<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\CertificateTemplate;
use App\Models\Program;
use App\Services\CertificateService;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\Storage;
use Illuminate\View\View;

class CertificateTemplateController extends Controller
{
    public function show(Program $program): View
    {
        $template = $program->certificateTemplate;
        return view('admin.programs.template.show', compact('program', 'template'));
    }

    public function store(Request $request, Program $program): RedirectResponse
    {
        $request->validate([
            'template_image' => 'required|image|mimes:jpg,jpeg,png|max:10240',
        ]);

        $file     = $request->file('template_image');
        $filename = $file->getClientOriginalName();
        $path     = $file->store('templates/' . $program->id, 'local');

        // Deactivate previous templates
        $program->certificateTemplates()->update(['is_active' => false]);

        $program->certificateTemplates()->create([
            'original_filename' => $filename,
            'image_path'        => $path,
            'is_active'         => true,
            'uploaded_by'       => auth()->id(),
            'config_json'       => $this->defaultConfig($file->getPath() . '/' . $file->getFilename()),
        ]);

        return redirect()->route('admin.programs.template.show', $program)
            ->with('success', 'Template sijil berjaya dimuat naik. Konfigurasi kedudukan teks di bawah.');
    }

    public function updateConfig(Request $request, Program $program): RedirectResponse
    {
        $template = $program->certificateTemplate;
        abort_if(! $template, 404);

        $request->validate([
            'fields'                  => 'required|array',
            'fields.*.x'              => 'required|integer|min:0',
            'fields.*.y'              => 'required|integer|min:0',
            'fields.*.font_size'      => 'required|integer|min:8|max:200',
            'fields.*.font_color'     => 'required|string|max:20',
            'fields.*.align'          => 'required|in:left,center,right',
        ]);

        $config = $template->config_json ?? [];
        $config['fields'] = array_merge($config['fields'] ?? [], $request->fields);

        $template->update(['config_json' => $config]);

        return redirect()->route('admin.programs.template.show', $program)
            ->with('success', 'Konfigurasi template berjaya dikemaskini.');
    }

    public function destroy(Program $program): RedirectResponse
    {
        $template = $program->certificateTemplate;
        abort_if(! $template, 404);

        Storage::disk('local')->delete($template->image_path);
        $template->delete();

        return redirect()->route('admin.programs.template.show', $program)
            ->with('success', 'Template sijil dipadam.');
    }

    public function preview(Program $program): Response
    {
        $template = $program->certificateTemplate;
        abort_if(! $template, 404);

        $content = Storage::disk('local')->get($template->image_path);

        return response($content, 200, [
            'Content-Type'        => 'image/jpeg',
            'Content-Disposition' => 'inline',
            'Cache-Control'       => 'private, max-age=3600',
        ]);
    }

    public function testGenerate(Request $request, Program $program, CertificateService $service): \Illuminate\Http\Response|\Illuminate\Http\JsonResponse
    {
        $template = $program->certificateTemplate;
        abort_if(! $template, 404);

        $sampleName = $request->input('sample_name', 'NAMA PESERTA CONTOH');
        $sampleNo   = $request->input('sample_no', 'ECT/2025/0001');

        // Bina override dari nilai form semasa (belum disimpan)
        // Gabung dengan config tersimpan supaya font_file & valign kekal
        $liveFields = null;
        if ($request->has('fields') && is_array($request->input('fields'))) {
            $saved      = $template->config_json['fields'] ?? [];
            $liveFields = [];
            foreach ($request->input('fields') as $key => $cfg) {
                $liveFields[$key] = array_merge($saved[$key] ?? [], array_filter($cfg, fn($v) => $v !== null && $v !== ''));
            }
        }

        try {
            $imageData = $service->generatePreview($template, $sampleName, $sampleNo, $liveFields);
        } catch (\Throwable $e) {
            return response()->json(['error' => $e->getMessage()], 500);
        }

        return response($imageData, 200, [
            'Content-Type'        => 'image/jpeg',
            'Content-Disposition' => 'inline; filename="preview.jpg"',
        ]);
    }

    private function defaultConfig(string $imagePath): array
    {
        [$width, $height] = getimagesize($imagePath) + [0, 0, 0, 0];

        $cx = (int) round(($width ?: 1600) / 2);
        $cy = (int) round(($height ?: 1100) * 0.52);

        return [
            'width'  => $width  ?: 1600,
            'height' => $height ?: 1100,
            'fields' => [
                'name' => [
                    'x'          => $cx,
                    'y'          => $cy,
                    'font_size'  => 52,
                    'font_color' => '#1a3a6b',
                    'font_file'  => 'DejaVuSans-Bold.ttf',
                    'align'      => 'center',
                    'valign'     => 'top',
                ],
            ],
        ];
    }
}