@namespace TelegramPanel.Web.Components.Dialogs
@inject BatchTaskManagementService TaskManagement
@inject TelegramPanel.Web.Modules.ModuleContributionRegistry Contributions
@inject ISnackbar Snackbar
@inject IDialogService DialogService
@inject NavigationManager Navigation
@using System.Text.Json
@using Microsoft.AspNetCore.Components
@using TelegramPanel.Data.Entities

<MudDialog>
    <DialogContent>
        <MudStack Spacing="2">
            <MudAlert Severity="Severity.Info" Variant="Variant.Outlined" Dense="true">
                任务会提交到后台执行，可在【任务中心】查看进度与结果。
            </MudAlert>

            <MudGrid>
                <MudItem xs="12" md="6">
                <MudSelect @bind-Value="selectedCategory" Label="任务分类" Variant="Variant.Outlined" Dense="true">
                    @foreach (var c in AvailableCategories)
                    {
                        <MudSelectItem Value="@c">@GetCategoryDisplayName(c)</MudSelectItem>
                    }
                </MudSelect>
                </MudItem>
                <MudItem xs="12" md="6">
                    <MudSelect @bind-Value="selectedTaskType" Label="任务类型" Variant="Variant.Outlined" Dense="true">
                        @foreach (var opt in AvailableOptions)
                        {
                            <MudSelectItem Value="@opt.TaskType">@opt.DisplayName</MudSelectItem>
                        }
                    </MudSelect>
                </MudItem>
            </MudGrid>

            @if (CurrentOption != null && !string.IsNullOrWhiteSpace(CurrentOption.Description))
            {
                <MudText Typo="Typo.caption" Class="mud-text-secondary">@CurrentOption.Description</MudText>
            }

            @if (CurrentOption != null && !string.IsNullOrWhiteSpace(CurrentOption.CreateRoute))
            {
                <MudAlert Severity="Severity.Info" Variant="Variant.Outlined" Dense="true">
                    该任务建议使用配置窗口创建/编辑：<b>@CurrentOption.CreateRoute</b>
                </MudAlert>
                <MudStack Row="true" Spacing="2">
                    <MudButton Variant="Variant.Filled" Color="Color.Primary" OnClick="@(() => OpenCreateDialog(CurrentOption.CreateRoute!))">
                        打开窗口
                    </MudButton>
                    <MudButton Variant="Variant.Outlined" Color="Color.Default" OnClick="@(() => NavigateTo(CurrentOption.CreateRoute!))">
                        前往页面
                    </MudButton>
                </MudStack>
            }
            else if (CurrentOption != null && !string.IsNullOrWhiteSpace(CurrentOption.EditorComponentType) && editorComponentType != null)
            {
                <MudAlert Severity="Severity.Info" Variant="Variant.Outlined" Dense="true">
                    该任务由模块提供自定义创建器。
                </MudAlert>

                <DynamicComponent Type="editorComponentType" Parameters="editorParameters" />

                @if (!string.IsNullOrWhiteSpace(editorDraft.ValidationError))
                {
                    <MudText Typo="Typo.caption" Color="Color.Error">@editorDraft.ValidationError</MudText>
                }
            }
            else
            {
                <MudAlert Severity="Severity.Info" Variant="Variant.Outlined" Dense="true">
                    该任务类型暂无专用创建表单。你可以填写通用配置（JSON 字符串）提交任务；对应模块需要在后台实现该 TaskType 的执行器。
                </MudAlert>

                <MudTextField @bind-Value="genericConfigJson" Label="任务配置（JSON）" Variant="Variant.Outlined" Lines="8"
                              HelperText="模块可自行解析该 JSON。若无需配置可留空。" />

                <MudNumericField @bind-Value="genericTotal" Label="总数（Total，可选）" Variant="Variant.Outlined" Min="0" Max="1000000"
                                 HelperText="用于进度条展示；若不确定可填 0，由执行器在运行时持续更新进度。" />
            }
        </MudStack>
    </DialogContent>
    <DialogActions>
        <MudButton Variant="Variant.Text" Color="Color.Default" OnClick="Cancel" Disabled="@creating">关闭</MudButton>
        <MudButton Variant="Variant.Filled" Color="Color.Primary" OnClick="Create" Disabled="@creating">
            @if (creating)
            {
                <MudProgressCircular Size="Size.Small" Indeterminate="true" Class="mr-2" />
                <span>提交中...</span>
            }
            else
            {
                <span>提交任务</span>
            }
        </MudButton>
    </DialogActions>
</MudDialog>

