use gpui::App;
use language::CursorShape;
use schemars::JsonSchema;
use serde::{Deserialize, Serialize};
use settings::{Settings, SettingsSources};

#[derive(Deserialize, Clone)]
pub struct EditorSettings {
    pub cursor_blink: bool,
    pub cursor_shape: Option<CursorShape>,
    pub current_line_highlight: CurrentLineHighlight,
    pub lsp_highlight_debounce: u64,
    pub hover_popover_enabled: bool,
    pub hover_popover_delay: u64,
    pub toolbar: Toolbar,
    pub scrollbar: Scrollbar,
    pub gutter: Gutter,
    pub scroll_beyond_last_line: ScrollBeyondLastLine,
    pub vertical_scroll_margin: f32,
    pub autoscroll_on_clicks: bool,
    pub horizontal_scroll_margin: f32,
    pub scroll_sensitivity: f32,
    pub relative_line_numbers: bool,
    pub seed_search_query_from_cursor: SeedQuerySetting,
    pub use_smartcase_search: bool,
    pub multi_cursor_modifier: MultiCursorModifier,
    pub redact_private_values: bool,
    pub expand_excerpt_lines: u32,
    pub middle_click_paste: bool,
    #[serde(default)]
    pub double_click_in_multibuffer: DoubleClickInMultibuffer,
    pub search_wrap: bool,
    #[serde(default)]
    pub search: SearchSettings,
    pub auto_signature_help: bool,
    pub show_signature_help_after_edits: bool,
    pub jupyter: Jupyter,
    pub show_inline_completions_in_menu: bool,
}

#[derive(Copy, Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
#[serde(rename_all = "snake_case")]
pub enum CurrentLineHighlight {
    // Don't highlight the current line.
    None,
    // Highlight the gutter area.
    Gutter,
    // Highlight the editor area.
    Line,
    // Highlight the full line.
    All,
}

/// When to populate a new search's query based on the text under the cursor.
#[derive(Copy, Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
#[serde(rename_all = "snake_case")]
pub enum SeedQuerySetting {
    /// Always populate the search query with the word under the cursor.
    Always,
    /// Only populate the search query when there is text selected.
    Selection,
    /// Never populate the search query
    Never,
}

/// What to do when multibuffer is double clicked in some of its excerpts (parts of singleton buffers).
#[derive(Default, Copy, Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
#[serde(rename_all = "snake_case")]
pub enum DoubleClickInMultibuffer {
    /// Behave as a regular buffer and select the whole word.
    #[default]
    Select,
    /// Open the excerpt clicked as a new buffer in the new tab, if no `alt` modifier was pressed during double click.
    /// Otherwise, behave as a regular buffer and select the whole word.
    Open,
}

#[derive(Debug, Clone, Deserialize)]
pub struct Jupyter {
    /// Whether the Jupyter feature is enabled.
    ///
    /// Default: true
    pub enabled: bool,
}

#[derive(Default, Copy, Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
#[serde(rename_all = "snake_case")]
pub struct JupyterContent {
    /// Whether the Jupyter feature is enabled.
    ///
    /// Default: true
    pub enabled: Option<bool>,
}

#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
pub struct Toolbar {
    pub breadcrumbs: bool,
    pub quick_actions: bool,
    pub selections_menu: bool,
}

#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
pub struct Scrollbar {
    pub show: ShowScrollbar,
    pub git_diff: bool,
    pub selected_symbol: bool,
    pub search_results: bool,
    pub diagnostics: ScrollbarDiagnostics,
    pub cursors: bool,
    pub axes: ScrollbarAxes,
}

#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
pub struct Gutter {
    pub line_numbers: bool,
    pub code_actions: bool,
    pub runnables: bool,
    pub folds: bool,
}

/// When to show the scrollbar in the editor.
///
/// Default: auto
#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
#[serde(rename_all = "snake_case")]
pub enum ShowScrollbar {
    /// Show the scrollbar if there's important information or
    /// follow the system's configured behavior.
    Auto,
    /// Match the system's configured behavior.
    System,
    /// Always show the scrollbar.
    Always,
    /// Never show the scrollbar.
    Never,
}

/// Forcefully enable or disable the scrollbar for each axis
#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
#[serde(rename_all = "lowercase")]
pub struct ScrollbarAxes {
    /// When false, forcefully disables the horizontal scrollbar. Otherwise, obey other settings.
    ///
    /// Default: true
    pub horizontal: bool,

    /// When false, forcefully disables the vertical scrollbar. Otherwise, obey other settings.
    ///
    /// Default: true
    pub vertical: bool,
}

