module Tabs

# File lib/tabs/tabs.rb, line 43
def complete_task(key, token, timestamp=Time.now)
  raise MetricTypeMismatchError.new("Only task metrics can complete a task") unless metric_type(key) == "task"
  get_metric(key).complete(token, timestamp)
end

# File lib/tabs/tabs.rb, line 21
def config
  Config
end

# File lib/tabs/tabs.rb, line 13
def configure
  yield(Config)
end

# File lib/tabs/tabs.rb, line 61
def counter_total(key)
  unless metric_exists?(key)
    if block_given?
      return yield
    else
      raise UnknownMetricError.new("Unknown metric: #{key}")
    end
  end
  raise MetricTypeMismatchError.new("Only counter metrics can be incremented") unless metric_type(key) == "counter"
  get_metric(key).total
end

# File lib/tabs/tabs.rb, line 48
def create_metric(key, type)
  raise UnknownTypeError.new("Unknown metric type: #{type}") unless METRIC_TYPES.include?(type)
  raise DuplicateMetricError.new("Metric already exists: #{key}") if metric_exists?(key)
  hset "metrics", key, type
  metric_klass(type).new(key)
end

# File lib/tabs/tabs.rb, line 99
def drop_all_metrics!
  metrics = self.list_metrics
  metrics.each { |key| self.drop_metric! key }
end

# File lib/tabs/tabs.rb, line 92
def drop_metric!(key)
  raise UnknownMetricError.new("Unknown metric: #{key}") unless metric_exists?(key)
  metric = get_metric(key)
  metric.drop!
  hdel "metrics", key
end

# File lib/tabs/tabs.rb, line 104
def drop_resolution_for_metric!(key, resolution)
  raise UnknownMetricError.new("Unknown metric: #{key}") unless metric_exists?(key)
  raise ResolutionMissingError.new(resolution) unless Tabs::Resolution.all.include? resolution
  metric = get_metric(key)
  metric.drop_by_resolution!(resolution) unless metric_type(key) == "task"
end

# File lib/tabs/tabs.rb, line 55
def get_metric(key)
  raise UnknownMetricError.new("Unknown metric: #{key}") unless metric_exists?(key)
  type = hget("metrics", key)
  metric_klass(type).new(key)
end

# File lib/tabs/tabs.rb, line 73
def get_stats(key, period, resolution)
  raise UnknownMetricError.new("Unknown metric: #{key}") unless metric_exists?(key)
  metric = get_metric(key)
  metric.stats(period, resolution)
end

# File lib/tabs/tabs.rb, line 25
def increment_counter(key, timestamp=Time.now)
  create_metric(key, "counter") unless metric_exists?(key)
  raise MetricTypeMismatchError.new("Only counter metrics can be incremented") unless metric_type(key) == "counter"
  get_metric(key).increment(timestamp)
end

# File lib/tabs/tabs.rb, line 84
def list_metrics
  hkeys "metrics"
end

# File lib/tabs/tabs.rb, line 88
def metric_exists?(key)
  list_metrics.include? key
end

# File lib/tabs/tabs.rb, line 79
def metric_type(key)
  raise UnknownMetricError.new("Unknown metric: #{key}") unless metric_exists?(key)
  hget "metrics", key
end

# File lib/tabs/tabs.rb, line 31
def record_value(key, value, timestamp=Time.now)
  create_metric(key, "value") unless metric_exists?(key)
  raise MetricTypeMismatchError.new("Only value metrics can record a value") unless metric_type(key) == "value"
  get_metric(key).record(value, timestamp)
end

# File lib/tabs/tabs.rb, line 17
def redis
  Config.redis
end

# File lib/tabs/tabs.rb, line 37
def start_task(key, token, timestamp=Time.now)
  create_metric(key, "task")
  raise MetricTypeMismatchError.new("Only task metrics can start a task") unless metric_type(key) == "task"
  get_metric(key).start(token, timestamp)
end

# File lib/tabs/tabs.rb, line 113
def metric_klass(type)
  "Tabs::Metrics::#{type.classify}".constantize
end