<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\QrTeamMember;
use App\Models\User;
use Illuminate\Http\Client\ConnectionException;
use Illuminate\Http\Client\Response as HttpResponse;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Http;
use Illuminate\Validation\ValidationException;

/**
 * Native token auth for the Ladill Mini mobile app.
 *
 * Login and registration proxy to the central Ladill identity API
 * (auth.ladill.com /api/identity/auth/*, gated by the shared first-party
 * service key) so app accounts are the same single identity used by the website
 * and every other Ladill app. We then provision the thin local user mirror
 * (keyed by the OIDC `sub`, exactly like the web SSO callback) and hand back a
 * Sanctum token the app uses for `auth:sanctum` requests.
 */
class AuthController extends Controller
{
    public function login(Request $request): JsonResponse
    {
        $credentials = $request->validate([
            'email' => ['required', 'email'],
            'password' => ['required', 'string'],
            'device_name' => ['nullable', 'string', 'max:120'],
        ]);

        $response = $this->identityPost('/api/identity/auth/login', [
            'email' => $credentials['email'],
            'password' => $credentials['password'],
        ]);

        if ($response->status() === 422) {
            throw ValidationException::withMessages([
                'email' => ['The email or password is incorrect.'],
            ]);
        }

        $user = $this->provisionFromResponse($response);

        return $this->issueToken($user, $credentials['device_name'] ?? null);
    }

    public function register(Request $request): JsonResponse
    {
        // Mirror the web signup form; the monolith validates authoritatively, but
        // we pre-validate so the app gets fast, field-level feedback.
        $data = $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'email' => ['required', 'email', 'max:255'],
            'password' => ['required', 'string', 'min:8', 'confirmed'],
            'company' => ['nullable', 'string', 'max:255'],
            'address' => ['required', 'string', 'max:255'],
            'city' => ['required', 'string', 'max:255'],
            'state' => ['required', 'string', 'max:255'],
            'country' => ['required', 'string', 'size:2'],
            'zipcode' => ['required', 'string', 'max:32'],
            'phone_cc' => ['required', 'string', 'max:8'],
            'phone' => ['required', 'string', 'max:32'],
            'mobile_cc' => ['nullable', 'string', 'max:8'],
            'mobile' => ['nullable', 'string', 'max:32'],
            'terms' => ['accepted'],
            'device_name' => ['nullable', 'string', 'max:120'],
        ]);

        $response = $this->identityPost('/api/identity/auth/register', array_merge(
            $request->only([
                'name', 'email', 'password', 'password_confirmation', 'company',
                'address', 'city', 'state', 'country', 'zipcode',
                'phone_cc', 'phone', 'mobile_cc', 'mobile',
            ]),
            ['terms' => $request->boolean('terms')],
        ));

        // Surface the monolith's validation errors (e.g. email already taken).
        if ($response->status() === 422) {
            throw ValidationException::withMessages(
                $response->json('errors') ?: ['email' => [$response->json('message') ?: 'Registration failed.']],
            );
        }

        $user = $this->provisionFromResponse($response);

        return $this->issueToken($user, $data['device_name'] ?? null);
    }

    public function logout(Request $request): JsonResponse
    {
        $request->user()?->currentAccessToken()?->delete();

        return response()->json(['data' => ['message' => 'Signed out.']]);
    }

    public function me(Request $request): JsonResponse
    {
        return response()->json(['data' => $this->presentUser($request->user())]);
    }

    private function identity(): \Illuminate\Http\Client\PendingRequest
    {
        return Http::baseUrl(rtrim((string) config('services.ladill_identity.url'), '/'))
            ->withToken((string) config('services.ladill_identity.key'))
            ->connectTimeout(10)
            ->timeout(20)
            ->acceptJson()
            ->asJson();
    }

    /** POST to the identity API, turning connection failures into a clean message. */
    private function identityPost(string $path, array $payload): HttpResponse
    {
        try {
            return $this->identity()->post($path, $payload);
        } catch (ConnectionException $e) {
            throw ValidationException::withMessages([
                'email' => ['Could not reach Ladill sign-in. Please try again in a moment.'],
            ]);
        }
    }

    /** Upsert the local mirror from the identity API's OIDC claims. */
    private function provisionFromResponse(HttpResponse $response): User
    {
        if ($response->failed()) {
            throw ValidationException::withMessages([
                'email' => ['We could not reach Ladill sign-in. Please try again.'],
            ]);
        }

        $claims = (array) $response->json('data.user', []);
        $sub = (string) ($claims['sub'] ?? '');

        if ($sub === '') {
            throw ValidationException::withMessages([
                'email' => ['We could not verify your Ladill account. Please try again.'],
            ]);
        }

        $email = (string) ($claims['email'] ?? '');

        return User::updateOrCreate(
            ['public_id' => $sub],
            [
                'name' => $claims['name'] ?? null,
                'email' => $email !== '' ? $email : $sub.'@users.ladill.com',
                'avatar_url' => $claims['picture'] ?? null,
            ],
        );
    }

    private function issueToken(User $user, ?string $deviceName): JsonResponse
    {
        QrTeamMember::linkPendingInvitesFor($user);

        $token = $user->createToken($deviceName ?: 'Ladill Mini Android', ['mini:read', 'mini:write']);

        return response()->json([
            'data' => [
                'token' => $token->plainTextToken,
                'user' => $this->presentUser($user),
            ],
        ]);
    }

    /** @return array<string, mixed> */
    private function presentUser(User $user): array
    {
        // On the public login/register routes SetActingAccount hasn't run and
        // there's no authenticated guard yet, so ladill_account() is null —
        // the acting account at sign-in is simply the user themselves.
        $account = ladill_account() ?? $user;

        return [
            'id' => $user->id,
            'public_id' => $user->public_id,
            'name' => $user->name,
            'email' => $user->email,
            'avatar_url' => $user->avatarUrl(),
            'acting_account' => [
                'id' => $account->id,
                'public_id' => $account->public_id,
                'name' => $account->name,
                'email' => $account->email,
            ],
            'accessible_account_ids' => $user->accessibleAccounts()->pluck('id')->values(),
        ];
    }
}