<?php

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class AddAssessmentNavigation extends Migration
{
    private const ITEMS = [
        'administrator/assessments' => 'Assessment Management',
        'student/assessments' => 'My Assessments',
    ];

    public function up(): void
    {
        if (! $this->db->tableExists('nav_items')) return;
        $parentColumn = $this->parentColumn();
        $studentAffairsId = null;
        if ($parentColumn !== null) {
            $parent = $this->db->table('nav_items')->select('id')->where('label', 'Student-Affairs')->where($parentColumn, null)->get()->getRowArray();
            $studentAffairsId = $parent ? (int) $parent['id'] : null;
        }
        $adminId = $this->upsertItem(self::ITEMS['administrator/assessments'], 'administrator/assessments', $studentAffairsId, 7);
        $studentId = $this->upsertItem(self::ITEMS['student/assessments'], 'student/assessments', null, 80);
        if ($this->db->tableExists('role_nav_items') && $this->db->tableExists('roles')) {
            $roles = $this->db->table('roles')->select('id, name')->get()->getResultArray();
            foreach ($roles as $role) {
                $token = strtolower(str_replace([' ', '-'], '_', trim((string) ($role['name'] ?? ''))));
                if (in_array($token, ['parent', 'student'], true)) {
                    $this->grant((int) $role['id'], $studentId);
                } elseif (! in_array($token, ['guest', 'teacher', 'teacher_assistant', 'assistant_teacher', 'ta'], true)) {
                    $this->grant((int) $role['id'], $adminId);
                }
            }
        }
        cache()->clean();
    }

    public function down(): void
    {
        if (! $this->db->tableExists('nav_items')) return;
        foreach (array_keys(self::ITEMS) as $url) {
            $row = $this->db->table('nav_items')->select('id')->where('url', $url)->get()->getRowArray();
            if ($row && $this->db->tableExists('role_nav_items')) {
                $this->db->table('role_nav_items')->where('nav_item_id', (int) $row['id'])->delete();
            }
            $this->db->table('nav_items')->where('url', $url)->delete();
        }
        cache()->clean();
    }

    private function upsertItem(string $label, string $url, ?int $parentId, int $sort): int
    {
        $existing = $this->db->table('nav_items')->select('id')->where('url', $url)->get()->getRowArray();
        $data = ['label' => $label, 'is_enabled' => 1, 'sort_order' => $sort, 'updated_at' => date('Y-m-d H:i:s')];
        $parentColumn = $this->parentColumn();
        if ($parentColumn !== null) $data[$parentColumn] = $parentId;
        if ($this->db->fieldExists('icon_class', 'nav_items')) $data['icon_class'] = 'bi bi-ui-checks-grid';
        if ($existing) {
            $this->db->table('nav_items')->where('id', (int) $existing['id'])->update($data);
            return (int) $existing['id'];
        }
        $data += ['url' => $url, 'created_at' => date('Y-m-d H:i:s')];
        $this->db->table('nav_items')->insert($data);
        return (int) $this->db->insertID();
    }

    private function grant(int $roleId, int $navItemId): void
    {
        if ($roleId <= 0 || $navItemId <= 0) return;
        $builder = $this->db->table('role_nav_items');
        if ($builder->where(['role_id' => $roleId, 'nav_item_id' => $navItemId])->countAllResults() > 0) return;
        $data = ['role_id' => $roleId, 'nav_item_id' => $navItemId];
        if ($this->db->fieldExists('created_at', 'role_nav_items')) $data['created_at'] = date('Y-m-d H:i:s');
        if ($this->db->fieldExists('updated_at', 'role_nav_items')) $data['updated_at'] = date('Y-m-d H:i:s');
        $this->db->table('role_nav_items')->insert($data);
    }

    private function parentColumn(): ?string
    {
        if ($this->db->fieldExists('menu_parent_id', 'nav_items')) return 'menu_parent_id';
        if ($this->db->fieldExists('parent_id', 'nav_items')) return 'parent_id';
        return null;
    }
}