package com.codigoparallevar.minicards.parts;

import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.AsyncTask;
import android.util.Log;

import com.codigoparallevar.minicards.ScrolledCanvas;
import com.codigoparallevar.minicards.parts.connectors.AnyRoundInputConnector;
import com.codigoparallevar.minicards.parts.connectors.ConnectorTypeInfo;
import com.codigoparallevar.minicards.parts.connectors.RoundOutputConnector;
import com.codigoparallevar.minicards.types.Moveable;
import com.codigoparallevar.minicards.types.Part;
import com.codigoparallevar.minicards.types.PartConnection;
import com.codigoparallevar.minicards.types.PartGrid;
import com.codigoparallevar.minicards.types.connectors.input.InputConnector;
import com.codigoparallevar.minicards.types.connectors.output.OutputConnector;
import com.codigoparallevar.minicards.types.functional.Tuple2;
import com.codigoparallevar.minicards.types.wireData.Signal;
import com.codigoparallevar.minicards.types.wireData.WireDataType;
import com.codigoparallevar.minicards.ui_helpers.DoAsync;
import com.programaker.api.ProgramakerApi;
import com.programaker.api.data.ProgramakerCustomBlock;
import com.programaker.api.data.ProgramakerCustomBlockArgument;
import com.programaker.api.data.ProgramakerCustomBlockSaveTo;
import com.programaker.api.data.ProgramakerFunctionCallResult;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.UUID;

public class ProgramakerCustomBlockPart implements Part {
    private static final int WIDTH_PADDING = 50;
    private static final int HEIGHT_PADDING = 50;
    private static final int IO_RADIUS = 50;
    private static final int IO_PADDING = 20;
    private static final String LogTag = "PM Custom block part";

    private List<Tuple2<ConnectorTypeInfo, AnyRoundInputConnector>> inputConnectors = null;
    private List<Tuple2<ConnectorTypeInfo, RoundOutputConnector>> outputConnectors = null;

    private final PartGrid _partGrid;
    private final String _id;
    private final ProgramakerCustomBlock _block;

    private int _left;
    private int _top;
    private int width = 100;
    private int height = 100;
    private String token = null;
    private Object[] lastValues;
    private boolean active = true;
    private Tuple2<ConnectorTypeInfo, RoundOutputConnector> saveToOutput;
    private RoundOutputConnector pulseOutput;


    public ProgramakerCustomBlockPart(String id, PartGrid grid, Tuple2<Integer, Integer> center, ProgramakerCustomBlock block) {
        this._id = id;
        this._partGrid = grid;
        this._block = block;

        this.updateWidthHeight();

        this._left = center.item1 - width / 2;
        this._top = center.item2 - height / 2;
        this.initialize();
    }

    private ProgramakerCustomBlockPart(String id, PartGrid grid, int left, int top, ProgramakerCustomBlock block) {
        this._id = id;
        this._partGrid = grid;
        this._block = block;

        this.updateWidthHeight();

        this._left = left;
        this._top = top;
        this.initialize();
    }

    public ProgramakerCustomBlockPart(PartGrid grid, Tuple2<Integer, Integer> center, ProgramakerCustomBlock block) {
        this(UUID.randomUUID().toString(), grid, center, block);
    }

    @Override
    public int get_left() {
        return _left;
    }

    @Override
    public int get_right() {
        return _left + width;
    }

    @Override
    public int get_top() {
        return _top;
    }

    @Override
    public int get_bottom() {
        return _top + height;
    }

    private Paint getTextPaint() {
        Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);
        p.setColor(Color.BLACK);
        p.setTextSize(50);
        return p;
    }

    private void updateWidthHeight() {
        Paint p = getTextPaint();
        String message = getMessage();
        Rect bounds = new Rect();
        p.getTextBounds(message, 0, message.length(), bounds);

        this.height = bounds.height() + HEIGHT_PADDING * 2;
        this.width = bounds.width() + WIDTH_PADDING * 2;
    }

    private void initialize() {
        this.updatePorts();
        lastValues = new Object[this.inputConnectors.size()];
    }

    private void updatePorts() {
        final String type = this._block.getBlock_type() == null ? "" : this._block.getBlock_type();
        final boolean has_pulse_input = type.equals("operation");
        final boolean has_pulse_output = has_pulse_input || type.equals("trigger");
        final boolean hasImplicitOutput = type.equals("getter");

        final List<Tuple2<ConnectorTypeInfo, AnyRoundInputConnector>> inputs = new LinkedList<>();
        final List<Tuple2<ConnectorTypeInfo, RoundOutputConnector>> outputs = new LinkedList<>();

        RoundOutputConnector pulseOutput = null;

