using System.Text;

namespace etoy
{
    class TSXlsConfigGenerater : IGenerater
    {
        //导入json
        private const string RequireJsonArea = "<#requireJsonArea>";
        // 表类型
        private const string TableTypeArea = "<#TableTypeArea>";
        // 表数组定义
        private const string TableRepositoryDefineArea = "<#TableRepositoryDefineArea>";
        // 表数组赋值
        private const string TableRepositoryAssignArea = "<#TableRepositoryAssignArea>";

        private const string CLASS_FILE_NAME = "xlsConfig.ts";
        private string CodeTemplatePath => Path.Combine(Environment.CurrentDirectory, "Configs/TSTemplates", CLASS_FILE_NAME);
        public void Generate(Context context)
        {
            var tables = context.Blackboard.Tables;
            var sbRequireJsons = new StringBuilder();
            var sbTableTypes = new StringBuilder();
            var sbTableRepoDefines = new StringBuilder();
            var sbTableRepoAssigns = new StringBuilder();
            foreach (var table in tables)
            {
                if (table.TableTag.HasFlag(TableTag.Server))
                {
                    var tableName = table.Name;
                    sbRequireJsons.AppendLine($"const {tableName} = require(\"./excel/{tableName}.json\")");
                    GenTableType(table, sbTableTypes);
                    sbTableRepoDefines.AppendLine($"    xls{tableName}: xls{tableName}[]");
                    sbTableRepoAssigns.AppendLine($"        this.xls{tableName} = <xls{tableName}[]>{tableName}");
                }
            }

            var xlsConfigText = File.ReadAllText(CodeTemplatePath);
            xlsConfigText = xlsConfigText.Replace(RequireJsonArea, sbRequireJsons.ToString());
            xlsConfigText = xlsConfigText.Replace(TableTypeArea, sbTableTypes.ToString());
            xlsConfigText = xlsConfigText.Replace(TableRepositoryDefineArea, sbTableRepoDefines.ToString());
            xlsConfigText = xlsConfigText.Replace(TableRepositoryAssignArea, sbTableRepoAssigns.ToString());
            var xlsConfigPath =  Path.Combine(context.Option.ServerCodeOutput, CLASS_FILE_NAME);
            File.WriteAllText(xlsConfigPath, xlsConfigText, Encoding.UTF8);
            // metadata也写在XlsConfig，这里直接继续
            var metadataGenerater = new TSMetadataTableGenerater();
            metadataGenerater.Generate(context);
        }

        private void GenTableType(Table table, StringBuilder sbTableTypes)
        {
            sbTableTypes.Append($"export type xls{table.Name} = {{");
            var isFieldFirst = true;
            // var pkFieldInfo = table.GetPKFieldInfo();
            // 属性定义
            for (int i = 0, length = table.FieldInfos.Length; i < length; i++)
            {
                var fieldInfo = table.FieldInfos[i];
                // no export server’s field
                if (!fieldInfo.IsServerField)
                    continue;
                string fieldType = fieldInfo.FieldType.ToTSFieldType();
                var fieldName = fieldInfo.FieldName;
                if (!isFieldFirst)
                {
                    sbTableTypes.Append(',');
                }
                else
                {
                    isFieldFirst = false;
                }
                if (fieldInfo.IsRepeated)
                {
                    // 数组
                    sbTableTypes.Append($" {fieldName}: {fieldType}[]");
                }
                else
                { // 字段
                    sbTableTypes.Append($" {fieldName}: {fieldType}");
                }
            }
            sbTableTypes.Append(" }\n");
        }
    }
}