package main

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

	_ "github.com/mattn/go-sqlite3"
	"github.com/ryanchen/bbq/db"
)

func setupTestDB(t *testing.T) (*sql.DB, *db.Queries) {
	t.Helper()
	database, err := sql.Open("sqlite3", ":memory:?_foreign_keys=on")
	if err != nil {
		t.Fatal(err)
	}
	if _, err := database.Exec(schemaSQL); err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { database.Close() })
	return database, db.New(database)
}

func createTestEvent(t *testing.T, q *db.Queries) db.Event {
	t.Helper()
	event, err := q.CreateEvent(context.Background(), db.CreateEventParams{
		Slug: "test", Title: "Test Event", Date: "June 1", Time: "2pm",
		Location: "Park", AdminToken: "tok123",
	})
	if err != nil {
		t.Fatal(err)
	}
	return event
}

// autoRsvp simulates the merged handleRsvp logic: create RSVP (deduped) + optional claim
func autoRsvp(ctx context.Context, q *db.Queries, event db.Event, name string, note string, slotID *int64) error {
	return autoRsvpPlusOne(ctx, q, event, name, note, 0, slotID)
}

func autoRsvpPlusOne(ctx context.Context, q *db.Queries, event db.Event, name string, note string, plusOne int64, slotID *int64) error {
	if slotID != nil {
		_, err := q.CreateClaim(ctx, db.CreateClaimParams{
			SlotID: *slotID, Name: name, Note: note,
		})
		if err != nil {
			return err
		}
	}

	_, err := q.GetRsvpByName(ctx, db.GetRsvpByNameParams{
		EventID: event.ID, Name: name,
	})
	if err == sql.ErrNoRows {
		_, err = q.CreateRsvp(ctx, db.CreateRsvpParams{
			EventID: event.ID, Name: name, Note: note, PlusOne: plusOne,
		})
		return err
	}
	return nil
}

func TestRsvpOnly(t *testing.T) {
	_, q := setupTestDB(t)
	ctx := context.Background()
	event := createTestEvent(t, q)

	if err := autoRsvp(ctx, q, event, "Alice", "", nil); err != nil {
		t.Fatal(err)
	}

	rsvps, _ := q.ListRsvps(ctx, event.ID)
	if len(rsvps) != 1 {
		t.Fatalf("expected 1 RSVP, got %d", len(rsvps))
	}
	if rsvps[0].Name != "Alice" {
		t.Fatalf("expected RSVP name Alice, got %s", rsvps[0].Name)
	}
}

func TestRsvpWithClaim(t *testing.T) {
	_, q := setupTestDB(t)
	ctx := context.Background()
	event := createTestEvent(t, q)

	slot, err := q.CreateSlot(ctx, db.CreateSlotParams{
		EventID: event.ID, Name: "Drinks", MaxClaims: 5,
	})
	if err != nil {
		t.Fatal(err)
	}

	if err := autoRsvp(ctx, q, event, "Alice", "sparkling water", &slot.ID); err != nil {
		t.Fatal(err)
	}

	// Check RSVP created
	rsvps, _ := q.ListRsvps(ctx, event.ID)
	if len(rsvps) != 1 {
		t.Fatalf("expected 1 RSVP, got %d", len(rsvps))
	}
	if rsvps[0].Name != "Alice" {
		t.Fatalf("expected RSVP name Alice, got %s", rsvps[0].Name)
	}

	// Check claim created
	claims, _ := q.ListClaimsByEvent(ctx, event.ID)
	if len(claims) != 1 {
		t.Fatalf("expected 1 claim, got %d", len(claims))
	}
	if claims[0].Name != "Alice" {
		t.Fatalf("expected claim name Alice, got %s", claims[0].Name)
	}
}

func TestRsvpNoDuplicate(t *testing.T) {
	_, q := setupTestDB(t)
	ctx := context.Background()
	event := createTestEvent(t, q)

	slot, _ := q.CreateSlot(ctx, db.CreateSlotParams{
		EventID: event.ID, Name: "Drinks", MaxClaims: 5,
	})

	// RSVP first (no slot)
	autoRsvp(ctx, q, event, "Bob", "", nil)

