//go:build integration

package storage

import (
	"context"
	"database/sql"
	"testing"
	"time"

	"training-tracker/internal/models"
)

func TestSessionRepository_CRUD(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping integration test")
	}

	tdb := setupTestDB(t)
	defer tdb.cleanup(t)

	sessionRepo := NewSessionRepository(tdb.DB)
	planRepo := NewPlanRepository(tdb.DB)
	exerciseRepo := NewExerciseRepository(tdb.DB)
	ctx := context.Background()

	t.Run("List_empty", func(t *testing.T) {
		tdb.truncateTables(t)

		sessions, err := sessionRepo.List(ctx)
		if err != nil {
			t.Fatalf("List failed: %v", err)
		}
		if sessions != nil && len(sessions) != 0 {
			t.Errorf("expected empty list, got %d items", len(sessions))
		}
	})

	t.Run("Create_without_plan", func(t *testing.T) {
		tdb.truncateTables(t)

		now := time.Now().Truncate(time.Second)
		req := &models.CreateSessionRequest{
			Date:  now,
			Notes: "Morning workout",
		}

		session, err := sessionRepo.Create(ctx, req)
		if err != nil {
			t.Fatalf("Create failed: %v", err)
		}

		if session.ID == 0 {
			t.Error("expected non-zero ID")
		}
		if session.PlanID != nil {
			t.Errorf("expected nil plan_id, got %d", *session.PlanID)
		}
		if session.Notes != req.Notes {
			t.Errorf("notes = %q, want %q", session.Notes, req.Notes)
		}
		if session.CreatedAt.IsZero() {
			t.Error("expected non-zero created_at")
		}
	})

	t.Run("Create_with_plan", func(t *testing.T) {
		tdb.truncateTables(t)

		plan, _ := planRepo.Create(ctx, &models.CreatePlanRequest{Name: "Test Plan"})

		now := time.Now().Truncate(time.Second)
		req := &models.CreateSessionRequest{
			PlanID: &plan.ID,
			Date:   now,
			Notes:  "Following plan",
		}

		session, err := sessionRepo.Create(ctx, req)
		if err != nil {
			t.Fatalf("Create failed: %v", err)
		}

		if session.PlanID == nil {
			t.Fatal("expected plan_id, got nil")
		}
		if *session.PlanID != plan.ID {
			t.Errorf("plan_id = %d, want %d", *session.PlanID, plan.ID)
		}
	})

	t.Run("GetByID_found", func(t *testing.T) {
		tdb.truncateTables(t)

		created, _ := sessionRepo.Create(ctx, &models.CreateSessionRequest{
			Date:  time.Now(),
			Notes: "Test session",
		})

		session, err := sessionRepo.GetByID(ctx, created.ID)
		if err != nil {
			t.Fatalf("GetByID failed: %v", err)
		}
		if session == nil {
			t.Fatal("expected session, got nil")
		}
		if session.ID != created.ID {
			t.Errorf("ID = %d, want %d", session.ID, created.ID)
		}
		if session.Notes != "Test session" {
			t.Errorf("notes = %q, want Test session", session.Notes)
		}
	})

	t.Run("GetByID_with_plan", func(t *testing.T) {
		tdb.truncateTables(t)

		plan, _ := planRepo.Create(ctx, &models.CreatePlanRequest{Name: "My Plan"})

		created, _ := sessionRepo.Create(ctx, &models.CreateSessionRequest{
			PlanID: &plan.ID,
			Date:   time.Now(),
		})

		session, err := sessionRepo.GetByID(ctx, created.ID)
		if err != nil {
			t.Fatalf("GetByID failed: %v", err)
		}
		if session.Plan == nil {
			t.Fatal("expected plan, got nil")
		}
		if session.Plan.Name != "My Plan" {
			t.Errorf("plan name = %q, want My Plan", session.Plan.Name)
		}
	})

	t.Run("GetByID_with_entries", func(t *testing.T) {
		tdb.truncateTables(t)

		exercise, _ := exerciseRepo.Create(ctx, &models.CreateExerciseRequest{
			Name: "Bench Press",
			Type: models.ExerciseTypeStrength,
		})

		session, _ := sessionRepo.Create(ctx, &models.CreateSessionRequest{
			Date: time.Now(),
		})

		sessionRepo.AddEntry(ctx, session.ID, &models.CreateSessionEntryRequest{
			ExerciseID:    exercise.ID,
			Weight:        100,
			Reps:          10,
			SetsCompleted: 3,
		})

