using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

[assembly: WebResource("ChadSoft.Web.Controls.FormCopier.js", "text/javascript")]
namespace ChadSoft.Web.Controls
{
    /// <summary>
    /// Used to create mappings between form input elements to
    /// allow dynamic synchronization (e.g. "Same as Billing Address")
    /// </summary>
    public class FormCopier : Control
    {
        private const string AddMappingFormat = "{0}.AddMapping(document.getElementById('{1}'), document.getElementById('{2}'));\n";

        /// <summary>
        /// Gets or sets a value indicating whether [same as associated].
        /// </summary>
        /// <value><c>true</c> if [same as associated]; otherwise, <c>false</c>.</value>
        public bool SameAsAssociated
        {
            get
            {
                object sameAsAssociated = ViewState["SameAsAssociated"];
                if (sameAsAssociated != null)
                    return (bool)sameAsAssociated;
                else
                    return true;
            }
            set { ViewState["SameAsAssociated"] = value; }
        }

        protected override void OnLoad(EventArgs e)
        {
            // Register the associated FormCopier script
            Page.ClientScript.RegisterClientScriptResource(
                typeof(FormCopier), "ChadSoft.Web.Controls.FormCopier.js");
        }
        protected override void Render(HtmlTextWriter writer)
        {
            // Build and register init script
            string scriptName = String.Format("PopulateMappings_{0}", ClientID);
            string initScript = BuildInitScript();
            Page.ClientScript.RegisterStartupScript(typeof(FormCopier), scriptName, initScript, true);
        }

        protected string BuildInitScript()
        {
            StringBuilder script = new StringBuilder();

            // Create the formCopier variable
            script.AppendFormat("var {0} = new ChadSoft.Web.Controls.FormCopier();\n", this.ClientID);

            // Add all of the mappings
            foreach (string controlId in ControlMappings.Keys)
            {
                script.AppendFormat(AddMappingFormat, this.ClientID, controlId, ControlMappings[controlId]);
            }

            script.AppendFormat("{0}.SetSameAsAssociated({1});\n", this.ClientID, this.SameAsAssociated.ToString().ToLower());

            return script.ToString();
        }

        public Dictionary<string, string> ControlMappings
        {
            get
            {
                object controlMappings = ViewState["ControlMappings"];
                if (controlMappings == null)
                {
                    controlMappings = new Dictionary<string, string>();
                    ViewState["ControlMappings"] = controlMappings;
                }

                return (Dictionary<string, string>)controlMappings;
            }
        }

        public string AddMapping(string sourceID, string destinationID)
        {
            if (String.IsNullOrEmpty(sourceID))
                throw new ArgumentNullException("sourceID");
            if (String.IsNullOrEmpty(destinationID))
                throw new ArgumentNullException("destinationID");

            ControlMappings[sourceID] = destinationID;

            return sourceID;
        }
        public string AddMapping(HtmlInputControl source, HtmlInputControl destination)
        {
            if (source == null)
                throw new ArgumentNullException("source");
            if (destination == null)
                throw new ArgumentNullException("destination");

            return AddMapping(source.ClientID, destination.ClientID);
        }
        public string AddMapping(WebControl source, WebControl destination)
        {
            if (source == null)
                throw new ArgumentNullException("source");
            if (destination == null)
                throw new ArgumentNullException("destination");

            return AddMapping(source.ClientID, destination.ClientID);
        }

        public void RemoveMapping(HtmlInputControl source) { RemoveMapping(source.ClientID); }
        public void RemoveMapping(string sourceID) { ControlMappings.Remove(sourceID); }

        public void Clear() { ControlMappings.Clear(); }
    }
}