import 'package:rimworld_modman/mod.dart';
import 'package:rimworld_modman/mod_list.dart';
import 'package:test/test.dart';

const root = r'C:/Users/Administrator/Seafile/Games-RimWorld';
const modsRoot = '$root/294100';
const configRoot = '$root/AppData/RimWorld by Ludeon Studios/Config';
const configPath = '$configRoot/ModsConfig.xml';
const logsPath = '$root/ModManager';

Map<String, Mod> generateDummyMods() {
  final dummyMod = Mod(
    name: 'Dummy Mod',
    id: 'dummy',
    path: '',
    versions: ["1.5"],
    description: '',
    dependencies: [],
    loadAfter: [],
    loadBefore: [],
    incompatibilities: [],
    size: 0,
    isBaseGame: false,
    isExpansion: false,
    enabled: false,
  );

  final dummyMods = {
    'harmony': dummyMod.copyWith(
      name: 'Harmony',
      id: 'harmony',
      loadBefore: ["ludeon.rimworld"],
      size: 47,
    ),
    'prepatcher': dummyMod.copyWith(
      name: 'Prepatcher',
      id: 'prepatcher',
      loadAfter: ["ludeon.rimworld"],
      dependencies: ["harmony"],
      size: 47,
    ),
    'ludeon.rimworld': dummyMod.copyWith(
      name: 'RimWorld',
      id: 'ludeon.rimworld',
      isBaseGame: true,
    ),
    'ludeon.rimworld.anomaly': dummyMod.copyWith(
      name: 'RimWorld Anomaly',
      id: 'ludeon.rimworld.anomaly',
      isExpansion: true,
    ),
    'disabledDummy': dummyMod.copyWith(
      name: 'Disabled Dummy',
      id: 'disabledDummy',
    ),
    'yuuuge': dummyMod.copyWith(name: 'Yuuuge', id: 'yuuuge', size: 1000000),
    'smol': dummyMod.copyWith(name: 'Smol', id: 'smol', size: 1),
    'incompatible': dummyMod.copyWith(
      name: 'Incompatible',
      id: 'incompatible',
      size: 1,
      incompatibilities: ['harmony'],
    ),
  };

  return dummyMods;
}

void main() {
  final dummyMods = generateDummyMods();
  final dummyList = ModList();
  dummyList.mods = dummyMods;
  dummyList.enableAll();
  dummyList.setEnabled('disabledDummy', false);
  dummyList.setEnabled('incompatible', false);
  final sortedMods = dummyList.generateLoadOrder();

  group('Test sorting', () {
    test('Harmony should load before RimWorld', () {
      final harmonyIndex = sortedMods.indexOf('harmony');
      final rimworldIndex = sortedMods.indexOf('ludeon.rimworld');
      expect(harmonyIndex, lessThan(rimworldIndex));
    });

    test('Prepatcher should load after Harmony and RimWorld', () {
      final prepatcherIndex = sortedMods.indexOf('prepatcher');
      final harmonyIndex = sortedMods.indexOf('harmony');
      final rimworldIndex = sortedMods.indexOf('ludeon.rimworld');
      expect(prepatcherIndex, greaterThan(harmonyIndex));
      expect(prepatcherIndex, greaterThan(rimworldIndex));
    });

    test('RimWorld should load before Anomaly', () {
      final rimworldIndex = sortedMods.indexOf('ludeon.rimworld');
      final anomalyIndex = sortedMods.indexOf('ludeon.rimworld.anomaly');
      expect(rimworldIndex, lessThan(anomalyIndex));
    });

    test('Disabled dummy mod should not be loaded', () {
      final disabledIndex = sortedMods.indexOf('disabledDummy');
      expect(disabledIndex, isNegative);
    });

    test('Larger mods should load before smaller ones', () {
      final smolIndex = sortedMods.indexOf('smol');
      final yuuugeIndex = sortedMods.indexOf('yuuuge');
      expect(yuuugeIndex, lessThan(smolIndex));
    });

