// 备份目标选择对话框(备份/恢复共用):
// · 两个大按钮:保存到云端 / 保存到本地文件(恢复语境=从云端恢复 / 从本地备份文件恢复)
// · "记住我的选择,以后不再提示"复选框:勾选后写 shezhi\备份目标.config.xml,
//   之后点备份/恢复不再弹框,直接走记住的选项
// · 云端项在未登录会员时禁用(灰字提示需先登录)
using System;
using System.IO;
using System.Text;
using System.Windows.Forms;

namespace 成套报价软件
{
    public enum 备份目标 { 未定, 云端, 本地文件 }

    internal static class 备份目标选择
    {
        private const string 配置文件 = @"shezhi\备份目标.config.xml";

        /// <summary>读记住的选择(0=未记住,1=云端,2=本地)。</summary>
        public static int 读记住的选择()
        {
            try
            {
                string p = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, 配置文件);
                if (!File.Exists(p)) return 0;
                var doc = new System.Xml.XmlDocument();
                doc.Load(p);
                var node = doc.SelectSingleNode("//备份目标");
                string v = node != null && node.Attributes["值"] != null ? node.Attributes["值"].Value : "";
                if (v == "云端") return 1;
                if (v == "本地") return 2;
            }
            catch { }
            return 0;
        }

        public static void 写记住的选择(备份目标 t)
        {
            try
            {
                string p = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, 配置文件);
                Directory.CreateDirectory(Path.GetDirectoryName(p));
                string v = t == 备份目标.云端 ? "云端" : "本地";
                File.WriteAllText(p,
                    "<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<备份目标 值=\"" + v + "\" />\r\n",
                    new UTF8Encoding(true));
            }
            catch { }
        }

        /// <summary>
        /// 弹目标选择框。isRestore=false 备份语境(保存到云端/保存到本地文件);
        /// true 恢复语境(从云端恢复/从本地备份文件恢复)。返回 未定=用户取消。
        /// 用户勾"记住"后写配置,之后调用方不再弹框直接走记住的值。
        /// </summary>
        public static 备份目标 询问(bool isRestore)
        {
            int 记住 = 读记住的选择();
            if (记住 == 1) return 备份目标.云端;
            if (记住 == 2) return 备份目标.本地文件;

            bool 云端可 = !string.IsNullOrWhiteSpace(MainForm.当前登录手机号);
            备份目标 结果 = 备份目标.未定;
            bool 记住勾 = false;

            using (var dlg = new Form
            {
                Text = isRestore ? "从哪里恢复?" : "备份到哪里?",
                StartPosition = FormStartPosition.CenterParent,
                FormBorderStyle = FormBorderStyle.FixedDialog,
                MaximizeBox = false,
                MinimizeBox = false,
                ClientSize = new System.Drawing.Size(400, 云端可 ? 200 : 224),
                Font = new System.Drawing.Font("宋体", 9F),
            })
            {
                string 动词 = isRestore ? "从云端恢复" : "保存到云端";
                string 动词2 = isRestore ? "从本地备份文件恢复" : "保存到本地文件";

                var btn云 = new Button
                {
                    Text = 云端可 ? 动词 : 动词 + "(需先登录会员)",
                    Location = new System.Drawing.Point(40, 24),
                    Size = new System.Drawing.Size(320, 44),
                    Enabled = 云端可,
                };
                btn云.Click += (s, e) => { 结果 = 备份目标.云端; dlg.DialogResult = DialogResult.OK; dlg.Close(); };
                dlg.Controls.Add(btn云);

                var btn本地 = new Button
                {
                    Text = 动词2,
                    Location = new System.Drawing.Point(40, 78),
                    Size = new System.Drawing.Size(320, 44),
                };
                btn本地.Click += (s, e) => { 结果 = 备份目标.本地文件; dlg.DialogResult = DialogResult.OK; dlg.Close(); };
                dlg.Controls.Add(btn本地);

                if (!云端可)
                {
                    dlg.Controls.Add(new Label
                    {
                        Text = "提示:登录会员后可使用云端备份/恢复",
                        Location = new System.Drawing.Point(40, 128),
                        Size = new System.Drawing.Size(300, 18),
                        ForeColor = System.Drawing.Color.Firebrick,
                    });
                }

                var chk = new CheckBox
                {
                    Text = "记住我的选择,以后不再提示",
                    Location = new System.Drawing.Point(40, 云端可 ? 132 : 158),
                    Size = new System.Drawing.Size(280, 24),
                };
                chk.CheckedChanged += (s, e) => { 记住勾 = chk.Checked; };
                dlg.Controls.Add(chk);

                dlg.ShowDialog(Form.ActiveForm);

                if (dlg.DialogResult == DialogResult.OK && 记住勾 && 结果 != 备份目标.未定)
                    写记住的选择(结果);
                return 结果;
            }
        }
    }
}