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(ns unheard.time-object
(:require [missionary.core :as m]
[helins.interval.map :as imap]))
;; 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
[& 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))))
(def b
(phrase (a 0)
(a 1)
(lift (time-object 10 2 :x))
(lift (time-object 0 2 :y))))
(def c (phrase (b 0) (b 3)))
(c 0))
(defn timeline
"Primary timeline bookkeeping mehanism."
[{:keys [time-objects]}]
(let [m imap/empty]
(if (seq? time-objects)
(loop [time-objects time-objects
m m]
(let [{:keys [start duration value]} (first time-objects)
m (imap/mark m start (+ start duration) value)
rem (rest time-objects)]
(if (seq rem) (recur rem m) m)))
m)))
(comment
(def t (timeline (a 0)))
(def t (timeline (c 0)))
(get t 2))
(defn point-query
"Query a timeline. Returns a flow of time objects."
[timeline >at]
(m/ap (let [at (m/?< >at)] (get timeline at))))
(comment
(def at (atom 0))
(def >at (m/watch at))
(def cancel ((m/reduce prn nil (point-query t >at)) prn prn))
(reset! at 0)
(cancel))
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