use crate::app_interface::list::ImmutableList;
use crate::app_interface::{
    Battle, DamageSource, DynamicLibrary, EffectParameter, ExecutingMove, Item, Pokemon, Statistic,
};
use crate::handling::ScriptCapabilities;
use crate::{ExternRef, ExternalReferenceType, ScriptPtr, StringKey, TurnChoice, TypeIdentifier};
use core::any::Any;
use core::fmt::Debug;

pub trait Script {
    fn new() -> Self
    where
        Self: Sized;
    fn get_name(&self) -> &'static str;
    fn get_capabilities(&self) -> &[ScriptCapabilities];

    /// This function is ran when a volatile effect is added while that volatile effect already is
    /// in place. Instead of adding the volatile effect twice, it will execute this function instead.
    fn stack(&self) {}
    /// This function is ran when this script stops being in effect, and is removed from its owner.
    fn on_remove(&self) {}

    /// This function is ran when this script starts being in effect.
    fn on_initialize(
        &self,
        _library: &DynamicLibrary,
        _parameters: Option<ImmutableList<EffectParameter>>,
    ) {
    }

    /// This function is ran just before the start of the turn. Everyone has made its choices here,
    /// and the turn is about to start. This is a great place to initialize data if you need to know
    /// something has happened during a turn.
    fn on_before_turn(&self, _choice: TurnChoice) {}

    /// This function allows you to modify the effective speed of the Pokemon. This is ran before
    /// turn ordering, so overriding here will allow you to put certain Pokemon before others.
    fn change_speed(&self, _choice: TurnChoice, _speed: &mut u32) {}
    /// This function allows you to modify the effective priority of the Pokemon. This is ran before
    /// turn ordering, so overriding here will allow you to put certain Pokemon before others. Note
    /// that this is only relevant on move choices, as other turn choice types do not have a priority.
    fn change_priority(&self, _choice: TurnChoice, _priority: &mut i8) {}

    /// This function allows you to change the move that is used during execution. This is useful for
    /// moves such as metronome, where the move chosen actually differs from the move used.
    fn change_move(&self, _choice: TurnChoice, _move_name: &mut StringKey) {}
    /// This function allows you to change a move into a multi-hit move. The number of hits set here
    /// gets used as the number of hits. If set to 0, this will behave as if the move missed on its
    /// first hit.
    fn change_number_of_hits(&self, _choice: TurnChoice, _number_of_hits: &mut u8) {}

    /// This function allows you to prevent a move from running. If this gets set to true, the move
    /// ends execution here. No PP will be decreased in this case.
    fn prevent_move(&self, _move: ExecutingMove, _prevent: &mut bool) {}
    /// This function makes the move fail. If the fail field gets set to true, the move ends execution,
    /// and fail events get triggered.
    fn fail_move(&self, _move: ExecutingMove, _fail: &mut bool) {}
    /// Similar to [`Self::prevent_move`]. This function will also stop execution, but PP will be
    /// decreased.
    fn stop_before_move(&self, _move: ExecutingMove, _stop: &mut bool) {}
    /// This function runs just before the move starts its execution.
    fn on_before_move(&self, _move: ExecutingMove) {}
    /// This function allows a script to prevent a move that is targeted at its owner. If set to true
    /// the move fails, and fail events get triggered.
    fn fail_incoming_move(&self, _move: ExecutingMove, _target: Pokemon, _fail: &mut bool) {}
    /// This function allows a script to make its owner invulnerable to an incoming move.
    fn is_invulnerable(&self, _move: ExecutingMove, _target: Pokemon, _invulnerable: &mut bool) {}
    /// This function occurs when a move gets missed. This runs on the scripts belonging to the executing
    /// move, which include the scripts that are attached to the owner of the script.
    fn on_move_miss(&self, _move: ExecutingMove, _target: Pokemon) {}
    /// This function allows the script to change the actual type that is used for the move on a target.
    fn change_move_type(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _move_type: &mut TypeIdentifier,
    ) {
    }
    /// This function allows the script to change how effective a move is on a target.
    fn change_effectiveness(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _effectiveness: &mut f32,
    ) {
    }
    /// This function allows a script to block an outgoing move from being critical.
    fn block_critical(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _block_critical: &mut bool,
    ) {
    }
    /// This function allows a script to block an incoming move from being critical.
    fn block_incoming_critical(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _block_critical: &mut bool,
    ) {
    }
    /// This function allows a script to modify the accuracy of a move used. This value represents
    /// the percentage accuracy, so anything above 100% will make it always hit.
    fn change_accuracy(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _accuracy: &mut u8,
    ) {
    }

