package entities

import (
	"errors"
	"fmt"
	"strings"
	"time"

	"github.com/google/uuid"
	"gorm.io/gorm"
)

// ProductDocumentation 产品文档实体
type ProductDocumentation struct {
	ID              string `gorm:"primaryKey;type:varchar(36)" comment:"文档ID"`
	ProductID       string `gorm:"type:varchar(36);not null;uniqueIndex" comment:"产品ID"`
	RequestURL      string `gorm:"type:varchar(500);not null" comment:"请求链接"`
	RequestMethod   string `gorm:"type:varchar(20);not null" comment:"请求方法"`
	BasicInfo       string `gorm:"type:text" comment:"基础说明(请求头配置、参数加密等)"`
	RequestParams   string `gorm:"type:text" comment:"请求参数"`
	ResponseFields  string `gorm:"type:text" comment:"返回字段说明"`
	ResponseExample string `gorm:"type:text" comment:"响应示例"`
	ErrorCodes      string `gorm:"type:text" comment:"错误代码"`
	Version         string `gorm:"type:varchar(20);default:'1.0'" comment:"文档版本"`

	// 关联关系
	Product *Product `gorm:"foreignKey:ProductID" comment:"产品"`

	CreatedAt time.Time      `gorm:"autoCreateTime" comment:"创建时间"`
	UpdatedAt time.Time      `gorm:"autoUpdateTime" comment:"更新时间"`
	DeletedAt gorm.DeletedAt `gorm:"index" comment:"软删除时间"`
}

// BeforeCreate GORM钩子：创建前自动生成UUID
func (pd *ProductDocumentation) BeforeCreate(tx *gorm.DB) error {
	if pd.ID == "" {
		pd.ID = uuid.New().String()
	}
	return nil
}

// IsValid 检查文档是否有效
func (pd *ProductDocumentation) IsValid() bool {
	return pd.DeletedAt.Time.IsZero()
}


// UpdateContent 更新文档内容
func (pd *ProductDocumentation) UpdateContent(requestURL, requestMethod, basicInfo, requestParams, responseFields, responseExample, errorCodes string) {
	pd.RequestURL = requestURL
	pd.RequestMethod = requestMethod
	pd.BasicInfo = basicInfo
	pd.RequestParams = requestParams
	pd.ResponseFields = responseFields
	pd.ResponseExample = responseExample
	pd.ErrorCodes = errorCodes
}

// IncrementVersion 增加版本号
func (pd *ProductDocumentation) IncrementVersion() {
	// 简单的版本号递增逻辑，实际项目中可能需要更复杂的版本管理
	if pd.Version == "" {
		pd.Version = "1.0"
	} else {
		// 这里可以实现更复杂的版本号递增逻辑
		pd.Version = pd.Version + ".1"
	}
}

// Validate 验证文档完整性
func (pd *ProductDocumentation) Validate() error {
	if pd.RequestURL == "" {
		return errors.New("请求链接不能为空")
	}
	if pd.RequestMethod == "" {
		return errors.New("请求方法不能为空")
	}
	if pd.ProductID == "" {
		return errors.New("产品ID不能为空")
	}

	// 验证请求方法
	validMethods := []string{"GET", "POST", "PUT", "DELETE", "PATCH", "HEAD", "OPTIONS"}
	methodValid := false
	for _, method := range validMethods {
		if strings.ToUpper(pd.RequestMethod) == method {
			methodValid = true
			break
		}
	}
	if !methodValid {
		return fmt.Errorf("无效的请求方法: %s", pd.RequestMethod)
	}

	// 验证URL格式（简单验证）
	if !strings.HasPrefix(pd.RequestURL, "http://") && !strings.HasPrefix(pd.RequestURL, "https://") {
		return errors.New("请求链接必须以http://或https://开头")
	}

	// 验证版本号格式
	if pd.Version != "" {
		if !isValidVersion(pd.Version) {
			return fmt.Errorf("无效的版本号格式: %s", pd.Version)
		}
	}

	return nil
}

// CanPublish 检查是否可以发布
func (pd *ProductDocumentation) CanPublish() error {
	if err := pd.Validate(); err != nil {
		return fmt.Errorf("文档验证失败: %w", err)
	}
	if pd.BasicInfo == "" {
		return errors.New("基础说明不能为空")
	}
	if pd.RequestParams == "" {
		return errors.New("请求参数不能为空")
	}
	return nil
}

// UpdateDocumentation 更新文档内容并自动递增版本
func (pd *ProductDocumentation) UpdateDocumentation(requestURL, requestMethod, basicInfo, requestParams, responseFields, responseExample, errorCodes string) error {
	// 验证必填字段
	if requestURL == "" || requestMethod == "" {
		return errors.New("请求链接和请求方法不能为空")
	}

	// 更新内容
	pd.UpdateContent(requestURL, requestMethod, basicInfo, requestParams, responseFields, responseExample, errorCodes)

	// 自动递增版本
	pd.IncrementVersion()

	return nil
}


// GetDocumentationSummary 获取文档摘要
func (pd *ProductDocumentation) GetDocumentationSummary() map[string]interface{} {
	return map[string]interface{}{
		"id":          pd.ID,
		"product_id":  pd.ProductID,
		"request_url": pd.RequestURL,
		"method":      pd.RequestMethod,
		"version":     pd.Version,
		"created_at":  pd.CreatedAt,
		"updated_at":  pd.UpdatedAt,
	}
}

// HasRequiredFields 检查是否包含必需字段
func (pd *ProductDocumentation) HasRequiredFields() bool {
	return pd.RequestURL != "" &&
		pd.RequestMethod != "" &&
		pd.ProductID != "" &&
		pd.BasicInfo != "" &&
		pd.RequestParams != ""
}

// IsComplete 检查文档是否完整
func (pd *ProductDocumentation) IsComplete() bool {
	return pd.HasRequiredFields() &&
		pd.ResponseFields != "" &&
		pd.ResponseExample != "" &&
		pd.ErrorCodes != ""
}

// GetCompletionPercentage 获取文档完成度百分比
func (pd *ProductDocumentation) GetCompletionPercentage() int {
	totalFields := 8 // 总字段数
	completedFields := 0

	if pd.RequestURL != "" {
		completedFields++
	}
	if pd.RequestMethod != "" {
		completedFields++
	}
	if pd.BasicInfo != "" {
		completedFields++
	}
	if pd.RequestParams != "" {
		completedFields++
	}
	if pd.ResponseFields != "" {
		completedFields++
	}
	if pd.ResponseExample != "" {
		completedFields++
	}
	if pd.ErrorCodes != "" {
		completedFields++
	}
	return (completedFields * 100) / totalFields
}

// isValidVersion 验证版本号格式
func isValidVersion(version string) bool {
	// 简单的版本号验证：x.y.z 格式
	parts := strings.Split(version, ".")
	if len(parts) < 1 || len(parts) > 3 {
		return false
	}

	for _, part := range parts {
		if part == "" {
			return false
		}
		// 检查是否为数字
		for _, char := range part {
			if char < '0' || char > '9' {
				return false
			}
		}
	}

	return true
}