    test('Incompatible mods should throw exception', () {
      dummyList.setEnabled('incompatible', true);
      expect(() => dummyList.generateLoadOrder(), throwsException);
    });
  });

  final dummyMods2 = generateDummyMods();
  final dummyList2 = ModList();
  dummyList2.mods = dummyMods2;
  dummyList2.disableAll();
  dummyList2.setEnabled('prepatcher', true);
  final sortedMods2 = dummyList2.loadRequired();

  group('Test loadRequired', () {
    test('Dependencies should be automatically enabled', () {
      final harmonyIndex = sortedMods2.indexOf('harmony');
      expect(harmonyIndex, isNot(-1));
    });

    test('Only required mods should be enabled', () {
      for (final mod in dummyMods2.keys) {
        if (mod != 'prepatcher' && mod != 'harmony') {
          expect(sortedMods2.indexOf(mod), isNegative);
        }
      }
    });

    test('Incompatible mods should throw exception', () {
      dummyList2.setEnabled('incompatible', true);
      expect(() => dummyList2.loadRequired(), throwsException);
    });
  });

  group('Test cyclic dependencies', () {
    test('Cyclic dependencies should throw exception', () {
      final cyclicMods = generateDummyMods();
      // Create a cyclic dependency: A -> B -> C -> A
      cyclicMods['modA'] = cyclicMods['smol']!.copyWith(
        name: 'Mod A',
        id: 'modA',
        dependencies: ['modB'],
      );
      cyclicMods['modB'] = cyclicMods['smol']!.copyWith(
        name: 'Mod B',
        id: 'modB',
        dependencies: ['modC'],
      );
      cyclicMods['modC'] = cyclicMods['smol']!.copyWith(
        name: 'Mod C',
        id: 'modC',
        dependencies: ['modA'],
      );

      final list = ModList();
      list.mods = cyclicMods;
      list.enableAll();

      expect(() => list.generateLoadOrder(), throwsException);
    });
  });

  group('Test soft constraints', () {
    test('Load preferences should be respected when possible', () {
      final softConstraintMods = generateDummyMods();
      softConstraintMods['modA'] = softConstraintMods['smol']!.copyWith(
        name: 'Mod A',
        id: 'modA',
        loadAfter: ['modB'],
        loadBefore: ['modC'],
      );
      softConstraintMods['modB'] = softConstraintMods['smol']!.copyWith(
        name: 'Mod B',
        id: 'modB',
      );
      softConstraintMods['modC'] = softConstraintMods['smol']!.copyWith(
        name: 'Mod C',
        id: 'modC',
      );

      final list = ModList();
      list.mods = softConstraintMods;
      list.enableAll();
      final order = list.generateLoadOrder();

      final aIndex = order.indexOf('modA');
      final bIndex = order.indexOf('modB');
      final cIndex = order.indexOf('modC');

      expect(aIndex, greaterThan(bIndex));
      expect(aIndex, lessThan(cIndex));
    });
  });

  group('Test conflict detection', () {
    test('All conflicts should be correctly identified', () {
      final incompatibleMods = generateDummyMods();
      incompatibleMods['modA'] = incompatibleMods['smol']!.copyWith(
        name: 'Mod A',
        id: 'modA',
        incompatibilities: ['modB', 'modC'],
      );
      incompatibleMods['modB'] = incompatibleMods['smol']!.copyWith(
        name: 'Mod B',
        id: 'modB',
      );
      incompatibleMods['modC'] = incompatibleMods['smol']!.copyWith(
        name: 'Mod C',
        id: 'modC',
      );

      final list = ModList();
      list.mods = incompatibleMods;
      list.enableAll();

      final conflicts = list.checkIncompatibilities();
      expect(conflicts.length, equals(2));

