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<?php

namespace Shaarli;

use DateTime;
use Exception;

class HistoryTest extends \PHPUnit\Framework\TestCase
{
    /**
     * @var string History file path
     */
    protected static $historyFilePath = 'sandbox/history.php';

    /**
     * Delete history file.
     */
    public function tearDown()
    {
        @unlink(self::$historyFilePath);
    }

    /**
     * Test that the history file is created if it doesn't exist.
     */
    public function testConstructLazyLoading()
    {
        new History(self::$historyFilePath);
        $this->assertFileNotExists(self::$historyFilePath);
    }

    /**
     * Test that the history file is created if it doesn't exist.
     */
    public function testAddEventCreateFile()
    {
        $history = new History(self::$historyFilePath);
        $history->updateSettings();
        $this->assertFileExists(self::$historyFilePath);
    }

    /**
     * Not writable history file: raise an exception.
     *
     * @expectedException Exception
     * @expectedExceptionMessage History file isn't readable or writable
     */
    public function testConstructNotWritable()
    {
        touch(self::$historyFilePath);
        chmod(self::$historyFilePath, 0440);
        $history = new History(self::$historyFilePath);
        $history->updateSettings();
    }

    /**
     * Not parsable history file: raise an exception.
     *
     * @expectedException Exception
     * @expectedExceptionMessageRegExp /Could not parse history file/
     */
    public function testConstructNotParsable()
    {
        file_put_contents(self::$historyFilePath, 'not parsable');
        $history = new History(self::$historyFilePath);
        // gzinflate generates a warning
        @$history->updateSettings();
    }

    /**
     * Test add link event
     */
    public function testAddLink()
    {
        $history = new History(self::$historyFilePath);
        $history->addLink(['id' => 0]);
        $actual = $history->getHistory()[0];
        $this->assertEquals(History::CREATED, $actual['event']);
        $this->assertTrue(new DateTime('-2 seconds') < $actual['datetime']);
        $this->assertEquals(0, $actual['id']);

        $history = new History(self::$historyFilePath);
        $history->addLink(['id' => 1]);
        $actual = $history->getHistory()[0];
        $this->assertEquals(History::CREATED, $actual['event']);
        $this->assertTrue(new DateTime('-2 seconds') < $actual['datetime']);
        $this->assertEquals(1, $actual['id']);

        $history = new History(self::$historyFilePath);
        $history->addLink(['id' => 'str']);
        $actual = $history->getHistory()[0];
        $this->assertEquals(History::CREATED, $actual['event']);
        $this->assertTrue(new DateTime('-2 seconds') < $actual['datetime']);
        $this->assertEquals('str', $actual['id']);
    }

    /**
     * Test updated link event
     */
    public function testUpdateLink()
    {
        $history = new History(self::$historyFilePath);
        $history->updateLink(['id' => 1]);
        $actual = $history->getHistory()[0];
        $this->assertEquals(History::UPDATED, $actual['event']);
        $this->assertTrue(new DateTime('-2 seconds') < $actual['datetime']);
        $this->assertEquals(1, $actual['id']);
    }

    /**
     * Test delete link event
     */
    public function testDeleteLink()
    {
        $history = new History(self::$historyFilePath);
        $history->deleteLink(['id' => 1]);
        $actual = $history->getHistory()[0];
        $this->assertEquals(History::DELETED, $actual['event']);
        $this->assertTrue(new DateTime('-2 seconds') < $actual['datetime']);
        $this->assertEquals(1, $actual['id']);
    }

    /**
     * Test updated settings event
     */
    public function testUpdateSettings()
    {
        $history = new History(self::$historyFilePath);
        $history->updateSettings();
        $actual = $history->getHistory()[0];
        $this->assertEquals(History::SETTINGS, $actual['event']);
        $this->assertTrue(new DateTime('-2 seconds') < $actual['datetime']);
        $this->assertEmpty($actual['id']);
    }

    /**
     * Make sure that new items are stored at the beginning
     */
    public function testHistoryOrder()
    {
        $history = new History(self::$historyFilePath);
        $history->updateLink(['id' => 1]);
        $actual = $history->getHistory()[0];
        $this->assertEquals(History::UPDATED, $actual['event']);
        $this->assertTrue(new DateTime('-2 seconds') < $actual['datetime']);
        $this->assertEquals(1, $actual['id']);

        $history->addLink(['id' => 1]);
        $actual = $history->getHistory()[0];
        $this->assertEquals(History::CREATED, $actual['event']);
        $this->assertTrue(new DateTime('-2 seconds') < $actual['datetime']);
        $this->assertEquals(1, $actual['id']);
    }

    /**
     * Re-read history from file after writing an event
     */
    public function testHistoryRead()
    {
        $history = new History(self::$historyFilePath);
        $history->updateLink(['id' => 1]);
        $history = new History(self::$historyFilePath);
        $actual = $history->getHistory()[0];
        $this->assertEquals(History::UPDATED, $actual['event']);
        $this->assertTrue(new DateTime('-2 seconds') < $actual['datetime']);
        $this->assertEquals(1, $actual['id']);
    }

    /**
     * Re-read history from file after writing an event and make sure that the order is correct
     */
    public function testHistoryOrderRead()
    {
        $history = new History(self::$historyFilePath);
        $history->updateLink(['id' => 1]);
        $history->addLink(['id' => 1]);

        $history = new History(self::$historyFilePath);
        $actual = $history->getHistory()[0];
        $this->assertEquals(History::CREATED, $actual['event']);
        $this->assertTrue(new DateTime('-2 seconds') < $actual['datetime']);
        $this->assertEquals(1, $actual['id']);

        $actual = $history->getHistory()[1];
        $this->assertEquals(History::UPDATED, $actual['event']);
        $this->assertTrue(new DateTime('-2 seconds') < $actual['datetime']);
        $this->assertEquals(1, $actual['id']);
    }

    /**
     * Test retention time: delete old entries.
     */
    public function testHistoryRententionTime()
    {
        $history = new History(self::$historyFilePath, 5);
        $history->updateLink(['id' => 1]);
        $this->assertEquals(1, count($history->getHistory()));
        $arr = $history->getHistory();
        $arr[0]['datetime'] = new DateTime('-1 hour');
        FileUtils::writeFlatDB(self::$historyFilePath, $arr);

        $history = new History(self::$historyFilePath, 60);
        $this->assertEquals(1, count($history->getHistory()));
        $this->assertEquals(1, $history->getHistory()[0]['id']);
        $history->updateLink(['id' => 2]);
        $this->assertEquals(1, count($history->getHistory()));
        $this->assertEquals(2, $history->getHistory()[0]['id']);
    }
}