/*************************************************************************/
/*  resource_importer_ogg_vorbis.cpp                                     */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "resource_importer_ogg_vorbis.h"

#include "audio_stream_ogg_vorbis.h"
#include "core/io/file_access.h"
#include "core/io/resource_saver.h"
#include "scene/resources/texture.h"
#include "thirdparty/libogg/ogg/ogg.h"
#include "thirdparty/libvorbis/vorbis/codec.h"

String ResourceImporterOGGVorbis::get_importer_name() const {
	return "oggvorbisstr";
}

String ResourceImporterOGGVorbis::get_visible_name() const {
	return "oggvorbisstr";
}

void ResourceImporterOGGVorbis::get_recognized_extensions(List<String> *p_extensions) const {
	p_extensions->push_back("ogg");
}

String ResourceImporterOGGVorbis::get_save_extension() const {
	return "oggvorbisstr";
}

String ResourceImporterOGGVorbis::get_resource_type() const {
	return "AudioStreamOGGVorbis";
}

bool ResourceImporterOGGVorbis::get_option_visibility(const String &p_option, const Map<StringName, Variant> &p_options) const {
	return true;
}

int ResourceImporterOGGVorbis::get_preset_count() const {
	return 0;
}

String ResourceImporterOGGVorbis::get_preset_name(int p_idx) const {
	return String();
}

void ResourceImporterOGGVorbis::get_import_options(List<ImportOption> *r_options, int p_preset) const {
	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "loop"), true));
	r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "loop_offset"), 0));
}

Error ResourceImporterOGGVorbis::import(const String &p_source_file, const String &p_save_path, const Map<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files, Variant *r_metadata) {
	bool loop = p_options["loop"];
	float loop_offset = p_options["loop_offset"];

	FileAccess *f = FileAccess::open(p_source_file, FileAccess::READ);

	ERR_FAIL_COND_V_MSG(!f, ERR_CANT_OPEN, "Cannot open file '" + p_source_file + "'.");

	uint64_t len = f->get_length();

	Vector<uint8_t> file_data;
	file_data.resize(len);
	uint8_t *w = file_data.ptrw();

	f->get_buffer(w, len);

	memdelete(f);

	Ref<AudioStreamOGGVorbis> ogg_vorbis_stream;
	ogg_vorbis_stream.instantiate();

	Ref<OGGPacketSequence> ogg_packet_sequence;
	ogg_packet_sequence.instantiate();

	ogg_stream_state stream_state;
	ogg_sync_state sync_state;
	ogg_page page;
	ogg_packet packet;
	bool initialized_stream = false;

	ogg_sync_init(&sync_state);
	int err;
	size_t cursor = 0;
	size_t packet_count = 0;
	bool done = false;
	while (!done) {
		ERR_FAIL_COND_V_MSG((err = ogg_sync_check(&sync_state)), Error::ERR_INVALID_DATA, "Ogg sync error " + itos(err));
		while (ogg_sync_pageout(&sync_state, &page) != 1) {
			if (cursor >= len) {
				done = true;
				break;
			}
			ERR_FAIL_COND_V_MSG((err = ogg_sync_check(&sync_state)), Error::ERR_INVALID_DATA, "Ogg sync error " + itos(err));
			char *sync_buf = ogg_sync_buffer(&sync_state, OGG_SYNC_BUFFER_SIZE);
			ERR_FAIL_COND_V_MSG((err = ogg_sync_check(&sync_state)), Error::ERR_INVALID_DATA, "Ogg sync error " + itos(err));
			ERR_FAIL_COND_V(cursor > len, Error::ERR_INVALID_DATA);
			size_t copy_size = len - cursor;
			if (copy_size > OGG_SYNC_BUFFER_SIZE) {
				copy_size = OGG_SYNC_BUFFER_SIZE;
			}
			memcpy(sync_buf, &file_data[cursor], copy_size);
			ogg_sync_wrote(&sync_state, copy_size);
			cursor += copy_size;
			ERR_FAIL_COND_V_MSG((err = ogg_sync_check(&sync_state)), Error::ERR_INVALID_DATA, "Ogg sync error " + itos(err));
		}
		if (done) {
			break;
		}
		ERR_FAIL_COND_V_MSG((err = ogg_sync_check(&sync_state)), Error::ERR_INVALID_DATA, "Ogg sync error " + itos(err));

		// Have a page now.
		if (!initialized_stream) {
			ogg_stream_init(&stream_state, ogg_page_serialno(&page));
			ERR_FAIL_COND_V_MSG((err = ogg_stream_check(&stream_state)), Error::ERR_INVALID_DATA, "Ogg stream error " + itos(err));
			initialized_stream = true;
		}
		ERR_FAIL_COND_V_MSG((err = ogg_stream_check(&stream_state)), Error::ERR_INVALID_DATA, "Ogg stream error " + itos(err));
		ogg_stream_pagein(&stream_state, &page);
		ERR_FAIL_COND_V_MSG((err = ogg_stream_check(&stream_state)), Error::ERR_INVALID_DATA, "Ogg stream error " + itos(err));
		int desync_iters = 0;

		Vector<Vector<uint8_t>> packet_data;
		int64_t granule_pos = 0;

		while (true) {
			err = ogg_stream_packetout(&stream_state, &packet);
			if (err == -1) {
				// According to the docs this is usually recoverable, but don't sit here spinning forever.
				desync_iters++;
				ERR_FAIL_COND_V_MSG(desync_iters > 100, Error::ERR_INVALID_DATA, "Packet sync issue during ogg import");
				continue;
			} else if (err == 0) {
				// Not enough data to fully reconstruct a packet. Go on to the next page.
				break;
			}
			if (packet_count == 0 && vorbis_synthesis_idheader(&packet) == 0) {
				WARN_PRINT("Found a non-vorbis-header packet in a header position");
				// Clearly this logical stream is not a vorbis stream, so destroy it and try again with the next page.
				ogg_stream_destroy(&stream_state);
				initialized_stream = false;
				break;
			}
			granule_pos = packet.granulepos;

			PackedByteArray data;
			data.resize(packet.bytes);
			memcpy(data.ptrw(), packet.packet, packet.bytes);
			packet_data.push_back(data);
			packet_count++;
		}
		if (initialized_stream) {
			ogg_packet_sequence->push_page(granule_pos, packet_data);
		}
	}

	ogg_vorbis_stream->set_packet_sequence(ogg_packet_sequence);
	ogg_vorbis_stream->set_loop(loop);
	ogg_vorbis_stream->set_loop_offset(loop_offset);

	return ResourceSaver::save(p_save_path + ".oggvorbisstr", ogg_vorbis_stream);
}

ResourceImporterOGGVorbis::ResourceImporterOGGVorbis() {
}