From bfda4e40cce3aa986e4fe8d3881a689cd6ef411f Mon Sep 17 00:00:00 2001
From: Lars-Dominik Braun <PromyLOPh@gmail.com>
Date: Tue, 12 Aug 2008 22:36:48 +0200
Subject: Initial "narrative" implementation

"Why did you play this song?"
---
 libpiano/src/main.c  | 31 +++++++++++++++++++++++++++++++
 libpiano/src/piano.h |  2 ++
 libpiano/src/xml.c   | 17 +++++++++++++++++
 libpiano/src/xml.h   |  1 +
 src/main.c           | 16 +++++++++++++++-
 src/pianobar.1       |  4 ++++
 6 files changed, 70 insertions(+), 1 deletion(-)

diff --git a/libpiano/src/main.c b/libpiano/src/main.c
index 7887132..2b51303 100644
--- a/libpiano/src/main.c
+++ b/libpiano/src/main.c
@@ -779,6 +779,37 @@ PianoReturn_t PianoTransformShared (PianoHandle_t *ph,
 	return ret;
 }
 
+PianoReturn_t PianoExplain (const PianoHandle_t *ph, const PianoSong_t *song,
+		char **retExplain) {
+	char xmlSendBuf[PIANO_SEND_BUFFER_SIZE], url[PIANO_URL_BUFFER_SIZE];
+	char *requestStr, *retStr;
+	PianoReturn_t ret;
+
+	snprintf (xmlSendBuf, sizeof (xmlSendBuf), "<?xml version=\"1.0\"?>"
+			"<methodCall><methodName>playlist.narrative</methodName>"
+			"<params><param><value><int>%li</int></value></param>"
+			"<param><value><string>%s</string></value></param>"
+			"<param><value><string>%s</string></value></param>"
+			"<param><value><string>%s</string></value></param>"
+			"</params></methodCall>", time (NULL), ph->user.authToken,
+			song->stationId, song->musicId);
+	requestStr = PianoEncryptString (xmlSendBuf);
+	
+	snprintf (url, sizeof (url), PIANO_RPC_URL "rid=%s&lid=%s&"
+			"method=method=narrative&arg1=%s&arg2=%s", ph->routeId,
+			ph->user.listenerId, song->stationId, song->musicId);
+	
+	if ((ret = PianoHttpPost (ph->curlHandle, url, requestStr, &retStr)) ==
+			PIANO_RET_OK) {
+		ret = PianoXmlParseNarrative (retStr, retExplain);
+		PianoFree (retStr, 0);
+	}
+
+	PianoFree (requestStr, 0);
+
+	return ret;
+}
+
 /*	convert return value to human-readable string
  *	@param enum
  *	@return error string
diff --git a/libpiano/src/piano.h b/libpiano/src/piano.h
index 3a7c740..b0e741e 100644
--- a/libpiano/src/piano.h
+++ b/libpiano/src/piano.h
@@ -186,6 +186,8 @@ PianoStation_t *PianoFindStationById (PianoStation_t *stations,
 PianoReturn_t PianoGetGenreStations (PianoHandle_t *ph);
 PianoReturn_t PianoTransformShared (PianoHandle_t *ph,
 		PianoStation_t *station);
+PianoReturn_t PianoExplain (const PianoHandle_t *ph, const PianoSong_t *song,
+		char **retExplain);
 const char *PianoErrorToStr (PianoReturn_t ret);
 
 #endif /* _PIANO_H */
diff --git a/libpiano/src/xml.c b/libpiano/src/xml.c
index c0d388f..6d4dad8 100644
--- a/libpiano/src/xml.c
+++ b/libpiano/src/xml.c
@@ -744,3 +744,20 @@ PianoReturn_t PianoXmlParseTranformStation (const char *searchXml) {
 
 	return PIANO_RET_OK;
 }
+
+PianoReturn_t PianoXmlParseNarrative (const char *xml, char **retNarrative) {
+	xmlNode *docRoot;
+	xmlDocPtr doc;
+	PianoReturn_t ret;
+
+	if ((ret = PianoXmlInitDoc (xml, &doc, &docRoot)) != PIANO_RET_OK) {
+		return ret;
+	}
+
+	xmlNode *val = docRoot->children->children->children->children;
+	*retNarrative = strdup ((char *) val->content);
+
+	xmlFreeDoc (doc);
+
+	return ret;
+}
diff --git a/libpiano/src/xml.h b/libpiano/src/xml.h
index 5ee7e7c..2d44ab3 100644
--- a/libpiano/src/xml.h
+++ b/libpiano/src/xml.h
@@ -38,6 +38,7 @@ PianoReturn_t PianoXmlParseAddSeed (PianoHandle_t *ph, const char *xml,
 PianoReturn_t PianoXmlParseGenreExplorer (PianoHandle_t *ph,
 		const char *xmlContent);
 PianoReturn_t PianoXmlParseTranformStation (const char *searchXml);
+PianoReturn_t PianoXmlParseNarrative (const char *xml, char **retNarrative);
 
 char *PianoXmlEncodeString (const char *s);
 
diff --git a/src/main.c b/src/main.c
index 67e9319..a2a169d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -511,7 +511,7 @@ int main (int argc, char **argv) {
 		/* in the meantime: wait for user actions */
 		struct pollfd polls = {fileno (stdin), POLLIN, POLLIN};
 		char buf, yesnoBuf;
-		char *lineBuf, *musicId;
+		char *lineBuf, *musicId, *explanation;
 		PianoStation_t *moveStation;
 
 		if (poll (&polls, 1, 1000) > 0) {
@@ -522,6 +522,7 @@ int main (int argc, char **argv) {
 							"b\tban current song\n"
 							"c\tcreate new station\n"
 							"d\tdelete current station\n"
+							"e\texplain why this song is played\n"
 							"g\tadd genre station\n"
 							"l\tlove current song\n"
 							"n\tnext song\n"
@@ -597,6 +598,19 @@ int main (int argc, char **argv) {
 					}
 					break;
 
+				case 'e':
+					if (curSong == NULL) {
+						BarUiMsg ("No song playing.\n");
+						break;
+					}
+					BarUiMsg ("Receiving explanation... ");
+					if (BarUiPrintPianoStatus (PianoExplain (&ph, curSong,
+							&explanation)) == PIANO_RET_OK) {
+						printf ("%s\n", explanation);
+						free (explanation);
+					}
+					break;
+
 				case 'g':
 					/* use genre station */
 					BarStationFromGenre (&ph);
diff --git a/src/pianobar.1 b/src/pianobar.1
index 5cf9983..bd0db3c 100644
--- a/src/pianobar.1
+++ b/src/pianobar.1
@@ -34,6 +34,10 @@ artist of your choice.
 .B d
 Delete current station.
 
+.TP
+.B e
+Explain why this song is played.
+
 .TP
 .B g
 Add genre station provided by pandora.
-- 
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