# OpenCand Database Deployment Script (PowerShell)
# This script deploys the database schema changes to the PostgreSQL container

param(
    [string]$ContainerName = "opencand_db",
    [string]$DatabaseName = "opencand", 
    [string]$DatabaseUser = "root",
    [string]$SqlFile = ".\db\db.sql"
)

# Configuration
$ErrorActionPreference = "Stop"

Write-Host "🚀 OpenCand Database Deployment Script" -ForegroundColor Yellow
Write-Host "==================================" -ForegroundColor Yellow

try {
    # Check if Docker is running
    Write-Host "📋 Pre-deployment checks:" -ForegroundColor Yellow
    docker info | Out-Null
    Write-Host "✅ Docker is running" -ForegroundColor Green

    # Check if the database container is running
    $runningContainers = docker ps --format "{{.Names}}"
    if ($runningContainers -notcontains $ContainerName) {
        throw "Database container '$ContainerName' is not running. Please start with: docker-compose up -d"
    }
    Write-Host "✅ Database container is running" -ForegroundColor Green

    # Check if SQL file exists
    if (-not (Test-Path $SqlFile)) {
        throw "SQL file '$SqlFile' not found"
    }
    Write-Host "✅ SQL file exists" -ForegroundColor Green
    Write-Host ""

    # Wait for database to be ready
    Write-Host "⏳ Waiting for database to be ready..." -ForegroundColor Yellow
    $timeout = 30
    $counter = 0
    do {
        $ready = $false
        try {
            docker exec $ContainerName pg_isready -U $DatabaseUser -d $DatabaseName | Out-Null
            $ready = $true
        }
        catch {
            Start-Sleep -Seconds 1
            $counter++
            if ($counter -ge $timeout) {
                throw "Database failed to become ready within $timeout seconds"
            }
        }
    } while (-not $ready)
    
    Write-Host "✅ Database is ready" -ForegroundColor Green
    Write-Host ""

    # Create backup before deployment
    Write-Host "💾 Creating database backup..." -ForegroundColor Yellow
    $backupFile = "backup_$(Get-Date -Format 'yyyyMMdd_HHmmss').sql"
    docker exec $ContainerName pg_dump -U $DatabaseUser -d $DatabaseName | Out-File -FilePath $backupFile -Encoding UTF8
    Write-Host "✅ Backup created: $backupFile" -ForegroundColor Green
    Write-Host ""

    # Deploy the SQL file
    Write-Host "🔧 Deploying database changes..." -ForegroundColor Yellow
    Write-Host "Executing: $SqlFile"

    # Execute the SQL file
    Get-Content $SqlFile | docker exec -i $ContainerName psql -U $DatabaseUser -d $DatabaseName
    
    Write-Host "✅ Database deployment completed successfully!" -ForegroundColor Green
    Write-Host ""
    
    # Show table information
    Write-Host "📊 Current database tables:" -ForegroundColor Yellow
    docker exec $ContainerName psql -U $DatabaseUser -d $DatabaseName -c "\dt"
    
    Write-Host ""
    Write-Host "🎉 Deployment completed successfully!" -ForegroundColor Green
    Write-Host "==================================" -ForegroundColor Green

} catch {
    Write-Host "❌ Error: $($_.Exception.Message)" -ForegroundColor Red
    if (Test-Path $backupFile) {
        Write-Host "💡 You can restore from backup using:" -ForegroundColor Yellow
        Write-Host "Get-Content $backupFile | docker exec -i $ContainerName psql -U $DatabaseUser -d $DatabaseName" -ForegroundColor Yellow
    }
    exit 1
}