<?php

/**
 * @package     MokoSuiteBackup
 * @subpackage  com_mokosuitebackup
 * @author      Moko Consulting <hello@mokoconsulting.tech>
 * @copyright   Copyright (C) 2026 Moko Consulting. All rights reserved.
 * @license     GNU General Public License version 3 or later; see LICENSE
 */

namespace Joomla\Component\MokoSuiteBackup\Administrator\Model;

defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\MVC\Model\BaseDatabaseModel;
use Joomla\Component\MokoSuiteBackup\Administrator\Utility\BackupDirectory;

class DashboardModel extends BaseDatabaseModel
{
	/**
	 * Get the most recent completed backup record.
	 *
	 * @return  object|null
	 */
	public function getLastBackup(): ?object
	{
		$db    = $this->getDatabase();
		$query = $db->getQuery(true)
			->select('r.*, p.title AS profile_title')
			->from($db->quoteName('#__mokosuitebackup_records', 'r'))
			->join('LEFT', $db->quoteName('#__mokosuitebackup_profiles', 'p') . ' ON p.id = r.profile_id')
			->where($db->quoteName('r.status') . ' = ' . $db->quote('complete'))
			->order($db->quoteName('r.backupend') . ' DESC');
		$db->setQuery($query, 0, 1);

		return $db->loadObject() ?: null;
	}

	/**
	 * Query com_scheduler for the next scheduled MokoSuiteBackup task.
	 *
	 * @return  object|null  Object with next_execution and title, or null
	 */
	public function getNextScheduled(): ?object
	{
		$db = $this->getDatabase();

		try {
			$query = $db->getQuery(true)
				->select($db->quoteName(['t.next_execution', 't.title']))
				->from($db->quoteName('#__scheduler_tasks', 't'))
				->where($db->quoteName('t.type') . ' = ' . $db->quote('mokosuitebackup.run_profile'))
				->where($db->quoteName('t.state') . ' = 1')
				->order($db->quoteName('t.next_execution') . ' ASC');
			$db->setQuery($query, 0, 1);

			return $db->loadObject() ?: null;
		} catch (\Throwable $e) {
			return null;
		}
	}

	/**
	 * Get backup statistics.
	 *
	 * @return  object  Object with total_count, total_size, fail_count_7d
	 */
	public function getStats(): object
	{
		$db = $this->getDatabase();

		// Total completed backups and storage
		$query = $db->getQuery(true)
			->select('COUNT(*) AS total_count')
			->select('COALESCE(SUM(' . $db->quoteName('total_size') . '), 0) AS total_size')
			->from($db->quoteName('#__mokosuitebackup_records'))
			->where($db->quoteName('status') . ' = ' . $db->quote('complete'));
		$db->setQuery($query);
		$stats = $db->loadObject();

		// Failures in last 7 days
		$cutoff = date('Y-m-d H:i:s', strtotime('-7 days'));
		$query  = $db->getQuery(true)
			->select('COUNT(*) AS fail_count')
			->from($db->quoteName('#__mokosuitebackup_records'))
			->where($db->quoteName('status') . ' = ' . $db->quote('fail'))
			->where($db->quoteName('backupstart') . ' >= ' . $db->quote($cutoff));
		$db->setQuery($query);
		$stats->fail_count_7d = (int) $db->loadResult();

		return $stats;
	}

	/**
	 * Check system health for backup readiness.
	 *
	 * @return  array  Array of check results [{label, status, detail}]
	 */
	public function getSystemHealth(): array
	{
		$checks = [];

		// PHP version
		$checks[] = (object) [
			'label'  => 'PHP Version',
			'status' => version_compare(PHP_VERSION, '8.1.0', '>='),
			'detail' => PHP_VERSION,
		];

		// ZipArchive extension
		$checks[] = (object) [
			'label'  => 'ZipArchive',
			'status' => extension_loaded('zip'),
			'detail' => extension_loaded('zip') ? 'Loaded' : 'Not loaded',
		];

		// AES-256 encryption support
		$aesSupport = defined('ZipArchive::EM_AES_256');
		$checks[]   = (object) [
			'label'  => 'AES-256 Encryption',
			'status' => $aesSupport,
			'detail' => $aesSupport ? 'Available' : 'Requires libzip 1.2.0+',
		];

		// Backup directory writable — check the first published profile's dir
		$backupDir = BackupDirectory::getDefaultAbsolute();

		$db2 = $this->getDatabase();
		$qDir = $db2->getQuery(true)
			->select($db2->quoteName('backup_dir'))
			->from($db2->quoteName('#__mokosuitebackup_profiles'))
			->where($db2->quoteName('published') . ' = 1')
			->where($db2->quoteName('backup_dir') . ' != ' . $db2->quote(''))
			->where($db2->quoteName('backup_dir') . ' IS NOT NULL');
		$db2->setQuery($qDir, 0, 1);
		$profileDir = $db2->loadResult();

		if ($profileDir) {
			$backupDir = BackupDirectory::resolve($profileDir);
		}

		if (BackupDirectory::hasPlaceholders($backupDir)) {
			$checks[] = (object) [
				'label'  => 'Backup Directory',
				'status' => true,
				'detail' => 'Uses placeholders (resolved at backup time) — ' . $backupDir,
			];
		} else {
			$writable  = is_dir($backupDir) && is_writable($backupDir);
			$checks[]  = (object) [
				'label'  => 'Backup Directory',
				'status' => $writable,
				'detail' => ($writable ? 'Writable' : 'Not writable or missing') . ' — ' . $backupDir,
			];
		}

