// p4rse, Copyright 2026, Will Hawkins
//
// This file is part of p4rse.
//
// This file is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

import Testing
import TreeSitter
import SwiftTreeSitter
import TreeSitterP4
import Foundation
import Runtime
import Common

import Macros

@testable import Parser

@Test func test_simple_parser() async throws {
    let simple_parser_declaration = """
        parser main_parser() {
           state start {
               transition drop;
           }
        };
        """

    let program = try #UseOkResult(Parser.Program(simple_parser_declaration))
    let parser = try #UseOkResult(program.find_parser(withName: Identifier(name: "main_parser")))

    #expect(parser.states.count == 1)
    #expect(parser.states[0].state_name == "start")
    #expect(parser.states[0].statements.count == 0)
}

@Test func test_simple_parser_syntax_error() async throws {
    let simple_parser_declaration = """
        parser main_parser() {
           state
               transition drop;
           }
        };
        """
    #expect(#RequireErrorResult(Error(withMessage: "Could not compile the P4 program"), Parser.Program(simple_parser_declaration)))
}

@Test func test_simple_parser_with_statement() async throws {
    let simple_parser_declaration = """
        parser main_parser() {
           state start {
               true;
               transition drop;
           }
        };
        """

    let program = try #UseOkResult(Parser.Program(simple_parser_declaration))
    let parser = try #UseOkResult(program.find_parser(withName: Identifier(name: "main_parser")))

    #expect(parser.states.count == 1)
    #expect(parser.states[0].state_name == "start")
    #expect(parser.states[0].statements.count == 1)
}

@Test func test_simple_parser_with_instantiation() async throws {
    let simple_parser_declaration = """
        parser main_parser() {
           state start {
               true;
               transition drop;
           }
        };
        bool() main;
        """

    let program = try #UseOkResult(Parser.Program(simple_parser_declaration))

    let parser = try #UseOkResult(program.find_parser(withName: Identifier(name: "main_parser")))
    #expect(parser.states.count == 1)
    #expect(parser.states[0].state_name == "start")
    #expect(parser.states[0].statements.count == 1)
}