;;; noise-sse-test.el --- Tests for SSE client -*- lexical-binding: t; -*-

;;; Commentary:

;; Tests for noise-sse.el SSE event parsing and connection management.

;;; Code:

(require 'ert)
(require 'noise-sse)

(defvar noise-signal-cli-address)
(defvar noise-account)

(ert-deftest noise-sse--parse-event-basic ()
  "Parse a basic SSE event with data field."
  (let ((event "data: {\"type\":\"message\",\"content\":\"hello\"}\n\n"))
    (let ((result (noise-sse--parse-event event)))
      (should (hash-table-p result))
      (should (equal (gethash "type" result) "message"))
      (should (equal (gethash "content" result) "hello")))))

(ert-deftest noise-sse--parse-event-multiline ()
  "Parse SSE event with multiline data."
  (let ((event "data: {\"type\":\"message\",\ndata: \"content\":\"hello\"}\n\n"))
    (let ((result (noise-sse--parse-event event)))
      (should (hash-table-p result))
      (should (equal (gethash "type" result) "message")))))

(ert-deftest noise-sse--parse-event-empty ()
  "Parse empty SSE event returns nil."
  (let ((event "\n\n"))
    (should (null (noise-sse--parse-event event)))))

(ert-deftest noise-sse--initial-state ()
  "SSE client starts in disconnected state."
  (let ((noise-sse--process nil)
        (noise-sse--reconnect-timer nil)
        (noise-sse--reconnect-delay 1))
    (should (null noise-sse--process))
    (should (null noise-sse--reconnect-timer))
    (should (= 1 noise-sse--reconnect-delay))))

(ert-deftest noise-sse--reconnect-delay-backoff ()
  "Reconnect delay doubles on each attempt."
  (let ((noise-sse--reconnect-delay 1))
    (noise-sse--increase-reconnect-delay)
    (should (= 2 noise-sse--reconnect-delay))
    (noise-sse--increase-reconnect-delay)
    (should (= 4 noise-sse--reconnect-delay))
    (noise-sse--increase-reconnect-delay)
    (should (= 8 noise-sse--reconnect-delay))))

(ert-deftest noise-sse--reconnect-delay-max ()
  "Reconnect delay caps at max value."
  (let ((noise-sse--reconnect-delay 32)
        (noise-sse-max-reconnect-delay 60))
    (noise-sse--increase-reconnect-delay)
    (should (= 60 noise-sse--reconnect-delay))))

(ert-deftest noise-sse--filter-processes-complete-event ()
  "Process filter parses and calls handler for complete events."
  (let ((processed-events '())
        (noise-sse--buffer "")
        (noise-sse--http-buffer "")
        (noise-sse--chunk-buffer "")
        (noise-sse--headers-received t)
        (noise-sse--chunked-response-p nil))
    (let ((noise-sse--event-handler
           (lambda (event) (push event processed-events))))
      (noise-sse--filter nil "data: {\"type\":\"message\"}\n\n")
      (should (= 1 (length processed-events)))
      (should (hash-table-p (car processed-events))))))

(ert-deftest noise-sse--filter-buffers-incomplete-event ()
  "Process filter buffers incomplete events until newline."
  (let ((processed-events '())
        (noise-sse--buffer "")
        (noise-sse--http-buffer "")
        (noise-sse--chunk-buffer "")
        (noise-sse--headers-received t)
        (noise-sse--chunked-response-p nil))
    (let ((noise-sse--event-handler
           (lambda (event) (push event processed-events))))
      (noise-sse--filter nil "data: {\"type\":\"message\"")
      (should (= 0 (length processed-events)))
      (noise-sse--filter nil "}\n\n")
      (should (= 1 (length processed-events))))))

(ert-deftest noise-sse--filter-skips-http-headers ()
  "HTTP response headers should not block the first SSE event."
  (let ((processed-events '())
        (noise-sse--buffer "")
        (noise-sse--http-buffer "")
        (noise-sse--chunk-buffer "")
        (noise-sse--headers-received nil)
        (noise-sse--chunked-response-p nil))
    (let ((noise-sse--event-handler
           (lambda (event) (push event processed-events))))
      (noise-sse--filter nil
                         (concat "HTTP/1.1 200 OK\r\n"
                                 "Content-Type: text/event-stream\r\n\r\n"
                                 "data: {\"type\":\"message\"}\n\n"))
      (should (= 1 (length processed-events)))
      (should (equal "message" (gethash "type" (car processed-events)))))))

(ert-deftest noise-sse--filter-decodes-chunked-http-body ()
  "Chunked HTTP SSE responses should be decoded before parsing events."
  (let ((processed-events '())
        (noise-sse--buffer "")
        (noise-sse--http-buffer "")
        (noise-sse--chunk-buffer "")
        (noise-sse--headers-received nil)
        (noise-sse--chunked-response-p nil))
    (let ((noise-sse--event-handler
           (lambda (event) (push event processed-events))))
      (noise-sse--filter nil
                         (concat "HTTP/1.1 200 OK\r\n"
                                 "Transfer-Encoding: chunked\r\n"
                                 "Content-Type: text/event-stream\r\n\r\n"
                                 "12\r\n"
                                 "data: {\"type\":\"msg"
                                 "\r\n"
                                 "4\r\n"
                                 "\"}\n\n"
                                 "\r\n"
                                 "0\r\n\r\n"))
      (should (= 1 (length processed-events)))
      (should (equal "msg" (gethash "type" (car processed-events)))))))

(ert-deftest noise-sse--build-url ()
  "Build SSE endpoint URL from base address."
  (let ((noise-signal-cli-address "http://localhost:8080")
        (noise-account "+15551234567"))
    (let ((url (noise-sse--build-url)))
      (should (string-match-p "/api/v1/events" url))
      (should (string-match-p "account=%2B15551234567" url)))))

(ert-deftest noise-sse--build-url-no-account ()
  "Build SSE endpoint URL without account parameter."
  (let ((noise-signal-cli-address "http://localhost:8080")
        (noise-account nil))
    (let ((url (noise-sse--build-url)))
      (should (string-match-p "/api/v1/events" url))
      (should-not (string-match-p "account=" url)))))

(ert-deftest noise-sse-connect-is-interactive ()
  "noise-sse-connect is an interactive command."
  (should (commandp 'noise-sse-connect)))

(ert-deftest noise-sse-disconnect-is-interactive ()
  "noise-sse-disconnect is an interactive command."
  (should (commandp 'noise-sse-disconnect)))

(ert-deftest noise-sse-disconnect-cleans-up ()
  "noise-sse-disconnect cleans up process and timer."
  (let ((noise-sse--reconnect-timer (run-with-timer 1000 nil #'ignore)))
    (noise-sse-disconnect)
    (should (null noise-sse--process))
    (should (null noise-sse--reconnect-timer))))

(provide 'noise-sse-test)
;;; noise-sse-test.el ends here