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package com.jsoniter;

import java.lang.reflect.Type;

import java.util.*;

class CodegenImplArray {

final static Set<Class> WITH_CAPACITY_COLLECTION_CLASSES = new HashSet<Class>() {{

add(ArrayList.class);

add(HashSet.class);

add(Vector.class);

}};

public static String genArray(Class clazz) {

Class compType = clazz.getComponentType();

if (compType.isArray()) {

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

}

StringBuilder lines = new StringBuilder();

append(lines, "com.jsoniter.CodegenAccess.resetExistingObject(iter);");

append(lines, "if (iter.readNull()) { return null; }");

append(lines, "if (!com.jsoniter.CodegenAccess.readArrayStart(iter)) {");

append(lines, "return new {{comp}}[0];");

append(lines, "}");

append(lines, "{{comp}} a1 = {{op}};");

append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");

append(lines, "return new {{comp}}[]{ a1 };");

append(lines, "}");

append(lines, "{{comp}} a2 = {{op}};");

append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");

append(lines, "return new {{comp}}[]{ a1, a2 };");

append(lines, "}");

append(lines, "{{comp}} a3 = {{op}};");

append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");

append(lines, "return new {{comp}}[]{ a1, a2, a3 };");

append(lines, "}");

append(lines, "{{comp}} a4 = ({{comp}}) {{op}};");

append(lines, "{{comp}}[] arr = new {{comp}}[8];");

append(lines, "arr[0] = a1;");

append(lines, "arr[1] = a2;");

append(lines, "arr[2] = a3;");

append(lines, "arr[3] = a4;");

append(lines, "int i = 4;");

append(lines, "while (com.jsoniter.CodegenAccess.nextToken(iter) == ',') {");

append(lines, "if (i == arr.length) {");

append(lines, "{{comp}}[] newArr = new {{comp}}[arr.length * 2];");

append(lines, "System.arraycopy(arr, 0, newArr, 0, arr.length);");

append(lines, "arr = newArr;");

append(lines, "}");

append(lines, "arr[i++] = {{op}};");

append(lines, "}");

// append(lines, "if (c != ']') { com.jsoniter.CodegenAccess.reportIncompleteArray(iter); }");

append(lines, "{{comp}}[] result = new {{comp}}[i];");

append(lines, "System.arraycopy(arr, 0, result, 0, i);");

append(lines, "return result;");

return lines.toString().replace(

"{{comp}}", compType.getCanonicalName()).replace(

"{{op}}", CodegenImplNative.genReadOp(compType));

}

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

if (WITH_CAPACITY_COLLECTION_CLASSES.contains(clazz)) {

return CodegenImplArray.genCollectionWithCapacity(clazz, typeArgs[0]);

} else {

return CodegenImplArray.genCollectionWithoutCapacity(clazz, typeArgs[0]);

}

}

private static String genCollectionWithCapacity(Class clazz, Type compType) {

StringBuilder lines = new StringBuilder();

append(lines, "{{clazz}} col = ({{clazz}})com.jsoniter.CodegenAccess.resetExistingObject(iter);");

append(lines, "if (iter.readNull()) { return null; }");

append(lines, "if (!com.jsoniter.CodegenAccess.readArrayStart(iter)) {");

append(lines, "return col == null ? new {{clazz}}(0): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");

append(lines, "}");

append(lines, "Object a1 = {{op}};");

append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");

append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(1): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");

append(lines, "obj.add(a1);");

append(lines, "return obj;");

append(lines, "}");

append(lines, "Object a2 = {{op}};");

append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");

append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(2): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");

append(lines, "obj.add(a1);");

append(lines, "obj.add(a2);");

append(lines, "return obj;");

append(lines, "}");

append(lines, "Object a3 = {{op}};");

append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");

append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(3): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");

append(lines, "obj.add(a1);");

append(lines, "obj.add(a2);");

append(lines, "obj.add(a3);");

append(lines, "return obj;");

append(lines, "}");

append(lines, "Object a4 = {{op}};");

append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(8): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");

append(lines, "obj.add(a1);");

append(lines, "obj.add(a2);");

append(lines, "obj.add(a3);");

append(lines, "obj.add(a4);");

append(lines, "while (com.jsoniter.CodegenAccess.nextToken(iter) == ',') {");

append(lines, "obj.add({{op}});");

append(lines, "}");

// append(lines, "if (c != ']') { com.jsoniter.CodegenAccess.reportIncompleteArray(iter); }");

append(lines, "return obj;");

return lines.toString().replace(

"{{clazz}}", clazz.getName()).replace(

"{{op}}", CodegenImplNative.genReadOp(compType));

}

private static String genCollectionWithoutCapacity(Class clazz, Type compType) {

StringBuilder lines = new StringBuilder();

append(lines, "if (iter.readNull()) { return null; }");

append(lines, "{{clazz}} col = ({{clazz}})com.jsoniter.CodegenAccess.resetExistingObject(iter);");

append(lines, "if (!com.jsoniter.CodegenAccess.readArrayStart(iter)) {");

append(lines, "return col == null ? new {{clazz}}(): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");

append(lines, "}");

append(lines, "Object a1 = {{op}};");

append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");

append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");

append(lines, "obj.add(a1);");

append(lines, "return obj;");

append(lines, "}");

append(lines, "Object a2 = {{op}};");

append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");

append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");

append(lines, "obj.add(a1);");

append(lines, "obj.add(a2);");

append(lines, "return obj;");

append(lines, "}");

append(lines, "Object a3 = {{op}};");

append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");

append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");

append(lines, "obj.add(a1);");

append(lines, "obj.add(a2);");

append(lines, "obj.add(a3);");

append(lines, "return obj;");

append(lines, "}");

append(lines, "Object a4 = {{op}};");

append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");

append(lines, "obj.add(a1);");

append(lines, "obj.add(a2);");

append(lines, "obj.add(a3);");

append(lines, "obj.add(a4);");

append(lines, "while (com.jsoniter.CodegenAccess.nextToken(iter) == ',') {");

append(lines, "obj.add({{op}});");

append(lines, "}");

// append(lines, "if (c != ']') { com.jsoniter.CodegenAccess.reportIncompleteArray(iter); }");

append(lines, "return obj;");

return lines.toString().replace(

"{{clazz}}", clazz.getName()).replace(

"{{op}}", CodegenImplNative.genReadOp(compType));

}

private static void append(StringBuilder lines, String str) {

lines.append(str);

lines.append("\n");

}

}