#lang racket/base

(require racket/date racket/match racket/string
         net/url-string)

(provide get-date parse-url get-user-agent-header)

(define (get-date)
  (parameterize ([date-display-format 'rfc2822])
    ;; aaaaaaaaaaaaaaaaaaaaa
    (regexp-replace
      #px"[^ ]+$"
      (date->string (seconds->date (* 0.001 (current-inexact-milliseconds)) #f) #t)
      "GMT")))

(define (parse-url fetch-url)
  (printf "fetching page: ~a\n" fetch-url)
  (define parsed-url (if (string? fetch-url) (string->url fetch-url) fetch-url))
  (match parsed-url
    [(url scheme user host port path-absolute? path query fragment)
     (define ssl? (string=? (string-downcase scheme) "https"))
     (values parsed-url ssl? host
             (or port (if ssl? 443 80))
             (format "/~a" (string-join (map path/param-path path) "/")))]))

(define (get-user-agent-header)
  (format "User-Agent: Racket/~a (net/http-client) static-generator/0.1 trans/rights" (version)))