package fr.luc.bettermcguis;

import fr.luc.bettermcguis.api.GuiItem;
import fr.luc.bettermcguis.api.GuiType;
import fr.luc.bettermcguis.api.slot.SlotRange;
import fr.luc.bettermcguis.type.PaginatedGui;
import org.bukkit.Material;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

import java.util.concurrent.atomic.AtomicInteger;

import static org.junit.jupiter.api.Assertions.*;

public class PaginatedGuiTest {

    @Test
    @DisplayName("PaginatedGui doit calculer correctement le nombre total de pages")
    void testPaginationMath() {
        PaginatedGui gui = new PaginatedGui("Paginated Test", GuiType.CHEST_3_ROWS);
        gui.setItemSlots(SlotRange.of(10, 16)); // 7 slots par page

        assertEquals(7, gui.getPageSize());
        assertEquals(1, gui.getTotalPages()); // 0 items -> 1 page vide

        for (int i = 0; i < 20; i++) {
            gui.addPageItem(GuiItem.of(Material.GOLD_INGOT));
        }

        // 20 items / 7 par page -> 3 pages (7 + 7 + 6)
        assertEquals(3, gui.getTotalPages());
        assertEquals(1, gui.getCurrentPage());
        assertTrue(gui.hasNextPage());
        assertFalse(gui.hasPreviousPage());
    }

    @Test
    @DisplayName("PaginatedGui doit naviguer entre les pages et déclencher l'événement")
    void testPageNavigationAndEvents() {
        PaginatedGui gui = new PaginatedGui("Paginated Test", GuiType.CHEST_3_ROWS);
        gui.setItemSlots(SlotRange.of(10, 16));

        for (int i = 0; i < 20; i++) {
            gui.addPageItem(GuiItem.of(Material.EMERALD));
        }

        AtomicInteger eventFired = new AtomicInteger(0);
        gui.onPageChange(evt -> {
            eventFired.incrementAndGet();
            assertEquals(1, evt.getOldPage());
            assertEquals(2, evt.getNewPage());
        });

        assertTrue(gui.nextPage());
        assertEquals(2, gui.getCurrentPage());
        assertEquals(1, eventFired.get());

        assertTrue(gui.hasPreviousPage());
        assertTrue(gui.hasNextPage());

        assertTrue(gui.nextPage());
        assertEquals(3, gui.getCurrentPage());
        assertFalse(gui.hasNextPage()); // Fin du catalogue

        // Impossible d'avancer plus loin
        assertFalse(gui.nextPage());
        assertEquals(3, gui.getCurrentPage());
    }
}