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 ***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
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 *
 * Software distributed under the License is distributed on an "AS
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package org.jruby.util;

import org.jruby.Ruby;
import org.jruby.RubyBasicObject;
import org.jruby.RubyArray;
import org.jruby.RubyBoolean;
import org.jruby.RubyClass;
import org.jruby.RubyEncoding;
import org.jruby.RubyFixnum;
import org.jruby.RubyFloat;
import org.jruby.RubyHash;
import org.jruby.RubyIO;
import org.jruby.RubyInteger;
import org.jruby.RubyModule;
import org.jruby.RubyNumeric;
import org.jruby.RubyString;
import org.jruby.RubySymbol;
import org.jruby.exceptions.RaiseException;
import org.jruby.runtime.ClassIndex;
import org.jruby.RubyNil;
import org.jruby.runtime.JavaSites;
import org.jruby.runtime.JavaSites.TypeConverterSites;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;

import static org.jruby.util.RubyStringBuilder.str;
import static org.jruby.util.RubyStringBuilder.types;

public class TypeConverter {

    
Converts this object to type 'targetType' using 'convertMethod' method (MRI: convert_type).
Params:
obj – the object to convert
target – is the type we are trying to convert to
convertMethod – is the method to be called to try and convert to target type
raise – will throw an Error if conversion does not work
Returns:
the converted value/**
     * Converts this object to type 'targetType' using 'convertMethod' method (MRI: convert_type).
     *
     * @param obj the object to convert
     * @param target is the type we are trying to convert to
     * @param convertMethod is the method to be called to try and convert to target type
     * @param raise will throw an Error if conversion does not work
     * @return the converted value
     */
    public static IRubyObject convertToType(IRubyObject obj, RubyClass target, String convertMethod, boolean raise) {
        return convertToType(target.getClassRuntime().getCurrentContext(), obj, target, convertMethod, raise);
    }

    public static IRubyObject convertToType(ThreadContext context, IRubyObject obj, RubyClass target, String convertMethod, boolean raise) {
        IRubyObject r = obj.checkCallMethod(context, convertMethod);
        return r == null ? handleUncoercibleObject(context.runtime, obj, target, raise) : r;
    }

    
Converts this object to type 'targetType' using 'convertMethod' method (MRI: convert_type 1.9).
Params:
obj – the object to convert
target – is the type we are trying to convert to
sites – is the CheckedSites call sites to be called to try and convert to targetType
raise – will throw an Error if conversion does not work
Returns:
the converted value/**
     * Converts this object to type 'targetType' using 'convertMethod' method (MRI: convert_type 1.9).
     *
     * @param obj the object to convert
     * @param target is the type we are trying to convert to
     * @param sites is the CheckedSites call sites to be called to try and convert to targetType
     * @param raise will throw an Error if conversion does not work
     * @return the converted value
     */
    public static IRubyObject convertToType(ThreadContext context, IRubyObject obj, RubyClass target, JavaSites.CheckedSites sites, boolean raise) {
        IRubyObject r = obj.checkCallMethod(context, sites);

        return r == null ? handleUncoercibleObject(context.runtime, obj, target, raise) : r;
    }

    
Converts this object to type 'targetType' using 'convertMethod' method and raises TypeError exception on failure (MRI: rb_convert_type).
Params:
obj – the object to convert
target – is the type we are trying to convert to
convertMethod – is the method to be called to try and convert to targeType
Returns:
the converted value/**
     * Converts this object to type 'targetType' using 'convertMethod' method and raises TypeError exception on failure (MRI: rb_convert_type).
     *
     * @param obj the object to convert
     * @param target is the type we are trying to convert to
     * @param convertMethod is the method to be called to try and convert to targeType
     * @return the converted value
     */
    public static IRubyObject convertToType(IRubyObject obj, RubyClass target, String convertMethod) {
        if (target.isInstance(obj)) return obj;
        IRubyObject val = convertToType(obj, target, convertMethod, true);
        if (!target.isInstance(val)) throw newTypeError(obj.getRuntime(), obj, target, convertMethod, val);
        return val;

