#include "util.js.h"

#include "task.h"

static JSValue _util_utf8_decode(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv)
{
	JSValue result = JS_NULL;
	size_t length;
	if (JS_IsString(argv[0]))
	{
		result = JS_DupValue(context, argv[0]);
	}
	else
	{
		uint8_t* array = tf_util_try_get_array_buffer(context, &length, argv[0]);
		if (array)
		{
			result = JS_NewStringLen(context, (const char*)array, length);
		}
		else
		{
			size_t offset;
			size_t element_size;
			JSValue buffer = tf_util_try_get_typed_array_buffer(context, argv[0], &offset, &length, &element_size);
			size_t size;
			if (!JS_IsException(buffer))
			{
				array = tf_util_try_get_array_buffer(context, &size, buffer);
				if (array)
				{
					result = JS_NewStringLen(context, (const char*)array, size);
				}
			}
			JS_FreeValue(context, buffer);
		}
	}
	return result;
}

JSValue tf_util_utf8_decode(JSContext* context, JSValue value)
{
	return _util_utf8_decode(context, JS_NULL, 1, &value);
}

uint8_t* tf_util_try_get_array_buffer(JSContext *ctx, size_t *psize, JSValueConst obj)
{
	uint8_t* result = JS_GetArrayBuffer(ctx, psize, obj);
	JS_FreeValue(ctx, JS_GetException(ctx));
	return result;
}

JSValue tf_util_try_get_typed_array_buffer(JSContext *ctx, JSValueConst obj, size_t *pbyte_offset, size_t *pbyte_length, size_t *pbytes_per_element)
{
	JSValue result = JS_GetTypedArrayBuffer(ctx, obj, pbyte_offset, pbyte_length, pbytes_per_element);
	JS_FreeValue(ctx, JS_GetException(ctx));
	return result;
}

JSValue _util_print(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv)
{
	tf_task_t* task = JS_GetContextOpaque(context);
	if (task)
	{
		printf("Task[%p:%s]>", task, tf_task_get_name(task));
	}
	for (int i = 0; i < argc; ++i)
	{
		if (JS_IsNull(argv[i]))
		{
			printf(" null");
		}
		else
		{
			const char* value = JS_ToCString(context, argv[i]);
			printf(" %s", value);
			JS_FreeCString(context, value);
		}
	}
	printf("\n");
	return JS_NULL;
}

void tf_util_register(JSContext* context)
{
	JSValue global = JS_GetGlobalObject(context);
	JS_SetPropertyStr(context, global, "utf8Decode", JS_NewCFunction(context, _util_utf8_decode, "utf8Decode", 1));
	JS_SetPropertyStr(context, global, "print", JS_NewCFunction(context, _util_print, "print", 1));
	JS_FreeValue(context, global);
}