import "sqlite" for Database
import "io" for File

foreign class Host {
  foreign static signalDone()
}

var mainFiber = Fiber.new {
  var db = Database.new()
  var dbPath = "test.db"
  var isDone = false

  if (File.exists(dbPath)) File.delete(dbPath)
  System.print("--- Starting SQLite CRUD Example ---")

  db.open(dbPath) { |err|
    if (err) {
      System.print("Error opening database: %(err)")
      isDone = true
      return
    }
    System.print("Database opened successfully at '%(dbPath)'.")

    var createSql = "CREATE TABLE users (id INTEGER PRIMARY KEY, name TEXT, email TEXT);"
    db.exec(createSql) { |err|
      if (err) {
        System.print("Error creating table: %(err)")
        isDone = true
        return
      }
      System.print("Table 'users' created.")

      // Insert and read 1000 times
      var insertCount = 0
      var doInsertAndRead
      doInsertAndRead = Fn.new {
        if (insertCount >= 100000) {
          // Finished, close db
          db.close() { |err|
            if (err) {
              System.print("Error closing database: %(err)")
            } else {
              System.print("\nDatabase closed successfully.")
            }
            System.print("\n--- SQLite CRUD Example Finished ---")
            isDone = true
          }
          return
        }
        var name = "User_%(insertCount)"
        var email = "user%(insertCount)@example.com"
        var insertSql = "INSERT INTO users (name, email) VALUES ('%(name)', '%(email)');"
        db.exec(insertSql) { |err|
          if (err) {
            System.print("Error inserting user %(name): %(err)")
            isDone = true
            return
          }
          db.query("SELECT * FROM users WHERE name = '%(name)';") { |err, rows|
            if (err) {
              System.print("Error querying user %(name): %(err)")
              isDone = true
              return
            }
            for (row in rows) {
              System.print("Inserted and read: ID: %(row["id"]), Name: %(row["name"]), Email: %(row["email"])")
            }
            insertCount = insertCount + 1
            doInsertAndRead.call()
          }
        }
      }
      doInsertAndRead.call()
    }
  }

  while (!isDone) Fiber.yield()
  Host.signalDone()
}