<?php

namespace PhpZip\Model;

use PhpZip\Exception\InvalidArgumentException;
use PhpZip\Exception\ZipEntryNotFoundException;
use PhpZip\Exception\ZipException;
use PhpZip\Model\Entry\ZipChangesEntry;
use PhpZip\Model\Entry\ZipSourceEntry;
use PhpZip\ZipFile;

/**
 * Zip Model.
 *
 * @author Ne-Lexa alexey@nelexa.ru
 * @license MIT
 */
class ZipModel implements \Countable
{
    /** @var ZipSourceEntry[] */
    protected $inputEntries = [];

    /** @var ZipEntry[] */
    protected $outEntries = [];

    /** @var string|null */
    protected $archiveComment;

    /** @var string|null */
    protected $archiveCommentChanges;

    /** @var bool */
    protected $archiveCommentChanged = false;

    /** @var int|null */
    protected $zipAlign;

    /** @var bool */
    private $zip64;

    /**
     * @param ZipSourceEntry[]      $entries
     * @param EndOfCentralDirectory $endOfCentralDirectory
     *
     * @return ZipModel
     */
    public static function newSourceModel(array $entries, EndOfCentralDirectory $endOfCentralDirectory)
    {
        $model = new self();
        $model->inputEntries = $entries;
        $model->outEntries = $entries;
        $model->archiveComment = $endOfCentralDirectory->getComment();
        $model->zip64 = $endOfCentralDirectory->isZip64();

        return $model;
    }

    /**
     * @return string|null
     */
    public function getArchiveComment()
    {
        if ($this->archiveCommentChanged) {
            return $this->archiveCommentChanges;
        }

        return $this->archiveComment;
    }

    /**
     * @param string $comment
     */
    public function setArchiveComment($comment)
    {
        if ($comment !== null && $comment !== '') {
            $comment = (string) $comment;
            $length = \strlen($comment);

            if ($length > 0xffff) {
                throw new InvalidArgumentException('Length comment out of range');
            }
        }

        if ($comment !== $this->archiveComment) {
            $this->archiveCommentChanges = $comment;
            $this->archiveCommentChanged = true;
        } else {
            $this->archiveCommentChanged = false;
        }
    }

    /**
     * Specify a password for extracting files.
     *
     * @param string|null $password
     *
     * @throws ZipException
     */
    public function setReadPassword($password)
    {
        foreach ($this->inputEntries as $entry) {
            if ($entry->isEncrypted()) {
                $entry->setPassword($password);
            }
        }
    }

    /**
     * @param string $entryName
     * @param string $password
     *
     * @throws ZipEntryNotFoundException
     * @throws ZipException
     */
    public function setReadPasswordEntry($entryName, $password)
    {
        if (!isset($this->inputEntries[$entryName])) {
            throw new ZipEntryNotFoundException($entryName);
        }

        if ($this->inputEntries[$entryName]->isEncrypted()) {
            $this->inputEntries[$entryName]->setPassword($password);
        }
    }

    /**
     * @return int|null
     */
    public function getZipAlign()
    {
        return $this->zipAlign;
    }

    /**
     * @param int|null $zipAlign
     */
    public function setZipAlign($zipAlign)
    {
        $this->zipAlign = $zipAlign === null ? null : (int) $zipAlign;
    }

    /**
     * @return bool
     */
    public function isZipAlign()
    {
        return $this->zipAlign !== null;
    }

    /**
     * @param string|null $writePassword
     */
    public function setWritePassword($writePassword)
    {
        $this->matcher()->all()->setPassword($writePassword);
    }

    /**
     * Remove password.
     */
    public function removePassword()
    {
        $this->matcher()->all()->setPassword(null);
    }

    /**
     * @param string|ZipEntry $entryName
     */
    public function removePasswordEntry($entryName)
    {
        $this->matcher()->add($entryName)->setPassword(null);
    }

    /**
     * @return bool
     */
    public function isArchiveCommentChanged()
    {
        return $this->archiveCommentChanged;
    }

