<?php

namespace WappoVendor\Doctrine\DBAL\Schema;

use WappoVendor\Doctrine\DBAL\Platforms\AbstractPlatform;
use InvalidArgumentException;
use function array_filter;
use function array_keys;
use function array_map;
use function array_search;
use function array_shift;
use function count;
use function strtolower;
class Index extends AbstractAsset implements Constraint
{
    /**
     * Asset identifier instances of the column names the index is associated with.
     * array($columnName => Identifier)
     *
     * @var Identifier[]
     */
    protected $_columns = [];
    /** @var bool */
    protected $_isUnique = \false;
    /** @var bool */
    protected $_isPrimary = \false;
    /**
     * Platform specific flags for indexes.
     * array($flagName => true)
     *
     * @var true[]
     */
    protected $_flags = [];
    /**
     * Platform specific options
     *
     * @todo $_flags should eventually be refactored into options
     * @var mixed[]
     */
    private $options;
    /**
     * @param string   $name
     * @param string[] $columns
     * @param bool     $isUnique
     * @param bool     $isPrimary
     * @param string[] $flags
     * @param mixed[]  $options
     */
    public function __construct($name, array $columns, $isUnique = \false, $isPrimary = \false, array $flags = [], array $options = [])
    {
        $isUnique = $isUnique || $isPrimary;
        $this->_setName($name);
        $this->_isUnique = $isUnique;
        $this->_isPrimary = $isPrimary;
        $this->options = $options;
        foreach ($columns as $column) {
            $this->_addColumn($column);
        }
        foreach ($flags as $flag) {
            $this->addFlag($flag);
        }
    }
    /**
     * @throws InvalidArgumentException
     */
    protected function _addColumn(string $column): void
    {
        $this->_columns[$column] = new Identifier($column);
    }
    /**
     * {@inheritdoc}
     */
    public function getColumns()
    {
        return array_keys($this->_columns);
    }
    /**
     * {@inheritdoc}
     */
    public function getQuotedColumns(AbstractPlatform $platform)
    {
        $subParts = $platform->supportsColumnLengthIndexes() && $this->hasOption('lengths') ? $this->getOption('lengths') : [];
        $columns = [];
        foreach ($this->_columns as $column) {
            $length = array_shift($subParts);
            $quotedColumn = $column->getQuotedName($platform);
            if ($length !== null) {
                $quotedColumn .= '(' . $length . ')';
            }
            $columns[] = $quotedColumn;
        }
        return $columns;
    }
    /**
     * @return string[]
     */
    public function getUnquotedColumns()
    {
        return array_map([$this, 'trimQuotes'], $this->getColumns());
    }
    /**
     * Is the index neither unique nor primary key?
     *
     * @return bool
     */
    public function isSimpleIndex()
    {
        return !$this->_isPrimary && !$this->_isUnique;
    }
    /**
     * @return bool
     */
    public function isUnique()
    {
        return $this->_isUnique;
    }
    /**
     * @return bool
     */
    public function isPrimary()
    {
        return $this->_isPrimary;
    }
    /**
     * @param string $name
     * @param int    $pos
     *
     * @return bool
     */
    public function hasColumnAtPosition($name, $pos = 0)
    {
        $name = $this->trimQuotes(strtolower($name));
        $indexColumns = array_map('strtolower', $this->getUnquotedColumns());
        return array_search($name, $indexColumns, \true) === $pos;
    }
    /**
     * Checks if this index exactly spans the given column names in the correct order.
     *
     * @param string[] $columnNames
     *
     * @return bool
     */
    public function spansColumns(array $columnNames)
    {
        $columns = $this->getColumns();
        $numberOfColumns = count($columns);
        $sameColumns = \true;
        for ($i = 0; $i < $numberOfColumns; $i++) {
            if (isset($columnNames[$i]) && $this->trimQuotes(strtolower($columns[$i])) === $this->trimQuotes(strtolower($columnNames[$i]))) {
                continue;
            }
            $sameColumns = \false;
        }
        return $sameColumns;
    }
    /**
     * Checks if the other index already fulfills all the indexing and constraint needs of the current one.
     *
     * @return bool
     */
    public function isFullfilledBy(Index $other)
    {
        // allow the other index to be equally large only. It being larger is an option
        // but it creates a problem with scenarios of the kind PRIMARY KEY(foo,bar) UNIQUE(foo)
        if (count($other->getColumns()) !== count($this->getColumns())) {
            return \false;
        }
        // Check if columns are the same, and even in the same order
        $sameColumns = $this->spansColumns($other->getColumns());
        if ($sameColumns) {
            if (!$this->samePartialIndex($other)) {
                return \false;
            }
            if (!$this->hasSameColumnLengths($other)) {
                return \false;
            }
            if (!$this->isUnique() && !$this->isPrimary()) {
                // this is a special case: If the current key is neither primary or unique, any unique or
                // primary key will always have the same effect for the index and there cannot be any constraint
                // overlaps. This means a primary or unique index can always fulfill the requirements of just an
                // index that has no constraints.
                return \true;
            }
            if ($other->isPrimary() !== $this->isPrimary()) {
                return \false;
            }
            return $other->isUnique() === $this->isUnique();
        }
        return \false;
    }
    /**
     * Detects if the other index is a non-unique, non primary index that can be overwritten by this one.
     *
     * @return bool
     */
    public function overrules(Index $other)
    {
        if ($other->isPrimary()) {
            return \false;
        }
        if ($this->isSimpleIndex() && $other->isUnique()) {
            return \false;
        }
        return $this->spansColumns($other->getColumns()) && ($this->isPrimary() || $this->isUnique()) && $this->samePartialIndex($other);
    }
    /**
     * Returns platform specific flags for indexes.
     *
     * @return string[]
     */
    public function getFlags()
    {
        return array_keys($this->_flags);
    }
    /**
     * Adds Flag for an index that translates to platform specific handling.
     *
     * @param string $flag
     *
     * @return Index
     *
     * @example $index->addFlag('CLUSTERED')
     */
    public function addFlag($flag)
    {
        $this->_flags[strtolower($flag)] = \true;
        return $this;
    }
    /**
     * Does this index have a specific flag?
     *
     * @param string $flag
     *
     * @return bool
     */
    public function hasFlag($flag)
    {
        return isset($this->_flags[strtolower($flag)]);
    }
    /**
     * Removes a flag.
     *
     * @param string $flag
     *
     * @return void
     */
    public function removeFlag($flag)
    {
        unset($this->_flags[strtolower($flag)]);
    }
    /**
     * @param string $name
     *
     * @return bool
     */
    public function hasOption($name)
    {
        return isset($this->options[strtolower($name)]);
    }
    /**
     * @param string $name
     *
     * @return mixed
     */
    public function getOption($name)
    {
        return $this->options[strtolower($name)];
    }
    /**
     * @return mixed[]
     */
    public function getOptions()
    {
        return $this->options;
    }
    /**
     * Return whether the two indexes have the same partial index
     */
    private function samePartialIndex(Index $other): bool
    {
        if ($this->hasOption('where') && $other->hasOption('where') && $this->getOption('where') === $other->getOption('where')) {
            return \true;
        }
        return !$this->hasOption('where') && !$other->hasOption('where');
    }
    /**
     * Returns whether the index has the same column lengths as the other
     */
    private function hasSameColumnLengths(self $other): bool
    {
        $filter = static function (?int $length): bool {
            return $length !== null;
        };
        return array_filter($this->options['lengths'] ?? [], $filter) === array_filter($other->options['lengths'] ?? [], $filter);
    }
}