    /// This function allows a script to change the critical stage of the move used.
    fn change_critical_stage(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _stage: &mut u8,
    ) {
    }
    /// This function allows a script to change the damage modifier of a critical hit. This will only
    /// run when a hit is critical.
    fn change_critical_modifier(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _modifier: &mut f32,
    ) {
    }
    /// This function allows a script to change the damage modifier of a Same Type Attack Bonus, which
    /// occurs when the user has the move type as one of its own types.
    fn change_stab_modifier(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _modifier: &mut f32,
    ) {
    }

    /// This function allows a script to change the effective base power of a move hit.
    fn change_base_power(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _base_power: &mut u8,
    ) {
    }
    /// This function allows a script to bypass defensive stat boosts for a move hit.
    fn bypass_defensive_stat_boost(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _bypass: &mut bool,
    ) {
    }
    /// This function allows a script to bypass offensive stat boosts for a move hit.
    fn bypass_offensive_stat_boost(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _bypass: &mut bool,
    ) {
    }
    /// This function allows a script to change the actual offensive stat values used when calculating damage
    fn change_offensive_stat_value(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _amount: &mut u32,
    ) {
    }
    /// This function allows a script to change the actual defensive stat values used when calculating damage.
    fn change_defensive_stat_value(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _amount: &mut u32,
    ) {
    }

