// ==========================================================================
//  Squidex Headless CMS
// ==========================================================================
//  Copyright (c) Squidex UG (haftungsbeschraenkt)
//  All rights reserved. Licensed under the MIT license.
// ==========================================================================

using Elasticsearch.Net;

namespace Squidex.Extensions.Text.ElasticSearch
{
    public static class ElasticSearchIndexDefinition
    {
        private static readonly Dictionary<string, string> FieldPaths;
        private static readonly Dictionary<string, string> FieldAnalyzers = new Dictionary<string, string>
        {
            ["ar"] = "arabic",
            ["hy"] = "armenian",
            ["eu"] = "basque",
            ["bn"] = "bengali",
            ["br"] = "brazilian",
            ["bg"] = "bulgarian",
            ["ca"] = "catalan",
            ["zh"] = "cjk",
            ["ja"] = "cjk",
            ["ko"] = "cjk",
            ["cs"] = "czech",
            ["da"] = "danish",
            ["nl"] = "dutch",
            ["en"] = "english",
            ["fi"] = "finnish",
            ["fr"] = "french",
            ["gl"] = "galician",
            ["de"] = "german",
            ["el"] = "greek",
            ["hi"] = "hindi",
            ["hu"] = "hungarian",
            ["id"] = "indonesian",
            ["ga"] = "irish",
            ["it"] = "italian",
            ["lv"] = "latvian",
            ["lt"] = "lithuanian",
            ["no"] = "norwegian",
            ["pt"] = "portuguese",
            ["ro"] = "romanian",
            ["ru"] = "russian",
            ["ku"] = "sorani",
            ["es"] = "spanish",
            ["sv"] = "swedish",
            ["tr"] = "turkish",
            ["th"] = "thai"
        };

        static ElasticSearchIndexDefinition()
        {
            FieldPaths = FieldAnalyzers.ToDictionary(x => x.Key, x => $"texts.{x.Key}");
        }

        public static string GetFieldName(string key)
        {
            if (FieldAnalyzers.ContainsKey(key))
            {
                return key;
            }

            if (key.Length > 0)
            {
                var language = key[2..];

                if (FieldAnalyzers.ContainsKey(language))
                {
                    return language;
                }
            }

            return "iv";
        }

        public static string GetFieldPath(string key)
        {
            if (FieldPaths.TryGetValue(key, out var path))
            {
                return path;
            }

            if (key.Length > 0)
            {
                var language = key[2..];

                if (FieldPaths.TryGetValue(language, out path))
                {
                    return path;
                }
            }

            return "texts.iv";
        }

        public static async Task ApplyAsync(IElasticLowLevelClient elastic, string indexName,
            CancellationToken ct = default)
        {
            var query = new
            {
                properties = new Dictionary<string, object>
                {
                    ["geoObject"] = new
                    {
                        type = "geo_point"
                    }
                }
            };

            foreach (var (key, analyzer) in FieldAnalyzers)
            {
                query.properties[GetFieldPath(key)] = new
                {
                    type = "text",
                    analyzer
                };
            }

            var result = await elastic.Indices.PutMappingAsync<StringResponse>(indexName, CreatePost(query), ctx: ct);

            if (!result.Success)
            {
                throw new InvalidOperationException($"Failed with ${result.Body}", result.OriginalException);
            }
        }

        private static PostData CreatePost<T>(T data)
        {
            return new SerializableData<T>(data);
        }
    }
}