swrs 0.1.1

use crate::color::Color;
use crate::parser::view::models::{AndroidView, image, layout, SpinnerMode, text};
use crate::parser::view::Layout;
use crate::parser::view::models::layout::Orientation;
use thiserror::Error;

/// A model that represents a single view
///
/// This struct contains fields that are common to all views, a field that holds an enum of every
/// (sketchware original) view types with its used fields (`view`) (if the view type isn't
/// recognized, it will be set as None) and another field that holds the raw view, just in case you
/// needed it.
#[derive(Debug, Clone, PartialEq)]
pub struct View {
    /// The id of this view, must be unique in the layout it belongs to; this is used to identify
    /// and find views in your java code
    pub id: String,

    /// The background color of this view
    pub background_color: Color,

    pub height: layout::Size,
    pub width: layout::Size,

    pub padding: SidesValue,
    pub margin: SidesValue,

    /// The weight of this view; Weight is a value that defines how much of the parent layout this
    /// view should occupy.
    ///
    /// For example, if a layout contains two views and both views has the weight of `1`, both views
    /// will get divided in half.
    pub weight: u32,

    /// The weight sum of this view; Weight sum is a value that defines the maximum sum of weight
    /// of all children of this layout.
    pub weight_sum: u32,

    /// The layout gravity of this view; Layout gravity is a value that defines the gravity of this
    /// view in the parent layout.
    pub layout_gravity: layout::gravity::Gravity,

    /// The view-type-specific fields are stored in this enum in this result.
    ///
    /// This is stored in a result type because it doesn't really matter in the tree parsing process
    ///
    /// Special note: the resulting reconstructed view's type field is dependent this field; unless
    /// it's an `Err`, in which case the type field on the raw field is used.
    pub view: Result<ViewType, ViewTypeConversionError>,

    /// The children of this view
    pub children: Vec<View>,

    /// The raw view of this View. This may be used to access every fields of this view in its raw
    /// form. Changes made on fields are then reflected on the view reconstruction result, except
    /// for fields that are already exposed on the API (such as a specific view type field, or stuff
    /// like padding and margin (stuff that are already exposed in this struct)).
    ///
    /// Special note for the type field: the resulting reconstructed view's type field is dependent
    /// on the view field of this struct; unless it's an `Err`, in which case the type field in here
    /// is used.
    pub raw: AndroidView,
}

impl View {
    pub fn find_id(&self, id: &str) -> Option<&View> {
        if self.id == id {
            Some(self)
        } else {
            // recurse on children
            self.children
                .iter()
                .find_map(|i| i.find_id(id))
        }
    }

    pub fn find_id_mut(&mut self, id: &str) -> Option<&mut View> {
        if self.id == id {
            Some(self)
        } else {
            // recurse on children
            self.children
                .iter_mut()
                .find_map(|i| i.find_id_mut(id))
        }
    }
}

impl From<AndroidView> for View {
    fn from(value: AndroidView) -> Self {
        View {
            id: value.id.clone(),
            background_color: value.layout.background_color,
            height: value.layout.height,
            width: value.layout.width,
            padding: SidesValue {
                top: value.layout.padding_top,
                right: value.layout.padding_right,
                bottom: value.layout.padding_bottom,
                left: value.layout.padding_left,
            },
            margin: SidesValue {
                top: value.layout.margin_top,
                right: value.layout.margin_right,
                bottom: value.layout.margin_bottom,
                left: value.layout.margin_left,
            },
            weight: value.layout.weight,
            weight_sum: value.layout.weight_sum,
            layout_gravity: value.layout.layout_gravity,
            view: ViewType::from_view(&value),
            children: vec![],
            raw: value,
        }
    }
}

/// A struct that stores 4 `u32` values (top, right, bottom, and left). Used as a model of
/// padding and margin
#[derive(Debug, Clone, PartialEq)]
pub struct SidesValue {
    pub top: u32,
    pub right: u32,
    pub bottom: u32,
    pub left: u32
}

