name: Update Nix Packages with nix-update

on:
  schedule:
    - cron: "0 2 * * *"
  workflow_dispatch: # Allow manual triggering
    inputs:
      package:
        description: "Specific package to update (optional)"
        required: false
        type: string

env:
  GIT_AUTHOR_NAME: "nix-update bot"
  GIT_AUTHOR_EMAIL: "bot@m3ta.dev"
  GIT_COMMITTER_NAME: "nix-update bot"
  GIT_COMMITTER_EMAIL: "bot@m3ta.dev"
  GIT_TERMINAL_PROMPT: "0"
  GIT_ASKPASS: "/bin/echo"

jobs:
  nix-update:
    runs-on: nixos
    steps:
      - name: Checkout repository
        run: |
          # Clean up any previous runs
          if [ -d "/tmp/nixpkgs" ]; then
            rm -rf /tmp/nixpkgs
          fi

          # 1. Configure Credentials Globally using a Credential Helper Script
          # This is the most robust way to handle auth without leaking tokens in `ps` output
          # and ensuring it works for all git commands (clone, push, submodules)
          
          # Create a dummy askpass script that returns the password (token)
          echo 'echo "${{ secrets.NIX_UPDATE_TOKEN }}"' > /tmp/git-askpass-helper.sh
          chmod +x /tmp/git-askpass-helper.sh
          export GIT_ASKPASS="/tmp/git-askpass-helper.sh"

          # Clone using the username 'm3tam3re' explicitly.
          # Gitea PATs usually require the username to match the token owner for write operations.
          git clone --no-single-branch \
            "https://m3tam3re@code.m3ta.dev/m3tam3re/nixpkgs.git" \
            /tmp/nixpkgs

          cd /tmp/nixpkgs
          
          # Configure local git user
          git config user.name "${{ env.GIT_AUTHOR_NAME }}"
          git config user.email "${{ env.GIT_AUTHOR_EMAIL }}"
          git config init.defaultBranch master

          # Verify checkout
          git status
          git log --oneline -5

      - name: Check for available packages to update
        id: check-packages
        run: |
          cd /tmp/nixpkgs
          if [ -d "pkgs" ]; then
             echo "Packages found."
          else
             echo "pkgs directory not found"
             exit 1
          fi

          # Check if flake.nix exists
          if [ -f "flake.nix" ]; then
            echo "has_flake=true" >> $GITHUB_OUTPUT
          else
            echo "has_flake=false" >> $GITHUB_OUTPUT
          fi

      - name: Update packages
        id: update
        run: |
          cd /tmp/nixpkgs
          set -e

          TIMESTAMP=$(date +%Y%m%d-%H%M%S)
          BRANCH_NAME="nix-update-${TIMESTAMP}"

          git checkout -b "${BRANCH_NAME}"

          UPDATES_FOUND=false
          UPDATED_PACKAGES=""

          check_commit() {
             local pkg=$1
             local before=$2
             local after=$(git rev-parse HEAD)
             if [ "$before" != "$after" ]; then
                echo "true"
             else
                echo "false"
             fi
          }

          if [ -n "${{ inputs.package }}" ]; then
            echo "Updating specific package: ${{ inputs.package }}"
            if [ -d "pkgs/${{ inputs.package }}" ]; then
              BEFORE_HASH=$(git rev-parse HEAD)
              if nix-update --flake --commit "${{ inputs.package }}" 2>&1 | tee /tmp/update.log; then
                 if [ "$(check_commit "${{ inputs.package }}" "$BEFORE_HASH")" = "true" ]; then
                    UPDATES_FOUND=true
                    UPDATED_PACKAGES="${{ inputs.package }}"
                    echo "✓ Updated ${{ inputs.package }}"
                 fi
              fi
            else
              echo "✗ Package directory pkgs/${{ inputs.package }} not found"
            fi
          else
            echo "Checking all packages..."
            PACKAGES=$(find pkgs -mindepth 1 -maxdepth 1 -type d -not -name default.nix -not -name AGENTS.md -exec basename {} \; 2>/dev/null | sort)
            