      // Check if conflicts contain these pairs (order doesn't matter)
      expect(
        conflicts.any(
          (c) =>
              (c[0] == 'modA' && c[1] == 'modB') ||
              (c[0] == 'modB' && c[1] == 'modA'),
        ),
        isTrue,
      );
      expect(
        conflicts.any(
          (c) =>
              (c[0] == 'modA' && c[1] == 'modC') ||
              (c[0] == 'modC' && c[1] == 'modA'),
        ),
        isTrue,
      );
    });
  });

  group('Test enable/disable functionality', () {
    test('Enable and disable methods should work correctly', () {
      final testMods = generateDummyMods();
      final list = ModList();
      list.mods = testMods;

      list.enableAll();
      for (final mod in list.mods.values) {
        expect(mod.enabled, isTrue);
      }

      list.disableAll();
      for (final mod in list.mods.values) {
        expect(mod.enabled, isFalse);
      }
    });
  });

  group('Test base game and expansion handling', () {
    test('Base game and expansions should be correctly ordered', () {
      final gameMods = generateDummyMods();
      final list = ModList();
      list.mods = gameMods;
      list.enableAll();
      list.setEnabled('incompatible', false); // Avoid exception

      final order = list.generateLoadOrder();

      // Base game should load before any expansions
      final baseGameIndex = order.indexOf('ludeon.rimworld');
      final expansionIndex = order.indexOf('ludeon.rimworld.anomaly');
      expect(baseGameIndex, lessThan(expansionIndex));

      // Normal mods should come after base game (except harmony)
      for (final modId in order) {
        if (modId != 'ludeon.rimworld' &&
            modId != 'harmony' &&
            !modId.startsWith('ludeon.rimworld.')) {
          expect(order.indexOf(modId), greaterThan(baseGameIndex));
        }
      }
    });
  });

  group('Test complex dependency chains', () {
    test('Complex dependency chains should resolve correctly', () {
      final complexMods = generateDummyMods();
      // Create a chain: A -> B -> C -> D
      complexMods['modA'] = complexMods['smol']!.copyWith(
        name: 'Mod A',
        id: 'modA',
        dependencies: ['modB'],
      );
      complexMods['modB'] = complexMods['smol']!.copyWith(
        name: 'Mod B',
        id: 'modB',
        dependencies: ['modC'],
      );
      complexMods['modC'] = complexMods['smol']!.copyWith(
        name: 'Mod C',
        id: 'modC',
        dependencies: ['modD'],
      );
      complexMods['modD'] = complexMods['smol']!.copyWith(
        name: 'Mod D',
        id: 'modD',
      );

      final list = ModList();
      list.mods = complexMods;
      list.disableAll();
      list.setEnabled('modA', true);

      final result = list.loadRequired();

      // All mods in the chain should be enabled
      expect(result.contains('modA'), isTrue);
      expect(result.contains('modB'), isTrue);
      expect(result.contains('modC'), isTrue);
      expect(result.contains('modD'), isTrue);

      // The order should be D -> C -> B -> A
      expect(result.indexOf('modD'), lessThan(result.indexOf('modC')));
      expect(result.indexOf('modC'), lessThan(result.indexOf('modB')));
      expect(result.indexOf('modB'), lessThan(result.indexOf('modA')));
    });
  });

  group('Test constraint prioritization', () {
    test('Hard dependencies should override soft constraints', () {
      final constraintMods = generateDummyMods();
      // A depends on B but wants to load before it (impossible)
      constraintMods['modA'] = constraintMods['smol']!.copyWith(
        name: 'Mod A',
        id: 'modA',
        dependencies: ['modB'],
        loadBefore: ['modB'],
      );
      constraintMods['modB'] = constraintMods['smol']!.copyWith(
        name: 'Mod B',
        id: 'modB',
      );

      final list = ModList();
      list.mods = constraintMods;
      list.enableAll();

      final order = list.generateLoadOrder();

      // Hard dependency must win
      expect(order.indexOf('modB'), lessThan(order.indexOf('modA')));
    });
  });
}