using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml;

namespace Neo.Afx.Services.Workflows.Entities
{
    /// <summary>
    /// Workflow Instance Route class definition
    /// </summary>
    public class WorkflowInstanceRoute
    {
        private List<WorkflowRouteStep> _steps;

        /// <summary>
        /// Initializes a new instance of the <see cref="WorkflowInstanceRoute"/> class.
        /// </summary>
        /// <param name="xml">The XML.</param>
        public WorkflowInstanceRoute(XmlDocument xml)
        {
            _steps = new List<WorkflowRouteStep>();

            var routeLayout = xml.SelectSingleNode("/WorkflowRoute/WorkflowLayout");
            if (routeLayout != null)
            {
                RouteLayout = new WorkflowRouteLayout(routeLayout);
            }

            var steps = xml.SelectNodes("/WorkflowRoute/Steps/Step");
            if(steps != null)
            {
                foreach(XmlNode step in steps)
                {
                    var s = new WorkflowRouteStep()
                    {
                        Number = Convert.ToInt32(step.Attributes["Number"].Value),
                        Status = step.Attributes["WorkflowTemplateStepStatus"].Value,
                        Users = new List<WorkflowRouteUser>(),
                        WorkflowTemplateStepID = Convert.ToInt32(step.Attributes["WorkflowTemplateStepID"].Value),
                        ParticipantRoles = step.Attributes["ParticipantRoles"].Value,
                        Duration = step.Attributes["Duration"].Value,                        
                    };

                    s.StepTitle = WorkflowInstanceRoute.GetStepTitle(s.Number, RouteLayout);

                    var users = step.SelectNodes("./ToBeAssignedTo/User");

                    if(users != null)
                    {
                        foreach(XmlNode user in users)
                        {
                            var u = new WorkflowRouteUser()
                            {
                                UserID = Convert.ToInt32(user.Attributes["ID"].Value),
                                KnownAs = user.Attributes["KnownAs"].Value
                            };

                            s.Users.Add(u);
                        }
                    }

                    _steps.Add(s);
                }
            }
        }

        public static string GetStepTitle(long number, WorkflowRouteLayout layout)
        {
            if (layout != null && layout.Steps != null)
            {
                foreach (var s in layout.Steps)
                {
                    if (s.Number == number)
                    {
                        return s.Title + " - " + s.Description;
                    }
                }
            }

            return "Step description not found";
        }


        /// <summary>
        /// Gets or sets the route layout.
        /// </summary>
        /// <value>
        /// The route layout.
        /// </value>
        public WorkflowRouteLayout RouteLayout
        {
            get;
            set;
        }

        /// <summary>
        /// Gets or sets the steps.
        /// </summary>
        /// <value>
        /// The steps.
        /// </value>
        public List<WorkflowRouteStep> Steps
        {
            get
            {
                if (_steps != null)
                {
                    return _steps.OrderBy(a => a.Number).ToList();
                }
                else {
                    return new List<WorkflowRouteStep>();
                }
            }           
        }
    }

    /// <summary>
    /// Class used for drawing the Route Indicater
    /// Route Indicater requires a serializable object from an XML source
    /// </summary>
    public class WorkflowRouteLayout
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="WorkflowRouteLayout"/> class.
        /// </summary>
        /// <param name="layout">The layout.</param>
        public WorkflowRouteLayout(XmlNode layout)
        {
            this.MaxColumns = Int32.Parse(layout.Attributes["MaxColumns"].Value);
            this.MaxRows = Int32.Parse(layout.Attributes["MaxRows"].Value);
            this.Steps = new List<WorkflowRouteLayout.Step>();
            this.Links = new List<WorkflowRouteLayout.Link>();

            var steps = layout.SelectNodes("Steps/Step");

            if(steps != null)
            {
                foreach(XmlNode step in steps)
                {
                    var rootLayoutStep = new WorkflowRouteLayout.Step()
                    {
                        Column = Int32.Parse(step.Attributes["Column"].Value),
                        Description = step.Attributes["Description"].Value,
                        Number = Int32.Parse(step.Attributes["Number"].Value),
                        Row = Int32.Parse(step.Attributes["Row"].Value),
                        Title = step.Attributes["Title"].Value
                    };

                    this.Steps.Add(rootLayoutStep);
                }
            }

            var links = layout.SelectNodes("Links/Link");
            if(links != null)
            {
                foreach(XmlNode link in links)
                {
                    var routeLink = new WorkflowRouteLayout.Link()
                    {
                        FromStep = Int32.Parse(link.Attributes["FromStep"].Value),
                        ToStep = Int32.Parse(link.Attributes["ToStep"].Value)
                    };

                    this.Links.Add(routeLink);
                }
            }
        }

        /// <summary>
        /// Gets or sets the max columns.
        /// </summary>
        /// <value>
        /// The max columns.
        /// </value>
        public int MaxColumns
        {
            get;
            set;
        }