        // Add pulses
        if (has_pulse_input) {
            inputs.add(new Tuple2<>(new ConnectorTypeInfo(ConnectorTypeInfo.Type.PULSE),
                    new AnyRoundInputConnector(this, 0, 0,
                            IO_RADIUS))
            );
        }
        if (has_pulse_output) {
            pulseOutput = new RoundOutputConnector(this, this._partGrid, 0, 0,
                    IO_RADIUS);
            outputs.add(new Tuple2<>(new ConnectorTypeInfo(ConnectorTypeInfo.Type.PULSE),
                    pulseOutput)
            );
        }

        // Add block IO
        ProgramakerCustomBlockArgument savedTo = null;

        if (_block.getArguments() != null) {
            ProgramakerCustomBlockSaveTo saveTo = _block.getSave_to();
            int skip = -1;

            if (saveTo != null) {
                if (saveTo.getType() != null
                        && saveTo.getType().equals("argument")) {
                    skip = saveTo.getIndex();
                }
                else {
                    Log.w(LogTag, "Unknown save-to type=" + saveTo.getType());
                }
            }

            int index = -1;
            for (ProgramakerCustomBlockArgument arg : _block.getArguments()) {
                index++;
                if (skip == index) {
                    savedTo = arg;
                }
                else {
                    inputs.add(new Tuple2<>(ConnectorTypeInfo.FromTypeName(arg.getType()),
                            new AnyRoundInputConnector(this, 0, 0, IO_RADIUS)));
                }
            }
        }

        Tuple2<ConnectorTypeInfo, RoundOutputConnector> saveToOutput = null;

        if (savedTo != null) {
            saveToOutput = new Tuple2<>(ConnectorTypeInfo.FromTypeName(savedTo.getType()),
                    new RoundOutputConnector(this, this._partGrid, 0, 0, IO_RADIUS));
            outputs.add(saveToOutput);
        }

        if (hasImplicitOutput) {
            outputs.add(new Tuple2<>(ConnectorTypeInfo.FromTypeName(_block.getBlock_result_type()),
                    new RoundOutputConnector(this, this._partGrid, 0, 0, IO_RADIUS)));
        }

        // Tie everything
        inputConnectors = inputs;
        outputConnectors = outputs;
        this.saveToOutput = saveToOutput;
        this.pulseOutput = pulseOutput;

        this.updatePortPositions();
    }
    
    private void updatePortPositions() {
        {
            // Update inputs
            int y = get_top();
            int x = get_left() + IO_PADDING;
            for (Tuple2<ConnectorTypeInfo, AnyRoundInputConnector> entry : inputConnectors) {
                InputConnector input = entry.item2;
                int new_x = x + IO_PADDING + IO_RADIUS / 2;
                input.updatePosition(new_x, y);
                x = x + IO_RADIUS * 2 + IO_PADDING * 2;
            }
        }
        {
            // Update outputs
            int y = get_bottom();
            int x = get_left() + IO_PADDING;
            for (Tuple2<ConnectorTypeInfo, RoundOutputConnector> entry : outputConnectors) {
                OutputConnector output = entry.item2;
                int new_x = x + IO_PADDING + IO_RADIUS / 2;
                output.updatePosition(new_x, y);
                x = x + IO_RADIUS * 2 + IO_PADDING * 2;
            }
        }
    }

    private String getMessage() {
        return this._block.getMessage();
    }

    @Override
    public void touched() {
        Log.i(LogTag, "Part touched (block_fun=" + this._block.getFunction_name() + ")");
    }

    @Override
    public List<InputConnector> getInputConnectors() {
        List<InputConnector> result = new ArrayList<>(inputConnectors.size());
        for (Tuple2<ConnectorTypeInfo, AnyRoundInputConnector> entry : inputConnectors) {
            result.add(entry.item2);
        }

        return result;
    }

    @Override
    public List<OutputConnector> getOutputConnectors() {
        List<OutputConnector> result = new ArrayList<>(outputConnectors.size());
        for (Tuple2<ConnectorTypeInfo, RoundOutputConnector> entry : outputConnectors) {
            result.add(entry.item2);
        }

        return result;
    }

    @Override
    public JSONObject serialize() throws JSONException {
        JSONObject serialized = new JSONObject();

        serialized.put("id", _id);
        serialized.put("left", _left);
        serialized.put("top", _top);

