package types

import (
	"time"

	"github.com/google/uuid"
)

type EvidenceLevel string

const (
	EvidenceHypothesis EvidenceLevel = "hypothesis"
	EvidenceObserved    EvidenceLevel = "observed"
	EvidenceVerified   EvidenceLevel = "verified"
)

type LearningStatus string

const (
	StatusProvisional LearningStatus = "provisional"
	StatusVerified    LearningStatus = "verified"
	StatusDeprecated  LearningStatus = "deprecated"
)

type LearningPriority string

const (
	PriorityLow      LearningPriority = "low"
	PriorityMedium   LearningPriority = "medium"
	PriorityHigh     LearningPriority = "high"
	PriorityCritical LearningPriority = "critical"
)

type Learning struct {
	ID               uuid.UUID       `json:"id"`
	Summary          string          `json:"summary"`
	Details          string          `json:"details"`
	Category         string          `json:"category"`
	Area             string          `json:"area"`
	Status           LearningStatus  `json:"status"`
	Priority         LearningPriority `json:"priority"`
	Confidence       EvidenceLevel   `json:"confidence"`
	ActionRequired   bool            `json:"action_required"`
	
	// Provenance
	SourceType       string          `json:"source_type"`
	SourceRef        string          `json:"source_ref"`
	
	// Relations
	ProjectID        *uuid.UUID     `json:"project_id,omitempty"`
	RelatedThoughtID *uuid.UUID      `json:"related_thought_id,omitempty"`
	RelatedSkillID   *uuid.UUID      `json:"related_skill_id,omitempty"`
	
	// Versioning/Review
	ReviewedBy       *string         `json:"reviewed_by,omitempty"`
	ReviewedAt       *time.Time      `json:"reviewed_at,omitempty"`
	DuplicateOf      *uuid.UUID      `json:"duplicate_of,omitempty"`
	Supersedes       *uuid.UUID      `json:"supersedes,omitempty"`
	
	Tags             []string        `json:"tags"`
	CreatedAt        time.Time       `json:"created_at"`
	UpdatedAt        time.Time       `json:"updated_at"`
}

type LearningFilter struct {
	Limit       int
	ProjectID   *uuid.UUID
	Category    string
	Area        string
	Status      LearningStatus
	Priority    LearningPriority
	Tag         string
	Query       string // Free-text search across summary/details
}

type LearningSearchResult struct {
	Learning   Learning `json:"learning"`
	Similarity float64  `json:"similarity"`
}