/**
 * @file
 * @brief Source file for Bars effect class
 * @author Jonathan Thomas <jonathan@openshot.org>
 *
 * @ref License
 */

// Copyright (c) 2008-2019 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later

#include "Bars.h"
#include "Exceptions.h"

#include <cstring>

using namespace openshot;

namespace {
double clamp_margin(double value) {
	if (value < 0.0)
		return 0.0;
	if (value > 1.0)
		return 1.0;
	return value;
}
}

/// Blank constructor, useful when using Json to load the effect properties
Bars::Bars() : color("#000000"), left(0.0), top(0.1), right(0.0), bottom(0.1) {
	// Init effect properties
	init_effect_details();
}

// Default constructor
Bars::Bars(Color color, Keyframe left, Keyframe top, Keyframe right, Keyframe bottom) :
		color(color), left(left), top(top), right(right), bottom(bottom)
{
	// Init effect properties
	init_effect_details();
}

// Init effect settings
void Bars::init_effect_details()
{
	/// Initialize the values of the EffectInfo struct.
	InitEffectInfo();

	/// Set the effect info
	info.class_name = "Bars";
	info.name = "Bars";
	info.description = "Add colored bars around your video.";
	info.has_audio = false;
	info.has_video = true;
}

// This method is required for all derived classes of EffectBase, and returns a
// modified openshot::Frame object
std::shared_ptr<openshot::Frame> Bars::GetFrame(std::shared_ptr<openshot::Frame> frame, int64_t frame_number)
{
	// Get the frame's image
	std::shared_ptr<QImage> frame_image = frame->GetImage();
	const int width = frame_image->width();
	const int height = frame_image->height();
	if (width <= 0 || height <= 0)
		return frame;

	// Get bar color (and create small color image)
	auto tempColor = std::make_shared<QImage>(
		width, 1, QImage::Format_RGBA8888_Premultiplied);
	tempColor->fill(QColor(QString::fromStdString(color.GetColorHex(frame_number))));

	// Get current keyframe values
	double left_value = left.GetValue(frame_number);
	double top_value = top.GetValue(frame_number);
	double right_value = right.GetValue(frame_number);
	double bottom_value = bottom.GetValue(frame_number);

	// Get pixel array pointer
	unsigned char *pixels = (unsigned char *) frame_image->bits();
	unsigned char *color_pixels = (unsigned char *) tempColor->bits();

	// Get pixels sizes of all bars
	int top_bar_height = clamp_margin(top_value) * height;
	int bottom_bar_height = clamp_margin(bottom_value) * height;
	int left_bar_width = clamp_margin(left_value) * width;
	int right_bar_width = clamp_margin(right_value) * width;

	// Loop through rows
	for (int row = 0; row < height; row++) {

		// Top & Bottom Bar
		if ((top_bar_height > 0.0 && row <= top_bar_height) || (bottom_bar_height > 0.0 && row >= height - bottom_bar_height)) {
			memcpy(&pixels[row * width * 4], color_pixels, sizeof(char) * width * 4);
		} else {
			// Left Bar
			if (left_bar_width > 0.0) {
				memcpy(&pixels[row * width * 4], color_pixels, sizeof(char) * left_bar_width * 4);
			}

			// Right Bar
			if (right_bar_width > 0.0) {
				memcpy(&pixels[((row * width) + (width - right_bar_width)) * 4], color_pixels, sizeof(char) * right_bar_width * 4);
			}
		}
	}

	// Cleanup colors and arrays
	tempColor.reset();

	// return the modified frame
	return frame;
}

// Generate JSON string of this object
std::string Bars::Json() const {

	// Return formatted string
	return JsonValue().toStyledString();
}

// Generate Json::Value for this object
Json::Value Bars::JsonValue() const {

	// Create root json object
	Json::Value root = EffectBase::JsonValue(); // get parent properties
	root["type"] = info.class_name;
	root["color"] = color.JsonValue();
	root["left"] = left.JsonValue();
	root["top"] = top.JsonValue();
	root["right"] = right.JsonValue();
	root["bottom"] = bottom.JsonValue();

	// return JsonValue
	return root;
}

// Load JSON string into this object
void Bars::SetJson(const std::string value) {

	// Parse JSON string into JSON objects
	try
	{
		const Json::Value root = openshot::stringToJson(value);
		// Set all values that match
		SetJsonValue(root);
	}
	catch (const std::exception& e)
	{
		// Error parsing JSON (or missing keys)
		throw InvalidJSON("JSON is invalid (missing keys or invalid data types)");
	}
}

// Load Json::Value into this object
void Bars::SetJsonValue(const Json::Value root) {

	// Set parent data
	EffectBase::SetJsonValue(root);

	// Set data from Json (if key is found)
	if (!root["color"].isNull())
		color.SetJsonValue(root["color"]);
	if (!root["left"].isNull())
		left.SetJsonValue(root["left"]);
	if (!root["top"].isNull())
		top.SetJsonValue(root["top"]);
	if (!root["right"].isNull())
		right.SetJsonValue(root["right"]);
	if (!root["bottom"].isNull())
		bottom.SetJsonValue(root["bottom"]);
}

// Get all properties for a specific frame
std::string Bars::PropertiesJSON(int64_t requested_frame) const {

	// Generate JSON properties list
	Json::Value root = BasePropertiesJSON(requested_frame);

	// Keyframes
	root["color"] = add_property_json("Bar Color", 0.0, "color", "", &color.red, 0, 255, false, requested_frame);
	root["color"]["red"] = add_property_json("Red", color.red.GetValue(requested_frame), "float", "", &color.red, 0, 255, false, requested_frame);
	root["color"]["blue"] = add_property_json("Blue", color.blue.GetValue(requested_frame), "float", "", &color.blue, 0, 255, false, requested_frame);
	root["color"]["green"] = add_property_json("Green", color.green.GetValue(requested_frame), "float", "", &color.green, 0, 255, false, requested_frame);
	root["left"] = add_property_json("Margin: Left", left.GetValue(requested_frame), "float", "", &left, 0.0, 0.5, false, requested_frame);
	root["top"] = add_property_json("Margin: Top", top.GetValue(requested_frame), "float", "", &top, 0.0, 0.5, false, requested_frame);
	root["right"] = add_property_json("Margin: Right", right.GetValue(requested_frame), "float", "", &right, 0.0, 0.5, false, requested_frame);
	root["bottom"] = add_property_json("Margin: Bottom", bottom.GetValue(requested_frame), "float", "", &bottom, 0.0, 0.5, false, requested_frame);

	// Return formatted string
	return root.toStyledString();
}
