# map.rs - source
Source of the Rust file `maplibre/src/map.rs`.

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    use std::rc::Rc;

    use thiserror::Error;

    use crate::{
        context::MapContext,
        coords::{LatLon, WorldCoords, Zoom},
        environment::Environment,
        kernel::Kernel,
        plugin::Plugin,
        render::{
            builder::{
                InitializationResult, InitializedRenderer, RendererBuilder, UninitializedRenderer,
            },
            error::RenderError,
            graph::RenderGraphError,
            view_state::ViewState,
        },
        schedule::{Schedule, Stage},
        style::Style,
        tcs::world::World,
        window::{HeadedMapWindow, MapWindow, MapWindowConfig},
    };

    #[derive(Error, Debug)]
    pub enum MapError {
        /// No need to set renderer again
        #[error("renderer was already set for this map")]
        RendererAlreadySet,
        #[error("renderer is not fully initialized")]
        RendererNotReady,
        #[error("initializing render graph failed")]
        RenderGraphInit(RenderGraphError),
        #[error("initializing device failed")]
        DeviceInit(RenderError),
    }

    pub enum CurrentMapContext {
        Ready(MapContext),
        Pending {
            style: Style,
            renderer_builder: RendererBuilder,
        },
    }

    pub struct Map<E: Environment> {
        kernel: Rc<Kernel<E>>,
        schedule: Schedule,
        map_context: CurrentMapContext,
        window: <E::MapWindowConfig as MapWindowConfig>::MapWindow,

        plugins: Vec<Box<dyn Plugin<E>>>,
    }

    impl<E: Environment> Map<E>
    where
        <<E as Environment>::MapWindowConfig as MapWindowConfig>::MapWindow: HeadedMapWindow,
    {
        pub fn new(
            style: Style,
            mut kernel: Kernel<E>,
            renderer_builder: RendererBuilder,
            plugins: Vec<Box<dyn Plugin<E>>>,
        ) -> Result<Self, MapError> {
            let schedule = Schedule::default();

            let window = kernel.map_window_config().create();

            let kernel = Rc::new(kernel);

            let map = Self {
                kernel,
                schedule,
                map_context: CurrentMapContext::Pending {
                    style,
                    renderer_builder,
                },
                window,
                plugins,
            };
            Ok(map)
        }

        pub async fn initialize_renderer(&mut self) -> Result<(), MapError> {
            match &mut self.map_context {
                CurrentMapContext::Ready(_) => Err(MapError::RendererAlreadySet),
                CurrentMapContext::Pending {
                    style,
                    renderer_builder,
                } => {
                    let init_result = renderer_builder
                        .clone() // Cloning because we want to be able to build multiple times maybe
                        .build()
                        .initialize_renderer::<E::MapWindowConfig>(&self.window)
                        .await
                        .map_err(MapError::DeviceInit)?;

                    let window_size = self.window.size();

                    let center = style.center.unwrap_or_default();
                    let initial_zoom = style.zoom.map(Zoom::new).unwrap_or_default();
                    let view_state = ViewState::new(
                        window_size,
                        WorldCoords::from_lat_lon(LatLon::new(center[0], center[1]), initial_zoom),
                        initial_zoom,
                        cgmath::Deg::<f64>(style.pitch.unwrap_or_default()),
                        cgmath::Rad(0.6435011087932844),
                    );

                    let mut world = World::default();

                    match init_result {
                        InitializationResult::Initialized(InitializedRenderer {
                            mut renderer, ..
                        }) => {
                            for plugin in &self.plugins {
                                plugin.build(
                                    &mut self.schedule,
                                    self.kernel.clone(),
                                    &mut world,
                                    &mut renderer.render_graph,
                                );
                            }

                            self.map_context = CurrentMapContext::Ready(MapContext {
                                world,
                                view_state,
                                style: std::mem::take(style),
                                renderer,
                            });
                        }
                        InitializationResult::Uninitialized(UninitializedRenderer { .. }) => {}
                        _ => panic!("Rendering context gone"),
                    };
                    Ok(())
                }
            }
        }

        pub fn window_mut(&mut self) -> &mut <E::MapWindowConfig as MapWindowConfig>::MapWindow {
            &mut self.window
        }
        pub fn window(&self) -> &<E::MapWindowConfig as MapWindowConfig>::MapWindow {
            &self.window
        }

        pub fn is_initialized(&self) -> bool {
            match &self.map_context {
                CurrentMapContext::Ready(_) => true,
                CurrentMapContext::Pending { .. } => false,
            }
        }

        /// Resets the complete state of this map - a new renderer and schedule needs to be created.
        /// The complete state of the app is reset.
        pub fn reset(&mut self) {
            self.schedule.clear();
            match &self.map_context {
                CurrentMapContext::Ready(c) => {
                    self.map_context = CurrentMapContext::Pending {
                        style: c.style.clone(),
                        renderer_builder: RendererBuilder::new()
                            .with_renderer_settings(c.renderer.settings.clone())
                            .with_wgpu_settings(c.renderer.wgpu_settings.clone()),
                    }
                }
                CurrentMapContext::Pending { .. } => {}
            }
        }

        #[tracing::instrument(name = "update_and_redraw", skip_all)]
        pub fn run_schedule(&mut self) -> Result<(), MapError> {
            match &mut self.map_context {
                CurrentMapContext::Ready(map_context) => {
                    self.schedule.run(map_context);
                    Ok(())
                }
                CurrentMapContext::Pending { .. } => Err(MapError::RendererNotReady),
            }
        }

        pub fn context(&self) -> Result<&MapContext, MapError> {
            match &self.map_context {
                CurrentMapContext::Ready(map_context) => Ok(map_context),
                CurrentMapContext::Pending { .. } => Err(MapError::RendererNotReady),
            }
        }

        pub fn context_mut(&mut self) -> Result<&mut MapContext, MapError> {
            match &mut self.map_context {
                CurrentMapContext::Ready(map_context) => Ok(map_context),
                CurrentMapContext::Pending { .. } => Err(MapError::RendererNotReady),
            }
        }

        pub fn kernel(&self) -> &Rc<Kernel<E>> {
            &self.kernel
        }
    }