using System.IO;
using System.Text.RegularExpressions;

namespace Housing.Services;

public sealed class LoginSettings
{
    private const string DefaultProcedure = "dbo.CheckOperator";

    public string Procedure { get; set; } = DefaultProcedure;
    public bool OfflinePreview { get; set; }

    public static LoginSettings Load(string filePath)
    {
        if (!File.Exists(filePath))
        {
            throw new FileNotFoundException("Database.ini file was not found.", filePath);
        }

        var values = IniFile.LoadSection(filePath, "Login");
        return new LoginSettings
        {
            Procedure = GetString(values, "Procedure", DefaultProcedure),
            OfflinePreview = GetBool(values, "OfflinePreview", false)
        };
    }

    public string GetProcedureName()
    {
        var parts = Procedure
            .Split('.', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries)
            .ToArray();

        if (parts.Length is 0 or > 3 || parts.Any(part => !IsSqlIdentifier(part)))
        {
            throw new InvalidOperationException("Check Database.ini [Login] Procedure value.");
        }

        return string.Join(".", parts);
    }

    private static string GetString(Dictionary<string, string> values, string key, string defaultValue)
    {
        return values.TryGetValue(key, out var value) && !string.IsNullOrWhiteSpace(value)
            ? value.Trim()
            : defaultValue;
    }

    private static bool GetBool(Dictionary<string, string> values, string key, bool defaultValue)
    {
        if (!values.TryGetValue(key, out var value) || string.IsNullOrWhiteSpace(value))
        {
            return defaultValue;
        }

        return value.Trim().ToUpperInvariant() switch
        {
            "1" or "TRUE" or "YES" or "ON" => true,
            "0" or "FALSE" or "NO" or "OFF" => false,
            _ => defaultValue
        };
    }

    private static bool IsSqlIdentifier(string value)
    {
        return Regex.IsMatch(value, @"^[A-Za-z_][A-Za-z0-9_]*$");
    }
}