using System.Text.Json;
using System.Text.RegularExpressions;

namespace perubahan;

public static partial class APIHandler
{
    public static void Handle(IApplicationBuilder App)
    {
        App
        //============MISC=================
        .Map("/updatecache",cache=>{
            cache.Run(async runner=>{
                _ = await UpdateCache();
                await WriteJsonResponse(runner,StatusCodes.Status200OK,"Cache Updated.");
            });
        })
        //===========UNITS=================
        .Map("/getunits", units =>{
            units.Run(async runner=>{
                if (!await RequestValidated(runner,2)) return;
                await WriteJsonResponse(runner,StatusCodes.Status200OK,"Success",Deployments);
            });
        })
        .Map("/chunit", unit =>{
            unit.Run(async runner=>{
                if (!await RequestValidated(runner, 2, "POST", true)) return;
                if(await TryGetBodyJsonAsync(runner, ["deplid", "unitkerja"], CTS.Token) is Dictionary<string, JsonElement> InElement)
                {
                    Deployment CorrectDeployment = new(
                        InElement["deplid"].GetInt16(),
                        InElement["unitkerja"].GetString() ?? ""
                    );
                    if (CorrectDeployment.UnitKerja.Length < 1)
                    {
                        await WriteJsonResponse(runner,StatusCodes.Status400BadRequest, "Unit Kerja can't be empty string.");
                        return;
                    }
                    int i = Deployments.FindIndex(depl=>depl.DeplID == CorrectDeployment.DeplID);
                    if(i<0) 
                    {
                        await WriteJsonResponse(runner,StatusCodes.Status404NotFound,"Deployment ID not found.");
                        return;     
                    }
                    _ = await RunNonQueryAsync(CS,"UPDATE deployment SET unitkerja = @uk WHERE deplid = @id",Comm=>{
                        Comm.Parameters.AddWithValue("@id", CorrectDeployment.DeplID);
                        Comm.Parameters.AddWithValue("@uk", CorrectDeployment.UnitKerja);
                    },CTS.Token);
                    Deployments[i] = CorrectDeployment;
                    await WriteJsonResponse(runner,StatusCodes.Status202Accepted,"Data updated.",Deployments[i]);
                }
            });
        })
        .Map("/addunit", unit =>{
            unit.Run(async runner=>{
                if (!await RequestValidated(runner, 2, "POST", true)) return;
                if(await TryGetBodyJsonAsync(runner, ["unitkerja"], CTS.Token) is Dictionary<string, JsonElement> InElement)
                {
                    string UnitKerja = InElement["unitkerja"].GetString() ?? "";
                    if (UnitKerja.Length < 1)
                    {
                        await WriteJsonResponse(runner,StatusCodes.Status400BadRequest, "Unit Kerja can't be empty string.");
                        return;
                    }
                    short DeplID = (short)await RunScalarAsync(CS,"INSERT INTO deployment OUTPUT INSERTED.deplid VALUES (@uk)",Comm=>{
                        Comm.Parameters.AddWithValue("@uk", UnitKerja);
                    },CTS.Token);
                    Deployment Inserted = new(DeplID,UnitKerja);
                    Deployments.Add(Inserted);
                    // EventsMarker.CacheUpdates = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds().ToString("X");
                    await WriteJsonResponse(runner,StatusCodes.Status201Created,"Data Created.",Inserted);
                }
            });
        })
        //============AGENTS==============
        .Map("/getagents", agents=>{
            agents.Run(async runner=>{
                if (!await RequestValidated(runner,2)) return;
                await WriteJsonResponse(runner,StatusCodes.Status200OK,"Success",Agents);
            });
        })
        .Map("/addagent", agent=>{
            agent.Run(async runner=>{
                if (!await RequestValidated(runner, 1, "POST", true)) return;
                if (await TryGetBodyJsonAsync(runner, ["agentid", "name", "jabatan", "deplid", "skangkat", "tmt", "skper", "tgper", "vision", "mission", "photo", "createuser", "uname", "pass", "level"], CTS.Token) is Dictionary<string, JsonElement> InElement)
                {
                    string AgentID = InElement["agentid"].GetString() ?? string.Empty;
                    string Name = InElement["nama"].GetString() ?? string.Empty;
                    string Jabatan = InElement["jabatan"].GetString() ?? string.Empty;
                    short DeploymentID = InElement["deplid"].GetInt16();
                    string SKAngkat = InElement["skangkat"].GetString() ?? string.Empty;
                    DateTime TMT = DateTime.Parse(InElement["tmt"].GetString() ?? "1970-01-01");
                    string SKPer = InElement["skper"].GetString() ?? string.Empty;
                    DateTime? TGPer = InElement["tgper"].GetString()?.Length > 0 ? DateTime.Parse(InElement["tgper"].GetString()!) : null;
                    string Vision = InElement["vision"].GetString() ?? "-";
                    string Mission = InElement["mission"].GetString() ?? "-";
                    string Photo = InElement["photo"].GetString() ?? string.Empty;
