name: 'Calculate Version'
description: '自動計算語義化版本號'
inputs:
  gitea-server:
    description: 'Gitea 伺服器 URL'
    required: true
  repository:
    description: '儲存庫名稱 (格式: owner/repo)'
    required: true
  token:
    description: 'Gitea API Token'
    required: true
  initial-version:
    description: '初始版本號'
    required: false
    default: '0.0.1'
  patch-limit:
    description: '小版號上限 (達到時進位中版號)'
    required: false
    default: '10'
  minor-limit:
    description: '中版號上限 (達到時進位大版號)'
    required: false
    default: '10'
outputs:
  version:
    description: '計算出的新版本號'
    value: ${{ steps.calculate.outputs.version }}
  previous-version:
    description: '上一個版本號'
    value: ${{ steps.calculate.outputs.previous-version }}
runs:
  using: 'composite'
  steps:
    - name: 計算版本號
      id: calculate
      shell: bash
      run: |
        # 獲取最新的 release tag
        LATEST_TAG=$(curl -s "${{ inputs.gitea-server }}/api/v1/repos/${{ inputs.repository }}/releases" \
          -H "Authorization: token ${{ inputs.token }}" \
          -H "Accept: application/json" | \
          jq -r 'if length > 0 then .[0].tag_name else "v0.0.0" end' | sed 's/^v//')
        
        # 如果沒有找到版本或版本為空，使用初始版本前一版
        if [ -z "$LATEST_TAG" ] || [ "$LATEST_TAG" = "null" ]; then
          # 解析初始版本並減1來設定基準
          IFS='.' read -r INIT_MAJOR INIT_MINOR INIT_PATCH <<< "${{ inputs.initial-version }}"
          if [ $INIT_PATCH -gt 0 ]; then
            LATEST_TAG="$INIT_MAJOR.$INIT_MINOR.$((INIT_PATCH - 1))"
          elif [ $INIT_MINOR -gt 0 ]; then
            LATEST_TAG="$INIT_MAJOR.$((INIT_MINOR - 1)).$((inputs.patch-limit - 1))"
          elif [ $INIT_MAJOR -gt 0 ]; then
            LATEST_TAG="$((INIT_MAJOR - 1)).$((inputs.minor-limit - 1)).$((inputs.patch-limit - 1))"
          else
            LATEST_TAG="0.0.0"
          fi
        fi
        
        echo "上一版本: $LATEST_TAG"
        echo "previous-version=$LATEST_TAG" >> $GITHUB_OUTPUT
        
        # 分解版本號
        IFS='.' read -r MAJOR MINOR PATCH <<< "$LATEST_TAG"
        
        # 確保變數為數字
        MAJOR=${MAJOR:-0}
        MINOR=${MINOR:-0}
        PATCH=${PATCH:-0}
        
        # 增加 patch 版本
        PATCH=$((PATCH + 1))
        
        # 如果 patch >= 上限，重置為 0 並增加 minor
        if [ $PATCH -ge ${{ inputs.patch-limit }} ]; then
          PATCH=0
          MINOR=$((MINOR + 1))
        fi
        
        # 如果 minor >= 上限，重置為 0 並增加 major
        if [ $MINOR -ge ${{ inputs.minor-limit }} ]; then
          MINOR=0
          MAJOR=$((MAJOR + 1))
        fi
        
        NEW_VERSION="$MAJOR.$MINOR.$PATCH"
        echo "新版本: $NEW_VERSION"
        echo "version=$NEW_VERSION" >> $GITHUB_OUTPUT