import 'package:aoc2020/aocbase.dart';
import 'package:aoc2020/model/readdata.dart';

typedef Validator = bool Function(String);

class AOC20201204 extends AOCBase {
  static const List<String> eyeColors = ['amb', 'blu', 'brn', 'gry', 'grn', 'hzl', 'oth'];
  // cid field is assume to be last
  List<String> fields = ['byr', 'iyr', 'eyr', 'hgt', 'hcl', 'ecl', 'pid', 'cid'];
  Map<String, Validator> valid1 = {
    'byr': (val) => true,
    'iyr': (val) => true,
    'eyr': (val) => true,
    'hgt': (val) => true,
    'hcl': (val) => true,
    'ecl': (val) => true,
    'pid': (val) => true,
    'cid': (val) => true,
  };
  Map<String, Validator> valid2 = {
    'byr': (val) => (val.length == 4 && int.parse(val) >= 1920 && int.parse(val) <= 2002),
    'iyr': (val) => (val.length == 4 && int.parse(val) >= 2010 && int.parse(val) <= 2020),
    'eyr': (val) => (val.length == 4 && int.parse(val) >= 2020 && int.parse(val) <= 2030),
    'hgt': (val) {
      var units = val.substring(val.length - 2);
      var height = int.parse(val.substring(0, val.length - 2));
      if (units == 'cm') {
        return height >= 150 && height <= 193;
      } else {
        return height >= 59 && height <= 76;
      }
    },
    'hcl': (val) {
      var regExp = RegExp(r'^#([a-fA-F0-9]{6})', caseSensitive: false, multiLine: false);
      return regExp.hasMatch(val);
    },
    'ecl': (val) => eyeColors.contains(val),
    'pid': (val) {
      var regExp = RegExp(r'^([0-9]{9})$', caseSensitive: false, multiLine: false);
      return regExp.hasMatch(val);
    },
    'cid': (val) => true,
  };

  bool validate(Map<String, String> passport, Map<String, Validator> validatorFn) {
    for (var field in fields) {
      if (field != fields.last && passport[field] == null) {
        return false;
      } else {
        if (!validatorFn[field](passport[field])) {
          return false;
        }
      }
    }
    return true;
  }

  int processList({List<String> input, Map<String, Validator> validatorFn}) {
    var retval = 0;
    var passport = <String, String>{};
    for (var line in input) {
      if (line.isEmpty) {
        retval += validate(passport, validatorFn) ? 1 : 0;
        passport = <String, String>{};
      } else {
        var fieldItems = line.split(' ');
        for (var item in fieldItems) {
          var itemSplit = item.split(':');
          passport[itemSplit[0]] = itemSplit[1];
        }
      }
    }
    retval += validate(passport, validatorFn) ? 1 : 0;
    return retval;
  }

  @override
  Future<void> a({bool test}) async {
    var mylist = await ReadData.readFile<String>(classString, test: test);
    answerA = processList(input: mylist, validatorFn: valid1);
  }

  @override
  Future<void> b({bool test}) async {
    var mylist = await ReadData.readFile<String>(classString, test: test);
    answerB = processList(input: mylist, validatorFn: valid2);
  }
}