@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;

<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
    {
        <MudTable Hover="true"
                  Dense="true"
                  ServerData="@(new Func<TableState, CancellationToken, Task<TableData<HealthCheckResult>>>(ServerReload))"
                  @ref="_table">
            <ToolBarContent>
                <MudText Typo="Typo.h6">Health Checks</MudText>
            </ToolBarContent>
            <HeaderContent>
                <MudTh>Check</MudTh>
                <MudTh>Message</MudTh>
            </HeaderContent>
            <RowTemplate>
                <MudTd DataLabel="Check">
                    <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 DataLabel="Message">
                    @if (context.Link.IsSome)
                    {
                        foreach (string link in context.Link)
                        {
                            <MudLink Href="@link">
                                @context.Message
                            </MudLink>
                        }
                    }
                    else
                    {
                        <MudText>
                            @context.Message
                        </MudText>
                    }
                </MudTd>
            </RowTemplate>
        </MudTable>
        <MudCard Class="mt-6" Style="max-height: 600px; overflow: auto">
            <MudCardContent Class="release-notes mud-typography mud-typography-body1">
                <MarkdownView Content="@_releaseNotes"/>
            </MudCardContent>
        </MudCard>
        <MudText Class="mt-6">Full changelog is available on <MudLink Href="https://github.com/ErsatzTV/ErsatzTV/blob/main/CHANGELOG.md">GitHub</MudLink></MudText>
    }
</MudContainer>

@code {
    private readonly CancellationTokenSource _cts = new();

    private string _releaseNotes;
    private MudTable<HealthCheckResult> _table;

    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()
    {
        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, _cts.Token);
                            foreach (string notes in maybeNotes.RightToSeq())
                            {
                                _releaseNotes = notes;
                            }
                        }
                        else
                        {
                            maybeNotes = await GitHubApiClient.GetLatestReleaseNotes(_cts.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(), _cts.Token);

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

}