@code
{
    [CascadingParameter] private MudDialogInstance MudDialog { get; set; } = default!;

    private string _selectedCategory = "";
    private string selectedCategory
    {
        get => _selectedCategory;
        set
        {
            value = (value ?? "").Trim();
            if (string.Equals(_selectedCategory, value, StringComparison.OrdinalIgnoreCase))
                return;
            _selectedCategory = value;
            EnsureTaskTypeValid();
        }
    }
    private string _selectedTaskType = "";
    private string selectedTaskType
    {
        get => _selectedTaskType;
        set
        {
            value = (value ?? "").Trim();
            if (string.Equals(_selectedTaskType, value, StringComparison.OrdinalIgnoreCase))
                return;

            _selectedTaskType = value;
            ResolveEditorComponent();
        }
    }

    private bool creating;

    // generic task config
    private string genericConfigJson = "";
    private int genericTotal = 0;

    // module editor draft
    private TelegramPanel.Modules.ModuleTaskDraft editorDraft = new(0, null, false, null);
    private Type? editorComponentType;
    private Dictionary<string, object?> editorParameters = new();

    private IEnumerable<string> AvailableCategories =>
        Contributions.Tasks
            .Select(x => (x.Definition.Category ?? "").Trim())
            .Where(x => x.Length > 0)
            .Where(x => !IsSystemCategory(x))
            .Distinct(StringComparer.OrdinalIgnoreCase)
            .OrderBy(x => x, StringComparer.OrdinalIgnoreCase);

    private IEnumerable<TelegramPanel.Modules.ModuleTaskDefinition> AvailableOptions =>
        Contributions.Tasks
            .Select(x => x.Definition)
            .Where(o => !IsSystemCategory(o.Category))
            .Where(o => string.Equals(o.Category, selectedCategory, StringComparison.OrdinalIgnoreCase))
            .OrderBy(o => o.Order)
            .ThenBy(o => o.DisplayName);

    private TelegramPanel.Modules.ModuleTaskDefinition? CurrentOption =>
        !string.IsNullOrWhiteSpace(selectedTaskType)
        && Contributions.TaskTypeToDefinition.TryGetValue(selectedTaskType, out var reg)
            ? reg.Definition
            : null;

    protected override async Task OnInitializedAsync()
    {
        if (string.IsNullOrWhiteSpace(selectedCategory))
            selectedCategory = AvailableCategories.FirstOrDefault() ?? "user";

        EnsureTaskTypeValid();
        await Task.CompletedTask;
    }

    private void EnsureTaskTypeValid()
    {
        if (AvailableOptions.All(o => !string.Equals(o.TaskType, selectedTaskType, StringComparison.OrdinalIgnoreCase)))
        {
            selectedTaskType = AvailableOptions.FirstOrDefault()?.TaskType
                               ?? Contributions.Tasks.FirstOrDefault()?.Definition.TaskType
                               ?? "";
        }
    }

    private static string GetCategoryDisplayName(string category) => category switch
    {
        "user" => "用户任务",
        "bot" => "Bot 任务",
        "system" => "系统任务",
        _ => string.IsNullOrWhiteSpace(category) ? "-" : category
    };

    private static bool IsSystemCategory(string? category) =>
        string.Equals((category ?? "").Trim(), "system", StringComparison.OrdinalIgnoreCase);

    private void ResolveEditorComponent()
    {
        editorComponentType = null;
        editorParameters = new Dictionary<string, object?>();
        editorDraft = new TelegramPanel.Modules.ModuleTaskDraft(0, null, false, null);

        var opt = CurrentOption;
        if (opt == null || string.IsNullOrWhiteSpace(opt.EditorComponentType))
            return;

        if (!Contributions.TaskTypeToDefinition.TryGetValue(opt.TaskType, out var reg))
            return;

        editorComponentType = ModuleTaskEditorComponentResolver.ResolveCreateEditor(reg);

        if (editorComponentType == null)
            return;

        editorParameters = new Dictionary<string, object?>
        {
            ["Draft"] = editorDraft,
            ["DraftChanged"] = EventCallback.Factory.Create<TelegramPanel.Modules.ModuleTaskDraft>(this, OnEditorDraftChanged)
        };
    }

    private void OnEditorDraftChanged(TelegramPanel.Modules.ModuleTaskDraft draft)
    {
        editorDraft = draft;
    }
    private async Task Create()
    {
        if (creating)
            return;

        if (CurrentOption != null && !string.IsNullOrWhiteSpace(CurrentOption.CreateRoute))
        {
            Snackbar.Add("该任务建议使用独立页面创建，请点击“前往创建”。", Severity.Info);
            return;
        }

