// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System.Collections.Generic;
using Microsoft.Tye.ConfigModel;
using YamlDotNet.RepresentationModel;

namespace Tye.Serialization
{
    public static class ConfigServiceParser
    {
        public static void HandleServiceMapping(YamlSequenceNode yamlSequenceNode, List<ConfigService> services)
        {
            foreach (var child in yamlSequenceNode.Children)
            {
                YamlParser.ThrowIfNotYamlMapping(child);
                var service = new ConfigService();
                HandleServiceNameMapping((YamlMappingNode)child, service);
                services.Add(service);
            }
        }

        private static void HandleServiceNameMapping(YamlMappingNode yamlMappingNode, ConfigService service)
        {
            foreach (var child in yamlMappingNode!.Children)
            {
                var key = YamlParser.GetScalarValue(child.Key);

                switch (key)
                {
                    case "name":
                        service.Name = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "external":
                        if (!bool.TryParse(YamlParser.GetScalarValue(key, child.Value), out var external))
                        {
                            throw new TyeYamlException(child.Value.Start, CoreStrings.FormatMustBeABoolean(key));
                        }
                        service.External = external;
                        break;
                    case "image":
                        service.Image = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "project":
                        service.Project = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "buildProperties":
                        if (child.Value.NodeType != YamlNodeType.Sequence)
                        {
                            throw new TyeYamlException(child.Value.Start, CoreStrings.FormatExpectedYamlSequence(key));
                        }
                        HandleBuildProperties((child.Value as YamlSequenceNode)!, service.BuildProperties);
                        break;
                    case "include":
                        service.Include = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "repository":
                        service.Repository = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "build":
                        if (!bool.TryParse(YamlParser.GetScalarValue(key, child.Value), out var build))
                        {
                            throw new TyeYamlException(child.Value.Start, CoreStrings.FormatMustBeABoolean(key));
                        }
                        service.Build = build;
                        break;
                    case "executable":
                        service.Executable = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "workingDirectory":
                        service.WorkingDirectory = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "args":
                        service.Args = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "replicas":
                        if (!int.TryParse(YamlParser.GetScalarValue(key, child.Value), out var replicas))
                        {
                            throw new TyeYamlException(child.Value.Start, CoreStrings.FormatMustBeAnInteger(key));
                        }

                        if (replicas < 0)
                        {
                            throw new TyeYamlException(child.Value.Start, CoreStrings.FormatMustBePositive(key));
                        }

                        service.Replicas = replicas;
                        break;
                    case "bindings":
                        if (child.Value.NodeType != YamlNodeType.Sequence)
                        {
                            throw new TyeYamlException(child.Value.Start, CoreStrings.FormatExpectedYamlSequence(key));
                        }

                        HandleServiceBindings((child.Value as YamlSequenceNode)!, service.Bindings);
                        break;
                    case "volumes":
                        if (child.Value.NodeType != YamlNodeType.Sequence)
                        {
                            throw new TyeYamlException(child.Value.Start, CoreStrings.FormatExpectedYamlSequence(key));
                        }

                        HandleServiceVolumes((child.Value as YamlSequenceNode)!, service.Volumes);
                        break;
                    case "env":
                    case "configuration":
                        if (child.Value.NodeType != YamlNodeType.Sequence)
                        {
                            throw new TyeYamlException(child.Value.Start, CoreStrings.FormatExpectedYamlSequence(key));
                        }
                        HandleServiceConfiguration((child.Value as YamlSequenceNode)!, service.Configuration);
                        break;
                    default:
                        throw new TyeYamlException(child.Key.Start, CoreStrings.FormatUnrecognizedKey(key));
                }
            }
        }

        private static void HandleServiceBindings(YamlSequenceNode yamlSequenceNode, List<ConfigServiceBinding> bindings)
        {
            foreach (var child in yamlSequenceNode.Children)
            {
                YamlParser.ThrowIfNotYamlMapping(child);
                var binding = new ConfigServiceBinding();
                HandleServiceBindingNameMapping((YamlMappingNode)child, binding);
                bindings.Add(binding);
            }
        }

        private static void HandleServiceBindingNameMapping(YamlMappingNode yamlMappingNode, ConfigServiceBinding binding)
        {
            foreach (var child in yamlMappingNode.Children)
            {
                var key = YamlParser.GetScalarValue(child.Key);

                switch (key)
                {
                    case "name":
                        binding.Name = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "connectionString":
                        binding.ConnectionString = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "port":
                        if (!int.TryParse(YamlParser.GetScalarValue(key, child.Value), out var port))
                        {
                            throw new TyeYamlException(child.Value.Start, CoreStrings.FormatMustBeAnInteger(key));
                        }

