<?php

namespace App\Http\Controllers\Api;

use App\Models\ClassSection;
use App\Models\Configuration;
use App\Models\Invoice;
use App\Models\StudentClass;
use App\Models\TeacherClass;
use App\Models\UserRole;
use Illuminate\Support\Facades\DB;
use Symfony\Component\HttpFoundation\Response;

class LandingPageController extends BaseApiController
{
    protected Configuration $config;
    protected StudentClass $studentClass;
    protected Invoice $invoice;
    protected UserRole $userRole;
    protected TeacherClass $teacherClass;

    protected string $schoolYear;
    protected string $semester;
    protected ?string $lastDayOfRegistration;
    protected ?string $refundDeadline;
    protected ?int $classSectionId;

    public function __construct()
    {
        parent::__construct();
        $this->config = model(Configuration::class);
        $this->studentClass = model(StudentClass::class);
        $this->invoice = model(Invoice::class);
        $this->userRole = model(UserRole::class);
        $this->teacherClass = model(TeacherClass::class);

        // Fetch Enrollment and Refund Deadlines from Configuration
        $this->schoolYear = (string) ($this->config->getConfig('school_year') ?? '');
        $this->semester = (string) ($this->config->getConfig('semester') ?? '');
        $this->lastDayOfRegistration = $this->config->getConfig('enrollment_deadline') ?? 'Not set';
        $this->refundDeadline = $this->config->getConfig('refund_deadline') ?? 'Not set';

        // Get class_id and store it in session
        $this->classSectionId = $this->classSectionId();
        if ($this->classSectionId) {
            session()->put('class_section_id', $this->classSectionId);
        }
    }

    /**
     * GET /api/v1/landing
     * Get landing page data based on user role
     */
    public function index()
    {
        $user = $this->getCurrentUser();
        if (!$user) {
            return $this->respondError('Authentication required', Response::HTTP_UNAUTHORIZED);
        }

        $userRole = $this->getUserRole();
        $role = strtolower($userRole);

        switch ($role) {
            case 'administrator':
                return $this->administrator();
            case 'admin':
                return $this->admin();
            case 'teacher':
                return $this->teacher();
            case 'student':
                return $this->student();
            case 'parent':
            case 'authorized_user':
                return $this->parentDashboard();
            default:
                return $this->guest();
        }
    }

    /**
     * GET /api/v1/landing/data
     * Get basic landing page data (backward compatibility)
     */
    public function getData()
    {
        $user = $this->getCurrentUser();
        if (!$user) {
            return $this->respondError('Authentication required', Response::HTTP_UNAUTHORIZED);
        }

        try {
            $payload = [
                'school_year' => $this->schoolYear,
                'semester' => $this->semester,
                'enrollment_deadline' => $this->lastDayOfRegistration,
                'refund_deadline' => $this->refundDeadline,
                'class_section_id' => $this->classSectionId,
                'user_role' => session()->get('active_role') ?? $this->getUserRole(),
            ];

            return $this->success($payload, 'Landing page data retrieved successfully');
        } catch (\Throwable $e) {
            log_message('error', 'Landing page data error: ' . $e->getMessage());
            return $this->respondError('Failed to retrieve landing page data', Response::HTTP_INTERNAL_SERVER_ERROR);
        }
    }

    protected function classSectionId(): ?int
    {
        $userId = $this->getCurrentUserId();
        if (!$userId) {
            return null;
        }

        $teacherClass = $this->teacherClass->getClassSectionIdByUserId($userId);
        if (!$teacherClass) {
            return null;
        }

        return (int) ($teacherClass['class_section_id'] ?? null);
    }

    protected function administrator()
    {
        return $this->success([
            'role' => 'administrator',
            'school_year' => $this->schoolYear,
            'semester' => $this->semester,
            'enrollment_deadline' => $this->lastDayOfRegistration,
            'refund_deadline' => $this->refundDeadline,
        ], 'Administrator dashboard data');
    }