    }

    
Converts this object to type 'targetType' using 'convertMethod' method and raises TypeError exception on failure (MRI: rb_convert_type).
Params:
obj – the object to convert
target – is the type we are trying to convert to
sites – is the CheckedSites call sites to use to dispatch the convert method
Returns:
the converted value/**
     * Converts this object to type 'targetType' using 'convertMethod' method and raises TypeError exception on failure (MRI: rb_convert_type).
     *
     * @param obj the object to convert
     * @param target is the type we are trying to convert to
     * @param sites is the CheckedSites call sites to use to dispatch the convert method
     * @return the converted value
     */
    public static IRubyObject convertToType(ThreadContext context, IRubyObject obj, RubyClass target, JavaSites.CheckedSites sites) {
        if (target.isInstance(obj)) return obj;
        IRubyObject val = convertToType(context, obj, target, sites, true);
        if (!target.isInstance(val)) throw newTypeError(context.runtime, obj, target, sites.methodName, val);
        return val;
    }

    @Deprecated // not-used
    public static IRubyObject convertToType19(IRubyObject obj, RubyClass target, String convertMethod, boolean raise) {
        return convertToType(obj, target, convertMethod, raise);
    }

    @Deprecated // not-used
    public static IRubyObject convertToType19(ThreadContext context, IRubyObject obj, RubyClass target, JavaSites.CheckedSites sites, boolean raise) {
        return convertToType(context, obj, target, sites, raise);
    }

    @Deprecated // not-used
    public static IRubyObject convertToType19(IRubyObject obj, RubyClass target, String convertMethod) {
        return convertToType(obj, target, convertMethod);
    }

    @Deprecated // not-used
    public static IRubyObject convertToType19(ThreadContext context, IRubyObject obj, RubyClass target, JavaSites.CheckedSites sites) {
        return convertToType(context, obj, target, sites);
    }

    // MRI: rb_to_float - adjusted to handle also Java numbers (non RubyNumeric types)
    public static RubyFloat toFloat(Ruby runtime, IRubyObject obj) {
        if (obj instanceof RubyNumeric) {
            return ((RubyNumeric) obj).convertToFloat();
        }
        if (obj instanceof RubyString || obj.isNil()) {
            throw runtime.newTypeError(obj, "Float");
        }
        return (RubyFloat) TypeConverter.convertToType(obj, runtime.getFloat(), "to_f", true);
    }

    
Checks that this object is of type DATA and then returns it, otherwise raises failure (MRI: Check_Type(obj, T_DATA))
Params:
obj – the object to check
Returns:
the converted value/**
     * Checks that this object is of type DATA and then returns it, otherwise raises failure (MRI: Check_Type(obj, T_DATA))
     *
     * @param obj the object to check
     * @return the converted value
     */
    public static IRubyObject checkData(IRubyObject obj) {
        if (obj instanceof org.jruby.runtime.marshal.DataType) return obj;

        Ruby runtime = obj.getRuntime();
        throw runtime.newTypeError(str(runtime, "wrong argument type ", typeAsString(obj), " (expected Data)"));
    }

    public static RubyString typeAsString(IRubyObject obj) {
        if (obj.isNil()) return obj.getRuntime().newString("nil");
        if (obj instanceof RubyBoolean) return obj.getRuntime().newString(obj.isTrue() ? "true" : "false");

        return obj.getMetaClass().getRealClass().rubyName();
    }



    
Convert the supplied object into an internal identifier String.  Basically, symbols
are stored internally as raw bytes from whatever encoding they were originally sourced from.
When methods are stored they must also get stored in this same raw fashion so that if we
use symbols to look up methods or make symbols from these method names they will match up.
For 2.2 compatibility, we also force all incoming identifiers to get anchored as hard-referenced symbols.
/**
     * Convert the supplied object into an internal identifier String.  Basically, symbols
     * are stored internally as raw bytes from whatever encoding they were originally sourced from.
     * When methods are stored they must also get stored in this same raw fashion so that if we
     * use symbols to look up methods or make symbols from these method names they will match up.
     *
     * For 2.2 compatibility, we also force all incoming identifiers to get anchored as hard-referenced symbols.
     */
    public static RubySymbol checkID(IRubyObject obj) {
        final Ruby runtime = obj.getRuntime();
        if ( obj instanceof RubySymbol || obj instanceof RubyString ) {
            return RubySymbol.newHardSymbol(runtime, obj);
        }

