using System;
using System.Linq;
using System.Security.Cryptography;
using UnityEditor.Connect;
using UnityEditor.Web;
using UnityEngine;

#if UNITY_2019_1_OR_NEWER
using UnityEngine.UIElements;
#else
using UnityEngine.Experimental.UIElements;
using UnityEngine.Experimental.UIElements.StyleEnums;
#endif

namespace UnityEditor.Collaboration
{
    internal class CollabHistoryItem : VisualElement
    {
        public static RevisionAction s_OnRestore;
        public static RevisionAction s_OnGoBack;
        public static RevisionAction s_OnUpdate;
        public static ShowBuildAction s_OnShowBuild;
        public static Action s_OnShowServices;

        private readonly string m_RevisionId;
        private readonly string m_FullDescription;
        private readonly DateTime m_TimeStamp;
        private readonly Button m_Button;
        private readonly HistoryProgressSpinner m_ProgressSpinner;
        private VisualElement m_ActionsTray;
        private VisualElement m_Details;
        private Label m_Description;
        private Label m_TimeAgo;
        private readonly Button m_ExpandCollapseButton;
        private bool m_Expanded;

        private const int kMaxDescriptionChars = 500;

        public bool RevisionActionsEnabled
        {
            set
            {
                m_Button.SetEnabled(value);
            }
        }

        public DateTime timeStamp
        {
            get { return m_TimeStamp; }
        }

        public CollabHistoryItem(RevisionData data)
        {
            m_RevisionId = data.id;
            m_TimeStamp = data.timeStamp;
            name = "HistoryItem";
            m_ActionsTray = new VisualElement {name = "HistoryItemActionsTray"};
            m_ProgressSpinner = new HistoryProgressSpinner();
            m_Details = new VisualElement {name = "HistoryDetail"};
            var author = new Label(data.authorName) {name = "Author"};
            m_TimeAgo = new Label(TimeAgo.GetString(m_TimeStamp));
            m_FullDescription = data.comment;
            var shouldTruncate = ShouldTruncateDescription(m_FullDescription);
            if (shouldTruncate)
            {
                m_Description = new Label(GetTruncatedDescription(m_FullDescription));
            }
            else
            {
                m_Description = new Label(m_FullDescription);
            }
            m_Description.name = "RevisionDescription";
            var dropdown = new CollabHistoryDropDown(data.changes, data.changesTotal, data.changesTruncated, data.id);
            if (data.current)
            {
                m_Button = new Button(Restore) {name = "ActionButton", text = "Restore"};
            }
            else if (data.obtained)
            {
                m_Button = new Button(GoBackTo) {name = "ActionButton", text = "Go back to..."};
            }
            else
            {
                m_Button = new Button(UpdateTo) {name = "ActionButton", text = "Update"};
            }
            m_Button.SetEnabled(data.enabled);
            m_ProgressSpinner.ProgressEnabled = data.inProgress;

            m_ActionsTray.Add(m_ProgressSpinner);
            m_ActionsTray.Add(m_Button);

            m_Details.Add(author);
            m_Details.Add(m_TimeAgo);
            m_Details.Add(m_Description);

            if (shouldTruncate)
            {
                m_ExpandCollapseButton = new Button(ToggleDescription) { name = "ToggleDescription", text = "Show More" };
                m_Details.Add(m_ExpandCollapseButton);
            }

            if (data.buildState != BuildState.None)
            {
                BuildStatusButton buildButton;
                if (data.buildState == BuildState.Configure)
                    buildButton = new BuildStatusButton(ShowServicePage);
                else
                    buildButton = new BuildStatusButton(ShowBuildForCommit, data.buildState, data.buildFailures);

                m_Details.Add(buildButton);
            }

            m_Details.Add(m_ActionsTray);
            m_Details.Add(dropdown);

            Add(m_Details);

            this.schedule.Execute(UpdateTimeAgo).Every(1000 * 20);
        }

        public static void SetUpCallbacks(RevisionAction Restore, RevisionAction GoBack, RevisionAction Update)
        {
            s_OnRestore = Restore;
            s_OnGoBack = GoBack;
            s_OnUpdate = Update;
        }

        public void SetInProgressStatus(string revisionIdInProgress)
        {
            if (String.IsNullOrEmpty(revisionIdInProgress))
            {
                m_Button.SetEnabled(true);
                m_ProgressSpinner.ProgressEnabled = false;
            }
            else
            {
                m_Button.SetEnabled(false);
                if (m_RevisionId.Equals(revisionIdInProgress))
                {
                    m_ProgressSpinner.ProgressEnabled = true;
                }
            }
        }

        void ShowBuildForCommit()
        {
            CollabAnalytics.SendUserAction(CollabAnalytics.historyCategoryString, "ShowBuild");
            if (s_OnShowBuild != null)
            {
                s_OnShowBuild(m_RevisionId);
            }
        }

        void ShowServicePage()
        {
            CollabAnalytics.SendUserAction(CollabAnalytics.historyCategoryString, "ShowServices");
            if (s_OnShowServices != null)
            {
                s_OnShowServices();
            }
        }

        void Restore()
        {
            CollabAnalytics.SendUserAction(CollabAnalytics.historyCategoryString, "Restore");
            if (s_OnRestore != null)
            {
                s_OnRestore(m_RevisionId, false);
            }
        }

        void GoBackTo()
        {
            CollabAnalytics.SendUserAction(CollabAnalytics.historyCategoryString, "GoBackTo");
            if (s_OnGoBack != null)
            {
                s_OnGoBack(m_RevisionId, false);
            }
        }

        void UpdateTo()
        {
            CollabAnalytics.SendUserAction(CollabAnalytics.historyCategoryString, "Update");
            if (s_OnUpdate != null)
            {
                s_OnUpdate(m_RevisionId, true);
            }
        }

        void UpdateTimeAgo()
        {
            m_TimeAgo.text = TimeAgo.GetString(m_TimeStamp);
        }

        bool ShouldTruncateDescription(string description)
        {
            return description.Contains(Environment.NewLine) || description.Length > kMaxDescriptionChars;
        }

        string GetTruncatedDescription(string description)
        {
            string result = description.Contains(Environment.NewLine) ?
                description.Substring(0, description.IndexOf(Environment.NewLine)) : description;
            if (result.Length > kMaxDescriptionChars)
            {
                result = result.Substring(0, kMaxDescriptionChars) + "...";
            }
            return result;
        }

        void ToggleDescription()
        {
            if (m_Expanded)
            {
                CollabAnalytics.SendUserAction(CollabAnalytics.historyCategoryString, "CollapseDescription");
                m_Expanded = false;
                m_ExpandCollapseButton.text = "Show More";
                m_Description.text = GetTruncatedDescription(m_FullDescription);
            }
            else
            {
                CollabAnalytics.SendUserAction(CollabAnalytics.historyCategoryString, "ExpandDescription");
                m_Expanded = true;
                m_ExpandCollapseButton.text = "Show Less";
                m_Description.text = m_FullDescription;
            }
        }
    }
}