<?
require_once "json_store.php";
require_once "json_collection.php";
require_once "searching.php";

$query = trim(isset($_GET["q"]) ? $_GET["q"] : "");
$store   = new Json_Store("engines.json");
$engines = new Json_Collection($store, "engines", "keyword");

do {
    // ----------- JSON requests ----------------------
    // These kill the script
    switch (isset($_GET["a"]) ? $_GET["a"] : "") {
        case "save": 
            $engine = json_body();
            $engine["keyword"] = strtolower($engine["keyword"]);
            $engines->save($engine);
            // NOTE: Fallthrough!

        case "engines":
            json_response($engines->allSorted());
            break;
    }

    // ----------- Check for query ----------------------
    if ($query) {
        $words   = parse_query($query);
        $keyword = $words[0];
        unset($words[0]);

        // Look for requested engine
        $engine  = $engines->find(strtolower($keyword), 'keyword');
        if (!$engine) {
            $error = "Unknown engine: $keyword";
            break;
        }

        // Check positional arguments from engine against provided query
        $positionals = get_positionals($engine["url"]);
        if (count($words) < count($positionals)) {
            $error = sprintf("%s requires at least %d positional arguments (%s)", $engine["name"], count($positionals), $engine["remarks"]);
            break;
        }

        // If everything checks out, construct URL and redirect
        $url = url_replace($engine["url"], $words, $positionals);
  
        header("Location: $url");
        die;
    }

} while(0);

include_once "page-template.php";