From 7197da21f6bcc1aaa5d1905228e0e2ec1caf3fa8 Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Mon, 17 Jul 2023 16:54:35 +1000
Subject: Basic playlists for upcoming

Beware under-testing and bugs. Just getting something barebones in so
that I can do rN+1 bringup
---
 src/audio/track_queue.cpp | 168 +++++++++++++++++++++++++++++++---------------
 1 file changed, 113 insertions(+), 55 deletions(-)

(limited to 'src/audio/track_queue.cpp')

diff --git a/src/audio/track_queue.cpp b/src/audio/track_queue.cpp
index 1c233f8f..0709056f 100644
--- a/src/audio/track_queue.cpp
+++ b/src/audio/track_queue.cpp
@@ -8,10 +8,12 @@
 
 #include <algorithm>
 #include <mutex>
+#include <variant>
 
 #include "audio_events.hpp"
 #include "audio_fsm.hpp"
 #include "event_queue.hpp"
+#include "source.hpp"
 #include "track.hpp"
 #include "ui_fsm.hpp"
 
@@ -21,107 +23,163 @@ TrackQueue::TrackQueue() {}
 
 auto TrackQueue::GetCurrent() const -> std::optional<database::TrackId> {
   const std::lock_guard<std::mutex> lock(mutex_);
-  return current_;
+  if (enqueued_.empty()) {
+    return {};
+  }
+  auto item = enqueued_.front();
+  if (std::holds_alternative<database::TrackId>(item)) {
+    return std::get<database::TrackId>(item);
+  }
+  if (std::holds_alternative<std::shared_ptr<playlist::ISource>>(item)) {
+    return std::get<std::shared_ptr<playlist::ISource>>(item)->Current();
+  }
+  if (std::holds_alternative<std::shared_ptr<playlist::IResetableSource>>(
+          item)) {
+    return std::get<std::shared_ptr<playlist::IResetableSource>>(item)
+        ->Current();
+  }
+  return {};
 }
 
 auto TrackQueue::GetUpcoming(std::size_t limit) const
     -> std::vector<database::TrackId> {
   const std::lock_guard<std::mutex> lock(mutex_);
   std::vector<database::TrackId> ret;
-  limit = std::min(limit, upcoming_.size());
-  std::for_each_n(upcoming_.begin(), limit,
-                  [&](const auto i) { ret.push_back(i); });
+
+  auto it = enqueued_.begin();
+  if (it == enqueued_.end()) {
+    return ret;
+  }
+
+  // Don't include the current track. This is only relevant to raw track ids,
+  // since sources include multiple tracks.
+  if (std::holds_alternative<database::TrackId>(*it)) {
+    it++;
+  }
+
+  while (limit > 0 && it != enqueued_.end()) {
+    auto item = *it;
+    if (std::holds_alternative<database::TrackId>(item)) {
+      ret.push_back(std::get<database::TrackId>(item));
+      limit--;
+    } else if (std::holds_alternative<std::shared_ptr<playlist::ISource>>(
+                   item)) {
+      limit -=
+          std::get<std::shared_ptr<playlist::ISource>>(item)->Peek(limit, &ret);
+    } else if (std::holds_alternative<
+                   std::shared_ptr<playlist::IResetableSource>>(item)) {
+      limit -=
+          std::get<std::shared_ptr<playlist::IResetableSource>>(item)->Peek(
+              limit, &ret);
+    }
+    it++;
+  }
+
   return ret;
 }
 
 auto TrackQueue::AddNext(database::TrackId t) -> void {
   const std::lock_guard<std::mutex> lock(mutex_);
-  if (!current_) {
-    current_ = t;
-  } else {
-    upcoming_.push_front(t);
-  }
+  enqueued_.push_front(t);
+  events::Dispatch<QueueUpdate, AudioState, ui::UiState>({});
+}
 
+auto TrackQueue::AddNext(std::shared_ptr<playlist::ISource> src) -> void {
+  const std::lock_guard<std::mutex> lock(mutex_);
+  enqueued_.push_front(src);
   events::Dispatch<QueueUpdate, AudioState, ui::UiState>({});
 }
 
-auto TrackQueue::AddNext(const std::vector<database::TrackId>& t) -> void {
+auto TrackQueue::IncludeNext(std::shared_ptr<playlist::IResetableSource> src)
+    -> void {
   const std::lock_guard<std::mutex> lock(mutex_);
-  std::for_each(t.rbegin(), t.rend(),
-                [&](const auto i) { upcoming_.push_front(i); });
-  if (!current_) {
-    current_ = upcoming_.front();
-    upcoming_.pop_front();
-  }
+  enqueued_.push_front(src);
   events::Dispatch<QueueUpdate, AudioState, ui::UiState>({});
 }
 
 auto TrackQueue::AddLast(database::TrackId t) -> void {
   const std::lock_guard<std::mutex> lock(mutex_);
-  if (!current_) {
-    current_ = t;
-  } else {
-    upcoming_.push_back(t);
-  }
+  enqueued_.push_back(t);
+  events::Dispatch<QueueUpdate, AudioState, ui::UiState>({});
+}
 
