//
//  FontToolHelper.swift
//  
//
//  Created by Thibaut Schmitt on 13/12/2021.
//

import Foundation
import CLIToolCore

class FontToolHelper {
    static func getFontsData(fromInputFolder inputFolder: String) -> (fontsNames: [String], fontsFileNames: [String]) {
        // Get a enumerator for all files
        let fileManager = FileManager()
        
        guard fileManager.fileExists(atPath: inputFolder) else {
            FontTool.exit(withError: FontToolError.fcScan(path, task.terminationStatus, task.output))
        }
        
        let enumerator: FileManager.DirectoryEnumerator = fileManager.enumerator(atPath: inputFolder)!
        
        // Filters font files
        let fontsFileNames: [String] = (enumerator.allObjects as! [String])
            .filter {
                if $0.hasSuffix(".ttf") || $0.hasSuffix(".otf") {
                    return true
                }
                return false
            }
        
        // Get font name (font name and font file name can be different)
        let fontsNames = fontsFileNames.compactMap { getFontName(atPath: "\(inputFolder)/\($0)") }
        
        return (fontsNames: fontsNames, fontsFileNames: fontsFileNames)
    }
    
    private static func getFontName(atPath path: String) -> String {
        //print("fc-scan --format %{postscriptname} \(path)")
        // Get real font name
        let task = Shell.shell("fc-scan", "--format", "%{postscriptname}", path)
        
        guard let fontName = task.output, task.terminationStatus == 0 else {
            FontTool.exit(withError: FontToolError.fcScan(path, task.terminationStatus, task.output))
        }
        
        return fontName
    }
}