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package com.oracle.truffle.regex.tregex.dfa;

import java.util.Arrays;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.regex.charset.CodePointSet;
import com.oracle.truffle.regex.tregex.automaton.AbstractTransition;
import com.oracle.truffle.regex.tregex.automaton.StateSet;
import com.oracle.truffle.regex.tregex.automaton.TransitionBuilder;
import com.oracle.truffle.regex.tregex.automaton.TransitionSet;
import com.oracle.truffle.regex.tregex.nfa.NFA;
import com.oracle.truffle.regex.tregex.nfa.NFAState;
import com.oracle.truffle.regex.tregex.nfa.NFAStateTransition;
import com.oracle.truffle.regex.tregex.util.json.Json;
import com.oracle.truffle.regex.tregex.util.json.JsonArray;
import com.oracle.truffle.regex.tregex.util.json.JsonConvertible;
import com.oracle.truffle.regex.tregex.util.json.JsonValue;

public class DFAStateTransitionBuilder extends TransitionBuilder<NFA, NFAState, NFAStateTransition> implements AbstractTransition<DFAStateNodeBuilder, DFAStateTransitionBuilder>, JsonConvertible {

    private int id = -1;
    private DFAStateNodeBuilder source;
    private DFAStateNodeBuilder target;

    public DFAStateTransitionBuilder(NFAStateTransition[] transitions, StateSet<NFA, NFAState> targetStateSet, CodePointSet matcherBuilder) {
        super(transitions, targetStateSet, matcherBuilder);
    }

    public DFAStateTransitionBuilder(TransitionSet<NFA, NFAState, NFAStateTransition> transitionSet, CodePointSet matcherBuilder) {
        super(transitionSet, matcherBuilder);
    }

    public DFAStateTransitionBuilder createNodeSplitCopy() {
        return new DFAStateTransitionBuilder(getTransitionSet(), getCodePointSet());
    }

    @Override
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @Override
    public DFAStateNodeBuilder getSource() {
        return source;
    }

    public void setSource(DFAStateNodeBuilder source) {
        this.source = source;
    }

    @Override
    public DFAStateNodeBuilder getTarget() {
        return target;
    }

    public void setTarget(DFAStateNodeBuilder target) {
        this.target = target;
    }

    @TruffleBoundary
    @Override
    public String toString() {
        return source + " -" + getCodePointSet() + "-> " + target;
    }

    @TruffleBoundary
    @Override
    public JsonValue toJson() {
        JsonArray nfaTransitions = Json.array(Arrays.stream(getTransitionSet().getTransitions()).map(t -> Json.val(t.getId())));
        if (target.getAnchoredFinalStateTransition() != null) {
            nfaTransitions.append(Json.val(target.getAnchoredFinalStateTransition().getId()));
        }
        if (target.getUnAnchoredFinalStateTransition() != null) {
            nfaTransitions.append(Json.val(target.getUnAnchoredFinalStateTransition().getId()));
        }
        return Json.obj(Json.prop("id", id),
                        Json.prop("source", source.getId()),
                        Json.prop("target", target.getId()),
                        Json.prop("matcherBuilder", getCodePointSet().toString()),
                        Json.prop("nfaTransitions", nfaTransitions));
    }
}