use rand::{thread_rng, Rng};
use uuid::Uuid;

use cryp::{Cryp, CrypEffect, Stat};

#[derive(Debug,Clone,PartialEq,Serialize,Deserialize)]
pub struct Cast {
    pub id: Uuid,
    pub skill: Skill,
    pub source_team_id: Uuid,
    pub source_cryp_id: Uuid,
    pub target_cryp_id: Uuid,
    pub resolution: Resolution,
}

impl Cast {
    pub fn new(source_cryp_id: Uuid, source_team_id: Uuid, target_cryp_id: Uuid, skill: Skill) -> Cast {
        return Cast {
            id: Uuid::new_v4(),
            source_cryp_id,
            source_team_id,
            target_cryp_id,
            skill,
            resolution: Resolution::new(skill),
        };
    }

    pub fn new_tick(source: &mut Cryp, target: &mut Cryp, skill: Skill) -> Cast {
        Cast::new(source.id, source.account, target.id, skill)
    }

    pub fn set_resolution(&mut self, cryp: &mut Cryp, target: &mut Cryp) -> &mut Cast {
        self.resolution = self.skill.resolve(cryp, target);
        self
    }

    pub fn used_cooldown(&self) -> bool {
        return self.skill.base_cd().is_some();
    }
}


#[derive(Debug,Clone,PartialEq,Serialize,Deserialize)]
pub struct Immunity {
    pub immune: bool,
    pub effects: Vec<Effect>
}

impl Immunity {
    fn new() -> Immunity {
        Immunity { immune: false, effects: vec![] }
    }
}

#[derive(Debug,Clone,PartialEq,Serialize,Deserialize)]
pub struct Disable {
    pub disabled: bool,
    pub effects: Vec<Effect>
}

impl Disable {
    fn new() -> Disable {
        Disable { disabled: false, effects: vec![] }
    }
}

#[derive(Debug,Clone,PartialEq,Serialize,Deserialize)]
pub enum ResolutionResult {
    Damage { amount: u64, category: Category , immunity: Immunity },
    Healing { amount: u64, overhealing: u64, category: Category , immunity: Immunity },
    Effect { effect: Effect, duration: u8, immunity: Immunity },
    Removal { effect: Effect, immunity: Immunity },
}

#[derive(Debug,Clone,PartialEq,Serialize,Deserialize)]
pub struct Resolution {
    pub skill: Skill,
    pub disable: Disable,
    pub results: Vec<ResolutionResult>,
}

impl Resolution {
    fn new(skill: Skill) -> Resolution {
        Resolution { skill, results: vec![], disable: Disable::new() }
    }
}

pub type Cooldown = Option<u8>;

#[derive(Debug,Clone,Copy,PartialEq,Serialize,Deserialize)]
pub enum Effect {
    // physical
    Stun,
    Parry,
    Block,
    Bleed,
    Leech,
    Airborne,
    Untouchable,
    Deadly,
    Vulnerable,
    Fury,
    Evasion,
    Blind,
    Snare,

    Empower,

    // magic
    Hex,
    Curse,
    Banish,
    Slow,
    Haste,
    Enslave,
    Mesmerise,
    Amplify,
    Silence,

    // magic immunity
    Shield,

    // effects over time
    Triage,
    Decay,
    Regen,
    Drain,

    SpeedDrain,
    SpeedIncrease,

    Ko,
}

impl Effect {
    pub fn immune(&self, skill: Skill) -> bool {
        match self {
            Effect::Parry => match skill.category() {
                Category::Spell => false,
                Category::Physical => true,
                _ => false,
            },
            Effect::Shield => match skill.category() {
                Category::Spell => true,
                Category::Physical => false,
                _ => false,
            },
            Effect::Evasion => match skill.category() {
                Category::Spell => false,
                Category::Physical => evade_roll(),
                _ => false,
            },
            Effect::Banish => true,
            _ => false,
        }
    }

    pub fn disables_skill(&self, skill: Skill) -> bool {
        match self {
            Effect::Stun => true,
            Effect::Hex => true,
            Effect::Banish => true,
            Effect::Silence => match skill.category() {
                Category::Spell => true,
                Category::Physical => false,
                _ => false,
            },
            Effect::Snare => match skill.category() {
                Category::Spell => false,
                Category::Physical => true,
                _ => false,
            },

