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}
}

// Record 记录一条日志到数据库 (TODO 暂时保留简单实现，后续再重构为异步)
func (s *LogService) Record(log *models.RequestLog) error {
	return s.db.Create(log).Error
}

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

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

	// 简单的分页 ( TODO 后续可以做得更复杂)
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
	offset := (page - 1) * pageSize

	// 执行查询
	err := query.Limit(pageSize).Offset(offset).Find(&logs).Error
	if err != nil {
		return nil, err
	}

	return logs, 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)
			}
		}
		return db
	}
}