<?php

namespace Filament\Tables\Concerns;

use Filament\Forms\Form;
use Filament\Tables\Filters\BaseFilter;
use Filament\Tables\Filters\QueryBuilder;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Support\Arr;

/**
 * @property Form $tableFiltersForm
 */
trait HasFilters
{
    /**
     * @var array<string, mixed> | null
     */
    public ?array $tableFilters = null;

    /**
     * @var array<string, mixed> | null
     */
    public ?array $tableDeferredFilters = null;

    public function getTableFiltersForm(): Form
    {
        if ((! $this->isCachingForms) && $this->hasCachedForm('tableFiltersForm')) {
            return $this->getForm('tableFiltersForm');
        }

        return $this->makeForm()
            ->schema($this->getTable()->getFiltersFormSchema())
            ->columns($this->getTable()->getFiltersFormColumns())
            ->model($this->getTable()->getModel())
            ->statePath($this->getTable()->hasDeferredFilters() ? 'tableDeferredFilters' : 'tableFilters')
            ->when(! $this->getTable()->hasDeferredFilters(), fn (Form $form) => $form->live());
    }

    public function updatedTableFilters(): void
    {
        if ($this->getTable()->hasDeferredFilters()) {
            $this->tableDeferredFilters = $this->tableFilters;
        }

        $this->handleTableFilterUpdates();
    }

    protected function handleTableFilterUpdates(): void
    {
        if ($this->getTable()->persistsFiltersInSession()) {
            session()->put(
                $this->getTableFiltersSessionKey(),
                $this->tableFilters,
            );
        }

        if ($this->getTable()->shouldDeselectAllRecordsWhenFiltered()) {
            $this->deselectAllTableRecords();
        }

        $this->resetPage();
    }

    public function removeTableFilter(string $filterName, ?string $field = null, bool $isRemovingAllFilters = false): void
    {
        $filter = $this->getTable()->getFilter($filterName);
        $filterResetState = $filter->getResetState();

        $filterFormGroup = $this->getTableFiltersForm()->getComponent($filterName);

        if (($filter instanceof QueryBuilder) && blank($field)) {
            $filterFormGroup->getChildComponentContainer()->fill();
        } else {
            $filterFields = $filterFormGroup?->getChildComponentContainer()->getFlatFields();

            if (filled($field) && array_key_exists($field, $filterFields)) {
                $filterFields = [$field => $filterFields[$field]];
            }

            foreach ($filterFields as $fieldName => $field) {
                $state = $field->getState();

                $field->state($filterResetState[$fieldName] ?? match (true) {
                    is_array($state) => [],
                    is_bool($state) => false,
                    default => null,
                });
            }
        }

        if ($isRemovingAllFilters) {
            return;
        }

        if ($this->getTable()->hasDeferredFilters()) {
            $this->applyTableFilters();

            return;
        }

        $this->handleTableFilterUpdates();
    }

    public function removeTableFilters(): void
    {
        $filters = $this->getTable()->getFilters();

        foreach ($filters as $filterName => $filter) {
            $this->removeTableFilter(
                $filterName,
                isRemovingAllFilters: true,
            );
        }

        $this->resetTableSearch();
        $this->resetTableColumnSearches();

        if ($this->getTable()->hasDeferredFilters()) {
            $this->applyTableFilters();

            return;
        }

        $this->handleTableFilterUpdates();
    }

    public function resetTableFiltersForm(): void
    {
        $this->getTableFiltersForm()->fill();

        if ($this->getTable()->hasDeferredFilters()) {
            $this->applyTableFilters();

            return;
        }

        $this->handleTableFilterUpdates();
    }

    public function applyTableFilters(): void
    {
        $this->tableFilters = $this->tableDeferredFilters;

        $this->handleTableFilterUpdates();
    }

    protected function applyFiltersToTableQuery(Builder $query): Builder
    {
        foreach ($this->getTable()->getFilters() as $filter) {
            $filter->applyToBaseQuery(
                $query,
                $this->getTableFilterState($filter->getName()) ?? [],
            );
        }

        return $query->where(function (Builder $query) {
            foreach ($this->getTable()->getFilters() as $filter) {
                $filter->apply(
                    $query,
                    $this->getTableFilterState($filter->getName()) ?? [],
                );
            }
        });
    }

    public function getTableFilterState(string $name): ?array
    {
        return Arr::get($this->tableFilters, $this->parseTableFilterName($name));
    }

    public function parseTableFilterName(string $name): string
    {
        if (! class_exists($name)) {
            return $name;
        }

        if (! is_subclass_of($name, BaseFilter::class)) {
            return $name;
        }

        return $name::getDefaultName();
    }

    public function getTableFiltersSessionKey(): string
    {
        $table = md5($this::class);

        return "tables.{$table}_filters";
    }

    /**
     * @deprecated Override the `table()` method to configure the table.
     *
     * @return array<BaseFilter>
     */
    protected function getTableFilters(): array
    {
        return [];
    }

    /**
     * @deprecated Override the `table()` method to configure the table.
     */
    protected function getTableFiltersFormWidth(): ?string
    {
        return null;
    }

    /**
     * @deprecated Override the `table()` method to configure the table.
     */
    protected function getTableFiltersFormMaxHeight(): ?string
    {
        return null;
    }

    /**
     * @deprecated Override the `table()` method to configure the table.
     */
    protected function shouldPersistTableFiltersInSession(): bool
    {
        return false;
    }
}