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

@testable import Common

@Test func test_preprocessor() async throws {
  let sm = SourceManager(["./TestData/Sources/"])
  let prep = SourceCodePreprocessor(sm)
  let file = FilePath.init(stringLiteral: "./TestData/Sources/simple.p4")
  let expected_file = FilePath.init(FileManager().currentDirectoryPath + "/" + file.string).lexicallyNormalized()

  let source = try! (#UseOkResult(prep.preprocess(file)))
  let program = try! #UseOkResult(Program.Compile(source.getSource()))
  #expect(#RequireOkResult((program.find_parser(withName: Identifier(name: "main_parser")))))
  #expect(source.getLocations().getPath() == expected_file)
}

@Test func test_preprocessor_search_for_file() async throws {
  let sm = SourceManager(["./TestData/Sources/"])
  let prep = SourceCodePreprocessor(sm)
  let file = FilePath.init(stringLiteral: "simple.p4")
  let expected_file = FilePath.init(FileManager().currentDirectoryPath + "/TestData/Sources/simple.p4")

  let source = try! (#UseOkResult(prep.preprocess(file)))
  let program = try! #UseOkResult(Program.Compile(source.getSource()))
  #expect(#RequireOkResult((program.find_parser(withName: Identifier(name: "main_parser")))))
  #expect(source.getLocations().getPath() == expected_file)
}

@Test func test_preprocessor_nested_includes() async throws {
  let sm = SourceManager(["./TestData/Sources/"])
  let prep = SourceCodePreprocessor(sm)
  let file = FilePath.init(stringLiteral: "./TestData/Sources/simple-split.p4")
  let expected_file = FilePath.init(FileManager().currentDirectoryPath + "/" + file.string).lexicallyNormalized()

  #expect(#RequireOkResult(prep.preprocess(file)))

  let source = try! (#UseOkResult(prep.preprocess(file)))
  let program = try! #UseOkResult(Program.Compile(source.getSource()))
  #expect(#RequireOkResult((program.find_parser(withName: Identifier(name: "main_parser")))))
  #expect(source.getLocations().getPath() == expected_file)
}

@Test func test_preprocessor_oneline_includes() async throws {
  let sm = SourceManager(["./TestData/Sources/"])
  let prep = SourceCodePreprocessor(sm)
  let file = FilePath.init(stringLiteral: "./TestData/Sources/simple-split-oneline.p4")
  let expected_file = FilePath.init(FileManager().currentDirectoryPath + "/" + file.string).lexicallyNormalized()

  #expect(#RequireOkResult(prep.preprocess(file)))

  let source = try! (#UseOkResult(prep.preprocess(file)))
  let program = try! #UseOkResult(Program.Compile(source.getSource()))
  #expect(#RequireOkResult((program.find_parser(withName: Identifier(name: "main_parser")))))
  #expect(source.getLocations().getPath() == expected_file)
}

@Test func test_preprocessor_missing_file() async throws {
  let sm = SourceManager(["./TestData/Sources/"])
  let prep = SourceCodePreprocessor(sm)
  let file = FilePath.init(stringLiteral: "./TestData/Sources/unfound.p4")

  #expect(
    #RequireErrorResult(
      Error(withMessage: "Could not open ./TestData/Sources/unfound.p4 for preprocessing"),
      (prep.preprocess(file))))

}

@Test func test_preprocessor_missing_included_file() async throws {
  let sm = SourceManager(["./TestData/Sources/"])
  let prep = SourceCodePreprocessor(sm)
  let file = FilePath.init(stringLiteral: "./TestData/Sources/simple-unfound.p4")

  #expect(
    #RequireErrorResult(
      Error(withMessage: "Could not open unfound.p4 for inclusion"), (prep.preprocess(file))))

}

@Test func test_preprocessor_no_change_locations() async throws {
  let sm = SourceManager(["./TestData/Sources/"])
  let prep = SourceCodePreprocessor(sm)
  let file = FilePath.init(stringLiteral: "testing.p4")

  let source = try! (#UseOkResult(prep.preprocess(file)))

  #expect(source.getLocations().getLocation() == SourceLocation(0..<173))
}

@Test func test_preprocessor_change_locations() async throws {
  let sm = SourceManager(["./TestData/Sources/"])
  let prep = SourceCodePreprocessor(sm)
  let file = FilePath.init(stringLiteral: "testing-split-a.p4")

  let source = try! (#UseOkResult(prep.preprocess(file)))

  #expect(source.getLocations().getLocation() == SourceLocation(0..<173))
  #expect(source.getLocations().getNestedLocations()[0].getLocation() == SourceLocation(48..<173))
}

@Test func test_preprocessor_oneline_includes_locations() async throws {
  let sm = SourceManager(["./TestData/Sources/"])
  let prep = SourceCodePreprocessor(sm)
  let file = FilePath.init(stringLiteral: "./TestData/Sources/simple-split-oneline.p4")

  #expect(#RequireOkResult(prep.preprocess(file)))

  let source = try! (#UseOkResult(prep.preprocess(file)))

  #expect(source.getLocations().getLocation() == SourceLocation(0..<173))
  #expect(source.getLocations().getNestedLocations()[0].getLocation() == SourceLocation(0..<70))
  #expect(source.getLocations().getNestedLocations()[1].getLocation() == SourceLocation(70..<173))
}

@Test func test_preprocessor_nested_includes_locations() async throws {
  let sm = SourceManager(["./TestData/Sources/"])
  let prep = SourceCodePreprocessor(sm)
  let file = FilePath.init(stringLiteral: "./TestData/Sources/nested-split.p4")

  #expect(#RequireOkResult(prep.preprocess(file)))

  let source = try! (#UseOkResult(prep.preprocess(file)))

  #expect(source.getLocations().getLocation() == SourceLocation(0..<173))
  #expect(
    source.getLocations().getNestedLocations()[0].getNestedLocations()[0].getLocation()
      == SourceLocation(27..<47))
  #expect(
    source.getLocations().getNestedLocations()[0].getNestedLocations()[1].getLocation()
      == SourceLocation(48..<166))
}


@Test func test_source_location_contains() async throws {
  let outer = SourceLocation(0..<500)
  let inner = SourceLocation(0..<499)

  #expect(outer.contains(inner))
}

@Test func test_source_location_contains_a() async throws {
  let outer = SourceLocation(0, 500)
  let inner = SourceLocation(0, 499)

  #expect(outer.contains(inner))
}

@Test func test_source_location_contains2() async throws {
  let outer = SourceLocation(0..<500)
  let not_inner = SourceLocation(0..<501)

  #expect(!outer.contains(not_inner))
}

@Test func test_source_location_contains2_a() async throws {
  let outer = SourceLocation(0,500)
  let not_inner = SourceLocation(0,501)

  #expect(!outer.contains(not_inner))
}

@Test func test_source_location_contains3() async throws {
  let outer = SourceLocation(200..<500)
  let inner = SourceLocation(200..<499)

  #expect(outer.contains(inner))
}

@Test func test_source_location_contains3_a() async throws {
  let outer = SourceLocation(200,300)
  let inner = SourceLocation(200,299)

  #expect(outer.contains(inner))
}

@Test func test_source_location_contains4() async throws {
  let outer = SourceLocation(200..<500)
  let inner = SourceLocation(200, 299)

  #expect(outer.contains(inner))
}

@Test func test_source_location_contains5() async throws {
  let outer = SourceLocation(200..<300)
  let not_inner = SourceLocation(200,101)

  #expect(!outer.contains(not_inner))
}