<?php
/*
 * CSE 154 Autumn 18
 * Week 7 Section
 * tas.php web service to demonstrate basic GET parameters with associative arrays.
 *
 * Web service details:
 *   Required GET parameters: 
 *   - One of:
 *     - section
 *     - name
 *   Output Format:
 *   - txt 
 *   Output Details:
 *   - If section parameter is passed, outputs full name of TA who teaches that section.
 *     - Outputs error message if no section with given section code was found.
 *   - Else if name parameter is passed, outputs section code for TA who has the first name.
 *     - Outputs error message is no TA has the passed first name. 
 *   - Else outputs error message. 
 */
header("Content-type: text/plain");
$tas = array("AA" => "Connie Wang", "AB" => "Jack Venberg",
             "AC" => "William Kim", "AD" => "Kelley Chen",
             "AE" => "Sweekruthi Raghunathan", "AF" => "Jeffrey Worley",
             "AI" => "Sven Hansen", "AJ" => "Anupam Gupta",
             "AK" => "Conner Ardman", "AL" => "Andrew Wolfram");

# Part 1: Finish this web service to take a GET parameter called 'section'
# and print out the TA name for that section.
if (isset($_GET["section"])) {
  $section = strtoupper($_GET["section"]);
  if ($tas[$section]) {
    echo $tas[$section];
  } else {
    echo "Passed section code not found.";
  }
} else if (isset($_GET["name"])) {
  # Part 2: Finish this web service to take a GET parameter called 'name'
  # and print out the section for the TA with the value passed as their first name.
  $name = $_GET["name"];
  foreach ($tas as $key => $value) {
    # explode is a function which "explodes" a string based on a delimiter, returning an array of the pieces
    $firstname = explode(" ", $value)[0]; 
    if (strtolower($name) === strtolower($firstname)) {
      echo "$key\n"; # we found a TA with the first name! Print their section code.
    }
  }
} else {
  echo "Missing one of required 'section' or 'name' GET parameters.";
}
?>