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package com.jsoniter.any;

import com.jsoniter.*;

import com.jsoniter.output.JsonStream;

import com.jsoniter.spi.JsonException;

import com.jsoniter.spi.TypeLiteral;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

class ArrayLazyAny extends LazyAny {

private final static TypeLiteral<List<Any>> typeLiteral = new TypeLiteral<List<Any>>() {

};

private List<Any> cache;

private int lastParsedPos;

public ArrayLazyAny(byte[] data, int head, int tail) {

super(data, head, tail);

lastParsedPos = head;

}

@Override

public ValueType valueType() {

return ValueType.ARRAY;

}

@Override

public Object object() {

fillCache();

return cache;

}

@Override

public boolean toBoolean() {

try {

return CodegenAccess.readArrayStart(parse());

} catch (IOException e) {

throw new JsonException(e);

}

}

@Override

public int toInt() {

return size();

}

@Override

public long toLong() {

return size();

}

@Override

public float toFloat() {

return size();

}

@Override

public double toDouble() {

return size();

}

@Override

public int size() {

fillCache();

return cache.size();

}

@Override

public Iterator<Any> iterator() {

if (lastParsedPos == tail) {

return cache.iterator();

} else {

return new LazyIterator();

}

}

@Override

public Any get(int index) {

try {

return fillCacheUntil(index);

} catch (IndexOutOfBoundsException e) {

return new NotFoundAny(index, object());

}

}

@Override

public Any get(Object[] keys, int idx) {

if (idx == keys.length) {

return this;

}

Object key = keys[idx];

if (isWildcard(key)) {

fillCache();

ArrayList<Any> result = new ArrayList<Any>();

for (Any element : cache) {

Any mapped = element.get(keys, idx + 1);

if (mapped.valueType() != ValueType.INVALID) {

result.add(mapped);

}

}

return Any.rewrap(result);

}

try {

return fillCacheUntil((Integer) key).get(keys, idx + 1);

} catch (IndexOutOfBoundsException e) {

return new NotFoundAny(keys, idx, object());

} catch (ClassCastException e) {

return new NotFoundAny(keys, idx, object());

}

}

private void fillCache() {

if (lastParsedPos == tail) {

return;

}

if (cache == null) {

cache = new ArrayList<Any>(4);

}

try {

JsonIterator iter = JsonIterator.tlsIter.get();

iter.reset(data, lastParsedPos, tail);

if (lastParsedPos == head) {

if (!CodegenAccess.readArrayStart(iter)) {

lastParsedPos = tail;

return;

}

cache.add(iter.readAny());

}

while (CodegenAccess.nextToken(iter) == ',') {

cache.add(iter.readAny());

}

lastParsedPos = tail;

} catch (IOException e) {

throw new JsonException(e);

}

}

private Any fillCacheUntil(int target) {

if (lastParsedPos == tail) {

return cache.get(target);

}

if (cache == null) {

cache = new ArrayList<Any>(4);

}

int i = cache.size();

if (target < i) {

return cache.get(target);

}

try {

JsonIterator iter = JsonIterator.tlsIter.get();

iter.reset(data, lastParsedPos, tail);

if (lastParsedPos == head) {

if (!CodegenAccess.readArrayStart(iter)) {

lastParsedPos = tail;

throw new IndexOutOfBoundsException();

}

Any element = iter.readAny();

cache.add(element);

if (target == 0) {

lastParsedPos = CodegenAccess.head(iter);

return element;

}

i = 1;

}

while (CodegenAccess.nextToken(iter) == ',') {

Any element = iter.readAny();

cache.add(element);

if (i++ == target) {

lastParsedPos = CodegenAccess.head(iter);

return element;

}

}

lastParsedPos = tail;

} catch (IOException e) {

throw new JsonException(e);

}

throw new IndexOutOfBoundsException();

}

private class LazyIterator implements Iterator<Any> {

private Any next;

private int index;

public LazyIterator() {

index = 0;

next = fillCacheUntil(index);

}

@Override

public void remove() {

throw new UnsupportedOperationException();

}

@Override

public boolean hasNext() {

return next != null;

}

@Override

public Any next() {

if (next == null) {

throw new IndexOutOfBoundsException();

}

Any current = next;

try {

index++;

next = fillCacheUntil(index);

} catch (IndexOutOfBoundsException e){

next = null;

}

return current;

}

}

@Override

public void writeTo(JsonStream stream) throws IOException {

if (lastParsedPos == head) {

super.writeTo(stream);

} else {

// there might be modification

fillCache();

stream.writeVal(typeLiteral, cache);

}

}

@Override

public String toString() {

if (lastParsedPos == head) {

return super.toString();

} else {

fillCache();

return JsonStream.serialize(cache);

}

}

}