From 92638157275bf51dc0076454cfb901f5bbe4f127 Mon Sep 17 00:00:00 2001
From: Roberto Alsina <roberto.alsina@gmail.com>
Date: Sun, 4 Jun 2023 18:17:22 -0300
Subject: [PATCH] * Misma funcion query que la otra funcion * Mejor soporte de
 nombres que no estan en la base de datos

---
 c-historico/handler.cr | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)

diff --git a/c-historico/handler.cr b/c-historico/handler.cr
index 2815c8c..59feba1 100644
--- a/c-historico/handler.cr
+++ b/c-historico/handler.cr
@@ -6,7 +6,7 @@ require "json"
 require "uuid"
 
 class Handler
-  def format_buffer(buffer, canvas_name, title)
+  def format_buffer(buffer, canvas_name, title = "")
     # Process the gnuplot output so it works in the page
     #
     # buffer is the Ishi output
@@ -37,6 +37,11 @@ class Handler
   end
 
   def query(sql)
+    # Runs a SQL query against the Rqlite database.
+    #
+    # Returns an array of values (which need to be casted)
+    # Or nil if there are no results
+
     params = URI::Params.encode({"q": sql})
     response = HTTP::Client.get URI.new(
       "http",
@@ -48,12 +53,10 @@ class Handler
     # This API only has a values key when there are actual results
     results = JSON.parse(response.body)["results"][0].as_h
     if results.has_key?("values")
-      return results["values"].as_a.map { |r|
-        [r[0].as_i, r[1].as_i]
-      }
+      return results["values"].as_a
     end
-    # Return a dummy result
-    [[1922, 0]]
+    # No result, return nil
+    nil
   end
 
   nombres = [] of String
@@ -93,15 +96,22 @@ class Handler
         sql = "SELECT anio, contador FROM nombres WHERE nombre = '#{nombre}' ORDER BY anio"
         x = Array(Int32).new
         y = Array(Int32).new
-        query(sql).map { |r|
-          x << r[0]
-          y << r[1]
-        }
+        results = query(sql)
+        if results.nil?  # No results, all 0s
+          x = (1922..2015).to_a
+          y = x.map {|_| 0}
+        else  # We got results
+          displayed = true
+          results.map { |r|
+            x << r[0].as_i
+            y << r[1].as_i
+          }
+        end
         plot(x, y, title: nombre.titleize, style: :lines, linewidth: 3)
       }
     end
 
-    {
+    return {
       body:        format_buffer(buffer, "historico"),
       status_code: 200,
       headers:     HTTP::Headers{"Content-Type" => "text/html"},