//! Rerun Viewer GUI.
//!
//! This crate contains all the GUI code for the Rerun Viewer,
//! including all 2D and 3D visualization code.

// TODO(#6330): remove unwrap()
#![allow(clippy::unwrap_used)]

mod app;
mod app_blueprint;
mod app_state;
mod background_tasks;
pub mod env_vars;
mod saving;
mod screenshotter;
mod ui;
mod viewer_analytics;

#[cfg(not(target_arch = "wasm32"))]
mod loading;

/// Auto-generated blueprint-related types.
///
/// They all implement the [`re_types_core::Component`] trait.
///
/// Unstable. Used for the ongoing blueprint experimentations.
pub mod blueprint;

pub(crate) use {app_state::AppState, ui::memory_panel};

pub use app::{App, StartupOptions};

pub use re_capabilities::MainThreadToken;

pub mod external {
    pub use {eframe, egui};
    pub use {
        re_chunk, re_chunk::external::*, re_chunk_store, re_chunk_store::external::*, re_data_ui,
        re_entity_db, re_log, re_log_types, re_memory, re_renderer, re_types, re_ui,
        re_viewer_context, re_viewer_context::external::*, re_viewport, re_viewport::external::*,
    };
}

// ----------------------------------------------------------------------------
// When compiling for native:

#[cfg(not(target_arch = "wasm32"))]
pub mod native;
#[cfg(not(target_arch = "wasm32"))]
pub use native::{run_native_app, run_native_viewer_with_messages};

// ----------------------------------------------------------------------------
// When compiling for web:

#[cfg(target_arch = "wasm32")]
mod web;

#[cfg(target_arch = "wasm32")]
mod web_tools;

#[cfg(target_arch = "wasm32")]
mod history;

// ---------------------------------------------------------------------------

/// Information about this version of the crate.
pub fn build_info() -> re_build_info::BuildInfo {
    re_build_info::build_info!()
}

// ---------------------------------------------------------------------------

/// Where is this App running in?
/// Used for analytics.
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum AppEnvironment {
    /// Created from the Rerun C SDK.
    CSdk,

    /// Created from the Rerun Python SDK.
    PythonSdk(re_log_types::PythonVersion),

    /// Created from the Rerun Rust SDK.
    RustSdk {
        rustc_version: String,
        llvm_version: String,
    },

    /// Running the Rust `rerun` binary from the CLI.
    RerunCli {
        rustc_version: String,
        llvm_version: String,
    },

    /// We are a web-viewer running in a browser as Wasm.
    Web { url: String },

    /// Some custom application wrapping `re_viewer`.
    Custom(String),
}

impl AppEnvironment {
    pub fn from_store_source(source: &re_log_types::StoreSource) -> Self {
        use re_log_types::StoreSource;
        match source {
            StoreSource::CSdk => Self::CSdk,

            StoreSource::PythonSdk(python_version) => Self::PythonSdk(python_version.clone()),

            StoreSource::RustSdk {
                rustc_version,
                llvm_version,
            } => Self::RustSdk {
                rustc_version: rustc_version.clone(),
                llvm_version: llvm_version.clone(),
            },

            StoreSource::File { .. }
            | StoreSource::Unknown
            | StoreSource::Viewer
            | StoreSource::Other(_) => {
                // We should not really get here

                #[cfg(debug_assertions)]
                re_log::warn_once!("Asked to create an AppEnvironment from {source:?}");

                Self::RustSdk {
                    rustc_version: "unknown".into(),
                    llvm_version: "unknown".into(),
                }
            }
        }
    }

    pub fn name(&self) -> &'static str {
        match self {
            Self::CSdk => "c_sdk",
            Self::PythonSdk(_) => "python_sdk",
            Self::RustSdk { .. } => "rust_sdk",
            Self::RerunCli { .. } => "rerun_cli",
            Self::Web { .. } => "web_viewer",
            Self::Custom(_) => "custom",
        }
    }

    pub fn url(&self) -> Option<&String> {
        match self {
            Self::Web { url } => Some(url),
            _ => None,
        }
    }
}

// ---------------------------------------------------------------------------

fn supported_graphics_backends(force_wgpu_backend: Option<String>) -> wgpu::Backends {
    if let Some(force_wgpu_backend) = force_wgpu_backend {
        if let Some(backend) = re_renderer::config::parse_graphics_backend(&force_wgpu_backend) {
            if let Err(err) = re_renderer::config::validate_graphics_backend_applicability(backend)
            {
                re_log::error!("Failed to force rendering backend parsed from {force_wgpu_backend:?}: {err}\nUsing default backend instead.");
                re_renderer::config::supported_backends()
            } else {
                re_log::info!("Forcing graphics backend to {backend:?}.");
                backend.into()
            }
        } else {
            re_log::error!("Failed to parse rendering backend string {force_wgpu_backend:?}. Using default backend instead.");
            re_renderer::config::supported_backends()
        }
    } else {
        re_renderer::config::supported_backends()
    }
}

pub(crate) fn wgpu_options(force_wgpu_backend: Option<String>) -> egui_wgpu::WgpuConfiguration {
    re_tracing::profile_function!();