/// Which diagnostic indicators to show in the scrollbar.
///
/// Default: all
#[derive(Copy, Clone, Debug, Serialize, JsonSchema, PartialEq, Eq)]
#[serde(rename_all = "lowercase")]
pub enum ScrollbarDiagnostics {
    /// Show all diagnostic levels: hint, information, warnings, error.
    All,
    /// Show only the following diagnostic levels: information, warning, error.
    Information,
    /// Show only the following diagnostic levels: warning, error.
    Warning,
    /// Show only the following diagnostic level: error.
    Error,
    /// Do not show diagnostics.
    None,
}

impl<'de> Deserialize<'de> for ScrollbarDiagnostics {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        struct Visitor;

        impl<'de> serde::de::Visitor<'de> for Visitor {
            type Value = ScrollbarDiagnostics;

            fn expecting(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
                write!(
                    f,
                    r#"a boolean or one of "all", "information", "warning", "error", "none""#
                )
            }

            fn visit_bool<E>(self, b: bool) -> Result<Self::Value, E>
            where
                E: serde::de::Error,
            {
                match b {
                    false => Ok(ScrollbarDiagnostics::None),
                    true => Ok(ScrollbarDiagnostics::All),
                }
            }

            fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
            where
                E: serde::de::Error,
            {
                match s {
                    "all" => Ok(ScrollbarDiagnostics::All),
                    "information" => Ok(ScrollbarDiagnostics::Information),
                    "warning" => Ok(ScrollbarDiagnostics::Warning),
                    "error" => Ok(ScrollbarDiagnostics::Error),
                    "none" => Ok(ScrollbarDiagnostics::None),
                    _ => Err(E::unknown_variant(
                        s,
                        &["all", "information", "warning", "error", "none"],
                    )),
                }
            }
        }

        deserializer.deserialize_any(Visitor)
    }
}

/// The key to use for adding multiple cursors
///
/// Default: alt
#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
#[serde(rename_all = "snake_case")]
pub enum MultiCursorModifier {
    Alt,
    #[serde(alias = "cmd", alias = "ctrl")]
    CmdOrCtrl,
}

/// Whether the editor will scroll beyond the last line.
///
/// Default: one_page
#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
#[serde(rename_all = "snake_case")]
pub enum ScrollBeyondLastLine {
    /// The editor will not scroll beyond the last line.
    Off,

    /// The editor will scroll beyond the last line by one page.
    OnePage,

    /// The editor will scroll beyond the last line by the same number of lines as vertical_scroll_margin.
    VerticalScrollMargin,
}

/// Default options for buffer and project search items.
#[derive(Copy, Clone, Default, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
pub struct SearchSettings {
    #[serde(default)]
    pub whole_word: bool,
    #[serde(default)]
    pub case_sensitive: bool,
    #[serde(default)]
    pub include_ignored: bool,
    #[serde(default)]
    pub regex: bool,
}

#[derive(Clone, Default, Serialize, Deserialize, JsonSchema)]
pub struct EditorSettingsContent {
    /// Whether the cursor blinks in the editor.
    ///
    /// Default: true
    pub cursor_blink: Option<bool>,
    /// Cursor shape for the default editor.
    /// Can be "bar", "block", "underline", or "hollow".
    ///
    /// Default: None
    pub cursor_shape: Option<CursorShape>,
    /// How to highlight the current line in the editor.
    ///
    /// Default: all
    pub current_line_highlight: Option<CurrentLineHighlight>,
    /// The debounce delay before querying highlights from the language
    /// server based on the current cursor location.
    ///
    /// Default: 75
    pub lsp_highlight_debounce: Option<u64>,
    /// Whether to show the informational hover box when moving the mouse
    /// over symbols in the editor.
    ///
    /// Default: true
    pub hover_popover_enabled: Option<bool>,
    /// Time to wait before showing the informational hover box
    ///
    /// Default: 350
    pub hover_popover_delay: Option<u64>,
    /// Toolbar related settings
    pub toolbar: Option<ToolbarContent>,
    /// Scrollbar related settings
    pub scrollbar: Option<ScrollbarContent>,
    /// Gutter related settings
    pub gutter: Option<GutterContent>,
    /// Whether the editor will scroll beyond the last line.
    ///
    /// Default: one_page
    pub scroll_beyond_last_line: Option<ScrollBeyondLastLine>,
    /// The number of lines to keep above/below the cursor when auto-scrolling.
    ///
    /// Default: 3.
    pub vertical_scroll_margin: Option<f32>,
    /// Whether to scroll when clicking near the edge of the visible text area.
    ///
    /// Default: false
    pub autoscroll_on_clicks: Option<bool>,
    /// The number of characters to keep on either side when scrolling with the mouse.
    ///
    /// Default: 5.
    pub horizontal_scroll_margin: Option<f32>,
    /// Scroll sensitivity multiplier. This multiplier is applied
    /// to both the horizontal and vertical delta values while scrolling.
    ///
    /// Default: 1.0
    pub scroll_sensitivity: Option<f32>,
    /// Whether the line numbers on editors gutter are relative or not.
    ///
    /// Default: false
    pub relative_line_numbers: Option<bool>,
    /// When to populate a new search's query based on the text under the cursor.
    ///
    /// Default: always
    pub seed_search_query_from_cursor: Option<SeedQuerySetting>,
    pub use_smartcase_search: Option<bool>,
    /// The key to use for adding multiple cursors
    ///
    /// Default: alt
    pub multi_cursor_modifier: Option<MultiCursorModifier>,
    /// Hide the values of variables in `private` files, as defined by the
    /// private_files setting. This only changes the visual representation,
    /// the values are still present in the file and can be selected / copied / pasted
    ///
    /// Default: false
    pub redact_private_values: Option<bool>,

