#include "Utils.h"

#include "WSRequestHandler.h"

/**
* @typedef {Object} `Scene`
* @property {String} `name` Name of the currently active scene.
* @property {Array<SceneItem>} `sources` Ordered list of the current scene's source items.
*/

/**
 * Switch to the specified scene.
 *
 * @param {String} `scene-name` Name of the scene to switch to.
 *
 * @api requests
 * @name SetCurrentScene
 * @category scenes
 * @since 0.3
 */
HandlerResponse WSRequestHandler::HandleSetCurrentScene(WSRequestHandler* req) {
	if (!req->hasField("scene-name")) {
		return req->SendErrorResponse("missing request parameters");
	}

	const char* sceneName = obs_data_get_string(req->data, "scene-name");
	OBSSourceAutoRelease source = obs_get_source_by_name(sceneName);

	if (source) {
		obs_frontend_set_current_scene(source);
		return req->SendOKResponse();
	} else {
		return req->SendErrorResponse("requested scene does not exist");
	}
}

/**
 * Get the current scene's name and source items.
 * 
 * @return {String} `name` Name of the currently active scene.
 * @return {Array<SceneItem>} `sources` Ordered list of the current scene's source items.
 *
 * @api requests
 * @name GetCurrentScene
 * @category scenes
 * @since 0.3
 */
HandlerResponse WSRequestHandler::HandleGetCurrentScene(WSRequestHandler* req) {
	OBSSourceAutoRelease currentScene = obs_frontend_get_current_scene();
	OBSDataArrayAutoRelease sceneItems = Utils::GetSceneItems(currentScene);

	OBSDataAutoRelease data = obs_data_create();
	obs_data_set_string(data, "name", obs_source_get_name(currentScene));
	obs_data_set_array(data, "sources", sceneItems);

	return req->SendOKResponse(data);
}

/**
 * Get a list of scenes in the currently active profile.
 * 
 * @return {String} `current-scene` Name of the currently active scene.
 * @return {Array<Scene>} `scenes` Ordered list of the current profile's scenes (See `[GetCurrentScene](#getcurrentscene)` for more information).
 *
 * @api requests
 * @name GetSceneList
 * @category scenes
 * @since 0.3
 */
HandlerResponse WSRequestHandler::HandleGetSceneList(WSRequestHandler* req) {
	OBSSourceAutoRelease currentScene = obs_frontend_get_current_scene();
	OBSDataArrayAutoRelease scenes = Utils::GetScenes();

	OBSDataAutoRelease data = obs_data_create();
	obs_data_set_string(data, "current-scene",
		obs_source_get_name(currentScene));
	obs_data_set_array(data, "scenes", scenes);

	return req->SendOKResponse(data);
}

/**
* Changes the order of scene items in the requested scene.
*
* @param {String (optional)} `scene` Name of the scene to reorder (defaults to current).
* @param {Array<Scene>} `items` Ordered list of objects with name and/or id specified. Id preferred due to uniqueness per scene
* @param {int (optional)} `items[].id` Id of a specific scene item. Unique on a scene by scene basis.
* @param {String (optional)} `items[].name` Name of a scene item. Sufficiently unique if no scene items share sources within the scene.
*
* @api requests
* @name ReorderSceneItems
* @category scenes
* @since 4.5.0
*/
HandlerResponse WSRequestHandler::HandleReorderSceneItems(WSRequestHandler* req) {
	QString sceneName = obs_data_get_string(req->data, "scene");
	OBSSourceAutoRelease scene = Utils::GetSceneFromNameOrCurrent(sceneName);
	if (!scene) {
		return req->SendErrorResponse("requested scene doesn't exist");
	}

	OBSDataArrayAutoRelease items = obs_data_get_array(req->data, "items");
	if (!items) {
		return req->SendErrorResponse("sceneItem order not specified");
	}

	size_t count = obs_data_array_count(items);

	std::vector<obs_sceneitem_t*> newOrder;
	newOrder.reserve(count);

	for (size_t i = 0; i < count; ++i) {
		OBSDataAutoRelease item = obs_data_array_item(items, i);

		OBSSceneItemAutoRelease sceneItem = Utils::GetSceneItemFromItem(scene, item);
		obs_sceneitem_release(sceneItem); // ref dec

		if (!sceneItem) {
			return req->SendErrorResponse("Invalid sceneItem id or name specified");
		}
		
		for (size_t j = 0; j <= i; ++j) {
			if (sceneItem == newOrder[j]) {
				return req->SendErrorResponse("Duplicate sceneItem in specified order");
			}
		}

		newOrder.push_back(sceneItem);
	}

	bool success = obs_scene_reorder_items(obs_scene_from_source(scene), newOrder.data(), count);
	if (!success) {
		return req->SendErrorResponse("Invalid sceneItem order");
	}

	for (auto const& item: newOrder) {
		obs_sceneitem_release(item);
	}

	return req->SendOKResponse();
}