using ExcelDataReader;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;

namespace etoy
{
    class CmdReadKeyValueTable : Command
    {
        const string SEARCH_PATTERN = "*.kv";
        ExcelReaderConfiguration _excelReaderConfiguration;

        KeyValueTableCsvParser _parser = new KeyValueTableCsvParser();

        public override string Description => "读取KeyValue表";

        protected override void OnProcess()
        {
            SetProgress(0.1f);

            _excelReaderConfiguration = new ExcelReaderConfiguration() { AutodetectSeparators = new char[] { ',' } };

            var kvs = Directory.GetFiles(Context.Option.CsvOutput, SEARCH_PATTERN, SearchOption.TopDirectoryOnly);

            List<KeyValueTable> tables = new List<KeyValueTable>();

            SetProgress(0.4f);

            foreach (var kv in kvs)
                ReadSingle(kv.ToPath(), tables);
            
            SetProgress(0.8f);

            Context.Blackboard.KeyValueTables = tables;

            Completed();
        }

        void ReadSingle(string file, List<KeyValueTable> tables)
        {
            using Stream metadata = new FileStream(file, FileMode.Open, FileAccess.Read);

            IExcelDataReader reader = ExcelReaderFactory.CreateCsvReader(metadata, _excelReaderConfiguration);

            DataSet dataSet = reader.AsDataSet();
            if (dataSet.Tables.Count != 1)
                throw new Exception($"KeyValue表 Table数量不为1, {file}");


            DataTable dt = dataSet.Tables[0];
            if (dt == null)
                throw new Exception($"KeyValue表 DataTable等于空, {file}");

            KeyValueTable table = _parser.Parse(dt, file);

            tables.Add(table);

            metadata.Close();
            reader.Close();
            reader.Dispose();
        }
    }
}