<?php

namespace LWVendor\PhpOffice\PhpSpreadsheet\Calculation\Engine;

use LWVendor\PhpOffice\PhpSpreadsheet\Calculation\Exception;
class BranchPruner
{
    /**
     * @var bool
     */
    protected $branchPruningEnabled = \true;
    /**
     * Used to generate unique store keys.
     *
     * @var int
     */
    private $branchStoreKeyCounter = 0;
    /**
     * currently pending storeKey (last item of the storeKeysStack.
     *
     * @var ?string
     */
    protected $pendingStoreKey;
    /**
     * @var string[]
     */
    protected $storeKeysStack = [];
    /**
     * @var bool[]
     */
    protected $conditionMap = [];
    /**
     * @var bool[]
     */
    protected $thenMap = [];
    /**
     * @var bool[]
     */
    protected $elseMap = [];
    /**
     * @var int[]
     */
    protected $braceDepthMap = [];
    /**
     * @var null|string
     */
    protected $currentCondition;
    /**
     * @var null|string
     */
    protected $currentOnlyIf;
    /**
     * @var null|string
     */
    protected $currentOnlyIfNot;
    /**
     * @var null|string
     */
    protected $previousStoreKey;
    public function __construct(bool $branchPruningEnabled)
    {
        $this->branchPruningEnabled = $branchPruningEnabled;
    }
    public function clearBranchStore() : void
    {
        $this->branchStoreKeyCounter = 0;
    }
    public function initialiseForLoop() : void
    {
        $this->currentCondition = null;
        $this->currentOnlyIf = null;
        $this->currentOnlyIfNot = null;
        $this->previousStoreKey = null;
        $this->pendingStoreKey = empty($this->storeKeysStack) ? null : \end($this->storeKeysStack);
        if ($this->branchPruningEnabled) {
            $this->initialiseCondition();
            $this->initialiseThen();
            $this->initialiseElse();
        }
    }
    private function initialiseCondition() : void
    {
        if (isset($this->conditionMap[$this->pendingStoreKey]) && $this->conditionMap[$this->pendingStoreKey]) {
            $this->currentCondition = $this->pendingStoreKey;
            $stackDepth = \count($this->storeKeysStack);
            if ($stackDepth > 1) {
                // nested if
                $this->previousStoreKey = $this->storeKeysStack[$stackDepth - 2];
            }
        }
    }
    private function initialiseThen() : void
    {
        if (isset($this->thenMap[$this->pendingStoreKey]) && $this->thenMap[$this->pendingStoreKey]) {
            $this->currentOnlyIf = $this->pendingStoreKey;
        } elseif (isset($this->previousStoreKey, $this->thenMap[$this->previousStoreKey]) && $this->thenMap[$this->previousStoreKey]) {
            $this->currentOnlyIf = $this->previousStoreKey;
        }
    }
    private function initialiseElse() : void
    {
        if (isset($this->elseMap[$this->pendingStoreKey]) && $this->elseMap[$this->pendingStoreKey]) {
            $this->currentOnlyIfNot = $this->pendingStoreKey;
        } elseif (isset($this->previousStoreKey, $this->elseMap[$this->previousStoreKey]) && $this->elseMap[$this->previousStoreKey]) {
            $this->currentOnlyIfNot = $this->previousStoreKey;
        }
    }
    public function decrementDepth() : void
    {
        if (!empty($this->pendingStoreKey)) {
            --$this->braceDepthMap[$this->pendingStoreKey];
        }
    }
    public function incrementDepth() : void
    {
        if (!empty($this->pendingStoreKey)) {
            ++$this->braceDepthMap[$this->pendingStoreKey];
        }
    }
    public function functionCall(string $functionName) : void
    {
        if ($this->branchPruningEnabled && $functionName === 'IF(') {
            // we handle a new if
            $this->pendingStoreKey = $this->getUnusedBranchStoreKey();
            $this->storeKeysStack[] = $this->pendingStoreKey;
            $this->conditionMap[$this->pendingStoreKey] = \true;
            $this->braceDepthMap[$this->pendingStoreKey] = 0;
        } elseif (!empty($this->pendingStoreKey) && \array_key_exists($this->pendingStoreKey, $this->braceDepthMap)) {
            // this is not an if but we go deeper
            ++$this->braceDepthMap[$this->pendingStoreKey];
        }
    }
    public function argumentSeparator() : void
    {
        if (!empty($this->pendingStoreKey) && $this->braceDepthMap[$this->pendingStoreKey] === 0) {
            // We must go to the IF next argument
            if ($this->conditionMap[$this->pendingStoreKey]) {
                $this->conditionMap[$this->pendingStoreKey] = \false;
                $this->thenMap[$this->pendingStoreKey] = \true;
            } elseif ($this->thenMap[$this->pendingStoreKey]) {
                $this->thenMap[$this->pendingStoreKey] = \false;
                $this->elseMap[$this->pendingStoreKey] = \true;
            } elseif ($this->elseMap[$this->pendingStoreKey]) {
                throw new Exception('Reaching fourth argument of an IF');
            }
        }
    }
    /**
     * @param mixed $value
     */
    public function closingBrace($value) : void
    {
        if (!empty($this->pendingStoreKey) && $this->braceDepthMap[$this->pendingStoreKey] === -1) {
            // we are closing an IF(
            if ($value !== 'IF(') {
                throw new Exception('Parser bug we should be in an "IF("');
            }
            if ($this->conditionMap[$this->pendingStoreKey]) {
                throw new Exception('We should not be expecting a condition');
            }
            $this->thenMap[$this->pendingStoreKey] = \false;
            $this->elseMap[$this->pendingStoreKey] = \false;
            --$this->braceDepthMap[$this->pendingStoreKey];
            \array_pop($this->storeKeysStack);
            $this->pendingStoreKey = null;
        }
    }
    public function currentCondition() : ?string
    {
        return $this->currentCondition;
    }
    public function currentOnlyIf() : ?string
    {
        return $this->currentOnlyIf;
    }
    public function currentOnlyIfNot() : ?string
    {
        return $this->currentOnlyIfNot;
    }
    private function getUnusedBranchStoreKey() : string
    {
        $storeKeyValue = 'storeKey-' . $this->branchStoreKeyCounter;
        ++$this->branchStoreKeyCounter;
        return $storeKeyValue;
    }
}