	// Then RSVP again with a slot claim — should not duplicate RSVP
	autoRsvp(ctx, q, event, "Bob", "", &slot.ID)

	rsvps, _ := q.ListRsvps(ctx, event.ID)
	if len(rsvps) != 1 {
		t.Fatalf("expected 1 RSVP (no duplicate), got %d", len(rsvps))
	}
}

func TestRsvpCaseInsensitiveDedup(t *testing.T) {
	_, q := setupTestDB(t)
	ctx := context.Background()
	event := createTestEvent(t, q)

	slot, _ := q.CreateSlot(ctx, db.CreateSlotParams{
		EventID: event.ID, Name: "Drinks", MaxClaims: 5,
	})

	// RSVP as "alice"
	autoRsvp(ctx, q, event, "alice", "", nil)

	// Claim as "Alice" — should not create duplicate RSVP
	autoRsvp(ctx, q, event, "Alice", "", &slot.ID)

	rsvps, _ := q.ListRsvps(ctx, event.ID)
	if len(rsvps) != 1 {
		t.Fatalf("expected 1 RSVP (case-insensitive dedup), got %d", len(rsvps))
	}
}

func TestDeduplicateExistingRsvps(t *testing.T) {
	database, q := setupTestDB(t)
	ctx := context.Background()
	event := createTestEvent(t, q)

	// Insert duplicate RSVPs directly
	q.CreateRsvp(ctx, db.CreateRsvpParams{EventID: event.ID, Name: "Charlie", PlusOne: 0})
	q.CreateRsvp(ctx, db.CreateRsvpParams{EventID: event.ID, Name: "Charlie", PlusOne: 0})
	q.CreateRsvp(ctx, db.CreateRsvpParams{EventID: event.ID, Name: "charlie", PlusOne: 0})
	q.CreateRsvp(ctx, db.CreateRsvpParams{EventID: event.ID, Name: "Dana", PlusOne: 0})

	rsvps, _ := q.ListRsvps(ctx, event.ID)
	if len(rsvps) != 4 {
		t.Fatalf("expected 4 RSVPs before dedup, got %d", len(rsvps))
	}

	// Run the dedup query (same as migration)
	database.Exec(`DELETE FROM rsvps WHERE id NOT IN (SELECT MIN(id) FROM rsvps GROUP BY event_id, name COLLATE NOCASE)`)

	rsvps, _ = q.ListRsvps(ctx, event.ID)
	if len(rsvps) != 2 {
		t.Fatalf("expected 2 RSVPs after dedup (Charlie + Dana), got %d", len(rsvps))
	}
}

func TestUpdateRsvp(t *testing.T) {
	_, q := setupTestDB(t)
	ctx := context.Background()
	event := createTestEvent(t, q)

	rsvp, err := q.CreateRsvp(ctx, db.CreateRsvpParams{
		EventID: event.ID, Name: "Alice", Note: "hi", PlusOne: 1,
	})
	if err != nil {
		t.Fatal(err)
	}

	err = q.UpdateRsvp(ctx, db.UpdateRsvpParams{
		Name: "Alicia", Note: "updated", PlusOne: 3, ID: rsvp.ID,
	})
	if err != nil {
		t.Fatal(err)
	}

	updated, err := q.GetRsvp(ctx, rsvp.ID)
	if err != nil {
		t.Fatal(err)
	}
	if updated.Name != "Alicia" {
		t.Fatalf("expected name Alicia, got %s", updated.Name)
	}
	if updated.Note != "updated" {
		t.Fatalf("expected note 'updated', got %s", updated.Note)
	}
	if updated.PlusOne != 3 {
		t.Fatalf("expected PlusOne=3, got %d", updated.PlusOne)
	}
}

func TestRsvpPlusOne(t *testing.T) {
	_, q := setupTestDB(t)
	ctx := context.Background()
	event := createTestEvent(t, q)

	if err := autoRsvpPlusOne(ctx, q, event, "Alice", "", 2, nil); err != nil {
		t.Fatal(err)
	}

	rsvps, _ := q.ListRsvps(ctx, event.ID)
	if len(rsvps) != 1 {
		t.Fatalf("expected 1 RSVP, got %d", len(rsvps))
	}
	if rsvps[0].PlusOne != 2 {
		t.Fatalf("expected PlusOne=2, got %d", rsvps[0].PlusOne)
	}
}