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

use freya_engine::prelude::*;
use freya_native_core::{
    attributes::AttributeName,
    exports::shipyard::Component,
    node_ref::NodeView,
    prelude::{
        AttributeMaskBuilder,
        Dependancy,
        NodeMaskBuilder,
        State,
    },
    NodeId,
    SendAnyMap,
};
use freya_native_core_macro::partial_derive_state;
use torin::torin::Torin;

use crate::{
    CustomAttributeValues,
    ExtSplit,
    Parse,
    ParseAttribute,
    TextOverflow,
};

#[derive(Debug, Clone, PartialEq, Component)]
pub struct FontStyleState {
    pub color: Color,
    pub text_shadows: Vec<TextShadow>,
    pub font_family: Vec<String>,
    pub font_size: f32,
    pub font_slant: Slant,
    pub font_weight: Weight,
    pub font_width: Width,
    pub line_height: f32, // https://developer.mozilla.org/en-US/docs/Web/CSS/line-height,
    pub decoration: Decoration,
    pub word_spacing: f32,
    pub letter_spacing: f32,
    pub text_align: TextAlign,
    pub max_lines: Option<usize>,
    pub text_overflow: TextOverflow,
}

impl FontStyleState {
    pub fn text_style(&self, default_font_family: &[String], scale_factor: f32) -> TextStyle {
        let mut text_style = TextStyle::new();
        let mut font_family = self.font_family.clone();

        font_family.extend_from_slice(default_font_family);

        text_style
            .set_color(self.color)
            .set_font_style(FontStyle::new(
                self.font_weight,
                self.font_width,
                self.font_slant,
            ))
            .set_font_size(self.font_size * scale_factor)
            .set_font_families(&font_family)
            .set_word_spacing(self.word_spacing)
            .set_letter_spacing(self.letter_spacing)
            .set_height_override(true)
            .set_height(self.line_height);

        for text_shadow in self.text_shadows.iter() {
            text_style.add_shadow(*text_shadow);
        }

        text_style.set_decoration(&self.decoration);

        text_style
    }
}

impl Default for FontStyleState {
    fn default() -> Self {
        Self {
            color: Color::BLACK,
            text_shadows: Vec::new(),
            font_family: Vec::new(),
            font_size: 16.0,
            font_weight: Weight::NORMAL,
            font_slant: Slant::Upright,
            font_width: Width::NORMAL,
            line_height: 1.2,
            word_spacing: 0.0,
            letter_spacing: 0.0,
            decoration: Decoration {
                thickness_multiplier: 1.0, // Defaults to 0.0, even though 0.0 won't render anything
                ..Decoration::default()
            },
            text_align: TextAlign::default(),
            max_lines: None,
            text_overflow: TextOverflow::default(),
        }
    }
}

