[repo]
kind = "recipe"

[[stages]]

name = "master_flat"
description = "Generate master flat"
# disabled = true # can be used to prevent considering this stage (for debugging or whatever)

# We should normally be inheriting this from a common base stage definition
tool.name = "siril"

# Notice: the following script should be shared between dual duo **and** single duo workflows.  We shouldn't need to delcare it twice.
script = '''
    # Create a sequence from the raw flat frames
    link flat -out={process_dir}
    cd {process_dir}

    # Calibrate the flat frames using master bias
    calibrate flat -bias={input["bias"].full}

    # Stack the pre-processed (calibrated) flat frames
    stack pp_flat rej 3 3 -norm=mul -out={output.base}
    '''

[[stages.inputs]]
kind = "session"
type = "flat"

[[stages.inputs.requires]]
kind = "unprocessed" # master generation never wants to consume already processed frames

# Note: require clauses are evaluated in order.  So for 'min_count' we probably want to test that last, after all other filtering is done.
[[stages.inputs.requires]]
kind = "min_count"
value = 2          # siril needs at least 2 frames to stack, raise an exception if not enough frames found
accept_single = true # if only one frame is found, just reuse it as the output (no stacking needed)

[[stages.inputs]]
kind = "master"
type = "bias"

[[stages.outputs]]
kind = "master"