            Effect::Ko => match skill.category() {
                Category::SpellTick => false,
                _ => true,
            },
            _ => false,
        }
    }

    pub fn modifications(&self) -> Vec<Stat> {
        match self {
            Effect::Empower => vec![Stat::PhysicalDamage],
            Effect::Vulnerable => vec![Stat::PhysicalDamageTaken],
            Effect::Block => vec![Stat::PhysicalDamageTaken],

            Effect::Amplify => vec![Stat::SpellDamage],
            Effect::Curse => vec![Stat::SpellDamageTaken],
            _ => vec![],
        }
    }

    // maybe increase by rng
    // roll little endian bits
    // and OR with base stat
    pub fn apply(&self, value: u64) -> u64 {
        match self {
            Effect::Empower     => value << 1,
            Effect::Vulnerable  => value << 1,
            Effect::Block       => value >> 1,

            Effect::Amplify     => value << 1,
            Effect::Curse       => value << 1,
            _ => {
                println!("{:?} does not have a mod effect", self);
                return value;
            },
        }
    }

    pub fn category(&self) -> Category {
        match self {
            // physical
            Effect::Stun => Category::PhysDebuff,
            Effect::Block => Category::PhysBuff,
            Effect::Parry => Category::PhysBuff,
            Effect::Bleed => Category::PhysDebuff,
            Effect::Leech => Category::PhysDebuff,
            Effect::Airborne => Category::PhysDebuff,
            Effect::Untouchable => Category::PhysBuff,
            Effect::Deadly => Category::PhysBuff,
            Effect::Vulnerable => Category::PhysDebuff,
            Effect::Fury => Category::PhysBuff,
            Effect::Evasion => Category::PhysBuff,
            Effect::Blind => Category::PhysDebuff,
            Effect::Snare => Category::PhysDebuff,

            Effect::Empower => Category::PhysBuff,

            // magic
            Effect::Hex => Category::SpellDebuff,
            Effect::Curse => Category::SpellDebuff,
            Effect::Banish => Category::SpellDebuff, // todo randomise
            Effect::Slow => Category::SpellDebuff,
            Effect::Haste => Category::SpellBuff,
            Effect::Enslave => Category::SpellDebuff,
            Effect::Mesmerise => Category::SpellDebuff,
            Effect::Amplify => Category::SpellBuff,
            Effect::Silence => Category::SpellDebuff,

            // magic immunity
            Effect::Shield => Category::SpellBuff,

            // effects over time
            Effect::Triage => Category::SpellBuff,
            Effect::Decay => Category::SpellDebuff,
            Effect::Regen => Category::SpellBuff,
            Effect::Drain => Category::SpellDebuff,

            Effect::SpeedDrain => Category::SpellDebuff,
            Effect::SpeedIncrease => Category::SpellBuff,

            Effect::Ko => Category::Ko,
        }
    }

    pub fn duration(&self) -> u8 {
        match self {
            Effect::Evasion => 1,
            Effect::Block => 1,
            Effect::Parry => 1,

            Effect::Stun => 2,
            Effect::Vulnerable => 2,
            Effect::Snare => 1,

            Effect::Empower => 2,

            Effect::Decay => 2,
            Effect::Drain => 2,
            Effect::Triage => 2,

            Effect::Amplify => 2,
            Effect::Silence => 2,

            _ => {
                println!("{:?} does not have a duration", self);
                return 1;
            },
        }
    }

}

#[derive(Debug,Clone,Copy,PartialEq,Serialize,Deserialize)]
pub enum Category {
    Physical,
    PhysHeal,
    PhysDmg,
    PhysDebuff,
    PhysBuff,
    PhysTick,
    Spell,
    SpellDmg,
    SpellHeal,
    SpellDebuff,
    SpellBuff,
    SpellTick,
    Ko,
}

#[derive(Debug,Clone,Copy,PartialEq,Serialize,Deserialize)]
pub enum Skill {
    Attack,

    // -----------------
    // Nature
    // -----------------
    Block, // reduce dmg
    Parry, // avoid all dmg
    Snare,

    Paralyse,

    Strangle, // physical dot and disable

    Stun,
    Evade, // actively evade
    Evasion, // adds evasion to cryp


    // -----------------
    // Technology
    // -----------------
    Replicate,
    Swarm,
    Orbit,
    Repair,
    Scan, // track?

