//
//  Analytics.swift
//
//
//  Created by Loris Perret on 08/12/2023.
//

import ToolCore
import Foundation
import ArgumentParser

struct Analytics: ParsableCommand {
    
    // MARK: - Command Configuration
    
    static var configuration = CommandConfiguration(
        abstract: "Generate analytics extension file.",
        version: ResgenSwiftVersion
    )
    
    // MARK: - Static
    
    static let toolName = "Analytics"
    static let defaultExtensionName = "Analytics"
    
    // MARK: - Command Options
    
    @OptionGroup var options: AnalyticsOptions
    
    // MARK: - Run
    
    mutating func run() {
        print("[\(Self.toolName)] Starting analytics generation")
        print("[\(Self.toolName)] Will use inputFile \(options.inputFile) to generate analytics for target: \(options.target)")

        // Check requirements
        guard checkRequirements() else { return }

        print("[\(Self.toolName)] Will generate analytics")
        
        // Check requirements
        guard checkRequirements() else { return }
        
        // Parse input file
        let sections = AnalyticsFileParser.parse(options.inputFile, target: options.target)
        
        // Generate extension
        AnalyticsGenerator.writeExtensionFiles(sections: sections,
                                          target: options.target,
                                          tags: ["ios", "iosonly"],
                                          staticVar: options.staticMembers,
                                          extensionName: options.extensionName,
                                          extensionFilePath: options.extensionFilePath)
        
        print("[\(Self.toolName)] Analytics generated")
    }
    
    // MARK: - Requirements
    
    private func checkRequirements() -> Bool {
        let fileManager = FileManager()
        
        // Input file
        guard fileManager.fileExists(atPath: options.inputFile) else {
            let error = AnalyticsError.fileNotExists(options.inputFile)
            print(error.description)
            Analytics.exit(withError: error)
        }

        guard TrackerType.hasValidTarget(in: options.target) else {
            let error = AnalyticsError.noValidTracker(options.target)
            print(error.description)
            Analytics.exit(withError: error)
        }

        // Check if needed to regenerate
        guard GeneratorChecker.shouldGenerate(force: options.forceGeneration,
                                              inputFilePath: options.inputFile,
                                              extensionFilePath: options.extensionFilePath) else {
            print("[\(Self.toolName)] Analytics are already up to date :) ")
            return false
        }
        
        return true
    }
}