name: Terraform Deploy
on:
    push:
        branches: [ master ]
        paths:
        - 'terraform/**'
    pull_request:
        branches: [ master ]
        paths:
        - 'terraform/**'
    workflow_dispatch:
        inputs:
            image_tag:
                description: 'Docker image tag to deploy'
                required: false
                default: 'latest'
                type: string
env:
    AWS_REGION: us-east-1
    TF_VAR_image_tag: us-east-1
    REPO_FULL_NAME: ${{ github.repository }}

jobs:
  terraform-plan:
    if: github.event_name == 'pull_request'
    runs-on: ubuntu-latest

    permissions:
      contents: read
      pull-requests: write
      id-token: write

    steps:
    - name: Checkout code
      uses: actions/checkout@v4

    - name: Extract repository name
      id: extract_short_name_repo
      run: |
        REPO_NAME="${REPO_FULL_NAME##*/}"
        echo "Repository Short name: $REPO_NAME"
        echo "REPO_NAME=$REPO_NAME" >> $GITHUB_OUTPUT

    - name: Set default image tag for PR
      id: pr-image-tag
      run: |
        # Use defaults if inputs are empty or not provided
        IMAGE_TAG="${{ inputs.image_tag }}"
        
        # Set to 'latest' if empty, null, or not provided
        if [ -z "$IMAGE_TAG" ] || [ "$IMAGE_TAG" = "null" ]; then
          IMAGE_TAG="latest"
        fi
        
        echo "image_tag=$IMAGE_TAG" >> $GITHUB_OUTPUT
        echo "Using image tag: $IMAGE_TAG"

    - name: Setup Terraform
      uses: hashicorp/setup-terraform@v3
      with:
        terraform_version: ~1.5

    - name: Configure AWS credentials
      uses: aws-actions/configure-aws-credentials@v4
      with:
        role-to-assume: arn:aws:iam::908027381725:role/${{ steps.extract_short_name_repo.outputs.REPO_NAME }}-github-actions-role
        aws-region: ${{ env.AWS_REGION }}

    - name: Configure Git for private modules
      run: |
        git config --global url."https://${{ secrets.GH_TOKEN }}@github.com/".insteadOf "https://github.com/"

    - name: Terraform Init
      working-directory: ./terraform
      run: terraform init

    - name: Terraform Validate
      working-directory: ./terraform
      run: terraform validate

    - name: Terraform Plan
      id: plan
      working-directory: ./terraform
      run: |
        terraform plan -input=false -lock=false -no-color -out=tfplan
        terraform show -no-color tfplan > plan_output.txt
      env:
        TF_VAR_image_tag: ${{ steps.pr-image-tag.outputs.image_tag }}

    - name: Update Pull Request
      uses: actions/github-script@v7
      with:
        script: |
          const fs = require('fs');
          const planOutput = fs.readFileSync('./terraform/plan_output.txt', 'utf8');
          const output = `## 🏗️ Terraform Plan for ${{ steps.extract_short_name_repo.outputs.REPO_SHORT_NAME }}
          <details>
          <summary>Click to expand plan</summary>
          \`\`\`hcl
          ${planOutput}
          \`\`\`
          </details>
          **Plan Status:** ${{ steps.plan.outcome }}
          **Service:** ${{ steps.extract_short_name_repo.outputs.REPO_SHORT_NAME }}.ggai:8000
          `;
          github.rest.issues.createComment({
            issue_number: context.issue.number,
            owner: context.repo.owner,
            repo: context.repo.repo,
            body: output
          });

  terraform-apply:
    if: github.ref == 'refs/heads/master' && (github.event_name == 'push' || github.event_name == 'workflow_dispatch')
    runs-on: ubuntu-latest

    permissions:
      contents: read
      id-token: write

    steps:
    - name: Checkout code
      uses: actions/checkout@v4
    
    - name: Extract repository name
      id: extract_short_name_repo
      run: |
        REPO_NAME="${REPO_FULL_NAME##*/}"
        echo "Repository Short name: $REPO_NAME"
        echo "REPO_NAME=$REPO_NAME" >> $GITHUB_OUTPUT

