package cz.davza.studentadventure.commands;

import cz.davza.studentadventure.Items.Book;
import cz.davza.studentadventure.TestHelpers;
import cz.davza.studentadventure.enums.CommandState;
import cz.davza.studentadventure.objects.CommandResult;
import cz.davza.studentadventure.objects.GameData;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import static cz.davza.studentadventure.TestHelpers.execute;
import static org.junit.jupiter.api.Assertions.*;

class PickupCommandTest {

    private GameData context;

    @BeforeEach
    void setUp() {
        context = TestHelpers.buildGameData();
        // Bedroom starts with a Bed and Money — add a Book for pickup tests
        context.getMap().getCurrentRoom().getItems().Add(new Book(), 3);
    }

    @Test
    void pickupItemAddsToInventory() {
        execute("pickup book", context);
        assertNotNull(context.getPlayer().getInventory().GetByItemCode("book"));
    }

    @Test
    void pickupItemRemovesFromRoom() {
        int before = context.getMap().getCurrentRoom().getItems().GetByItemCode("book").getAmount();
        execute("pickup book", context);
        int after = context.getMap().getCurrentRoom().getItems().GetByItemCode("book").getAmount();
        assertEquals(before - 1, after);
    }

    @Test
    void pickupSpecificAmountPicksCorrectNumber() {
        execute("pickup book 2", context);
        assertEquals(2, context.getPlayer().getInventory().GetByItemCode("book").getAmount());
    }

    @Test
    void pickupReturnsSuccessState() {
        CommandResult result = execute("pickup book", context);
        assertEquals(CommandState.SUCCESS, result.getResultState());
    }

    @Test
    void pickupNonExistentItemReturnsItemNotFound() {
        CommandResult result = execute("pickup energy_drink", context);
        assertEquals(CommandState.ITEM_NOT_FOUND, result.getResultState());
    }

    @Test
    void pickupNonCollectableReturnsNotCollectable() {
        // Bed is in bedroom and is not collectable
        CommandResult result = execute("pickup bed", context);
        assertEquals(CommandState.ITEM_NOT_COLLECTABLE, result.getResultState());
    }

    @Test
    void pickupWithNoParamsReturnsInvalidParams() {
        CommandResult result = execute("pickup", context);
        assertEquals(CommandState.INVALID_PARAMS, result.getResultState());
    }

    @Test
    void pickupWhenInventoryFullReturnsInventoryFull() {
        // Fill inventory: capacity 20, book bulk 3 → 6 books fill 18, 7th won't all fit
        context.getMap().getCurrentRoom().getItems().Add(new Book(), 10);
        // Add 6 books to inventory (uses 18 capacity, 2 remaining — not enough for another book at bulk 3)
        context.getPlayer().getInventory().Add(new Book(), 6);
        CommandResult result = execute("pickup book 1", context);
        assertEquals(CommandState.INVENTORY_FULL, result.getResultState());
    }

    @Test
    void pickupWithNonNumberAmountReturnsInvalidParams() {
        CommandResult result = execute("pickup book abc", context);
        assertEquals(CommandState.INVALID_PARAMS, result.getResultState());
    }

    @Test
    void pickupDefaultsToOneWhenNoAmountGiven() {
        execute("pickup book", context);
        assertEquals(1, context.getPlayer().getInventory().GetByItemCode("book").getAmount());
    }
}