use std::sync::{Arc, Weak};

use anyhow::Result;
use rpg_components::{
    components::{
        attributes::{Agility, Attributes, Intelligence, Strength},
        item_slots::ItemSlotContainer,
        level::Level,
        statistics::Statistics,
    },
    config::{attributes::AttributeSettings, items::ItemSettings},
};

use super::{CharacterWindow, Page};
use crate::*;

pub struct CharacterPage {
    engine: Arc<Engine>,
    hero: Entity,

    snippet: Arc<GuiSnippet>,
    grid: Arc<Grid>,
}

impl CharacterPage {
    pub fn new(
        engine: &Arc<Engine>,
        hero: Entity,
        hero_name: &str,
        reference: &Weak<CharacterWindow>,
    ) -> Result<Self> {
        let snippet = GuiSnippet::from_str(
            engine.gui_handler(),
            include_str!("../../resources/character/statistics.xml"),
        )?;

        let grid: Arc<Grid> = snippet.element("statistic_tab")?;

        let name: Arc<Label> = snippet.element("character_name")?;
        name.set_text(hero_name)?;

        let strength: Arc<Button> = snippet.element("strength_field")?;
        strength.set_callback({
            let update_stats = Self::create_update_stats(hero, engine, reference);

            move || {
                update_stats(|attributes| {
                    attributes.add_strength(Strength::from(1));
                })
            }
        });

        let agility: Arc<Button> = snippet.element("agility_field")?;
        agility.set_callback({
            let update_stats = Self::create_update_stats(hero, engine, reference);

            move || {
                update_stats(|attributes| {
                    attributes.add_agility(Agility::from(1));
                })
            }
        });

        let intelligence: Arc<Button> = snippet.element("intelligence_field")?;
        intelligence.set_callback({
            let update_stats = Self::create_update_stats(hero, engine, reference);

            move || {
                update_stats(|attributes| {
                    attributes.add_intelligence(Intelligence::from(1));
                })
            }
        });

        Ok(Self {
            engine: engine.clone(),
            hero,

            snippet,
            grid,
        })
    }

    fn refresh(&self) -> Result<()> {
        self.update_stats()?;
        self.update_attributes()?;

        Ok(())
    }

    fn update_stats(&self) -> Result<()> {
        let air_def: Arc<Label> = self.snippet.element("air_def_info")?;
        let fire_def: Arc<Label> = self.snippet.element("fire_def_info")?;
        let water_def: Arc<Label> = self.snippet.element("water_def_info")?;
        let armor: Arc<Label> = self.snippet.element("armor_info")?;

        let air_dmg: Arc<Label> = self.snippet.element("air_dmg_info")?;
        let fire_dmg: Arc<Label> = self.snippet.element("fire_dmg_info")?;
        let water_dmg: Arc<Label> = self.snippet.element("water_dmg_info")?;
        let phys_dmg: Arc<Label> = self.snippet.element("phys_dmg_info")?;

        let crit_chance: Arc<Label> = self.snippet.element("crit_chance_info")?;
        let crit_dmg: Arc<Label> = self.snippet.element("crit_dmg_info")?;

        let health: Arc<Label> = self.snippet.element("health_info")?;
        let health_regen: Arc<Label> = self.snippet.element("health_regen_info")?;
        let mana: Arc<Label> = self.snippet.element("mana_info")?;
        let mana_regen: Arc<Label> = self.snippet.element("mana_regen_info")?;

        self.engine.on_scene(|scene| {
            let entity = scene.entity(self.hero)?;
            let statistics = entity.get_component::<Statistics>()?;

            air_def.set_text(&format!("{}", statistics.air_resistance.raw()))?;
            fire_def.set_text(&format!("{}", statistics.fire_resistance.raw()))?;
            water_def.set_text(&format!("{}", statistics.water_resistance.raw()))?;
            armor.set_text(&format!("{}", statistics.armor.raw()))?;

            air_dmg.set_text(&format!("{}", statistics.air_damage.raw()))?;
            fire_dmg.set_text(&format!("{}", statistics.fire_damage.raw()))?;
            water_dmg.set_text(&format!("{}", statistics.water_damage.raw()))?;
            phys_dmg.set_text(&format!("{}", statistics.physical_damage.raw()))?;

            crit_chance.set_text(&format!("{:.2} %", statistics.critical_hit_chance.raw()))?;
            crit_dmg.set_text(&format!(
                "{:.2} %",
                statistics.critical_hit_damage.raw() + 100.0
            ))?;

            health.set_text(&format!("{:.0}", statistics.health.raw()))?;
            health_regen.set_text(&format!("{:.2}", statistics.health_regeneration.raw()))?;
            mana.set_text(&format!("{:.0}", statistics.mana.raw()))?;
            mana_regen.set_text(&format!("{:.2}", statistics.mana_regeneration.raw()))?;

