[repo]
kind = "recipe"

[recipe]
description = "Generate an 'HOO' (bicolor) palette from HaOiii data. R=Ha, G/B=OIII, giving natural red nebulosity with teal/blue OIII."

[[stages]]

name = "palette_hoo"
description = "HOO palette: R=Ha, G=OIII (optionally blended with Ha), B=OIII"
tool.name = "siril"
#role = "palette" 

# Channels are selected out of the prior stage outputs by filename suffix
# (_Ha / _OIII). We load them by absolute path and re-save under canonical
# names so Siril PixelMath ($Ha$ / $OIII$) can reference them.
#
# The green line is a single template expression: green is OIII, optionally
# blended with a little Ha (green_ha_weight) to tune the teal hue.
script = '''
    # Bring the noise-reduced Ha and OIII channels in under canonical names.
    # Rescale each to 0..1 so both channels enter rgbcomp on the same footing.
    load {[str(p) for p in input["ha"].full_paths if "_Ha" in str(p)][0]}
    save Ha
    pm "$Ha$" -rescale 0.0 1.0
    save Ha
    load {[str(p) for p in input["oiii"].full_paths if "_OIII" in str(p)][0]}
    save OIII
    pm "$OIII$" -rescale 0.0 1.0
    save OIII

    # Green channel: OIII, optionally blended with a little Ha to shift the hue.
    pm "$Ha$ * {parameters.green_ha_weight} + $OIII$ * {1.0 - parameters.green_ha_weight}" -rescale 0.0 1.0
    save Green

    # Merge into an HOO image: R=Ha, G=Green (OIII/blend), B=OIII
    rgbcomp Ha Green OIII -out=results

    # Move to the final output location
    load results
    save "{output.full_paths[0]}"
    '''

[[stages.inputs]]
kind = "job"
name = "ha"
# Keep the required Ha channel in its own input group.  Its min_count is
# evaluated for this group, not against the one-file multiplexed noise task.
after = "denoise" # the role name: whichever denoiser will actually run

[[stages.inputs.requires]]
kind = "metadata"
name = "filter"
value = ["HaOiii", "SiiOiii"]

[[stages.inputs.requires]]
kind = "filename"
value = "_Ha"

[[stages.inputs.requires]]
kind = "min_count"
value = 1

[[stages.inputs]]
kind = "job"
name = "oiii"
# OIII is required in a separate input group for the same reason.
after = "denoise" # the role name: whichever denoiser will actually run

[[stages.inputs.requires]]
kind = "metadata"
name = "filter"
value = ["HaOiii", "SiiOiii"]

[[stages.inputs.requires]]
kind = "filename"
value = "_OIII"

[[stages.inputs.requires]]
kind = "min_count"
value = 1

[[stages.outputs]]
kind = "processed"
name = ["HOO.fits"]

[[stages.parameters]]
name = "green_ha_weight"
default = 0.0                                                                                   # Value used if not overriden
description = "Ha contribution mixed into the green (OIII) channel (0..1); 0 = pure OIII green"