        JSONObject blockData = _block.serialize();
        serialized.put("block", blockData);

        serialized.put("on_string_output_connector", serializeConnectionEndpoints());

        return serialized;
    }

    private JSONArray serializeConnectionEndpoints() {
        JSONArray serializedData = new JSONArray();

        for (OutputConnector output : getOutputConnectors()) {
            JSONArray elements = new JSONArray();

            for (Tuple2<String, String> endpoint : (List<Tuple2<String, String>>) output.getConnectionEndpoints()) {
                elements.put(PartConnection.serializeToJson(endpoint.item1, endpoint.item2));
            }

            serializedData.put(elements);
        }
        return serializedData;
    }

    public static Tuple2<Part, List<PartConnection>> deserialize(PartGrid grid, JSONObject data) throws JSONException {
        String id = data.getString("id");
        int left = data.getInt("left");
        int top = data.getInt("top");

        JSONObject el = data.getJSONObject("block");
        ProgramakerCustomBlock block = ProgramakerCustomBlock.deserialize(el);
        ProgramakerCustomBlockPart part = new ProgramakerCustomBlockPart(id, grid, left, top, block);

        List<PartConnection> connections = new LinkedList<>();

        JSONArray allConnectorOuts = data.optJSONArray("on_string_output_connector");
        if (allConnectorOuts == null) {
            allConnectorOuts = new JSONArray();
        }

        for (int i = 0; i < allConnectorOuts.length(); i++) {
            JSONArray connectorOuts = allConnectorOuts.getJSONArray(i);
            Tuple2<ConnectorTypeInfo, RoundOutputConnector> connector = part.outputConnectors.get(i);
            for (int j = 0; j < connectorOuts.length(); j++) {
                connections.add(PartConnection.deserialize(
                        connector.item2, connectorOuts.getJSONObject(j)));
            }
        }

        return new Tuple2<>(part, connections);
    }


    @Override
    public void send(InputConnector inputConnector, WireDataType signal) {
        // Log.i(LogTag, "Received signal from Input="+inputConnector);
        ConnectorTypeInfo info = getConnectorInfo(inputConnector);
        if (info == null) {
            Log.e(LogTag, "Unknown connector" + inputConnector);
            return;
        }

        if (info.get_type() == ConnectorTypeInfo.Type.PULSE) {
            wrappedRunOperation();
        }
        else {
            int index = getConnectorIndex(inputConnector);
            if (index < 0) {
                return;
            }
            this.lastValues[index] = signal.get();
        }
    }

    private void wrappedRunOperation() {
        Log.d(LogTag, "Running block function=" + this._block.getFunction_name());
        String token = this.prepareStart();

        if (token != null) {
            try {
                new DoAsync().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,
                        new Tuple2<>(() -> {
                            ProgramakerCustomBlockPart.this.runBlockOperation();

                            ProgramakerCustomBlockPart.this.freeBlock(token);
                        }, ex -> {
                            Log.e(LogTag, "Error executing function=" + this._block.getFunction_name()
                                    + "; Error=" + ex, ex);
                            ProgramakerCustomBlockPart.this.freeBlock(token);
                        }));
            }
            catch (Exception ex) {
                Log.e(LogTag, "Error executing function=" + this._block.getFunction_name()
                        + "; Error=" + ex, ex);
                this.freeBlock(token);
            }
        } else {
            // An execution is in progress, so nothing is done
        }
    }

    private void runBlockOperation() {
        if (!this.active) {
            Log.w(LogTag, "Trying to run inactive block function=" + this._block.getFunction_name());
            return;
        }

        ProgramakerApi api = this._partGrid.getApi();
        List<String> arguments = new LinkedList<>();

        int index = -1;
        for (Tuple2<ConnectorTypeInfo, AnyRoundInputConnector> entry : inputConnectors) {
            index++;
            if (entry.item1.get_type() == ConnectorTypeInfo.Type.PULSE) {
                continue;
            }

            arguments.add(lastValues[index].toString()); // TODO: Do proper type formatting
        }

        ProgramakerFunctionCallResult result = api.callBlock(this._block, arguments);
        Log.d(LogTag, "Execution result="+result.getResult());

        onExecutionCompleted(result);
    }

    private void onExecutionCompleted(ProgramakerFunctionCallResult result) {
        Tuple2<ConnectorTypeInfo, RoundOutputConnector> savedTo = this.saveToOutput;
        if (savedTo != null) {
            // TODO: Fix output typing
            // savedTo.item2.send((WireDataType<Object>) () -> result.getResult());
        }

        RoundOutputConnector pulseOutput = this.pulseOutput;
        if (pulseOutput != null) {
            pulseOutput.send(new Signal());
        }
    }

    private void freeBlock(String token) {
        tryUpdateBlock(token, null);
    }

    private String prepareStart() {
        String token = UUID.randomUUID().toString();
        if (tryUpdateBlock(null, token)) {
            return token;
        }
        return null;
    }

    private synchronized boolean tryUpdateBlock(String oldVal, String newVal) {
        if (this.token == oldVal) {
            this.token = newVal;
            return true;
        }
        return false;
    }