            if [ -z "$PACKAGES" ]; then
              echo "No packages found to update"
              echo "has_updates=false" >> $GITHUB_OUTPUT
              exit 0
            fi

            for pkg in $PACKAGES; do
              echo "Checking $pkg..."
              BEFORE_HASH=$(git rev-parse HEAD)
              if nix-update --flake --commit "$pkg" 2>&1 | tee /tmp/update-${pkg}.log; then
                if [ "$(check_commit "$pkg" "$BEFORE_HASH")" = "true" ]; then
                   UPDATES_FOUND=true
                   UPDATED_PACKAGES="${UPDATED_PACKAGES}, $pkg"
                   echo "✓ Updated $pkg"
                fi
              fi
            done
          fi

          UPDATED_PACKAGES=$(echo "$UPDATED_PACKAGES" | sed 's/^, //')
          COMMIT_COUNT=$(git rev-list --count master..HEAD)
          
          if [ "$COMMIT_COUNT" -gt 0 ]; then
            echo "✓ $COMMIT_COUNT updates committed"
            echo "has_updates=true" >> $GITHUB_OUTPUT
            echo "updated_packages=${UPDATED_PACKAGES}" >> $GITHUB_OUTPUT
            echo "branch_name=${BRANCH_NAME}" >> $GITHUB_OUTPUT
          else
            echo "ℹ️ No package updates found"
            echo "has_updates=false" >> $GITHUB_OUTPUT
            git checkout master
            git branch -D "${BRANCH_NAME}" 2>/dev/null || true
          fi

      - name: Verify packages build
        if: steps.update.outputs.has_updates == 'true'
        run: |
          cd /tmp/nixpkgs
          PACKAGES="${{ steps.update.outputs.updated_packages }}"
          IFS=', ' read -ra PKG_ARRAY <<< "$PACKAGES"
          for pkg in "${PKG_ARRAY[@]}"; do
            echo "Building $pkg..."
            if ! nix build .#$pkg; then
              echo "❌ Build failed for $pkg"
              exit 1
            fi
          done

      - name: Push branch and create pull request
        if: steps.update.outputs.has_updates == 'true'
        run: |
          cd /tmp/nixpkgs
          BRANCH="${{ steps.update.outputs.branch_name }}"
          PACKAGES="${{ steps.update.outputs.updated_packages }}"

          # Re-export the helper for this step just in case
          export GIT_ASKPASS="/tmp/git-askpass-helper.sh"

          echo "Pushing branch ${BRANCH}..."
          git push origin "${BRANCH}"

          echo "Creating pull request..."
          
          if ! command -v tea &> /dev/null; then
             echo "Error: tea not found"
             exit 1
          fi

          # Reset tea login
          tea login delete m3ta >/dev/null 2>&1 || true
          tea login add --name m3ta --url https://code.m3ta.dev --token "${{ secrets.NIX_UPDATE_TOKEN }}"

          COMMITS=$(git log origin/master..HEAD --pretty=format:"%h %s" | sed 's/^/- /')

          tea pr create \
            --head "${BRANCH}" \
            --base master \
            --title "chore: update packages with nix-update" \
            --body "$(printf "Automated package updates using nix-update.\n\nUpdated packages:\n%s\n\nCommits:\n%s" "$PACKAGES" "$COMMITS")" \
            --assignees m3tam3re \
            --labels automated-update || echo "PR creation failed"

          # Cleanup
          rm -f /tmp/git-askpass-helper.sh

      - name: Summary
        if: always()
        run: |
          if [ "${{ steps.update.outputs.has_updates }}" = "true" ]; then
            echo "✅ Success: ${{ steps.update.outputs.updated_packages }}"
          else
            echo "ℹ️ No updates"
          fi