<?php

namespace App\Http\Controllers;

use App\Models\Investigation;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\View\View;

class InvestigationReportController extends Controller
{
    public function show(Request $request, Investigation $investigation): View
    {
        $this->authorize('view', $investigation);

        $investigation->load(['owner', 'targets.creator', 'targets.findings.source']);

        return view('investigations.report', compact('investigation'));
    }

    public function csv(Request $request, Investigation $investigation): Response
    {
        $this->authorize('view', $investigation);

        $investigation->load(['targets.findings.source']);

        $rows = ["target_type,target_value,source,status,summary,ran_at\n"];

        foreach ($investigation->targets as $target) {
            foreach ($target->findings as $finding) {
                $rows[] = implode(',', array_map(
                    fn ($v) => '"'.str_replace('"', '""', $this->csvSafe($v)).'"',
                    [
                        $target->type,
                        $target->value,
                        $finding->source->name,
                        $finding->status,
                        $finding->summary,
                        $finding->ran_at,
                    ]
                ))."\n";
            }
        }

        $filename = 'investigation-'.$investigation->id.'-findings.csv';

        return response(implode('', $rows), 200, [
            'Content-Type' => 'text/csv',
            'Content-Disposition' => "attachment; filename=\"{$filename}\"",
        ]);
    }

    /**
     * Prefix values that Excel/Sheets would interpret as a formula, to
     * prevent CSV injection via user-controlled target values or finding
     * summaries pulled from external tool output.
     */
    private function csvSafe(mixed $value): string
    {
        $value = (string) $value;

        return preg_match('/^[=+\-@\t\r]/', $value) ? "'".$value : $value;
    }

    public function json(Request $request, Investigation $investigation): JsonResponse
    {
        $this->authorize('view', $investigation);

        $investigation->load(['owner', 'targets.creator', 'targets.findings.source']);

        $filename = 'investigation-'.$investigation->id.'.json';

        return response()->json([
            'name' => $investigation->name,
            'description' => $investigation->description,
            'status' => $investigation->status,
            'owner' => $investigation->owner->name,
            'created_at' => $investigation->created_at,
            'targets' => $investigation->targets->map(fn ($target) => [
                'type' => $target->type,
                'value' => $target->value,
                'notes' => $target->notes,
                'created_by' => $target->creator->name,
                'findings' => $target->findings->map(fn ($finding) => [
                    'source' => $finding->source->name,
                    'status' => $finding->status,
                    'summary' => $finding->summary,
                    'raw_payload' => $finding->raw_payload,
                    'ran_at' => $finding->ran_at,
                ]),
            ]),
        ])->withHeaders([
            'Content-Disposition' => "attachment; filename=\"{$filename}\"",
        ]);
    }
}