        /// <summary>
        /// Gets or sets the max rows.
        /// </summary>
        /// <value>
        /// The max rows.
        /// </value>
        public int MaxRows
        {
            get;
            set;
        }

        /// <summary>
        /// Gets or sets the steps.
        /// </summary>
        /// <value>
        /// The steps.
        /// </value>
        public List<Step> Steps
        {
            get;
            set;
        }
        /// <summary>
        /// Gets or sets the links.
        /// </summary>
        /// <value>
        /// The links.
        /// </value>
        public List<Link> Links
        {
            get;
            set;
        }

        /// <summary>
        /// Route workflow step custom class definition
        /// </summary>
        public class Step
        {
            /// <summary>
            /// Gets or sets the number.
            /// </summary>
            /// <value>
            /// The number.
            /// </value>
            public int Number
            {
                get;
                set;
            }

            /// <summary>
            /// Gets or sets the title.
            /// </summary>
            /// <value>
            /// The title.
            /// </value>
            public string Title
            {
                get;
                set;
            }

            /// <summary>
            /// Gets or sets the description.
            /// </summary>
            /// <value>
            /// The description.
            /// </value>
            public string Description
            {
                get;
                set;
            }

            /// <summary>
            /// Gets or sets the row.
            /// </summary>
            /// <value>
            /// The row.
            /// </value>
            public int Row
            {
                get;
                set;
            }

            /// <summary>
            /// Gets or sets the column.
            /// </summary>
            /// <value>
            /// The column.
            /// </value>
            public int Column
            {
                get;
                set;
            }

        }

        /// <summary>
        /// Route workflow link custom class definition
        /// </summary>
        public class Link
        {
            /// <summary>
            /// Gets or sets from step.
            /// </summary>
            /// <value>
            /// From step.
            /// </value>
            public int FromStep
            {
                get;
                set;
            }

            /// <summary>
            /// Gets or sets to step.
            /// </summary>
            /// <value>
            /// To step.
            /// </value>
            public int ToStep
            {
                get;
                set;
            }
        }
    }

    /// <summary>
    /// Workflow Route Step class definition
    /// </summary>
    public class WorkflowRouteStep
    {
        /// <summary>
        /// Gets or sets the workflow template step ID.
        /// </summary>
        /// <value>
        /// The workflow template step ID.
        /// </value>
        public long WorkflowTemplateStepID
        {
            get;
            set;
        }

        /// <summary>
        /// Gets or sets the number.
        /// </summary>
        /// <value>
        /// The number.
        /// </value>
        public long Number
        {
            get;
            set;
        }

        /// <summary>
        /// Gets or sets the duration.
        /// </summary>
        /// <value>
        /// The duration.
        /// </value>
        public string Duration
        {
            get;
            set;
        }

        /// <summary>
        /// Gets or sets the status.
        /// </summary>
        /// <value>
        /// The status.
        /// </value>
        public string Status
        {
            get;
            set;
        }

        /// <summary>
        /// Gets or sets the users.
        /// </summary>
        /// <value>
        /// The users.
        /// </value>
        public List<WorkflowRouteUser> Users
        {
            get;
            set;
        }

        /// <summary>
        /// Gets or sets the participant roles.
        /// </summary>
        /// <value>
        /// The participant roles.
        /// </value>
        public string ParticipantRoles
        {
            get;
            set;
        }

        /// <summary>
        /// Gets or sets the step title
        /// </summary>
        public string StepTitle { get; set; }
    }

    /// <summary>
    /// Workflow Route User class definition
    /// </summary>
    public class WorkflowRouteUser
    {
        /// <summary>
        /// Gets or sets the user ID.
        /// </summary>
        /// <value>
        /// The user ID.
        /// </value>
        public long UserID
        {
            get;
            set;
        }

        /// <summary>
        /// Gets or sets the known as.
        /// </summary>
        /// <value>
        /// The known as.
        /// </value>
        public string KnownAs
        {
            get;
            set;
        }
    }

}