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
}

func TestAutoRsvpOnClaim(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)
	}

	// Claim a slot — should also create an RSVP
	_, err = q.CreateClaim(ctx, db.CreateClaimParams{
		SlotID: slot.ID, Name: "Alice",
	})
	if err != nil {
		t.Fatal(err)
	}

	// Simulate the auto-RSVP logic from handleClaim
	_, err = q.GetRsvpByName(ctx, db.GetRsvpByNameParams{
		EventID: event.ID, Name: "Alice",
	})
	if err == sql.ErrNoRows {
		_, err = q.CreateRsvp(ctx, db.CreateRsvpParams{
			EventID: event.ID, Name: "Alice",
		})
		if 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 TestAutoRsvpNoDuplicate(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
	q.CreateRsvp(ctx, db.CreateRsvpParams{
		EventID: event.ID, Name: "Bob",
	})

	// Then claim — auto-RSVP should skip
	q.CreateClaim(ctx, db.CreateClaimParams{
		SlotID: slot.ID, Name: "Bob",
	})
	_, err := q.GetRsvpByName(ctx, db.GetRsvpByNameParams{
		EventID: event.ID, Name: "Bob",
	})
	if err == sql.ErrNoRows {
		q.CreateRsvp(ctx, db.CreateRsvpParams{
			EventID: event.ID, Name: "Bob",
		})
	}

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

func TestAutoRsvpCaseInsensitive(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"
	q.CreateRsvp(ctx, db.CreateRsvpParams{
		EventID: event.ID, Name: "alice",
	})

	// Claim as "Alice" — should not create duplicate
	q.CreateClaim(ctx, db.CreateClaimParams{
		SlotID: slot.ID, Name: "Alice",
	})
	_, err := q.GetRsvpByName(ctx, db.GetRsvpByNameParams{
		EventID: event.ID, Name: "Alice",
	})
	if err == sql.ErrNoRows {
		q.CreateRsvp(ctx, db.CreateRsvpParams{
			EventID: event.ID, Name: "Alice",
		})
	}

	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"})
	q.CreateRsvp(ctx, db.CreateRsvpParams{EventID: event.ID, Name: "Charlie"})
	q.CreateRsvp(ctx, db.CreateRsvpParams{EventID: event.ID, Name: "charlie"})
	q.CreateRsvp(ctx, db.CreateRsvpParams{EventID: event.ID, Name: "Dana"})

	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))
	}
}