1 files changed, 80 insertions, 0 deletions
diff --git a/src/Schema.php b/src/Schema.php
new file mode 100644
index 0000000..bbb47de
--- /dev/null
+++ b/src/Schema.php
@@ -0,0 +1,80 @@
+<?php
+
+namespace Micropoly;
+
+use SQLite3;
+
+class Schema
+{
+    private SQLite3 $db;
+
+    /**
+     * @param SQLite3 $db
+     */
+    public function __construct(SQLite3 $db) { $this->db = $db; }
+
+    private function getSchemaVersion(): int
+    {
+        $n = $this->db->querySingle("SELECT name FROM sqlite_master WHERE type = 'table' AND name = 'schema_meta'");
+        if ($n !== "schema_meta")
+            return 0;
+
+        return (int)$this->db->querySingle("SELECT value FROM schema_meta WHERE key = 'version'");
+    }
+
+    private function setSchemaVersion(int $v): void
+    {
+        (new DbQuery("REPLACE INTO schema_meta (key, value) VALUES ('version', :v)"))
+            ->bind(":v", $v)
+            ->exec($this->db);
+    }
+
+    public function migrate()
+    {
+        $version = $this->getSchemaVersion();
+
+        switch ($version) {
+            case 0:
+                $this->v1();
+                $this->setSchemaVersion(1);
+        }
+    }
+
+    private function v1()
+    {
+        $this->db->exec("
+            CREATE TABLE schema_meta (
+                key VARCHAR(100) NOT NULL PRIMARY KEY,
+                value
+            ) WITHOUT ROWID
+        ");
+        $this->db->exec("
+            CREATE VIRTUAL TABLE note_contents USING fts4 (content TEXT)
+        ");
+        $this->db->exec("
+            CREATE TABLE notes (
+                id VARCHAR(23) NOT NULL PRIMARY KEY,
+                content_row INT NOT NULL,
+                created_at BIGINT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+                changed_at BIGINT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+                trash INT NOT NULL DEFAULT 0
+            ) WITHOUT ROWID
+        ");
+        $this->db->exec("
+            CREATE TABLE tags (
+                note_id VARCHAR(23) NOT NULL REFERENCES notes (id) ON UPDATE CASCADE ON DELETE CASCADE,
+                tag TEXT NOT NULL,
+                PRIMARY KEY (note_id, tag)
+            ) WITHOUT ROWID
+        ");
+        $this->db->exec("CREATE INDEX tag ON tags (tag)");
+        $this->db->exec("
+            CREATE VIEW tagcloud AS
+                SELECT
+                    tag,
+                    COUNT(*) AS num
+                FROM tags
+                GROUP BY tag
+        ");
+    }
+}