//
//  main.swift
//  
//
//  Created by Thibaut Schmitt on 20/12/2021.
//

import ToolCore
import Foundation
import ArgumentParser

struct ColorTool: ParsableCommand {
    
    // MARK: - CommandConfiguration
    
    static var configuration = CommandConfiguration(
        abstract: "A utility for generate colors assets and their getters.",
        version: ResgenSwiftVersion
    )
    
    // MARK: - Static
    
    static let toolName = "ColorTool"
    static let defaultExtensionName = "UIColor"
    static let assetsColorsFolderName = "Colors"
    
    // MARK: - Properties
    
    var extensionFileName: String {
        if options.extensionSuffix.isEmpty == false {
            return "\(options.extensionName)+\(options.extensionSuffix).swift"
        }
        return "\(options.extensionName).swift"
    }
    var extensionFilePath: String { "\(options.extensionOutputPath)/\(extensionFileName)" }
    var generateStaticVariable: Bool {
        options.extensionName == Self.defaultExtensionName
    }
    
    // MARK: - Command options
    
    @OptionGroup var options: ColorToolOptions
    
    // MARK: - Run
    
    public func run() throws {
        print("[\(Self.toolName)] Starting colors generation")
        print("[\(Self.toolName)] Will use inputFile \(options.inputFile) to generate \(options.colorStyle) colors in xcassets \(options.xcassetsPath)")
        
        // Check requirements
        guard checkRequirements() else { return }
        
        print("[\(Self.toolName)] Will generate colors")
        
        // Delete current colors
        deleteCurrentColors()
        
        // Get colors to generate
        let parsedColors = ColorFileParser.parse(options.inputFile,
                                                colorStyle: options.colorStyle)
        
        // Generate all colors in xcassets
        ColorXcassetHelper.generateXcassetColors(colors: parsedColors,
                                                 to: options.xcassetsPath)
        
        // Generate extension
        ColorExtensionGenerator.writeExtensionFile(colors: parsedColors,
                                                   staticVar: generateStaticVariable,
                                                   extensionName: options.extensionName,
                                                   extensionFilePath: extensionFilePath)
        
        print("[\(Self.toolName)] Colors generated")
    }
    
    // MARK: - Requirements
    
    private func checkRequirements() -> Bool {
        let fileManager = FileManager()
        
        // Check if input file exists
        guard fileManager.fileExists(atPath: options.inputFile) else {
            let error = ColorToolError.fileNotExists(options.inputFile)
            print(error.localizedDescription)
            ColorTool.exit(withError: error)
        }
        
        // Check if xcassets file exists
        guard fileManager.fileExists(atPath: options.xcassetsPath) else {
            let error = ColorToolError.fileNotExists(options.xcassetsPath)
            print(error.localizedDescription)
            ColorTool.exit(withError: error)
        }
        
        // Check if needed to regenerate
        guard GeneratorChecker.shouldGenerate(force: options.forceGeneration, inputFilePath: options.inputFile, extensionFilePath: extensionFilePath) else {
            print("[\(Self.toolName)] Colors are already up to date :) ")
            return false
        }
        
        return true
    }
    
    // MARK: - Helpers
    
    private func deleteCurrentColors() {
        Shell.shell("rm", "-rf", "\(options.xcassetsPath)/Colors/*")
    }
}

ColorTool.main()

/*
 Command samples:
 
 1. UIColor extension without suffix
 swift run -c release ColorToolCore -f ./SampleFiles/Colors/sampleColors1.txt --style all --xcassets-path "./SampleFiles/Colors/colors.xcassets" --extension-output-path "./SampleFiles/Colors/Generated/" --extension-name "UIColor"
 
 2. UIColor extension with custom suffix
 swift run -c release ColorToolCore -f ./SampleFiles/Colors/sampleColors1.txt --style all --xcassets-path "./SampleFiles/Colors/colors.xcassets" --extension-output-path "./SampleFiles/Colors/Generated/" --extension-name "UIColor" --extension-suffix "SampleApp"
 
 3. Custom extension with only light theme colors (R2Color)
 swift run -c release ColorToolCore -f ./SampleFiles/Colors/sampleColors1.txt --style light --xcassets-path "./SampleFiles/Colors/colors.xcassets" --extension-output-path "./SampleFiles/Colors/Generated/" --extension-name "R2Color"
 */