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package com.jsoniter.output;

import java.lang.reflect.Type;

import java.util.*;

class CodegenImplArray {

public static CodegenResult genArray(String cacheKey, Class clazz) {

Class compType = clazz.getComponentType();

if (compType.isArray()) {

throw new IllegalArgumentException("nested array not supported: " + clazz.getCanonicalName());

}

boolean isCollectionValueNullable = true;

if (cacheKey.endsWith("__value_not_nullable")) {

isCollectionValueNullable = false;

}

if (compType.isPrimitive()) {

isCollectionValueNullable = false;

}

CodegenResult ctx = new CodegenResult();

ctx.append("public static void encode_(java.lang.Object obj, com.jsoniter.output.JsonStream stream) throws java.io.IOException {");

ctx.append(String.format("%s[] arr = (%s[])obj;", compType.getCanonicalName(), compType.getCanonicalName()));

ctx.append("if (arr.length == 0) { return; }");

ctx.buffer('[');

ctx.append("int i = 0;");

ctx.append(String.format("%s e = arr[i++];", compType.getCanonicalName()));

if (isCollectionValueNullable) {

ctx.append("if (e == null) { stream.writeNull(); } else {");

CodegenImplNative.genWriteOp(ctx, "e", compType, true);

ctx.append("}");

} else {

CodegenImplNative.genWriteOp(ctx, "e", compType, false);

}

ctx.append("while (i < arr.length) {");

ctx.append("stream.write(',');");

ctx.append("e = arr[i++];");

if (isCollectionValueNullable) {

ctx.append("if (e == null) { stream.writeNull(); } else {");

CodegenImplNative.genWriteOp(ctx, "e", compType, true);

ctx.append("}");

} else {

CodegenImplNative.genWriteOp(ctx, "e", compType, false);

}

ctx.append("}");

ctx.buffer(']');

ctx.append("}");

return ctx;

}

public static CodegenResult genCollection(String cacheKey, Class clazz, Type[] typeArgs) {

Type compType = Object.class;

if (typeArgs.length == 0) {

// default to List<Object>

} else if (typeArgs.length == 1) {

compType = typeArgs[0];

} else {

throw new IllegalArgumentException(

"can not bind to generic collection without argument types, " +

"try syntax like TypeLiteral<List<Integer>>{}");

}

if (clazz == List.class) {

clazz = ArrayList.class;

} else if (clazz == Set.class) {

clazz = HashSet.class;

}

if (List.class.isAssignableFrom(clazz)) {

return genList(cacheKey, clazz, compType);

} else {

return genCollection(cacheKey, clazz, compType);

}

}

private static CodegenResult genList(String cacheKey, Class clazz, Type compType) {

boolean isCollectionValueNullable = true;

if (cacheKey.endsWith("__value_not_nullable")) {

isCollectionValueNullable = false;

}

CodegenResult ctx = new CodegenResult();

ctx.append("public static void encode_(java.lang.Object obj, com.jsoniter.output.JsonStream stream) throws java.io.IOException {");

ctx.append("java.util.List list = (java.util.List)obj;");

ctx.append("int size = list.size();");

ctx.append("if (size == 0) { return; }");

ctx.buffer('[');

ctx.append("java.lang.Object e = list.get(0);");

if (isCollectionValueNullable) {

ctx.append("if (e == null) { stream.writeNull(); } else {");

CodegenImplNative.genWriteOp(ctx, "e", compType, true);

ctx.append("}");

} else {

CodegenImplNative.genWriteOp(ctx, "e", compType, false);

}

ctx.append("for (int i = 1; i < size; i++) {");

ctx.append("stream.write(',');");

ctx.append("e = list.get(i);");

if (isCollectionValueNullable) {

ctx.append("if (e == null) { stream.writeNull(); } else {");

CodegenImplNative.genWriteOp(ctx, "e", compType, true);

ctx.append("}");

} else {

CodegenImplNative.genWriteOp(ctx, "e", compType, false);

}

ctx.append("}");

ctx.buffer(']');

ctx.append("}");

return ctx;

}

private static CodegenResult genCollection(String cacheKey, Class clazz, Type compType) {

boolean isCollectionValueNullable = true;

if (cacheKey.endsWith("__value_not_nullable")) {

isCollectionValueNullable = false;

}

CodegenResult ctx = new CodegenResult();

ctx.append("public static void encode_(java.lang.Object obj, com.jsoniter.output.JsonStream stream) throws java.io.IOException {");

ctx.append("java.util.Iterator iter = ((java.util.Collection)obj).iterator();");

ctx.append("if (!iter.hasNext()) { return; }");

ctx.buffer('[');

ctx.append("java.lang.Object e = iter.next();");

if (isCollectionValueNullable) {

ctx.append("if (e == null) { stream.writeNull(); } else {");

CodegenImplNative.genWriteOp(ctx, "e", compType, true);

ctx.append("}");

} else {

CodegenImplNative.genWriteOp(ctx, "e", compType, false);

}

ctx.append("while (iter.hasNext()) {");

ctx.append("stream.write(',');");

ctx.append("e = iter.next();");

if (isCollectionValueNullable) {

ctx.append("if (e == null) { stream.writeNull(); } else {");

CodegenImplNative.genWriteOp(ctx, "e", compType, true);

ctx.append("}");

} else {

CodegenImplNative.genWriteOp(ctx, "e", compType, false);

}

ctx.append("}");

ctx.buffer(']');

ctx.append("}");

return ctx;

}

}