		fetched, err := sessionRepo.GetByID(ctx, session.ID)
		if err != nil {
			t.Fatalf("GetByID failed: %v", err)
		}
		if len(fetched.Entries) != 1 {
			t.Fatalf("expected 1 entry, got %d", len(fetched.Entries))
		}
		if fetched.Entries[0].Weight != 100 {
			t.Errorf("weight = %f, want 100", fetched.Entries[0].Weight)
		}
		if fetched.Entries[0].Exercise == nil {
			t.Fatal("expected exercise, got nil")
		}
		if fetched.Entries[0].Exercise.Name != "Bench Press" {
			t.Errorf("exercise name = %q, want Bench Press", fetched.Entries[0].Exercise.Name)
		}
	})

	t.Run("GetByID_not_found", func(t *testing.T) {
		tdb.truncateTables(t)

		session, err := sessionRepo.GetByID(ctx, 99999)
		if err != nil {
			t.Fatalf("GetByID failed: %v", err)
		}
		if session != nil {
			t.Errorf("expected nil, got %+v", session)
		}
	})

	t.Run("Update_found", func(t *testing.T) {
		tdb.truncateTables(t)

		created, _ := sessionRepo.Create(ctx, &models.CreateSessionRequest{
			Date:  time.Now(),
			Notes: "Old notes",
		})

		newDate := time.Now().Add(24 * time.Hour).Truncate(time.Second)
		updated, err := sessionRepo.Update(ctx, created.ID, &models.CreateSessionRequest{
			Date:  newDate,
			Notes: "New notes",
		})
		if err != nil {
			t.Fatalf("Update failed: %v", err)
		}
		if updated == nil {
			t.Fatal("expected updated session, got nil")
		}
		if updated.Notes != "New notes" {
			t.Errorf("notes = %q, want New notes", updated.Notes)
		}
	})

	t.Run("Update_add_plan", func(t *testing.T) {
		tdb.truncateTables(t)

		plan, _ := planRepo.Create(ctx, &models.CreatePlanRequest{Name: "New Plan"})

		created, _ := sessionRepo.Create(ctx, &models.CreateSessionRequest{
			Date: time.Now(),
		})

		updated, err := sessionRepo.Update(ctx, created.ID, &models.CreateSessionRequest{
			PlanID: &plan.ID,
			Date:   created.Date,
		})
		if err != nil {
			t.Fatalf("Update failed: %v", err)
		}
		if updated.PlanID == nil {
			t.Fatal("expected plan_id, got nil")
		}
		if *updated.PlanID != plan.ID {
			t.Errorf("plan_id = %d, want %d", *updated.PlanID, plan.ID)
		}
	})

	t.Run("Update_not_found", func(t *testing.T) {
		tdb.truncateTables(t)

		updated, err := sessionRepo.Update(ctx, 99999, &models.CreateSessionRequest{
			Date: time.Now(),
		})
		if err != nil {
			t.Fatalf("Update failed: %v", err)
		}
		if updated != nil {
			t.Errorf("expected nil, got %+v", updated)
		}
	})

	t.Run("Delete_found", func(t *testing.T) {
		tdb.truncateTables(t)

		created, _ := sessionRepo.Create(ctx, &models.CreateSessionRequest{
			Date: time.Now(),
		})

		err := sessionRepo.Delete(ctx, created.ID)
		if err != nil {
			t.Fatalf("Delete failed: %v", err)
		}

		session, _ := sessionRepo.GetByID(ctx, created.ID)
		if session != nil {
			t.Error("expected session to be deleted")
		}
	})

	t.Run("Delete_cascades_entries", func(t *testing.T) {
		tdb.truncateTables(t)

		exercise, _ := exerciseRepo.Create(ctx, &models.CreateExerciseRequest{
			Name: "Test Exercise",
			Type: models.ExerciseTypeStrength,
		})

		session, _ := sessionRepo.Create(ctx, &models.CreateSessionRequest{
			Date: time.Now(),
		})

		sessionRepo.AddEntry(ctx, session.ID, &models.CreateSessionEntryRequest{
			ExerciseID: exercise.ID,
			Weight:     50,
		})

		err := sessionRepo.Delete(ctx, session.ID)
		if err != nil {
			t.Fatalf("Delete failed: %v", err)
		}

		// Verify entries are deleted
		var count int
		tdb.QueryRowContext(ctx, "SELECT COUNT(*) FROM session_entries WHERE session_id = $1", session.ID).Scan(&count)
		if count != 0 {
			t.Errorf("expected 0 session_entries, got %d", count)
		}

