// 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 Common
import Foundation
import Macros
import P4Compiler
import P4Lang
import P4Runtime
import SwiftTreeSitter
import Testing
import TreeSitter
import TreeSitterP4

@testable import P4Runtime

func shrink(_ from: String) -> String {
  return from.replacing(Regex(#/\n[\s]+/#), with: "").replacing("\n", with: "")
}

@Test func test_codegen_parser_state_direct_transition() async throws {
  let simple_parser_declaration = """
    parser main_parser() {
       state start {
           true;
           transition start;
       }
    };
    """
  let program = try #UseOkResult(Program.Compile(simple_parser_declaration))
  let cg = try #UseOkResult(CodeGenerator().codeGen(program))

  let expected = shrink(
    """
    [
        {
            name: "main_parser",
            init_state: "start",
            parse_states: [
                {
                    name: "start",
                    transitions: []
                },
            ]
        }
    ]
    """)

  #expect(expected == cg.getGeneratedCode())
}

@Test func test_codegen_parser_state_select_transition() async throws {
  let simple_parser_declaration = """
    parser main_parser() {
       state start {
            transition select (false) {
              true: reject;
              false: reject;
           };
       }
    };
    """
  let program = try #UseOkResult(Program.Compile(simple_parser_declaration))
  let cg = try #UseOkResult(CodeGenerator().codeGen(program))

  /// TODO: Fix this test.
  let expected = shrink(
    """
    [
        {
            name: "main_parser",
            init_state: "start",
            parse_states: [
                {
                    name: "start",
                    transitions: [Select]
                },
            ]
        }
    ]
    """)

  #expect(expected == cg.getGeneratedCode())
}