using System;
using System.Collections.Generic;

namespace Ichni.Story.Dialogue
{
    /// <summary>对话记录中一条已经实际显示或采用的内容。</summary>
    [Serializable]
    public sealed class DialogueHistoryEntry
    {
        public string speakerName;
        public string content;
        public bool isChoice;
    }

    /// <summary>
    /// 当前一次 TextBlock 对话专用的临时记录。
    /// <para>记录不会写入 ES3；开始下一次对话、正常结束或点击 Back 取消时都会清空，
    /// 因而它只承担 DialogUIPage 内的“本次对话回顾”职责。</para>
    /// </summary>
    public static class DialogueHistory
    {
        private static readonly List<DialogueHistoryEntry> EntriesInternal = new();

        public static IReadOnlyList<DialogueHistoryEntry> Entries => EntriesInternal;

        public static void BeginSession() => EntriesInternal.Clear();

        public static void AddLine(string speakerName, string content)
        {
            if (string.IsNullOrWhiteSpace(content))
                return;

            EntriesInternal.Add(new DialogueHistoryEntry
            {
                speakerName = speakerName ?? string.Empty,
                content = content,
                isChoice = false
            });
        }

        public static void AddChoice(string content)
        {
            if (string.IsNullOrWhiteSpace(content))
                return;

            EntriesInternal.Add(new DialogueHistoryEntry
            {
                speakerName = string.Empty,
                content = content,
                isChoice = true
            });
        }

        public static void Clear() => EntriesInternal.Clear();
    }
}