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package com.oracle.graal.python.builtins.objects.exception;

import static com.oracle.graal.python.builtins.objects.exception.UnicodeErrorBuiltins.IDX_ENCODING;
import static com.oracle.graal.python.builtins.objects.exception.UnicodeErrorBuiltins.IDX_END;
import static com.oracle.graal.python.builtins.objects.exception.UnicodeErrorBuiltins.IDX_OBJECT;
import static com.oracle.graal.python.builtins.objects.exception.UnicodeErrorBuiltins.IDX_REASON;
import static com.oracle.graal.python.builtins.objects.exception.UnicodeErrorBuiltins.IDX_START;
import static com.oracle.graal.python.builtins.objects.exception.UnicodeErrorBuiltins.UNICODE_ERROR_ATTR_FACTORY;
import static com.oracle.graal.python.builtins.objects.exception.UnicodeErrorBuiltins.getArgAsInt;
import static com.oracle.graal.python.builtins.objects.exception.UnicodeErrorBuiltins.getArgAsString;
import static com.oracle.graal.python.nodes.SpecialMethodNames.J___INIT__;
import static com.oracle.graal.python.nodes.SpecialMethodNames.J___STR__;
import static com.oracle.graal.python.nodes.StringLiterals.T_EMPTY_STRING;
import static com.oracle.graal.python.util.PythonUtils.TS_ENCODING;

import java.util.List;

import com.oracle.graal.python.builtins.Builtin;
import com.oracle.graal.python.builtins.CoreFunctions;
import com.oracle.graal.python.builtins.PythonBuiltinClassType;
import com.oracle.graal.python.builtins.PythonBuiltins;
import com.oracle.graal.python.builtins.objects.PNone;
import com.oracle.graal.python.builtins.objects.str.StringUtils.SimpleTruffleStringFormatNode;
import com.oracle.graal.python.lib.PyObjectStrAsTruffleStringNode;
import com.oracle.graal.python.nodes.function.PythonBuiltinBaseNode;
import com.oracle.graal.python.nodes.function.PythonBuiltinNode;
import com.oracle.graal.python.nodes.function.builtins.PythonUnaryBuiltinNode;
import com.oracle.graal.python.nodes.util.CastToJavaIntExactNode;
import com.oracle.graal.python.nodes.util.CastToTruffleStringNode;
import com.oracle.graal.python.util.PythonUtils;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateNodeFactory;
import com.oracle.truffle.api.dsl.NodeFactory;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.strings.TruffleString;

@CoreFunctions(extendClasses = PythonBuiltinClassType.UnicodeEncodeError)
public final class UnicodeEncodeErrorBuiltins extends PythonBuiltins {
    @Override
    protected List<? extends NodeFactory<? extends PythonBuiltinBaseNode>> getNodeFactories() {
        return UnicodeEncodeErrorBuiltinsFactory.getFactories();
    }

    @Builtin(name = J___INIT__, minNumOfPositionalArgs = 1, takesVarArgs = true)
    @GenerateNodeFactory
    public abstract static class UnicodeEncodeErrorInitNode extends PythonBuiltinNode {
        public abstract Object execute(PBaseException self, Object[] args);

        @Specialization
        Object initNoArgs(PBaseException self, Object[] args,
                        @Cached CastToTruffleStringNode toStringNode,
                        @Cached CastToJavaIntExactNode toJavaIntExactNode,
                        @Cached BaseExceptionBuiltins.BaseExceptionInitNode baseInitNode) {
            baseInitNode.execute(self, args);
            // PyArg_ParseTuple(args, "UUnnU"), TODO: add proper error messages
            self.setExceptionAttributes(new Object[]{
                            getArgAsString(args, 0, this, toStringNode),
                            getArgAsString(args, 1, this, toStringNode),
                            getArgAsInt(args, 2, this, toJavaIntExactNode),
                            getArgAsInt(args, 3, this, toJavaIntExactNode),
                            getArgAsString(args, 4, this, toStringNode)
            });
            return PNone.NONE;
        }
    }

    @Builtin(name = J___STR__, minNumOfPositionalArgs = 1)
    @GenerateNodeFactory
    public abstract static class UnicodeEncodeErrorStrNode extends PythonUnaryBuiltinNode {
        @Specialization
        TruffleString str(VirtualFrame frame, PBaseException self,
                        @Cached BaseExceptionAttrNode attrNode,
                        @Cached CastToTruffleStringNode toTruffleStringNode,
                        @Cached PyObjectStrAsTruffleStringNode strNode,
                        @Cached TruffleString.CodePointLengthNode codePointLengthNode,
                        @Cached TruffleString.CodePointAtIndexNode codePointAtIndexNode,
                        @Cached SimpleTruffleStringFormatNode simpleTruffleStringFormatNode) {
            if (self.getExceptionAttributes() == null) {
                // Not properly initialized.
                return T_EMPTY_STRING;
            }

            // Get reason and encoding as strings, which they might not be if they've been
            // modified after we were constructed.
            final TruffleString object = toTruffleStringNode.execute(attrNode.get(self, IDX_OBJECT, UNICODE_ERROR_ATTR_FACTORY));
            final int start = attrNode.getInt(self, IDX_START, UNICODE_ERROR_ATTR_FACTORY);
            final int end = attrNode.getInt(self, IDX_END, UNICODE_ERROR_ATTR_FACTORY);
            final TruffleString encoding = strNode.execute(frame, attrNode.get(self, IDX_ENCODING, UNICODE_ERROR_ATTR_FACTORY));
            final TruffleString reason = strNode.execute(frame, attrNode.get(self, IDX_REASON, UNICODE_ERROR_ATTR_FACTORY));
            if (start < codePointLengthNode.execute(object, TS_ENCODING) && end == start + 1) {
                final int badChar = codePointAtIndexNode.execute(object, start, TS_ENCODING);
                String badCharStr;
                if (badChar <= 0xFF) {
                    badCharStr = PythonUtils.formatJString("\\x%02x", badChar);
                } else if (badChar <= 0xFFFF) {
                    badCharStr = PythonUtils.formatJString("\\u%04x", badChar);
                } else {
                    badCharStr = PythonUtils.formatJString("\\U%08x", badChar);
                }
                return simpleTruffleStringFormatNode.format("'%s' codec can't encode character '%s' in position %d: %s", encoding, badCharStr, start, reason);
            } else {
                return simpleTruffleStringFormatNode.format("'%s' codec can't encode characters in position %d-%d: %s", encoding, start, end - 1, reason);
            }
        }
    }
}