    // -----------------
    // Nonviolence
    // -----------------
    Heal,
    Triage, // hot
    TriageTick,
    Throw, // no dmg stun, adds vulnerable
    Charm,
    Calm,
    Rez,

    // Sleep,
    // Nightmare,

    // -------------------
    // Destruction
    // -------------------
    Blast,
    Amplify,
    Decay, // dot
    DecayTick, // dot
    Drain,
    DrainTick,
    Curse,
    Plague, // aoe dot
    Ruin, // aoe

    // -----------------
    // Purity
    // -----------------
    Empower,
    Slay,
    Shield,
    Silence,
    Inquiry,
    Purify,
    Purge,
    // Precision,

    // -----------------
    // Chaos
    // -----------------
    Banish,
    Hex,
    Fear,
    Taunt,
    Pause, // speed slow

    // used by tests, no cd, no dmg
    TestTouch,
    TestStun,
    TestBlock,
    TestParry,
    TestDrain,
}

impl Skill {
    pub fn base_cd(&self) -> Cooldown {
        match self {
            Skill::Attack => None,

            // -----------------
            // Nature
            // -----------------
            Skill::Block => Some(1), // reduce dmg
            Skill::Parry => Some(1), // avoid all dmg
            Skill::Snare => Some(2),

            Skill::Paralyse => Some(2),
            Skill::Strangle => Some(3),

            // Strangle

            Skill::Stun => Some(1),
            Skill::Evade => None,
            Skill::Evasion => Some(1), // additional layer of dmg avoidance

            // -----------------
            // Technology
            // -----------------
            Skill::Replicate => Some(1),
            Skill::Swarm => Some(3),
            Skill::Orbit => Some(2),
            Skill::Repair => Some(1),
            Skill::Scan => Some(2), // track?

            // -----------------
            // Preservation
            // -----------------
            Skill::Heal => Some(1),
            Skill::Triage => Some(1), // hot
            Skill::TriageTick => None,
            Skill::Throw => Some(2), // no dmg stun, adds vulnerable
            Skill::Charm => Some(2),
            Skill::Calm => Some(2),
            Skill::Rez => Some(4),

            // -----------------
            // Destruction
            // -----------------
            Skill::Blast => None,
            Skill::Amplify => Some(2),
            Skill::Decay => Some(1), // dot
            Skill::DecayTick => None,
            Skill::Drain => Some(3),
            Skill::DrainTick => None,
            Skill::Curse => Some(2),
            Skill::Plague => Some(2), // aoe dot
            Skill::Ruin => Some(3), // aoe

            // -----------------
            // Purity
            // -----------------
            // Skill::Precision => Some(1),
            Skill::Empower => Some(2),
            Skill::Slay => Some(1),
            Skill::Shield => Some(1),
            Skill::Silence => Some(2),
            Skill::Inquiry => Some(2),
            Skill::Purify => Some(1),
            Skill::Purge => Some(1),

            // -----------------
            // Chaos
            // -----------------
            Skill::Banish => Some(2),
            Skill::Hex => Some(1),
            Skill::Fear => Some(1),
            Skill::Taunt => Some(2),
            Skill::Pause => Some(2), // speed slow

            // -----------------
            // Test
            // -----------------
            Skill::TestTouch => None,
            Skill::TestStun => None,
            Skill::TestBlock => None,
            Skill::TestDrain => None,
            Skill::TestParry => None,
        }
    }

    pub fn category(&self) -> Category {
        match self {
            Skill::Attack => Category::Physical,