+auto TrackQueue::AddLast(std::shared_ptr<playlist::ISource> src) -> void {
+  const std::lock_guard<std::mutex> lock(mutex_);
+  enqueued_.push_back(src);
   events::Dispatch<QueueUpdate, AudioState, ui::UiState>({});
 }
 
-auto TrackQueue::AddLast(const std::vector<database::TrackId>& t) -> void {
+auto TrackQueue::IncludeLast(std::shared_ptr<playlist::IResetableSource> src)
+    -> void {
   const std::lock_guard<std::mutex> lock(mutex_);
-  std::for_each(t.begin(), t.end(),
-                [&](const auto i) { upcoming_.push_back(i); });
-  if (!current_) {
-    current_ = upcoming_.front();
-    upcoming_.pop_front();
-  }
+  enqueued_.push_back(src);
   events::Dispatch<QueueUpdate, AudioState, ui::UiState>({});
 }
 
 auto TrackQueue::Next() -> void {
   const std::lock_guard<std::mutex> lock(mutex_);
-  if (current_) {
-    played_.push_front(*current_);
+  if (enqueued_.empty()) {
+    return;
+  }
+
+  auto item = enqueued_.front();
+  if (std::holds_alternative<database::TrackId>(item)) {
+    played_.push_front(std::get<database::TrackId>(item));
+    enqueued_.pop_front();
+  }
+  if (std::holds_alternative<std::shared_ptr<playlist::ISource>>(item)) {
+    auto src = std::get<std::shared_ptr<playlist::ISource>>(item);
+    played_.push_front(*src->Current());
+    if (!src->Advance()) {
+      enqueued_.pop_front();
+    }
   }
-  if (!upcoming_.empty()) {
-    current_ = upcoming_.front();
-    upcoming_.pop_front();
-  } else {
-    current_.reset();
+  if (std::holds_alternative<std::shared_ptr<playlist::IResetableSource>>(
+          item)) {
+    auto src = std::get<std::shared_ptr<playlist::IResetableSource>>(item);
+    if (!src->Advance()) {
+      played_.push_back(src);
+      enqueued_.pop_front();
+    }
   }
+
   events::Dispatch<QueueUpdate, AudioState, ui::UiState>({});
 }
 
 auto TrackQueue::Previous() -> void {
   const std::lock_guard<std::mutex> lock(mutex_);
-  if (current_) {
-    upcoming_.push_front(*current_);
+  if (!enqueued_.empty() &&
+      std::holds_alternative<std::shared_ptr<playlist::IResetableSource>>(
+          enqueued_.front())) {
+    auto src = std::get<std::shared_ptr<playlist::IResetableSource>>(
+        enqueued_.front());
+    if (src->Previous()) {
+      events::Dispatch<QueueUpdate, AudioState, ui::UiState>({});
+      return;
+    }
+  }
+
+  if (played_.empty()) {
+    return;
   }
-  if (!played_.empty()) {
-    current_ = played_.front();
-    played_.pop_front();
-  } else {
-    current_.reset();
+
+  auto item = played_.front();
+  if (std::holds_alternative<database::TrackId>(item)) {
+    enqueued_.push_front(std::get<database::TrackId>(item));
+  } else if (std::holds_alternative<
+                 std::shared_ptr<playlist::IResetableSource>>(item)) {
+    enqueued_.push_front(
+        std::get<std::shared_ptr<playlist::IResetableSource>>(item));
   }
+  played_.pop_front();
+
   events::Dispatch<QueueUpdate, AudioState, ui::UiState>({});
 }
 
 auto TrackQueue::Clear() -> void {
   const std::lock_guard<std::mutex> lock(mutex_);
   played_.clear();
-  upcoming_.clear();
-  current_.reset();
-  events::Dispatch<QueueUpdate, AudioState, ui::UiState>({});
-}
-
-auto TrackQueue::RemoveUpcoming(database::TrackId t) -> void {
-  const std::lock_guard<std::mutex> lock(mutex_);
-  for (auto it = upcoming_.begin(); it != upcoming_.end(); it++) {
-    if (*it == t) {
-      upcoming_.erase(it);
-      return;
-    }
-  }
+  enqueued_.clear();
   events::Dispatch<QueueUpdate, AudioState, ui::UiState>({});
 }
 
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