                        binding.Port = port;
                        break;
                    case "containerPort":
                        if (!int.TryParse(YamlParser.GetScalarValue(key, child.Value), out var containerPort))
                        {
                            throw new TyeYamlException(child.Value.Start, CoreStrings.FormatMustBeAnInteger(key));
                        }

                        binding.ContainerPort = containerPort;
                        break;
                    case "host":
                        binding.Host = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "protocol":
                        binding.Protocol = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    default:
                        throw new TyeYamlException(child.Key.Start, CoreStrings.FormatUnrecognizedKey(key));
                }
            }
        }

        private static void HandleServiceVolumes(YamlSequenceNode yamlSequenceNode, List<ConfigVolume> volumes)
        {
            foreach (var child in yamlSequenceNode.Children)
            {
                YamlParser.ThrowIfNotYamlMapping(child);
                var volume = new ConfigVolume();
                HandleServiceVolumeNameMapping((YamlMappingNode)child, volume);
                volumes.Add(volume);
            }
        }

        private static void HandleServiceVolumeNameMapping(YamlMappingNode yamlMappingNode, ConfigVolume volume)
        {
            foreach (var child in yamlMappingNode!.Children)
            {
                var key = YamlParser.GetScalarValue(child.Key);

                switch (key)
                {
                    case "name":
                        volume.Name = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "source":
                        volume.Source = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "target":
                        volume.Target = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    default:
                        throw new TyeYamlException(child.Key.Start, CoreStrings.FormatUnrecognizedKey(key));
                }
            }
        }

        private static void HandleBuildProperties(YamlSequenceNode yamlSequenceNode, List<BuildProperty> buildProperties)
        {
            foreach (var child in yamlSequenceNode.Children)
            {
                YamlParser.ThrowIfNotYamlMapping(child);
                var buildProperty = new BuildProperty();
                HandleServiceBuildPropertyNameMapping((YamlMappingNode)child, buildProperty);
                buildProperties.Add(buildProperty);
            }
        }

        private static void HandleServiceConfiguration(YamlSequenceNode yamlSequenceNode, List<ConfigConfigurationSource> configuration)
        {
            foreach (var child in yamlSequenceNode.Children)
            {
                YamlParser.ThrowIfNotYamlMapping(child);
                var config = new ConfigConfigurationSource();
                HandleServiceConfigurationNameMapping((YamlMappingNode)child, config);
                configuration.Add(config);
            }
        }

        private static void HandleServiceConfigurationNameMapping(YamlMappingNode yamlMappingNode, ConfigConfigurationSource config)
        {
            foreach (var child in yamlMappingNode!.Children)
            {
                var key = YamlParser.GetScalarValue(child.Key);

                switch (key)
                {
                    case "name":
                        config.Name = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "value":
                        config.Value = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    default:
                        throw new TyeYamlException(child.Key.Start, CoreStrings.FormatUnrecognizedKey(key));
                }
            }
        }

        private static void HandleServiceBuildPropertyNameMapping(YamlMappingNode yamlMappingNode, BuildProperty buildProperty)
        {
            foreach (var child in yamlMappingNode!.Children)
            {
                var key = YamlParser.GetScalarValue(child.Key);

                switch (key)
                {
                    case "name":
                        buildProperty.Name = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    case "value":
                        buildProperty.Value = YamlParser.GetScalarValue(key, child.Value);
                        break;
                    default:
                        throw new TyeYamlException(child.Key.Start, CoreStrings.FormatUnrecognizedKey(key));
                }
            }
        }
    }
}