using Serenity.Data;

using System;

using System.Collections.Generic;

using System.Linq;



namespace Serenity

{

    public class FilterStore

    {

        private EventHandler changed;

        private string displayText;



        public FilterStore(IEnumerable<PropertyItem> fields)

        {

            Items = new List<FilterLine>();



            if (fields == null)

                throw new ArgumentNullException("source");



            this.Fields = fields.ToList();

            this.Fields.Sort((x, y) => Q.Externals.TurkishLocaleCompare(

                Q.TryGetText(x.Title) ?? x.Title ?? x.Name, 

                Q.TryGetText(y.Title) ?? y.Title ?? y.Name));

        

            this.FieldByName = new JsDictionary<string,PropertyItem>();



            foreach (var field in fields)

                FieldByName[field.Name] = field;

        }



        public List<PropertyItem> Fields { get; private set; }

        public JsDictionary<string, PropertyItem> FieldByName { get; private set; }

        public List<FilterLine> Items { get; private set; }



        public void RaiseChanged()

        {

            displayText = null;



            if (changed != null)

                changed(this, EventArgs.Empty);

        }



        public event EventHandler Changed

        {

            add { changed += value; }

            remove { changed -= value; }

        }



        public BaseCriteria ActiveCriteria

        {

            get

            {

                bool inParens = false;

                BaseCriteria currentBlock = Criteria.Empty;

                bool isBlockOr = false;

                BaseCriteria activeCriteria = Criteria.Empty;



                for (int i = 0; i < Items.Count; i++)

                {

                    var line = Items[i];



                    if (inParens && (line.RightParen || line.LeftParen))

                    {

                        if (!currentBlock.IsEmpty)

                        {

                            if (isBlockOr)

                                activeCriteria |= ~(currentBlock);

                            else

                                activeCriteria &= ~(currentBlock);



                            currentBlock = Criteria.Empty;

                        }



                        inParens = false;

                    }



                    if (line.LeftParen)

                    {

                        isBlockOr = line.IsOr;

                        inParens = true;

                    }



                    if (line.IsOr)

                        currentBlock |= line.Criteria;

                    else

                        currentBlock &= line.Criteria;

                }



                if (!currentBlock.IsEmpty)

                {

                    if (isBlockOr)

                        activeCriteria |= ~(currentBlock);

                    else

                        activeCriteria &= ~(currentBlock);

                }



                return activeCriteria;

            }

        }



        public string DisplayText

        {

            get

            {

                if (displayText == null)

                {

                    bool inParens = false;

                    displayText = "";



                    for (int i = 0; i < Items.Count; i++)

                    {

                        var line = Items[i];



                        if (inParens && (line.RightParen || line.LeftParen))

                        {

                            displayText += ")";

                            inParens = false;

                        }



                        if (displayText.Length > 0)

                            displayText += " " + Q.Text("Controls.FilterPanel." + (line.IsOr ? "Or" : "And")) + " ";



                        if (line.LeftParen)

                        {

                            displayText += "(";

                            inParens = true;

                        }



                        displayText += line.DisplayText;

                    }

                }



                return displayText;

            }

        }

    }

}