#!/bin/bash

set -e

GITEA_SERVER="$1"
REPOSITORY="$2"
TOKEN="$3"
KEEP_COUNT="$4"
DRY_RUN="$5"

echo "開始清理舊版本，保留最新 $KEEP_COUNT 個版本"

# 獲取所有 releases 並按創建時間排序
RELEASES_JSON=$(curl -s "$GITEA_SERVER/api/v1/repos/$REPOSITORY/releases" \
  -H "Authorization: token $TOKEN" \
  -H "Accept: application/json")

# 檢查是否成功獲取 releases
if [ $? -ne 0 ] || [ -z "$RELEASES_JSON" ]; then
  echo "錯誤：無法獲取 releases 列表"
  exit 1
fi

# 計算總數量
TOTAL_COUNT=$(echo "$RELEASES_JSON" | jq 'length')
echo "目前總共有 $TOTAL_COUNT 個 releases"

# 如果總數量小於等於保留數量，則無需清理
if [ $TOTAL_COUNT -le $KEEP_COUNT ]; then
  echo "releases 數量 ($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 releases (跳過前 keep-count 個)
TO_DELETE=$(echo "$RELEASES_JSON" | jq -r ".[$KEEP_COUNT:] | .[] | {id: .id, tag: .tag_name, name: .name}")

# 初始化刪除計數器和列表
DELETED_COUNT=0
DELETED_LIST="[]"

# 處理每個要刪除的 release
echo "$TO_DELETE" | jq -c '.' | while read -r release; do
  if [ -z "$release" ] || [ "$release" = "null" ]; then
    continue
  fi
  
  RELEASE_ID=$(echo "$release" | jq -r '.id')
  RELEASE_TAG=$(echo "$release" | jq -r '.tag')
  RELEASE_NAME=$(echo "$release" | jq -r '.name')
  
  if [ -z "$RELEASE_ID" ] || [ "$RELEASE_ID" = "null" ]; then
    continue
  fi
  
  echo "準備刪除: ID=$RELEASE_ID, Tag=$RELEASE_TAG, Name=$RELEASE_NAME"
  
  if [ "$DRY_RUN" = "true" ]; then
    echo "🔍 [模擬執行] 會刪除 release: $RELEASE_TAG ($RELEASE_NAME)"
    DELETED_COUNT=$((DELETED_COUNT + 1))
  else
    # 實際刪除
    DELETE_RESPONSE=$(curl -s -w "HTTP_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 release: $RELEASE_TAG ($RELEASE_NAME)"
      DELETED_COUNT=$((DELETED_COUNT + 1))
      
      # 更新已刪除列表
      DELETED_LIST=$(echo "$DELETED_LIST" | jq ". + [{\"id\": \"$RELEASE_ID\", \"tag\": \"$RELEASE_TAG\", \"name\": \"$RELEASE_NAME\"}]")
    else
      echo "❌ 刪除失敗 release: $RELEASE_TAG ($RELEASE_NAME), HTTP狀態: $HTTP_STATUS"
    fi
  fi
done

# 由於 while 迴圈在子 shell 中執行，需要重新計算
if [ "$DRY_RUN" = "true" ]; then
  FINAL_DELETE_COUNT=$(echo "$TO_DELETE" | jq -s 'length')
  echo "🔍 [模擬執行] 總共會刪除 $FINAL_DELETE_COUNT 個版本"
else
  # 重新獲取並計算實際刪除的數量
  NEW_RELEASES_JSON=$(curl -s "$GITEA_SERVER/api/v1/repos/$REPOSITORY/releases" \
    -H "Authorization: token $TOKEN" \
    -H "Accept: application/json")
  NEW_TOTAL_COUNT=$(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"
fi