#include "./ngc_ft1.h"

#include "ngc_ext_common.hpp"

#include <vector>
#include <cassert>

struct NGC_FT1 {
	NGC_FT1_options options;

};

static void _handle_FT1_REQUEST(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);
//static void _handle_FT1_INIT(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);
//static void _handle_FT1_INIT_ACK(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);
//static void _handle_FT1_DATA(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);
//static void _handle_FT1_DATA_ACK(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);
//static void _handle_FT1_DATA_FIN(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);
//static void _handle_FT1_DATA_FIN_ACK(Tox* tox, NGC_EXT_CTX* ngc_ext_ctx, uint32_t group_number, uint32_t peer_number, const uint8_t *data, size_t length);

bool NGC_FT1_init(NGC_EXT_CTX* ngc_ext_ctx, const struct NGC_FT1_options* options) {
	ngc_ext_ctx->ngc_ft1_ctx = new NGC_FT1;
	ngc_ext_ctx->ngc_ft1_ctx->options = *options;

	ngc_ext_ctx->callbacks[FT1_REQUEST] = _handle_FT1_REQUEST;
	ngc_ext_ctx->callbacks[FT1_INIT] = nullptr;
	ngc_ext_ctx->callbacks[FT1_INIT_ACK] = nullptr;
	ngc_ext_ctx->callbacks[FT1_DATA] = nullptr;
	ngc_ext_ctx->callbacks[FT1_DATA_ACK] = nullptr;
	ngc_ext_ctx->callbacks[FT1_DATA_FIN] = nullptr;
	ngc_ext_ctx->callbacks[FT1_DATA_FIN_ACK] = nullptr;
	//ngc_ext_ctx->callbacks[HS1_REQUEST_LAST_IDS] = _handle_HS1_REQUEST_LAST_IDS;
	//ngc_ext_ctx->callbacks[HS1_RESPONSE_LAST_IDS] = _handle_HS1_RESPONSE_LAST_IDS;

	return true;
}

void NGC_FT1_kill(NGC_EXT_CTX* ngc_ext_ctx) {
	delete ngc_ext_ctx->ngc_ft1_ctx;
	ngc_ext_ctx->ngc_ft1_ctx = nullptr;
}

// iterate

void NGC_FT1_request(
	Tox *tox, NGC_EXT_CTX* ngc_ext_ctx,

	uint32_t group_number,

	NGC_FT1_file_kind file_kind,

	const uint8_t* file_id,
	size_t file_id_size
) {
	// just call private for every peer in group?
	for (;;) {
		uint32_t peer_number = 0;
		NGC_FT1_request_private(tox, ngc_ext_ctx, group_number, peer_number, file_kind, file_id, file_id_size);
		assert(false && "not implemented");
	}
}

void NGC_FT1_request_private(
	Tox *tox, NGC_EXT_CTX* ngc_ext_ctx,

	uint32_t group_number,
	uint32_t peer_number,

	NGC_FT1_file_kind file_kind,

	const uint8_t* file_id,
	size_t file_id_size
) {
	assert(tox);
	assert(ngc_ext_ctx);
	assert(ngc_ext_ctx->ngc_ft1_ctx);

	// record locally that we sent(or want to send) the request?

	// - 1 byte packet id
	// - 1 byte (TODO: more?) file_kind
	// - X bytes file_id
	std::vector<uint8_t> pkg;
	pkg.push_back(FT1_REQUEST);
	pkg.push_back(file_kind);
	for (size_t i = 0; i < file_id_size; i++) {
		pkg.push_back(file_id[i]);
	}

	// lossless
	tox_group_send_custom_private_packet(tox, group_number, peer_number, true, pkg.data(), pkg.size(), nullptr);
}

#define _DATA_HAVE(x, error) if ((length - curser) < (x)) { error; }

static void _handle_FT1_REQUEST(
	Tox* tox,
	NGC_EXT_CTX* ngc_ext_ctx,

	uint32_t group_number,
	uint32_t peer_number,

	const uint8_t *data,
	size_t length
) {
	size_t curser = 0;

	// TODO: might be uint16_t or even larger
	uint8_t file_kind;
	_DATA_HAVE(sizeof(file_kind), fprintf(stderr, "packet too small, missing file_kind\n"); return)
	file_kind = data[curser++];

	fprintf(stderr, "got FT request with file_kind %u [", file_kind);
	for (; curser < length; curser++) {
		fprintf(stderr, "%02X", data[curser]);
	}
	fprintf(stderr, "]\n");
}

#undef _DATA_HAVE