@page "/settings"
@using Marathon.Application.Storage
@using LocalizationOptions = Marathon.UI.Services.LocalizationOptions
@inject IStringLocalizer<SharedResource> L
@inject IOptionsMonitor<ScrapingSettingsForm> ScrapingOpts
@inject IOptionsMonitor<WorkerOptions> WorkerOpts
@inject IOptionsMonitor<StorageOptions> StorageOpts
@inject IOptionsMonitor<AnomalyOptions> AnomalyOpts
@inject IOptionsMonitor<Marathon.UI.Services.LocalizationOptions> LocaleOpts
@inject ISettingsWriter Writer
@inject IDialogService Dialogs
@inject ISnackbar Snackbar
@inject ILogger<Settings> Logger

<PageTitle>@L["App.Title"] · @L["Settings.Title"]</PageTitle>

<section class="m-shell">
    <header class="m-rise m-rise-1" style="display: grid; gap: var(--m-space-3); max-width: 880px;">
        <span class="m-kicker">@L["Settings.Kicker"]</span>
        <h1 class="m-display" style="font-size: clamp(2rem, 4vw, 3rem);">@L["Settings.Title"]</h1>
        <p style="color: var(--m-c-ink-soft); max-width: 70ch;">@L["Settings.Lede"]</p>
    </header>

    <hr class="m-rule--double" />

    @* SCRAPING *@
    <article class="m-section m-rise m-rise-2">
        <header class="m-section__head">
            <h2>@L["Settings.Section.Scraping"]</h2>
            <MudButton Variant="Variant.Text"
                       Size="Size.Small"
                       OnClick="@(() => ResetSectionAsync(ScrapingSettingsForm.SectionName))">
                @L["Settings.Action.Reset"]
            </MudButton>
        </header>
        <div class="m-section__body">
            <Field Label="@L["Settings.Scraping.PollingIntervalSeconds"]" Hint="@L["Settings.Scraping.PollingIntervalSeconds.Hint"]">
                <MudNumericField T="int" @bind-Value="_scraping.PollingIntervalSeconds" Min="5" Max="3600" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Scraping.MaxConcurrentRequests"]" Hint="@L["Settings.Scraping.MaxConcurrentRequests.Hint"]">
                <MudNumericField T="int" @bind-Value="_scraping.MaxConcurrentRequests" Min="1" Max="16" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Scraping.RateLimitRps"]" Hint="@L["Settings.Scraping.RateLimitRps.Hint"]">
                <MudNumericField T="int" @bind-Value="_scraping.RateLimit.RequestsPerSecond" Min="1" Max="20" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Scraping.RetryMaxAttempts"]">
                <MudNumericField T="int" @bind-Value="_scraping.RetryPolicy.MaxAttempts" Min="0" Max="10" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Scraping.RetryBaseDelayMs"]">
                <MudNumericField T="int" @bind-Value="_scraping.RetryPolicy.BaseDelayMs" Min="100" Max="60000" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Scraping.BaseUrl"]" Hint="@L["Settings.Scraping.BaseUrl.Hint"]">
                <MudTextField T="string" @bind-Value="_scraping.BaseUrl" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Scraping.RequestTimeoutSeconds"]">
                <MudNumericField T="int" @bind-Value="_scraping.RequestTimeoutSeconds" Min="5" Max="600" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Scraping.UserAgents"]" Hint="@L["Settings.Scraping.UserAgents.Hint"]">
                <MudTextField T="string"
                              Value="@_userAgentsRaw"
                              ValueChanged="@OnUserAgentsChanged"
                              Lines="4"
                              Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Scraping.UsePlaywright"]">
                <MudSwitch T="bool" @bind-Value="_scraping.UsePlaywright" Color="Color.Primary" />
            </Field>

            <SectionFooter OnSave="@(() => SaveSectionAsync(ScrapingSettingsForm.SectionName, _scraping))" />
        </div>
    </article>

    @* WORKERS *@
    <article class="m-section m-rise m-rise-3">
        <header class="m-section__head">
            <h2>@L["Settings.Section.Workers"]</h2>
            <MudButton Variant="Variant.Text" Size="Size.Small"
                       OnClick="@(() => ResetSectionAsync(WorkerOptions.SectionName))">
                @L["Settings.Action.Reset"]
            </MudButton>
        </header>
        <div class="m-section__body">
            <Field Label="@L["Settings.Workers.UpcomingScheduleCron"]" Hint="@L["Settings.Workers.UpcomingScheduleCron.Hint"]">
                <MudTextField T="string" @bind-Value="_workers.UpcomingScheduleCron" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Workers.UpcomingPollerEnabled"]">
                <MudSwitch T="bool" @bind-Value="_workers.UpcomingPollerEnabled" Color="Color.Primary" />
            </Field>
            <Field Label="@L["Settings.Workers.LivePollerEnabled"]">
                <MudSwitch T="bool" @bind-Value="_workers.LivePollerEnabled" Color="Color.Primary" />
            </Field>
            <Field Label="@L["Settings.Workers.LivePollIntervalSeconds"]" Hint="@L["Settings.Workers.LivePollIntervalSeconds.Hint"]">
                <MudNumericField T="int" @bind-Value="_workers.LivePollIntervalSeconds" Min="5" Max="3600" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Workers.ResultsPollerEnabled"]" Hint="@L["Settings.Workers.ResultsPollerEnabled.Hint"]">
                <MudSwitch T="bool" @bind-Value="_workers.ResultsPollerEnabled" Color="Color.Primary" />
            </Field>
            <Field Label="@L["Settings.Workers.ResultsPollIntervalSeconds"]">
                <MudNumericField T="int" @bind-Value="_workers.ResultsPollIntervalSeconds" Min="60" Max="7200" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Workers.AnomalyDetectionEnabled"]" Hint="@L["Settings.Workers.AnomalyDetectionEnabled.Hint"]">
                <MudSwitch T="bool" @bind-Value="_workers.AnomalyDetectionEnabled" Color="Color.Primary" />
            </Field>

