package license.sdk;

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public final class LicenseClient {
    public static final class ApiResponse {
        private final int statusCode;
        private final String body;

        private ApiResponse(int statusCode, String body) {
            this.statusCode = statusCode;
            this.body = body;
        }

        public int statusCode() { return statusCode; }
        public String body() { return body; }
    }

    private final HttpClient http = HttpClient.newHttpClient();
    private final String baseUrl;
    private final String machineCode;

    public LicenseClient(String baseUrl, String machineCode) {
        this.baseUrl = baseUrl.replaceAll("/$", "");
        this.machineCode = machineCode.trim().toUpperCase();
    }

    public String login(String cardKey, String deviceName) throws IOException, InterruptedException {
        return loginResponse(cardKey, deviceName).body();
    }

    public String heartbeat(String cardKey) throws IOException, InterruptedException { return heartbeatResponse(cardKey).body(); }
    public String listDevices(String cardKey) throws IOException, InterruptedException { return listDevicesResponse(cardKey).body(); }
    public String unbind(String cardKey) throws IOException, InterruptedException { return unbindResponse(cardKey).body(); }

    public ApiResponse loginResponse(String cardKey, String deviceName) throws IOException, InterruptedException {
        return post("/api/card/verify", "{\"cardKey\":\"" + escape(cardKey) + "\",\"machineCode\":\"" + machineCode + "\",\"deviceName\":\"" + escape(deviceName == null ? "" : deviceName) + "\"}");
    }

    public ApiResponse heartbeatResponse(String cardKey) throws IOException, InterruptedException { return post("/api/card/heartbeat", request(cardKey)); }
    public ApiResponse listDevicesResponse(String cardKey) throws IOException, InterruptedException { return post("/api/card/devices", request(cardKey)); }
    public ApiResponse unbindResponse(String cardKey) throws IOException, InterruptedException { return post("/api/card/unbind", request(cardKey)); }

    private String request(String cardKey) { return "{\"cardKey\":\"" + escape(cardKey) + "\",\"machineCode\":\"" + machineCode + "\"}"; }
    private ApiResponse post(String path, String body) throws IOException, InterruptedException {
        HttpRequest request = HttpRequest.newBuilder(URI.create(baseUrl + path)).header("Content-Type", "application/json").POST(HttpRequest.BodyPublishers.ofString(body)).build();
        HttpResponse<String> response = http.send(request, HttpResponse.BodyHandlers.ofString());
        return new ApiResponse(response.statusCode(), response.body());
    }
    private String escape(String value) { return value == null ? "" : value.replace("\\", "\\\\").replace("\"", "\\\""); }
}