using Cronos;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Data.Sqlite;
using Microsoft.Extensions.Caching.Memory;
using Mirea.Api.Dto.Requests;
using Mirea.Api.Dto.Requests.Configuration;
using Mirea.Api.Endpoint.Common.Attributes;
using Mirea.Api.Endpoint.Common.Exceptions;
using Mirea.Api.Endpoint.Common.Interfaces;
using Mirea.Api.Endpoint.Common.Services;
using Mirea.Api.Endpoint.Common.Settings;
using Mirea.Api.Endpoint.Configuration.General.Settings;
using Mirea.Api.Endpoint.Configuration.General.Validators;
using Mirea.Api.Security.Services;
using MySqlConnector;
using Npgsql;
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Net.Mail;
using System.Runtime.InteropServices;
using System.Security.Cryptography;

namespace Mirea.Api.Endpoint.Controllers.Configuration;

[ApiVersion("1.0")]
[ApiController]
[MaintenanceModeIgnore]
[ApiExplorerSettings(IgnoreApi = true)]
public class SetupController(
    ISetupToken setupToken,
    IMaintenanceModeNotConfigureService notConfigureService,
    IMemoryCache cache,
    PasswordHashService passwordHashService) : BaseController
{
    private const string CacheGeneralKey = "config_general";
    private const string CacheAdminKey = "config_admin";

    private GeneralConfig GeneralConfig
    {
        get => cache.Get<GeneralConfig>(CacheGeneralKey) ?? new GeneralConfig();
        set => cache.Set(CacheGeneralKey, value);
    }

    [HttpGet("GenerateToken")]
    [Localhost]
    public ActionResult<string> GenerateToken()
    {
        if (!notConfigureService.IsMaintenanceMode)
            throw new ControllerArgumentException(
                "The token cannot be generated because the server has been configured. " +
                $"If you need to restart the configuration, then delete the \"{GeneralConfig.FilePath}\" file and restart the application.");

        var token = new byte[32];
        RandomNumberGenerator.Create().GetBytes(token);
        setupToken.SetToken(token);

        return Ok(Convert.ToBase64String(token));
    }

    [HttpGet("IsConfigured")]
    public ActionResult<bool> IsConfigured() =>
        !notConfigureService.IsMaintenanceMode;

    [HttpGet("CheckToken")]
    public ActionResult<bool> CheckToken([FromQuery] string token)
    {
        if (!setupToken.MatchToken(Convert.FromBase64String(token))) return Unauthorized("The token is not valid");

        Response.Cookies.Append("AuthToken", token, new CookieOptions
        {
            Path = UrlHelper.GetSubPathWithoutFirstApiName + "api",
            Domain = HttpContext.GetCurrentDomain(),
            HttpOnly = true,
#if !DEBUG
            Secure = true
#endif
        });
        return Ok(true);
    }

    private ActionResult<bool> SetDatabase<TConnection, TException>(string connectionString, DbSettings.DatabaseEnum databaseType)
        where TConnection : class, IDbConnection, new()
        where TException : Exception
    {
        try
        {
            using var connection = new TConnection();
            connection.ConnectionString = connectionString;
            connection.Open();
            connection.Close();

            var general = GeneralConfig;
            general.DbSettings = new DbSettings
            {
                ConnectionStringSql = connectionString,
                TypeDatabase = databaseType
            };
            GeneralConfig = general;

            return Ok(true);
        }
        catch (TException ex)
        {
            throw new ControllerArgumentException($"Error when connecting: {ex.Message}");
        }
    }

    [HttpPost("SetPsql")]
    [TokenAuthentication]
    [BadRequestResponse]
    public ActionResult<bool> SetPsql([FromBody] DatabaseRequest request)
    {
        string connectionString = $"Host={request.Server}:{request.Port};Username={request.User};Database={request.Database}";
        if (request.Password != null)
            connectionString += $";Password={request.Password}";
        if (request.Ssl)
            connectionString += ";SSL Mode=Require;";

        return SetDatabase<NpgsqlConnection, NpgsqlException>(connectionString, DbSettings.DatabaseEnum.PostgresSql);
    }

    [HttpPost("SetMysql")]
    [TokenAuthentication]
    [BadRequestResponse]
    public ActionResult<bool> SetMysql([FromBody] DatabaseRequest request)
    {
        string connectionString = $"Server={request.Server}:{request.Port};Uid={request.User};Database={request.Database};";
        if (request.Password != null)
            connectionString += $"Pwd={request.Password};";
        if (request.Ssl)
            connectionString += "SslMode=Require;";

        return SetDatabase<MySqlConnection, MySqlException>(connectionString, DbSettings.DatabaseEnum.Mysql);
    }

    [HttpPost("SetSqlite")]
    [TokenAuthentication]
    public ActionResult<bool> SetSqlite([FromQuery] string? path)
    {
        if (string.IsNullOrEmpty(path)) path = "database";

        path = PathBuilder.Combine(path);

        if (!Directory.Exists(path))
        {
            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                Directory.CreateDirectory(path);
            else
                Directory.CreateDirectory(path, UnixFileMode.UserRead | UnixFileMode.UserWrite);
        }
        else
            throw new ControllerArgumentException("Such a folder exists. Enter a different name");

        string connectionString = $"Data Source={PathBuilder.Combine(path, "database.db3")}";

        return SetDatabase<SqliteConnection, SqliteException>(connectionString, DbSettings.DatabaseEnum.Sqlite);
    }

