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(ns unheard.time-object
(:require [missionary.core :as m]
[unheard.interval :as i]))
;; TODO: Update description
(defn time-object
"A time-object takes a start time, and end time, and a value.
Value is a flow that will be consumed when the corresponding
time tree is consumed at a point in time within the time-object's
interval.
"
[start duration value]
{:start start, :duration duration, :value value})
(defn lift
"Lift collection of time objects to a phrase"
[& children]
{:start 0, :time-objects children})
;; BUG c9be408
(defn phrase
;; TODO: Description
[& children]
(fn [start]
{:start start,
:time-objects (for [child children
time-object (:time-objects child)]
(update time-object :start (partial + start)))}))
(comment
(def a (phrase (lift (time-object 0 4 :x)) (lift (time-object 0 4 :a))))
(def b
(phrase (a 0)
(a 1)
(lift (time-object 10 2 :x) (time-object 10 2 :b))
(lift (time-object 0 2 :y))))
(def c (phrase (b 0) (b 3)))
(c 0))
(defn phrase->spans [phrase]
(let [{:keys [time-objects]} (phrase 0)]
(map (fn [{:keys [start duration value]}] [start (+ start duration) value])
time-objects)))
(comment
(phrase->spans c))
(defn timeline
"Primary timeline bookkeeping mehanism."
[spans]
(let [c (i/create-ratio-interval-collection)]
(doall
(for [[start end value] spans]
(.add c (i/ratio-interval start end value))))
c))
(comment
(def t (timeline (phrase->spans c)))
(i/find-overlaps t (i/ratio-interval 0 1 nil))
(i/find-overlaps t (i/ratio-interval -1 0 nil)))
(defn point-query
"Query a timeline. Returns a flow of time objects."
[timeline >at]
(m/stream (m/ap (let [at (m/?< >at)]
(into #{}
(map #(.value %)
(i/find-overlaps timeline
(i/ratio-interval at at nil))))))))
(comment
(def at (atom 0))
(def >at (m/watch at))
(def cancel ((m/reduce prn nil (point-query t >at)) prn prn))
(reset! at 5)
(reset! at 14)
(cancel))
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