<?php

namespace App\Http\Controllers;

use App\Helpers\DateHelper;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
use Illuminate\Foundation\Validation\ValidatesRequests;
use Illuminate\Http\Request;
use Illuminate\Routing\Controller as BaseController;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;

class Controller extends BaseController
{
    use AuthorizesRequests, ValidatesRequests;

    protected array $data = [
        'filters'   => [],
        'ranges'    => [],
        'dates'     => [],
    ];

    protected function resolvePreviousUrl(Request $request, string $sessionKey, ?string $fallback = null): ?string
    {
        $previousUrl = $request->get('previous_url');
        if (!empty($previousUrl)) {
            session([$sessionKey => $previousUrl]);
            return $previousUrl;
        }

        $previousUrl = session($sessionKey);
        if (!empty($previousUrl)) {
            return $previousUrl;
        }

        if (!empty($fallback)) {
            session([$sessionKey => $fallback]);
            return $fallback;
        }

        return null;
    }

    protected function previousUrlForRedirect(Request $request, string $sessionKey, ?string $fallback = null): ?string
    {
        $previousUrl = $request->get('previous_url');
        if (!empty($previousUrl)) {
            session([$sessionKey => $previousUrl]);
            return $previousUrl;
        }

        $previousUrl = session($sessionKey);
        if (!empty($previousUrl)) {
            return $previousUrl;
        }

        return $fallback;
    }

    /**
     * @param Model $model
     * @param string ...$columnNames
     * @return void
     */
    protected function createDateFilters(Model $model, string ...$columnNames): void
    {
        foreach ($columnNames as $columnName) {
            $this->data['dates'][$columnName] = [
                'title' => $this->data['header'][$columnName],
                'min'   => DateHelper::getDateForDB($model::query()->min($columnName) ?? ''),
                'max'   => DateHelper::getDateForDB($model::query()->max($columnName) ?? ''),
            ];
        }
    }

    /**
     * @param Model $model
     * @param array $columnNames
     * @return void
     */
    protected function createRangeFilters(Model $model, string ...$columnNames): void
    {
        foreach ($columnNames as $columnName) {
            $rangeKey = $columnName;
            if (!isset($this->data['header'][$columnName]) && isset($this->data['header'][$columnName . '_txt'])) {
                $rangeKey = $columnName . '_txt';
            }
            $title = $this->data['header'][$rangeKey] ?? $columnName;
            if(str_ends_with($columnName, '_price')) {
                $this->data['ranges'][$rangeKey] = [
                    'title' => $title,
                    'min'   => $model::query()->min($columnName) / 100,
                    'max'   => $model::query()->max($columnName) / 100,
                ];
            } else {
                $this->data['ranges'][$rangeKey] =  [
                    'title' => $title,
                    'min'   => $model::query()->min($columnName),
                    'max'   => $model::query()->max($columnName),
                ];
            }
        }
    }

    /**
     * @param Model $model
     * @param array $columns
     * @return void
     */
    protected function createFilters(Model $model, string ...$columns): void
    {
        foreach ($columns as $column) {

            $uniqueValues = $model::query()->distinct()->get($column)->pluck($column)->toArray();
            foreach ($uniqueValues as $k => $v) {
                if(!$v) {
                    $uniqueValues[$k] = '-пусто-';
                }
            }

            $result = [];
            foreach ($uniqueValues as $val){
                if(str_ends_with($column, '_id')) {
                    $relation = Str::camel(str_replace('_id', '', $column));
                    $result[$val] = $model::query()->where($column, '=', $val)->first()?->$relation->name;
                } else {
                    $result[$val] = $val;
                }
            }
            $this->data['filters'][$column] = [
                'title'     => $this->data['header'][$column],
                'values'    => $result
            ];
        }
    }


    /**
     * @param Model $model
     * @param Request $request
     * @return void
     */
    protected function setSortAndOrderBy(Model $model, Request $request): void
    {
        // ------- setup sort and order --------------------------------------------------------------------------------
        $this->data['sortBy'] = (!empty($request->sortBy))
            ? Str::replace('_txt', '', $request->sortBy) // remove '_txt' fields modifier
            : $model::DEFAULT_SORT_BY ?? 'created_at';

        // check for sortBy is valid field
        $p = new $model();
        if(!in_array($this->data['sortBy'], array_merge(['id', 'created_at'], $p->getFillable()))) {
            $this->data['sortBy'] = $model::DEFAULT_SORT_BY ?? 'created_at';
        }

        $allowedPerPage = [50, 100, 200, 500, 2000];
        $requestedPerPage = (int)$request->input('per_page', 0);
        $sessionPerPage = (int)session('per_page', 0);
        $defaultPerPage = (int)config('pagination.per_page');

        if(in_array($requestedPerPage, $allowedPerPage, true)) {
            $this->data['per_page'] = $requestedPerPage;
        } elseif(in_array($sessionPerPage, $allowedPerPage, true)) {
            $this->data['per_page'] = $sessionPerPage;
        } elseif(in_array($defaultPerPage, $allowedPerPage, true)) {
            $this->data['per_page'] = $defaultPerPage;
        } else {
            $this->data['per_page'] = 50;
        }
        session(['per_page' => $this->data['per_page']]);