    /**
     * @param string|ZipEntry $old
     * @param string|ZipEntry $new
     *
     * @throws ZipException
     */
    public function renameEntry($old, $new)
    {
        $old = $old instanceof ZipEntry ? $old->getName() : (string) $old;
        $new = $new instanceof ZipEntry ? $new->getName() : (string) $new;

        if (isset($this->outEntries[$new])) {
            throw new InvalidArgumentException('New entry name ' . $new . ' is exists.');
        }

        $entry = $this->getEntryForChanges($old);
        $entry->setName($new);
        $this->deleteEntry($old);
        $this->addEntry($entry);
    }

    /**
     * @param string|ZipEntry $entry
     *
     * @throws ZipEntryNotFoundException
     * @throws ZipException
     *
     * @return ZipChangesEntry|ZipEntry
     */
    public function getEntryForChanges($entry)
    {
        $entry = $this->getEntry($entry);

        if ($entry instanceof ZipSourceEntry) {
            $entry = new ZipChangesEntry($entry);
            $this->addEntry($entry);
        }

        return $entry;
    }

    /**
     * @param string|ZipEntry $entryName
     *
     * @throws ZipEntryNotFoundException
     *
     * @return ZipEntry
     */
    public function getEntry($entryName)
    {
        $entryName = $entryName instanceof ZipEntry ? $entryName->getName() : (string) $entryName;

        if (isset($this->outEntries[$entryName])) {
            return $this->outEntries[$entryName];
        }

        throw new ZipEntryNotFoundException($entryName);
    }

    /**
     * @param string|ZipEntry $entry
     *
     * @return bool
     */
    public function deleteEntry($entry)
    {
        $entry = $entry instanceof ZipEntry ? $entry->getName() : (string) $entry;

        if (isset($this->outEntries[$entry])) {
            unset($this->outEntries[$entry]);

            return true;
        }

        return false;
    }

    /**
     * @param ZipEntry $entry
     */
    public function addEntry(ZipEntry $entry)
    {
        $this->outEntries[$entry->getName()] = $entry;
    }

    /**
     * Get all entries with changes.
     *
     * @return ZipEntry[]
     */
    public function &getEntries()
    {
        return $this->outEntries;
    }

    /**
     * @param string|ZipEntry $entryName
     *
     * @return bool
     */
    public function hasEntry($entryName)
    {
        $entryName = $entryName instanceof ZipEntry ? $entryName->getName() : (string) $entryName;

        return isset($this->outEntries[$entryName]);
    }

    /**
     * Delete all entries.
     */
    public function deleteAll()
    {
        $this->outEntries = [];
    }

    /**
     * Count elements of an object.
     *
     * @see http://php.net/manual/en/countable.count.php
     *
     * @return int The custom count as an integer.
     *             </p>
     *             <p>
     *             The return value is cast to an integer.
     *
     * @since 5.1.0
     */
    public function count()
    {
        return \count($this->outEntries);
    }

    /**
     * Undo all changes done in the archive.
     */
    public function unchangeAll()
    {
        $this->outEntries = $this->inputEntries;
        $this->unchangeArchiveComment();
    }

    /**
     * Undo change archive comment.
     */
    public function unchangeArchiveComment()
    {
        $this->archiveCommentChanges = null;
        $this->archiveCommentChanged = false;
    }

    /**
     * Revert all changes done to an entry with the given name.
     *
     * @param string|ZipEntry $entry Entry name or ZipEntry
     *
     * @return bool
     */
    public function unchangeEntry($entry)
    {
        $entry = $entry instanceof ZipEntry ? $entry->getName() : (string) $entry;

        if (isset($this->outEntries[$entry], $this->inputEntries[$entry])) {
            $this->outEntries[$entry] = $this->inputEntries[$entry];

            return true;
        }

        return false;
    }

    /**
     * @param int $encryptionMethod
     */
    public function setEncryptionMethod($encryptionMethod = ZipFile::ENCRYPTION_METHOD_WINZIP_AES_256)
    {
        $this->matcher()->all()->setEncryptionMethod($encryptionMethod);
    }

    /**
     * @return ZipEntryMatcher
     */
    public function matcher()
    {
        return new ZipEntryMatcher($this);
    }
}