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# Data model for epoch charts. By instantiating a model and passing it to each
# of the charts on a page the application programmer can update data once and
# have each of the charts respond accordingly.
#
# In addition to setting basic / historical data via the setData method, the
# model also supports the push method, which when used will cause real-time
# plots to automatically update and animate.
class Epoch.Model extends Epoch.Events
defaults =
dataFormat: null
# Creates a new Model.
# @option options dataFormat The default data fromat for the model.
# @option data Initial data for the model.
constructor: (options={}) ->
super()
options = Epoch.Util.defaults options, defaults
@dataFormat = options.dataFormat
@data = options.data
@loading = false
# Sets the model's data.
# @param data Data to set for the model.
# @event data:updated Instructs listening charts that new data is available.
setData: (data) ->
@data = data
@trigger 'data:updated'
# Pushes a new entry into the model.
# @param entry Entry to push.
# @event data:push Instructs listening charts that a new data entry is available.
push: (entry) ->
@entry = entry
@trigger 'data:push'
# Determines if the model has data.
# @return true if the model has data, false otherwise.
hasData: ->
@data?
# Retrieves and formats adata for the specific chart type and data format.
# @param [String] type Type of the chart for which to fetch the data.
# @param [String, Object] dataFormat (optional) Used to override the model's default data format.
# @return The model's data formatted based the parameters.
getData: (type, dataFormat) ->
dataFormat ?= @dataFormat
Epoch.Data.formatData @data, type, dataFormat
# Retrieves the latest data entry that was pushed into the model.
# @param [String] type Type of the chart for which to fetch the data.
# @param [String, Object] dataFormat (optional) Used to override the model's default data format.
# @return The model's next data entry formatted based the parameters.
getNext: (type, dataFormat) ->
dataFormat ?= @dataFormat
Epoch.Data.formatEntry @entry, type, dataFormat
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