    @Override
    public String get_id() {
        return _id;
    }

    @Override
    public InputConnector getConnectorWithId(String inputConnectorId) {
        if (inputConnectorId.startsWith("index=")) {
            String[] chunks = inputConnectorId.split("=");
            if (chunks.length > 1) {
                Integer index = null;
                try {
                    index = Integer.parseInt(chunks[1]);
                }
                catch (NumberFormatException ex) {
                    Log.e(LogTag, "Error parsing connector id="+inputConnectorId, ex);
                }

                if (index != null && index < inputConnectors.size()) {
                    return inputConnectors.get(index).item2;
                }
            }
        }
        return null;
    }

    private int getConnectorIndex(InputConnector inputConnector) {
        int index = 0;
        for (Tuple2<ConnectorTypeInfo, AnyRoundInputConnector> entry : inputConnectors) {
            if (entry.item2 == inputConnector) {
                return index;
            }
            index++;
        }

        return -1;
    }

    @Override
    public String getConnectorId(InputConnector inputConnector) {
        int index = getConnectorIndex(inputConnector);
        if (index < 0 ) {
            return null;
        }

        return "index=" + index;
    }

    public ConnectorTypeInfo getConnectorInfo(InputConnector inputConnector) {
        for (Tuple2<ConnectorTypeInfo, AnyRoundInputConnector> entry : inputConnectors) {
            if (entry.item2 == inputConnector) {
                return entry.item1;
            }
        }

        return null;
    }

    @Override
    public void resume() {
        this.active = true;
    }

    @Override
    public void pause() {
        this.active = false;
    }

    @Override
    public void draw(ScrolledCanvas canvas, boolean devMode) {

        updateWidthHeight(); // TODO: Remove after the calculations have stabilized

        if (!devMode) {
            return; // Logic block, don't show on user-mode
        }

        drawConnectors(canvas);
        drawWires(canvas, devMode);

        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(Color.WHITE);
        canvas.drawRect(
                new Rect(get_left(), get_top(),
                        get_right(), get_bottom()),
                paint);

        Paint textPaint = getTextPaint();
        canvas.drawText(getMessage(),
                get_left() + WIDTH_PADDING,
                get_bottom() - HEIGHT_PADDING,
                textPaint);
    }

    private void drawConnectors(ScrolledCanvas canvas) {
        if (inputConnectors != null) {
            for (Tuple2<ConnectorTypeInfo, AnyRoundInputConnector> entry : inputConnectors) {
                Paint outerInputConnectorPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
                outerInputConnectorPaint.setColor(entry.item1.getOuterColor());

                canvas.drawCircle(
                        entry.item2.getX(),
                        entry.item2.getY(),
                        entry.item2.getRadius(),
                        outerInputConnectorPaint);

                Paint innerInputConnectorPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
                innerInputConnectorPaint.setColor(entry.item1.getInnerColor());

                canvas.drawCircle(
                        entry.item2.getX(),
                        entry.item2.getY(),
                        entry.item2.getRadius() / 2,
                        innerInputConnectorPaint);
            }
        }

        if (outputConnectors != null) {
            for (Tuple2<ConnectorTypeInfo, RoundOutputConnector> entry : outputConnectors) {
                Paint outerOutputConnectorPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
                outerOutputConnectorPaint.setColor(entry.item1.getOuterColor());

                canvas.drawCircle(
                        entry.item2.getX(),
                        entry.item2.getY(),
                        entry.item2.getRadius(),
                        outerOutputConnectorPaint);

                Paint innerOutputConnectorPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
                innerOutputConnectorPaint.setColor(entry.item1.getInnerColor());

                canvas.drawCircle(
                        entry.item2.getX(),
                        entry.item2.getY(),
                        entry.item2.getRadius() / 2,
                        innerOutputConnectorPaint);
            }
        }
    }

    private void drawWires(ScrolledCanvas canvas, boolean devMode) {
        for (OutputConnector outputConnector : getOutputConnectors()){
            outputConnector.drawWires(canvas, devMode);
        }
    }

    @Override
    public void moveEnd(int x, int y) {
        _left = x - width / 2;
        _top = y - height / 2;

        this.updatePortPositions();
    }

    @Override
    public void drop(int x, int y) {
        moveEnd(x, y);
    }

    @Override
    public boolean containsPoint(int x, int y) {
        return ((x >= this.get_left()) && (x <= this.get_right())
                && (y >= this.get_top()) && (y <= this.get_bottom()));
    }

    @Override
    public Moveable getMoveable() {
        return this;
    }

    @Override
    public void unlink() {
        this.active = false;
        for (InputConnector input : getInputConnectors()) {
            input.unlink();
        }
    }
}