@page "/"
@page "/system/health"
@using System.Reflection
@using ErsatzTV.Application.Health
@using ErsatzTV.Core.Health
@using ErsatzTV.Core.Interfaces.GitHub
@using Microsoft.Extensions.Caching.Memory
@implements IDisposable
@inject IGitHubApiClient GitHubApiClient
@inject IMemoryCache MemoryCache
@inject IMediator Mediator
@inject SystemStartup SystemStartup;

<MudForm Style="max-height: 100%">
    <div class="d-flex flex-column" style="height: 100vh; overflow-x: auto">
        <MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
            @if (!SystemStartup.IsDatabaseReady)
            {
                <MudCard>
                    <MudCardHeader>
                        <CardHeaderContent>
                            <MudText Typo="Typo.h4">Database is initializing</MudText>
                        </CardHeaderContent>
                    </MudCardHeader>
                    <MudCardContent>
                        <MudText>Please wait, this may take a few minutes.</MudText>
                        <MudText>This page will automatically refresh when the database is ready.</MudText>
                    </MudCardContent>
                    <MudCardActions>
                        <MudProgressCircular Color="Color.Primary" Size="Size.Medium" Indeterminate="true"/>
                    </MudCardActions>
                </MudCard>
            }
            else if (!SystemStartup.IsSearchIndexReady)
            {
                <MudCard>
                    <MudCardHeader>
                        <CardHeaderContent>
                            <MudText Typo="Typo.h4">Search Index is initializing</MudText>
                        </CardHeaderContent>
                    </MudCardHeader>
                    <MudCardContent>
                        <MudText>Please wait, this may take a few minutes.</MudText>
                        <MudText>This page will automatically refresh when the search index is ready.</MudText>
                    </MudCardContent>
                    <MudCardActions>
                        <MudProgressCircular Color="Color.Primary" Size="Size.Medium" Indeterminate="true"/>
                    </MudCardActions>
                </MudCard>
            }
            else
            {
                <MudText Typo="Typo.h5" Class="mb-2">Health Checks</MudText>
                <MudDivider Class="mb-6"/>
                <MudTable Hover="true"
                          Dense="true"
                          Breakpoint="Breakpoint.None"
                          ServerData="@(new Func<TableState, CancellationToken, Task<TableData<HealthCheckResult>>>(ServerReload))">
                    <HeaderContent>
                        <MudTh>Check</MudTh>
                        <MudTh>Message</MudTh>
                    </HeaderContent>
                    <RowTemplate>
                        <MudTd>
                            <div style="align-items: center; display: flex; flex-direction: row;">
                                @if (context.Status == HealthCheckStatus.Fail)
                                {
                                    <MudIcon Color="@Color.Error" Icon="@Icons.Material.Filled.Error"/>
                                }
                                else if (context.Status == HealthCheckStatus.Warning)
                                {
                                    <MudIcon Color="@Color.Warning" Icon="@Icons.Material.Filled.Warning"/>
                                }
                                else if (context.Status == HealthCheckStatus.Info)
                                {
                                    <MudIcon Color="@Color.Info" Icon="@Icons.Material.Filled.Info"/>
                                }
                                else
                                {
                                    <MudIcon Color="@Color.Success" Icon="@Icons.Material.Filled.Check"/>
                                }
                                <div class="ml-2">@context.Title</div>
                            </div>
                        </MudTd>
                        <MudTd>
                            <MudHidden Breakpoint="Breakpoint.Xs">
                                @if (context.Link.IsSome)
                                {
                                    foreach (HealthCheckLink link in context.Link)
                                    {
                                        if (link.Link.StartsWith("http"))
                                        {
                                            <MudLink Href="@link.Link" Target="_blank">
                                                @context.Message
                                            </MudLink>
                                        }
                                        else
                                        {
                                            <MudLink Href="@link.Link">
                                                @context.Message
                                            </MudLink>
                                        }
                                    }
                                }
                                else
                                {
                                    <MudText>
                                        @context.Message
                                    </MudText>
                                }
                            </MudHidden>
                            <MudHidden Breakpoint="Breakpoint.Xs" Invert="true">
                                @if (context.Link.IsSome)
                                {
                                    foreach (HealthCheckLink link in context.Link)
                                    {
                                        <MudLink Href="@link.Link">
                                            @context.BriefMessage
                                        </MudLink>
                                    }
                                }
                                else
                                {
                                    <MudText>
                                        @context.BriefMessage
                                    </MudText>
                                }
                            </MudHidden>
                        </MudTd>
                    </RowTemplate>
                </MudTable>
                <MudCard Class="mt-6">
                    <MudCardHeader>
                        <MudText Class="mt-6">Full changelog is available on <MudLink Href="https://github.com/ErsatzTV/ErsatzTV/blob/main/CHANGELOG.md" Target="_blank">GitHub</MudLink></MudText>
                    </MudCardHeader>
                    <MudCardContent Class="release-notes mud-typography mud-typography-body1">
                        <MarkdownView Content="@_releaseNotes"/>
                    </MudCardContent>
                </MudCard>
            }
        </MudContainer>
    </div>
</MudForm>

