class Langfuse::Generation

def create_generation
  data = {
    id: @id,
    trace_id: @trace_id,
    name: @name,
    start_time: @start_time,
    end_time: @end_time,
    completion_start_time: @completion_start_time,
    model: @model,
    model_parameters: @model_parameters,
    input: @input,
    output: @output,
    usage: @usage,
    metadata: @metadata,
    level: @level,
    status_message: @status_message,
    parent_observation_id: @parent_observation_id,
    version: @version
  }.merge(@kwargs).compact
  @client.enqueue_event('generation-create', data)
end

def end(output: nil, end_time: nil, usage: nil, **kwargs)
  @end_time = end_time || Utils.current_timestamp
  @output = output if output
  @usage.merge!(usage) if usage
  @kwargs.merge!(kwargs)
  update_generation
  self
end

def generation(name: nil, start_time: nil, end_time: nil, completion_start_time: nil,
               model: nil, model_parameters: nil, input: nil, output: nil, usage: nil,
               metadata: nil, level: nil, status_message: nil, version: nil, **kwargs)
  @client.generation(
    trace_id: @trace_id,
    name: name,
    start_time: start_time,
    end_time: end_time,
    completion_start_time: completion_start_time,
    model: model,
    model_parameters: model_parameters,
    input: input,
    output: output,
    usage: usage,
    metadata: metadata,
    level: level,
    status_message: status_message,
    parent_observation_id: @id,
    version: version,
    **kwargs
  )
end

def get_url
  "#{@client.host}/trace/#{@trace_id}?observation=#{@id}"
end

def initialize(client:, trace_id:, id: nil, name: nil, start_time: nil, end_time: nil,
               completion_start_time: nil, model: nil, model_parameters: nil, input: nil,
               output: nil, usage: nil, metadata: nil, level: nil, status_message: nil,
               parent_observation_id: nil, version: nil, **kwargs)
  @client = client
  @id = id || Utils.generate_id
  @trace_id = trace_id
  @name = name
  @start_time = start_time
  @end_time = end_time
  @completion_start_time = completion_start_time
  @model = model
  @model_parameters = model_parameters || {}
  @input = input
  @output = output
  @usage = usage || {}
  @metadata = metadata || {}
  @level = level
  @status_message = status_message
  @parent_observation_id = parent_observation_id
  @version = version
  @kwargs = kwargs
  # Create the generation
  create_generation
end

def score(name:, value:, data_type: nil, comment: nil, **kwargs)
  @client.score(
    observation_id: @id,
    name: name,
    value: value,
    data_type: data_type,
    comment: comment,
    **kwargs
  )
end

def span(name: nil, start_time: nil, end_time: nil, input: nil, output: nil,
         metadata: nil, level: nil, status_message: nil, version: nil, **kwargs)
  @client.span(
    trace_id: @trace_id,
    name: name,
    start_time: start_time,
    end_time: end_time,
    input: input,
    output: output,
    metadata: metadata,
    level: level,
    status_message: status_message,
    parent_observation_id: @id,
    version: version,
    **kwargs
  )
end

def to_dict
  {
    id: @id,
    trace_id: @trace_id,
    name: @name,
    start_time: @start_time,
    end_time: @end_time,
    completion_start_time: @completion_start_time,
    model: @model,
    model_parameters: @model_parameters,
    input: @input,
    output: @output,
    usage: @usage,
    metadata: @metadata,
    level: @level,
    status_message: @status_message,
    parent_observation_id: @parent_observation_id,
    version: @version
  }.merge(@kwargs).compact
end

def update(name: nil, end_time: nil, completion_start_time: nil, model: nil,
           model_parameters: nil, input: nil, output: nil, usage: nil, metadata: nil,
           level: nil, status_message: nil, version: nil, **kwargs)
  @name = name if name
  @end_time = end_time if end_time
  @completion_start_time = completion_start_time if completion_start_time
  @model = model if model
  @model_parameters.merge!(model_parameters) if model_parameters
  @input = input if input
  @output = output if output
  @usage.merge!(usage) if usage
  @metadata.merge!(metadata) if metadata
  @level = level if level
  @status_message = status_message if status_message
  @version = version if version
  @kwargs.merge!(kwargs)
  update_generation
  self
end

def update_generation
  data = {
    id: @id,
    trace_id: @trace_id,
    name: @name,
    start_time: @start_time,
    end_time: @end_time,
    completion_start_time: @completion_start_time,
    model: @model,
    model_parameters: @model_parameters,
    input: @input,
    output: @output,
    usage: @usage,
    metadata: @metadata,
    level: @level,
    status_message: @status_message,
    parent_observation_id: @parent_observation_id,
    version: @version
  }.merge(@kwargs).compact
  @client.enqueue_event('generation-update', data)
end