<?php

namespace App\Services;

use App\StaffNotification;
use App\User;

class NotificationService
{
    const TYPE_PEMBIAYAAN_PENDING_PC = 'pembiayaan_online.pending_pc';
    const TYPE_MODAL_PENDING_OPERASI = 'modal_online.pending_operasi';
    const TYPE_PEMBIAYAAN_BATCH_OPERASI = 'pembiayaan_online.batch_operasi';
    const TYPE_PEMBIAYAAN_REJECTED_PC = 'pembiayaan_online.rejected_pc';
    const TYPE_PEMBIAYAAN_PAID_PC = 'pembiayaan_online.paid_pc';

    /**
     * Create one inbox row per staff matching role + branch.
     *
     * @param  string  $role
     * @param  string  $kodcaw
     * @param  array  $payload
     * @return \Illuminate\Support\Collection
     */
    public function notifyRoleAtCawangan($role, $kodcaw, array $payload)
    {
        $users = User::query()
            ->where('roles', $role)
            ->where('cawangan', $kodcaw)
            ->get();

        $created = collect();
        foreach ($users as $user) {
            $created->push($this->notifyUser($user, $kodcaw, $role, $payload));
        }

        return $created;
    }

    /**
     * Create one inbox row per staff matching role (any branch). For HQ like operasi.
     *
     * @param  string  $role
     * @param  array  $payload
     * @return \Illuminate\Support\Collection
     */
    public function notifyRole($role, array $payload)
    {
        $kodcaw = isset($payload['cawangan']) ? $payload['cawangan'] : null;
        $users = User::query()->where('roles', $role)->get();

        $created = collect();
        foreach ($users as $user) {
            $created->push($this->notifyUser($user, $kodcaw, $role, $payload));
        }

        return $created;
    }

    /**
     * Entry point for api_arrahn (and local callers). Builds title/url from type when omitted.
     *
     * @param  array  $input
     * @return \Illuminate\Support\Collection
     */
    public function dispatch(array $input)
    {
        $type = isset($input['type']) ? $input['type'] : '';
        $kodcaw = isset($input['cawangan']) ? $input['cawangan'] : null;
        $audience = isset($input['audience']) && is_array($input['audience']) ? $input['audience'] : [];
        $role = isset($audience['role']) ? $audience['role'] : null;
        $data = isset($input['data']) && is_array($input['data']) ? $input['data'] : [];

        $payload = $this->payloadForType($type, $kodcaw, $data);

        if (!empty($input['title'])) {
            $payload['title'] = $input['title'];
        }
        if (array_key_exists('body', $input) && $input['body'] !== null && $input['body'] !== '') {
            $payload['body'] = $input['body'];
        }
        if (!empty($input['url'])) {
            $payload['url'] = $input['url'];
        }

        if ($role === 'operasi') {
            return $this->notifyRole('operasi', $payload);
        }

        if ($role && $kodcaw) {
            return $this->notifyRoleAtCawangan($role, $kodcaw, $payload);
        }

        return collect();
    }

    /**
     * @param  string  $type
     * @param  string|null  $kodcaw
     * @param  array  $data
     * @return array
     */
    protected function payloadForType($type, $kodcaw, array $data)
    {
        if ($type === self::TYPE_MODAL_PENDING_OPERASI) {
            $jenis = isset($data['jenis']) ? strtoupper((string) $data['jenis']) : 'HAD';
            $label = $jenis === 'TOPUP' ? 'tambah modal' : 'had modal';
            $nama = !empty($data['cawangan_nama']) ? $data['cawangan_nama'] : $kodcaw;
            $amaun = number_format(isset($data['amaun']) ? (float) $data['amaun'] : 0, 2);
            $oleh = isset($data['dimohon_oleh']) ? trim((string) $data['dimohon_oleh']) : '';

            return [
                'type' => $type,
                'cawangan' => $kodcaw,
                'title' => 'Permohonan modal online',
                'body' => sprintf(
                    '%s mohon %s RM %s%s',
                    $nama,
                    $label,
                    $amaun,
                    $oleh !== '' ? ' — '.$oleh : ''
                ),
                'url' => '/pembiayaan-online/operasi/topup',
                'data' => $data,
            ];
        }

        if ($type === self::TYPE_PEMBIAYAAN_BATCH_OPERASI) {
            $nama = !empty($data['cawangan_nama']) ? $data['cawangan_nama'] : $kodcaw;
            $batchNo = !empty($data['batch_no']) ? $data['batch_no'] : 'batch';
            $batchId = isset($data['batch_id']) ? $data['batch_id'] : null;
            $submitted = isset($data['submitted_count']) ? (int) $data['submitted_count'] : 0;
            $jumlah = number_format(isset($data['jumlah_keseluruhan']) ? (float) $data['jumlah_keseluruhan'] : 0, 2);
            $oleh = isset($data['pc_submitted_by']) ? trim((string) $data['pc_submitted_by']) : '';
            $appended = !empty($data['appended']);

            if ($appended) {
                $body = sprintf(
                    '%s tambah %d rekod ke %s (RM %s)%s',
                    $nama,
                    $submitted,
                    $batchNo,
                    $jumlah,
                    $oleh !== '' ? ' — '.$oleh : ''
                );
            } else {
                $body = sprintf(
                    '%s hantar %s — %d rekod (RM %s)%s',
                    $nama,
                    $batchNo,
                    $submitted,
                    $jumlah,
                    $oleh !== '' ? ' — '.$oleh : ''
                );
            }

