From 2264087322607bbc8b7b62f4275b1c3d8ee0ebb5 Mon Sep 17 00:00:00 2001
From: BOT Alex <44818698+MagicBOTAlex@users.noreply.github.com>
Date: Fri, 14 Jul 2023 04:02:51 +0800
Subject: [PATCH] Added continue learning support!!!

---
 CCharLearn/Pages/Index.razor  | 45 ++++++++++++++++++++-
 CCharLearn/Pages/Learn.razor  | 73 +++++++++++++++++++++++++++++------
 CCharLearn/wwwroot/index.html |  2 +-
 3 files changed, 106 insertions(+), 14 deletions(-)

diff --git a/CCharLearn/Pages/Index.razor b/CCharLearn/Pages/Index.razor
index 32f06fc..476cb34 100644
--- a/CCharLearn/Pages/Index.razor
+++ b/CCharLearn/Pages/Index.razor
@@ -15,7 +15,17 @@
             }
         </MudSelect>
         <MudContainer Class="justify-center d-flex pb-16 pt-4">
-            <MudButton Variant="Variant.Filled" OnClick=StartLearning Color="Color.Primary">Start learning!</MudButton>
+            <MudButton Variant="Variant.Filled" OnClick=StartLearning Color="Color.Primary">@((!continueDataExists) ? "Start learning!" : "Start new!")</MudButton>
+            <MudStack Spacing="0" Class="pa-0 pl-2 ma-0">
+                    <MudButton Variant="Variant.Filled" Color="Color.Success" OnClick="ContinueLearning" Disabled="@(!continueDataExists)">Continue</MudButton>
+                @if (continueDataExists)
+                {
+                    <MudStack Row=true Spacing="0">
+                        <MudText Class="pa-0 ma-0" Typo="Typo.body1">@($"CChars left: {continueCharectersLeft}")</MudText>
+                        <MudIconButton Class="pa-0 ma-0" OnClick="DeleteContinueData" Color="Color.Error" Icon="@Icons.Material.Filled.Close"></MudIconButton>
+                    </MudStack>
+                }
+            </MudStack>
         </MudContainer>
 
         <MudContainer Class="justify-center d-flex">
@@ -63,9 +73,13 @@
     int numOfChunks = 197; //Exclusive index 0
     int selectedChunk = 0;
     int savedChunks = 0;
+    const int chunkSize = 50;
 
     bool isLoading = false;
     bool isSavedLocally = false;
+    bool continueDataExists = false;
+    int continueCharectersLeft = -1;
+
 
     protected async override Task OnInitializedAsync()
     {
@@ -79,9 +93,25 @@
     async void StartLearning()
     {
         await localStorage.SetItemAsync("SelectedChunk", selectedChunk);
+        await localStorage.SetItemAsync("ContinueLearning", false);
         navigator.NavigateTo("/Learn");
     }
 
+    async void ContinueLearning()
+    {
+        await localStorage.SetItemAsync("ContinueLearning", true);
+        navigator.NavigateTo("/Learn");
+    }
+
+    async void DeleteContinueData()
+    {
+        string[] continueDataKeys = { "ContinueLearning", "ContinueData", "ContinueCharectersLeft" };
+        await localStorage.RemoveItemsAsync(continueDataKeys);
+        continueDataExists = false;
+
+        StateHasChanged();
+    }
+
     CChar[]? Charecters;
     async void SelectedChunk()
     {
@@ -142,4 +172,17 @@
         isSavedLocally = true;
         StateHasChanged();
     }
+
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (firstRender)
+        {
+            continueDataExists = await localStorage.ContainKeyAsync("ContinueData");
+        }
+
+        if (continueDataExists)
+        {
+            continueCharectersLeft = await localStorage.GetItemAsync<int>("ContinueCharectersLeft");
+        }
+    }
 }
\ No newline at end of file
diff --git a/CCharLearn/Pages/Learn.razor b/CCharLearn/Pages/Learn.razor
index ef881b5..dd00ad2 100644
--- a/CCharLearn/Pages/Learn.razor
+++ b/CCharLearn/Pages/Learn.razor
@@ -26,12 +26,16 @@
 
 <MudContainer Class="justify-center d-flex ma-0" Style="height: 100%;">
     <MudStack Class="d-flex">
-        @*<MudStack Row=true Class="pt-2 d-flex justify-center">
-            @if (!Answers.Any(x => x == null))
-            {
-                <MudButton Disabled="@(!(Answers.Any(x=>x.isSelected)))" OnClick="()=>RemoveCCharFromSelection()" Variant="Variant.Outlined">Avoid</MudButton>
-            }
-        </MudStack>*@
+        @*True if debug, false for not debug. (TODO: Use an extensíonMethod: https://stackoverflow.com/questions/4696175/preprocessor-directives-in-razor)*@
+        @if (true)
+        {
+            <MudStack Row=true Class="pt-2 d-flex justify-center">
+                @if (!Answers.Any(x => x == null))
+                {
+                    <MudButton Disabled="@(!(Answers.Any(x=>x.isSelected)))" OnClick="()=>RemoveCCharFromSelection()" Variant="Variant.Outlined">Avoid</MudButton>
+                }
+            </MudStack>
+        }
         <MudContainer Class="pt-12">
             <MudPaper Class="pa-16 ma-2 rounded-xl mud-dark" Elevation="1">
                 <MudContainer Style="width: 100px; height: 100px" Class="pa-8 ma-4 d-flex justify-center align-center">
@@ -118,6 +122,28 @@
     {
         Program.UpdateUiEvent += OnUiUpdate;
 