    [HttpPost("SetRedis")]
    [TokenAuthentication]
    [BadRequestResponse]
    public ActionResult<bool> SetRedis([FromBody] CacheRequest request)
    {
        string connectionString = $"{request.Server}:{request.Port},ssl=false";
        if (request.Password != null)
            connectionString += $",password={request.Password}";

        try
        {
            var redis = ConnectionMultiplexer.Connect(connectionString);
            redis.Close();

            var general = GeneralConfig;
            general.CacheSettings = new CacheSettings
            {
                ConnectionString = connectionString,
                TypeDatabase = CacheSettings.CacheEnum.Redis
            };
            GeneralConfig = general;

            return Ok(true);
        }
        catch (Exception ex)
        {
            throw new ControllerArgumentException("Error when connecting to Redis: " + ex.Message);
        }
    }

    [HttpPost("SetMemcached")]
    [TokenAuthentication]
    [BadRequestResponse]
    public ActionResult<bool> SetMemcached()
    {
        var general = GeneralConfig;
        general.CacheSettings = new CacheSettings
        {
            ConnectionString = null,
            TypeDatabase = CacheSettings.CacheEnum.Memcached
        };
        GeneralConfig = general;

        return Ok(true);
    }

    [HttpPost("CreateAdmin")]
    [TokenAuthentication]
    [BadRequestResponse]
    public ActionResult<string> CreateAdmin([FromBody] CreateUserRequest user)
    {
        if (PasswordHashService.HasPasswordInPolicySecurity(user.Password))
            throw new ControllerArgumentException("The password must be at least 8 characters long and contain at least one uppercase letter and one special character.");

        if (!MailAddress.TryCreate(user.Email, out _))
            throw new ControllerArgumentException("The email address is incorrect.");

        var (salt, hash) = passwordHashService.HashPassword(user.Password);

        var admin = new Admin
        {
            Username = user.Username,
            Email = user.Email,
            PasswordHash = hash,
            Salt = salt
        };

        cache.Set(CacheAdminKey, admin);
        return Ok(true);
    }

    [HttpPost("SetLogging")]
    [TokenAuthentication]
    [BadRequestResponse]
    public ActionResult<bool> SetLogging([FromBody] LoggingRequest? request = null)
    {
        var settings = (request == null) switch
        {
            true => new LogSettings
            {
                EnableLogToFile = true
            },
            false => new LogSettings
            {
                EnableLogToFile = request.EnableLogToFile,
                LogFileName = request.LogFileName,
                LogFilePath = request.LogFilePath
            }
        };

        if (settings.EnableLogToFile)
        {
            if (string.IsNullOrEmpty(settings.LogFileName))
                settings.LogFileName = "log-";

            if (string.IsNullOrEmpty(settings.LogFilePath))
                settings.LogFilePath = OperatingSystem.IsWindows() || PathBuilder.IsDefaultPath ?
                    PathBuilder.Combine("logs") :
                    "/var/log/mirea";
        }

        var general = GeneralConfig;
        general.LogSettings = settings;
        GeneralConfig = general;

        return true;
    }

    [HttpPost("SetEmail")]
    [TokenAuthentication]
    [BadRequestResponse]
    public ActionResult<bool> SetEmail([FromBody] EmailRequest? request = null)
    {
        var settings = (request == null) switch
        {
            true => new EmailSettings(),
            false => new EmailSettings
            {
                Server = request.Server,
                From = request.From,
                Password = request.Password,
                Port = request.Port,
                Ssl = request.Ssl,
                User = request.User
            }
        };

        var general = GeneralConfig;
        general.EmailSettings = settings;
        GeneralConfig = general;

        return true;
    }

    [HttpPost("SetSchedule")]
    [TokenAuthentication]
    [BadRequestResponse]
    public ActionResult<bool> SetSchedule([FromBody] ScheduleConfigurationRequest request)
    {
        var general = GeneralConfig;
        general.ScheduleSettings = new ScheduleSettings
        {
            // every 6 hours
            CronUpdateSchedule = request.CronUpdateSchedule ?? "0 */6 * * *",
            StartTerm = request.StartTerm,
            PairPeriod = new Dictionary<int, ScheduleSettings.PairPeriodTime>
            {
                {1, new ScheduleSettings.PairPeriodTime(new TimeOnly(9, 0, 0), new TimeOnly(10, 30, 0))},
                {2, new ScheduleSettings.PairPeriodTime(new TimeOnly(10, 40, 0), new TimeOnly(12, 10, 0))},
                {3, new ScheduleSettings.PairPeriodTime(new TimeOnly(12, 40, 0), new TimeOnly(14, 10, 0))},
                {4, new ScheduleSettings.PairPeriodTime(new TimeOnly(14, 20, 0), new TimeOnly(15, 50, 0))},
                {5, new ScheduleSettings.PairPeriodTime(new TimeOnly(16, 20, 0), new TimeOnly(17, 50, 0))},
                {6, new ScheduleSettings.PairPeriodTime(new TimeOnly(18, 0, 0), new TimeOnly(19, 30, 0))},
                {7, new ScheduleSettings.PairPeriodTime(new TimeOnly(19, 40, 0), new TimeOnly(21, 10, 0))},
            }
        };

        if (!CronExpression.TryParse(general.ScheduleSettings.CronUpdateSchedule, CronFormat.Standard, out _))
            throw new ControllerArgumentException("The Cron task could not be parsed. Check the format of the entered data.");

        GeneralConfig = general;

        return true;
    }

    [HttpPost("Submit")]
    [TokenAuthentication]
    [BadRequestResponse]
    public ActionResult<bool> Submit()
    {
        if (!new SettingsRequiredValidator(GeneralConfig).AreSettingsValid())
            throw new ControllerArgumentException("The necessary data has not been configured.");

        if (!cache.TryGetValue(CacheAdminKey, out Admin? admin) || admin == null)
            throw new ControllerArgumentException("The administrator's data was not set.");

        admin.SaveSetting();
        GeneralConfig.SaveSetting();

        return true;
    }
}