    protected function admin()
    {
        return $this->success([
            'role' => 'admin',
            'school_year' => $this->schoolYear,
            'semester' => $this->semester,
            'enrollment_deadline' => $this->lastDayOfRegistration,
            'refund_deadline' => $this->refundDeadline,
        ], 'Admin dashboard data');
    }

    protected function teacher()
    {
        return $this->success([
            'role' => 'teacher',
            'class_section_id' => $this->classSectionId,
            'school_year' => $this->schoolYear,
            'semester' => $this->semester,
            'enrollment_deadline' => $this->lastDayOfRegistration,
            'refund_deadline' => $this->refundDeadline,
        ], 'Teacher dashboard data');
    }

    protected function student()
    {
        return $this->success([
            'role' => 'student',
            'school_year' => $this->schoolYear,
            'semester' => $this->semester,
            'enrollment_deadline' => $this->lastDayOfRegistration,
            'refund_deadline' => $this->refundDeadline,
        ], 'Student dashboard data');
    }

    protected function parentDashboard()
    {
        $user = $this->getCurrentUser();
        if (!$user) {
            return $this->respondError('Authentication required', Response::HTTP_UNAUTHORIZED);
        }

        $parentId = $user->id;
        $userType = session()->get('user_type');

        // Map user type to roles
        if ($userType === 'primary') {
            $parentId = $parentId;
        } elseif ($userType === 'secondary') {
            // If user type is 'Secondary', find the parent_id from the parents table
            $parentData = DB::table('parents')
                ->select('parent_id')
                ->where('secondparent_user_id', $parentId)
                ->first();

            if ($parentData) {
                $parentId = $parentData->parent_id;
            }
        } elseif ($userType === 'tertiary') {
            // If user type is 'Tertiary', find the parent_id from the authorized_users table
            $authUserData = DB::table('authorized_users')
                ->select('user_id as parent_id')
                ->where('authorized_user_id', $parentId)
                ->first();

            if ($authUserData) {
                $parentId = $authUserData->parent_id;
            }
        }

        // If no firstparent ID is found, show an error
        if (!$parentId) {
            return $this->respondError('Unable to retrieve student data. Please contact support.', Response::HTTP_NOT_FOUND);
        }

        try {
            // Fetch Notifications (only active, non-expired, non-deleted)
            $notifications = DB::table('notifications')
                ->select([
                    'notifications.id',
                    'notifications.title',
                    'notifications.message',
                    'notifications.target_group',
                    'notifications.created_at',
                    'notifications.expires_at',
                    'user_notifications.user_id',
                    DB::raw("CASE 
                        WHEN user_notifications.user_id IS NOT NULL THEN 'personal'
                        ELSE 'broadcast'
                    END as notification_type")
                ])
                ->leftJoin('user_notifications', function ($join) use ($parentId) {
                    $join->on('user_notifications.notification_id', '=', 'notifications.id')
                        ->where('user_notifications.user_id', '=', $parentId);
                })
                ->where(function ($query) use ($parentId) {
                    $query->where('notifications.target_group', 'parent')
                        ->orWhere('user_notifications.user_id', $parentId);
                })
                ->whereNull('notifications.deleted_at')
                ->where(function ($query) {
                    $query->whereNull('notifications.expires_at')
                        ->orWhere('notifications.expires_at', '>', DB::raw('NOW()'));
                })
                ->groupBy('notifications.id', 'notifications.title', 'notifications.message', 
                         'notifications.target_group', 'notifications.created_at', 
                         'notifications.expires_at', 'user_notifications.user_id')
                ->orderBy('notifications.created_at', 'DESC')
                ->get()
                ->map(function ($item) {
                    return (array) $item;
                })
                ->toArray();

            // Fetch Student Information (no filtering needed by school year or semester)
            $students = DB::table('students')
                ->where('parent_id', $parentId)
                ->get()
                ->map(function ($student) {
                    $studentArray = (array) $student;
                    // Get class_section_name and treat it as grade
                    $classSection = $this->studentClass->getClassSectionsByStudentId($student->id, $this->schoolYear);
                    $studentArray['class_section'] = $classSection;
                    $studentArray['grade'] = $classSection; // grade same as section
                    return $studentArray;
                })
                ->toArray();

