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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Mail;
namespace SendGridMail
{
public class Header : IHeader
{
private const string SendgridHeader = "X-Smtpapi";
private readonly HeaderSettingsNode _settings;
public Header()
{
_settings = new HeaderSettingsNode();
}
public IEnumerable<string> To
{
get
{
return _settings.GetArray("to");
}
}
public void AddSubVal(string tag, IEnumerable<string> substitutions)
{
var keys = new List<String> {"sub", tag};
_settings.AddArray(keys, substitutions);
}
public void AddTo(IEnumerable<string> addresses)
{
_settings.AddArray(new List<string> { "to" }, addresses);
}
public void AddUniqueIdentifier(IDictionary<string, string> identifiers)
{
foreach (var key in identifiers.Keys)
{
var keys = new List<String> {"unique_args", key};
var value = identifiers[key];
_settings.AddSetting(keys, value);
}
}
public void SetCategory(string category)
{
var keys = new List<String> {"category"};
_settings.AddSetting(keys, category);
}
public void Enable(string filter)
{
AddFilterSetting(filter, new List<string>(){ "enable" }, "1");
}
public void Disable(string filter)
{
AddFilterSetting(filter, new List<string>(){"enable"}, "0");
}
public void AddFilterSetting(string filter, IEnumerable<string> settings, string value)
{
var keys = new List<string>() {"filters", filter, "settings" }.Concat(settings).ToList();
_settings.AddSetting(keys, value);
}
public void AddHeader(MailMessage mime)
{
mime.Headers.Add(SendgridHeader, AsJson());
}
public String AsJson()
{
if(_settings.IsEmpty()) return "";
return _settings.ToJson();
}
internal class HeaderSettingsNode
{
private readonly Dictionary<String, HeaderSettingsNode> _branches;
private IEnumerable<String> _array;
private String _leaf;
public HeaderSettingsNode()
{
_branches = new Dictionary<string, HeaderSettingsNode>();
}
public void AddArray(List<String> keys, IEnumerable<String> value)
{
if (keys.Count == 0)
{
_array = value;
}
else
{
if (_leaf != null || _array != null)
throw new ArgumentException("Attempt to overwrite setting");
var key = keys.First();
if (!_branches.ContainsKey(key))
_branches[key] = new HeaderSettingsNode();
var remainingKeys = keys.Skip(1).ToList();
_branches[key].AddArray(remainingKeys, value);
}
}
public void AddSetting(List<String> keys, String value)
{
if (keys.Count == 0)
{
_leaf = value;
}
else
{
if(_leaf != null || _array != null)
throw new ArgumentException("Attempt to overwrite setting");
var key = keys.First();
if (!_branches.ContainsKey(key))
_branches[key] = new HeaderSettingsNode();
var remainingKeys = keys.Skip(1).ToList();
_branches[key].AddSetting(remainingKeys, value);
}
}
public String GetSetting(params String[] keys)
{
return GetSetting(keys.ToList());
}
public String GetSetting(List<String> keys)
{
if (keys.Count == 0)
return _leaf;
var key = keys.First();
if(!_branches.ContainsKey(key))
throw new ArgumentException("Bad key path!");
var remainingKeys = keys.Skip(1).ToList();
return _branches[key].GetSetting(remainingKeys);
}
public IEnumerable<String> GetArray(params String[] keys)
{
return GetArray(keys.ToList());
}
public IEnumerable<String> GetArray(List<String> keys)
{
if (keys.Count == 0)
return _array;
var key = keys.First();
if (!_branches.ContainsKey(key))
throw new ArgumentException("Bad key path!");
var remainingKeys = keys.Skip(1).ToList();
return _branches[key].GetArray(remainingKeys);
}
public String GetLeaf()
{
return _leaf;
}
public String ToJson()
{
if (_branches.Count > 0)
return "{" + String.Join(",", _branches.Keys.Select(k => Utils.Serialize(k) + " : " + _branches[k].ToJson())) + "}";
if (_leaf != null)
return Utils.Serialize(_leaf);
if (_array != null)
return "[" + String.Join(", ", _array.Select(i => Utils.Serialize(i))) + "]";
return "{}";
}
public bool IsEmpty()
{
if (_leaf != null) return false;
return _branches == null || _branches.Keys.Count == 0;
}
}
}
}
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