        // set order
        if ($request->has('order')) {
            $this->data['orderBy'] = empty($request->order) ? 'asc' : 'desc';
        } else {
            $this->data['orderBy'] = defined($model::class . '::DEFAULT_ORDER_BY') ? $model::DEFAULT_ORDER_BY : 'asc';
        }
    }

    protected function applyStableSorting(Builder $query, string $fallbackSortBy = 'id'): void
    {
        $sortBy = $this->data['sortBy'] ?? 'created_at';
        $orderBy = $this->data['orderBy'] ?? 'asc';

        $query->orderBy($sortBy, $orderBy);
        if($sortBy !== $fallbackSortBy) {
            $query->orderBy($fallbackSortBy, $orderBy);
        }
    }

    /**
     * @param Builder $query
     * @param Request $request
     * @return void
     */
    protected function acceptFilters(Builder $query, Request $request): void
    {
        // accept filters
        if(!empty($request->filters) && is_array($request->filters)) {

            // Собираем имена range и date фильтров для пропуска _from/_to в основном цикле
            $rangeKeys = array_keys($this->data['ranges'] ?? []);
            $dateKeys = array_keys($this->data['dates'] ?? []);
            $rangeAndDateKeys = array_merge($rangeKeys, $dateKeys);

            foreach ($request->filters as $filterName => $filterValue) {
                if(!$filterValue && $filterValue !== '0') continue;

                // Пропускаем _from/_to — они обрабатываются ниже
                if(Str::endsWith($filterName, ['_from', '_to'])) {
                    continue;
                }

                // Резолвим виртуальные столбцы и значения
                [$dbColumn, $dbValue] = $this->resolveFilterColumn($filterName, $filterValue);

                if(Str::contains($dbValue, '||')) {
                    $values = explode('||', $dbValue);
                    $query->where(function ($q) use ($dbColumn, $values) {
                        $nonNullValues = [];
                        foreach ($values as $v) {
                            if ($v == '-пусто-') {
                                $q->orWhereNull($dbColumn);
                            } else {
                                $nonNullValues[] = $v;
                            }
                        }
                        if (!empty($nonNullValues)) {
                            $q->orWhereIn($dbColumn, $nonNullValues);
                        }
                    });
                } else {
                    if($dbValue == '-пусто-') {
                        $query->whereNull($dbColumn);
                    } else {
                        $query->where($dbColumn, $dbValue);
                    }
                }
            }

            // Обработка range-фильтров (_from / _to)
            foreach ($rangeAndDateKeys as $columnName) {
                $fromValue = $request->filters[$columnName . '_from'] ?? null;
                $toValue = $request->filters[$columnName . '_to'] ?? null;

                // Для price-полей значения в форме в рублях, в БД в копейках
                $dbColumn = str_ends_with($columnName, '_txt') ? substr($columnName, 0, -4) : $columnName;
                $multiplier = str_ends_with($dbColumn, '_price') ? 100 : 1;

                if($fromValue !== null && $fromValue !== '') {
                    $query->where($dbColumn, '>=', $fromValue * $multiplier);
                }
                if($toValue !== null && $toValue !== '') {
                    $query->where($dbColumn, '<=', $toValue * $multiplier);
                }
            }
        }
    }

    /**
     * Резолвит виртуальные имена столбцов и маппит отображаемые значения обратно на значения БД.
     *
     * @return array{0: string, 1: string} [реальный_столбец, значение_для_бд]
     */
    protected function resolveFilterColumn(string $filterName, string $filterValue): array
    {
        $table = $this->data['id'] ?? '';
        $columnMap = FilterController::COLUMN_MAP[$table] ?? [];
        $valueMap = FilterController::VALUE_MAP[$table] ?? [];

        // Резолвим имя столбца: явный маппинг → убираем _txt
        if (isset($columnMap[$filterName])) {
            $dbColumn = $columnMap[$filterName];
        } elseif (str_ends_with($filterName, '_txt')) {
            $dbColumn = substr($filterName, 0, -4);
        } else {
            $dbColumn = $filterName;
        }

        // Обратный маппинг значений
        if (isset($valueMap[$dbColumn])) {
            $reverseMap = array_flip($valueMap[$dbColumn]);
            $parts = explode('||', $filterValue);
            $mapped = array_map(fn($v) => (string)($reverseMap[$v] ?? $v), $parts);
            $filterValue = implode('||', $mapped);
        }

        // Для цен: значения в рублях, в БД в копейках
        if (str_ends_with($dbColumn, '_price')) {
            $parts = explode('||', $filterValue);
            $mapped = array_map(function ($v) {
                if ($v === '-пусто-') {
                    return $v;
                }
                $normalized = str_replace(',', '.', (string)$v);
                if (!is_numeric($normalized)) {
                    return $v;
                }
                return (string) round(((float)$normalized) * 100);
            }, $parts);
            $filterValue = implode('||', $mapped);
        }

        return [$dbColumn, $filterValue];
    }

    /**
     * @param Builder $query
     * @param Request $request
     * @return void
     */
    protected function acceptSearch(Builder $query, Request $request): void
    {
        // accept search
        if(!empty($request->s)) {
            $s = $request->s;
            $searchFields = $this->data['searchFields'];
            $query->where(function ($query) use ($searchFields, $s) {
                foreach ($searchFields as $searchField) {
                    if(Str::contains($searchField, '-')) {
                        list($relation, $column) = explode('-', $searchField);
                        $query->orWhereHas($relation, function ($query) use ($s, $column) {
                           $query->where($column, 'LIKE', "%{$s}%");
                        });
                    } else {
                        $query->orWhere($searchField, 'LIKE', '%' . $s . '%');
                    }
                }
            });
        }
    }

}