        final IRubyObject str = convertToTypeWithCheck(obj, runtime.getString(), "to_str");
        if ( ! str.isNil() ) {
            return RubySymbol.newHardSymbol(runtime, str);
        }

        final ThreadContext context = runtime.getCurrentContext();
        throw runtime.newTypeError(obj.callMethod(context, "inspect") + " is not a symbol nor a string");
    }

    
Convert the supplied object into an internal identifier String.  Basically, symbols
are stored internally as raw bytes from whatever encoding they were originally sourced from.
When methods are stored they must also get stored in this same raw fashion so that if we
use symbols to look up methods or make symbols from these method names they will match up.
For 2.2 compatibility, we also force all incoming identifiers to get anchored as hard-referenced symbols.
/**
     * Convert the supplied object into an internal identifier String.  Basically, symbols
     * are stored internally as raw bytes from whatever encoding they were originally sourced from.
     * When methods are stored they must also get stored in this same raw fashion so that if we
     * use symbols to look up methods or make symbols from these method names they will match up.
     *
     * For 2.2 compatibility, we also force all incoming identifiers to get anchored as hard-referenced symbols.
     */
    public static RubySymbol checkID(Ruby runtime, String name) {
        return RubySymbol.newHardSymbol(runtime, name.intern());
    }

    
Higher level conversion utility similar to convertToType but it can throw an
additional TypeError during conversion (MRI: rb_check_convert_type).
Params:
obj – the object to convert
target – is the type we are trying to convert to
convertMethod – is the method to be called to try and convert to targeType
Returns:
the converted value/**
     * Higher level conversion utility similar to convertToType but it can throw an
     * additional TypeError during conversion (MRI: rb_check_convert_type).
     *
     * @param obj the object to convert
     * @param target is the type we are trying to convert to
     * @param convertMethod is the method to be called to try and convert to targeType
     * @return the converted value
     */
    public static IRubyObject convertToTypeWithCheck(IRubyObject obj, RubyClass target, String convertMethod) {
        if (target.isInstance(obj)) return obj;
        IRubyObject val = convertToType(obj, target, convertMethod, false);
        if (val.isNil()) return val;
        if (!target.isInstance(val)) {
            throw newTypeError(obj, target, convertMethod, val);
        }
        return val;
    }

    
Higher level conversion utility similar to convertToType but it can throw an
additional TypeError during conversion (MRI: rb_check_convert_type).
Params:
obj – the object to convert
target – is the type we are trying to convert to
sites – the CheckedSites call sites to use for coersion
Returns:
the converted value/**
     * Higher level conversion utility similar to convertToType but it can throw an
     * additional TypeError during conversion (MRI: rb_check_convert_type).
     *
     * @param obj the object to convert
     * @param target is the type we are trying to convert to
     * @param sites the CheckedSites call sites to use for coersion
     * @return the converted value
     */
    public static IRubyObject convertToTypeWithCheck(ThreadContext context, IRubyObject obj, RubyClass target, JavaSites.CheckedSites sites) {
        if (target.isInstance(obj)) return obj;
        IRubyObject val = convertToType(context, obj, target, sites, false);
        if (val == context.nil) return val;
        if (!target.isInstance(val)) {
            throw newTypeError(context.runtime, obj, target, sites.methodName, val);
        }
        return val;
    }

    @Deprecated
    public static IRubyObject convertToTypeWithCheck19(IRubyObject obj, RubyClass target, String convertMethod) {
        return convertToTypeWithCheck(obj, target, convertMethod);
    }

