#!/bin/bash
# Validate current .env file against Azure deployment requirements
# Provides detailed analysis and recommendations

set -e

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
ENV_FILE="$PROJECT_ROOT/.env"

echo "╔══════════════════════════════════════════════════════════════╗"
echo "║   .ENV FILE ANALYSIS FOR AZURE DEPLOYMENTS                  ║"
echo "╚══════════════════════════════════════════════════════════════╝"
echo ""

if [ ! -f "$ENV_FILE" ]; then
  echo "❌ .env file not found at: $ENV_FILE"
  exit 1
fi

echo "📄 Analyzing: $ENV_FILE"
echo ""

# Load environment
set -a
source "$ENV_FILE"
set +a

# Check required variables
echo "✅ REQUIRED VARIABLES:"
echo ""

# Subscription ID
if [ -n "$AZURE_SUBSCRIPTION_ID" ] || [ -n "$ARM_SUBSCRIPTION_ID" ]; then
  SUB_ID="${AZURE_SUBSCRIPTION_ID:-$ARM_SUBSCRIPTION_ID}"
  echo "  ✓ Subscription ID: ${SUB_ID:0:8}...${SUB_ID: -4}"
  if [[ ! "$SUB_ID" =~ ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$ ]]; then
    echo "    ⚠️  Warning: Format may be invalid (should be UUID)"
  fi
else
  echo "  ❌ Subscription ID: MISSING"
fi

# Tenant ID
if [ -n "$AZURE_TENANT_ID" ] || [ -n "$ARM_TENANT_ID" ]; then
  TENANT_ID="${AZURE_TENANT_ID:-$ARM_TENANT_ID}"
  echo "  ✓ Tenant ID: ${TENANT_ID:0:8}...${TENANT_ID: -4}"
  if [[ ! "$TENANT_ID" =~ ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$ ]]; then
    echo "    ⚠️  Warning: Format may be invalid (should be UUID)"
  fi
else
  echo "  ❌ Tenant ID: MISSING"
fi

# Location
if [ -n "$AZURE_LOCATION" ] || [ -n "$ARM_LOCATION" ]; then
  LOCATION="${AZURE_LOCATION:-$ARM_LOCATION}"
  echo "  ✓ Location: $LOCATION"
  if [[ "$LOCATION" =~ ^us ]]; then
    echo "    ❌ ERROR: US regions are not allowed!"
  fi
else
  echo "  ⚠️  Location: NOT SET (will default to westeurope)"
fi

echo ""
echo "📋 OPTIONAL BUT RECOMMENDED:"
echo ""

# Management Group
if [ -n "$AZURE_MANAGEMENT_GROUP_ID" ]; then
  echo "  ✓ Management Group: $AZURE_MANAGEMENT_GROUP_ID"
else
  echo "  ○ Management Group: Not set"
fi

# Resource Group
if [ -n "$AZURE_RESOURCE_GROUP" ] || [ -n "$TF_VAR_resource_group_name" ]; then
  RG="${AZURE_RESOURCE_GROUP:-$TF_VAR_resource_group_name}"
  echo "  ✓ Resource Group: $RG"
else
  echo "  ⚠️  Resource Group: Not set (will use default naming convention)"
fi

# Environment
if [ -n "$TF_VAR_environment" ]; then
  echo "  ✓ Environment: $TF_VAR_environment"
else
  echo "  ⚠️  Environment: Not set (will default to 'dev')"
fi

# Storage Account
if [ -n "$TF_VAR_storage_account_name" ] || [ -n "$AZURE_STORAGE_ACCOUNT" ]; then
  SA="${TF_VAR_storage_account_name:-$AZURE_STORAGE_ACCOUNT}"
  echo "  ✓ Storage Account: $SA"
else
  echo "  ⚠️  Storage Account: Not set (will use default naming)"
fi

# Key Vault
if [ -n "$TF_VAR_key_vault_name" ] || [ -n "$AZURE_KEY_VAULT_NAME" ]; then
  KV="${TF_VAR_key_vault_name:-$AZURE_KEY_VAULT_NAME}"
  echo "  ✓ Key Vault: $KV"
else
  echo "  ⚠️  Key Vault: Not set (will use default naming)"
fi

echo ""
echo "🔧 TERRAFORM VARIABLE MAPPING:"
echo ""

# Check if variables need to be mapped
NEEDS_MAPPING=false

if [ -n "$AZURE_SUBSCRIPTION_ID" ] && [ -z "$ARM_SUBSCRIPTION_ID" ]; then
  echo "  ⚠️  AZURE_SUBSCRIPTION_ID found, but Terraform expects ARM_SUBSCRIPTION_ID"
  echo "     Recommendation: Add ARM_SUBSCRIPTION_ID=\"$AZURE_SUBSCRIPTION_ID\""
  NEEDS_MAPPING=true
fi

if [ -n "$AZURE_TENANT_ID" ] && [ -z "$ARM_TENANT_ID" ]; then
  echo "  ⚠️  AZURE_TENANT_ID found, but Terraform expects ARM_TENANT_ID"
  echo "     Recommendation: Add ARM_TENANT_ID=\"$AZURE_TENANT_ID\""
  NEEDS_MAPPING=true
fi

if [ -n "$AZURE_LOCATION" ] && [ -z "$ARM_LOCATION" ]; then
  echo "  ⚠️  AZURE_LOCATION found, but Terraform expects ARM_LOCATION"
  echo "     Recommendation: Add ARM_LOCATION=\"$AZURE_LOCATION\""
  NEEDS_MAPPING=true
fi

if [ "$NEEDS_MAPPING" = false ]; then
  echo "  ✓ All variables properly mapped for Terraform"
fi

echo ""
echo "📊 SUMMARY:"
echo ""

# Count issues
ISSUES=0
WARNINGS=0

if [ -z "$AZURE_SUBSCRIPTION_ID" ] && [ -z "$ARM_SUBSCRIPTION_ID" ]; then
  ISSUES=$((ISSUES + 1))
fi

if [ -z "$AZURE_TENANT_ID" ] && [ -z "$ARM_TENANT_ID" ]; then
  ISSUES=$((ISSUES + 1))
fi

if [ -z "$AZURE_LOCATION" ] && [ -z "$ARM_LOCATION" ]; then
  WARNINGS=$((WARNINGS + 1))
fi

if [ "$ISSUES" -eq 0 ] && [ "$WARNINGS" -eq 0 ]; then
  echo "  ✅ .env file is properly configured for Azure deployments"
elif [ "$ISSUES" -eq 0 ]; then
  echo "  ⚠️  .env file is mostly configured ($WARNINGS warning(s))"
else
  echo "  ❌ .env file has $ISSUES critical issue(s) and $WARNINGS warning(s)"
fi

echo ""
echo "💡 RECOMMENDATIONS:"
echo ""

if [ "$NEEDS_MAPPING" = true ]; then
  echo "  1. Add ARM_* variables for Terraform compatibility"
  echo "     (Our scripts will auto-map, but explicit is better)"
fi

if [ -z "$TF_VAR_environment" ]; then
  echo "  2. Add TF_VAR_environment=\"dev\" (or stage/prod)"
fi

if [ -z "$TF_VAR_resource_group_name" ] && [ -z "$AZURE_RESOURCE_GROUP" ]; then
  echo "  3. Consider setting TF_VAR_resource_group_name for custom naming"
fi

echo ""
echo "✅ Analysis complete!"
echo ""
echo "To use with Azure deployments:"
echo "  source infra/scripts/azure-validate-env.sh"
echo "  ./infra/scripts/azure-complete-setup.sh"