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public class Database {
private Sqlite.Database db;
private Sqlite.Statement insert_stmt;
private Sqlite.Statement product_stmt;
private Sqlite.Statement undo_stmt;
private Sqlite.Statement stock_stmt1;
private Sqlite.Statement stock_stmt2;
uint64 user = 0;
uint64 product = 0;
bool logged_in = false;
bool stock_mode = false;
private static string insert_query = "INSERT INTO purchases ('user', 'product', 'timestamp') VALUES (?, ?, ?)";
private static string product_query = "SELECT name FROM products WHERE id = ?";
private static string undo_query = "DELETE FROM purchases WHERE user = ? ORDER BY 'timestamp' DESC LIMIT 1";
private static string stock_query1 = "INSERT INTO restock ('user', 'product', 'amount', 'timestamp') VALUES (?, ?, ?, ?)";
private static string stock_query2 = "UPDATE products SET amount = amount + ? WHERE id = ?";
public Database(string file) {
int rc;
rc = Sqlite.Database.open (file, out db);
if(rc != Sqlite.OK) {
error("could not open database!");
}
rc = this.db.prepare_v2(insert_query, -1, out insert_stmt);
if(rc != Sqlite.OK) {
error("could not prepare insert statement!");
}
rc = this.db.prepare_v2(product_query, -1, out product_stmt);
if(rc != Sqlite.OK) {
error("could not prepare article statement!");
}
rc = this.db.prepare_v2(undo_query, -1, out undo_stmt);
if(rc != Sqlite.OK) {
error("could not prepare undo statement!");
}
rc = this.db.prepare_v2(stock_query1, -1, out stock_stmt1);
if(rc != Sqlite.OK) {
error("could not prepare first stock statement!");
}
rc = this.db.prepare_v2(stock_query2, -1, out stock_stmt2);
if(rc != Sqlite.OK) {
error("could not prepare second stock statement!");
}
}
public bool login(uint64 id) {
this.user = id;
this.logged_in = true;
return true;
}
public bool logout() {
this.user = 0;
this.logged_in = false;
return true;
}
public bool buy(uint64 article) {
if(is_logged_in()) {
int64 timestamp = (new DateTime.now_utc()).to_unix();
this.insert_stmt.reset();
this.insert_stmt.bind_text(1, "%llu".printf(user));
this.insert_stmt.bind_text(2, "%llu".printf(article));
this.insert_stmt.bind_text(3, "%llu".printf(timestamp));
int rc = this.insert_stmt.step();
if(rc != Sqlite.DONE)
error("[interner Fehler: %d]".printf(rc));
else
return true;
} else {
return false;
}
}
public string get_product_name(uint64 article) {
this.product_stmt.reset();
this.product_stmt.bind_text(1, "%llu".printf(article));
int rc = this.product_stmt.step();
switch(rc) {
case Sqlite.ROW:
return this.product_stmt.column_text(0);
case Sqlite.DONE:
return "unbekanntes Produkt: %llu".printf(article);
default:
return "[interner Fehler: %d]".printf(rc);
}
}
public bool undo() {
if(is_logged_in()) {
this.undo_stmt.reset();
this.undo_stmt.bind_text(1, "%llu".printf(user));
int rc = this.undo_stmt.step();
if(rc != Sqlite.DONE)
error("[interner Fehler: %d]".printf(rc));
else
return true;
}
return false;
}
public bool choose_stock_product(uint64 id) {
if(is_in_stock_mode()) {
product = id;
return true;
}
return false;
}
public bool add_stock_product(uint64 amount) {
if(is_in_stock_mode() && product != 0) {
int rc = 0;
int64 timestamp = (new DateTime.now_utc()).to_unix();
this.stock_stmt1.reset();
this.stock_stmt1.bind_text(1, "%llu".printf(user));
this.stock_stmt1.bind_text(2, "%llu".printf(product));
this.stock_stmt1.bind_text(3, "%llu".printf(amount));
this.stock_stmt1.bind_text(4, "%llu".printf(timestamp));
rc = this.stock_stmt1.step();
if(rc != Sqlite.DONE)
error("[interner Fehler: %d]".printf(rc));
this.stock_stmt2.reset();
this.stock_stmt2.bind_text(1, "%llu".printf(amount));
this.stock_stmt2.bind_text(2, "%llu".printf(product));
rc = this.stock_stmt2.step();
if(rc != Sqlite.DONE)
error("[interner Fehler: %d]".printf(rc));
return true;
}
return false;
}
public bool go_into_stock_mode() {
if(is_logged_in())
stock_mode = true;
return stock_mode;
}
public bool is_logged_in() {
return this.logged_in;
}
public bool is_in_stock_mode() {
return this.stock_mode;
}
}
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