<?php

namespace App\Http\Controllers\Api\Admin;

use App\Http\Controllers\Controller;
use App\Http\Requests\Admin\StoreSignupChannelRequest;
use App\Http\Requests\Admin\UpdateSignupChannelRequest;
use App\Models\Competition;
use App\Models\SignupChannel;
use App\Support\ChannelEntryEncryption;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Response;

class SignupChannelController extends Controller
{
    public function index(Competition $competition): JsonResponse
    {
        $channels = $competition->signupChannels()
            ->orderByDesc('id')
            ->get()
            ->map(fn (SignupChannel $channel) => $this->toSummary($channel, $competition))
            ->values();

        return response()->json([
            'data' => $channels,
        ]);
    }

    public function store(StoreSignupChannelRequest $request, Competition $competition): JsonResponse
    {
        /** @var SignupChannel $channel */
        $channel = $competition->signupChannels()->create(
            $this->normalizePayload($request->validated(), true)
        );

        return response()->json($this->toDetail($channel, $competition), 201);
    }

    public function show(Competition $competition, SignupChannel $signupChannel): JsonResponse
    {
        $this->assertChannelBelongs($competition, $signupChannel);
        $this->ensureEncryptionKeyPair($signupChannel);

        return response()->json($this->toDetail($signupChannel, $competition));
    }

    public function update(
        UpdateSignupChannelRequest $request,
        Competition $competition,
        SignupChannel $signupChannel
    ): JsonResponse {
        $this->assertChannelBelongs($competition, $signupChannel);

        $signupChannel->fill($this->normalizePayload($request->validated()));
        $signupChannel->ensureEncryptionKeyPair();
        $signupChannel->save();

        return response()->json($this->toDetail($signupChannel, $competition));
    }

    public function destroy(Competition $competition, SignupChannel $signupChannel): Response
    {
        $this->assertChannelBelongs($competition, $signupChannel);
        $signupChannel->delete();

        return response()->noContent();
    }

    /**
     * @return array<string, mixed>
     */
    private function toSummary(SignupChannel $channel, Competition $competition): array
    {
        return [
            'id' => $channel->id,
            'competition_id' => $channel->competition_id,
            'competition_name' => $competition->name,
            'channel_code' => $channel->channel_code,
            'channel_name' => $channel->channel_name,
            'status' => $channel->status,
            'encryption_algorithm' => $channel->encryption_algorithm ?: ChannelEntryEncryption::ALGORITHM,
            'entry_encryption_enabled' => (bool) $channel->entry_encryption_enabled,
            'success_callback_url' => $channel->success_callback_url,
            'remark' => $channel->remark,
            'created_at' => $channel->created_at?->toIso8601String(),
            'updated_at' => $channel->updated_at?->toIso8601String(),
        ];
    }

    /**
     * @return array<string, mixed>
     */
    private function toDetail(SignupChannel $channel, Competition $competition): array
    {
        $row = $this->toSummary($channel, $competition);
        $row['shared_secret'] = $channel->shared_secret;
        $row['encryption_public_key'] = $channel->encryption_public_key;

        return $row;
    }

    private function assertChannelBelongs(Competition $competition, SignupChannel $channel): void
    {
        if ((int) $channel->competition_id !== (int) $competition->id) {
            abort(404);
        }
    }

    private function ensureEncryptionKeyPair(SignupChannel $channel): void
    {
        $channel->ensureEncryptionKeyPair();
        if ($channel->isDirty()) {
            $channel->save();
        }
    }

    /**
     * @param  array<string, mixed>  $payload
     * @return array<string, mixed>
     */
    private function normalizePayload(array $payload, bool $isCreate = false): array
    {
        if ($isCreate || array_key_exists('success_callback_url', $payload)) {
            $payload['success_callback_url'] = trim((string) ($payload['success_callback_url'] ?? ''));
        }

        return $payload;
    }
}