		// Disk space
		$freeSpace = @disk_free_space($backupDir ?: JPATH_ROOT);
		$freeGB    = $freeSpace ? round($freeSpace / 1073741824, 1) : 0;
		$checks[]  = (object) [
			'label'  => 'Free Disk Space',
			'status' => $freeGB >= 1.0,
			'detail' => $freeGB . ' GB free',
		];

		return $checks;
	}

	/**
	 * Check if any profiles use the default (web-root) backup directory.
	 *
	 * @return  bool
	 */
	public function isUsingDefaultBackupDir(): bool
	{
		$db    = $this->getDatabase();
		$query = $db->getQuery(true)
			->select($db->quoteName('backup_dir'))
			->from($db->quoteName('#__mokosuitebackup_profiles'))
			->where($db->quoteName('published') . ' = 1');
		$db->setQuery($query);
		$dirs = $db->loadColumn();

		// Warn only if any profile's resolved path is inside the web root
		foreach ($dirs as $dir) {
			$resolved = BackupDirectory::resolve($dir ?: BackupDirectory::DEFAULT_RELATIVE);

			if (BackupDirectory::hasPlaceholders($resolved)) {
				continue;
			}

			if (BackupDirectory::isWebAccessible($resolved)) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Get latest snapshot info for the dashboard widget.
	 */
	public function getLatestSnapshot(): ?object
	{
		$db    = $this->getDatabase();

		try {
			$query = $db->getQuery(true)
				->select('*')
				->from($db->quoteName('#__mokosuitebackup_snapshots'))
				->where($db->quoteName('status') . ' = ' . $db->quote('complete'))
				->order($db->quoteName('created') . ' DESC');
			$db->setQuery($query, 0, 1);

			return $db->loadObject() ?: null;
		} catch (\Throwable $e) {
			return null;
		}
	}

	/**
	 * Get snapshot count.
	 */
	public function getSnapshotCount(): int
	{
		$db = $this->getDatabase();

		try {
			$query = $db->getQuery(true)
				->select('COUNT(*)')
				->from($db->quoteName('#__mokosuitebackup_snapshots'));
			$db->setQuery($query);

			return (int) $db->loadResult();
		} catch (\Throwable $e) {
			return 0;
		}
	}

	/**
	 * Get backup size trend data for the last 30 days.
	 * Returns array of {date, total_size, count, status} grouped by day.
	 */
	public function getBackupTrend(): array
	{
		$db     = $this->getDatabase();
		$cutoff = date('Y-m-d', strtotime('-30 days'));

		$query = $db->getQuery(true)
			->select('DATE(' . $db->quoteName('backupstart') . ') AS backup_date')
			->select('SUM(' . $db->quoteName('total_size') . ') AS day_size')
			->select('COUNT(*) AS day_count')
			->select('SUM(CASE WHEN ' . $db->quoteName('status') . ' = ' . $db->quote('fail') . ' THEN 1 ELSE 0 END) AS fail_count')
			->from($db->quoteName('#__mokosuitebackup_records'))
			->where('DATE(' . $db->quoteName('backupstart') . ') >= ' . $db->quote($cutoff))
			->group('DATE(' . $db->quoteName('backupstart') . ')')
			->order('backup_date ASC');
		$db->setQuery($query);

		return $db->loadObjectList() ?: [];
	}

	/**
	 * Get storage breakdown by profile.
	 */
	public function getStorageByProfile(): array
	{
		$db = $this->getDatabase();

		$query = $db->getQuery(true)
			->select('p.title AS profile_title')
			->select('COUNT(*) AS backup_count')
			->select('COALESCE(SUM(r.total_size), 0) AS total_size')
			->from($db->quoteName('#__mokosuitebackup_records', 'r'))
			->join('LEFT', $db->quoteName('#__mokosuitebackup_profiles', 'p') . ' ON p.id = r.profile_id')
			->where($db->quoteName('r.status') . ' = ' . $db->quote('complete'))
			->group($db->quoteName('r.profile_id'))
			->order('total_size DESC');
		$db->setQuery($query);

		return $db->loadObjectList() ?: [];
	}

	/**
	 * Get published backup profiles for the quick-action selector.
	 *
	 * @return  array
	 */
	public function getProfiles(): array
	{
		$db    = $this->getDatabase();
		$query = $db->getQuery(true)
			->select($db->quoteName(['id', 'title', 'backup_type']))
			->from($db->quoteName('#__mokosuitebackup_profiles'))
			->where($db->quoteName('published') . ' = 1')
			->order($db->quoteName('id') . ' ASC');
		$db->setQuery($query);

		return $db->loadObjectList() ?: [];
	}
}