@page "/models"
@attribute [Authorize]
@inject IOllamaService OllamaService
@inject NavigationManager Navigation
@inject ILocalizationService Loc


<PageTitle>@Loc["page.title.models"]</PageTitle>

@if (_isCloudBackend)
{
    <div style="padding: 24px; text-align: center; color: var(--text-muted);">
        <p>@Loc["models.cloud.not_available"]</p>
        <p style="font-size: 12px; margin-top: 8px;">@Loc["models.cloud.hint"]</p>
    </div>
}
else
{
    <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px;">
        <h3>@Loc["models.heading"]</h3>
        <button @onclick="RefreshModels" disabled="@isLoading">@Loc["models.button.refresh"]</button>
    </div>

    @if (isLoading)
    {
        <p>@Loc["models.status.loading"]</p>
    }
    else if (!string.IsNullOrEmpty(errorMessage))
    {
        <div style="color: red; margin-bottom: 12px;">@errorMessage</div>
    }
    else
    {
        <div class="model-list">
            @foreach (var model in localModels)
            {
                <div class="model-card">
                    <div style="display:flex;justify-content:space-between;align-items:flex-start;">
                        <div>
                            <div class="model-name">@model.Name</div>
                            <div class="model-details">
                                @Loc["models.label.size"] @FormatSize(model.Size) |
                                @Loc["models.label.modified"] @model.ModifiedAt?.ToString("g")
                            </div>
                        </div>
                        <button class="btn-sm" @onclick="() => DeleteModel(model.Name)" style="color:#c0392b;flex-shrink:0;">
                            Löschen
                        </button>
                    </div>
                </div>
            }
        </div>
    }

    <div style="margin-top: 24px; border-top: 1px solid var(--border-color); padding-top: 16px;">
        <h4 style="margin-bottom: 8px;">@Loc["models.pull.heading"]</h4>
        <div style="display: flex; gap: 8px; align-items: flex-end;">
            <div class="form-group" style="flex: 1; margin-bottom: 0;">
                <label for="pullModelName">@Loc["models.pull.label.name"]</label>
                <input id="pullModelName" @bind="modelToPull" @bind:event="oninput" placeholder="@Loc["models.pull.placeholder"]" />
            </div>
            <button @onclick="PullModel" disabled="@_pullDisabled">
                @Loc["models.pull.button.download"]
            </button>
        </div>
        @if (isPulling)
        {
            <div style="margin-top: 8px;">
                <div class="progress-bar">
                    <div class="progress-fill" style="width: @pullPercentDisplay"></div>
                </div>
                <div style="font-size: 12px; margin-top: 4px;">@pullStatus (@pullPercentDisplay)</div>
            </div>
        }
    </div>

    @if (pullResult != null)
    {
        <div style="margin-top: 12px; padding: 8px; background: var(--card-bg); border: 1px solid var(--accent-color); font-size: 13px;">
            @pullResult
        </div>
    }

    @if (_confirmDeleteModel != null)
    {
        <div class="modal-overlay">
            <div class="modal-dialog modal-sm">
                <div class="modal-title">Modell löschen</div>
                <div class="modal-body">
                    <p>Soll das Modell <strong>@_confirmDeleteModel</strong> wirklich gelöscht werden?</p>
                </div>
                <div class="modal-actions">
                    <button @onclick="CancelDelete">Abbrechen</button>
                    <button @onclick="ConfirmDelete" class="btn-danger">Löschen</button>
                </div>
            </div>
        </div>
    }
}

@code {
    private List<LLM_Model> localModels = new();
    private bool isLoading;
    private string? errorMessage;
    private string modelToPull = string.Empty;
    private bool isPulling;
    private bool _pullDisabled => isPulling || string.IsNullOrWhiteSpace(modelToPull);
    private double pullProgress;
    private string pullStatus = string.Empty;
    private string? pullResult;
    private string pullPercentDisplay => $"{pullProgress:F0}%";
    private string? _confirmDeleteModel;
    private bool _isCloudBackend;

    protected override async Task OnInitializedAsync()
    {
        _isCloudBackend = !OllamaService.SupportsModelManagement;
        if (!_isCloudBackend)
            await RefreshModels();
    }

    private async Task RefreshModels()
    {
        isLoading = true;
        errorMessage = null;

        try
        {
            var models = await OllamaService.GetLocalModelsAsync();
            localModels = models.ToList();
        }
        catch (Exception ex)
        {
            errorMessage = $"{Loc["models.error.loading"]} {ex.Message}";
            localModels = new();
        }
        finally
        {
            isLoading = false;
        }
    }

    private async Task PullModel()
    {
        if (string.IsNullOrWhiteSpace(modelToPull)) return;

        isPulling = true;
        pullProgress = 0;
        pullStatus = Loc["models.pull.status.starting"];
        pullResult = null;

        try
        {
            var progress = new Progress<string>(status =>
            {
                pullStatus = status;
                var m = System.Text.RegularExpressions.Regex.Match(status, @"\((\d+)%\)");
                if (m.Success && double.TryParse(m.Groups[1].Value, out var pct))
                    pullProgress = pct;
                InvokeAsync(StateHasChanged);
            });

            await OllamaService.PullModelAsync(modelToPull, progress);
            pullResult = $"{Loc["models.pull.status.model"]} '{modelToPull}' {Loc["models.pull.status.success"]}";
            modelToPull = string.Empty;
            await RefreshModels();
        }
        catch (Exception ex)
        {
            pullResult = $"{Loc["common.error"]} {ex.Message}";
        }
        finally
        {
            isPulling = false;
        }
    }

    private void DeleteModel(string name)
    {
        _confirmDeleteModel = name;
    }

    private void CancelDelete()
    {
        _confirmDeleteModel = null;
    }

    private async Task ConfirmDelete()
    {
        if (_confirmDeleteModel == null) return;

        try
        {
            var deleted = await OllamaService.DeleteModelAsync(_confirmDeleteModel);
            if (deleted)
                await RefreshModels();
            else
                errorMessage = $"Fehler beim Löschen von '{_confirmDeleteModel}'";
        }
        catch (Exception ex)
        {
            errorMessage = $"Fehler: {ex.Message}";
        }
        finally
        {
            _confirmDeleteModel = null;
        }
    }

    private static string FormatSize(long? bytes)
    {
        if (!bytes.HasValue) return "---";
        if (bytes < 1024 * 1024) return $"{bytes / 1024.0:F1} KB";
        if (bytes < 1024 * 1024 * 1024) return $"{bytes / (1024.0 * 1024):F1} MB";
        return $"{bytes / (1024.0 * 1024 * 1024):F1} GB";
    }
}