            <SectionFooter OnSave="@(() => SaveSectionAsync(WorkerOptions.SectionName, _workers))" />
        </div>
    </article>

    @* STORAGE *@
    <article class="m-section m-rise m-rise-4">
        <header class="m-section__head">
            <h2>@L["Settings.Section.Storage"]</h2>
            <MudButton Variant="Variant.Text" Size="Size.Small"
                       OnClick="@(() => ResetSectionAsync(StorageOptions.SectionName))">
                @L["Settings.Action.Reset"]
            </MudButton>
        </header>
        <div class="m-section__body">
            <Field Label="@L["Settings.Storage.DatabasePath"]">
                <MudTextField T="string" @bind-Value="_storage.DatabasePath" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Storage.ExportDirectory"]">
                <MudTextField T="string" @bind-Value="_storage.ExportDirectory" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Storage.SnapshotRetentionDays"]">
                <MudNumericField T="int" @bind-Value="_storage.SnapshotRetentionDays" Min="1" Max="3650" Variant="Variant.Outlined" />
            </Field>

            <SectionFooter OnSave="@(() => SaveSectionAsync(StorageOptions.SectionName, _storage))" />
        </div>
    </article>

    @* ANOMALY *@
    <article class="m-section m-rise m-rise-5">
        <header class="m-section__head">
            <h2>@L["Settings.Section.Anomaly"]</h2>
            <MudButton Variant="Variant.Text" Size="Size.Small"
                       OnClick="@(() => ResetSectionAsync(AnomalyOptions.SectionName))">
                @L["Settings.Action.Reset"]
            </MudButton>
        </header>
        <div class="m-section__body">
            <Field Label="@L["Settings.Anomaly.SuspensionGapSeconds"]">
                <MudNumericField T="int" @bind-Value="_anomaly.SuspensionGapSeconds" Min="5" Max="3600" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Anomaly.OddsFlipThreshold"]">
                <MudNumericField T="decimal" @bind-Value="_anomaly.OddsFlipThreshold" Min="0.01m" Max="1m" Step="0.01m" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Anomaly.MinSnapshotCount"]">
                <MudNumericField T="int" @bind-Value="_anomaly.MinSnapshotCount" Min="2" Max="100" Variant="Variant.Outlined" />
            </Field>
            <Field Label="@L["Settings.Anomaly.DetectionIntervalSeconds"]">
                <MudNumericField T="int" @bind-Value="_anomaly.DetectionIntervalSeconds" Min="5" Max="3600" Variant="Variant.Outlined" />
            </Field>

            <SectionFooter OnSave="@(() => SaveSectionAsync(AnomalyOptions.SectionName, _anomaly))" />
        </div>
    </article>

    @* LOCALIZATION *@
    <article class="m-section m-rise m-rise-5">
        <header class="m-section__head">
            <h2>@L["Settings.Section.Localization"]</h2>
            <MudButton Variant="Variant.Text" Size="Size.Small"
                       OnClick="@(() => ResetSectionAsync(LocalizationOptions.SectionName))">
                @L["Settings.Action.Reset"]
            </MudButton>
        </header>
        <div class="m-section__body">
            <Field Label="@L["Settings.Localization.DefaultCulture"]">
                <MudSelect T="string" @bind-Value="_locale.DefaultCulture" Variant="Variant.Outlined">
                    <MudSelectItem T="string" Value="@LocaleState.Russian">@L["Locale.Russian"] · ru-RU</MudSelectItem>
                    <MudSelectItem T="string" Value="@LocaleState.English">@L["Locale.English"] · en-US</MudSelectItem>
                </MudSelect>
            </Field>

            <SectionFooter OnSave="@(() => SaveSectionAsync(LocalizationOptions.SectionName, _locale))" />
        </div>
    </article>
</section>