/// An enum that contains every sketchware original view types and its necessary fields, any other
/// fields that aren't used in the specific view type will be neglected.
#[derive(Debug, Clone, Eq, PartialEq)]
pub enum ViewType {
    LinearLayout {
        orientation: layout::Orientation,
        gravity: layout::gravity::Gravity,
    },
    ScrollView {
        orientation: layout::Orientation,
        gravity: layout::gravity::Gravity,
    },
    Button {
        text: String,
        text_color: Color,
        text_size: u32,
        text_style: text::TextType,
    },
    TextView {
        text: String,
        text_color: Color,
        text_size: u32,
        single_line: bool,
        text_font: String,
        text_style: text::TextType,
        lines: u32,
    },
    EditText {
        text: String,
        text_color: Color,
        text_size: u32,
        single_line: bool,
        text_font: String,
        text_style: text::TextType,
        lines: u32,

        hint: String,
        hint_color: Color,
        ime_option: text::ImeOption,
        input_type: text::InputType,
    },
    ImageView {
        image_res_name: String,
        image_scale_type: image::ImageScaleType,
    },
    WebView,
    ProgressBar {
        max_progress: u32,
        progress: u32,
        indeterminate: bool,
        progress_style: String,
    },
    ListView {
        divider_height: u32,
        custom_view: String,
    },
    Spinner {
        spinner_mode: SpinnerMode,
    },
    CheckBox {
        checked: bool,

        text: String,
        text_color: Color,
        text_size: u32,
        text_font: String,
        text_style: text::TextType,
    },
    Switch {
        checked: bool,

        text: String,
        text_color: Color,
        text_size: u32,
        text_font: String,
        text_style: text::TextType,
    },
    SeekBar {
        max_progress: u32,
        progress: u32,
    },
    CalendarView {
        first_day_of_week: u8,
    },
    Fab {
        image_res_name: String,
    },
    AdView {
        adview_size: String,
    },
    MapView
}

impl ViewType {
    /// Converts an [`AndroidView`] into [`ViewType`]
    pub fn from_view(android_view: &AndroidView) -> Result<Self, ViewTypeConversionError> {
        // https://github.com/Iyxan23/sketchware-data/blob/main/data/view-types.md
        Ok(match android_view.r#type {
            0 => ViewType::LinearLayout {
                orientation: android_view.layout.orientation,
                gravity: android_view.layout.gravity,
            },
            2 => ViewType::ScrollView {
                orientation: Orientation::Horizontal,
                gravity: android_view.layout.gravity,
            },
            3 => ViewType::Button {
                text: android_view.text.text.clone(),
                text_color: android_view.text.text_color,
                text_size: android_view.text.text_size,
                text_style: android_view.text.text_type,
            },
            4 => ViewType::TextView {
                text: android_view.text.text.clone(),
                text_color: android_view.text.text_color,
                text_size: android_view.text.text_size,
                single_line: android_view.text.single_line,
                text_font: android_view.text.text_font.clone(),
                text_style: android_view.text.text_type,
                lines: android_view.text.line,
            },
            5 => ViewType::EditText {
                text: android_view.text.text.clone(),
                text_color: android_view.text.text_color,
                text_size: android_view.text.text_size,
                single_line: android_view.text.single_line,
                text_font: android_view.text.text_font.clone(),
                text_style: android_view.text.text_type,
                lines: android_view.text.line,
                hint: android_view.text.hint.clone(),
                hint_color: android_view.text.hint_color,
                ime_option: android_view.text.ime_option,
                input_type: android_view.text.input_type,
            },
            6 => ViewType::ImageView {
                image_res_name: android_view.image.res_name.as_ref()
                    .ok_or_else(||ViewTypeConversionError::ResNameNotPresent {
                        view_id: android_view.id.to_owned()
                    })?.clone(),
                image_scale_type: android_view.image.scale_type,
            },
            7 => ViewType::WebView,
            8 => ViewType::ProgressBar {
                max_progress: android_view.max,
                progress: android_view.progress,
                indeterminate: android_view.indeterminate,
                progress_style: android_view.progress_style.clone(),
            },
            9 => ViewType::ListView {
                divider_height: android_view.divider_height,
                custom_view: android_view.custom_view.clone(),
            },
            10 => ViewType::Spinner {
                spinner_mode: android_view.spinner_mode,
            },
            11 => ViewType::CheckBox {
                checked: android_view.checked,
                text: android_view.text.text.clone(),
                text_color: android_view.text.text_color,
                text_size: android_view.text.text_size,
                text_font: android_view.text.text_font.clone(),
                text_style: android_view.text.text_type,
            },
            12 => ViewType::ScrollView {
                orientation: Orientation::Vertical,
                gravity: android_view.layout.gravity,
            },
            13 => ViewType::Switch {
                checked: android_view.checked,
                text: android_view.text.text.clone(),
                text_color: android_view.text.text_color,
                text_size: android_view.text.text_size,
                text_font: android_view.text.text_font.clone(),
                text_style: android_view.text.text_type,
            },
            14 => ViewType::SeekBar {
                max_progress: android_view.max,
                progress: android_view.progress,
            },
            15 => ViewType::CalendarView { first_day_of_week: android_view.first_day_of_week },
            16 => ViewType::Fab {
                image_res_name: android_view.image.res_name.as_ref()
                    .ok_or_else(||ViewTypeConversionError::ResNameNotPresent {
                        view_id: android_view.id.to_owned(),
                    })?.clone(),
            },
            17 => ViewType::AdView { adview_size: android_view.ad_size.clone() },
            18 => ViewType::MapView,
            _ => Err(ViewTypeConversionError::UnknownViewType {
                view_type: android_view.r#type,
                view_id: android_view.id.to_owned()
            })?
        })
    }

