<?php

namespace php;

use Monolog\Logger;
use SQLite3;


/**
 * Manages interaction with the database in the context of trackings.
 */
class TrackingManager
{
    /**
     * @var Logger The logger to use for logging.
     */
    private Logger $logger;
    /**
     * @var string The filename of the database to interact with.
     */
    private string $db_filename;


    /**
     * Constructs a new tracking manager.
     *
     * @param Logger $logger the logger to use for logging
     * @param string $db_filename the filename of the database to interact with
     */
    public function __construct(Logger $logger, string $db_filename)
    {
        $this->logger = $logger;
        $this->db_filename = $db_filename;
    }


    /**
     * Populates the database with the necessary structures for users.
     *
     * @return void
     */
    public function install(): void
    {
        $db = new SQLite3($this->db_filename, SQLITE3_OPEN_READWRITE);
        $db->exec("CREATE TABLE trackings(user_uuid text not null, person_name text not null, is_deceased int not null default 0, PRIMARY KEY (user_uuid, person_name));");
        $db->close();
    }

    /**
     * Adds a tracking to the database.
     *
     * @param string $user_uuid the user to whom the tracking belongs
     * @param string $person_name the name of the person to track
     * @return Response a response with no message, and a status indicating whether the insertion succeeded
     */
    public function add_tracking(string $user_uuid, string $person_name): Response
    {
        $db = new SQLite3($this->db_filename, SQLITE3_OPEN_READWRITE);
        $stmt = $db->prepare("INSERT INTO trackings (user_uuid, person_name) VALUES (:user_uuid, :person_name);");
        $stmt->bindValue(":user_uuid", $user_uuid);
        $stmt->bindValue(":person_name", $person_name);
        $inserted = $stmt->execute() !== false;
        $db->close();

        return new Response(null, $inserted);
    }

    /**
     * Removes a tracking from the database.
     *
     * @param string $user_uuid the user to whom the tracking belongs
     * @param string $person_name the name of the tracked person to remove
     * @return Response a response with no message, and a status indicating whether the removal succeeded
     */
    public function remove_tracking(string $user_uuid, string $person_name): Response
    {
        $db = new SQLite3($this->db_filename, SQLITE3_OPEN_READWRITE);
        $stmt = $db->prepare("DELETE FROM trackings WHERE user_uuid=:user_uuid AND person_name=:person_name;");
        $stmt->bindValue(":user_uuid", $user_uuid);
        $stmt->bindValue(":person_name", $person_name);
        $inserted = $stmt->execute() !== false;
        $db->close();

        return new Response(null, $inserted);
    }

    /**
     * Lists all trackings of the indicated user.
     *
     * @param string $user_uuid the user to return the trackings of
     * @return Response a response with all trackings of the indicated user
     */
    public function list_trackings(string $user_uuid): Response
    {
        $db = new SQLite3($this->db_filename, SQLITE3_OPEN_READONLY);
        $stmt = $db->prepare("SELECT * FROM trackings WHERE user_uuid=:user_uuid;");
        $stmt->bindValue(":user_uuid", $user_uuid);
        $results = $stmt->execute();

        $trackings = [];
        while ($row = $results->fetchArray(SQLITE3_ASSOC))
            $trackings[] = $row;

        $db->close();
        return new Response($trackings, true);
    }
}