using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace HanvonF710XAttendanceService
{
    internal static class TemplateParser
    {
        // Mirrors UTS MainForm.removeReturn(...)
        public static bool TryExtractTemplatePayloadFromGetEmployeeResponse(string getEmployeeResponse, out string payload)
        {
            payload = null;
            if (string.IsNullOrWhiteSpace(getEmployeeResponse))
            {
                return false;
            }

            string[] splitData = getEmployeeResponse.Split('(');
            for (int i = 0; i < splitData.Length; i++)
            {
                string s = splitData[i];
                if (!s.Contains("Return"))
                {
                    string updatedData = s.Replace("result=\"success\" ", "");
                    string[] updatedResult = updatedData.Split(')');
                    payload = updatedResult.Length > 0 ? updatedResult[0] : null;
                    payload = string.IsNullOrWhiteSpace(payload) ? null : payload;
                    return payload != null;
                }
            }

            return false;
        }

        // Mirrors UTS MainForm.SetEmployeeInfo(...) string transformation
        public static bool TryBuildSetEmployeeCommand(string templatePayloadOrGetEmployeeResponse, out string setEmployeeCommand)
        {
            setEmployeeCommand = null;
            if (string.IsNullOrWhiteSpace(templatePayloadOrGetEmployeeResponse))
            {
                return false;
            }

            string[] splitData = templatePayloadOrGetEmployeeResponse.Split('(');
            for (int i = 0; i < splitData.Length; i++)
            {
                string s = splitData[i];
                if (!s.Contains("Return"))
                {
                    string updatedData = s.Replace("result=\"success\" ", "");
                    string[] updatedResult = updatedData.Split(')');
                    var inner = updatedResult.Length > 0 ? updatedResult[0] : null;
                    if (!string.IsNullOrWhiteSpace(inner))
                    {
                        setEmployeeCommand = "SetEmployee(" + inner + ")";
                        return true;
                    }
                }
            }

            return false;
        }

        public static List<string> ParseEmployeeIdsFromGetEmployeeIdResponse(string getEmployeeIdResponse)
        {
            if (string.IsNullOrWhiteSpace(getEmployeeIdResponse))
            {
                return new List<string>();
            }

            // Typical responses contain many occurrences like: id="6286"
            var matches = Regex.Matches(getEmployeeIdResponse, "\\bid=\"([^\"]+)\"");
            var ids = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
            foreach (Match m in matches)
            {
                if (!m.Success || m.Groups.Count < 2)
                {
                    continue;
                }

                var id = m.Groups[1].Value?.Trim();
                if (string.IsNullOrWhiteSpace(id))
                {
                    continue;
                }

                ids.Add(id);
            }

            return ids.OrderBy(x => x, StringComparer.OrdinalIgnoreCase).ToList();
        }
    }
}