using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace DCIT.Core.Models
{
    public class RuleDefinition : INotifyPropertyChanged
    {
        private string _id;
        private string _name;
        private bool _isEnabled = true;
        private RuleMatchMode _matchMode = RuleMatchMode.PlainText;
        private bool _isCaseSensitive;
        private bool _isWholeWord;
        private RuleTarget _target = RuleTarget.DocumentContent;
        private string _searchText;
        private string _replacementText;
        private string _note;

        public string Id
        {
            get { return _id; }
            set { SetField(ref _id, value); }
        }

        public string Name
        {
            get { return _name; }
            set { SetField(ref _name, value); }
        }

        public bool IsEnabled
        {
            get { return _isEnabled; }
            set { SetField(ref _isEnabled, value); }
        }

        public RuleMatchMode MatchMode
        {
            get { return _matchMode; }
            set { SetField(ref _matchMode, value); }
        }

        public RuleTarget Target
        {
            get { return _target; }
            set { SetField(ref _target, value); }
        }

        public bool IsCaseSensitive
        {
            get { return _isCaseSensitive; }
            set { SetField(ref _isCaseSensitive, value); }
        }

        public bool IsWholeWord
        {
            get { return _isWholeWord; }
            set { SetField(ref _isWholeWord, value); }
        }

        public string SearchText
        {
            get { return _searchText; }
            set { SetField(ref _searchText, value); }
        }

        public string ReplacementText
        {
            get { return _replacementText; }
            set { SetField(ref _replacementText, value); }
        }

        public string Note
        {
            get { return _note; }
            set { SetField(ref _note, value); }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected void SetField<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
        {
            if (EqualityComparer<T>.Default.Equals(field, value))
            {
                return;
            }

            field = value;
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    public class RuleFile
    {
        public string Format { get; set; } = "dcit.rule";

        public string Version { get; set; } = "1.0";

        public List<RuleDefinition> Rules { get; set; } = new List<RuleDefinition>();
    }

    public class RuleValidationIssue
    {
        public RuleValidationSeverity Severity { get; set; }

        public int Index { get; set; }

        public string RuleId { get; set; }

        public string RuleName { get; set; }

        public string Message { get; set; }
    }

    public class RuleValidationReport
    {
        public List<RuleValidationIssue> Issues { get; } = new List<RuleValidationIssue>();

        public bool HasErrors
        {
            get { return Issues.Exists(item => item.Severity == RuleValidationSeverity.Error); }
        }
    }
}