using System.Text.Json;

namespace ScadaLink.CLI;

public class CliConfig
{
    public List<string> ContactPoints { get; set; } = new();
    public string? LdapServer { get; set; }
    public int LdapPort { get; set; } = 636;
    public bool LdapUseTls { get; set; } = true;
    public string DefaultFormat { get; set; } = "json";

    public static CliConfig Load()
    {
        var config = new CliConfig();

        // Load from config file
        var configPath = Path.Combine(
            Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
            ".scadalink", "config.json");
        if (File.Exists(configPath))
        {
            var json = File.ReadAllText(configPath);
            var fileConfig = JsonSerializer.Deserialize<CliConfigFile>(json,
                new JsonSerializerOptions { PropertyNameCaseInsensitive = true });
            if (fileConfig != null)
            {
                if (fileConfig.ContactPoints?.Count > 0) config.ContactPoints = fileConfig.ContactPoints;
                if (fileConfig.Ldap != null)
                {
                    config.LdapServer = fileConfig.Ldap.Server;
                    config.LdapPort = fileConfig.Ldap.Port;
                    config.LdapUseTls = fileConfig.Ldap.UseTls;
                }
                if (!string.IsNullOrEmpty(fileConfig.DefaultFormat)) config.DefaultFormat = fileConfig.DefaultFormat;
            }
        }

        // Override from environment variables
        var envContacts = Environment.GetEnvironmentVariable("SCADALINK_CONTACT_POINTS");
        if (!string.IsNullOrEmpty(envContacts))
            config.ContactPoints = envContacts.Split(',', StringSplitOptions.RemoveEmptyEntries).ToList();

        var envLdap = Environment.GetEnvironmentVariable("SCADALINK_LDAP_SERVER");
        if (!string.IsNullOrEmpty(envLdap)) config.LdapServer = envLdap;

        var envFormat = Environment.GetEnvironmentVariable("SCADALINK_FORMAT");
        if (!string.IsNullOrEmpty(envFormat)) config.DefaultFormat = envFormat;

        return config;
    }

    private class CliConfigFile
    {
        public List<string>? ContactPoints { get; set; }
        public LdapConfig? Ldap { get; set; }
        public string? DefaultFormat { get; set; }
    }

    private class LdapConfig
    {
        public string? Server { get; set; }
        public int Port { get; set; } = 636;
        public bool UseTls { get; set; } = true;
    }
}