// 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 P4Lang
import P4Runtime
import SwiftTreeSitter
import Testing
import TreeSitter
import TreeSitterP4

@testable import P4Compiler

@Test func test_array_access() async throws {
  let simple_parser_declaration = """
      parser main_parser() {
        state start {
          bool where_to = ta[1] == 2;
          transition select (where_to) {
            true: accept;
            false: reject;
          };
        }
      };
    """
  var test_declarations = StaticVarValueScopes().enter()
  test_declarations = test_declarations.declare(
    identifier: Identifier(name: "ta"),
    withValue: (P4QualifiedType(P4Array(withValueType: P4QualifiedType(P4Int()))), .none))

  var test_values = VarValueScopes().enter()

  test_values = test_values.declare(
    identifier: Identifier(name: "ta"),
    withValue: P4Value(
      P4ArrayValue(
        withType: P4QualifiedType(P4Int()),
        withValue: [
          P4Value(P4IntValue(withValue: 1)), P4Value(P4IntValue(withValue: 2)),
          P4Value(P4IntValue(withValue: 3)),
        ])))
  let program = try #UseOkResult(
    Program.Compile(simple_parser_declaration, withGlobalInstances: test_declarations))
  let runtime = try #UseOkResult(
    P4Runtime.Runtime<InstantiatedParserState, P4Lang.ParserValue>.create(
      program: program, withGlobalValues: test_values))
  let (state_result, _) = try! #UseOkResult(runtime.run())

  #expect(state_result == P4Lang.accept)
}

@Test func test_array_access_invalid_type() async throws {
  let simple_parser_declaration = """
      parser main_parser() {
        state start {
          bool where_to = ta[1];
          transition select (where_to) {
            true: accept;
            false: reject;
          };
        }
      };
    """
  var test_declarations = StaticVarValueScopes().enter()
  test_declarations = test_declarations.declare(
    identifier: Identifier(name: "ta"), withValue: (P4QualifiedType(P4Int()), .none))

  #expect(
    #RequireErrorResult(
      Error(
        withMessage:
          "{49, 22}: Failed to parse a statement element: {65, 2}: ta does not name an array type"
      ),
      Program.Compile(simple_parser_declaration, withGlobalInstances: test_declarations))
  )
}

@Test func test_array_access2() async throws {
  let simple_parser_declaration = """
      parser main_parser() {
        state start {
          bool where_to = ta[0] == 2;
          transition select (where_to) {
            true: accept;
            false: reject;
          };
        }
      };
    """
  var test_declarations = StaticVarValueScopes().enter()
  test_declarations = test_declarations.declare(
    identifier: Identifier(name: "ta"),
    withValue: (P4QualifiedType(P4Array(withValueType: P4QualifiedType(P4Int()))), .none))
  var test_values = VarValueScopes().enter()

  test_values = test_values.declare(
    identifier: Identifier(name: "ta"),
    withValue: P4Value(
      P4ArrayValue(
        withType: P4QualifiedType(P4Int()),
        withValue: [
          P4Value(P4IntValue(withValue: 1)), P4Value(P4IntValue(withValue: 2)),
          P4Value(P4IntValue(withValue: 3)),
        ])))
  let program = try #UseOkResult(
    Program.Compile(simple_parser_declaration, withGlobalInstances: test_declarations))
  let runtime = try #UseOkResult(
    P4Runtime.Runtime<InstantiatedParserState, P4Lang.ParserValue>.create(
      program: program, withGlobalValues: test_values))
  let (state_result, _) = try! #UseOkResult(runtime.run())

  #expect(state_result == P4Lang.reject)
}

@Test func test_array_access3() async throws {
  let simple_parser_declaration = """
      parser main_parser() {
        state start {
          transition select (ta[0] == 1) {
            true: accept;
            false: reject;
          };
        }
      };
    """
  var test_declarations = StaticVarValueScopes().enter()
  test_declarations = test_declarations.declare(
    identifier: Identifier(name: "ta"),
    withValue: (P4QualifiedType(P4Array(withValueType: P4QualifiedType(P4Int()))), .none))

  var test_values = VarValueScopes().enter()
  test_values = test_values.declare(
    identifier: Identifier(name: "ta"),
    withValue: P4Value(
      P4ArrayValue(
        withType: P4QualifiedType(P4Int()),
        withValue: [
          P4Value(P4IntValue(withValue: 1)), P4Value(P4IntValue(withValue: 2)),
          P4Value(P4IntValue(withValue: 3)),
        ])))
  let program = try #UseOkResult(
    Program.Compile(simple_parser_declaration, withGlobalInstances: test_declarations))
  let runtime = try #UseOkResult(
    P4Runtime.Runtime<InstantiatedParserState, P4Lang.ParserValue>.create(
      program: program, withGlobalValues: test_values))
  let (state_result, _) = try! #UseOkResult(runtime.run())