		// But the exercise itself should still exist
		existingExercise, _ := exerciseRepo.GetByID(ctx, exercise.ID)
		if existingExercise == nil {
			t.Error("expected exercise to still exist")
		}
	})

	t.Run("Delete_not_found", func(t *testing.T) {
		tdb.truncateTables(t)

		err := sessionRepo.Delete(ctx, 99999)
		if err != sql.ErrNoRows {
			t.Errorf("expected sql.ErrNoRows, got %v", err)
		}
	})

	t.Run("List_multiple_ordered_by_date", func(t *testing.T) {
		tdb.truncateTables(t)

		now := time.Now().Truncate(time.Second)
		sessionRepo.Create(ctx, &models.CreateSessionRequest{Date: now.Add(-48 * time.Hour), Notes: "Two days ago"})
		sessionRepo.Create(ctx, &models.CreateSessionRequest{Date: now, Notes: "Today"})
		sessionRepo.Create(ctx, &models.CreateSessionRequest{Date: now.Add(-24 * time.Hour), Notes: "Yesterday"})

		sessions, err := sessionRepo.List(ctx)
		if err != nil {
			t.Fatalf("List failed: %v", err)
		}
		if len(sessions) != 3 {
			t.Errorf("len = %d, want 3", len(sessions))
		}
		// Results are ordered by date DESC
		if sessions[0].Notes != "Today" {
			t.Errorf("first session = %q, want Today", sessions[0].Notes)
		}
		if sessions[1].Notes != "Yesterday" {
			t.Errorf("second session = %q, want Yesterday", sessions[1].Notes)
		}
	})

	t.Run("AddEntry_strength", func(t *testing.T) {
		tdb.truncateTables(t)

		exercise, _ := exerciseRepo.Create(ctx, &models.CreateExerciseRequest{
			Name: "Squat",
			Type: models.ExerciseTypeStrength,
		})

		session, _ := sessionRepo.Create(ctx, &models.CreateSessionRequest{
			Date: time.Now(),
		})

		entry, err := sessionRepo.AddEntry(ctx, session.ID, &models.CreateSessionEntryRequest{
			ExerciseID:    exercise.ID,
			Weight:        140,
			Reps:          5,
			SetsCompleted: 5,
			Notes:         "Felt heavy",
		})
		if err != nil {
			t.Fatalf("AddEntry failed: %v", err)
		}

		if entry.ID == 0 {
			t.Error("expected non-zero ID")
		}
		if entry.SessionID != session.ID {
			t.Errorf("session_id = %d, want %d", entry.SessionID, session.ID)
		}
		if entry.Weight != 140 {
			t.Errorf("weight = %f, want 140", entry.Weight)
		}
		if entry.Reps != 5 {
			t.Errorf("reps = %d, want 5", entry.Reps)
		}
		if entry.SetsCompleted != 5 {
			t.Errorf("sets_completed = %d, want 5", entry.SetsCompleted)
		}
		if entry.Notes != "Felt heavy" {
			t.Errorf("notes = %q, want Felt heavy", entry.Notes)
		}
	})

	t.Run("AddEntry_cardio", func(t *testing.T) {
		tdb.truncateTables(t)

		exercise, _ := exerciseRepo.Create(ctx, &models.CreateExerciseRequest{
			Name: "Running",
			Type: models.ExerciseTypeCardio,
		})

		session, _ := sessionRepo.Create(ctx, &models.CreateSessionRequest{
			Date: time.Now(),
		})

		entry, err := sessionRepo.AddEntry(ctx, session.ID, &models.CreateSessionEntryRequest{
			ExerciseID: exercise.ID,
			Duration:   3600,
			Distance:   10.5,
			HeartRate:  155,
		})
		if err != nil {
			t.Fatalf("AddEntry failed: %v", err)
		}

		if entry.Duration != 3600 {
			t.Errorf("duration = %d, want 3600", entry.Duration)
		}
		if entry.Distance != 10.5 {
			t.Errorf("distance = %f, want 10.5", entry.Distance)
		}
		if entry.HeartRate != 155 {
			t.Errorf("heart_rate = %d, want 155", entry.HeartRate)
		}
	})

	t.Run("Plan_delete_sets_null_on_sessions", func(t *testing.T) {
		tdb.truncateTables(t)

		plan, _ := planRepo.Create(ctx, &models.CreatePlanRequest{Name: "Will be deleted"})

		session, _ := sessionRepo.Create(ctx, &models.CreateSessionRequest{
			PlanID: &plan.ID,
			Date:   time.Now(),
		})

		err := planRepo.Delete(ctx, plan.ID)
		if err != nil {
			t.Fatalf("Delete plan failed: %v", err)
		}

		// Session should still exist but with null plan_id
		fetched, _ := sessionRepo.GetByID(ctx, session.ID)
		if fetched == nil {
			t.Fatal("expected session to still exist")
		}
		if fetched.PlanID != nil {
			t.Errorf("expected nil plan_id after plan deletion, got %d", *fetched.PlanID)
		}
	})
}