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

import Foundation

public class Shell {
    
    @discardableResult
    public static func shell(_ args: String...) -> (terminationStatus: Int32, output: String?) {
        let task = Process()
        task.launchPath = "/usr/bin/env"
        task.arguments = args
        
        let pipe = Pipe()
        task.standardOutput = pipe
        task.launch()
        task.waitUntilExit()
        
        let data = pipe.fileHandleForReading.readDataToEndOfFile()
        
        guard let output: String = String(data: data, encoding: .utf8) else {
            return (terminationStatus: task.terminationStatus, output: nil)
        }
        
        return (terminationStatus: task.terminationStatus, output: output)
    }
}

public class GeneratorChecker {
    
    /// Return `true` if  inputFile is newer than extensionFile, otherwise `false`
    public static func shouldGenerate(force: Bool, inputFilePath: String, extensionFilePath: String) -> Bool {
        guard force == false else {
            return true
        }
        
        // If inputFile is newer that generated extension -> Regenerate
        let extensionFileURL = URL(fileURLWithPath: extensionFilePath)
        let inputFileURL = URL(fileURLWithPath: inputFilePath)
        
        let extensionRessourceValues = try? extensionFileURL.resourceValues(forKeys: [URLResourceKey.contentModificationDateKey])
        let inputFileRessourceValues = try? inputFileURL.resourceValues(forKeys: [URLResourceKey.contentModificationDateKey])
        
        if let extensionModificationDate = extensionRessourceValues?.contentModificationDate,
           let inputFileModificationDate = inputFileRessourceValues?.contentModificationDate {
            if inputFileModificationDate >= extensionModificationDate {
                print("Input file is newer that generated extension.")
                return true
            } else {
                return false
            }
        }
    
        // ModificationDate not available for both file
        print("⚠️ Could not compare file modication date. ⚠️")
        return true
    }
    
}