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package com.satori.mods.suite;

import com.satori.composer.runtime.*;
import com.satori.mods.api.*;
import com.satori.mods.core.async.*;
import com.satori.mods.core.config.*;
import com.satori.mods.core.stats.*;

import java.util.*;

import com.fasterxml.jackson.databind.*;
import org.slf4j.*;

public class Composition extends Mod {
  public static final Logger log = LoggerFactory.getLogger(Composition.class);
  
  private final ArrayList mods = new ArrayList<>();
  private final HashMap pins = new HashMap<>();
  
  public Composition() throws Exception {
  }
  
  public Composition(JsonNode userData) throws Exception {
    this(Config.parseAndValidate(userData, CompositionSettings.class));
  }
  
  public Composition(CompositionSettings config) throws Exception {
    this(config.mods);
    
    config.outputs.forEach(this::linkOutput);
  }
  
  public Composition(HashMap mods) {
    mods.forEach((modName, modConf) -> {
      IMod mod = ModFactory.create(modConf.type, modConf.settings);
      addMod(modName, mod, modConf.connectors);
    });
  }
  
  // IMod implementation
  
  @Override
  public void init(IModContext context) throws Exception {
    super.init(context);
    for (IMod mod : mods) {
      mod.init(context);
    }
    log.info("initialized");
  }
  
  @Override
  public void onStart() throws Exception {
    for (IMod mod : mods) {
      mod.onStart();
    }
    log.info("started");
  }
  
  @Override
  public void onStop() throws Exception {
    for (IMod mod : mods) {
      mod.onStop();
    }
    log.info("stopped");
  }

  @Override
  public void dispose() throws Exception {
    super.dispose();
    for (IMod mod : mods) {
      mod.dispose();
    }
    log.info("disposed");
  }
  
  @Override
  public void onPulse() {
    log.debug("pulse received");
    mods.forEach(mod -> mod.onPulse());
  }
  
  @Override
  public void onStats(StatsCycle cycle, IStatsCollector collector) {
    log.debug("collecting statistic...");
    mods.forEach(mod -> mod.onStats(cycle, collector));
  }
  
  @Override
  public void onInput(String input, JsonNode data, IAsyncHandler cont) throws Exception {
    CompositionPin pin = pins.get(input);
    if (pin == null) {
      cont.fail("connectors not found");
      return;
    }
    pin.yield(data, cont);
  }
  
  public void linkOutput(String pinRef) {
    CompositionPin pin = pins.computeIfAbsent(pinRef, k -> new CompositionPin());
    pin.linkOutput((msg, cont) -> {
      try {
        yield(msg, cont);
      } catch (Exception e) {
        cont.fail(e);
      }
    });
  }
  
  public void linkModInput(IMod mod, String inputName, String pinRef) {
    CompositionPin pin = pins.computeIfAbsent(pinRef, k -> new CompositionPin());
    pin.linkOutput((data, cont) -> {
      try {
        mod.onInput(inputName, data, cont);
      } catch (Exception e) {
        cont.fail(e);
      }
    });
  }
  
  public CompositionNode addMod(String name, IMod mod, HashMap> inputs) {
    CompositionPin pin = pins.computeIfAbsent(name, k -> new CompositionPin());
    CompositionNode node = new CompositionNode(name, mod, pin);
    this.mods.add(node);
    if (inputs != null) {
      inputs.forEach((inputName, pinRefs) -> {
        if (pinRefs == null) {
          return;
        }
        pinRefs.forEach(pinRef -> {
          linkModInput(mod, inputName, pinRef);
        });
      });
    }
    return node;
  }
  
  public CompositionNode addMod(String name, IMod mod) {
    return addMod(name, mod, null);
  }
}