#include "okapi.h"
#include "cache.h"
#include "debug.h"

#include <iostream>
#include <vector>

#include <curl/curl.h>
#include <nlohmann/json.hpp>

using json = nlohmann::json;

static const std::string OKAPI_logs = "services/logs/userlogs";
static const std::string OKAPI_cache = "services/caches/geocache";
static const std::string OKAPI_caches = "services/caches/geocaches";
static const std::string OKAPI_username = "services/users/by_username";

size_t Okapi::write_cb(char* ptr, size_t size, size_t nmemb, void* userdata) {
	std::string* str = reinterpret_cast<std::string*>(userdata);
	str->append(ptr, nmemb);
	return nmemb;
}

std::string Okapi::curl_post(std::string url, std::string post) {
	CURL* curl;
	CURLcode res;

	std::string output;

	Debug(5) << "API query: " << post;

	curl = curl_easy_init();
	if (!curl) {
		curl_global_cleanup();
		throw 0;
	}

	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
	curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post.c_str());
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_cb);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)&output);

	res = curl_easy_perform(curl);
	if (res != CURLE_OK) {
		Debug(1) << "curl_easy_perform() failed: " << curl_easy_strerror(res) << '\n';
		curl_easy_cleanup(curl);
		std::exit(EXIT_FAILURE);
	}
	curl_easy_cleanup(curl);

	Debug(5) << "API query result: " << output;
	if (output.starts_with("{\"error\"")) {
		json j = json::parse(output);
		Debug(1) << "OKAPI error: " << j["error"]["developer_message"];
		std::exit(EXIT_FAILURE);
	}
	return output;
}

std::string Okapi::get_user_caches_json(std::string uuid, int count, int offset) {
	std::string service = url + OKAPI_logs;
	std::string query = "consumer_key=" + key + "&user_uuid=" + uuid + "&fields=cache_code|type&limit=" + std::to_string(count) + "&offset=" + std::to_string(offset);
	return curl_post(service, query);
}

// std::string Okapi::get_cache_json(std::string code) {
// 	std::string service = url + OKAPI_cache;
// 	std::string query = "consumer_key=" + key + "&cache_code=" + code + "&fields=code|name|location|type|status|difficulty|terrain";
// 	return curl_post(service, query);
// }

std::string Okapi::get_caches_json(std::string codes) {
	std::string service = url + OKAPI_caches;
	std::string query = "consumer_key=" + key + "&cache_codes=" + codes + "&fields=code|name|location|type|status|difficulty|terrain";
	return curl_post(service, query);
}

// Cache Okapi::get_cache(std::string code) {
// 	std::string output = get_cache_json(code);
// 	json j = json::parse(output);
//
// 	Cache c;
// 	c.code = code;
// 	c.name = j["name"];
// 	c.type = j["type"];
// 	c.diff = j["difficulty"].get<float>();
// 	c.terr = j["terrain"].get<float>();
// // 	std::cout << j["difficulty"] << '\n';
// // 	std::cout << j["difficulty"].get<float>() << '\n';
// // 	std::cout << j["difficulty"].get<double>() << '\n';
// // 	std::cout << j["difficulty"].get<int>() << '\n';
//
// 	std::string loc = j["location"];
// 	int pos = loc.find("|");
// 	c.pos.lat = stof(loc.substr(0, pos));
// 	c.pos.lon = stof(loc.substr(pos + 1));
//
// 	return c;
// }

Caches Okapi::get_caches(std::vector<std::string> codes) {
	Caches cc;
	Cache c;

	while (codes.size() > 0) {
		std::string codes_list;
		int n = (codes.size() > 500) ? 500 : codes.size();
		for (int i = 0; i < n; i++) {
			codes_list += codes.back();
			codes_list += '|';
			codes.pop_back();
		}
		codes_list.pop_back(); // remove trailing '|'

		std::string output = get_caches_json(codes_list);
		json j = json::parse(output);

		for (auto& el : j.items()) {
			c.code = el.value()["code"];
			c.name = el.value()["name"];
			c.type = el.value()["type"];
			c.diff = el.value()["difficulty"];
			c.terr = el.value()["terrain"];
			;
			std::string loc = el.value()["location"];
			int pos = loc.find("|");
			c.pos.lat = stof(loc.substr(0, pos));
			c.pos.lon = stof(loc.substr(pos + 1));
			c.origin = ocpl;
			cc.insert(c);
		}
	}
	return cc;
}

Caches Okapi::get_user_caches(std::string uuid, int count) {
	Caches cc;
	std::vector<std::string> codes;
	json j;

	int off = 0;

	if (count == 0)
		do {
			std::string output = get_user_caches_json(uuid, 1000, off);
			j = json::parse(output);

			for (auto& el : j.items()) {
				if (el.value()["type"] == "Found it") {
					codes.emplace_back(el.value()["cache_code"]);
				}
			}
			off += j.size();
		} while (j.size() > 0);
	else {
		int count_req = (count > 1000) ? 1000 : count;
		do {
			std::string output = get_user_caches_json(uuid, count_req, off);
			j = json::parse(output);

			for (auto& el : j.items()) {
				if (el.value()["type"] == "Found it") {
					codes.emplace_back(el.value()["cache_code"]);
				}
			}
			off += j.size();
			count -= count_req;
		} while (j.size() > 0 && count > 0);
	}

	// Debug(3) << codes;
	cc = get_caches(codes);
	Debug(2) << "Caches read from OC: " << cc.size() << '\n';
	return cc;
}

std::string Okapi::get_uuid(std::string username) {
	std::string service = url + OKAPI_username;
	std::string query = "consumer_key=" + key + "&username=" + username + "&fields=uuid";
	json j = json::parse(curl_post(service, query));
	return j["uuid"];
}