            return [
                'type' => $type,
                'cawangan' => $kodcaw,
                'title' => 'Batch pembiayaan online',
                'body' => $body,
                'url' => ($kodcaw && $batchId)
                    ? '/pembiayaan-online/operasi/'.$kodcaw.'/batches/'.$batchId
                    : '/pembiayaan-online/operasi',
                'data' => $data,
            ];
        }

        if ($type === self::TYPE_PEMBIAYAAN_REJECTED_PC) {
            $norujukan = !empty($data['norujukan']) ? $data['norujukan'] : 'rekod';
            $reason = isset($data['reject_reason']) ? trim((string) $data['reject_reason']) : '';
            $amaun = number_format(isset($data['pinjaman']) ? (float) $data['pinjaman'] : 0, 2);

            return [
                'type' => $type,
                'cawangan' => $kodcaw,
                'title' => 'Pembiayaan online ditolak',
                'body' => sprintf(
                    '%s (RM %s) ditolak%s',
                    $norujukan,
                    $amaun,
                    $reason !== '' ? ' — '.$reason : ''
                ),
                'url' => '/pembiayaan-online/pc',
                'data' => $data,
            ];
        }

        if ($type === self::TYPE_PEMBIAYAAN_PAID_PC) {
            $paidCount = isset($data['paid_count']) ? (int) $data['paid_count'] : 1;
            $batchNo = !empty($data['batch_no']) ? $data['batch_no'] : '';
            $norujukan = !empty($data['norujukan']) ? $data['norujukan'] : '';
            $nama = isset($data['nama_pelanggan']) ? trim((string) $data['nama_pelanggan']) : '';
            $amaun = number_format(
                isset($data['pinjaman'])
                    ? (float) $data['pinjaman']
                    : (isset($data['jumlah_keseluruhan']) ? (float) $data['jumlah_keseluruhan'] : 0),
                2
            );

            if ($paidCount > 1 || ($batchNo !== '' && $norujukan === '')) {
                $body = sprintf(
                    '%d rekod telah dibayar%s (RM %s)',
                    $paidCount > 0 ? $paidCount : 0,
                    $batchNo !== '' ? ' dalam '.$batchNo : '',
                    $amaun
                );
            } else {
                $body = sprintf(
                    '%s telah dibayar (RM %s)%s',
                    $norujukan !== '' ? $norujukan : 'Rekod',
                    $amaun,
                    $nama !== '' ? ' — '.$nama : ''
                );
            }

            return [
                'type' => $type,
                'cawangan' => $kodcaw,
                'title' => 'Pembiayaan online telah dibayar',
                'body' => $body,
                'url' => '/pembiayaan-online/pc/paid',
                'data' => $data,
            ];
        }

        return [
            'type' => $type,
            'cawangan' => $kodcaw,
            'title' => isset($data['title']) ? $data['title'] : $type,
            'body' => isset($data['body']) ? $data['body'] : null,
            'url' => isset($data['url']) ? $data['url'] : null,
            'data' => $data,
        ];
    }

    /**
     * Create one inbox row for a specific user.
     *
     * @param  \App\User  $user
     * @param  string|null  $kodcaw
     * @param  string|null  $role
     * @param  array  $payload
     * @return \App\StaffNotification
     */
    public function notifyUser(User $user, $kodcaw, $role, array $payload)
    {
        return StaffNotification::create([
            'user_id' => $user->id,
            'cawangan' => $kodcaw,
            'role' => $role ?: $user->roles,
            'type' => $payload['type'],
            'title' => $payload['title'],
            'body' => isset($payload['body']) ? $payload['body'] : null,
            'url' => isset($payload['url']) ? $payload['url'] : null,
            'data' => isset($payload['data']) ? $payload['data'] : null,
        ]);
    }

    /**
     * @param  \App\User  $user
     * @param  int  $limit
     * @return \Illuminate\Support\Collection
     */
    public function inboxFor(User $user, $limit = 20)
    {
        return StaffNotification::query()
            ->where('user_id', $user->id)
            ->orderByDesc('id')
            ->limit($limit)
            ->get();
    }

    /**
     * @param  \App\User  $user
     * @return int
     */
    public function unreadCount(User $user)
    {
        return StaffNotification::query()
            ->where('user_id', $user->id)
            ->unread()
            ->count();
    }

    /**
     * @param  \App\User  $user
     * @param  int  $id
     * @return \App\StaffNotification|null
     */
    public function markAsRead(User $user, $id)
    {
        $notification = StaffNotification::query()
            ->where('user_id', $user->id)
            ->where('id', $id)
            ->first();

        if (!$notification) {
            return null;
        }

        if ($notification->read_at === null) {
            $notification->read_at = now();
            $notification->save();
        }

        return $notification;
    }

    /**
     * @param  \App\User  $user
     * @return int
     */
    public function markAllAsRead(User $user)
    {
        return StaffNotification::query()
            ->where('user_id', $user->id)
            ->unread()
            ->update(['read_at' => now()]);
    }

    /**
     * @param  \App\User  $user
     * @param  int  $limit
     * @return array
     */
    public function inboxPayload(User $user, $limit = 20)
    {
        return [
            'unread_count' => $this->unreadCount($user),
            'notifications' => $this->inboxFor($user, $limit)->map(function (StaffNotification $notification) {
                return $notification->toInboxArray();
            })->values(),
        ];
    }
}