@code {
    private CancellationTokenSource _cts;

    private string _releaseNotes;

    protected override void OnInitialized()
    {
        SystemStartup.OnDatabaseReady += OnStartupProgress;
        SystemStartup.OnSearchIndexReady += OnStartupProgress;
    }

    public void Dispose()
    {
        SystemStartup.OnDatabaseReady -= OnStartupProgress;
        SystemStartup.OnSearchIndexReady -= OnStartupProgress;

        _cts?.Cancel();
        _cts?.Dispose();
    }

    private async void OnStartupProgress(object sender, EventArgs e)
    {
        try
        {
            await InvokeAsync(StateHasChanged);
        }
        catch (Exception)
        {
            // do nothing
        }
    }

    protected override async Task OnParametersSetAsync()
    {
        _cts?.Cancel();
        _cts?.Dispose();
        _cts = new CancellationTokenSource();
        var token = _cts.Token;

        try
        {
            if (MemoryCache.TryGetValue("Index.ReleaseNotesHtml", out string releaseNotesHtml))
            {
                _releaseNotes = releaseNotesHtml;
            }
            else
            {
                var assembly = Assembly.GetEntryAssembly();
                if (assembly != null)
                {
                    string version = assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>()?.InformationalVersion;
                    if (version != null)
                    {
                        Either<BaseError, string> maybeNotes;

                        if (version != "develop")
                        {
                            string gitHubVersion = version.Split("-").Head();
                            if (!gitHubVersion.StartsWith("v"))
                            {
                                gitHubVersion = $"v{gitHubVersion}";
                            }

                            maybeNotes = await GitHubApiClient.GetReleaseNotes(gitHubVersion, token);
                            foreach (string notes in maybeNotes.RightToSeq())
                            {
                                _releaseNotes = notes;
                            }
                        }
                        else
                        {
                            maybeNotes = await GitHubApiClient.GetLatestReleaseNotes(token);
                            foreach (string notes in maybeNotes.RightToSeq())
                            {
                                _releaseNotes = notes;
                            }
                        }
                    }
                }

                if (_releaseNotes != null)
                {
                    MemoryCache.Set("Index.ReleaseNotesHtml", _releaseNotes);
                }
            }
        }
        catch (Exception)
        {
            // ignore
        }
    }

    private async Task<TableData<HealthCheckResult>> ServerReload(TableState state, CancellationToken cancellationToken)
    {
        List<HealthCheckResult> healthCheckResults = await Mediator.Send(new GetAllHealthCheckResults(), cancellationToken);

        return new TableData<HealthCheckResult>
        {
            TotalItems = healthCheckResults.Count,
            Items = healthCheckResults
        };
    }

}