    egui_wgpu::WgpuConfiguration {
            // When running wgpu on native debug builds, we want some extra control over how
            // and when a poisoned surface gets recreated.
            #[cfg(all(not(target_arch = "wasm32"), debug_assertions))] // native debug build
            on_surface_error: std::sync::Arc::new(|err| {
                // On windows, this error also occurs when the app is minimized.
                // Silently return here to prevent spamming the console with:
                // "The underlying surface has changed, and therefore the swap chain
                //  must be updated"
                if err == wgpu::SurfaceError::Outdated && !cfg!(target_os = "windows"){
                    // We haven't been able to present anything to the swapchain for
                    // a while, because the pipeline is poisoned.
                    // Recreate a sane surface to restart the cycle and see if the
                    // user has fixed the issue.
                    egui_wgpu::SurfaceErrorAction::RecreateSurface
                } else {
                    egui_wgpu::SurfaceErrorAction::SkipFrame
                }
            }),
            // TODO(#8475): It would be great to use `egui_wgpu::WgpuSetup::Existing` and put the
            // full control of adapter creation into the hands of `re_renderer`.
            // However, we generally need to take into account the _surface_ as well:
            // * this is a strict *requirement* when using WebGL
            // * on OpenGL & Linux it _helps_ to know the surface because either Vulkan or OpenGL may not be happy with all surfaces
            //
            // Next better thing that we should aspire for is to allow rejecting adapters on native in egui.
            // I.e. instead of always providing a device descriptor, we should allow it to fail for a given device.
            // This rejection should happen with reason-message so it's tractable why a given adapter wasn't chosen.
            // Which is obviously what we want to show when we're rejecting all adapters, but it would
            // also be great to be able to show that information later on.
            wgpu_setup: egui_wgpu::WgpuSetup::CreateNew {
                device_descriptor: std::sync::Arc::new(|adapter| re_renderer::config::DeviceCaps::from_adapter_without_validation(adapter).device_descriptor()),
                supported_backends: supported_graphics_backends(force_wgpu_backend),
                power_preference: wgpu::util::power_preference_from_env().unwrap_or(wgpu::PowerPreference::HighPerformance),
             },
            ..Default::default()
        }
}

/// Customize eframe and egui to suit the rerun viewer.
pub fn customize_eframe_and_setup_renderer(
    cc: &eframe::CreationContext<'_>,
) -> Result<(), re_renderer::RenderContextError> {
    re_tracing::profile_function!();

    if let Some(render_state) = &cc.wgpu_render_state {
        use re_renderer::RenderContext;

        let paint_callback_resources = &mut render_state.renderer.write().callback_resources;

        let render_ctx = RenderContext::new(
            &render_state.adapter,
            render_state.device.clone(),
            render_state.queue.clone(),
            render_state.target_format,
        )?;

        paint_callback_resources.insert(render_ctx);
    }

    re_ui::apply_style_and_install_loaders(&cc.egui_ctx);
    Ok(())
}

// ---------------------------------------------------------------------------

/// This wakes up the ui thread each time we receive a new message.
#[cfg(not(target_arch = "wasm32"))]
pub fn wake_up_ui_thread_on_each_msg<T: Send + 'static>(
    rx: re_smart_channel::Receiver<T>,
    ctx: egui::Context,
) -> re_smart_channel::Receiver<T> {
    // We need to intercept messages to wake up the ui thread.
    // For that, we need a new channel.
    // However, we want to make sure the channel latency numbers are from the start
    // of the first channel, to the end of the second.
    // For that we need to use `chained_channel`, `recv_with_send_time` and `send_at`.
    let (tx, new_rx) = rx.chained_channel();
    std::thread::Builder::new()
        .name("ui_waker".to_owned())
        .spawn(move || {
            while let Ok(msg) = rx.recv_with_send_time() {
                if tx.send_at(msg.time, msg.source, msg.payload).is_ok() {
                    ctx.request_repaint();
                } else {
                    break;
                }
            }
            re_log::trace!("Shutting down ui_waker thread");
        })
        .unwrap();
    new_rx
}

/// Reset the viewer state as stored on disk and local storage,
/// keeping only the analytics state.
#[allow(clippy::unnecessary_wraps)] // wasm only
pub fn reset_viewer_persistence() -> anyhow::Result<()> {
    #[cfg(not(target_arch = "wasm32"))]
    {
        let Some(data_dir) = eframe::storage_dir(native::APP_ID) else {
            anyhow::bail!("Failed to figure out where Rerun stores its data.")
        };

        // Note: `remove_dir_all` fails if the directory doesn't exist.
        if data_dir.exists() {
            // Keep analytics, because it is used to uniquely identify users over time.
            let analytics_file_path = data_dir.join("analytics.json");
            let analytics = std::fs::read(&analytics_file_path);

            if let Err(err) = std::fs::remove_dir_all(&data_dir) {
                anyhow::bail!("Failed to remove {data_dir:?}: {err}");
            } else {
                re_log::info!("Cleared {data_dir:?}.");
            }

            if let Ok(analytics) = analytics {
                // Restore analytics.json:
                std::fs::create_dir(&data_dir).ok();
                std::fs::write(&analytics_file_path, analytics).ok();
            }
        } else {
            re_log::info!("Rerun state was already cleared.");
        }

        // Clear the default cache directory if it exists
        //TODO(#8064): should clear the _actual_ cache directory, not the default one
        if let Some(cache_dir) = re_viewer_context::AppOptions::default_cache_directory() {
            if let Err(err) = std::fs::remove_dir_all(&cache_dir) {
                if err.kind() != std::io::ErrorKind::NotFound {
                    anyhow::bail!("Failed to remove {cache_dir:?}: {err}");
                }
            } else {
                re_log::info!("Cleared {cache_dir:?}.");
            }
        }
    }
    #[cfg(target_arch = "wasm32")]
    {
        // TODO(emilk): eframe should have an API for this.
        if let Some(storage) = web_sys::window()
            .and_then(|w| w.local_storage().ok())
            .flatten()
        {
            storage.delete("egui_memory_ron").ok();
            storage.delete(eframe::APP_KEY).ok();
        }

        // TODO(#2579): implement web-storage for blueprints as well, and clear it here
    }

    Ok(())
}