            // -----------------
            // Nature
            // -----------------
            Skill::Block => Category::Physical, // reduce dmg
            Skill::Evade => Category::Physical,
            Skill::Parry => Category::Physical, // avoid all dmg
            Skill::Snare => Category::Physical,

            Skill::Paralyse => Category::Physical,
            Skill::Strangle => Category::Physical,

            // Strangle

            Skill::Stun => Category::Physical,
            Skill::Evasion => Category::Physical, // additional layer of dmg avoidance

            // -----------------
            // Technology
            // -----------------
            Skill::Replicate => Category::Physical,
            Skill::Swarm => Category::Physical,
            Skill::Orbit => Category::Physical,
            Skill::Repair => Category::Physical,
            Skill::Scan => Category::Physical, // track?

            // -----------------
            // Preservation
            // -----------------
            Skill::Heal => Category::Physical,
            Skill::Triage => Category::Spell, // hot
            Skill::TriageTick => Category::SpellTick, // hot
            Skill::Throw => Category::Physical, // no dmg stun, adds vulnerable
            Skill::Charm => Category::Spell,
            Skill::Calm => Category::Physical,
            Skill::Rez => Category::Spell,

            // -----------------
            // Destruction
            // -----------------
            Skill::Blast => Category::Spell,
            Skill::Amplify => Category::Spell,
            Skill::Decay => Category::Spell, // dot
            Skill::DecayTick => Category::SpellTick, // hot
            Skill::Drain => Category::Spell,
            Skill::DrainTick => Category::SpellTick, // hot
            Skill::Curse => Category::Spell,
            Skill::Plague => Category::Spell, // aoe dot
            Skill::Ruin => Category::Spell, // aoe

            // -----------------
            // Purity
            // -----------------
            // Skill::Precision => 1,
            Skill::Empower => Category::Physical,
            Skill::Slay => Category::Physical,
            Skill::Shield => Category::Spell,
            Skill::Silence => Category::Spell,
            Skill::Inquiry => Category::Spell,
            Skill::Purify => Category::Spell,
            Skill::Purge => Category::Spell,

            // -----------------
            // Chaos
            // -----------------
            Skill::Banish => Category::Spell,
            Skill::Hex => Category::Spell,
            Skill::Fear => Category::Spell,
            Skill::Taunt => Category::Spell,
            Skill::Pause => Category::Spell, // extend durations
            // Skill::Lag => 2, //

            // -----------------
            // Test
            // -----------------
            Skill::TestTouch => Category::Physical,
            Skill::TestStun => Category::Physical,
            Skill::TestParry => Category::Physical,
            Skill::TestBlock => Category::Physical,
            Skill::TestDrain => Category::Spell,
        }
    }

    pub fn ko_castable(&self) -> bool {
        match self {
            Skill::TriageTick => true,
            Skill::DecayTick => true,
            Skill::DrainTick => true,
            _ => false,
        }
    }

    pub fn speed(&self) -> u8 {
        match self {
            Skill::Attack => 5,

            // -----------------
            // Nature
            // -----------------
            Skill::Block => 10, // reduce dmg
            Skill::Evade => 10,
            Skill::Parry => 10, // avoid all dmg
            Skill::Snare => 10,

            Skill::Paralyse => 5,
            Skill::Strangle => 5,

            // Strangle

            Skill::Stun => 5,
            Skill::Evasion => 3, // additional layer of dmg avoidance

            // -----------------
            // Technology
            // -----------------
            Skill::Replicate => 1,
            Skill::Swarm => 3,
            Skill::Orbit => 2,
            Skill::Repair => 1,
            Skill::Scan => 2, // track?

