/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package com.megatim.fdxcommons.tools.utils;

import com.megatim.fdxcommons.model.integration.TableDefinition;
import com.megatim.fdxcommons.tools.database.exceptions.BadDataValueException;
import com.megatim.fdxcommons.tools.database.exceptions.ColumnNotFoundException;
import com.megatim.fdxcommons.tools.database.exceptions.LocalDateTimeValueParseError;
import com.megatim.fdxcommons.tools.database.queries.metadata.FdxParsedDataRow;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ForkJoinTask;
import java.util.concurrent.RecursiveTask;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author ASUS
 */
public class FdxParsedDataAction extends RecursiveTask<List<Map<String, Object>>> {

    private final List<LinkedHashMap<String, Object>> sourceData;
    private final  TableDefinition tableDefinition;
    private final List<Map<String, Object>> cachedData = new ArrayList<>();
    private final int THRESHOLD = 5000;

    public FdxParsedDataAction(List<LinkedHashMap<String, Object>> sourceData,  TableDefinition tableDefinition) {
        this.sourceData = sourceData;
        this.tableDefinition = tableDefinition;
    }

    @Override
    protected List<Map<String, Object>> compute() {
        if (sourceData.size() > THRESHOLD) {
            ForkJoinTask
                    .invokeAll(createSubtasks())
                    .stream()
                    .map(FdxParsedDataAction::join)
                    .forEach(l -> cachedData.addAll(l));
            return cachedData;
        } else {
            if (cachedData.isEmpty()) {
                for (Map<String, Object> data : sourceData) {
                    try {
                        cachedData.add(new FdxParsedDataRow(data, tableDefinition).dataRow());
                    } catch (ColumnNotFoundException | BadDataValueException | LocalDateTimeValueParseError ex) {
                        Logger.getLogger(FdxParsedDataAction.class.getName()).log(Level.SEVERE, ex.getMessage(), ex);
                        throw new RuntimeException(ex);
                    }
                }
            }
            return cachedData;
        }
    }

    private List<FdxParsedDataAction> createSubtasks() {
        List<FdxParsedDataAction> subtasks = new ArrayList<>();
        int size = sourceData.size() / 4;
        int remainder = sourceData.size() % 4;

        subtasks.add(new FdxParsedDataAction(sourceData.subList(0, size), tableDefinition));
        subtasks.add(new FdxParsedDataAction(sourceData.subList(size, size * 2), tableDefinition));
        subtasks.add(new FdxParsedDataAction(sourceData.subList(size * 2, size * 3), tableDefinition));
        subtasks.add(new FdxParsedDataAction(sourceData.subList(size * 3, size * 4 + remainder), tableDefinition));

        return subtasks;
    }

}