    /// Gets the type id of this view
    pub fn get_type_id(&self) -> u8 {
        match self {
            ViewType::LinearLayout { .. }   => 0,
            ViewType::ScrollView { .. }     => 2,
            ViewType::Button { .. }         => 3,
            ViewType::TextView { .. }       => 4,
            ViewType::EditText { .. }       => 5,
            ViewType::ImageView { .. }      => 6,
            ViewType::WebView               => 7,
            ViewType::ProgressBar { .. }    => 8,
            ViewType::ListView { .. }       => 9,
            ViewType::Spinner { .. }        => 10,
            ViewType::CheckBox { .. }       => 11,
            ViewType::Switch { .. }         => 12,
            ViewType::SeekBar { .. }        => 13,
            ViewType::CalendarView { .. }   => 14,
            ViewType::Fab { .. }            => 15,
            ViewType::AdView { .. }         => 16,
            ViewType::MapView               => 17,
        }
    }

    /// Applies the specific values of a ViewType to the given view
    pub fn apply_values_to_view(self, view: &mut AndroidView) {
        match self {
            ViewType::LinearLayout { orientation, gravity } => {
                view.layout.orientation = orientation;
                view.layout.gravity = gravity;
            }

            ViewType::ScrollView { orientation, gravity } => {
                view.layout.orientation = orientation;
                view.layout.gravity = gravity;
            }

            ViewType::Button { text, text_color, text_size, text_style } => {
                view.text.text = text;
                view.text.text_color = text_color;
                view.text.text_size = text_size;
                view.text.text_type = text_style;
            }

            ViewType::TextView {
                text, text_color, text_size, single_line,
                text_font, text_style, lines
            } => {
                view.text.text = text;
                view.text.text_color = text_color;
                view.text.text_size = text_size;
                view.text.single_line = single_line;
                view.text.text_font = text_font;
                view.text.text_type = text_style;
                view.text.line = lines;
            }

            ViewType::EditText {
                text, text_color, text_size, single_line, text_font,
                text_style, lines, hint, hint_color, ime_option,
                input_type
            } => {
                view.text.text = text;
                view.text.text_color = text_color;
                view.text.text_size = text_size;
                view.text.single_line = single_line;
                view.text.text_font = text_font;
                view.text.text_type = text_style;
                view.text.line = lines;
                view.text.hint = hint;
                view.text.hint_color = hint_color;
                view.text.ime_option = ime_option;
                view.text.input_type = input_type;
            }

            ViewType::ImageView { image_res_name, image_scale_type } => {
                view.image.res_name = Some(image_res_name);
                view.image.scale_type = image_scale_type;
            }

            ViewType::WebView => {}
            ViewType::ProgressBar {
                max_progress, progress, indeterminate, progress_style
            } => {
                view.max = max_progress;
                view.progress = progress;
                view.indeterminate = indeterminate;
                view.progress_style = progress_style;
            }

            ViewType::ListView { divider_height, custom_view } => {
                view.divider_height = divider_height;
                view.custom_view = custom_view;
            }

            ViewType::Spinner { spinner_mode } => { view.spinner_mode = spinner_mode; }

            ViewType::CheckBox {
                checked, text, text_color, text_size, text_font,
                text_style
            } => {
                view.checked = checked;
                view.text.text = text;
                view.text.text_color = text_color;
                view.text.text_size = text_size;
                view.text.text_font = text_font;
                view.text.text_type = text_style;
            }

            ViewType::Switch {
                checked, text, text_color, text_size, text_font,
                text_style
            } => {
                view.checked = checked;
                view.text.text = text;
                view.text.text_color = text_color;
                view.text.text_size = text_size;
                view.text.text_font = text_font;
                view.text.text_type = text_style;
            }

            ViewType::SeekBar { max_progress, progress } => {
                view.max = max_progress;
                view.progress = progress;
            }