    /// This function allows a script to change the raw modifier we retrieved from the stats of the
    /// defender and attacker.
    fn change_damage_stat_modifier(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _modifier: &mut f32,
    ) {
    }
    /// This function allows a script to apply a raw multiplier to the damage done by a move.
    fn change_damage_modifier(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _modifier: &mut f32,
    ) {
    }
    /// This function allows a script to modify the outgoing damage done by a move.
    fn change_damage(&self, _move: ExecutingMove, _target: Pokemon, _hit: u8, _damage: &mut u32) {}
    /// This function allows a script to modify the incoming damage done by a move.
    fn change_incoming_damage(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _damage: &mut u32,
    ) {
    }
    /// This function triggers when an incoming hit happens. This triggers after the damage is done,
    /// but before the secondary effect of the move happens.
    fn on_incoming_hit(&self, _move: ExecutingMove, _target: Pokemon, _hit: u8) {}
    /// This function triggers when an opponent on the field faints.
    fn on_opponent_faints(&self, _move: ExecutingMove, _target: Pokemon, _hit: u8) {}
    /// This function allows a script attached to a Pokemon or its parents to prevent stat boost
    /// changes on that Pokemon.
    fn prevent_stat_boost_change(
        &self,
        _target: Pokemon,
        _stat: Statistic,
        _amount: i8,
        _self_inflicted: bool,
        _prevent: &mut bool,
    ) {
    }
    /// This function allows a script attached to a Pokemon or its parents to modify the amount by
    /// which the stat boost will change. If the stat boost is done by the user itself, self
    /// inflicted will be true, otherwise it will be false.
    fn change_stat_boost_change(
        &self,
        _target: Pokemon,
        _stat: Statistic,
        _self_inflicted: bool,
        _amount: &mut i8,
    ) {
    }
    /// This function allows a script attached to a Pokemon or its parents to prevent an incoming
    /// secondary effect. This means the move will still hit and do damage, but not trigger its
    /// secondary effect. Note that this function is not called for status moves.
    fn prevent_secondary_effect(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _prevent: &mut bool,
    ) {
    }
    /// This function allows a script attached to a move or its parents to change the chance the
    /// secondary effect of a move will trigger. The chance is depicted in percentage here, so
    /// changing this to above or equal to 100 will make it always hit, while setting it to equal or
    /// below 0 will make it never hit.
    fn change_effect_chance(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _chance: &mut f32,
    ) {
    }
    /// This function allows a script attached to a Pokemon or its parents to change the chance the
    /// secondary effect of an incoming move will trigger. The chance is depicted in percentage here,
    /// so changing this to above or equal to 100 will make it always hit, while setting it to equal
    /// or below 0 will make it never hit.
    fn change_incoming_effect_chance(
        &self,
        _move: ExecutingMove,
        _target: Pokemon,
        _hit: u8,
        _chance: &mut f32,
    ) {
    }
    /// This function triggers when the move uses its secondary effect. Moves should implement their
    /// secondary effects here. Status moves should implement their actual functionality in this
    /// function as well, as status moves effects are defined as secondary effects for simplicity.
    fn on_secondary_effect(&self, _move: ExecutingMove, _target: Pokemon, _hit: u8) {}
    /// This function triggers on a move or its parents when all hits on a target are finished.
    fn on_after_hits(&self, _move: ExecutingMove, _target: Pokemon) {}
    /// This function prevents the Pokemon it is attached to from being able to switch out.
    fn prevent_self_switch(&self, _choice: TurnChoice, _prevent: &mut bool) {}
    /// This function allows the prevention of switching for any opponent.
    fn prevent_opponent_switch(&self, _choice: TurnChoice, _prevent: &mut bool) {}
    /// This function is called on a move and its parents when the move fails.
    fn on_fail(&self, _target: Pokemon) {}
    /// This function is called on a script when an opponent fails.
    fn on_opponent_fail(&self, _target: Pokemon) {}
    /// This function allows preventing the running away of the Pokemon its attached to
    fn prevent_self_run_away(&self, _choice: TurnChoice, _prevent: &mut bool) {}
    /// This function prevents a Pokemon on another side than where its attached to from running away.
    fn prevent_opponent_run_away(&self, _choice: TurnChoice, _prevent: &mut bool) {}
    /// This function id triggered on all scripts active in the battle after all choices have finished
    /// running. Note that choices are not active anymore here, so their scripts do not call this
    /// function.
    fn on_end_turn(&self) {}
    /// This function is triggered on a Pokemon and its parents when the given Pokemon takes damage.
    fn on_damage(
        &self,
        _pokemon: Pokemon,
        _source: DamageSource,
        _old_health: u32,
        _new_health: u32,
    ) {
    }
    /// This function is triggered on a Pokemon and its parents when the given Pokemon faints.
    fn on_faint(&self, _pokemon: Pokemon, _source: DamageSource) {}
    /// This function is triggered on a Pokemon and its parents when the given Pokemon is switched into
    /// the battlefield.
    fn on_switch_in(&self, _pokemon: Pokemon) {}
    /// This function is triggered on a Pokemon and its parents when the given Pokemon consumes the
    /// held item it had.
    fn on_after_held_item_consume(&self, _pokemon: Pokemon, _item: &Item) {}
    /// This function is triggered on a Pokemon and its parents when the given Pokemon gains experience,
    /// and allows for changing this amount of experience.
    fn change_experience_gained(
        &self,
        _fainted_mon: Pokemon,
        _winning_mon: Pokemon,
        _amount: &mut u32,
    ) {
    }
    /// This function is triggered on a Pokemon and its parents when the given Pokemon gains experience,
    /// and allows for making the experience be shared across multiple Pokemon.
    fn share_experience(&self, _fainted_mon: Pokemon, _winning_mon: Pokemon, _shares: &mut bool) {}
    /// This function is triggered on a battle and its parents when something attempts to change the
    /// weather, and allows for blocking the weather change.
    fn block_weather(&self, _battle: Battle, _blocked: &mut bool) {}
    /// This function is called when a Pokeball is thrown at a Pokemon, and allows modifying the catch
    /// rate of this attempt. Pokeball modifier effects should be implemented here, as well as for
    /// example status effects that change capture rates.
    fn change_capture_rate_bonus(&self, _target: Pokemon, _pokeball: Item, _modifier: &mut u8) {}

    fn as_any(&self) -> &dyn Any;

    #[cfg(not(feature = "mock_data"))]
    fn get_owner<T>(&self) -> Option<T>
    where
        T: ExternalReferenceType,
        Self: Sized,
    {
        unsafe {
            script_get_owner(ScriptPtr::from_existing(self))
                .cast::<T>()
                .get_value()
        }
    }
}

impl Debug for dyn Script {
    fn fmt(&self, _f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        core::fmt::Result::Ok(())
    }
}

#[cfg(not(feature = "mock_data"))]
extern "wasm" {
    fn script_get_owner(pointer: ScriptPtr) -> ExternRef<u8>;
}