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using System.Security.Cryptography.X509Certificates;

using Npgsql;

using NpgsqlRest.Defaults;

namespace NpgsqlRest;

public class NpgsqlRestMetadataEntry

{

internal NpgsqlRestMetadataEntry(

Routine routine,

RoutineEndpoint endpoint,

IRoutineSourceParameterFormatter formatter,

string key)

{

Routine = routine;

Endpoint = endpoint;

Formatter = formatter;

Key = key;

}

public Routine Routine { get; }

public RoutineEndpoint Endpoint { get; }

public IRoutineSourceParameterFormatter Formatter { get; }

public string Key { get; }

}

public class NpgsqlRestMetadata

{

internal NpgsqlRestMetadata(

Dictionary<string, NpgsqlRestMetadataEntry> entries,

Dictionary<string, NpgsqlRestMetadataEntry> overloads)

{

Entries = entries;

Overloads = overloads;

}

public Dictionary<string, NpgsqlRestMetadataEntry> Entries { get; }

public Dictionary<string, NpgsqlRestMetadataEntry> Overloads { get; }

}

public static class NpgsqlRestMetadataBuilder

{

public const int MaxKeyLength = 2056;

public const int MaxPathLength = 2048;

public static NpgsqlRestMetadata Build(NpgsqlRestOptions options, ILogger? logger, IApplicationBuilder? builder)

{

Dictionary<string, NpgsqlRestMetadataEntry> lookup = [];

Dictionary<string, NpgsqlRestMetadataEntry> overloads = [];

var hasLogin = false;

if (builder is not null)

{

foreach (var handler in options.EndpointCreateHandlers)

{

handler.Setup(builder, logger, options);

}

}

options.SourcesCreated(options.RoutineSources);

CommentsMode optionsCommentsMode = options.CommentsMode;

foreach (var source in options.RoutineSources)

{

if (source.CommentsMode.HasValue)

{

options.CommentsMode = source.CommentsMode.Value;

}

else

{

options.CommentsMode = optionsCommentsMode;

}

foreach (var (routine, formatter) in source.Read(options, builder?.ApplicationServices))

{

RoutineEndpoint endpoint = DefaultEndpoint.Create(routine, options, logger)!;

if (endpoint is null)

{

continue;

}

if (options.EndpointCreated is not null)

{

endpoint = options.EndpointCreated(routine, endpoint)!;

}

if (endpoint is null)

{

continue;

}

if (endpoint.Url.Length > MaxPathLength)

{

throw new ArgumentException($"URL path for URL {endpoint.Url}, routine {routine.Name} length exceeds {MaxPathLength} characters.");

}

var method = endpoint.Method.ToString();

if (endpoint.HasBodyParameter is true && endpoint.RequestParamType == RequestParamType.BodyJson)

{

endpoint.RequestParamType = RequestParamType.QueryString;

logger?.EndpointTypeChanged(method, endpoint.Url, endpoint!.BodyParameterName ?? "");

}

var key = string.Concat(method, endpoint?.Url);

var value = new NpgsqlRestMetadataEntry(routine, endpoint!, formatter, key);

if (lookup.TryGetValue(key, out var existing))

{

overloads[string.Concat(key, existing.Routine.ParamCount)] = existing;

}

lookup[key] = value;

if (builder is not null)

{

foreach (var handler in options.EndpointCreateHandlers)

{

handler.Handle(routine, endpoint!);

}

}

if (options.LogEndpointCreatedInfo)

{

logger?.EndpointCreated(method, endpoint!.Url);

}

if (endpoint?.Login is true)

{

if (hasLogin is false)

{

hasLogin = true;

}

if (routine.IsVoid is true || routine.ReturnsUnnamedSet is true)

{

throw new ArgumentException($"{routine.Type.ToString().ToLowerInvariant()} {routine.Schema}.{routine.Name} is marked as login and it can't be void or returning unnamed data sets.");

}

}

}

}

if (hasLogin is true)

{

if (options.AuthenticationOptions.DefaultAuthenticationType is null)

{

string db = new NpgsqlConnectionStringBuilder(options.ConnectionString).Database ?? "NpgsqlRest";

options.AuthenticationOptions.DefaultAuthenticationType = db;

logger?.SetDefaultAuthenticationType(db);

}

}

if (options.EndpointsCreated is not null)

{

options.EndpointsCreated(lookup.Values.Select(x => (x.Routine, x.Endpoint)).ToArray());

}

if (builder is not null)

{

(Routine routine, RoutineEndpoint endpoint)[]? array = null;

foreach (var handler in options.EndpointCreateHandlers)

{

array ??= lookup.Values.Select(x => (x.Routine, x.Endpoint)).ToArray();

handler.Cleanup(array);

handler.Cleanup();

}

}

return new NpgsqlRestMetadata(lookup, overloads);

}

}