  #expect(state_result == P4Lang.accept)
}

@Test func test_array_access4() async throws {
  let simple_parser_declaration = """
      parser main_parser() {
        state start {
          transition select (ta[1] == 2) {
            true: accept;
            false: reject;
          };
        }
      };
    """
  var test_declarations = StaticVarValueScopes().enter()
  test_declarations = test_declarations.declare(
    identifier: Identifier(name: "ta"),
    withValue: (P4QualifiedType(P4Array(withValueType: P4QualifiedType(P4Int()))), .none))
  var test_values = VarValueScopes().enter()
  test_values = test_values.declare(
    identifier: Identifier(name: "ta"),
    withValue: P4Value(
      P4ArrayValue(
        withType: P4QualifiedType(P4Int()),
        withValue: [
          P4Value(P4IntValue(withValue: 1)), P4Value(P4IntValue(withValue: 2)),
          P4Value(P4IntValue(withValue: 3)),
        ])))
  let program = try #UseOkResult(
    Program.Compile(simple_parser_declaration, withGlobalInstances: test_declarations))
  let runtime = try #UseOkResult(
    P4Runtime.Runtime<InstantiatedParserState, P4Lang.ParserValue>.create(
      program: program, withGlobalValues: test_values))
  let (state_result, _) = try! #UseOkResult(runtime.run())

  #expect(state_result == P4Lang.accept)
}

@Test func test_array_access_nested() async throws {
  let simple_parser_declaration = """
      parser main_parser() {
        state start {
          int where_to = ta[0][0];
          transition select (where_to == 5) {
            true: accept;
            false: reject;
          };
        }
      };
    """
  var test_declarations = StaticVarValueScopes().enter()
  test_declarations = test_declarations.declare(
    identifier: Identifier(name: "ta"),
    withValue: (
      P4QualifiedType(
        P4Array(withValueType: P4QualifiedType(P4Array(withValueType: P4QualifiedType(P4Int()))))),
      .none
    ))
  var test_values = VarValueScopes().enter()

  let nested = P4Value(
    P4ArrayValue(
      withType: P4QualifiedType(P4Int()),
      withValue: [
        P4Value(P4IntValue(withValue: 5)), P4Value(P4IntValue(withValue: 2)),
        P4Value(P4IntValue(withValue: 3)),
      ]))

  test_values = test_values.declare(
    identifier: Identifier(name: "ta"),
    withValue: P4Value(
      P4ArrayValue(
        withType: P4QualifiedType(P4Array(withValueType: P4QualifiedType(P4Int()))),
        withValue: [nested])))

  let program = try #UseOkResult(
    Program.Compile(simple_parser_declaration, withGlobalInstances: test_declarations))
  let runtime = try #UseOkResult(
    P4Runtime.Runtime<InstantiatedParserState, P4Lang.ParserValue>.create(
      program: program, withGlobalValues: test_values))
  let (state_result, _) = try! #UseOkResult(runtime.run())

  #expect(state_result == P4Lang.accept)
}

@Test func test_array_set() async throws {
  let simple_parser_declaration = """
      parser main_parser() {
        state start {
          ta[1] = 3;
          bool where_to = ta[1] == 3;
          transition select (where_to) {
            true: accept;
            false: reject;
          };
        }
      };
    """
  var test_declarations = StaticVarValueScopes().enter()
  test_declarations = test_declarations.declare(
    identifier: Identifier(name: "ta"),
    withValue: (P4QualifiedType(P4Array(withValueType: P4QualifiedType(P4Int()))), .none))

  var test_values = VarValueScopes().enter()
  test_values = test_values.declare(
    identifier: Identifier(name: "ta"),
    withValue: P4Value(
      P4ArrayValue(
        withType: P4QualifiedType(P4Int()),
        withValue: [
          P4Value(P4IntValue(withValue: 1)), P4Value(P4IntValue(withValue: 2)),
          P4Value(P4IntValue(withValue: 3)),
        ])))

  let program = try #UseOkResult(
    Program.Compile(simple_parser_declaration, withGlobalInstances: test_declarations))
  let runtime = try #UseOkResult(
    P4Runtime.Runtime<InstantiatedParserState, P4Lang.ParserValue>.create(
      program: program, withGlobalValues: test_values))
  let (state_result, _) = try! #UseOkResult(runtime.run())

  #expect(state_result == P4Lang.accept)
}

@Test func test_array_set_nested() async throws {
  let simple_parser_declaration = """
      parser main_parser() {
        state start {
          ta[0][0] = 5;
          int where_to = ta[0][0];
          transition select (where_to == 5) {
            true: accept;
            false: reject;
          };
        }
      };
    """
  var test_declarations = StaticVarValueScopes().enter()
  test_declarations = test_declarations.declare(
    identifier: Identifier(name: "ta"),
    withValue: (
      P4QualifiedType(
        P4Array(withValueType: P4QualifiedType(P4Array(withValueType: P4QualifiedType(P4Int()))))),
      .none
    ))

  var test_values = VarValueScopes().enter()

  let nested = P4Value(
    P4ArrayValue(
      withType: P4QualifiedType(P4Int()),
      withValue: [
        P4Value(P4IntValue(withValue: 1)), P4Value(P4IntValue(withValue: 2)),
        P4Value(P4IntValue(withValue: 3)),
      ]))

  test_values = test_values.declare(
    identifier: Identifier(name: "ta"),
    withValue: P4Value(
      P4ArrayValue(
        withType: P4QualifiedType(P4Array(withValueType: P4QualifiedType(P4Int()))),
        withValue: [nested])))

  let program = try #UseOkResult(
    Program.Compile(simple_parser_declaration, withGlobalInstances: test_declarations))
  let runtime = try #UseOkResult(
    P4Runtime.Runtime<InstantiatedParserState, P4Lang.ParserValue>.create(
      program: program, withGlobalValues: test_values))
  let (state_result, _) = try! #UseOkResult(runtime.run())

  #expect(state_result == P4Lang.accept)
}