package io.trygvis.container.compiler.model;

import javax.lang.model.type.TypeKind;

public class TypeRef implements Comparable<TypeRef> {

    public static final TypeRef VOID = new TypeRef("void", "void");
    public static final TypeRef BOOLEAN = new TypeRef("boolean", null);
    public static final TypeRef BYTE = new TypeRef("byte", null);
    public static final TypeRef SHORT = new TypeRef("short", null);
    public static final TypeRef CHAR = new TypeRef("char", null);
    public static final TypeRef INT = new TypeRef("int", null);
    public static final TypeRef LONG = new TypeRef("long", null);
    public static final TypeRef FLOAT = new TypeRef("float", null);
    public static final TypeRef DOUBLE = new TypeRef("double", null);

    /**
     * The name of a class used within a class file. Is either the simple name or the canonical name.
     */
    public final String name;

    private final String canonicalName;

    public String canonicalName() {
        if (canonicalName == null) {
            throw new RuntimeException("This type doesn't have a canonical name");
        }

        return canonicalName;
    }

    public boolean isPrimitive() {
        return canonicalName == null;
    }

    public TypeRef(String name, String canonicalName) {
        this.name = name;
        this.canonicalName = canonicalName;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof TypeRef)) return false;

        TypeRef classRef = (TypeRef) o;

        return canonicalName.equals(classRef.canonicalName);
    }

    @Override
    public int hashCode() {
        return canonicalName.hashCode();
    }

    @Override
    public int compareTo(TypeRef o) {
        return canonicalName.compareTo(o.canonicalName);
    }

    public static TypeRef find(TypeKind kind) {
        switch (kind) {
            case BOOLEAN:
                return BOOLEAN;
            case BYTE:
                return BYTE;
            case SHORT:
                return SHORT;
            case CHAR:
                return CHAR;
            case INT:
                return INT;
            case LONG:
                return LONG;
            case FLOAT:
                return FLOAT;
            case DOUBLE:
                return DOUBLE;
        }

        throw new RuntimeException("Unknown kind: " + kind);
    }
}