<?php

namespace Modules\Crm\Utils;

use App\User;
use Carbon\Carbon;
use Carbon\CarbonInterval;
use Modules\Crm\Entities\CrmCallLog;
use Modules\Crm\Entities\CrmPhoneFollowUp;
use Modules\Crm\Entities\CrmPhoneFollowUpLog;

class PhoneListUtil
{
    public static function normalizeNationalNumber(?string $number): string
    {
        if (empty($number)) {
            return '';
        }

        $number = trim($number);
        $first_character = substr($number, 0, 1);

        if ($first_character === '0') {
            return ltrim($number, '0');
        }

        if ($first_character === '+') {
            try {
                $phoneUtil = \libphonenumber\PhoneNumberUtil::getInstance();
                $number_obj = $phoneUtil->parse($number);

                return (string) $number_obj->getNationalNumber();
            } catch (\Exception $e) {
                return preg_replace('/\D+/', '', $number);
            }
        }

        return preg_replace('/\D+/', '', $number);
    }

    public function numbersMatch(?string $a, ?string $b): bool
    {
        $na = self::normalizeNationalNumber($a);
        $nb = self::normalizeNationalNumber($b);

        return ! empty($na) && $na === $nb;
    }

    public function findActiveByNumber(int $business_id, string $number): ?CrmPhoneFollowUp
    {
        $phones = CrmPhoneFollowUp::where('business_id', $business_id)
            ->where('status', '!=', 'converted')
            ->get();

        foreach ($phones as $phone) {
            if ($this->numbersMatch($phone->mobile_number, $number)) {
                return $phone;
            }
        }

        return null;
    }

    public function createFromImportRow(int $business_id, int $user_id, array $row): array
    {
        $mobile = trim($row['mobile_number'] ?? '');
        if (empty($mobile)) {
            return ['status' => 'invalid', 'msg' => __('crm::lang.phone_number_required')];
        }

        $exists = CrmPhoneFollowUp::where('business_id', $business_id)
            ->where('mobile_number', $mobile)
            ->where('status', '!=', 'converted')
            ->exists();

        if ($exists) {
            return ['status' => 'skipped'];
        }

        $assigned_to = null;
        if (! empty($row['assigned_to'])) {
            $assigned_to = $this->resolveAssignedUserId($business_id, $row['assigned_to']);
        }

        CrmPhoneFollowUp::create([
            'business_id' => $business_id,
            'mobile_number' => $mobile,
            'contact_name' => $row['contact_name'] ?? null,
            'company_name' => $row['company_name'] ?? null,
            'city' => $row['city'] ?? null,
            'province' => $row['province'] ?? null,
            'source' => $row['source'] ?? null,
            'priority' => ! empty($row['priority']) ? (int) $row['priority'] : 3,
            'notes' => $row['notes'] ?? null,
            'status' => 'pending',
            'assigned_to' => $assigned_to,
            'created_by' => $user_id,
        ]);

        return ['status' => 'created'];
    }

    public function resolveAssignedUserId(int $business_id, string $value): ?int
    {
        $value = trim($value);
        if (empty($value)) {
            return null;
        }

        if (is_numeric($value)) {
            $user = User::where('business_id', $business_id)->find((int) $value);

            return $user?->id;
        }

        $user = User::where('business_id', $business_id)
            ->where(function ($q) use ($value) {
                $q->where('username', $value)
                    ->orWhere('email', $value)
                    ->orWhereRaw("CONCAT(COALESCE(first_name, ''), ' ', COALESCE(last_name, '')) like ?", ["%{$value}%"]);
            })
            ->first();

        return $user?->id;
    }

    public function syncFromCallLog(array $callLogData, ?int $call_log_id = null): void
    {
        if (empty($callLogData['business_id']) || empty($callLogData['mobile_number'])) {
            return;
        }

        $phone = $this->findActiveByNumber($callLogData['business_id'], $callLogData['mobile_number']);
        if (empty($phone)) {
            return;
        }

        $duration = ! empty($callLogData['duration']) ? (int) $callLogData['duration'] : 0;
        $call_type = $callLogData['call_type'] ?? 'call';
        $duration_text = $duration > 0
            ? CarbonInterval::seconds($duration)->cascade()->forHumans()
            : '-';
        $note = __('crm::lang.auto_synced_from_call_log', [
            'type' => $call_type,
            'duration' => $duration_text,
        ]);

        CrmPhoneFollowUpLog::create([
            'phone_follow_up_id' => $phone->id,
            'status' => 'contacted',
            'note' => $note,
            'created_by' => $callLogData['created_by'],
            'call_log_id' => $call_log_id,
            'is_auto' => true,
        ]);

        $phone->update([
            'status' => $phone->status === 'pending' ? 'contacted' : $phone->status,
            'last_follow_up_at' => $callLogData['start_time'] ?? now(),
            'follow_up_count' => $phone->follow_up_count + 1,
        ]);
    }

    public function getCallLogCount(int $business_id, string $mobile_number): int
    {
        if (! config('constants.enable_crm_call_log')) {
            return 0;
        }

        $normalized = self::normalizeNationalNumber($mobile_number);
        if (empty($normalized)) {
            return 0;
        }

        return CrmCallLog::where('business_id', $business_id)
            ->where(function ($q) use ($normalized, $mobile_number) {
                $q->where('mobile_number', $mobile_number)
                    ->orWhere('mobile_number', 'like', "%{$normalized}");
            })
            ->count();
    }

    public function getCallLogsForPhone(CrmPhoneFollowUp $phone)
    {
        if (! config('constants.enable_crm_call_log')) {
            return collect();
        }

        $logs = CrmCallLog::where('business_id', $phone->business_id)
            ->latest('start_time')
            ->limit(100)
            ->get();

        return $logs->filter(function ($log) use ($phone) {
            return $this->numbersMatch($log->mobile_number, $phone->mobile_number);
        })->values();
    }

    public function getReminderSettings(int $business_id): array
    {
        $crmUtil = new CrmUtil();
        $settings = $crmUtil->getCrmSettings($business_id);

        return [
            'enabled' => ! empty($settings['enable_phone_list_reminder']),
            'days' => max(1, (int) ($settings['phone_list_reminder_days'] ?? 1)),
        ];
    }
}