<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\DeviceCode;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class CliDeviceController extends Controller
{
    /**
     * Step 1: the CLI asks for a device code. Public but rate-limited —
     * this is the front door for the Geekbench-style login flow.
     */
    public function request(Request $request): JsonResponse
    {
        $request->validate(['api' => ['nullable', 'string', 'max:32']]);

        $code = DeviceCode::generateCode();
        $pollToken = DeviceCode::generatePollToken();

        DeviceCode::create([
            'code' => $code,
            'poll_token_hash' => hash('sha256', $pollToken),
            'expires_at' => now()->addMinutes(10),
        ]);

        return response()->json([
            'code' => $code,
            'poll_token' => $pollToken,
            'verify_url' => url('/cli/authorize/'.$code),
            'expires_in' => 600,
        ], 201);
    }

    /**
     * Step 3: the CLI polls until the user confirms in the browser.
     * Returns pending / expired / granted{token}.
     */
    public function poll(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'code' => ['required', 'string'],
            'poll_token' => ['required', 'string'],
        ]);

        $device = DeviceCode::where('code', $validated['code'])->first();

        if ($device === null || ! hash_equals($device->poll_token_hash, hash('sha256', $validated['poll_token']))) {
            // Same answer for unknown code and wrong token: no oracle.
            return response()->json(['status' => 'unknown'], 404);
        }

        if ($device->expires_at->isPast()) {
            return response()->json(['status' => 'expired']);
        }

        if ($device->consumed_at !== null) {
            // The token can be picked up exactly once by poll; a later poll
            // after consumption is a replay and gets a bare granted status.
            return response()->json(['status' => 'granted']);
        }

        if ($device->user_id === null) {
            return response()->json(['status' => 'pending']);
        }

        $token = $device->personalAccessToken;

        if ($token === null || $token->expires_at !== null && $token->expires_at->isPast()) {
            return response()->json(['status' => 'expired']);
        }

        $device->forceFill(['consumed_at' => now()])->save();

        return response()->json([
            'status' => 'granted',
            'token' => $token->token,
            'abilities' => $token->abilities,
        ]);
    }
}