package guitests;

import org.junit.Test;

import seedu.task.testutil.TestTask;
import seedu.task.testutil.TestUtil;

import static org.junit.Assert.assertTrue;
import static seedu.task.logic.commands.DeleteCommand.MESSAGE_DELETE_TASK_SUCCESS;

public class DeleteCommandTest extends TaskManagerGuiTest {

    @Test
    public void delete() {

        // delete the first in the list
        TestTask[] currentList = td.getTypicalTasks();
        int targetIndex = 1;
        assertDeleteSuccess(targetIndex, currentList);

        // delete the last in the list
        currentList = TestUtil.removeTaskFromList(currentList, targetIndex);
        targetIndex = currentList.length;
        assertDeleteSuccess(targetIndex, currentList);

        // delete from the middle of the list
        currentList = TestUtil.removeTaskFromList(currentList, targetIndex);
        targetIndex = currentList.length / 2;
        assertDeleteSuccess(targetIndex, currentList);

        // invalid index
        commandBox.runCommand("delete " + currentList.length + 1);
        assertResultMessage("The task index provided is invalid");

    }

    /**
     * Runs the delete command to delete the task at specified index and
     * confirms the result is correct.
     * 
     * @param targetIndexOneIndexed
     *            e.g. to delete the first task in the list, 1 should be given
     *            as the target index.
     * @param currentList
     *            A copy of the current list of tasks (before deletion).
     */
    private void assertDeleteSuccess(int targetIndexOneIndexed, final TestTask[] currentList) {
        TestTask taskToDelete = currentList[targetIndexOneIndexed - 1]; // -1 because array uses zero indexing
        TestTask[] expectedRemainder = TestUtil.removeTaskFromList(currentList, targetIndexOneIndexed);

        commandBox.runCommand("delete " + targetIndexOneIndexed);

        // confirm the list now contains all previous persons except the deleted task
        assertTrue(taskListPanel.isListMatching(expectedRemainder));

        // confirm the result message is correct
        assertResultMessage(String.format(MESSAGE_DELETE_TASK_SUCCESS, taskToDelete));
    }

}
