#!/bin/bash

set -euo pipefail

GITEA_SERVER="$1"
REPOSITORY="$2"
TOKEN="$3"
KEEP_COUNT="$4"
DRY_RUN="${5:-false}"

# 參數驗證
if [[ -z "$GITEA_SERVER" ]] || [[ -z "$REPOSITORY" ]] || [[ -z "$TOKEN" ]] || [[ -z "$KEEP_COUNT" ]]; then
  echo "❌ 錯誤：缺少必要參數"
  echo "使用方式: $0 <gitea-server> <repository> <token> <keep-count> [dry-run]"
  exit 1
fi

echo "開始清理舊版本，保留最新 $KEEP_COUNT 個版本"

# 獲取所有發佈並按創建時間排序
echo "正在獲取發佈列表..."
RELEASES_RESPONSE=$(curl -s -w "\nHTTP_STATUS:%{http_code}" \
  "$GITEA_SERVER/api/v1/repos/$REPOSITORY/releases" \
  -H "Authorization: token $TOKEN" \
  -H "Accept: application/json")

HTTP_STATUS=$(echo "$RELEASES_RESPONSE" | grep -o "HTTP_STATUS:[0-9]*" | cut -d: -f2)
RELEASES_JSON=$(echo "$RELEASES_RESPONSE" | sed '/HTTP_STATUS:/d')

# 檢查是否成功獲取發佈
if [[ "$HTTP_STATUS" != "200" ]] || [[ -z "$RELEASES_JSON" ]] || [[ "$RELEASES_JSON" == "null" ]]; then
  echo "❌ 錯誤：無法獲取發佈列表 (HTTP Status: $HTTP_STATUS)"
  exit 1
fi

# 計算總數量並排序（按創建時間降序，最新的在前）
SORTED_RELEASES=$(echo "$RELEASES_JSON" | jq -e 'sort_by(.created_at) | reverse')

if [[ $? -ne 0 ]]; then
  echo "❌ 錯誤：無法解析發佈資料"
  exit 1
fi

TOTAL_COUNT=$(echo "$SORTED_RELEASES" | jq 'length')
echo "目前總共有 $TOTAL_COUNT 個發佈"

# 如果總數量小於等於保留數量，則無需清理
if [[ $TOTAL_COUNT -le $KEEP_COUNT ]]; then
  echo "✅ 發佈數量 ($TOTAL_COUNT) 未超過保留數量 ($KEEP_COUNT)，無需清理"
  exit 0
fi

# 計算需要刪除的數量
DELETE_COUNT=$((TOTAL_COUNT - KEEP_COUNT))
echo "需要刪除 $DELETE_COUNT 個舊版本"

# 獲取要刪除的發佈（跳過前 keep-count 個）
TO_DELETE=$(echo "$SORTED_RELEASES" | jq -c ".[$KEEP_COUNT:]")

# 初始化刪除計數器
DELETED_COUNT=0
FAILED_COUNT=0

# 處理每個要刪除的發佈
echo "$TO_DELETE" | jq -c '.[]' | while IFS= read -r release; do
  if [[ -z "$release" ]] || [[ "$release" == "null" ]]; then
    continue
  fi
  
  RELEASE_ID=$(echo "$release" | jq -r '.id')
  RELEASE_TAG=$(echo "$release" | jq -r '.tag_name')
  RELEASE_NAME=$(echo "$release" | jq -r '.name // "未命名"')
  
  if [[ -z "$RELEASE_ID" ]] || [[ "$RELEASE_ID" == "null" ]]; then
    continue
  fi
  
  if [[ "$DRY_RUN" == "true" ]]; then
    echo "🔍 [模擬執行] 會刪除發佈: $RELEASE_TAG ($RELEASE_NAME)"
  else
    # 實際刪除
    DELETE_RESPONSE=$(curl -s -w "\nHTTP_STATUS:%{http_code}" \
      -X DELETE "$GITEA_SERVER/api/v1/repos/$REPOSITORY/releases/$RELEASE_ID" \
      -H "Authorization: token $TOKEN")
    
    HTTP_STATUS=$(echo "$DELETE_RESPONSE" | grep -o "HTTP_STATUS:[0-9]*" | cut -d: -f2)
    
    if [[ "$HTTP_STATUS" == "204" ]] || [[ "$HTTP_STATUS" == "200" ]]; then
      echo "✅ 成功刪除發佈: $RELEASE_TAG ($RELEASE_NAME)"
    else
      echo "❌ 刪除失敗發佈: $RELEASE_TAG ($RELEASE_NAME), HTTP 狀態: $HTTP_STATUS"
      FAILED_COUNT=$((FAILED_COUNT + 1))
    fi
  fi
done

# 檢查是否有刪除失敗的情況
if [[ $FAILED_COUNT -gt 0 ]]; then
  echo ""
  echo "❌ 錯誤：有 $FAILED_COUNT 個發佈刪除失敗"
  exit 1
fi

# 輸出最終結果
if [[ "$DRY_RUN" == "true" ]]; then
  echo ""
  echo "🔍 [模擬執行] 總共會刪除 $DELETE_COUNT 個版本"
  echo "✅ 模擬執行完成"
else
  # 重新獲取並計算實際刪除的數量
  echo ""
  echo "正在驗證刪除結果..."
  NEW_RELEASES_RESPONSE=$(curl -s -w "\nHTTP_STATUS:%{http_code}" \
    "$GITEA_SERVER/api/v1/repos/$REPOSITORY/releases" \
    -H "Authorization: token $TOKEN" \
    -H "Accept: application/json")
  
  NEW_HTTP_STATUS=$(echo "$NEW_RELEASES_RESPONSE" | grep -o "HTTP_STATUS:[0-9]*" | cut -d: -f2)
  NEW_RELEASES_JSON=$(echo "$NEW_RELEASES_RESPONSE" | sed '/HTTP_STATUS:/d')
  
  if [[ "$NEW_HTTP_STATUS" == "200" ]] && [[ -n "$NEW_RELEASES_JSON" ]]; then
    NEW_TOTAL_COUNT=$(echo "$NEW_RELEASES_JSON" | jq 'length')
    ACTUAL_DELETED=$((TOTAL_COUNT - NEW_TOTAL_COUNT))
    echo "✅ 清理完成！實際刪除了 $ACTUAL_DELETED 個版本"
    echo "📊 目前剩餘 $NEW_TOTAL_COUNT 個發佈"
  else
    echo "✅ 清理完成（無法驗證最終數量）"
  fi
fi