            // -----------------
            // Preservation
            // -----------------
            Skill::Heal => 1,
            Skill::Triage => 1, // hot
            Skill::TriageTick => 1, // hot
            Skill::Throw => 2, // no dmg stun, adds vulnerable
            Skill::Charm => 2,
            Skill::Calm => 2,
            Skill::Rez => 4,

            // -----------------
            // Destruction
            // -----------------
            Skill::Blast => 1,
            Skill::Amplify => 2,
            Skill::Decay => 1, // dot
            Skill::DecayTick => 2, // hot
            Skill::Drain => 2,
            Skill::DrainTick => 2, // hot
            Skill::Curse => 2,
            Skill::Plague => 2, // aoe dot
            Skill::Ruin => 3, // aoe

            // -----------------
            // Purity
            // -----------------
            // Skill::Precision => 1,
            Skill::Empower => 2,
            Skill::Slay => 1,
            Skill::Shield => 1,
            Skill::Silence => 2,
            Skill::Inquiry => 2,
            Skill::Purify => 1,
            Skill::Purge => 1,

            // -----------------
            // Chaos
            // -----------------
            Skill::Banish => 2,
            Skill::Hex => 1,
            Skill::Fear => 1,
            Skill::Taunt => 2,
            Skill::Pause => 2, // extend durations
            // Skill::Lag => 2, //

            // -----------------
            // Test
            // -----------------
            Skill::TestTouch => 10,
            Skill::TestStun => 5,
            Skill::TestBlock => 10,
            Skill::TestParry => 10,
            Skill::TestDrain => 10,
        }
    }

    pub fn resolve(&self, cryp: &mut Cryp, target: &mut Cryp) -> Resolution {
        let mut rng = thread_rng();
        let _base: u64 = rng.gen();

        let resolution = Resolution { skill: *self, results: vec![], disable: cryp.disabled(*self) };

        if target.is_ko() {
            return resolution;
        }

        if resolution.disable.disabled {
            return resolution;
        }

        match self {
            Skill::Attack => attack(cryp, target, resolution),
            // -----------------
            // Nature
            // -----------------
            Skill::Block => block(cryp, target, resolution),
            Skill::Parry => parry(cryp, target, resolution),
            Skill::Evade => evade(cryp, target, resolution),
            Skill::Snare => snare(cryp, target, resolution), // TODO prevent physical moves

            Skill::Paralyse => panic!("nyi"), // no physical moves
            Skill::Strangle => panic!("nyi"), // no physical moves

            Skill::Stun => stun(cryp, target, resolution),
            Skill::Evasion => evade(cryp, target, resolution), // additional layer of dmg avoidance

            // -----------------
            // Technology
            // -----------------
            Skill::Replicate => panic!("nyi"),
            Skill::Swarm => panic!("nyi"),
            Skill::Orbit => panic!("nyi"),
            Skill::Repair => panic!("nyi"),
            Skill::Scan => panic!("nyi"), // track?

            // -----------------
            // Preservation
            // -----------------
            Skill::Heal => heal(cryp, target, resolution),
            Skill::Triage => triage(cryp, target, resolution), // hot
            Skill::TriageTick => triage_tick(cryp, target, resolution), // hot
            Skill::Throw => throw(cryp, target, resolution), // no dmg stun, adds vulnerable
            Skill::Charm => panic!("nyi"), // target casts random spell on teammate
            Skill::Calm => panic!("nyi"), // physical fear, taunt removal
            Skill::Rez => panic!("nyi"),

            // -----------------
            // Destruction
            // -----------------
            Skill::Blast => blast(cryp, target, resolution),
            Skill::Amplify => amplify(cryp, target, resolution), // increase magic dmg
            Skill::Decay => decay(cryp, target, resolution), // dot
            Skill::DecayTick => decay_tick(cryp, target, resolution), // hot
            Skill::Drain => drain(cryp, target, resolution),
            Skill::DrainTick => drain_tick(cryp, target, resolution), // hot
            Skill::Curse => curse(cryp, target, resolution),
            Skill::Plague => panic!("nyi"), // dot that spreads every turn
            Skill::Ruin => panic!("nyi"), // aoe version of blast

