// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.

using System;
using System.Collections.Generic;
using System.Text.Json;
using Regorus.Internal;

#nullable enable
namespace Regorus
{
    /// <summary>
    /// Provides static methods for managing the global resource schema registry.
    /// Resource schemas define the structure and validation rules for Azure Policy resources.
    /// </summary>
    public static unsafe class SchemaRegistry
    {
        /// <summary>
        /// Register a resource schema from JSON with a given name.
        /// </summary>
        /// <param name="name">Name to register the schema under</param>
        /// <param name="schemaJson">JSON string representing the schema</param>
        /// <exception cref="Exception">Thrown when schema registration fails</exception>
        public static void RegisterResource(string name, string schemaJson)
        {
            Utf8Marshaller.WithUtf8(name, namePtr =>
            {
                Utf8Marshaller.WithUtf8(schemaJson, schemaPtr =>
                {
                    unsafe
                    {
                        ResultHelpers.GetStringResult(Internal.API.regorus_resource_schema_register((byte*)namePtr, (byte*)schemaPtr));
                    }
                });
            });
        }

        /// <summary>
        /// Check if a resource schema with the given name exists.
        /// </summary>
        /// <param name="name">Name of the schema to check</param>
        /// <returns>True if the schema exists, false otherwise</returns>
        /// <exception cref="Exception">Thrown when the operation fails</exception>
        public static bool ContainsResource(string name)
        {
            return Utf8Marshaller.WithUtf8(name, namePtr =>
            {
                unsafe
                {
                    var result = Internal.API.regorus_resource_schema_contains((byte*)namePtr);
                    return ResultHelpers.GetBoolResult(result);
                }
            });
        }

        /// <summary>
        /// Get the number of registered resource schemas.
        /// </summary>
        /// <returns>The number of registered resource schemas</returns>
        /// <exception cref="Exception">Thrown when the operation fails</exception>
        public static long ResourceCount
        {
            get
            {
                var result = Internal.API.regorus_resource_schema_len();
                return ResultHelpers.GetIntResult(result);
            }
        }

        /// <summary>
        /// Check if the resource schema registry is empty.
        /// </summary>
        /// <returns>True if the registry is empty, false otherwise</returns>
        /// <exception cref="Exception">Thrown when the operation fails</exception>
        public static bool IsResourceRegistryEmpty
        {
            get
            {
                var result = Internal.API.regorus_resource_schema_is_empty();
                return ResultHelpers.GetBoolResult(result);
            }
        }

        /// <summary>
        /// List all registered resource schema names.
        /// </summary>
        /// <returns>JSON array of schema names</returns>
        /// <exception cref="Exception">Thrown when the operation fails</exception>
        public static string ListResourceNames()
        {
            return ResultHelpers.GetStringResult(Internal.API.regorus_resource_schema_list_names()) ?? "[]";
        }

        /// <summary>
        /// List all registered resource schema names as managed strings.
        /// </summary>
        public static IReadOnlyList<string> GetResourceNames()
        {
            var json = ListResourceNames();
            return JsonSerializer.Deserialize<string[]>(json) ?? Array.Empty<string>();
        }

        /// <summary>
        /// Remove a resource schema by name.
        /// </summary>
        /// <param name="name">Name of the schema to remove</param>
        /// <returns>True if the schema was removed, false if it wasn't found</returns>
        /// <exception cref="Exception">Thrown when the operation fails</exception>
        public static bool RemoveResource(string name)
        {
            return Utf8Marshaller.WithUtf8(name, namePtr =>
            {
                unsafe
                {
                    var result = Internal.API.regorus_resource_schema_remove((byte*)namePtr);
                    return ResultHelpers.GetBoolResult(result);
                }
            });
        }

        /// <summary>
        /// Clear all resource schemas from the registry.
        /// </summary>
        /// <exception cref="Exception">Thrown when the operation fails</exception>
        public static void ClearResources()
        {
            ResultHelpers.GetStringResult(Internal.API.regorus_resource_schema_clear());
        }

        /// <summary>
        /// Register an effect schema from JSON with a given name.
        /// </summary>
        /// <param name="name">Name to register the schema under</param>
        /// <param name="schemaJson">JSON string representing the schema</param>
        /// <exception cref="Exception">Thrown when schema registration fails</exception>
        public static void RegisterEffect(string name, string schemaJson)
        {
            Utf8Marshaller.WithUtf8(name, namePtr =>
            {
                Utf8Marshaller.WithUtf8(schemaJson, schemaPtr =>
                {
                    unsafe
                    {
                        ResultHelpers.GetStringResult(Internal.API.regorus_effect_schema_register((byte*)namePtr, (byte*)schemaPtr));
                    }
                });
            });
        }

        /// <summary>
        /// Check if an effect schema with the given name exists.
        /// </summary>
        /// <param name="name">Name of the schema to check</param>
        /// <returns>True if the schema exists, false otherwise</returns>
        /// <exception cref="Exception">Thrown when the operation fails</exception>
        public static bool ContainsEffect(string name)
        {
            return Utf8Marshaller.WithUtf8(name, namePtr =>
            {
                unsafe
                {
                    var result = Internal.API.regorus_effect_schema_contains((byte*)namePtr);
                    return ResultHelpers.GetBoolResult(result);
                }
            });
        }

        /// <summary>
        /// Get the number of registered effect schemas.
        /// </summary>
        /// <returns>The number of registered effect schemas</returns>
        /// <exception cref="Exception">Thrown when the operation fails</exception>
        public static long EffectCount
        {
            get
            {
                var result = Internal.API.regorus_effect_schema_len();
                return ResultHelpers.GetIntResult(result);
            }
        }

        /// <summary>
        /// Check if the effect schema registry is empty.
        /// </summary>
        /// <returns>True if the registry is empty, false otherwise</returns>
        /// <exception cref="Exception">Thrown when the operation fails</exception>
        public static bool IsEffectRegistryEmpty
        {
            get
            {
                var result = Internal.API.regorus_effect_schema_is_empty();
                return ResultHelpers.GetBoolResult(result);
            }
        }

        /// <summary>
        /// List all registered effect schema names.
        /// </summary>
        /// <returns>JSON array of schema names</returns>
        /// <exception cref="Exception">Thrown when the operation fails</exception>
        public static string ListEffectNames()
        {
            return ResultHelpers.GetStringResult(Internal.API.regorus_effect_schema_list_names()) ?? "[]";
        }

        /// <summary>
        /// List all registered effect schema names as managed strings.
        /// </summary>
        public static IReadOnlyList<string> GetEffectNames()
        {
            var json = ListEffectNames();
            return JsonSerializer.Deserialize<string[]>(json) ?? Array.Empty<string>();
        }

        /// <summary>
        /// Remove an effect schema by name.
        /// </summary>
        /// <param name="name">Name of the schema to remove</param>
        /// <returns>True if the schema was removed, false if it wasn't found</returns>
        /// <exception cref="Exception">Thrown when the operation fails</exception>
        public static bool RemoveEffect(string name)
        {
            return Utf8Marshaller.WithUtf8(name, namePtr =>
            {
                unsafe
                {
                    var result = Internal.API.regorus_effect_schema_remove((byte*)namePtr);
                    return ResultHelpers.GetBoolResult(result);
                }
            });
        }

        /// <summary>
        /// Clear all effect schemas from the registry.
        /// </summary>
        /// <exception cref="Exception">Thrown when the operation fails</exception>
        public static void ClearEffects()
        {
            ResultHelpers.GetStringResult(Internal.API.regorus_effect_schema_clear());
        }
    }
}