namespace = tf_events

pop_event = {
    id = tf_events.1
    hide_window = yes

    trigger = {
        pop_has_trait = trait_tf_viral_morph
    }

    mean_time_to_happen = {
        months = 12

        # Slaves have limited freedom of movement.
        modifier = {
            factor = 4
            has_citizenship_type = { type = citizenship_slavery }
        }

        # Assume that Pops that are being purged are isolated from the general
        # population.
        # Balance-wise, the idea is that purging is a valid strategy to get
        # rid of viral morphers, for those empires that find it ethically
        # acceptable. In particular it is overpowered if infecting an AI that
        # purges the morpher's species means the entire planet will end up
        # depopulated.
        # I haven't yet figured out what the infection rate should be to
        # make purging viable. At 120 months, you sometimes see a pop change,
        # but it's so rare that even large amounts of morphers can be purged
        # without ever risking losing much of the population.
        # TODO: There seems to be individual purging of Pops.
        #       Does that still exist in 2.2 or is it leftover code?
        modifier = {
            factor = 10
            has_citizenship_type = { type = citizenship_purge }
        }
    }

    immediate = {
        species = {
            save_global_event_target_as = tf_viral_morphed_species
        }

        planet = {
            random_pop = {
                pop_event = { id = tf_events.2 }
            }
        }
    }
}

# TODO: Chance of transforming leaders.
# TODO: Chance of transforming non-sapients?
# TODO: Add purge type for transforming?

pop_event = {
    id = tf_events.2
    hide_window = yes
    is_triggered_only = yes

    trigger = {
        species {
            # Can't transform if Pop is already of the target species.
            NOT = { is_same_species = event_target:tf_viral_morphed_species }
        }

        # Only organic species can transform.
        is_organic_species = yes

        owner = {
            # Don't infect sleeping fallen empires: weird things happen
            # in their jobs tab if they change species.
            NOT = { is_country_type = fallen_empire }
        }
    }

    immediate = {
        create_message = {
            hide_window = yes
            type = MESSAGE_TYPE_POP_VIRAL_MORPHED
            localization = MESSAGE_POP_VIRAL_MORPHED
            days = 30
            target = root
            variable = {
                type = name
                localization = SPECIES
                scope = root.species
            }
            variable = {
                type = name
                localization = MORPHER_SPECIES
                scope = event_target:tf_viral_morphed_species
            }
            variable = {
                type = name
                localization = PLANET
                scope = root.planet
            }
        }

        change_species = event_target:tf_viral_morphed_species

        # Avoid stacking the shock modifiers.
        remove_transformation_shock = yes

        # TODO: Should the duration and the modifier depend on ethics?
        add_modifier = {
            modifier = tf_changed_species_shock
            years = 5
        }
    }
}

# Make occupying armies also infect the population.
planet_event = {
    id = tf_events.3
    hide_window = yes

    trigger = {
        is_occupied_flag = yes
        controller = {
            has_trait = trait_tf_viral_morph
        }
    }

    mean_time_to_happen = {
        months = 12
    }

    immediate = {
        controller = {
            owner_species = {
                save_global_event_target_as = tf_viral_morphed_species
            }
        }

        planet = {
            random_pop = {
                pop_event = { id = tf_events.2 }
            }
        }
    }
}