/*
 Copyright (C) 2024 Rubén Beltrán del Río

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program. If not, see https://captura.tranquil.systems.
 */
import Foundation

protocol ConfigureActionProtocol {
  var action: String { get }
  var fps: Int? { get }
  var outputs: OutputFormatSetting? { get }
  var backend: URL? { get }
  var backendOutput: OutputFormatSetting? { get }
  var keepLocalFiles: Bool? { get }
}

protocol RecordActionProtocol {
  var action: String { get }
  
  var x: Int? { get }
  var y: Int? { get }
  var width: Int? { get }
  var height: Int? { get }
  var preventResize: Bool? { get }
  var preventMove: Bool? { get }
  var fps: Int? { get }
  var backend: URL? { get }
  var outputs: OutputFormatSetting? { get }
  var backendOutput: OutputFormatSetting? { get }
  var keepLocalFiles: Bool? { get }
  var autoStart: Bool? { get }
  var skipBackend: Bool { get }
  var maxLength: Int? { get }
}

// The concrete implementations
struct ConfigureAction: ConfigureActionProtocol {
  let action: String
  var fps: Int?
  var outputs: OutputFormatSetting?
  var backend: URL?
  var backendOutput: OutputFormatSetting?
  var keepLocalFiles: Bool?
}

struct RecordAction: RecordActionProtocol {
  let action: String
  var x: Int?
  var y: Int?
  var width: Int?
  var height: Int?
  var preventResize: Bool?
  var preventMove: Bool?
  var fps: Int?
  var outputs: OutputFormatSetting?
  var backend: URL?
  var backendOutput: OutputFormatSetting?
  var keepLocalFiles: Bool?
  var autoStart: Bool?
  var skipBackend: Bool
  var maxLength: Int?
}

enum CapturaAction {
    case record(RecordAction)
    case configure(ConfigureAction)
}

struct CapturaURLDecoder {
  
  static func decodeParams(url: URL) -> CapturaAction? {
      guard let components = URLComponents(url: url, resolvingAgainstBaseURL: false),
            let params = components.queryItems else {
          return nil
      }

      var paramsDict = [String: Any]()

      params.forEach { item in
          paramsDict[item.name] = item.value
      }

      guard let action = paramsDict["action"] as? String else {
          return nil
      }

      switch action {
      case "configure":
        var fps = Int(paramsDict["fps"] as? String ?? "")
        let backend = URL(string: paramsDict["backend"] as? String ?? "")
        let keepLocalFiles = Bool(paramsDict["keep_local_files"] as? String ?? "")
        let outputs = OutputFormatSetting(paramsDict["outputs"] as? String ?? "")
        var backendOutput = OutputFormatSetting(paramsDict["backend_output"] as? String ?? "")
        
        if fps != nil {
          fps = min(10, max(4, fps!))
        }
        
        if backendOutput == .all {
          backendOutput = .gifOnly
        }
        
        return .configure(ConfigureAction(
          action: action,
          fps: fps,
          outputs: outputs,
          backend: backend,
          backendOutput: backendOutput,
          keepLocalFiles: keepLocalFiles
        ))

      case "record":
        let x = Int(paramsDict["x"] as? String ?? "")
        let y = Int(paramsDict["y"] as? String ?? "")
        let width = Int(paramsDict["width"] as? String ?? "")
        let height = Int(paramsDict["height"] as? String ?? "")
        let preventResize = Bool(paramsDict["prevent_resize"] as? String ?? "")
        let preventMove = Bool(paramsDict["prevent_move"] as? String ?? "")
        var fps = Int(paramsDict["fps"] as? String ?? "")
        let backend = URL(string: paramsDict["backend"] as? String ?? "")
        let keepLocalFiles = Bool(paramsDict["keep_local_files"] as? String ?? "")
        let outputs = OutputFormatSetting(paramsDict["outputs"] as? String ?? "")
        var backendOutput = OutputFormatSetting(paramsDict["backend_output"] as? String ?? "")
        let autoStart = Bool(paramsDict["auto_start"] as? String ?? "")
        var maxLength = Int(paramsDict["max_length"] as? String ?? "")
        
        if fps != nil {
          fps = min(10, max(4, fps!))
        }
        
        if maxLength != nil {
          maxLength = min(300, max(1, fps!))
        }
        
        if backendOutput == .all {
          backendOutput = .gifOnly
        }
        
        var skipBackend = false
        if let backendString = paramsDict["backend"] as? String {
          if backendString == "" {
            skipBackend = true
          }
        }
        
        return .record(RecordAction(
          action: action,
          x: x,
          y: y,
          width: width,
          height: height,
          preventResize: preventResize,
          preventMove: preventMove,
          fps: fps,
          outputs: outputs,
          backend: backend,
          backendOutput: backendOutput,
          keepLocalFiles: keepLocalFiles,
          autoStart: autoStart,
          skipBackend: skipBackend,
          maxLength: maxLength
        ))

      default:
          return nil
      }
  }
}