            ViewType::CalendarView { first_day_of_week } => {
                view.first_day_of_week = first_day_of_week;
            }

            ViewType::Fab { image_res_name } => { view.image.res_name = Some(image_res_name); }
            ViewType::AdView { adview_size } => { view.ad_size = adview_size; }
            ViewType::MapView => {}
        }
    }
}

#[derive(Error, Debug, Clone, PartialEq)]
pub enum ViewTypeConversionError {
    #[error("unknown view type `{view_type}` on view with id `{view_id}`")]
    UnknownViewType {
        view_type: u8,
        view_id: String,
    },
    #[error("the field res_name on view with id `{view_id}` is not present when needed as this view is either a FAB or an ImageView")]
    ResNameNotPresent {
        view_id: String,
    }
}

/// Converts a parser's raw [`Layout`] into a tree of views, the returned vector of views is the
/// children of the root view.
///
/// You might expect this function to return a single view because a layout only has one single
/// root view, but no, sketchware hardcodes the root view and it only stores its children.
pub fn parse_raw_layout(screen_view: Layout) -> Result<Vec<View>, ParseLayoutError> {
    let mut result = Vec::<View>::new();

    for view in screen_view.0 {
        let parent_id =
            view.parent.as_ref().ok_or_else(||ParseLayoutError::NoParentField {
                view_id: view.id.to_owned()
            })?;

        if parent_id == "root" {
            result.push(view.into());
        } else {
            let parent = result.iter_mut().find_map(|i|i.find_id_mut(&parent_id))
                .ok_or_else(||ParseLayoutError::NonexistentParent {
                    view_id: view.id.to_owned(),
                    parent_id: parent_id.to_owned()
                })?;

            parent.children.push(view.into());
        }
    }

    Ok(result)
}

#[derive(Error, Debug)]
pub enum ParseLayoutError {
    #[error("view with id {view_id} doesn't have a parent field")]
    NoParentField {
        view_id: String
    },
    #[error("couldn't find parent of view with id `{view_id}` (parent id: `{parent_id}`)")]
    NonexistentParent {
        view_id: String,
        parent_id: String
    }
}

/// Flattens a list of API [`View`] models into a single list of parser models
pub fn flatten_views(views: Vec<View>, parent_id: Option<String>, parent_type: Option<u8>) -> Vec<AndroidView> {
    // default parent is the root view
    let parent_id = parent_id.unwrap_or_else(|| "root".to_string());
    let parent_type = parent_type.unwrap_or_else(|| 0);

    let mut result = Vec::<AndroidView>::new();
    let mut children_result = Vec::<AndroidView>::new();

    for view in views {
        // get the raw view old
        let mut result_view = view.raw;

        // set our id, type and parent just to make sure those cheeky hackers tries to change it
        result_view.id = view.id.to_owned();
        result_view.parent = Some(parent_id.clone());
        result_view.parent_type = parent_type as i8;

        // Gets the type id from the view type that is in the `view` field. If it's an Err, will
        // fallback to the type field from the raw view.
        //
        // also overwrite values from the view-specific fields to the raw view
        let view_type_id = if let Ok(view_type) = view.view {
            // set the type id to the one from view
            let type_id = view_type.get_type_id();

            view_type.apply_values_to_view(&mut result_view);

            type_id
        } else {
            // use the one in the raw view
            result_view.r#type
        };

        // and then just map the variables
        result_view.layout.height = view.height;
        result_view.layout.width = view.width;

        result_view.layout.padding_bottom = view.padding.bottom;
        result_view.layout.padding_left = view.padding.left;
        result_view.layout.padding_right = view.padding.right;
        result_view.layout.padding_top = view.padding.top;

        result_view.layout.margin_bottom = view.margin.bottom;
        result_view.layout.margin_left = view.margin.left;
        result_view.layout.margin_right = view.margin.right;
        result_view.layout.margin_top = view.margin.top;

        result_view.layout.background_color = view.background_color;
        result_view.layout.layout_gravity = view.layout_gravity;
        result_view.layout.weight = view.weight;
        result_view.layout.weight_sum = view.weight_sum;

        // done, push it to the result
        result.push(result_view);

        // and also recursively flatten the children if there is any
        if !view.children.is_empty() {
            children_result.append(
                &mut flatten_views(
                    view.children,
                    Some(view.id),
                    Some(view_type_id)
                )
            )
        }
    }

    // finally add the children views into the final result
    result.append(&mut children_result);

    result
}