            // -----------------
            // Purity
            // -----------------
            // Skill::Precision => panic!("nyi"),
            Skill::Empower => empower(cryp, target, resolution), // increased phys dmg
            Skill::Slay => panic!("nyi"), // phys dmg mult by target magic dmg
            Skill::Shield => shield(cryp, target, resolution), // target is immune to magic dmg and fx
            Skill::Silence => silence(cryp, target, resolution), // target cannot cast spells
            Skill::Inquiry => panic!("nyi"), //
            Skill::Purify => purify(cryp, target, resolution), // dispel all debuffs
            Skill::Purge => purge(cryp, target, resolution), // dispel all buffs

            // -----------------
            // Chaos
            // -----------------
            Skill::Banish => banish(cryp, target, resolution), // TODO prevent all actions
            Skill::Hex => hex(cryp, target, resolution), // todo prevent casting
            Skill::Fear => panic!("nyi"), // cast random spell on self
            Skill::Taunt => panic!("nyi"), // target forced to attack
            Skill::Pause => panic!("nyi"), // speed slow

            // -----------------
            // Test
            // -----------------
            Skill::TestTouch => Resolution { skill: Skill::TestTouch, results: vec![], disable: Disable::new() },
            Skill::TestStun => stun(cryp, target, resolution),
            Skill::TestBlock => block(cryp, target, resolution),
            Skill::TestParry => parry(cryp, target, resolution),
            Skill::TestDrain => drain(cryp, target, resolution),
        }
    }

    pub fn self_targeting(&self) -> bool {
        match self {
            Skill::Block => true,
            Skill::Evasion => true,
            Skill::Parry => true,
            Skill::TestBlock => true,
            Skill::TestParry => true,
            _ => false,
        }
    }
}

fn attack(cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let amount = cryp.phys_dmg();
    resolution.results.push(target.deal_phys_dmg(Skill::Attack, amount));
    return resolution;
}

fn stun(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let effect = CrypEffect { effect: Effect::Stun, duration: Effect::Stun.duration(), tick: None };
    resolution.results.push(target.add_effect(Skill::Stun, effect));
    return resolution;
}

fn throw(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let stun = CrypEffect { effect: Effect::Stun, duration: Effect::Stun.duration(), tick: None };
    let vulnerable = CrypEffect { effect: Effect::Vulnerable, duration: Effect::Vulnerable.duration(), tick: None };

    resolution.results.push(target.add_effect(Skill::Throw, stun));
    resolution.results.push(target.add_effect(Skill::Throw, vulnerable));

    return resolution;
}


fn block(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let block = CrypEffect { effect: Effect::Block, duration: Effect::Block.duration(), tick: None };
    resolution.results.push(target.add_effect(Skill::Block, block));
    return resolution;
}

fn parry(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let effect = CrypEffect { effect: Effect::Parry, duration: Effect::Parry.duration(), tick: None };
    resolution.results.push(target.add_effect(Skill::Parry, effect));
    return resolution;
}


fn evade(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let evade = CrypEffect { effect: Effect::Evasion, duration: Effect::Evasion.duration(), tick: None };
    resolution.results.push(target.add_effect(Skill::Evade, evade));
    return resolution;
}

fn evade_roll() -> bool {
    let mut rng = thread_rng();
    return rng.gen_bool(0.5);
}

fn snare(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let snare = CrypEffect { effect: Effect::Snare, duration: Effect::Snare.duration(), tick: None };
    resolution.results.push(target.add_effect(Skill::Snare, snare));
    return resolution;
}

fn empower(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let empower = CrypEffect { effect: Effect::Empower, duration: Effect::Empower.duration(), tick: None };
    resolution.results.push(target.add_effect(Skill::Empower, empower));
    return resolution;
}

// TODO put overhealing back
fn heal(cryp: &mut Cryp, _target: &mut Cryp, resolution: Resolution) -> Resolution {
    let _amount = cryp.phys_dmg();
    return resolution;