    @Deprecated
    public static IRubyObject convertToTypeWithCheck19(ThreadContext context, IRubyObject obj, RubyClass target, JavaSites.CheckedSites sites) {
        return convertToTypeWithCheck(context, obj, target, sites);
    }

    public static RaiseException newTypeError(IRubyObject obj, RubyClass target, String convertMethod, IRubyObject val) {
        return newTypeError(obj.getRuntime(), obj, target, convertMethod, val);
    }

    public static RaiseException newTypeError(Ruby runtime, IRubyObject obj, RubyClass target, String methodName, IRubyObject val) {
        IRubyObject className =  types(runtime, obj.getMetaClass());
        return runtime.newTypeError(str(runtime, "can't convert ", className, " to ", types(runtime, target), " (",
                className, '#' + methodName + " gives ", types(runtime, val.getMetaClass()), ")"));
    }

    // rb_check_to_integer
    public static IRubyObject checkIntegerType(ThreadContext context, IRubyObject obj) {
        if (obj instanceof RubyFixnum) return obj;

        TypeConverterSites sites = sites(context);

        IRubyObject conv = convertToTypeWithCheck(context, obj, context.runtime.getInteger(), sites.to_int_checked);

        return conv instanceof RubyInteger ? conv : context.nil;
    }

    // rb_check_to_integer
    public static IRubyObject checkIntegerType(Ruby runtime, IRubyObject obj, String method) {
        if (method.equals("to_int")) return checkIntegerType(runtime.getCurrentContext(), obj);

        if (obj instanceof RubyFixnum) return obj;

        if (method.equals("to_i")) {
            ThreadContext context = runtime.getCurrentContext();
            TypeConverterSites sites = sites(context);

            IRubyObject conv = convertToTypeWithCheck(context, obj, runtime.getInteger(), sites.to_i_checked);
            return conv instanceof RubyInteger ? conv : runtime.getNil();
        }

        IRubyObject conv = TypeConverter.convertToType(obj, runtime.getInteger(), method, false);
        return conv instanceof RubyInteger ? conv : runtime.getNil();
    }

    // rb_check_to_float
    public static IRubyObject checkFloatType(Ruby runtime, IRubyObject obj) {
        if (obj instanceof RubyFloat) return obj;
        if (!(obj instanceof RubyNumeric)) return runtime.getNil();

        ThreadContext context = runtime.getCurrentContext();
        TypeConverterSites sites = sites(context);

        return TypeConverter.convertToTypeWithCheck(context, obj, runtime.getFloat(), sites.to_f_checked);
    }

    // rb_check_hash_type
    public static IRubyObject checkHashType(Ruby runtime, IRubyObject obj) {
        if (obj instanceof RubyHash) return obj;
        return TypeConverter.convertToTypeWithCheck(obj, runtime.getHash(), "to_hash");
    }

    // rb_check_hash_type
    public static IRubyObject checkHashType(ThreadContext context, JavaSites.CheckedSites sites, IRubyObject obj) {
        if (obj instanceof RubyHash) return obj;
        return TypeConverter.convertToTypeWithCheck(context, obj, context.runtime.getHash(), sites);
    }

    // rb_check_string_type
    public static IRubyObject checkStringType(Ruby runtime, IRubyObject obj) {
        if (obj instanceof RubyString) return obj;
        return TypeConverter.convertToTypeWithCheck(obj, runtime.getString(), "to_str");
    }

    // rb_check_string_type
    public static IRubyObject checkStringType(ThreadContext context, JavaSites.CheckedSites sites, IRubyObject obj) {
        if (obj instanceof RubyString) return obj;
        return TypeConverter.convertToTypeWithCheck(context, obj, context.runtime.getString(), sites);
    }

    // rb_check_string_type
    public static IRubyObject checkStringType(ThreadContext context, JavaSites.CheckedSites sites, IRubyObject obj, RubyClass target) {
        if (obj instanceof RubyString) return obj;
        return TypeConverter.convertToTypeWithCheck(context, obj, target, sites);
    }

    // rb_check_array_type
    public static IRubyObject checkArrayType(Ruby runtime, IRubyObject obj) {
        if (obj instanceof RubyArray) return obj;
        return TypeConverter.convertToTypeWithCheck(obj, runtime.getArray(), "to_ary");
    }

