package model

import (
	"encoding/json"
	"time"
)

// Consultation 专家会诊单
type Consultation struct {
	ID             string          `gorm:"type:uuid;primaryKey;default:gen_random_uuid()" json:"id"`
	RoomID         *string         `gorm:"column:room_id;type:uuid;index" json:"roomId,omitempty"`
	BatchID        *string         `gorm:"column:batch_id;type:uuid;index" json:"batchId,omitempty"`
	LampTestID     *string         `gorm:"column:lamp_test_id;type:uuid;index" json:"lampTestId,omitempty"`
	Title          string          `gorm:"size:128" json:"title"`
	Summary        *string         `gorm:"type:text" json:"summary,omitempty"`
	Snapshot       json.RawMessage `gorm:"type:jsonb" json:"snapshot,omitempty"`
	Status         string          `gorm:"size:16;default:pending" json:"status"` // pending/consulting/resolved/archived
	ExpertID       *string         `gorm:"column:expert_id;type:uuid" json:"expertId,omitempty"`
	AssigneeID     *string         `gorm:"column:assignee_id;type:uuid" json:"assigneeId,omitempty"`
	AssignedAt     *time.Time      `gorm:"column:assigned_at;type:timestamptz" json:"assignedAt,omitempty"`
	AcceptedAt     *time.Time      `gorm:"column:accepted_at;type:timestamptz" json:"acceptedAt,omitempty"`
	NeedsInfoAt    *time.Time      `gorm:"column:needs_info_at;type:timestamptz" json:"needsInfoAt,omitempty"`
	SLADeadline    *time.Time      `gorm:"column:sla_deadline;type:timestamptz" json:"slaDeadline,omitempty"`
	OverdueAt      *time.Time      `gorm:"column:overdue_at;type:timestamptz" json:"overdueAt,omitempty"`
	LastSLAEventAt *time.Time      `gorm:"column:last_sla_event_at;type:timestamptz" json:"lastSlaEventAt,omitempty"`
	Opinion        *string         `gorm:"type:text" json:"opinion,omitempty"`
	Plan           *string         `gorm:"type:text" json:"plan,omitempty"`
	ResolvedAt     *time.Time      `gorm:"column:resolved_at;type:timestamptz" json:"resolvedAt,omitempty"`
	ArchivedAt     *time.Time      `gorm:"column:archived_at;type:timestamptz" json:"archivedAt,omitempty"`
	CreatedAt      time.Time       `gorm:"type:timestamptz" json:"createdAt"`
	UpdatedAt      time.Time       `gorm:"type:timestamptz" json:"updatedAt"`
	RoomName       *string         `gorm:"-" json:"roomName,omitempty"`
}

func (Consultation) TableName() string { return "consultations" }

// ValidConsultationTransition 状态流转规则：unassigned/assigned/accepted/needs_info/resolved/archived。
func ValidConsultationTransition(from, to string) bool {
	switch from {
	case "unassigned":
		return to == "assigned"
	case "assigned":
		return to == "accepted" || to == "needs_info"
	case "accepted":
		return to == "needs_info" || to == "resolved"
	case "needs_info":
		return to == "accepted" || to == "resolved"
	case "resolved":
		return to == "archived" || to == "needs_info"
	default:
		return false
	}
}

// ConsultationSLAState 返回会诊 SLA 状态；超时只标记，不自动伪造专家结论。
func ConsultationSLAState(t Consultation, now time.Time) string {
	if t.SLADeadline == nil {
		return "unscheduled"
	}
	if now.After(*t.SLADeadline) {
		return "overdue"
	}
	return "on_time"
}

// ConsultationSnapshot 病例快照（会诊时打包，避免引用数据变化）
type ConsultationSnapshot struct {
	RoomName      string            `json:"roomName,omitempty"`
	LampTest      *LampTest         `json:"lampTest,omitempty"`
	Inspection    *InspectionRecord `json:"inspection,omitempty"`
	Batch         *Batch            `json:"batch,omitempty"`
	WeatherAlerts []WeatherAlert    `json:"weatherAlerts,omitempty"`
	CreatedAt     time.Time         `json:"createdAt"`
}