From b43240e5936d327c35229c874abdb5b326ab437d Mon Sep 17 00:00:00 2001
From: Yuchen Pei <id@ypei.org>
Date: Mon, 2 Oct 2023 18:20:09 +1100
Subject: Add path to state, and landing page is for state selection.

---
 bom.el | 78 +++++++++++++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 56 insertions(+), 22 deletions(-)

diff --git a/bom.el b/bom.el
index 1c2b79a..8831ad3 100644
--- a/bom.el
+++ b/bom.el
@@ -41,12 +41,14 @@
     (wa . "IDW14199"))
   "Alist of states and territories and their corresponding filenames on the BOM FTP server, see <http://www.bom.gov.au/catalogue/data-feeds.shtml>.")
 
-(defun bom-api-vic ()
-  "Get Victoria weather from the BOM FTP."
-  (with-current-buffer
-      (find-file-noselect
-       "/ftp:anonymous@ftp.bom.gov.au:/anon/gen/fwo/IDV10753.xml")
-    (libxml-parse-xml-region (point-min) (point-max))))
+(defun bom-api (state)
+  "Get weather forecast data of STATE from the BOM FTP."
+  (if-let ((filename (alist-get (intern (downcase state)) bom-state-files)))
+      (with-current-buffer
+          (find-file-noselect
+           (format "/ftp:anonymous@ftp.bom.gov.au:/anon/gen/fwo/%s.xml" filename))
+        (libxml-parse-xml-region (point-min) (point-max)))
+    (user-error "State %s not found" state)))
 
 (defun bom-get-areas (resp)
   "Given an API response RESP, get all areas."
@@ -105,31 +107,63 @@ Used as parentfn for hierarchy."
   (if (or min-temp max-temp)
       (format "%s - %s"
               (if min-temp (concat min-temp "C") "")
-              (if max-temp (concat max-temp "C") ""))))
+              (if max-temp (concat max-temp "C") ""))
+    ""))
 
 (defun bom-format-areas-org (areas)
-  "Format hierarchy of AREAS with forecasts."
-  (concat "#+title: Victoria weather forecast\n\n"
-          (string-join
-           (hierarchy-map 'bom-format-area bom-area-hierarchy 1)
-           "\n")))
+  "Format hierarchy of AREAS with forecasts.
+
+We use the description of the first root as the state name."
+  (let ((state-name (dom-attr (car (hierarchy-roots areas)) 'description)))
+    (format "#+title: %s weather forecast\n\n%s"
+            state-name
+            (string-join
+             (hierarchy-map 'bom-format-area areas 1)
+             "\n"))))
+
+(defun bom-org-to-html (s)
+  "Export org string S to html and return the html string."
+  (with-temp-buffer
+    (insert s)
+    (org-export-as 'html)))
 
 (defun bom-format-areas-html (areas)
   "Format hierarchy of AREAS with forecasts to html."
-  (with-temp-buffer
-    (insert (bom-format-areas-org areas))
-    (org-export-as 'html)))
+  (bom-org-to-html (bom-format-areas-org areas)))
 
-(defun bom-get-vic-forecasts ()
-  "Call BOM API and return hierarchy of VIC areas with forecasts."
+(defun bom-get-forecasts (state)
+  "Call BOM API and return hierarchy of STATE areas with forecasts."
   (let ((areas (hierarchy-new)))
     (hierarchy-add-trees
-     bom-area-hierarchy
-     (setq bom-areas (bom-get-areas (bom-api-vic)))
+     areas
+     (setq bom-areas (bom-get-areas (bom-api state)))
      'bom-area-parent)
-    (hierarchy-sort bom-area-hierarchy 'bom-area-lessp)
+    (hierarchy-sort areas 'bom-area-lessp)
     areas))
 
+(defun bom-format-state-lists-org ()
+  (format
+   "#+title: Australia weather forecast\n%s"
+   (mapconcat
+    (lambda (pair) (format "[[file:%s][%s]]"
+                           (car pair)
+                           (upcase (format "%s" (car pair)))))
+    bom-state-files
+    " ")))
+
+(defun bom-format-state-lists-html ()
+  (bom-org-to-html (bom-format-state-lists-org)))
+
+(defun bom-format-state-lists-html ())
+
+(defun bom-serve (path)
+  "Serve based on PATH."
+  (setq path (substring path 1))
+  (if (string-empty-p path)
+      (bom-format-state-lists-html)
+    (bom-format-areas-html
+     (bom-get-forecasts path))))
+
 ;;;###autoload
 (defun bom-start ()
   "Start serving weather forecasts."
@@ -141,8 +175,8 @@ Used as parentfn for hierarchy."
              (ws-response-header process 200 '("Content-type" . "text/html"))
              (process-send-string
               process
-              (bom-format-areas-html
-               (bom-get-vic-forecasts)))))
+              (bom-serve (alist-get :GET headers))
+              )))
          9000)))
 
 (defun bom-stop ()
-- 
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