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/*
 * Copyright (C) 2017 Square, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.squareup.moshi;

import com.jn.langx.annotation.Nullable;
import okio.Buffer;
import okio.BufferedSink;
import okio.ForwardingSink;
import okio.Okio;

import java.io.IOException;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import static com.squareup.moshi.JsonScope.*;
import static java.lang.Double.NEGATIVE_INFINITY;
import static java.lang.Double.POSITIVE_INFINITY;

/**
 * Writes JSON by building a Java object comprising maps, lists, and JSON primitives.
 */
final class JsonValueWriter extends JsonWriter {
    Object[] stack = new Object[32];
    private @Nullable String deferredName;

    JsonValueWriter() {
        pushScope(EMPTY_DOCUMENT);
    }

    public Object root() {
        int size = stackSize;
        if (size > 1 || size == 1 && scopes[size - 1] != NONEMPTY_DOCUMENT) {
            throw new IllegalStateException("Incomplete document");
        }
        return stack[0];
    }

    @Override
    public JsonWriter beginArray() throws IOException {
        if (promoteValueToName) {
            throw new IllegalStateException(
                    "Array cannot be used as a map key in JSON at path " + getPath());
        }
        if (stackSize == flattenStackSize && scopes[stackSize - 1] == EMPTY_ARRAY) {
            // Cancel this open. Invert the flatten stack size until this is closed.
            flattenStackSize = ~flattenStackSize;
            return this;
        }
        checkStack();
        List list = new ArrayList();
        add(list);
        stack[stackSize] = list;
        pathIndices[stackSize] = 0;
        pushScope(EMPTY_ARRAY);
        return this;
    }

    @Override
    public JsonWriter endArray() throws IOException {
        if (peekScope() != EMPTY_ARRAY) {
            throw new IllegalStateException("Nesting problem.");
        }
        if (stackSize == ~flattenStackSize) {
            // Cancel this close. Restore the flattenStackSize so we're ready to flatten again!
            flattenStackSize = ~flattenStackSize;
            return this;
        }
        stackSize--;
        stack[stackSize] = null;
        pathIndices[stackSize - 1]++;
        return this;
    }

    @Override
    public JsonWriter beginObject() throws IOException {
        if (promoteValueToName) {
            throw new IllegalStateException(
                    "Object cannot be used as a map key in JSON at path " + getPath());
        }
        if (stackSize == flattenStackSize && scopes[stackSize - 1] == EMPTY_OBJECT) {
            // Cancel this open. Invert the flatten stack size until this is closed.
            flattenStackSize = ~flattenStackSize;
            return this;
        }
        checkStack();
        Map map = new LinkedHashTreeMap();
        add(map);
        stack[stackSize] = map;
        pushScope(EMPTY_OBJECT);
        return this;
    }

    @Override
    public JsonWriter endObject() throws IOException {
        if (peekScope() != EMPTY_OBJECT) {
            throw new IllegalStateException("Nesting problem.");
        }
        if (deferredName != null) {
            throw new IllegalStateException("Dangling name: " + deferredName);
        }
        if (stackSize == ~flattenStackSize) {
            // Cancel this close. Restore the flattenStackSize so we're ready to flatten again!
            flattenStackSize = ~flattenStackSize;
            return this;
        }
        promoteValueToName = false;
        stackSize--;
        stack[stackSize] = null;
        pathNames[stackSize] = null; // Free the last path name so that it can be garbage collected!
        pathIndices[stackSize - 1]++;
        return this;
    }

    @Override
    public JsonWriter name(String name) throws IOException {
        if (name == null) {
            throw new NullPointerException("name == null");
        }
        if (stackSize == 0) {
            throw new IllegalStateException("JsonWriter is closed.");
        }
        if (peekScope() != EMPTY_OBJECT || deferredName != null) {
            throw new IllegalStateException("Nesting problem.");
        }
        deferredName = name;
        pathNames[stackSize - 1] = name;
        promoteValueToName = false;
        return this;
    }

    @Override
    public JsonWriter value(@Nullable String value) throws IOException {
        if (promoteValueToName) {
            return name(value);
        }
        add(value);
        pathIndices[stackSize - 1]++;
        return this;
    }

    @Override
    public JsonWriter nullValue() throws IOException {
        if (promoteValueToName) {
            throw new IllegalStateException(
                    "null cannot be used as a map key in JSON at path " + getPath());
        }
        add(null);
        pathIndices[stackSize - 1]++;
        return this;
    }

    @Override
    public JsonWriter value(boolean value) throws IOException {
        if (promoteValueToName) {
            throw new IllegalStateException(
                    "Boolean cannot be used as a map key in JSON at path " + getPath());
        }
        add(value);
        pathIndices[stackSize - 1]++;
        return this;
    }

