//
//  ImageExtensionGenerator.swift
//  
//
//  Created by Thibaut Schmitt on 14/02/2022.
//

import ToolCore
import Foundation

class ImageExtensionGenerator {
    
    // MARK: - pragm
    
    static func generateExtensionFile(images: [ParsedImage],
                                      staticVar: Bool,
                                      inputFilename: String,
                                      extensionName: String,
                                      extensionFilePath: String) {
        // Create extension conten1t
        let extensionContent = Self.getExtensionContent(images: images,
                                                        staticVar: staticVar,
                                                        extensionName: extensionName,
                                                        inputFilename: inputFilename)
        
        // Write content
        let extensionFilePathURL = URL(fileURLWithPath: extensionFilePath)
        do {
            try extensionContent.write(to: extensionFilePathURL, atomically: false, encoding: .utf8)
        } catch (let error) {
            let error = ImagesError.writeFile(extensionFilePath, error.localizedDescription)
            print(error.localizedDescription)
            Images.exit(withError: error)
        }
    }
    
    // MARK: - Extension content
    
    static func getExtensionContent(images: [ParsedImage], staticVar: Bool, extensionName: String, inputFilename: String) -> String {
        [
            Self.getHeader(inputFilename: inputFilename, extensionClassname: extensionName),
            Self.getProperties(images: images, staticVar: staticVar),
            Self.getFooter()
        ]
            .joined(separator: "\n")
    }
    
    // MARK: - Extension part
    
    private static func getHeader(inputFilename: String, extensionClassname: String) -> String {
        """
        // Generated by ResgenSwift.\(Images.toolName) \(ResgenSwiftVersion)
        // Images from \(inputFilename)
        
        import UIKit
        
        extension \(extensionClassname) {
        """
    }
    
    private static func getProperties(images: [ParsedImage], staticVar: Bool) -> String {
        if staticVar {
            return images
                .map { "\n\($0.getStaticImageProperty())" }
                .joined(separator: "\n")
        }
        return images
            .map { "\n\($0.getImageProperty())" }
            .joined(separator: "\n")
    }
    
    private static func getFooter() -> String {
        """
        }
        """
    }
}