<?php

namespace App\Services\Auth;

use App\Enums\ConversionSource;
use App\Models\MagicLink;
use App\Models\PressRelease;
use App\Models\User;
use Illuminate\Support\Carbon;
use Illuminate\Support\Str;

class MagicLinkGenerator
{
    /**
     * @param  array<string, mixed>  $payload  z. B. `company_id`, auf dessen Firmenseite der Login landen soll (Roadmap 1b.2)
     * @return array{magic_link: MagicLink, plain_token: string, expires_at: Carbon}
     */
    public function createLoginLink(
        User $user,
        ?string $requestedIp = null,
        int $ttlMinutes = 15,
        ?ConversionSource $source = null,
        array $payload = [],
    ): array {
        $plainToken = Str::random(64);
        $tokenHash = hash('sha256', $plainToken);
        $expiresAt = now()->addMinutes($ttlMinutes);

        MagicLink::query()
            ->where('user_id', $user->id)
            ->where('purpose', 'login')
            ->whereNull('consumed_at')
            ->update([
                'consumed_at' => now(),
                'ip_consumed' => $requestedIp,
            ]);

        $magicLink = $user->magicLinks()->create([
            'token_hash' => $tokenHash,
            'purpose' => 'login',
            // Herkunft gehört auf das Token, nicht in die Session: Die Strecke
            // führt über zwei Domains und einen Mailclient, die Sitzung reißt
            // dabei genau an der interessanten Stelle (Roadmap 0.4).
            'source' => $source?->value,
            'payload' => $payload ?: null,
            'expires_at' => $expiresAt,
            'ip_requested' => $requestedIp,
        ]);

        return [
            'magic_link' => $magicLink,
            'plain_token' => $plainToken,
            'expires_at' => $expiresAt,
        ];
    }

    /**
     * Link „Bild bestätigen" für den Kontoinhaber (Decision-Update E10,
     * Umsetzungsaudit 29.09.2026 B-10): meldet wie ein Login-Link an und
     * führt auf die Meldung, hat aber einen eigenen Zweck. Spätere
     * Login-Links entwerten ihn deshalb nicht; ein neuer Bestätigungslink
     * für dasselbe Bild entwertet nur den vorherigen für dieses Bild.
     *
     * @param  array<string, mixed>  $payload  Landeziel (`company_id`, `press_release_id`)
     * @return array{magic_link: MagicLink, plain_token: string, expires_at: Carbon}
     */
    public function createImageConfirmationLink(
        User $user,
        int $imageId,
        array $payload,
        ?string $requestedIp,
        int $ttlMinutes,
        ?ConversionSource $source = null,
    ): array {
        $plainToken = Str::random(64);
        $expiresAt = now()->addMinutes($ttlMinutes);

        MagicLink::query()
            ->where('user_id', $user->id)
            ->where('purpose', MagicLink::PURPOSE_IMAGE_CONFIRMATION)
            ->whereNull('consumed_at')
            ->where('payload->image_confirmation', $imageId)
            ->update([
                'consumed_at' => now(),
                'ip_consumed' => $requestedIp,
            ]);

        $magicLink = $user->magicLinks()->create([
            'token_hash' => hash('sha256', $plainToken),
            'purpose' => MagicLink::PURPOSE_IMAGE_CONFIRMATION,
            'source' => $source?->value,
            'payload' => ['image_confirmation' => $imageId] + $payload,
            'expires_at' => $expiresAt,
            'ip_requested' => $requestedIp,
        ]);

        return [
            'magic_link' => $magicLink,
            'plain_token' => $plainToken,
            'expires_at' => $expiresAt,
        ];
    }

    /**
     * Meldeverfahren (Phase 3): Verifikations-Link an die hinterlegte
     * Pressekontaktadresse. Wer den Link öffnet, ist strukturell verifiziert —
     * kein Ermessen, kein Ausweis. Ältere unverbrauchte Report-Links derselben
     * PM werden entwertet (nur der jüngste Link zählt).
     *
     * @return array{magic_link: MagicLink, plain_token: string, expires_at: Carbon}
     */
    public function createReportLink(PressRelease $pressRelease, string $contactEmail, ?int $ttlHours = null): array
    {
        $plainToken = Str::random(64);
        $tokenHash = hash('sha256', $plainToken);
        $expiresAt = now()->addHours($ttlHours ?? (int) config('legal.report_link_ttl_hours'));

        MagicLink::query()
            ->where('purpose', 'press_release_report')
            ->whereNull('consumed_at')
            ->where('payload->press_release_id', $pressRelease->id)
            ->update(['consumed_at' => now()]);

        $magicLink = MagicLink::query()->create([
            'user_id' => $pressRelease->user_id,
            'token_hash' => $tokenHash,
            'purpose' => 'press_release_report',
            'payload' => [
                'press_release_id' => $pressRelease->id,
                'contact_email' => $contactEmail,
            ],
            'expires_at' => $expiresAt,
        ]);

        return [
            'magic_link' => $magicLink,
            'plain_token' => $plainToken,
            'expires_at' => $expiresAt,
        ];
    }

    /**
     * Public read-only share link for a press release. Token holder can view
     * the press release in any state (draft/review/rejected/published) until
     * the link expires. Default TTL: 7 days.
     *
     * @return array{magic_link: MagicLink, plain_token: string, url: string, expires_at: Carbon}
     */
    public function createPressReleaseShareLink(PressRelease $pressRelease, ?User $issuer = null, int $ttlDays = 7): array
    {
        $plainToken = Str::random(64);
        $tokenHash = hash('sha256', $plainToken);
        $expiresAt = now()->addDays($ttlDays);

        $magicLink = MagicLink::query()->create([
            'user_id' => $issuer?->id ?? $pressRelease->user_id,
            'token_hash' => $tokenHash,
            'purpose' => 'press_release_access',
            'payload' => [
                'press_release_id' => $pressRelease->id,
            ],
            'expires_at' => $expiresAt,
        ]);

        return [
            'magic_link' => $magicLink,
            'plain_token' => $plainToken,
            'url' => route('press-releases.preview', ['token' => $plainToken]),
            'expires_at' => $expiresAt,
        ];
    }
}