                    string PhotoURL = string.Empty;
                    bool CreateUser = InElement["createuser"].GetBoolean();
                    string UName = InElement["uname"].GetString() ?? string.Empty;
                    string PlainPass = InElement["pass"].GetString() ?? string.Empty;
                    byte Level = InElement["level"].GetByte();
                    Match PhotoMatch = Base64Regex().Match(Photo.ToLower());
                    if (AgentID.Equals(string.Empty) ||
                        Name.Equals(string.Empty) ||
                        Jabatan.Equals(string.Empty) ||
                        DeploymentID.Equals(0) ||
                        SKAngkat.Equals(string.Empty) ||
                        TMT.Equals(DateOnly.Parse("1970-01-01")) ||
                        (!SKPer.Equals(string.Empty) && TGPer is null) ||
                        (CreateUser && UName.Equals(string.Empty)) ||
                        (CreateUser && PlainPass.Equals(string.Empty)) ||
                        (!Photo.Equals(string.Empty) && !PhotoMatch.Success) ||
                        (await RequestValidated(runner, Level, "POST")))
                    {
                        await WriteJsonResponse(runner, StatusCodes.Status400BadRequest, "One or more input(s) are not acceptable, in an unsupported format, or an attempt to create user account of a higher level than the creator is made.");
                        return;
                    }
                    if (!Photo.Equals(string.Empty))
                    {
                        string Format = PhotoMatch.Groups["format"].Value.ToLowerInvariant();
                        string Data = PhotoMatch.Groups["data"].Value;
                        byte[] ImageBytes = Convert.FromBase64String(Data);
                        uint CRC32Hash = Crc32.Compute(ImageBytes);
                        string PhotoFileName = $"{CRC32Hash:X8}.{(Format == "jpeg" ? "jpg" : Format)}";
                        string PhotoPath = Path.Combine(AppContext.BaseDirectory, "/wwwroot/assets/images/uploads", PhotoFileName);
                        if (!File.Exists(PhotoPath)) await File.WriteAllBytesAsync(PhotoPath, ImageBytes, CTS.Token);
                        PhotoURL = Path.Combine("/assets/images/uploads", PhotoFileName);
                    }
                    await RunTransactionAsync(CS, async (Conn, Trans) =>
                        {
                            using (SqlCommand CreateAgent = Conn.CreateCommand())
                            {
                                CreateAgent.Transaction = Trans;
                                CreateAgent.CommandText = "INSERT INTO agents VALUE(@agid, @nama, @jabt, @deid, @skng, @tmt, @skpr, @tmpr, @visi, @misi, @poto)";
                                CreateAgent.Parameters.AddWithValue("@agid", AgentID);
                                CreateAgent.Parameters.AddWithValue("@nama", Name);
                                CreateAgent.Parameters.AddWithValue("@jabt", Jabatan);
                                CreateAgent.Parameters.AddWithValue("@deid", DeploymentID);
                                CreateAgent.Parameters.AddWithValue("@skng", SKAngkat);
                                CreateAgent.Parameters.AddWithValue("@tmt", TMT);
                                CreateAgent.Parameters.AddWithValue("@skpr", SKPer.Equals(string.Empty) ? DBNull.Value : SKPer);
                                CreateAgent.Parameters.AddWithValue("@tmpr", SKPer.Equals(string.Empty) ? DBNull.Value : TGPer);
                                CreateAgent.Parameters.AddWithValue("@visi", Vision);
                                CreateAgent.Parameters.AddWithValue("@misi", Mission);
                                CreateAgent.Parameters.AddWithValue("@poto", PhotoURL.Equals(string.Empty) ? DBNull.Value : PhotoURL);
                                _ = await CreateAgent.ExecuteNonQueryAsync();
                            }
                            if (CreateUser)
                            {
                                string HashedPass = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(PlainPass)));
                                using (SqlCommand CreateUser = Conn.CreateCommand())
                                {
                                    CreateUser.Transaction = Trans;
                                    CreateUser.CommandText = "INSERT INTO useraccounts VALUES(@unam, @pass, @agid, @levl, 1)";
                                    CreateUser.Parameters.AddWithValue("@unam", UName);
                                    CreateUser.Parameters.AddWithValue("@pass", HashedPass);
                                    CreateUser.Parameters.AddWithValue("@agid", AgentID);
                                    CreateUser.Parameters.AddWithValue("@levl", Level);
                                    _ = await CreateUser.ExecuteNonQueryAsync();
                                }
                            }
                        }, CTS.Token
                    );
                    string OutMessage = CreateUser ? "New Agent and respective User Account created" : "New Agent created. User account creation is possible.";
                    await WriteJsonResponse(runner, StatusCodes.Status201Created, OutMessage);
                }
            });
        })
        ;
    }

}