    // rb_check_array_type
    public static IRubyObject checkArrayType(ThreadContext context, JavaSites.CheckedSites sites, IRubyObject obj) {
        if (obj instanceof RubyArray) return obj;
        return TypeConverter.convertToTypeWithCheck(context, obj, context.runtime.getArray(), sites);
    }

    // rb_io_check_io
    public static IRubyObject ioCheckIO(Ruby runtime, IRubyObject obj) {
        if (obj instanceof RubyIO) return obj;
        return TypeConverter.convertToTypeWithCheck(obj, runtime.getIO(), "to_io");
    }

    // rb_io_get_io
    public static RubyIO ioGetIO(Ruby runtime, IRubyObject obj) {
        return (RubyIO)convertToType(obj, runtime.getIO(), "to_io");
    }

    // MRI: rb_check_array_type
    public static IRubyObject checkArrayType(ThreadContext context, IRubyObject obj) {
        return TypeConverter.convertToTypeWithCheck(context, obj, context.runtime.getArray(), sites(context).to_ary_checked);
    }

    @Deprecated // no longer used
    public static IRubyObject checkArrayType(IRubyObject obj) {
        return checkArrayType(obj.getRuntime().getCurrentContext(), obj);
    }

    public static IRubyObject handleUncoercibleObject(boolean raise, IRubyObject obj, RubyClass target) {
        return handleUncoercibleObject(obj.getRuntime(), obj, target, raise);
    }

    public static IRubyObject handleUncoercibleObject(Ruby runtime, IRubyObject obj, RubyClass target, boolean raise) {
        if (raise) throw runtime.newTypeError(str(runtime, "no implicit conversion of ", typeAsString(obj), " into " , target));
        return runtime.getNil();
    }

    @Deprecated // not-used
    public static IRubyObject handleImplicitlyUncoercibleObject(boolean raise, IRubyObject obj, RubyClass target) {
        return handleUncoercibleObject(obj.getRuntime(), obj, target, raise);
    }

    // rb_check_type and Check_Type
    public static void checkType(ThreadContext context, IRubyObject x, final RubyModule type) {
        assert x != RubyBasicObject.UNDEF;

        ClassIndex xt = x.getMetaClass().getClassIndex();

        // MISSING: special error for T_DATA of a certain type (isInstance is attempt at similar behavior)
        if (xt != type.getClassIndex() && !type.isInstance(x)) {
            Ruby runtime = context.runtime;
            throw context.runtime.newTypeError(str(runtime, "wrong argument type ", types(runtime, x.getMetaClass()), " (expected ", types(runtime, type), ")"));
        }
    }

    // rb_convert_to_integer
    public static IRubyObject convertToInteger(ThreadContext context, IRubyObject val, int base) {
        final Ruby runtime = context.runtime;
        IRubyObject tmp;

        for (;;) {
            switch (val.getMetaClass().getClassIndex()) {
                case FLOAT:
                    if (base != 0) raiseIntegerBaseError(context);
                    return RubyNumeric.dbl2ival(context.runtime, ((RubyFloat) val).getValue());
                case INTEGER:
                    if (base != 0) raiseIntegerBaseError(context);
                    return val;
                case STRING:
                    return RubyNumeric.str2inum(context.runtime, (RubyString) val, base, true);
                case NIL:
                    if (base != 0) raiseIntegerBaseError(context);
                    throw context.runtime.newTypeError("can't convert nil into Integer");
                default: // MRI checks String sub-classes
                    if (val instanceof RubyString) {
                        return RubyNumeric.str2inum(context.runtime, (RubyString) val, base, true);
                    }
            }

            if (base != 0) {
                tmp = TypeConverter.checkStringType(context.runtime, val);
                if (tmp != context.nil) continue;
                raiseIntegerBaseError(context);
            }

            break;
        }

        tmp = TypeConverter.convertToType(context, val, runtime.getInteger(), sites(context).to_int_checked, false);
        return (tmp != context.nil) ? tmp : TypeConverter.convertToType(context, val, runtime.getInteger(), sites(context).to_i_checked);
    }

