mod appearance_settings_controls;

use std::any::TypeId;

use command_palette_hooks::CommandPaletteFilter;
use editor::EditorSettingsControls;
use feature_flags::{FeatureFlag, FeatureFlagViewExt};
use fs::Fs;
use gpui::{
    App, AsyncWindowContext, Entity, EventEmitter, FocusHandle, Focusable, Task, actions,
    impl_actions,
};
use schemars::JsonSchema;
use serde::Deserialize;
use settings::SettingsStore;
use ui::prelude::*;
use workspace::Workspace;
use workspace::item::{Item, ItemEvent};

use crate::appearance_settings_controls::AppearanceSettingsControls;

pub struct SettingsUiFeatureFlag;

impl FeatureFlag for SettingsUiFeatureFlag {
    const NAME: &'static str = "settings-ui";
}

#[derive(Copy, Clone, Debug, Default, PartialEq, Deserialize, JsonSchema)]
pub struct ImportVsCodeSettings {
    #[serde(default)]
    pub skip_prompt: bool,
}

impl_actions!(zed, [ImportVsCodeSettings]);
actions!(zed, [OpenSettingsEditor]);

pub fn init(cx: &mut App) {
    cx.observe_new(|workspace: &mut Workspace, window, cx| {
        let Some(window) = window else {
            return;
        };

        workspace.register_action(|workspace, _: &OpenSettingsEditor, window, cx| {
            let existing = workspace
                .active_pane()
                .read(cx)
                .items()
                .find_map(|item| item.downcast::<SettingsPage>());

            if let Some(existing) = existing {
                workspace.activate_item(&existing, true, true, window, cx);
            } else {
                let settings_page = SettingsPage::new(workspace, cx);
                workspace.add_item_to_active_pane(Box::new(settings_page), None, true, window, cx)
            }
        });

        workspace.register_action(|_workspace, action: &ImportVsCodeSettings, window, cx| {
            let fs = <dyn Fs>::global(cx);
            let action = *action;

            window
                .spawn(cx, async move |cx: &mut AsyncWindowContext| {
                    let vscode =
                        match settings::VsCodeSettings::load_user_settings(fs.clone()).await {
                            Ok(vscode) => vscode,
                            Err(err) => {
                                println!(
                                    "Failed to load VsCode settings: {}",
                                    err.context(format!(
                                        "Loading VsCode settings from path: {:?}",
                                        paths::vscode_settings_file()
                                    ))
                                );

                                let _ = cx.prompt(
                                    gpui::PromptLevel::Info,
                                    "Could not find or load a VsCode settings file",
                                    None,
                                    &["Ok"],
                                );
                                return;
                            }
                        };

                    let prompt = if action.skip_prompt {
                        Task::ready(Some(0))
                    } else {
                        let prompt = cx.prompt(
                            gpui::PromptLevel::Warning,
                            "Importing settings may overwrite your existing settings",
                            None,
                            &["Ok", "Cancel"],
                        );
                        cx.spawn(async move |_| prompt.await.ok())
                    };
                    if prompt.await != Some(0) {
                        return;
                    }

                    cx.update(|_, cx| {
                        cx.global::<SettingsStore>()
                            .import_vscode_settings(fs, vscode);
                        log::info!("Imported settings from VsCode");
                    })
                    .ok();
                })
                .detach();
        });

        let settings_ui_actions = [TypeId::of::<OpenSettingsEditor>()];

        CommandPaletteFilter::update_global(cx, |filter, _cx| {
            filter.hide_action_types(&settings_ui_actions);
        });

        cx.observe_flag::<SettingsUiFeatureFlag, _>(
            window,
            move |is_enabled, _workspace, _, cx| {
                if is_enabled {
                    CommandPaletteFilter::update_global(cx, |filter, _cx| {
                        filter.show_action_types(settings_ui_actions.iter());
                    });
                } else {
                    CommandPaletteFilter::update_global(cx, |filter, _cx| {
                        filter.hide_action_types(&settings_ui_actions);
                    });
                }
            },
        )
        .detach();
    })
    .detach();
}

pub struct SettingsPage {
    focus_handle: FocusHandle,
}

impl SettingsPage {
    pub fn new(_workspace: &Workspace, cx: &mut Context<Workspace>) -> Entity<Self> {
        cx.new(|cx| Self {
            focus_handle: cx.focus_handle(),
        })
    }
}

impl EventEmitter<ItemEvent> for SettingsPage {}

impl Focusable for SettingsPage {
    fn focus_handle(&self, _cx: &App) -> FocusHandle {
        self.focus_handle.clone()
    }
}

impl Item for SettingsPage {
    type Event = ItemEvent;

    fn tab_icon(&self, _window: &Window, _cx: &App) -> Option<Icon> {
        Some(Icon::new(IconName::Settings))
    }

    fn tab_content_text(&self, _window: &Window, _cx: &App) -> Option<SharedString> {
        Some("Settings".into())
    }

    fn show_toolbar(&self) -> bool {
        false
    }

    fn to_item_events(event: &Self::Event, mut f: impl FnMut(ItemEvent)) {
        f(*event)
    }
}

impl Render for SettingsPage {
    fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
        v_flex()
            .p_4()
            .size_full()
            .gap_4()
            .child(Label::new("Settings").size(LabelSize::Large))
            .child(
                v_flex().gap_1().child(Label::new("Appearance")).child(
                    v_flex()
                        .elevation_2(cx)
                        .child(AppearanceSettingsControls::new()),
                ),
            )
            .child(
                v_flex().gap_1().child(Label::new("Editor")).child(
                    v_flex()
                        .elevation_2(cx)
                        .child(EditorSettingsControls::new()),
                ),
            )
    }
}