<?php

namespace App\Http\Controllers;

use App\Models\Hotel;
use App\Models\Report;
use App\Services\RevenueManagementService;
use Illuminate\Http\Request;
use Symfony\Component\HttpFoundation\Response;

class ReportController extends Controller
{
    public function __construct(private RevenueManagementService $rms)
    {
    }

    public function index(Request $request)
    {
        $hotel = $this->hotel($request);
        $reports = Report::where('hotel_id', $hotel->id)->latest()->get();

        return view('rms.reports', compact('hotel', 'reports'));
    }

    public function generate(Request $request)
    {
        $data = $request->validate([
            'type' => ['required'],
            'period_start' => ['required', 'date'],
            'period_end' => ['required', 'date'],
        ]);
        $hotel = $this->hotel($request);
        $payload = $this->rms->reportPayload($hotel, $data['type'], $data['period_start'], $data['period_end']);
        Report::create($data + ['hotel_id' => $hotel->id, 'payload' => $payload]);

        return back()->with('status', 'Đã tạo báo cáo.');
    }

    public function export(Request $request, Report $report, string $format)
    {
        abort_unless($report->hotel_id === $this->hotel($request)->id, 403);
        $content = $format === 'excel'
            ? view('rms.report-export', ['report' => $report])->render()
            : $this->simplePdf($report);
        $extension = $format === 'excel' ? 'xls' : 'pdf';
        $contentType = $format === 'excel' ? 'application/vnd.ms-excel' : 'application/pdf';

        return new Response($content, 200, [
            'Content-Type' => $contentType,
            'Content-Disposition' => "attachment; filename=report-{$report->id}.{$extension}",
        ]);
    }

    private function hotel(Request $request): Hotel
    {
        return $request->user()->hotel_id ? Hotel::findOrFail($request->user()->hotel_id) : Hotel::firstOrFail();
    }

    private function simplePdf(Report $report): string
    {
        $lines = [
            'Hotel RMS Report',
            $report->type,
            $report->period_start.' - '.$report->period_end,
            'Occupancy: '.$report->payload['kpis']['occupancy'].'%',
            'ADR: '.$report->payload['kpis']['adr'],
            'RevPAR: '.$report->payload['kpis']['revpar'],
            'Total Revenue: '.$report->payload['kpis']['total_revenue'],
            'Recommendation: '.$report->payload['ai']['suggested_action'],
        ];
        $commands = collect($lines)
            ->map(fn ($line) => '('.str_replace(['\\', '(', ')'], ['\\\\', '\(', '\)'], $line).') Tj T*')
            ->implode(' ');
        $stream = "BT /F1 12 Tf 14 TL 72 760 Td {$commands} ET";
        $objects = [
            '1 0 obj << /Type /Catalog /Pages 2 0 R >> endobj',
            '2 0 obj << /Type /Pages /Kids [3 0 R] /Count 1 >> endobj',
            '3 0 obj << /Type /Page /Parent 2 0 R /MediaBox [0 0 612 792] /Resources << /Font << /F1 4 0 R >> >> /Contents 5 0 R >> endobj',
            '4 0 obj << /Type /Font /Subtype /Type1 /BaseFont /Helvetica >> endobj',
            '5 0 obj << /Length '.strlen($stream).' >> stream '.$stream.' endstream endobj',
        ];
        $pdf = "%PDF-1.4\n";
        $offsets = [0];
        foreach ($objects as $object) {
            $offsets[] = strlen($pdf);
            $pdf .= $object."\n";
        }
        $xref = strlen($pdf);
        $pdf .= "xref\n0 ".(count($objects) + 1)."\n0000000000 65535 f \n";
        foreach (array_slice($offsets, 1) as $offset) {
            $pdf .= str_pad((string) $offset, 10, '0', STR_PAD_LEFT)." 00000 n \n";
        }
        $pdf .= "trailer << /Size ".(count($objects) + 1)." /Root 1 0 R >>\nstartxref\n{$xref}\n%%EOF";

        return $pdf;
    }
}