//
//  NCDataSource.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 06/09/2020.
//  Copyright © 2020 Marino Faggiana. All rights reserved.
//
//  Author Marino Faggiana <marino.faggiana@nextcloud.com>
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

import Foundation

@objc class NCDataSource: NSObject {
    
    @objc var metadatas: [tableMetadata] = []
    @objc var sections: Int = 1
    
    @objc init(metadatasSource: [tableMetadata], sort: String, ascending: Bool, groupBy: String? = nil, directoryOnTop: Bool, filterLivePhoto: Bool) {
        
        var metadatasFavorite: [tableMetadata] = []
        var numDirectory: Int = 0
        var numDirectoryFavorite:Int = 0

        /*
        Metadata order
        */
        
        let metadatasSourceSorted = metadatasSource.sorted { (obj1:tableMetadata, obj2:tableMetadata) -> Bool in
            if sort == "date" {
                if ascending {
                    return obj1.date.compare(obj2.date as Date) == ComparisonResult.orderedAscending
                } else {
                    return obj1.date.compare(obj2.date as Date) == ComparisonResult.orderedDescending
                }
            } else if sort == "sessionTaskIdentifier" {
                if ascending {
                    return obj1.sessionTaskIdentifier > obj2.sessionTaskIdentifier
                } else {
                    return obj1.sessionTaskIdentifier < obj2.sessionTaskIdentifier
                }
            } else if sort == "size" {
                if ascending {
                    return obj1.size > obj2.size
                } else {
                    return obj1.size < obj2.size
                }
            } else {
                let range = Range(NSMakeRange(0, obj1.fileNameView.count), in: obj1.fileNameView)
                if ascending {
                    return obj1.fileNameView.compare(obj2.fileNameView, options: .caseInsensitive, range: range, locale: .current) == ComparisonResult.orderedAscending
                } else {
                    return obj1.fileNameView.compare(obj2.fileNameView, options: .caseInsensitive, range: range, locale: .current) == ComparisonResult.orderedDescending
                }
            }
        }
        
        /*
        Initialize datasource
        */
        
        for metadata in metadatasSourceSorted {
            
            // skipped livePhoto
            if metadata.ext == "mov" && metadata.livePhoto {
                continue
            }
            
            if metadata.directory && directoryOnTop {
                if metadata.favorite {
                    metadatas.insert(metadata, at: numDirectoryFavorite)
                    numDirectoryFavorite += 1
                    numDirectory += 1
                } else {
                    metadatas.insert(metadata, at: numDirectory)
                    numDirectory += 1
                }
            } else {
                if metadata.favorite && directoryOnTop {
                    metadatasFavorite.append(metadata)
                } else {
                    metadatas.append(metadata)
                }
            }
        }
        if directoryOnTop && metadatasFavorite.count > 0 {
            metadatas.insert(contentsOf: metadatasFavorite, at: numDirectory)
        }
                
        /*
        if (directoryOnTop && metadataFilesFavorite.count > 0) {
            [sectionDataSource.metadatas insertObjects:metadataFilesFavorite atIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(numDirectoryFavorite, metadataFilesFavorite.count)]]; // Add Favorite files at end of favorite folders
        }
        */
    }
    
    @objc func cellForItemAt(indexPath: IndexPath) -> tableMetadata? {
        
        let row = indexPath.row
        
        if row > self.metadatas.count - 1 {
            return nil
        } else {
            return metadatas[row]
        }
    }
    
    @objc func numberOfItemsInSection(section: Int) -> Int {
        return metadatas.count
    }
    
    func getFilesInformation() -> (directories: Int,  files: Int, size: Double) {

        var directories: Int = 0
        var files: Int = 0
        var size: Double = 0

        for metadata in metadatas {
            if metadata.directory {
                directories += 1
            } else {
                files += 1
            }
            size = size + metadata.size
        }
        
        return (directories, files, size)
    }
    
    @objc func getIndexPathAt(metadata: tableMetadata) -> IndexPath? {
        var row: Int = 0
        for metadataCount in metadatas {
            if metadataCount.ocId == metadata.ocId {
                return IndexPath(row: row, section: 0)
            }
            row += 1
        }
        return nil
    }
    
    @objc func reloadItemAt(indexPath: IndexPath) -> [tableMetadata] {
        let row = indexPath.row
        
        if row > self.metadatas.count - 1 {
            let metadata = metadatas[row]
            if let metadata = NCManageDatabase.sharedInstance.getMetadata(predicate: NSPredicate(format: "ocId == %@", metadata.ocId)) {
                metadatas[row] = metadata
            }
        }
        
        return metadatas
    }
    
    @objc func deleteItemAt(indexPath: IndexPath) -> [tableMetadata] {
        let row = indexPath.row
        if row > self.metadatas.count - 1 {
            metadatas.remove(at: row)
        }
        
        return metadatas
    }
}