using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Media;
using OpenCvSharp;

namespace TIASshot {
    /// <summary>
    /// ファイル I/O（CSV 読み書き・保存フォルダ生成・撮影情報出力）とサウンド再生の
    /// ユーティリティ．CameraBase から委譲される．状態を持たない．
    /// </summary>
    internal static class IoUtil {

        /// <summary>
        /// csvファイルからMatを読み込む
        /// </summary>
        /// <param name="csvFile"></param>
        /// <returns></returns>
        /// <exception cref="Exception"></exception>
        public static Mat LoadMatFromCsv(string csvFile) {
            try {
                var arr = new List<double[]>();
                int cols = -1;
                using (var reader = new StreamReader(csvFile)) {
                    while (!reader.EndOfStream) {
                        var line = reader.ReadLine();
                        var valStrs = line.Split(',');
                        if (cols == -1) cols = valStrs.Length;
                        else if (cols != valStrs.Length) throw new Exception("cols != valStrs.Length");
                        var vals = valStrs.Select(x => double.Parse(x)).ToArray();
                        arr.Add(vals);
                    }
                }
                var m = new Mat(arr.Count, cols, MatType.CV_64FC1);
                for (var row = 0; row < arr.Count; row++) {
                    for (var col = 0; col < cols; col++) {
                        m.At<double>(row, col) = arr[row][col];
                    }
                }
                return m;
            } catch (Exception) {
                return null;
            }
        }

        /// <summary>
        /// Matをcsvファイルに保存
        /// </summary>
        /// <param name="csvFile"></param>
        /// <param name="m"></param>
        public static void SaveMatToCsv(string csvFile, Mat m) {
            using (var writer = new StreamWriter(csvFile)) {
                for (var row = 0; row < m.Rows; row++) {
                    var line = "";
                    for (var col = 0; col < m.Cols; col++) {
                        if (col > 0) line += ",";
                        line += $"{m.At<double>(row, col):0.0000000}";
                    }
                    writer.WriteLine(line);
                }
            }
        }

        /// <summary>
        /// 保存フォルダを生成し，そのパスを返す
        /// </summary>
        /// <param name="note"></param>
        /// <returns>生成した保存フォルダのパス</returns>
        public static string CreateSaveFolder(string note) {
            var dt = DateTime.Now;
            var paths = new List<string>() {
                Config.GetString("File/SaveFolder"),
                dt.ToString("yyyy-MM-dd"),
                dt.ToString("HH_mm_ss") + $"-{note}",
            };
            var saveFolder = Path.Combine(paths.ToArray());
            Directory.CreateDirectory(saveFolder);
            return saveFolder;
        }

        /// <summary>
        /// 設定値をCSVファイルに書き込む
        /// </summary>
        /// <param name="sw"></param>
        /// <param name="info"></param>
        public static void WriteInfo(StreamWriter sw, Dictionary<string, string> info) {
            sw.WriteLine($"撮影日時,{DateTime.Now:yyyy/MM/dd HH:mm:ss}"); // 撮影日時を追加
            foreach (var kvp in info) {
                sw.WriteLine($"{kvp.Key},{kvp.Value}");
            }
        }

        /// <summary>
        /// 効果音を再生する
        /// </summary>
        /// <param name="wavfile"></param>
        public static void PlaySound(string wavfile) {
            if (!File.Exists(wavfile)) {
                Debug.WriteLine($"音声ファイルが見つかりません: {wavfile}");
                return;
            }
            try {
                using (var player = new SoundPlayer(wavfile)) {
                    player.Play();
                }
            } catch (Exception ex) {
                Debug.WriteLine($"音声再生に失敗しました: {ex.Message}");
            }
        }
    }
}