# OPC # 0004: One-time migration — make postgres-data and minio-data external volumes
# Run this ONCE before doing `docker compose up -d` with the updated docker-compose.yml.
# Safe to run while containers are stopped. Do NOT run while containers are running.
#
# Usage:
#   cd OPC/scripts
#   .\create-external-volumes.ps1

$ErrorActionPreference = "Stop"

function Migrate-Volume($composeName, $externalName) {
    Write-Host "`nMigrating: $composeName -> $externalName" -ForegroundColor Cyan

    $existing = docker volume ls --format "{{.Name}}" | Where-Object { $_ -eq $externalName }
    if ($existing) {
        Write-Host "  Volume '$externalName' already exists — skipping copy." -ForegroundColor Yellow
        return
    }

    # Check source exists
    $source = docker volume ls --format "{{.Name}}" | Where-Object { $_ -eq $composeName }
    if (-not $source) {
        Write-Host "  Source volume '$composeName' not found — creating empty external volume." -ForegroundColor Yellow
        docker volume create $externalName | Out-Null
        return
    }

    # Create external volume
    docker volume create $externalName | Out-Null
    Write-Host "  Created '$externalName'"

    # Copy data using a temporary alpine container
    docker run --rm `
        -v "${composeName}:/from" `
        -v "${externalName}:/to" `
        alpine sh -c "cd /from && cp -a . /to"
    Write-Host "  Data copied." -ForegroundColor Green
}

# The compose project name prefixes anonymous volumes as "clarity-platform_<name>"
Migrate-Volume "clarity-platform_postgres-data" "postgres-data"
Migrate-Volume "clarity-platform_minio-data"    "minio-data"

Write-Host "`nDone. You can now run: docker compose up -d" -ForegroundColor Green
Write-Host "The old 'clarity-platform_postgres-data' and 'clarity-platform_minio-data' volumes can be removed with 'docker volume rm' once you've verified everything is working."