    - name: Configure AWS credentials
      uses: aws-actions/configure-aws-credentials@v4
      with:
        role-to-assume: arn:aws:iam::908027381725:role/${{ steps.extract_short_name_repo.outputs.REPO_NAME }}-github-actions-role
        aws-region: ${{ env.AWS_REGION }}

    - name: Determine image tag
      id: get-image-tag
      run: |
        if [ "${{ github.event_name }}" = "workflow_dispatch" ] && [ -n "${{ inputs.image_tag }}" ]; then
          # Priority 1: Manual input from workflow_dispatch (triggered by build workflow or manual)
          IMAGE_TAG="${{ inputs.image_tag }}"
          echo "source=manual" >> $GITHUB_OUTPUT
          echo "image_tag=${IMAGE_TAG}" >> $GITHUB_OUTPUT
          echo "Using provided image tag: ${IMAGE_TAG}"
        else
          # Priority 2: Direct terraform push (no application changes)
          # Check if commit contains application changes (non-terraform files)
          APP_CHANGES=$(git diff --name-only HEAD~1 HEAD | grep -v "^terraform/" | grep -v "^\.github/workflows/deploy\.yml" | wc -l)
          if [ "$APP_CHANGES" -gt 0 ]; then
            # Application changes detected but deploy workflow was triggered directly
            echo "⚠️ Application changes detected but no image tag provided!"
            echo "This deployment may fail because build workflow should have run first."
            echo "Attempting to get current image tag from ECS task definition..."
          fi
          # Get current image tag FE and BE from ECS task definition
          CURRENT_IMAGE=$(aws ecs describe-task-definition \
            --task-definition ${{ steps.extract_short_name_repo.outputs.REPO_NAME }}-prod-task-def \
            --query 'taskDefinition.containerDefinitions[0].image' \
            --output text 2>/dev/null || echo "")
          if [ -n "$CURRENT_IMAGE" ] && [[ "$CURRENT_IMAGE" != "None" ]]; then
            # Extract tag from image URL (format: 908027381725.dkr.ecr.us-east-1.amazonaws.com/${{ steps.extract_short_name_repo.outputs.REPO_NAME }}:TAG)
            IMAGE_TAG=$(echo "$CURRENT_IMAGE" | cut -d':' -f2)
            echo "source=current_ecs" >> $GITHUB_OUTPUT
            echo "image_tag=${IMAGE_TAG}" >> $GITHUB_OUTPUT
            echo "Using current ECS image tag: ${IMAGE_TAG} (extracted from task definition)"
          else
            # Fallback to latest if we can't get current task definition
            echo "Could not retrieve current task definition, falling back to 'latest'"
            IMAGE_TAG="latest"
            echo "source=fallback" >> $GITHUB_OUTPUT
            echo "image_tag=${IMAGE_TAG}" >> $GITHUB_OUTPUT
            echo "Using fallback image tag: ${IMAGE_TAG}"
          fi
        fi
    - name: Setup Terraform
      uses: hashicorp/setup-terraform@v3
      with:
        terraform_version: ~1.5

    - name: Configure Git for private modules
      run: |
        git config --global url."https://${{ secrets.GH_TOKEN }}@github.com/".insteadOf "https://github.com/"
    - name: Terraform Init
      working-directory: ./terraform
      run: terraform init

    - name: Terraform Validate
      working-directory: ./terraform
      run: terraform validate

    - name: Terraform Plan
      working-directory: ./terraform
      run: terraform plan -no-color
      env:
        TF_VAR_image_tag: ${{ steps.get-image-tag.outputs.image_tag }}

    - name: Terraform Apply
      working-directory: ./terraform
      run: terraform apply -auto-approve
      env:
        TF_VAR_image_tag: ${{ steps.get-image-tag.outputs.image_tag }}

