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

import Foundation
import ToolCore

class FontExtensionGenerator {
    
    static func writeExtensionFile(fontsNames: [String], staticVar: Bool, extensionName: String, extensionFilePath: String) {
        // Check file if not exists
        let fileManager = FileManager()
        if fileManager.fileExists(atPath: extensionFilePath) == false {
            Shell.shell("touch", "\(extensionFilePath)")
        }
        
        // Create extension content
        let extensionContent = [
            Self.getHeader(extensionClassname: extensionName),
            Self.getFontNameEnum(fontsNames: fontsNames),
            Self.getFontMethods(fontsNames: fontsNames, staticVar: staticVar),
            Self.getFooter()
        ]
            .joined(separator: "\n")
        
        // Write content
        let extensionFilePathURL = URL(fileURLWithPath: extensionFilePath)
        do {
            try extensionContent.write(to: extensionFilePathURL, atomically: true, encoding: .utf8)
        } catch (let error) {
            let error = FontToolError.writeExtension(extensionFilePath, error.localizedDescription)
            print(error.localizedDescription)
            FontTool.exit(withError: error)
        }
    }
    
    private static func getHeader(extensionClassname: String) -> String {
        """
        // Generated by ResgenSwift.\(FontTool.toolName) \(ResgenSwiftVersion)
        
        import UIKit
        
        extension \(extensionClassname) {\n
        """
    }
    
    private static func getFontNameEnum(fontsNames: [String]) -> String {
        var enumDefinition = "\tenum FontName: String {\n"
        
        fontsNames.forEach {
            enumDefinition += "\t\tcase \($0.removeCharacters(from: "[]+-_")) = \"\($0)\"\n"
        }
        enumDefinition += "\t}\n"
        
        return enumDefinition
    }
    
    private static func getFontMethods(fontsNames: [FontName], staticVar: Bool) -> String {
        let pragma = "\t// MARK: - Getter"
            
        var propertiesOrMethods: [String] = fontsNames
            .unique()
            .map {
                if staticVar {
                    return $0.staticProperty
                } else {
                    return $0.method
                }
            }
        
        propertiesOrMethods.insert(pragma, at: 0)
        return propertiesOrMethods.joined(separator: "\n\n")
    }
    
    private static func getFooter() -> String {
        """
        }
        """
    }
}