info "No existing Gemini CLI .env file found."
    }
    

}

# Main function
function Main {
    Write-Info "Gemini CLI Configuration Script for XCodeCLI"
    Write-Host "======================================================="
    Write-Host ""

    # Handle command line arguments
    if ($Help) {
        Show-Help
    }

    if ($Show) {
        Show-Settings
        exit 0
    }

    # Interactive mode if no API key provided
    if ([string]::IsNullOrWhiteSpace($ApiKey)) {
        Write-Info "Interactive setup mode"
        Write-Host ""

        # Get API key
        while ([string]::IsNullOrWhiteSpace($ApiKey)) {
            $ApiKey = Read-Host "Enter your API key"
            if ([string]::IsNullOrWhiteSpace($ApiKey)) {
                Write-Warning "API key is required"
            } elseif (-not (Test-ApiKey $ApiKey)) {
                $ApiKey = ""
            }
        }
    }

    # Validate inputs
    if ([string]::IsNullOrWhiteSpace($ApiKey)) {
        Write-Error "API key is required"
        Write-Info "Use -Help for usage information"
        exit 1
    }

    # Validate API key
    if (-not (Test-ApiKey $ApiKey)) {
        exit 1
    }

    $maskedKey = if ($ApiKey.Length -gt 12) {
        "$($ApiKey.Substring(0, 8))...$($ApiKey.Substring($ApiKey.Length - 4))"
    } else {
        "$($ApiKey.Substring(0, [Math]::Min(4, $ApiKey.Length)))..."
    }
    Write-Info "API Key: $maskedKey"
    Write-Host ""

    # Test API connection and get working base URL
    $BaseUrl = Test-ApiConnection -ApiKey $ApiKey

    if (-not $BaseUrl) {
        if ($Test) {
            exit 1
        }

        $continue = Read-Host "All API tests failed. Continue anyway? (y/N)"
        if ($continue -notmatch '^[Yy]$') {
            Write-Info "Setup cancelled"
            exit 1
        }

        # If user chooses to continue anyway, use default URL
        $BaseUrl = $DefaultBaseUrl
        Write-Warning "Using default URL: $BaseUrl"
    } else {
        Write-Info "Selected working base URL: $BaseUrl"
    }

    # Exit if test only
    if ($Test) {
        Write-Success "API test completed successfully"
        exit 0
    }

    # Create settings directory
    New-SettingsDirectory

    # Backup existing settings
    Backup-Settings

    # Create new settings
    if (New-Settings -BaseUrl $BaseUrl -ApiKey $ApiKey) {
        Write-Host ""
        Write-Success "Gemini CLI has been configured successfully!"
        Write-Info "You can now use Gemini CLI with your API router."
        Write-Info ""
        Write-Info "To verify the setup, run:"
        Write-Info "  gemini --version"
        Write-Info ""
        Write-Info "Configuration file location: $GeminiEnvFile"

        if (Test-Path $GeminiEnvFile) {
            Write-Host ""
            Write-Info "Current settings:"
            Get-Content $GeminiEnvFile
        }
    } else {
        Write-Error "Failed to create Gemini CLI settings"
        exit 1
    }
}

# Run main function
Main