        if (CurrentOption != null && !string.IsNullOrWhiteSpace(CurrentOption.EditorComponentType) && editorComponentType != null)
        {
            if (!editorDraft.CanSubmit)
            {
                Snackbar.Add(string.IsNullOrWhiteSpace(editorDraft.ValidationError) ? "请先完善任务配置" : editorDraft.ValidationError!, Severity.Warning);
                return;
            }

            var config = string.IsNullOrWhiteSpace(editorDraft.Config) ? null : editorDraft.Config.Trim();
            if (!string.IsNullOrWhiteSpace(config))
            {
                try
                {
                    JsonDocument.Parse(config);
                }
                catch (Exception ex)
                {
                    Snackbar.Add($"配置 JSON 无效：{ex.Message}", Severity.Warning);
                    return;
                }
            }

            var total = editorDraft.Total < 0 ? 0 : editorDraft.Total;
            bool? confirm = await DialogService.ShowMessageBox(
                "确认提交任务",
                $"将提交任务类型：{selectedTaskType}，总数：{total}。是否继续？",
                yesText: "继续", cancelText: "取消");

            if (confirm != true)
                return;

            creating = true;
            try
            {
                var task = new BatchTask
                {
                    TaskType = selectedTaskType,
                    Total = total,
                    Completed = 0,
                    Failed = 0,
                    Config = config
                };

                var created = await TaskManagement.CreateTaskAsync(task);
                Snackbar.Add($"已提交后台任务 #{created.Id}（{selectedTaskType}）。请到【任务中心】查看进度。", Severity.Success);
                MudDialog.Close(DialogResult.Ok(created.Id));
            }
            catch (Exception ex)
            {
                Snackbar.Add($"提交失败：{ex.Message}", Severity.Error);
            }
            finally
            {
                creating = false;
            }

            return;
        }

        // Generic task create
        if (!string.IsNullOrWhiteSpace(genericConfigJson))
        {
            try
            {
                JsonDocument.Parse(genericConfigJson);
            }
            catch (Exception ex)
            {
                Snackbar.Add($"配置 JSON 无效：{ex.Message}", Severity.Warning);
                return;
            }
        }

        bool? genericConfirm = await DialogService.ShowMessageBox(
            "确认提交任务",
            $"将提交任务类型：{selectedTaskType}。是否继续？",
            yesText: "继续", cancelText: "取消");

        if (genericConfirm != true)
            return;

        creating = true;
        try
        {
            var task = new BatchTask
            {
                TaskType = selectedTaskType,
                Total = genericTotal,
                Completed = 0,
                Failed = 0,
                Config = string.IsNullOrWhiteSpace(genericConfigJson) ? null : genericConfigJson.Trim()
            };

            var created = await TaskManagement.CreateTaskAsync(task);
            Snackbar.Add($"已提交后台任务 #{created.Id}（{selectedTaskType}）。请到【任务中心】查看进度。", Severity.Success);
            MudDialog.Close(DialogResult.Ok(created.Id));
        }
        catch (Exception ex)
        {
            Snackbar.Add($"提交失败：{ex.Message}", Severity.Error);
        }
        finally
        {
            creating = false;
        }
    }

    private void NavigateTo(string url)
    {
        MudDialog.Close();
        Navigation.NavigateTo(url);
    }

    private async Task OpenCreateDialog(string route)
    {
        route = (route ?? "").Trim();
        if (route.Length == 0)
            return;

        // 仅对模块扩展页面提供“窗口打开”：/ext/{ModuleId}/{PageKey}
        if (!TryParseExtRoute(route, out var moduleId, out var pageKey))
        {
            Snackbar.Add("该任务未提供可窗口打开的模块页面，请使用“前往页面”。", Severity.Info);
            return;
        }

        var options = new DialogOptions { CloseOnEscapeKey = true, MaxWidth = MaxWidth.ExtraLarge, FullWidth = true };
        var parameters = new DialogParameters
        {
            ["ModuleId"] = moduleId,
            ["PageKey"] = pageKey
        };

        DialogService.Show<TelegramPanel.Web.Components.Dialogs.ModulePageDialog>("任务配置", parameters, options);
        await Task.CompletedTask;
    }

    private static bool TryParseExtRoute(string route, out string moduleId, out string pageKey)
    {
        moduleId = "";
        pageKey = "";

        route = (route ?? "").Trim();
        if (!route.StartsWith("/ext/", StringComparison.OrdinalIgnoreCase))
            return false;

        // /ext/{moduleId}/{pageKey}
        var parts = route.Split('/', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
        if (parts.Length < 3)
            return false;

        if (!string.Equals(parts[0], "ext", StringComparison.OrdinalIgnoreCase))
            return false;

        moduleId = parts[1];
        pageKey = parts[2];
        return moduleId.Length > 0 && pageKey.Length > 0;
    }

    private void Cancel() => MudDialog.Close();
}