<?php

// app/Repositories/SttMedicalHistoryRepository.php
namespace App\Repositories;

use App\Models\SI\SttMedicalHistory as SiMedicalHistory;
use App\Models\Mis\SttMedicalHistory as MisMedicalHistory;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;

class MedicalHistoryRepository
{
    protected SiMedicalHistory $siModel;
    protected MisMedicalHistory $misModel;

    // Поля по умолчанию
    protected array $defaultFieldsSI = [
        'id',
        'family',
        'name',
        'ot',
        'daterecipient',
        'dateextract',
        'medcardnum',
        'dr'
    ];

    protected array $defaultFieldsMis = [
        'MedicalHistoryID',
        'FAMILY',
        'Name',
        'OT',
        'DateRecipient',
        'DateExtract',
        'MedCardNum',
        'BD'
    ];

    public function __construct(
        SiMedicalHistory $siModel,
        MisMedicalHistory $misModel
    ) {
        $this->siModel = $siModel;
        $this->misModel = $misModel;
    }

    /**
     * ПОИСК ТОЛЬКО В POSTGRESQL (основной)
     */
    public function searchInPostgres(
        ?string $searchText,
        ?string $dateFrom,
        ?string $dateTo,
        ?int $status,
        int $pageSize = 15,
        string $sortBy = 'dateextract',
        string $sortDir = 'desc',
    ): LengthAwarePaginator {

        $query = $this->siModel->newQuery();

        $this->applyStatusFilter($query, $status);
        $this->applyDateFilter($query, 'dateextract', $dateFrom, $dateTo);
        $this->applySearchConditions($query, $searchText);

        return $query->select($this->defaultFieldsSI)
            ->orderBy($sortBy, $sortDir)
            ->with(['archiveInfo'])
            ->paginate($pageSize)
            ->through(function ($item) {
                $item->database_source = 'postgresql';
                return $item;
            });
    }

    /**
     * ПОИСК ТОЛЬКО В MSSQL (исторический)
     */
    public function searchInMssql(
        ?string $searchText,
        ?string $dateFrom,
        ?string $dateTo,
        ?int $status,
        int $pageSize = 15,
        string $sortBy = 'DateExtract',
        string $sortDir = 'desc'
    ): LengthAwarePaginator {

        $query = $this->misModel->newQuery();

        $this->applyStatusFilter($query, $status);
        $this->applyDateFilter($query, 'DateExtract', $dateFrom, $dateTo);
        $this->applySearchConditions($query, $searchText, 'mssql');

        return $query->select($this->defaultFieldsMis)
            ->orderBy($sortBy, $sortDir)
            ->with(['archiveInfo'])
            ->paginate($pageSize)
            ->through(function ($item) {
                $item->database_source = 'mssql';
                return $item;
            });
    }

    /**
     * УМНЫЙ ПОИСК (сначала PostgreSQL, потом MSSQL если мало)
     */
    public function smartSearch(
        ?string $searchText,
        ?string $dateFrom,
        ?string $dateTo,
        int $pageSize = 15
    ): LengthAwarePaginator {

        // 1. Ищем в PostgreSQL
        $pgPaginator = $this->searchInPostgres($searchText, $dateFrom, $dateTo, $pageSize);

        // 2. Если мало результатов, добавляем из MSSQL
        if ($pgPaginator->total() < $pageSize && $pgPaginator->total() < 10) {
            $needed = $pageSize - $pgPaginator->count();

            $mssqlResults = $this->searchInMssql($searchText, $dateFrom, $dateTo, $needed)
                ->getCollection();

            $allResults = $pgPaginator->getCollection()
                ->merge($mssqlResults)
                ->sortByDesc('dateextract')
                ->values();

            return new LengthAwarePaginator(
                $allResults,
                $pgPaginator->total() + $mssqlResults->count(),
                $pageSize,
                request()->get('page', 1)
            );
        }

        return $pgPaginator;
    }

    /**
     * РАЗДЕЛЬНЫЙ ПОИСК (отдельные результаты по БД)
     */
    public function separateSearch(
        ?string $searchText,
        ?string $dateFrom,
        ?string $dateTo,
        ?int $status,
        int $perPage = 15,
    ): array {
        $pgPaginator = $this->searchInPostgres($searchText, $dateFrom, $dateTo, $status, $perPage);
        $mssqlPaginator = $this->searchInMssql($searchText, $dateFrom, $dateTo, $status, $perPage);

        return [
            'si' => $pgPaginator,
            'mis' => $mssqlPaginator,
            'stats' => [
                'si_total' => $pgPaginator->total(),
                'mis_total' => $mssqlPaginator->total(),
                'combined_total' => $pgPaginator->total() + $mssqlPaginator->total(),
            ]
        ];
    }