+        bool continueLast = 
+               await localStorage.ContainKeyAsync("ContinueLearning")
+            && await localStorage.ContainKeyAsync("ContinueData")
+            && await localStorage.GetItemAsync<bool>("ContinueLearning");
+
+        if (continueLast)
+        {
+            await LoadCharectersFromContinue();
+        }
+        else
+        {
+            await LoadCharectersFromChunk();            
+        }
+
+        Program.CCharsLeft = DontSkipTheseCChar.Count;
+        Program.InvokeUiUpdate();
+
+        GenerateQuestion();
+    }
+
+    async Task LoadCharectersFromChunk()
+    {
         isSavedLocally = await localStorage.ContainKeyAsync("Normalized_chunk_001.json");
 
         int selectedChunk = await localStorage.GetItemAsync<int>("SelectedChunk");
@@ -130,11 +156,15 @@
             Charecters = JsonConvert.DeserializeObject<CChar[]>(json);
         }
 
-        DontSkipTheseCChar = Charecters.Select(x=>new CCharStats(x)).ToList();
-        Program.CCharsLeft = DontSkipTheseCChar.Count;
-        Program.InvokeUiUpdate();
+        DontSkipTheseCChar = Charecters.Select(x => new CCharStats(x)).ToList();
+    }
 
-        GenerateQuestion();
+    async Task LoadCharectersFromContinue()
+    {
+        string continueDataJson = await localStorage.GetItemAsStringAsync("ContinueData");
+        CCharStats[] charectersLeft = JsonConvert.DeserializeObject<CCharStats[]>(continueDataJson);
+
+        DontSkipTheseCChar = charectersLeft.ToList();
     }
 
     void OnUiUpdate() => StateHasChanged();
@@ -170,9 +200,11 @@
 
             Answers[i].isCorrect = true;
         }
+
+        StateHasChanged();
     }
 
-    void FinishAndKickBackToLearn()
+    async void FinishAndKickBackToLearn()
     {
         Snackbar.Add("Congrats, you have compleated this chunk!", Severity.Success, config => 
         { 
@@ -182,6 +214,8 @@
         Program.UpdateUiEvent -= OnUiUpdate;
         Program.CCharsLeft = 0;
 
+        await localStorage.RemoveItemAsync("ContinueData");
+
         navigator.NavigateTo("");
     }
 
@@ -221,9 +255,20 @@
             }
         }
 
+        await SaveContinueData();
+
         GenerateQuestion();
     }
 
+    async Task SaveContinueData()
+    {
+        CCharStats[] charectersLeft = DontSkipTheseCChar.ToArray();
+        string continueDataJson = JsonConvert.SerializeObject(charectersLeft);
+
+        await localStorage.SetItemAsStringAsync("ContinueData", continueDataJson);
+        await localStorage.SetItemAsync("ContinueCharectersLeft", charectersLeft.Length);
+    }
+
     public class Answer
     {
         public Answer()
@@ -260,6 +305,7 @@
         CCharStats correctCCharStats = DontSkipTheseCChar.First(x => x.cchar == correctChar);
         return correctCCharStats;
     }
+
     public void increaseCCharStat(CCharStats stats, StatType statType)
     {
         int correctStatsIndex = DontSkipTheseCChar.IndexOf(stats);
@@ -275,7 +321,7 @@
         }
     }
 
-    public void RemoveCCharFromSelection(bool ignoreSelection = false)
+    public async void RemoveCCharFromSelection(bool ignoreSelection = false)
     {
         CCharStats correctCCharStats = GetCorrectCCharStats();
 
@@ -294,6 +340,9 @@
         Console.WriteLine("Remaining CChars: " + DontSkipTheseCChar);
         Program.CCharsLeft = DontSkipTheseCChar.Count;
         Program.InvokeUiUpdate();
+
+        await SaveContinueData();
+
         GenerateQuestion();
     }
 
diff --git a/CCharLearn/wwwroot/index.html b/CCharLearn/wwwroot/index.html
index 9457910..6f53f7f 100644
--- a/CCharLearn/wwwroot/index.html
+++ b/CCharLearn/wwwroot/index.html
@@ -24,7 +24,7 @@
     </div>
     <script src="_framework/blazor.webassembly.js"></script>
     <script src="_content/MudBlazor/MudBlazor.min.js"></script>
-    <!--<script>navigator.serviceWorker.register('service-worker.js');</script>-->
+    <script>navigator.serviceWorker.register('service-worker.js');</script>
 </body>
 
 </html>