#include "ast/statements/let.hpp"

#include "ast/ast.hpp"
#include "utils.hpp"

#include <doctest.h>
#include <memory>

void test_let_statement(ast::statement* stmt, const std::string name) {
    REQUIRE(stmt->token_literal() == "let");
    ast::let_stmt* let_stmt = test::utils::cast<ast::let_stmt>(stmt);

    REQUIRE(let_stmt->name->value == name);
    REQUIRE(let_stmt->name->token_literal() == name);
}

TEST_SUITE("Parser: let") {
    TEST_CASE("Malformed let statement (checking for memory leaks)") {
        SUBCASE("Second token not identifier") {
            test::utils::test_failing_parsing(
                "let 5 = 5;",
                {token::type::IDENTIFIER}
            );
        }

        SUBCASE("Third token not '='") {
            test::utils::test_failing_parsing(
                "let five ! 5;",
                {token::type::ASSIGN}
            );
        }

        SUBCASE("Missing both identifier and '='") {
            test::utils::test_failing_parsing(
                "let 5;",
                {token::type::IDENTIFIER}
            );
        }

        SUBCASE("Multiple parsing errors") {
            test::utils::test_failing_parsing(
                "let 5; let ! = 5; let five = 5; let five 5; let;",
                {token::type::IDENTIFIER,
                 token::type::IDENTIFIER,
                 token::type::ASSIGN,
                 token::type::IDENTIFIER},
                1
            );
        }
    }

    TEST_CASE_FIXTURE(
        test::utils::ParserFixture,
        "Parse well formed let statements"
    ) {
        setup("\
let x = 5;\
let y = 10;\
let foobar = 103213;\
");

        REQUIRE(program->statements.size() == 3);

        struct test {
            std::string expected_identifier;
        };

        test tests[]{
            "x",
            "y",
            "foobar",
        };

        int i = 0;
        for (const auto& t : tests) {
            ast::statement* stmt = program->statements[i++];

            test_let_statement(stmt, t.expected_identifier);
        }
    }
}