<?php

namespace App\Http\Controllers;

use App\Models\User;
use Exception;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Laravel\Socialite\Facades\Socialite;

class LoginController extends Controller
{
    /**
     * Show the login selection screen or redirect if already authenticated.
     */
    public function showLoginForm()
    {
        if (Auth::check()) {
            return $this->redirectUserBasedOnRole(Auth::user());
        }

        return view('auth.login');
    }

    /**
     * Handle Email & Password login for Administrators.
     */
    public function adminLogin(Request $request)
    {
        $credentials = $request->validate([
            'email' => ['required', 'email'],
            'password' => ['required'],
        ]);

        if (Auth::attempt($credentials, $request->boolean('remember'))) {
            $user = Auth::user();

            // Enforce that only administrators can log in via credentials
            if ($user->role === 'admin') {
                $request->session()->regenerate();
                return redirect()->intended(route('admin.dashboard'))
                    ->with('success', 'Logged in successfully as Admin.');
            }

            // Log out unauthorized user immediately
            Auth::logout();
            $request->session()->invalidate();
            $request->session()->regenerateToken();

            return back()->withErrors([
                'email' => 'Access denied. The provided credentials do not belong to an Administrator.',
            ])->onlyInput('email');
        }

        return back()->withErrors([
            'email' => 'The provided credentials do not match our records.',
        ])->onlyInput('email');
    }

    /**
     * Redirect the user to the Microsoft Azure authentication page.
     */
    public function redirectToMicrosoft()
    {
        try {
            return Socialite::driver('microsoft')->redirect();
        } catch (Exception $e) {
            \Illuminate\Support\Facades\Log::error('Microsoft Authentication redirect failed', [
                'message' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);
            return redirect()->route('login')->with('error', 'Unable to redirect to Microsoft: ' . $e->getMessage());
        }
    }

    /**
     * Obtain the user information from Microsoft Azure.
     */
    public function handleMicrosoftCallback(Request $request)
    {
        try {
            $microsoftUser = Socialite::driver('microsoft')->user();
        } catch (Exception $e) {
            \Illuminate\Support\Facades\Log::error('Microsoft Authentication callback failed', [
                'message' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);
            return redirect()->route('login')->with('error', 'Microsoft Authentication failed or was cancelled: ' . $e->getMessage());
        }

        // Search for user by microsoft_id first, then by email
        $user = User::where('microsoft_id', $microsoftUser->getId())->first();

        if (!$user) {
            $user = User::where('email', $microsoftUser->getEmail())->first();
        }

        if ($user) {
            // Update existing user with Microsoft data if not already set
            $user->update([
                'microsoft_id' => $microsoftUser->getId(),
                'microsoft_token' => $microsoftUser->token,
                'microsoft_refresh_token' => $microsoftUser->refreshToken ?? $user->microsoft_refresh_token,
                'avatar' => $microsoftUser->getAvatar() ?? $user->avatar,
            ]);
        } else {
            // Create a new User (defaults to 'user' role)
            $user = User::create([
                'name' => $microsoftUser->getName() ?? explode('@', $microsoftUser->getEmail())[0],
                'email' => $microsoftUser->getEmail(),
                'microsoft_id' => $microsoftUser->getId(),
                'microsoft_token' => $microsoftUser->token,
                'microsoft_refresh_token' => $microsoftUser->refreshToken ?? null,
                'avatar' => $microsoftUser->getAvatar(),
                'role' => 'user',
            ]);
        }

        Auth::login($user, true);
        $request->session()->regenerate();

        return $this->redirectUserBasedOnRole($user);
    }

    /**
     * Log the user out of the application.
     */
    public function logout(Request $request)
    {
        Auth::logout();

        $request->session()->invalidate();
        $request->session()->regenerateToken();

        return redirect()->route('login')->with('success', 'Logged out successfully.');
    }

    /**
     * Helper method to redirect user depending on their role.
     */
    protected function redirectUserBasedOnRole($user)
    {
        if ($user->role === 'admin') {
            return redirect()->route('admin.dashboard');
        }

        return redirect()->route('dashboard');
    }
}