refactor scanner session code

1 files changed, 148 insertions, 0 deletions

diff --git a/src/scannersession.vala b/src/scannersession.vala
new file mode 100644
index 0000000..e286387
--- /dev/null
+++ b/src/scannersession.vala
@@ -0,0 +1,148 @@
+/* Copyright 2012, Sebastian Reichel <sre@ring0.de>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+public class ScannerSession {
+	public int user {
+		get;
+		private set;
+		default = 0;
+	}
+	public string name {
+		get;
+		private set;
+		default = "Guest";
+	}
+	public bool logged_in {
+		get;
+		private set;
+		default = false;
+	}
+	public bool disabled {
+		get;
+		private set;
+		default = false;
+	}
+
+	public void logout() {
+		logged_in = false;
+	}
+
+	public bool login(int user) {
+		this.user      = user;
+		try {
+			this.name      = db.get_username(user);
+			this.disabled  = db.get_user_auth(user).disabled;
+		} catch(WebSessionError e) {
+			return false;
+		}
+		this.logged_in = true;
+
+		return true;
+	}
+
+	public ScannerSession() {
+	}
+
+	public bool interpret(string scannerdata) {
+		if(scannerdata.has_prefix("USER ")) {
+			string str_id = scannerdata.substring(5);
+			int32 id = int.parse(str_id);
+
+			/* check if scannerdata has valid format */
+			if(scannerdata != "USER %d".printf(id)) {
+				audio.play("system/error.ogg");
+				write_to_log("Error: Invalid User ID: %s", scannerdata);
+				return false;
+			}
+
+			if(logged_in) {
+				write_to_log("Warning: Last user forgot to logout");
+				logout();
+			}
+
+			if(login(id)) {
+				/* TODO: play audio */
+				write_to_log("Login: %s (%d)", name, user);
+				return true;
+			} else {
+				audio.play("system/error.ogg");
+				write_to_log("Error: Login failed (User ID = %d)", id);
+				return false;
+			}
+		} else if(scannerdata == "GUEST") {
+			if(logged_in) {
+				write_to_log("Warning: Last user forgot to logout");
+				logout();
+			}
+
+			if(login(0)) {
+				/* TODO: play audio */
+				write_to_log("Login: %s (%d)", name, user);
+				return true;
+			} else {
+				audio.play("system/error.ogg");
+				write_to_log("Error: Login failed (User ID = 0)");
+				return false;
+			}
+		} else if(scannerdata == "UNDO") {
+			if(!logged_in) {
+				audio.play("system/error.ogg");
+				write_to_log("Error: Can't undo if not logged in!");
+				return false;
+			} else {
+				if(db.undo(user)) {
+					/* TODO: play audio */
+					write_to_log("Undo last purchase!");
+					return true;
+				} else {
+					/* TODO: play audio */
+					write_to_log("Error: Couldn't undo last purchase!");
+					return false;
+				}
+			}
+		} else if(scannerdata == "LOGOUT") {
+			if(logged_in) {
+				/* TODO: play audio */
+				write_to_log("Logout!");
+				logout();
+				return true;
+			}
+
+			return false;
+		} else {
+			uint64 id = uint64.parse(scannerdata);
+
+			/* check if scannerdata has valid format */
+			if(scannerdata != "%llu".printf(id)) {
+				/* TODO: play audio */
+				write_to_log("Error: invalid product: %s", scannerdata);
+				return false;
+			}
+
+			if(db.buy(user, id)) {
+				/* TODO: play audio */
+				var name  = db.get_product_name(id);
+				var price = db.get_product_price(user, id);
+				write_to_log(@"article bought: $name ($price €)");
+				return true;
+			} else {
+				/* TODO: play audio */
+				write_to_log("Error: purchase failed!");
+				return false;
+			}
+		}
+	}
+}
+