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(ns unheard.theory
(:require [missionary.core :as m]
[unheard.time-object :refer
[time-object lift phrase timeline point-query]]
[unheard.util.missionary :refer [reconcile-merge]]))
(defn note
[>clock start duration >value]
(lift (time-object
start
duration
(m/stream (m/ap (let [[c v] (m/?> (m/relieve
(m/latest vector >clock >value)))]
v))))))
;; BUG: 2d7f861
(defn read
[>clock timeline]
(m/relieve (m/reductions
{}
nil
(m/eduction
(map vals)
(m/reductions
(fn [acc {:keys [id state value]}]
(if (= :up state) (assoc acc id value) (dissoc acc id)))
{}
(reconcile-merge (point-query timeline >clock)))))))
(comment
(def c (atom 0))
(def >c (m/signal (m/watch c)))
(def v (atom 0))
(def >v (m/signal (m/watch v)))
(def song (phrase (note >c 4 8 >v) (note >c 6 6 >v)))
(def t (timeline song))
(def cancel ((m/reduce prn nil (read >c t)) prn prn))
(cancel)
(swap! c dec)
(swap! c inc)
(swap! v inc)
(swap! v dec))
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