package workflows

import (
	"context"
	"errors"
	"testing"
)

func TestStubRunnerDiagnoseReturnsTypedNotImplemented(t *testing.T) {
	runner := NewStubRunner()

	_, err := runner.DiagnoseJobSeeker(context.Background(), DiagnosticInput{
		UserID:     "user-1",
		Track:      "backend-developer",
		TargetRole: "junior-backend-developer",
	})

	if !errors.Is(err, ErrNotImplemented) {
		t.Fatalf("err = %v, want %v", err, ErrNotImplemented)
	}
}

func TestStubRunnerGradesAnswer(t *testing.T) {
	runner := NewStubRunner()

	grade, err := runner.GradeInterviewAnswer(context.Background(), GradeAnswerInput{
		UserID:     "user-1",
		QuestionID: "q-1",
		AnswerID:   "a-1",
		AnswerText: "Indexes can speed reads by helping the database find rows, but they add write overhead.",
		Concepts: []ConceptRef{
			{ID: "database-indexes", Label: "Database indexes", Track: "backend-developer"},
		},
	})
	if err != nil {
		t.Fatalf("GradeInterviewAnswer error: %v", err)
	}
	if grade.AnswerID != "a-1" {
		t.Fatalf("AnswerID = %q", grade.AnswerID)
	}
	if grade.UserID != "user-1" {
		t.Fatalf("UserID = %q", grade.UserID)
	}
	if len(grade.Concepts) != 1 {
		t.Fatalf("concepts = %d, want 1", len(grade.Concepts))
	}
	if len(grade.Evidence) != 1 {
		t.Fatalf("evidence = %d, want 1", len(grade.Evidence))
	}
}

func TestStubRunnerExtractsLearningMemory(t *testing.T) {
	runner := NewStubRunner()
	grade := GradedAnswer{
		UserID:     "user-1",
		AnswerID:   "a-1",
		QuestionID: "q-1",
		Concepts: []ConceptRef{
			{ID: "cache-invalidation", Label: "Cache invalidation", Track: "backend-developer"},
		},
		Overall: AnswerPartial,
		Evidence: []EvidenceRef{
			{Kind: EvidenceAnswer, ID: "a-1", Confidence: 1},
		},
		FollowUp: FollowUpRecommendation{
			Needed:   true,
			Question: "Can you explain the tradeoff?",
			Purpose:  FollowUpRepair,
		},
	}

	candidate, err := runner.ExtractLearningMemory(context.Background(), grade)
	if err != nil {
		t.Fatalf("ExtractLearningMemory error: %v", err)
	}
	if candidate.UserID != "user-1" {
		t.Fatalf("UserID = %q", candidate.UserID)
	}
	if len(candidate.Updates) != 4 {
		t.Fatalf("updates = %d, want 4", len(candidate.Updates))
	}
	for _, update := range candidate.Updates {
		if len(update.Evidence) == 0 {
			t.Fatal("expected every memory update to carry evidence")
		}
	}
}