            // Fetch Attendance Records (filtered by most recent school year and semester)
            $attendanceData = DB::table('attendance_data')
                ->select('attendance_data.*', 'students.firstname', 'students.lastname')
                ->join('students', 'students.id', '=', 'attendance_data.student_id')
                ->where('students.parent_id', $parentId)
                ->where('attendance_data.school_year', $this->schoolYear)
                ->where('attendance_data.semester', $this->semester)
                ->orderBy('attendance_data.date', 'DESC')
                ->get()
                ->map(function ($item) {
                    return (array) $item;
                })
                ->toArray();

            // Fetch Grades (filtered by most recent school year and semester)
            $grades = DB::table('final_score')
                ->select('final_score.*', 'students.firstname', 'students.lastname')
                ->join('students', 'students.id', '=', 'final_score.student_id')
                ->where('students.parent_id', $parentId)
                ->where('final_score.school_year', $this->schoolYear)
                ->where('final_score.semester', $this->semester)
                ->orderBy('final_score.created_at', 'DESC')
                ->get()
                ->map(function ($item) {
                    return (array) $item;
                })
                ->toArray();

            // Fetch Enrollments (filtered by most recent school year and semester)
            $enrollments = DB::table('enrollments')
                ->select('enrollments.*', 'classes.class_name')
                ->join('students', 'students.id', '=', 'enrollments.student_id')
                ->join('classes', 'classes.id', '=', 'enrollments.class_section_id')
                ->where('students.parent_id', $parentId)
                ->where('enrollments.school_year', $this->schoolYear)
                ->where('enrollments.semester', $this->semester)
                ->orderBy('enrollments.enrollment_date', 'DESC')
                ->get()
                ->map(function ($item) {
                    return (array) $item;
                })
                ->toArray();

            // Fetch latest invoice balance
            $paymentBalance = $this->invoice->getLatestInvoiceTotalAmount($parentId);

            return $this->success([
                'role' => 'parent',
                'notifications' => $notifications,
                'students' => $students,
                'attendance' => $attendanceData,
                'grades' => $grades,
                'enrollments' => $enrollments,
                'lastDayOfRegistration' => $this->lastDayOfRegistration,
                'withdrawalDeadline' => $this->refundDeadline,
                'paymentBalance' => $paymentBalance,
                'school_year' => $this->schoolYear,
                'semester' => $this->semester,
            ], 'Parent dashboard data retrieved successfully');
        } catch (\Throwable $e) {
            log_message('error', 'Parent dashboard error: ' . $e->getMessage());
            return $this->respondError('Failed to retrieve parent dashboard data: ' . $e->getMessage(), Response::HTTP_INTERNAL_SERVER_ERROR);
        }
    }

    protected function guest()
    {
        return $this->success([
            'role' => 'guest',
            'school_year' => $this->schoolYear,
            'semester' => $this->semester,
        ], 'Guest dashboard data');
    }

    protected function getUserRole(): string
    {
        // Try to get from session first
        $role = session()->get('user_role');
        if ($role) {
            return $role;
        }

        // Try active_role
        $role = session()->get('active_role');
        if ($role) {
            return $role;
        }

        // Get from current user's roles
        $user = $this->getCurrentUser();
        if ($user && !empty($user->roles)) {
            return $user->roles[0] ?? 'guest';
        }

        // Fallback to database lookup
        $userId = $this->getCurrentUserId();
        if ($userId) {
            return $this->getUserRoleFromDatabase($userId);
        }

        return 'guest';
    }

    protected function getUserRoleFromDatabase($userId): string
    {
        try {
            $roles = $this->userRole->getRolesByUserId($userId);
            if (!empty($roles) && isset($roles[0]['role_name'])) {
                return $roles[0]['role_name'];
            }
        } catch (\Throwable $e) {
            log_message('error', 'Failed to get user role from database: ' . $e->getMessage());
        }

        return 'guest';
    }
}