From c4ab196719e99e6ab9e323175124cf1d9aafa36e Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Fri, 9 Aug 2019 22:00:08 +0200
Subject: Next video in list to play should be next in playlist (if available)

---
 src/plugins/Youtube.cpp | 79 +++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 74 insertions(+), 5 deletions(-)

(limited to 'src/plugins/Youtube.cpp')

diff --git a/src/plugins/Youtube.cpp b/src/plugins/Youtube.cpp
index 56e8574..0f0ca05 100644
--- a/src/plugins/Youtube.cpp
+++ b/src/plugins/Youtube.cpp
@@ -127,11 +127,44 @@ namespace QuickMedia {
         return result == 0 ? SuggestionResult::OK : SuggestionResult::ERR;
     }
 
+    static std::string get_playlist_id_from_url(const std::string &url) {
+        std::string playlist_id = url;
+        size_t list_index = playlist_id.find("&list=");
+        if(list_index == std::string::npos)
+            return playlist_id;
+        return playlist_id.substr(list_index);
+    }
+
+    static std::string remove_index_from_playlist_url(const std::string &url) {
+        std::string result = url;
+        size_t index = result.rfind("&index=");
+        if(index == std::string::npos)
+            return result;
+        return result.substr(0, index);
+    }
+
+    // TODO: Make this faster by using string search instead of parsing html.
+    // TODO: If the result is a play
     BodyItems Youtube::get_related_media(const std::string &url) {
         BodyItems result_items;
+        struct ItemData {
+            BodyItems &result_items;
+            size_t index = 0;
+        };
+        ItemData item_data { result_items, 0 };
+
+        std::string modified_url = remove_index_from_playlist_url(url);
+        std::string playlist_id = get_playlist_id_from_url(modified_url);
+        if(playlist_id == last_related_media_playlist_id) {
+            result_items.reserve(last_playlist_data.size());
+            for(auto &data : last_playlist_data) {
+                result_items.push_back(std::make_unique<BodyItem>(*data));
+            }
+            return result_items;
+        }
 
         std::string website_data;
-        if(download_to_string(url, website_data) != DownloadResult::OK)
+        if(download_to_string(modified_url, website_data) != DownloadResult::OK)
             return result_items;
 
         QuickMediaHtmlSearch html_search;
@@ -139,19 +172,55 @@ namespace QuickMedia {
         if(result != 0)
             goto cleanup;
 
+        if(!playlist_id.empty()) {
+            result = quickmedia_html_find_nodes_xpath(&html_search, "//a",
+                [](QuickMediaHtmlNode *node, void *userdata) {
+                    auto *item_data = (ItemData*)userdata;
+                    const char *node_class = quickmedia_html_node_get_attribute_value(node, "class");
+                    const char *href = quickmedia_html_node_get_attribute_value(node, "href");
+                    if(node_class && href && contains(node_class, "playlist-video")) {
+                        auto item = std::make_unique<BodyItem>("");
+                        item->url = std::string("https://www.youtube.com") + remove_index_from_playlist_url(href);
+                        item_data->result_items.push_back(std::move(item));
+                    }
+                }, &item_data);
+
+            result = quickmedia_html_find_nodes_xpath(&html_search, "//li",
+                [](QuickMediaHtmlNode *node, void *userdata) {
+                    auto *item_data = (ItemData*)userdata;
+                    if(item_data->index >= item_data->result_items.size())
+                        return;
+
+                    // TODO: Also add title for related media. This data is in @data-title
+                    const char *data_thumbnail_url = quickmedia_html_node_get_attribute_value(node, "data-thumbnail-url");
+                    if(data_thumbnail_url && contains(data_thumbnail_url, "ytimg.com")) {
+                        item_data->result_items[item_data->index]->thumbnail_url = data_thumbnail_url;
+                        ++item_data->index;
+                    }
+                }, &item_data);
+        }
+
+        // We want non-playlist videos every when there is a playlist, since we want to play non-playlist videos after
+        // playing all playlist videos
         result = quickmedia_html_find_nodes_xpath(&html_search, "//ul[class=\"video-list\"]//div[class=\"content-wrapper\"]/a",
             [](QuickMediaHtmlNode *node, void *userdata) {
-                auto *result_items = (BodyItems*)userdata;
+                auto *item_data = (ItemData*)userdata;
                 const char *href = quickmedia_html_node_get_attribute_value(node, "href");
-                // TODO: Also add title for related media
+                // TODO: Also add title for related media and thumbnail
                 if(href && begins_with(href, "/watch?v=")) {
                     auto item = std::make_unique<BodyItem>("");
                     item->url = std::string("https://www.youtube.com") + href;
-                    result_items->push_back(std::move(item));
+                    item_data->result_items.push_back(std::move(item));
                 }
-            }, &result_items);
+            }, &item_data);
 
         cleanup:
+        last_playlist_data.clear();
+        last_playlist_data.reserve(result_items.size());
+        for(auto &data : result_items) {
+            last_playlist_data.push_back(std::make_unique<BodyItem>(*data));
+        }
+        last_related_media_playlist_id = playlist_id;
         quickmedia_html_search_deinit(&html_search);
         return result_items;
     }
-- 
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