}

fn triage(cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let triage = CrypEffect {
        effect: Effect::Triage,
        duration: Effect::Triage.duration(),
        tick: Some(Cast::new_tick(cryp, target, Skill::TriageTick)),
    };
    let immunity = target.immune(Skill::Triage);
    let immune = immunity.immune;

    let snare_result = ResolutionResult::Effect {
        effect: triage.effect,
        duration: triage.duration,
        immunity,
    };

    resolution.results.push(snare_result);

    if !immune {
        target.effects.push(triage);
    }

    return resolution;
}

fn triage_tick(cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let amount = cryp.spell_dmg().wrapping_div(2);
    resolution.results.push(target.heal(Skill::TriageTick, amount));
    return resolution;
}

fn blast(cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let amount = cryp.spell_dmg();
    resolution.results.push(target.deal_spell_dmg(Skill::Blast, amount));
    return resolution;
}

fn amplify(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let amplify = CrypEffect { effect: Effect::Amplify, duration: Effect::Amplify.duration(), tick: None };
    resolution.results.push(target.add_effect(Skill::Amplify, amplify));
    return resolution;;
}

fn decay(cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let decay = CrypEffect {
        effect: Effect::Decay,
        duration: Effect::Decay.duration(),
        tick: Some(Cast::new_tick(cryp, target, Skill::DecayTick)),
    };
    resolution.results.push(target.add_effect(Skill::Decay, decay));
    return resolution;
}

fn decay_tick(cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let amount = cryp.spell_dmg();
    resolution.results.push(target.deal_spell_dmg(Skill::DecayTick, amount));
    return resolution;
}

fn hex(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let hex = CrypEffect { effect: Effect::Hex, duration: Effect::Hex.duration(), tick: None };
    resolution.results.push(target.add_effect(Skill::Hex, hex));
    return resolution;;
}

fn curse(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let curse = CrypEffect { effect: Effect::Curse, duration: Effect::Curse.duration(), tick: None };
    resolution.results.push(target.add_effect(Skill::Curse, curse));
    return resolution;;
}

fn drain(cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let drain = CrypEffect {
        effect: Effect::Drain,
        duration: Effect::Drain.duration(),
        tick: Some(Cast::new_tick(cryp, target, Skill::DrainTick)),
    };
    resolution.results.push(target.add_effect(Skill::Drain, drain));
    return resolution;;
}

fn drain_tick(cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let amount = cryp.spell_dmg();
    let drain_dmg = target.deal_spell_dmg(Skill::DrainTick, amount);
    resolution.results.push(drain_dmg.clone());

    match drain_dmg {
        ResolutionResult::Damage { amount, category: _, immunity } => {
            if !immunity.immune {
                resolution.results.push(cryp.heal(Skill::Heal, amount));
            }
        },
        _ => panic!("drain tick dmg not dealt {:?}", drain_dmg),
    }

    return resolution;
}

fn shield(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let shield = CrypEffect { effect: Effect::Shield, duration: Effect::Shield.duration(), tick: None };
    resolution.results.push(target.add_effect(Skill::Shield, shield));
    return resolution;
}

fn silence(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let silence = CrypEffect { effect: Effect::Silence, duration: Effect::Silence.duration(), tick: None };
    resolution.results.push(target.add_effect(Skill::Silence, silence));
    return resolution;
}

fn purge(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let immunity = target.immune(Skill::Purge);
    let immune = immunity.immune;

    if !immune {
        for (i, ce) in target.effects.clone().iter_mut().enumerate() {
            if ce.effect.category() == Category::SpellBuff {
                target.effects.remove(i);
                resolution.results.push(ResolutionResult::Removal { effect: ce.effect, immunity: immunity.clone() });
            }
        }
    }

    return resolution;
}

fn purify(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let immunity = target.immune(Skill::Purify);
    let immune = immunity.immune;

    if !immune {
        for (i, ce) in target.effects.clone().iter_mut().enumerate() {
            if ce.effect.category() == Category::SpellDebuff {
                target.effects.remove(i);
                resolution.results.push(ResolutionResult::Removal { effect: ce.effect, immunity: immunity.clone() });
            }
        }
    }

    return resolution;
}

fn banish(_cryp: &mut Cryp, target: &mut Cryp, mut resolution: Resolution) -> Resolution {
    let banish = CrypEffect { effect: Effect::Banish, duration: Effect::Banish.duration(), tick: None };
    resolution.results.push(target.add_effect(Skill::Banish, banish));
    return resolution;
}


