using System.Text;

namespace etoy
{
    class TSMetadataTableGenerater : IGenerater
    {
        private const string MetadataTypeArea = "<#MetadataTypeArea>";
        private const string CLASS_FILE_NAME = "xlsConfig.ts";
        public void Generate(Context context)
        {
            var tables = context.Blackboard.MetadataTables;
            var sbMetadataTypes = new StringBuilder();
            foreach (var table in tables)
                GenSingle(table, context, sbMetadataTypes);
            // metadata也写在XlsConfig
            var xlsConfigPath = Path.Combine(context.Option.ServerCodeOutput, CLASS_FILE_NAME);
            var xlsConfigText = File.ReadAllText(xlsConfigPath);
            xlsConfigText = xlsConfigText.Replace(MetadataTypeArea, sbMetadataTypes.ToString());
            File.WriteAllText(xlsConfigPath, xlsConfigText, Encoding.UTF8);
        }

        private void GenSingle(MetadataTable table, Context context, StringBuilder sbMetadataTypes)
        {
            foreach (var row in table.Rows)
            {
                var key = row.Struct.StructType;
                switch (key)
                {
                    case MetadataStructType.Struct:
                        GenStruct(row, sbMetadataTypes);
                        break;
                    case MetadataStructType.Enum:
                        GenEnum(row, sbMetadataTypes);
                        break;
                }
            }
        }

        private void GenStruct(MetadataRow row, StringBuilder sbMetadataTypes)
        {
            sbMetadataTypes.AppendLine($"export interface {row.Struct.Name} {{");
            // 属性定义
            foreach (var field in row.Struct.Fields)
            {
                var fieldType = field.FieldType.ToTSFieldType();// isContainsMetadataType ? $"{field.FieldType}" : field.FieldType;
                var fieldName = field.Name;
                if (field.StructRepeated)
                {// 数组
                    sbMetadataTypes.AppendLine($"    {fieldName}: {fieldType}[];");
                }
                else
                { // 字段
                    sbMetadataTypes.AppendLine($"    {fieldName}: {fieldType};");
                }
            }
            sbMetadataTypes.Append("}\n");
        }

        private void GenEnum(MetadataRow row, StringBuilder sbMetadataTypes)
        {
            sbMetadataTypes.Append($"export enum {row.Struct.Name} {{ ");
            foreach (var field in row.Struct.Fields)
            {
                if (string.IsNullOrEmpty(field.EnumValue))
                    sbMetadataTypes.Append($"{field.Name}, ");
                else
                    sbMetadataTypes.Append($"{field.Name} = {field.EnumValue}, ");
            }
            sbMetadataTypes.Append("}\n");
        }
    }
}