using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static PDFMonitor_SVG.Entities;

namespace PDFMonitor_SVG {
    internal class Entities {
        public const int DEFAULT_DPI = 96;
        public const double DEFAULT_RATIO = 25.4;

        public static int px2mm(double px) {
            return (int)Math.Round(px / DEFAULT_DPI * DEFAULT_RATIO);
        }

        //仿FixedThreadPool
        public class FixedThreadPool {
            private readonly BlockingCollection<Action> _taskQueue;
            private readonly Thread[] _threads;

            public FixedThreadPool(int size) {
                _taskQueue = new BlockingCollection<Action>();
                _threads = new Thread[size];

                for (int i = 0; i < size; i++) {
                    _threads[i] = new Thread(Worker);
                    _threads[i].Start();
                }
            }

            public void Execute(Action action) {
                _taskQueue.Add(action);
            }

            private void Worker() {
                foreach (var task in _taskQueue.GetConsumingEnumerable()) {
                    task();
                }
            }

            public void Shutdown() {
                _taskQueue.CompleteAdding();
                foreach (var thread in _threads) {
                    thread.Join();
                }
            }
        }


        public class SVGTaskInfo {
            private string width;
            private string height;
            private string svgPath;
            private string svgFileName;

            public SVGTaskInfo() {
            }

            public string SvgPath { get => svgPath; set => svgPath = value; }
            public string Height { get => height; set => height = value; }
            public string Width { get => width; set => width = value; }
            public string SvgFileName { get => svgFileName; set => svgFileName = value; }
        }
    }
}