package service

import (
	"fmt"
	"strings"

	"github.com/QuantumNous/new-api/model"

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

// RecordOperation 便捷方法：记录操作日志。
func RecordOperation(c *gin.Context, action string, targetType string, targetId int, targetName string, content string, requestBody string) {
	userId := c.GetInt("id")
	if userId == 0 {
		return
	}
	sanitizedBody := model.SanitizeRequestBody(requestBody)
	model.RecordOperationLog(c, userId, action, targetType, targetId, targetName, content, sanitizedBody)
	// 设置标记，防止中间件重复记录同一操作
	c.Set("_operation_logged", true)
}

// RecordCreateOperation 记录创建操作。
func RecordCreateOperation(c *gin.Context, targetType string, targetId int, targetName string, content string, requestBody string) {
	RecordOperation(c, model.OperationActionCreate, targetType, targetId, targetName, content, requestBody)
}

// RecordUpdateOperation 记录更新操作。
func RecordUpdateOperation(c *gin.Context, targetType string, targetId int, targetName string, content string, requestBody string) {
	RecordOperation(c, model.OperationActionUpdate, targetType, targetId, targetName, content, requestBody)
}

// RecordDeleteOperation 记录删除操作。
func RecordDeleteOperation(c *gin.Context, targetType string, targetId int, targetName string, content string, requestBody string) {
	RecordOperation(c, model.OperationActionDelete, targetType, targetId, targetName, content, requestBody)
}

// FieldChange 表示单个字段的变更信息。
type FieldChange struct {
	Field    string // 字段中文名
	OldValue string // 变更前的值
	NewValue string // 变更后的值
}

// FormatUpdateDiff 将字段变更列表格式化为操作描述。
// 仅记录实际发生变化的字段，生成形如 "邮箱: old@a.com → new@b.com; 额度: 100 → 500" 的描述。
func FormatUpdateDiff(changes []FieldChange) string {
	if len(changes) == 0 {
		return ""
	}
	var parts []string
	for _, c := range changes {
		if c.OldValue == c.NewValue {
			continue
		}
		if c.OldValue == "" {
			parts = append(parts, fmt.Sprintf("%s: 设置为「%s」", c.Field, c.NewValue))
		} else if c.NewValue == "" {
			parts = append(parts, fmt.Sprintf("%s: 清空（原「%s」）", c.Field, c.OldValue))
		} else {
			parts = append(parts, fmt.Sprintf("%s: 「%s」→「%s」", c.Field, c.OldValue, c.NewValue))
		}
	}
	if len(parts) == 0 {
		return ""
	}
	return strings.Join(parts, "; ")
}

// RecordUpdateWithDiff 记录更新操作并附带字段级变更详情。
// baseContent 为基础描述（如 "更新用户: xxx"），changes 为变更字段列表。
func RecordUpdateWithDiff(c *gin.Context, targetType string, targetId int, targetName string, baseContent string, changes []FieldChange, requestBody string) {
	diffStr := FormatUpdateDiff(changes)
	if diffStr != "" {
		baseContent = baseContent + " | " + diffStr
	}
	RecordUpdateOperation(c, targetType, targetId, targetName, baseContent, requestBody)
}