    - name: Get deployment outputs
      id: terraform-output
      working-directory: ./terraform
      run: |
        SERVICE_URL=$(terraform output -raw service_discovery_endpoint 2>/dev/null || echo '${{ steps.extract_short_name_repo.outputs.REPO_NAME }}.ggai')
        ECR_REPO=$(terraform output -raw ecr_repository_url 2>/dev/null || echo 'N/A')
        delimiter=$(openssl rand -hex 8)
        echo "service_url<<${delimiter}" >> $GITHUB_OUTPUT
        echo "${SERVICE_URL}" >> $GITHUB_OUTPUT
        echo "${delimiter}" >> $GITHUB_OUTPUT
        echo "ecr_repository<<${delimiter}" >> $GITHUB_OUTPUT
        echo "${ECR_REPO}" >> $GITHUB_OUTPUT
        echo "${delimiter}" >> $GITHUB_OUTPUT

    - name: Create deployment summary
      run: |
        echo "## 🚀 ${{ steps.extract_short_name_repo.outputs.REPO_NAME }} Deployment Summary" >> $GITHUB_STEP_SUMMARY
        echo "| Component | Status |" >> $GITHUB_STEP_SUMMARY
        echo "|-----------|--------|" >> $GITHUB_STEP_SUMMARY
        echo "| **Terraform Init** | ✅ Success |" >> $GITHUB_STEP_SUMMARY
        echo "| **Terraform Validate** | ✅ Success |" >> $GITHUB_STEP_SUMMARY
        echo "| **Terraform Apply** | ✅ Success |" >> $GITHUB_STEP_SUMMARY
        echo "" >> $GITHUB_STEP_SUMMARY
        echo "### Service Information" >> $GITHUB_STEP_SUMMARY
        echo "- **Service URL**: ${{ steps.terraform-output.outputs.service_url }}" >> $GITHUB_STEP_SUMMARY
        echo "- **Container Port**: 3535" >> $GITHUB_STEP_SUMMARY
        echo "- **ECR Repository**: ${{ steps.terraform-output.outputs.ecr_repository }}" >> $GITHUB_STEP_SUMMARY
        echo "- **Image Tag**: \`${{ steps.get-image-tag.outputs.image_tag }}\`" >> $GITHUB_STEP_SUMMARY
        echo "- **Tag Source**: ${{ steps.get-image-tag.outputs.source }}" >> $GITHUB_STEP_SUMMARY
        echo "- **Trigger**: ${{ github.event_name }}" >> $GITHUB_STEP_SUMMARY
        echo "- **Deployment Time**: $(date)" >> $GITHUB_STEP_SUMMARY
        echo "" >> $GITHUB_STEP_SUMMARY
        # Add deployment trigger notice
        if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
          if [ "${{ steps.get-image-tag.outputs.source }}" = "manual" ]; then
            echo "### 🎯 Manual Deployment" >> $GITHUB_STEP_SUMMARY
            echo "This deployment was triggered manually with image tag: \`${{ steps.get-image-tag.outputs.image_tag }}\`" >> $GITHUB_STEP_SUMMARY
            echo "" >> $GITHUB_STEP_SUMMARY
          else
            echo "### 🤖 Build-Triggered Deployment" >> $GITHUB_STEP_SUMMARY
            echo "This deployment was triggered automatically by the build workflow with image tag: \`${{ steps.get-image-tag.outputs.image_tag }}\`" >> $GITHUB_STEP_SUMMARY
            echo "" >> $GITHUB_STEP_SUMMARY
          fi
        fi
        
        echo "### Next Steps" >> $GITHUB_STEP_SUMMARY
        echo "- Service will be available at \`${{ steps.extract_short_name_repo.outputs.REPO_NAME }}.ggai:8000\`" >> $GITHUB_STEP_SUMMARY
        echo "- Check ECS console for service health" >> $GITHUB_STEP_SUMMARY
        echo "- Monitor CloudWatch logs: \`/ecs/${{ steps.extract_short_name_repo.outputs.REPO_NAME }}\`" >> $GITHUB_STEP_SUMMARY