    @Override
    public JsonWriter value(@Nullable Boolean value) throws IOException {
        if (promoteValueToName) {
            throw new IllegalStateException(
                    "Boolean cannot be used as a map key in JSON at path " + getPath());
        }
        add(value);
        pathIndices[stackSize - 1]++;
        return this;
    }

    @Override
    public JsonWriter value(double value) throws IOException {
        if (!lenient
                && (Double.isNaN(value) || value == NEGATIVE_INFINITY || value == POSITIVE_INFINITY)) {
            throw new IllegalArgumentException("Numeric values must be finite, but was " + value);
        }
        if (promoteValueToName) {
            return name(Double.toString(value));
        }
        add(value);
        pathIndices[stackSize - 1]++;
        return this;
    }

    @Override
    public JsonWriter value(long value) throws IOException {
        if (promoteValueToName) {
            return name(Long.toString(value));
        }
        add(value);
        pathIndices[stackSize - 1]++;
        return this;
    }

    @Override
    public JsonWriter value(@Nullable Number value) throws IOException {
        // If it's trivially converted to a long, do that.
        if (value instanceof Byte
                || value instanceof Short
                || value instanceof Integer
                || value instanceof Long) {
            return value(value.longValue());
        }

        // If it's trivially converted to a double, do that.
        if (value instanceof Float || value instanceof Double) {
            return value(value.doubleValue());
        }

        if (value == null) {
            return nullValue();
        }

        // Everything else gets converted to a BigDecimal.
        BigDecimal bigDecimalValue = value instanceof BigDecimal
                ? ((BigDecimal) value)
                : new BigDecimal(value.toString());
        if (promoteValueToName) {
            return name(bigDecimalValue.toString());
        }
        add(bigDecimalValue);
        pathIndices[stackSize - 1]++;
        return this;
    }

    @Override
    public BufferedSink valueSink() {
        if (promoteValueToName) {
            throw new IllegalStateException(
                    "BufferedSink cannot be used as a map key in JSON at path " + getPath());
        }
        if (peekScope() == STREAMING_VALUE) {
            throw new IllegalStateException("Sink from valueSink() was not closed");
        }
        pushScope(STREAMING_VALUE);

        final Buffer buffer = new Buffer();
        return Okio.buffer(new ForwardingSink(buffer) {
            @Override
            public void close() throws IOException {
                if (peekScope() != STREAMING_VALUE || stack[stackSize] != null) {
                    throw new AssertionError();
                }
                stackSize--; // Remove STREAMING_VALUE from the stack.

                Object value = JsonReader.of(buffer).readJsonValue();
                boolean serializeNulls = JsonValueWriter.this.serializeNulls;
                JsonValueWriter.this.serializeNulls = true;
                try {
                    add(value);
                } finally {
                    JsonValueWriter.this.serializeNulls = serializeNulls;
                }
                pathIndices[stackSize - 1]++;
            }
        });
    }

    @Override
    public void close() throws IOException {
        int size = stackSize;
        if (size > 1 || size == 1 && scopes[size - 1] != NONEMPTY_DOCUMENT) {
            throw new IOException("Incomplete document");
        }
        stackSize = 0;
    }

    @Override
    public void flush() throws IOException {
        if (stackSize == 0) {
            throw new IllegalStateException("JsonWriter is closed.");
        }
    }

    private JsonValueWriter add(@Nullable Object newTop) {
        int scope = peekScope();

        if (stackSize == 1) {
            if (scope != EMPTY_DOCUMENT) {
                throw new IllegalStateException("JSON must have only one top-level value.");
            }
            scopes[stackSize - 1] = NONEMPTY_DOCUMENT;
            stack[stackSize - 1] = newTop;

        } else if (scope == EMPTY_OBJECT && deferredName != null) {
            if (newTop != null || serializeNulls) {
                @SuppressWarnings("unchecked") // Our maps always have string keys and object values.
                        Map map = (Map) stack[stackSize - 1];
                Object replaced = map.put(deferredName, newTop);
                if (replaced != null) {
                    throw new IllegalArgumentException("Map key '" + deferredName
                            + "' has multiple values at path " + getPath() + ": " + replaced + " and " + newTop);
                }
            }
            deferredName = null;

        } else if (scope == EMPTY_ARRAY) {
            @SuppressWarnings("unchecked") // Our lists always have object values.
                    List list = (List) stack[stackSize - 1];
            list.add(newTop);

        } else if (scope == STREAMING_VALUE) {
            throw new IllegalStateException("Sink from valueSink() was not closed");

        } else {
            throw new IllegalStateException("Nesting problem.");
        }

        return this;
    }
}
    

    

    

            

    

            



    
    






    
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