<?php

namespace App\Filament\Pages;

use App\Services\KnowledgeGraphService;
use Filament\Actions\Action;
use Filament\Forms\Components\FileUpload;
use Filament\Forms\Components\Select;
use Filament\Forms\Components\Textarea;
use Filament\Forms\Components\TextInput;
use Filament\Notifications\Notification;
use Filament\Pages\Page;
use Filament\Support\Enums\ActionSize;
use Illuminate\Support\Facades\Storage;

class KnowledgeGraphManagement extends Page
{
    protected static string|\BackedEnum|null $navigationIcon = 'heroicon-o-rectangle-stack';
    protected static string|\UnitEnum|null $navigationGroup = '知识图谱系统';
    protected static ?int $navigationSort = 1;
    protected static ?string $navigationLabel = '知识图谱管理';
    protected static ?string $title = '知识图谱管理';
    protected string $view = 'filament.pages.knowledge-graph-management';

    public array $knowledgePoints = [];

    public function mount(KnowledgeGraphService $service): void
    {
        $this->knowledgePoints = $service->listKnowledgePoints(1, 1000);
    }

    public function edit(string $code): void
    {
        $this->mountAction('edit', ['code' => $code]);
    }

    public function delete(string $code): void
    {
        $this->mountAction('delete', ['code' => $code]);
    }

    protected function getHeaderActions(): array
    {
        return [
            Action::make('create')
                ->label('新增知识点')
                ->form([
                    TextInput::make('cn_name')->label('中文名称')->required(),
                    TextInput::make('en_name')->label('英文名称'),
                    TextInput::make('kp_code')->label('知识点编码')->placeholder('自动生成或手动输入'),
                    Select::make('phase')->label('学段')->options([
                        '小学' => '小学', '初中' => '初中', '高中' => '高中'
                    ])->required(),
                    Select::make('grade')->label('年级')->options([
                        7 => '七年级', 8 => '八年级', 9 => '九年级'
                    ]),
                    TextInput::make('category')->label('分类')->default('数学'),
                    TextInput::make('importance')->label('重要性')->numeric()->default(5),
                    Textarea::make('description')->label('描述'),
                ])
                ->action(function (array $data, KnowledgeGraphService $service) {
                    if ($service->createKnowledgePoint($data)) {
                        Notification::make()->title('创建成功')->success()->send();
                        $this->mount($service);
                    } else {
                        Notification::make()->title('创建失败')->danger()->send();
                    }
                }),
            Action::make('import')
                ->label('导入图谱数据')
                ->color('gray')
                ->form([
                    FileUpload::make('tree_file')
                        ->label('Tree JSON (知识点结构)')
                        ->required()
                        ->storeFiles(false),
                    FileUpload::make('edges_file')
                        ->label('Edges JSON (依赖关系)')
                        ->required()
                        ->storeFiles(false),
                ])
                ->action(function (array $data, KnowledgeGraphService $service) {
                    try {
                        $treePath = $data['tree_file'];
                        $edgesPath = $data['edges_file'];
                        
                        if (is_array($treePath)) $treePath = reset($treePath);
                        if (is_array($edgesPath)) $edgesPath = reset($edgesPath);

                        $treeContent = json_decode(Storage::disk('public')->get($treePath), true);
                        $edgesContent = json_decode(Storage::disk('public')->get($edgesPath), true);

                        if (!$treeContent || !$edgesContent) {
                            Notification::make()->title('文件解析失败')->danger()->send();
                            return;
                        }

                        if ($service->importGraph($treeContent, $edgesContent)) {
                            Notification::make()->title('导入成功')->success()->send();
                            $this->mount($service);
                        } else {
                            Notification::make()->title('导入失败')->danger()->send();
                        }
                    } catch (\Exception $e) {
                         Notification::make()->title('导入异常')->body($e->getMessage())->danger()->send();
                    }
                })
        ];
    }

    public function editAction(): Action
    {
        return Action::make('edit')
            ->label('编辑')
            ->modalHeading('编辑知识点')
            ->form([
                TextInput::make('cn_name')->label('中文名称')->required(),
                TextInput::make('en_name')->label('英文名称'),
                Select::make('phase')->label('学段')->options([
                    '小学' => '小学', '初中' => '初中', '高中' => '高中'
                ])->required(),
                Select::make('grade')->label('年级')->options([
                    7 => '七年级', 8 => '八年级', 9 => '九年级'
                ]),
                TextInput::make('category')->label('分类'),
                TextInput::make('importance')->label('重要性')->numeric(),
                Textarea::make('description')->label('描述'),
            ])
            ->fillForm(function (array $arguments, KnowledgeGraphService $service) {
                $code = $arguments['code'];
                $data = $service->getKnowledgePoint($code);
                return $data ?? [];
            })
            ->action(function (array $data, array $arguments, KnowledgeGraphService $service) {
                if ($service->updateKnowledgePoint($arguments['code'], $data)) {
                    Notification::make()->title('更新成功')->success()->send();
                    $this->mount($service);
                } else {
                    Notification::make()->title('更新失败')->danger()->send();
                }
            });
    }

    public function deleteAction(): Action
    {
        return Action::make('delete')
            ->label('删除')
            ->requiresConfirmation()
            ->action(function (array $arguments, KnowledgeGraphService $service) {
                if ($service->deleteKnowledgePoint($arguments['code'])) {
                    Notification::make()->title('删除成功')->success()->send();
                    $this->mount($service);
                } else {
                    Notification::make()->title('删除失败')->danger()->send();
                }
            });
    }
}