Add initial data tables (#2)

src/lib/Data.php

@@ -0,0 +1,62 @@
+<?php
+/**
+ * A centralized place for data access for the application
+ */
+class Data {
+
+    /**
+     * Obtain a new connection to the database
+     * @return SQLite3 A new connection to the database
+     */
+    private static function getConnection(): SQLite3 {
+        $db = new SQLite3("../data/{${DATABASE_NAME}}");
+        $db->exec('PRAGMA foreign_keys = ON;');
+        return $db;
+    }
+
+    public static function ensureDb(): void {
+        $db = self::getConnection();
+        $tables = $db->query("SELECT name FROM sqlite_master WHERE type = 'table'")->fetchArray(SQLITE3_NUM);
+        if (!array_search('frc_user', $tables)) {
+            $query = <<<SQL
+                CREATE TABLE frc_user (
+                    id       INTEGER NOT NULL PRIMARY KEY,
+                    email    TEXT    NOT NULL,
+                    password TEXT    NOT NULL,
+                    salt     TEXT    NOT NULL)
+                SQL;
+            $db->exec($query);
+            $db->exec('CREATE INDEX idx_user_email ON frc_user (email)');
+        }
+        if (!array_search('feed', $tables)) {
+            $query = <<<SQL
+                CREATE TABLE feed (
+                    id         INTEGER NOT NULL PRIMARY KEY,
+                    user_id    INTEGER NOT NULL,
+                    url        TEXT    NOT NULL,
+                    checked_on TEXT,
+                    FOREIGN KEY (user_id) REFERENCES frc_user (id))
+                SQL;
+            $db->exec($query);
+        }
+        if (!array_search('item', $tables)) {
+            $query = <<<SQL
+                CREATE TABLE item (
+                    id            INTEGER NOT NULL PRIMARY KEY,
+                    feed_id       INTEGER NOT NULL,
+                    title         TEXT    NOT NULL,
+                    published_on  TEXT    NOT NULL,
+                    updated_on    TEXT,
+                    content       TEXT    NOT NULL,
+                    is_encoded    INTEGER NOT NULL,
+                    is_read       INTEGER NOT NULL,
+                    is_bookmarked INTEGER NOT NULL,
+                    FOREIGN KEY (feed_id) REFERENCES feed (id))
+                SQL;
+            $db->exec($query);
+        }
+        $db->close();
+    }
+}
+
+Data::ensureDb();