init spotify

Change-Id: I6796976649ee59f4e647148e77d76effa7315f73

1 files changed, 65 insertions, 0 deletions

diff --git a/src/db.cpp b/src/db.cpp
index cea15c0..73a7f02 100644
--- a/src/db.cpp
+++ b/src/db.cpp
@@ -81,3 +81,68 @@ namespace db {
     }
 
 }
+
+#include <142bot/date.h>
+
+#include <142bot/iso_week.h>
+#include <iomanip>
+#include <sstream>
+#include <stdexcept>    // std::invalid_argument
+
+namespace asdf
+{
+    timestamp from_iso8601_str( const std::string& s )
+    {
+        timestamp ts;
+        if( !from_iso8601_str( s, ts ) )
+            throw std::invalid_argument{
+                "failed to parse "
+                + s
+                + " as an ISO 8601 timestamp"
+            };
+        return ts;
+    }
+    
+    bool from_iso8601_str( const std::string& s, timestamp& ts )
+    {
+        std::istringstream stream{ s };
+        stream >> date::parse( "%F %T%z", ts );
+        return !stream.fail();
+    }
+    
+    std::string to_iso8601_str( const timestamp& ts )
+    {
+        return date::format( "%F %T%z", ts );
+    }
+    
+    std::string to_http_ts_str( const timestamp& ts )
+    {
+        std::stringstream weekday_abbreviation;
+        weekday_abbreviation << static_cast< iso_week::year_weeknum_weekday >(
+            std::chrono::time_point_cast< date::days >( ts )
+        ).weekday();
+        
+        return (
+            weekday_abbreviation.str()
+            // timestamps serialize to UTC/GMT by default
+            + date::format(
+                " %d-%m-%Y %H:%M:%S GMT",
+                std::chrono::time_point_cast< std::chrono::seconds >( ts )
+            )
+        );
+    }
+    
+    timestamp from_unix_time( unsigned int unix_time )
+    {
+        return timestamp{ std::chrono::duration_cast<
+            std::chrono::microseconds
+        >( std::chrono::seconds{ unix_time } ) };
+    }
+    
+    unsigned int to_unix_time( const timestamp& ts )
+    {
+        return std::chrono::duration_cast<
+            std::chrono::seconds
+        >( ts.time_since_epoch() ).count();
+    }
+}
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