            Ok(())
        })
    }

    fn update_attributes(&self) -> Result<()> {
        let level_label: Arc<Label> = self.snippet.element("level")?;
        let level_progress: Arc<ProgressBar> = self.snippet.element("level_progress")?;

        let attributes_label: Arc<Label> = self.snippet.element("attributes")?;
        let strength: Arc<Button> = self.snippet.element("strength_field")?;
        let agility: Arc<Button> = self.snippet.element("agility_field")?;
        let intelligence: Arc<Button> = self.snippet.element("intelligence_field")?;

        self.engine.on_scene(|scene| {
            let entity = scene.entity(self.hero)?;

            let level = entity.get_component::<Level>()?;
            let attributes = entity.get_component::<Attributes>()?;

            level_label.set_text(format!("Level: {}", level.level()))?;
            level_progress.set_text(format!(
                "{} / {}",
                level.current_experience, level.experience_needed
            ))?;

            attributes_label.set_text(format!(
                "Attributes ({})",
                Self::available_attribute_points(
                    &scene.resources.get::<AttributeSettings>(),
                    attributes,
                    level
                )
            ))?;

            strength.set_text(attributes.strength().raw())?;
            agility.set_text(attributes.agility().raw())?;
            intelligence.set_text(attributes.intelligence().raw())?;

            Ok(())
        })
    }

    fn available_attribute_points(
        settings: &AttributeSettings,
        attributes: &Attributes,
        level: &Level,
    ) -> u32 {
        let total_attribute_points = settings.meta_settings.starting_skill_points
            + level.level() * settings.meta_settings.skill_points_per_level
            + settings.starting_attributes.sum();

        let attributes_spent = attributes.sum();

        total_attribute_points - attributes_spent
    }

    fn create_update_stats<F>(
        hero: Entity,
        engine: &Arc<Engine>,
        reference: &Weak<CharacterWindow>,
    ) -> impl Fn(F) -> Result<()> + Clone
    where
        F: Fn(&mut Attributes),
    {
        let engine = engine.clone();
        let reference = reference.clone();

        move |upgrade: F| {
            let mut upgraded = false;

            engine.on_scene_mut(|scene| {
                let (resources, entity) = scene.entity_resource(hero)?;
                let mut multi_mut = entity.multi_mut();

                let attribute_settings = resources.get::<AttributeSettings>();
                let item_settings = resources.get::<ItemSettings>();

                let level = multi_mut.get::<Level>()?;
                let attributes = multi_mut.get::<Attributes>()?;

                if Self::available_attribute_points(attribute_settings, attributes, level) > 0 {
                    upgrade(attributes);

                    let statistics = multi_mut.get::<Statistics>()?;
                    let items = multi_mut.get::<ItemSlotContainer>()?;

                    statistics.update(attributes, attribute_settings, (&*items, item_settings));

                    upgraded = true;
                }

                Ok(())
            })?;

            if upgraded {
                if let Some(menu) = reference.upgrade() {
                    menu.tabs().character().refresh()?;
                }
            }

            Ok(())
        }
    }
}

impl Page for CharacterPage {
    fn enable(&mut self) -> Result<Arc<Grid>> {
        println!("enable CharacterPage");

        self.refresh()?;

        Ok(self.grid.clone())
    }

    fn disable(&mut self) -> Result<()> {
        Ok(())
    }

    fn select(&self) -> Result<()> {
        let strength: Arc<Button> = self.snippet.element("strength_field")?;
        strength.select()?;

        Ok(())
    }

    fn next_tab(&mut self) -> Result<()> {
        Ok(())
    }

    fn previous_tab(&mut self) -> Result<()> {
        Ok(())
    }

    fn event(&mut self, _button: ControllerButton) -> Result<bool> {
        Ok(false)
    }
}