@code {
    private ScrapingSettingsForm _scraping = new();
    private WorkerOptions _workers = new();
    private StorageOptions _storage = new();
    private AnomalyOptions _anomaly = new();
    private LocalizationOptions _locale = new();
    private string _userAgentsRaw = string.Empty;

    protected override void OnInitialized()
    {
        _scraping = ScrapingOpts.CurrentValue.Clone();
        _userAgentsRaw = string.Join('\n', _scraping.UserAgents ?? Array.Empty<string>());

        _workers = new WorkerOptions
        {
            UpcomingScheduleCron    = WorkerOpts.CurrentValue.UpcomingScheduleCron,
            LivePollerEnabled       = WorkerOpts.CurrentValue.LivePollerEnabled,
            UpcomingPollerEnabled   = WorkerOpts.CurrentValue.UpcomingPollerEnabled,
            LivePollIntervalSeconds = WorkerOpts.CurrentValue.LivePollIntervalSeconds,
            ResultsPollerEnabled    = WorkerOpts.CurrentValue.ResultsPollerEnabled,
            ResultsPollIntervalSeconds = WorkerOpts.CurrentValue.ResultsPollIntervalSeconds,
            AnomalyDetectionEnabled = WorkerOpts.CurrentValue.AnomalyDetectionEnabled,
        };

        _storage = new StorageOptions
        {
            DatabasePath = StorageOpts.CurrentValue.DatabasePath,
            ExportDirectory = StorageOpts.CurrentValue.ExportDirectory,
            SnapshotRetentionDays = StorageOpts.CurrentValue.SnapshotRetentionDays,
        };

        _anomaly = new AnomalyOptions
        {
            SuspensionGapSeconds = AnomalyOpts.CurrentValue.SuspensionGapSeconds,
            OddsFlipThreshold = AnomalyOpts.CurrentValue.OddsFlipThreshold,
            MinSnapshotCount = AnomalyOpts.CurrentValue.MinSnapshotCount,
            DetectionIntervalSeconds = AnomalyOpts.CurrentValue.DetectionIntervalSeconds,
        };

        _locale = new LocalizationOptions { DefaultCulture = LocaleOpts.CurrentValue.DefaultCulture };
    }

    private void OnUserAgentsChanged(string raw)
    {
        _userAgentsRaw = raw;
        _scraping.UserAgents = (raw ?? string.Empty)
            .Split('\n', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
    }

    private async Task SaveSectionAsync<T>(string section, T payload) where T : class
    {
        // Section-level validation — fails fast before disk write so the
        // user sees the snackbar immediately and the JSON file isn't touched.
        if (payload is StorageOptions storage)
        {
            var errorKey = StoragePathValidator.Validate(storage);
            if (errorKey is not null)
            {
                Snackbar.Add(L[errorKey], Severity.Error);
                return;
            }
        }

        if (payload is ScrapingSettingsForm scraping
            && !(Uri.TryCreate(scraping.BaseUrl, UriKind.Absolute, out var baseUri)
                 && (baseUri.Scheme == Uri.UriSchemeHttp || baseUri.Scheme == Uri.UriSchemeHttps)))
        {
            Snackbar.Add(L["Settings.Scraping.BaseUrl.Invalid"], Severity.Error);
            return;
        }

        if (payload is WorkerOptions workers && !IsPlausibleCron(workers.UpcomingScheduleCron))
        {
            Snackbar.Add(L["Settings.Workers.Cron.Invalid"], Severity.Error);
            return;
        }

        var confirmed = await ConfirmAsync();
        if (!confirmed)
        {
            return;
        }

        try
        {
            await Writer.SaveSectionAsync(section, payload);
            Snackbar.Add(L["Settings.Saved"], Severity.Success);
        }
        catch (Exception ex)
        {
            Logger.LogError(ex, "Failed to save section {Section}", section);
            Snackbar.Add(L["Settings.SaveFailed"], Severity.Error);
        }
    }

    // Lightweight 5- or 6-field cron sanity check — avoids a Cronos dependency in the
    // UI layer; the worker still does the authoritative parse at startup.
    private static bool IsPlausibleCron(string? expression)
    {
        if (string.IsNullOrWhiteSpace(expression)) return false;
        var fields = expression.Split(' ', StringSplitOptions.RemoveEmptyEntries);
        return fields.Length is 5 or 6;
    }

    private async Task ResetSectionAsync(string section)
    {
        var confirmed = await ConfirmAsync();
        if (!confirmed)
        {
            return;
        }

        try
        {
            await Writer.ResetSectionAsync(section);
            Snackbar.Add(L["Settings.Saved"], Severity.Success);
        }
        catch (Exception ex)
        {
            Logger.LogError(ex, "Failed to reset section {Section}", section);
            Snackbar.Add(L["Settings.SaveFailed"], Severity.Error);
        }
    }

    private async Task<bool> ConfirmAsync()
    {
        var result = await Dialogs.ShowMessageBox(
            title: L["Settings.Confirm.Title"],
            message: L["Settings.Confirm.Body"],
            yesText: L["Settings.Action.Save"],
            cancelText: L["Common.Cancel"]);

        return result == true;
    }
}