impl ParseAttribute for FontStyleState {
    fn parse_attribute(
        &mut self,
        attr: freya_native_core::prelude::OwnedAttributeView<CustomAttributeValues>,
    ) -> Result<(), crate::ParseError> {
        match attr.attribute {
            AttributeName::Color => {
                if let Some(value) = attr.value.as_text() {
                    // Make an exception for the "inherit" as in this case we don't want to pass
                    //  a color at all but use the inherited one.
                    if value != "inherit" {
                        self.color = Color::parse(value)?;
                    }
                }
            }
            AttributeName::TextShadow => {
                if let Some(value) = attr.value.as_text() {
                    self.text_shadows = value
                        .split_excluding_group(',', '(', ')')
                        .map(|chunk| TextShadow::parse(chunk).unwrap_or_default())
                        .collect();
                }
            }
            AttributeName::FontFamily => {
                if let Some(value) = attr.value.as_text() {
                    let families = value.split(',');
                    self.font_family = families
                        .into_iter()
                        .map(|f| f.trim().to_string())
                        .collect::<Vec<String>>();
                }
            }
            AttributeName::FontSize => {
                if let Some(value) = attr.value.as_text() {
                    if let Ok(font_size) = value.parse::<f32>() {
                        self.font_size = font_size;
                    }
                }
            }
            AttributeName::LineHeight => {
                if let Some(value) = attr.value.as_text() {
                    if let Ok(line_height) = value.parse() {
                        self.line_height = line_height;
                    }
                }
            }
            AttributeName::TextAlign => {
                if let Some(value) = attr.value.as_text() {
                    if let Ok(text_align) = TextAlign::parse(value) {
                        self.text_align = text_align;
                    }
                }
            }
            AttributeName::MaxLines => {
                if let Some(value) = attr.value.as_text() {
                    if let Ok(max_lines) = value.parse() {
                        self.max_lines = Some(max_lines);
                    }
                }
            }
            AttributeName::TextOverflow => {
                let value = attr.value.as_text();
                if let Some(value) = value {
                    if let Ok(text_overflow) = TextOverflow::parse(value) {
                        self.text_overflow = text_overflow;
                    }
                }
            }
            AttributeName::FontStyle => {
                if let Some(value) = attr.value.as_text() {
                    if let Ok(font_slant) = Slant::parse(value) {
                        self.font_slant = font_slant;
                    }
                }
            }
            AttributeName::FontWeight => {
                if let Some(value) = attr.value.as_text() {
                    if let Ok(font_weight) = Weight::parse(value) {
                        self.font_weight = font_weight;
                    }
                }
            }
            AttributeName::FontWidth => {
                if let Some(value) = attr.value.as_text() {
                    if let Ok(font_width) = Width::parse(value) {
                        self.font_width = font_width;
                    }
                }
            }
            AttributeName::Decoration => {
                if let Some(value) = attr.value.as_text() {
                    if let Ok(decoration) = TextDecoration::parse(value) {
                        self.decoration.ty = decoration;
                    }
                }
            }
            AttributeName::DecorationStyle => {
                if let Some(value) = attr.value.as_text() {
                    if let Ok(style) = TextDecorationStyle::parse(value) {
                        self.decoration.style = style;
                    }
                }
            }
            AttributeName::DecorationColor => {
                if let Some(value) = attr.value.as_text() {
                    if let Ok(new_decoration_color) = Color::parse(value) {
                        self.decoration.color = new_decoration_color;
                    }
                } else {
                    self.decoration.color = self.color;
                }
            }
            AttributeName::WordSpacing => {
                let value = attr.value.as_text();
                if let Some(value) = value {
                    if let Ok(word_spacing) = value.parse() {
                        self.word_spacing = word_spacing;
                    }
                }
            }
            AttributeName::LetterSpacing => {
                let value = attr.value.as_text();
                if let Some(value) = value {
                    if let Ok(letter_spacing) = value.parse() {
                        self.letter_spacing = letter_spacing;
                    }
                }
            }
            _ => {}
        }

        Ok(())
    }
}

#[partial_derive_state]
impl State<CustomAttributeValues> for FontStyleState {
    type ParentDependencies = (Self,);

    type ChildDependencies = ();

    type NodeDependencies = ();

    const NODE_MASK: NodeMaskBuilder<'static> =
        NodeMaskBuilder::new().with_attrs(AttributeMaskBuilder::Some(&[
            AttributeName::Color,
            AttributeName::TextAlign,
            AttributeName::TextShadow,
            AttributeName::FontSize,
            AttributeName::FontFamily,
            AttributeName::LineHeight,
            AttributeName::MaxLines,
            AttributeName::FontStyle,
            AttributeName::FontWeight,
            AttributeName::FontWidth,
            AttributeName::WordSpacing,
            AttributeName::LetterSpacing,
            AttributeName::Decoration,
            AttributeName::DecorationColor,
            AttributeName::DecorationStyle,
            AttributeName::TextOverflow,
        ]));

    fn update<'a>(
        &mut self,
        node_view: NodeView<CustomAttributeValues>,
        _node: <Self::NodeDependencies as Dependancy>::ElementBorrowed<'a>,
        parent: Option<<Self::ParentDependencies as Dependancy>::ElementBorrowed<'a>>,
        _children: Vec<<Self::ChildDependencies as Dependancy>::ElementBorrowed<'a>>,
        context: &SendAnyMap,
    ) -> bool {
        let torin_layout = context.get::<Arc<Mutex<Torin<NodeId>>>>().unwrap();

        let mut font_style = parent.map(|(v,)| v.clone()).unwrap_or_default();

        if let Some(attributes) = node_view.attributes() {
            for attr in attributes {
                font_style.parse_safe(attr);
            }
        }

        let changed_size = font_style != *self;

        if changed_size {
            torin_layout.lock().unwrap().invalidate(node_view.node_id());
        }

        let changed = &font_style != self;
        *self = font_style;
        changed
    }
}