var Azure = {
	params: {},
	token: null,

	setParams: function (params) {
		['app_id', 'password', 'tenant_id', 'subscription_id'].forEach(function (field) {
			if (typeof params !== 'object' || typeof params[field] === 'undefined' || params[field] === '') {
				throw 'Required param is not set: ' + field + '.';
			}
		});

		Azure.params = params;
	},

	request: function (url, data) {
		if (typeof data === 'undefined' || data === null) {
			data = '';
		}
		var response, request = new HttpRequest();
		if (typeof Azure.params.proxy !== 'undefined' && Azure.params.proxy !== '') {
			request.setProxy(Azure.params.proxy);
		}
		if (Azure.token) {
			request.addHeader('Accept: application/json');
			request.addHeader('Authorization: Bearer ' + Azure.token);
		}

		Zabbix.log(4, '[ Azure ] Sending request: ' + url);

		if (data !== '') {
			request.addHeader('Content-Type: application/x-www-form-urlencoded');
			response = request.post(url, data);
		}
		else {
			response = request.get(url);
		}

		Zabbix.log(4, '[ Azure ] Received response with status code ' + request.getStatus() + ': ' + response);

		if (request.getStatus() !== 200 || response === null) {
			throw 'Request failed with status code ' + request.getStatus() + ': ' + response;
		}

		try {
			return JSON.parse(response);
		}
		catch (error) {
			throw 'Failed to parse response received from API.';
		}
	},

	nextlink: function (data) {
		next_data = data;
		while ('nextLink' in next_data) {
			next_data = Azure.request(next_data.nextLink);
			next_data.value.forEach(function (value) {
				data.value.push(value);
			});
		}

		return data;
	}
};

var result,
	data = {},
	types = [
		{"method": "Microsoft.Compute/virtualMachines", "version": "2022-03-01"},
		{"method": "Microsoft.DBforMySQL/flexibleServers", "version": "2021-05-01"},
		{"method": "Microsoft.DBforMySQL/servers", "version": "2017-12-01"},
		{"method": "Microsoft.DBforPostgreSQL/flexibleServers", "version": "2021-06-01"},
		{"method": "Microsoft.DBforPostgreSQL/servers", "version": "2017-12-01"},
		{"method": "Microsoft.Sql/servers", "version": "2022-05-01-preview"},
		{"method": "Microsoft.DocumentDB/databaseAccounts", "version": "2022-11-15-preview"},
		{"method": "Microsoft.Compute/virtualMachineScaleSets", "version": "2024-03-01"}
	];
	data['errors'] = {},
	data['resources'] = {};
	data.resources.value = [];

try {
	Azure.setParams(JSON.parse(value));

	try {
		result = Azure.request(
			'https://login.microsoftonline.com/' + encodeURIComponent(Azure.params.tenant_id) + '/oauth2/token',
			'grant_type=client_credentials&resource=' + encodeURIComponent('https://management.azure.com/') + '&client_id=' + encodeURIComponent(Azure.params.app_id) + '&client_secret=' + encodeURIComponent(Azure.params.password)
		);

		if ('access_token' in result) {
			Azure.token = result['access_token'];
		} else {
			throw 'Auth response does not contain access token.';
		}
	}
	catch (error) {
		data.errors.auth = error.toString();
	}

	if (!('auth' in data.errors)) {
		try {
			for (var i in types) {
				if (types[i].method === "Microsoft.Sql/servers") {
					mssql_servers = Azure.request('https://management.azure.com/subscriptions/' + encodeURIComponent(Azure.params.subscription_id) + '/providers/' + types[i].method + '?api-version=' + types[i].version);

					if ('nextLink' in mssql_servers) {
						mssql_servers = Azure.nextlink(mssql_servers);
					}

					if ('value' in mssql_servers && mssql_servers.value.length > 0) {
						for (j in mssql_servers.value) {
							mssql_dbs = Azure.request('https://management.azure.com' + mssql_servers.value[j].id + '/databases?api-version=' + types[i].version);

							if ('nextLink' in mssql_dbs) {
								mssql_dbs = Azure.nextlink(mssql_dbs);
							}

							mssql_dbs.value.forEach(function (value) {
								raw_data.value.push(value);
							});
						}
					}
				}
				else {
					raw_data = Azure.request('https://management.azure.com/subscriptions/' + encodeURIComponent(Azure.params.subscription_id) + '/providers/' + types[i].method + '?api-version=' + types[i].version);

					if ('nextLink' in raw_data) {
						raw_data = Azure.nextlink(raw_data);
					}
				}

				raw_data.value.forEach(function (value) {
					value.resourceGroup = value.id.split("/")[4];
					data.resources.value.push(value);
				});
			}
		}
		catch (error) {
			data.errors.resources = error.toString();
		}
	}
}
catch (error) {
	data.errors.params = error.toString();
}

if (Object.keys(data.errors).length !== 0) {
	errors = 'Failed to receive data:';
	for (var error in data.errors) {
		errors += '\\n' + error + ' : ' + data.errors[error];
	}
	data.errors = errors;
}
else {
	data.errors = '';
}

return JSON.stringify(data);