// Filename: internal/service/log_service.go
package service

import (
	"gemini-balancer/internal/models"
	"strconv"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

type LogService struct {
	db *gorm.DB
}

func NewLogService(db *gorm.DB) *LogService {
	return &LogService{db: db}
}

func (s *LogService) Record(log *models.RequestLog) error {
	return s.db.Create(log).Error
}

func (s *LogService) GetLogs(c *gin.Context) ([]models.RequestLog, int64, error) {
	var logs []models.RequestLog
	var total int64

	query := s.db.Model(&models.RequestLog{}).Scopes(s.filtersScope(c))

	// 先计算总数
	if err := query.Count(&total).Error; err != nil {
		return nil, 0, err
	}
	if total == 0 {
		return []models.RequestLog{}, 0, nil
	}

	// 再执行分页查询
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
	offset := (page - 1) * pageSize

	err := query.Order("request_time desc").Limit(pageSize).Offset(offset).Find(&logs).Error
	if err != nil {
		return nil, 0, err
	}

	return logs, total, nil
}

func (s *LogService) filtersScope(c *gin.Context) func(db *gorm.DB) *gorm.DB {
	return func(db *gorm.DB) *gorm.DB {
		if modelName := c.Query("model_name"); modelName != "" {
			db = db.Where("model_name = ?", modelName)
		}
		if isSuccessStr := c.Query("is_success"); isSuccessStr != "" {
			if isSuccess, err := strconv.ParseBool(isSuccessStr); err == nil {
				db = db.Where("is_success = ?", isSuccess)
			}
		}
		if statusCodeStr := c.Query("status_code"); statusCodeStr != "" {
			if statusCode, err := strconv.Atoi(statusCodeStr); err == nil {
				db = db.Where("status_code = ?", statusCode)
			}
		}
		if keyIDStr := c.Query("key_id"); keyIDStr != "" {
			if keyID, err := strconv.ParseUint(keyIDStr, 10, 64); err == nil {
				db = db.Where("key_id = ?", keyID)
			}
		}
		if groupIDStr := c.Query("group_id"); groupIDStr != "" {
			if groupID, err := strconv.ParseUint(groupIDStr, 10, 64); err == nil {
				db = db.Where("group_id = ?", groupID)
			}
		}
		return db
	}
}