    // MRI: rb_Array
    public static RubyArray rb_Array(ThreadContext context, IRubyObject val) {
        IRubyObject tmp = checkArrayType(context, val); // to_ary

        if (tmp == context.nil) {
            TypeConverterSites sites = sites(context);
            tmp = convertToTypeWithCheck(context, val, context.runtime.getArray(), sites.to_a_checked);
            if (tmp == context.nil) {
                return context.runtime.newArray(val);
            }
        }
        return (RubyArray) tmp;
    }

    // MRI: to_ary
    public static RubyArray to_ary(ThreadContext context, IRubyObject ary) {
        return (RubyArray) convertToType(context, ary, context.runtime.getArray(), sites(context).to_ary_checked);
    }

    private static void raiseIntegerBaseError(ThreadContext context) {
        throw context.runtime.newArgumentError("base specified for non string value");
    }

    private static TypeConverterSites sites(ThreadContext context) {
        return context.sites.TypeConverter;
    }

    @Deprecated
    public static IRubyObject convertToType(IRubyObject obj, RubyClass target, int convertMethodIndex, String convertMethod, boolean raise) {
        if (!obj.respondsTo(convertMethod)) return handleUncoercibleObject(raise, obj, target);

        return obj.callMethod(obj.getRuntime().getCurrentContext(), convertMethod);
    }

    @Deprecated
    public static IRubyObject convertToType(IRubyObject obj, RubyClass target, int convertMethodIndex, String convertMethod) {
        if (target.isInstance(obj)) return obj;
        IRubyObject val = convertToType(obj, target, convertMethod, true);
        if (!target.isInstance(val)) {
            Ruby runtime = obj.getRuntime();
            throw runtime.newTypeError(str(runtime, types(runtime, obj.getMetaClass()), "#" + convertMethod + " should return ", types(runtime, target)));
        }
        return val;
    }

    @Deprecated
    public static IRubyObject convertToTypeWithCheck(IRubyObject obj, RubyClass target, int convertMethodIndex, String convertMethod) {
        if (target.isInstance(obj)) return obj;
        IRubyObject val = TypeConverter.convertToType(obj, target, convertMethod, false);
        if (val.isNil()) return val;
        if (!target.isInstance(val)) {
            Ruby runtime = obj.getRuntime();
            throw runtime.newTypeError(str(runtime, types(runtime, obj.getMetaClass()), "#" + convertMethod + " should return ", types(runtime, target)));
        }
        return val;
    }

    @Deprecated
    public static String convertToIdentifier(IRubyObject obj) {
        // Assume Symbol already returns ISO8859-1/raw bytes from asJavaString()
        // Assume all other objects cannot participate in providing raw bytes since we cannot
        // grab it's string representation without calling a method which properly encodes
        // the string.
        if (obj instanceof RubyString) {
            return RubyEncoding.decodeISO(((RubyString) obj).getByteList()).intern();
        }
        return obj.asJavaString().intern();
    }
    
Higher level conversion utility similar to convertToType but it can throw an
additional TypeError during conversion (MRI: rb_check_convert_type).
Params:
obj – the object to convert
target – is the type we are trying to convert to
convertMethod – is the method to be called to try and convert to targeType
Returns:
the converted value/**
     * Higher level conversion utility similar to convertToType but it can throw an
     * additional TypeError during conversion (MRI: rb_check_convert_type).
     *
     * @param obj the object to convert
     * @param target is the type we are trying to convert to
     * @param convertMethod is the method to be called to try and convert to targeType
     * @return the converted value
     */
    @Deprecated // no longer used
    public static IRubyObject convertToTypeOrRaise(IRubyObject obj, RubyClass target, String convertMethod) {
        if (target.isInstance(obj)) return obj;
        IRubyObject val = TypeConverter.convertToType(obj, target, convertMethod, true);
        if (val.isNil()) return val;
        if (!target.isInstance(val)) {
            Ruby runtime = obj.getRuntime();
            throw runtime.newTypeError(str(runtime, types(runtime, obj.getMetaClass()), "#" + convertMethod + " should return ", types(runtime, target)));
        }
        return val;
    }
}