#include "linkedlist.h"
#include <catch2/catch_test_macros.hpp>

TEST_CASE("Append 3 items to linkedlist", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.append(8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);

    list.append(9);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(1) == 9);

    list.append(10);
    REQUIRE(list.len() == 3);
    REQUIRE(list.get(2) == 10);

}

TEST_CASE("Prepend 3 items to linkedlist", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.prepend(8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);

    list.prepend(9);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(0) == 9);

    list.prepend(10);
    REQUIRE(list.len() == 3);
    REQUIRE(list.get(0) == 10);

}

TEST_CASE("Get out ouf bounds item", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.append(8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);

    list.append(9);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(1) == 9);

    list.append(10);
    REQUIRE(list.len() == 3);
    REQUIRE(list.get(2) == 10);

    auto result = list.get(50);
    REQUIRE(!result.has_value());
    REQUIRE(result.error() == LinkedListErr::LINKEDLIST_OUT_OF_BOUNDS);
}

TEST_CASE("Set head to val", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.append(8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);

    list.append(9);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(1) == 9);

    list.append(10);
    REQUIRE(list.len() == 3);
    REQUIRE(list.get(2) == 10);

    auto result = list.set(0, 90);
    REQUIRE(list.len() == 3);
    REQUIRE(result == LinkedListErr::LINKEDLIST_OK);
    REQUIRE(list.get(0) == 90);
}

TEST_CASE("Set tail to val", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.append(8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);

    list.append(9);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(1) == 9);

    list.append(10);
    REQUIRE(list.len() == 3);
    REQUIRE(list.get(2) == 10);

    auto result = list.set(2, 90);
    REQUIRE(list.len() == 3);
    REQUIRE(result == LinkedListErr::LINKEDLIST_OK);
    REQUIRE(list.get(2) == 90);
}

TEST_CASE("Set to out of bounds", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.append(8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);

    list.append(9);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(1) == 9);

    list.append(10);
    REQUIRE(list.len() == 3);
    REQUIRE(list.get(2) == 10);

    auto result = list.set(50, 90);
    REQUIRE(list.len() == 3);
    REQUIRE(result == LinkedListErr::LINKEDLIST_OUT_OF_BOUNDS);
}

TEST_CASE("Pop element", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.append(8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);

    list.append(9);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(1) == 9);

    list.append(10);
    REQUIRE(list.len() == 3);
    REQUIRE(list.get(2) == 10);

    REQUIRE(list.pop() == 10);
    REQUIRE(list.len() == 2);
}

TEST_CASE("Pop empty", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    auto result = list.pop();
    REQUIRE(result.error() == LinkedListErr::LINKEDLIST_EMPTY);
    REQUIRE(list.len() == 0);
}

TEST_CASE("Remove head", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.append(8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);

    list.append(9);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(1) == 9);

    list.append(10);
    REQUIRE(list.len() == 3);
    REQUIRE(list.get(2) == 10);

    auto result = list.remove(0);
    REQUIRE(result == LinkedListErr::LINKEDLIST_OK);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(0) == 9);
}

TEST_CASE("Remove tail", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.append(8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);

    list.append(9);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(1) == 9);

    list.append(10);
    REQUIRE(list.len() == 3);
    REQUIRE(list.get(2) == 10);

    auto result = list.remove(2);
    REQUIRE(result == LinkedListErr::LINKEDLIST_OK);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(1) == 9);
}

TEST_CASE("Find 1 value present", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.append(8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);

    list.append(9);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(1) == 9);

    list.append(10);
    REQUIRE(list.len() == 3);
    REQUIRE(list.get(2) == 10);

    auto result = list.find(9);
    REQUIRE(result == 1);
}

TEST_CASE("Find 1 value not present", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.append(8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);

    list.append(9);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(1) == 9);

    list.append(10);
    REQUIRE(list.len() == 3);
    REQUIRE(list.get(2) == 10);

    auto result = list.find(80);
    REQUIRE(result.error() == LinkedListErr::LINKEDLIST_NOT_FOUND);
}

TEST_CASE("Insert at empty list", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.insert(0, 8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);
}

TEST_CASE("Insert at start of list", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.append(8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);

    list.append(9);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(1) == 9);

    list.append(10);
    REQUIRE(list.len() == 3);
    REQUIRE(list.get(2) == 10);

    list.insert(0, 90);
    REQUIRE(list.len() == 4);
    REQUIRE(list.get(0) == 90);
}

TEST_CASE("Insert at end of list", "[linkedlist]") {
    LinkedList<int> list = {};

    REQUIRE(list.len() == 0);

    list.append(8);
    REQUIRE(list.len() == 1);
    REQUIRE(list.get(0) == 8);

    list.append(9);
    REQUIRE(list.len() == 2);
    REQUIRE(list.get(1) == 9);

    list.append(10);
    REQUIRE(list.len() == 3);
    REQUIRE(list.get(2) == 10);

    list.insert(2, 90);
    REQUIRE(list.len() == 4);
    REQUIRE(list.get(2) == 90);
}