package models

import (
	"gorm.io/gorm"
	"time"
)

// KnowledgeBase 知识库模型
type KnowledgeBase struct {
	ID          uint       `gorm:"primaryKey;autoIncrement" json:"id"`
	TenantID    uint       `gorm:"not null;index;comment:租户 ID" json:"tenant_id"`
	Name        string     `gorm:"size:200;not null;comment:知识库名称" json:"name"`
	Slug        string     `gorm:"unique;size:100;not null;comment:知识库唯一标识" json:"slug"`
	Description *string    `gorm:"type:text;comment:知识库描述" json:"description"`
	Icon        *string    `gorm:"size:100;comment:图标" json:"icon"`
	SortOrder   int        `gorm:"default:0;comment:排序" json:"sort_order"`
	Status      string     `gorm:"default:'draft';comment:状态 (draft/published/archived)" json:"status"`
	CreatedAt   time.Time  `json:"created_at"`
	UpdatedAt   time.Time  `json:"updated_at"`
	DeletedAt   gorm.DeletedAt `gorm:"index" json:"deleted_at"`

	// 关联
	Tenant        *Tenant            `gorm:"foreignKey:TenantID" json:"tenant,omitempty"`
	KnowledgeItems []KnowledgeItem   `gorm:"foreignKey:KnowledgeBaseID" json:"items,omitempty"`
}

// TableName 指定表名
func (KnowledgeBase) TableName() string {
	return "knowledge_bases"
}

// KnowledgeItem 知识库条目模型
type KnowledgeItem struct {
	ID             uint           `gorm:"primaryKey;autoIncrement" json:"id"`
	TenantID       uint           `gorm:"not null;index;comment:租户 ID" json:"tenant_id"`
	KnowledgeBaseID uint          `gorm:"not null;index;comment:知识库 ID" json:"knowledge_base_id"`
	Title          string         `gorm:"size:500;not null;comment:标题" json:"title"`
	Slug           string         `gorm:"size:200;not null;comment:唯一标识" json:"slug"`
	Content        string         `gorm:"type:longtext;not null;comment:内容 (Markdown)" json:"content"`
	Summary        *string        `gorm:"type:text;comment:摘要" json:"summary"`
	Tags           *string        `gorm:"type:json;comment:标签 (JSON)" json:"tags"`
	Metadata       *string        `gorm:"type:text;comment:元数据 (JSON)" json:"metadata"`
	AuthorID       *uint          `gorm:"comment:作者 ID" json:"author_id"`
	Status         string         `gorm:"default:'draft';index;comment:状态 (draft/review/published/archived)" json:"status"`
	Views          int            `gorm:"default:0;comment:浏览次数" json:"views"`
	CreatedAt      time.Time      `json:"created_at"`
	UpdatedAt      time.Time      `json:"updated_at"`
	DeletedAt      gorm.DeletedAt `gorm:"index" json:"deleted_at"`

	// 关联
	Tenant        *Tenant        `gorm:"foreignKey:TenantID" json:"tenant,omitempty"`
	Author        *User          `gorm:"foreignKey:AuthorID" json:"author,omitempty"`
	KnowledgeBase *KnowledgeBase `gorm:"foreignKey:KnowledgeBaseID" json:"knowledge_base,omitempty"`
}

// TableName 指定表名
func (KnowledgeItem) TableName() string {
	return "knowledge_items"
}

// KnowledgeCategory 知识库分类
type KnowledgeCategory struct {
	ID          uint       `gorm:"primaryKey;autoIncrement" json:"id"`
	KnowledgeBaseID uint   `gorm:"not null;index" json:"knowledge_base_id"`
	ParentID    *uint      `gorm:"index" json:"parent_id"`
	Name        string     `gorm:"size:200;not null" json:"name"`
	Slug        string     `gorm:"size:100;not null" json:"slug"`
	Description *string    `gorm:"type:text" json:"description"`
	Icon        *string    `gorm:"size:100" json:"icon"`
	SortOrder   int        `gorm:"default:0" json:"sort_order"`
	Status      string     `gorm:"default:'active'" json:"status"`
	CreatedAt   time.Time  `json:"created_at"`
	UpdatedAt   time.Time  `json:"updated_at"`
	DeletedAt   gorm.DeletedAt `gorm:"index" json:"deleted_at"`
}

// TableName 指定表名
func (KnowledgeCategory) TableName() string {
	return "knowledge_categories"
}

// 知识库状态枚举
const (
	KBStatusDraft     = "draft"
	KBStatusPublished = "published"
	KBStatusArchived  = "archived"
)

// 知识库条目状态枚举
const (
	KnowledgeStatusDraft   = "draft"
	KnowledgeStatusReview  = "review"
	KnowledgeStatusPublished = "published"
	KnowledgeStatusArchived = "archived"
)

// KnowledgeSearchResult 知识库搜索结果
type KnowledgeSearchResult struct {
	Item      KnowledgeItem `json:"item"`
	Score     float64       `json:"score"`        // 相关度得分
	Matched   string        `json:"matched"`      // 匹配的文本片段
	Category  string        `json:"category"`     // 分类
}