package learnermemory

import (
	"testing"

	"tutor/internal/workflows"
)

func TestApplyCandidateIgnoresUpdatesWithoutEvidence(t *testing.T) {
	service := NewService(NewMemoryStore())
	if _, err := service.EnsureProfile(ProfileInput{
		UserID:     "user-1",
		TargetRole: "junior backend developer",
		Stack:      []string{"go"},
	}); err != nil {
		t.Fatalf("EnsureProfile error: %v", err)
	}

	err := service.ApplyCandidate(workflows.MemoryUpdateCandidate{
		UserID: "user-1",
		Updates: []workflows.MemoryUpdate{
			{
				Kind:          workflows.MemoryConceptMastery,
				Concept:       workflows.ConceptRef{ID: "http-idempotency", Label: "HTTP idempotency"},
				ProposedState: workflows.ReadinessImproving,
				Summary:       "No evidence should not persist.",
			},
		},
	})
	if err != nil {
		t.Fatalf("ApplyCandidate error: %v", err)
	}

	snapshot, err := service.Snapshot("user-1")
	if err != nil {
		t.Fatalf("Snapshot error: %v", err)
	}
	if len(snapshot.Mastery) != 0 {
		t.Fatalf("mastery entries = %d, want 0", len(snapshot.Mastery))
	}
}

func TestApplyCandidateStoresEvidenceBackedMemory(t *testing.T) {
	service := NewService(NewMemoryStore())
	if _, err := service.EnsureProfile(ProfileInput{
		UserID:     "user-1",
		TargetRole: "junior backend developer",
		Stack:      []string{"go"},
	}); err != nil {
		t.Fatalf("EnsureProfile error: %v", err)
	}

	evidence := []workflows.EvidenceRef{{Kind: workflows.EvidenceAnswer, ID: "answer-1", Confidence: 1}}
	err := service.ApplyCandidate(workflows.MemoryUpdateCandidate{
		UserID: "user-1",
		Updates: []workflows.MemoryUpdate{
			{
				Kind:          workflows.MemoryConceptMastery,
				Concept:       workflows.ConceptRef{ID: "http-idempotency", Label: "HTTP idempotency"},
				ProposedState: workflows.ReadinessInterviewReady,
				Summary:       "Evidence-backed concept mastery.",
				Evidence:      evidence,
				Confidence:    0.8,
			},
			{
				Kind:       workflows.MemoryReviewSchedule,
				Concept:    workflows.ConceptRef{ID: "http-idempotency", Label: "HTTP idempotency"},
				Summary:    "Review later.",
				Evidence:   evidence,
				Confidence: 0.7,
			},
		},
	})
	if err != nil {
		t.Fatalf("ApplyCandidate error: %v", err)
	}

	snapshot, err := service.Snapshot("user-1")
	if err != nil {
		t.Fatalf("Snapshot error: %v", err)
	}
	if len(snapshot.Mastery) != 1 {
		t.Fatalf("mastery entries = %d, want 1", len(snapshot.Mastery))
	}
	if len(snapshot.ReviewSchedule) != 1 {
		t.Fatalf("review entries = %d, want 1", len(snapshot.ReviewSchedule))
	}
	if len(snapshot.Mastery[0].Evidence) != 1 {
		t.Fatal("expected mastery evidence")
	}
}