#[cfg(test)]
mod tests {
    use skill::*;

    #[test]
    fn heal_test() {
        let mut x = Cryp::new()
            .named(&"muji".to_string())
            .level(8)
            .learn(Skill::Heal)
            .create();

        let mut y = Cryp::new()
            .named(&"camel".to_string())
            .level(8)
            .learn(Skill::Heal)
            .create();

        x.deal_phys_dmg(Skill::Attack, 5);

        heal(&mut y, &mut x, Resolution::new(Skill::Heal));
    }

    #[test]
    fn decay_test() {
        let mut x = Cryp::new()
            .named(&"muji".to_string())
            .level(8)
            .create();

        let mut y = Cryp::new()
            .named(&"camel".to_string())
            .level(8)
            .create();

        let mut log = vec![];
        decay(&mut x, &mut y, Resolution::new(Skill::Triage));

        assert!(y.effects.iter().any(|e| e.effect == Effect::Decay));

        y.reduce_effect_durations(&mut log);
        let _decay = y.effects.iter().find(|e| e.effect == Effect::Decay);
        // assert!(y.hp() == y.stamina().saturating_sub(decay.unwrap().tick.unwrap().amount));
    }

    #[test]
    fn block_test() {
        let mut x = Cryp::new()
            .named(&"muji".to_string())
            .level(8)
            .create();

        let mut y = Cryp::new()
            .named(&"camel".to_string())
            .level(8)
            .create();

        // ensure it doesn't have 0 pd
        x.phys_dmg.set(100);
        y.hp.set(500);

        block(&mut y.clone(), &mut y, Resolution::new(Skill::Block));
        assert!(y.effects.iter().any(|e| e.effect == Effect::Block));

        let res = attack(&mut x, &mut y, Resolution::new(Skill::Attack));

        match res.results[0] {
            ResolutionResult::Damage { amount, category: _, immunity: _ } => assert_eq!(amount, 50),
            _ => panic!("not damage"),
        };
    }

    #[test]
    fn triage_test() {
        let mut x = Cryp::new()
            .named(&"muji".to_string())
            .level(8)
            .create();

        let mut y = Cryp::new()
            .named(&"pretaliation".to_string())
            .level(8)
            .create();

        // ensure it doesn't have 0 sd
        x.spell_dmg.set(50);
        y.deal_phys_dmg(Skill::Attack, 5);
        let prev_hp = y.hp();

        let res = Resolution::new(Skill::Triage);

        triage(&mut x, &mut y, res);

        assert!(y.effects.iter().any(|e| e.effect == Effect::Triage));

        let res = Resolution::new(Skill::TriageTick);
        triage_tick(&mut x, &mut y, res);
        assert!(y.hp() > prev_hp);
    }

    #[test]
    fn silence_test() {
        let mut x = Cryp::new()
            .named(&"muji".to_string())
            .level(8)
            .create();

        silence(&mut x.clone(), &mut x, Resolution::new(Skill::Silence));
        assert!(x.effects.iter().any(|e| e.effect == Effect::Silence));
        assert!(x.disabled(Skill::Silence).disabled);
    }

    #[test]
    fn amplify_test() {
        let mut x = Cryp::new()
            .named(&"muji".to_string())
            .level(8)
            .create();

        x.spell_dmg.set(50);

        amplify(&mut x.clone(), &mut x, Resolution::new(Skill::Amplify));
        assert!(x.effects.iter().any(|e| e.effect == Effect::Amplify));
        assert_eq!(x.spell_dmg(), 100);
    }

    #[test]
    fn purify_test() {
        let mut x = Cryp::new()
            .named(&"muji".to_string())
            .level(8)
            .create();

        decay(&mut x.clone(), &mut x, Resolution::new(Skill::Decay));
        assert!(x.effects.iter().any(|e| e.effect == Effect::Decay));

        purify(&mut x.clone(), &mut x, Resolution::new(Skill::Purify));
        assert!(!x.effects.iter().any(|e| e.effect == Effect::Decay));
    }
}