// CFileSpeedDlg.h
// 文件传输速度调节对话框：拖动滑块选档位，实时显示预估速度。
// 纯主控端 UI 偏好，持久化由 CMy2015RemoteDlg::OnFileTransferSpeed() 负责。
// 仅在 2015RemoteDlg.cpp 中 include 一次（头文件内联实现 + 消息映射，勿多处包含）。
#pragma once

#include "LangManager.h"
#include <afxcmn.h>

// 档位表（权威来源：docs/FileTransferSpeed_Design.md §3）。
// chunkKb * 1024 / durationMs 即理论字节/秒；durationMs==0 表示不人为限速。
struct FileSpeedTier { int chunkKb; int durMs; const TCHAR* name; };

static const FileSpeedTier kFileSpeedTiers[] = {
    {   64, 200, _T("最慢")   },   // ≈0.31 MB/s
    {   64, 100, _T("慢")     },   // ≈0.63 MB/s
    {   64,  50, _T("默认")   },   // ≈1.25 MB/s
    {  128,  50, _T("快")     },   // ≈2.5  MB/s
    {  256,  50, _T("更快")   },   // ≈5    MB/s
    {  512,  50, _T("很快")   },   // ≈10   MB/s
    { 1024,   0, _T("不限速") },   // 网络上限
};
#define FILE_SPEED_TIER_COUNT 7
#define FILE_SPEED_DEFAULT_TIER 2   // 默认档位

class CFileSpeedDlg : public CDialog
{
public:
    enum { IDD = IDD_FILE_SPEED };

    CFileSpeedDlg(int chunkKb, int durMs, CWnd* pParent = NULL)
        : CDialog(CFileSpeedDlg::IDD, pParent), m_chunkKb(chunkKb), m_durMs(durMs)
    {
    }

    int GetChunkKb() const { return m_chunkKb; }
    int GetDurMs()   const { return m_durMs; }

protected:
    int m_chunkKb;
    int m_durMs;

    static int TierIndexFor(int chunkKb, int durMs)
    {
        for (int i = 0; i < FILE_SPEED_TIER_COUNT; i++)
            if (kFileSpeedTiers[i].chunkKb == chunkKb && kFileSpeedTiers[i].durMs == durMs)
                return i;
        return FILE_SPEED_DEFAULT_TIER;   // 未知值回落默认
    }

    static void FormatSpeed(int idx, CString& out)
    {
        const FileSpeedTier& t = kFileSpeedTiers[idx];
        // 档位名与格式串经 _TR/_LF 走多语言表（LangManager），语言文件以中文原文为 key。
        if (t.durMs <= 0) {
            out.FormatL(_T("%s · 不受限速（受网络带宽约束）"), _LF(t.name));
            return;
        }
        double mbps = (double)t.chunkKb * 1024.0 / (t.durMs / 1000.0) / (1024.0 * 1024.0);
        out.FormatL(_T("%s · 约 %.2f MB/s"), _LF(t.name), mbps);
    }

    int GetSliderPos()
    {
        int pos = (int)SendDlgItemMessage(IDC_FSPEED_SLIDER, TBM_GETPOS, 0, 0);
        if (pos < 0)                          pos = 0;
        if (pos >= FILE_SPEED_TIER_COUNT)     pos = FILE_SPEED_TIER_COUNT - 1;
        return pos;
    }

    void UpdateLabel()
    {
        CString s;
        FormatSpeed(GetSliderPos(), s);
        SetDlgItemText(IDC_FSPEED_LABEL, s);
    }

    virtual BOOL OnInitDialog() override
    {
        CDialog::OnInitDialog();

        SendDlgItemMessage(IDC_FSPEED_SLIDER, TBM_SETRANGE, TRUE,
                           MAKELONG(0, FILE_SPEED_TIER_COUNT - 1));
        SendDlgItemMessage(IDC_FSPEED_SLIDER, TBM_SETPAGESIZE, 0, 1);
        SendDlgItemMessage(IDC_FSPEED_SLIDER, TBM_SETTICFREQ, 0, 1);
        SendDlgItemMessage(IDC_FSPEED_SLIDER, TBM_SETPOS, TRUE, TierIndexFor(m_chunkKb, m_durMs));

        UpdateLabel();
        TranslateDialog(this);
        return TRUE;
    }

    virtual void OnOK() override
    {
        int idx = GetSliderPos();
        m_chunkKb = kFileSpeedTiers[idx].chunkKb;
        m_durMs   = kFileSpeedTiers[idx].durMs;
        CDialog::OnOK();
    }

    afx_msg void OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
    {
        (void)nSBCode; (void)nPos; (void)pScrollBar;
        UpdateLabel();   // 拖动过程中实时刷新预估速度
    }

    virtual BOOL OnCommand(WPARAM wParam, LPARAM lParam) override
    {
        if (LOWORD(wParam) == IDC_FSPEED_RESET && HIWORD(wParam) == BN_CLICKED) {
            SendDlgItemMessage(IDC_FSPEED_SLIDER, TBM_SETPOS, TRUE, FILE_SPEED_DEFAULT_TIER);
            UpdateLabel();
            return TRUE;
        }
        return CDialog::OnCommand(wParam, lParam);
    }

    DECLARE_MESSAGE_MAP()
};

BEGIN_MESSAGE_MAP(CFileSpeedDlg, CDialog)
    ON_WM_HSCROLL()
END_MESSAGE_MAP()