    /**
     * ПРИМЕНЕНИЕ УСЛОВИЙ ПОИСКА
     */
    private function applySearchConditions($query, ?string $searchText, string $dbType = 'postgresql'): void
    {
        // Разбиваем поисковую строку на слова
        $words = preg_split('/\s+/', trim($searchText));
        $words = array_filter($words);

        if (empty($words)) {
            return;
        }

        $query->where(function($q) use ($words, $dbType) {
            // Если одно слово - ищем в любом поле
            if (count($words) === 1) {
                $word = Str::ucfirst($words[0]);
                $pattern = $word . '%'; // Префиксный поиск для использования индекса

                if ($dbType === 'postgresql') {
                    $q->where('family', 'LIKE', $pattern)
                        ->orWhere('name', 'LIKE', $pattern)
                        ->orWhere('ot', 'LIKE', $pattern);
                } else {
                    $q->where('FAMILY', 'LIKE', $pattern)
                        ->orWhere('Name', 'LIKE', $pattern)
                        ->orWhere('OT', 'LIKE', $pattern);
                }
            }
            // Если несколько слов - предполагаем Ф+И+О
            else {
                // Берем первые 3 слова
                $family = !empty($words[0]) ? Str::ucfirst($words[0]) : null;
                $name = !empty($words[1]) ? Str::ucfirst($words[1]) : null;
                $ot = !empty($words[2]) ? Str::ucfirst($words[2]) : null;

                if ($dbType === 'postgresql') {
                    $q->where('family', 'LIKE', $family . '%');
                } else {
                    $q->where('FAMILY', 'LIKE', $family . '%');
                }

                if ($name) {
                    if ($dbType === 'postgresql') {
                        $q->where('name', 'LIKE', $name . '%');
                    } else {
                        $q->where('Name', 'LIKE', $name . '%');
                    }
                }

                if ($ot) {
                    if ($dbType === 'postgresql') {
                        $q->where('ot', 'LIKE', $ot . '%');
                    } else {
                        $q->where('OT', 'LIKE', $ot . '%');
                    }
                }
            }
        });
    }

    private function applyStatusFilter(Builder $query, ?int $value)
    {
        if ($value === 0) {
            $query->doesntHave('archiveInfo');
        } else {
            if ($query->withExists('archiveInfo') && !empty($value)) {
                $query->withWhereHas('archiveInfo', function ($q) use ($value) {
                    $q->where('status_id', '=', $value);
                });
            }
        }
    }

    /**
     * ФИЛЬТР ПО ДАТЕ
     */
    private function applyDateFilter($query, string $dateField, ?string $dateFrom, ?string $dateTo): void
    {
        if (!empty($dateFrom)) {
            $query->whereDate($dateField, '>=', $dateFrom);
        }

        if (!empty($dateTo)) {
            $query->whereDate($dateField, '<=', $dateTo);
        }
    }

    /**
     * ПОЛУЧИТЬ СТАТИСТИКУ ПО БАЗАМ
     */
    public function getDatabaseStats(): array
    {
        return [
            'postgresql' => [
                'total' => $this->siModel->count(),
                'connection' => config('database.connections.pgsql.database'),
                'status' => 'primary',
            ],
            'mssql' => [
                'total' => $this->misModel->count(),
                'connection' => config('database.connections.sqlsrv.database'),
                'status' => 'secondary',
            ]
        ];
    }

    /**
     * БЫСТРЫЙ ПОИСК ПО ТИПУ
     */
    public function quickSearch(string $type, string $value): Collection
    {
        return match($type) {
            'medcard' => $this->searchByMedCard($value),
            'enp' => $this->searchByEnp($value),
            'fullname' => $this->searchByFullName($value),
            default => collect(),
        };
    }

    private function searchByMedCard(string $medCard): Collection
    {
        $pgResults = $this->siModel->where('medcardnum', 'LIKE', "%{$medCard}%")
            ->limit(10)
            ->get()
            ->each(fn($item) => $item->database_source = 'postgresql');

        $mssqlResults = $this->misModel->where('medcardnum', 'LIKE', "%{$medCard}%")
            ->limit(10)
            ->get()
            ->each(fn($item) => $item->database_source = 'mssql');

        return $pgResults->concat($mssqlResults)
            ->sortBy('medcardnum')
            ->values();
    }

    private function searchByFullName(string $name): Collection
    {
        $pattern = "%{$name}%";

        $pgResults = $this->siModel->where('family', 'ILIKE', $pattern)
            ->orWhere('name', 'ILIKE', $pattern)
            ->orWhere('ot', 'ILIKE', $pattern)
            ->limit(10)
            ->get()
            ->each(fn($item) => $item->database_source = 'postgresql');

        $mssqlResults = $this->misModel->where('family', 'LIKE', $pattern)
            ->orWhere('name', 'LIKE', $pattern)
            ->orWhere('ot', 'LIKE', $pattern)
            ->limit(10)
            ->get()
            ->each(fn($item) => $item->database_source = 'mssql');

        return $pgResults->concat($mssqlResults)
            ->sortBy('family')
            ->values();
    }
}