    /// How many lines to expand the multibuffer excerpts by default
    ///
    /// Default: 3
    pub expand_excerpt_lines: Option<u32>,

    /// Whether to enable middle-click paste on Linux
    ///
    /// Default: true
    pub middle_click_paste: Option<bool>,

    /// What to do when multibuffer is double clicked in some of its excerpts
    /// (parts of singleton buffers).
    ///
    /// Default: select
    pub double_click_in_multibuffer: Option<DoubleClickInMultibuffer>,
    /// Whether the editor search results will loop
    ///
    /// Default: true
    pub search_wrap: Option<bool>,

    /// Defaults to use when opening a new buffer and project search items.
    ///
    /// Default: nothing is enabled
    pub search: Option<SearchSettings>,

    /// Whether to automatically show a signature help pop-up or not.
    ///
    /// Default: false
    pub auto_signature_help: Option<bool>,

    /// Whether to show the signature help pop-up after completions or bracket pairs inserted.
    ///
    /// Default: false
    pub show_signature_help_after_edits: Option<bool>,

    /// Whether to show the inline completions next to the completions provided by a language server.
    /// Only has an effect if inline completion provider supports it.
    ///
    /// Default: true
    pub show_inline_completions_in_menu: Option<bool>,

    /// Jupyter REPL settings.
    pub jupyter: Option<JupyterContent>,
}

// Toolbar related settings
#[derive(Clone, Default, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
pub struct ToolbarContent {
    /// Whether to display breadcrumbs in the editor toolbar.
    ///
    /// Default: true
    pub breadcrumbs: Option<bool>,
    /// Whether to display quick action buttons in the editor toolbar.
    ///
    /// Default: true
    pub quick_actions: Option<bool>,

    /// Whether to show the selections menu in the editor toolbar
    ///
    /// Default: true
    pub selections_menu: Option<bool>,
}

/// Scrollbar related settings
#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq)]
pub struct ScrollbarContent {
    /// When to show the scrollbar in the editor.
    ///
    /// Default: auto
    pub show: Option<ShowScrollbar>,
    /// Whether to show git diff indicators in the scrollbar.
    ///
    /// Default: true
    pub git_diff: Option<bool>,
    /// Whether to show buffer search result indicators in the scrollbar.
    ///
    /// Default: true
    pub search_results: Option<bool>,
    /// Whether to show selected symbol occurrences in the scrollbar.
    ///
    /// Default: true
    pub selected_symbol: Option<bool>,
    /// Which diagnostic indicators to show in the scrollbar:
    ///
    /// Default: all
    pub diagnostics: Option<ScrollbarDiagnostics>,
    /// Whether to show cursor positions in the scrollbar.
    ///
    /// Default: true
    pub cursors: Option<bool>,
    /// Forcefully enable or disable the scrollbar for each axis
    pub axes: Option<ScrollbarAxesContent>,
}

/// Forcefully enable or disable the scrollbar for each axis
#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq)]
pub struct ScrollbarAxesContent {
    /// When false, forcefully disables the horizontal scrollbar. Otherwise, obey other settings.
    ///
    /// Default: true
    horizontal: Option<bool>,

    /// When false, forcefully disables the vertical scrollbar. Otherwise, obey other settings.
    ///
    /// Default: true
    vertical: Option<bool>,
}

/// Gutter related settings
#[derive(Copy, Clone, Debug, Default, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
pub struct GutterContent {
    /// Whether to show line numbers in the gutter.
    ///
    /// Default: true
    pub line_numbers: Option<bool>,
    /// Whether to show code action buttons in the gutter.
    ///
    /// Default: true
    pub code_actions: Option<bool>,
    /// Whether to show runnable buttons in the gutter.
    ///
    /// Default: true
    pub runnables: Option<bool>,
    /// Whether to show fold buttons in the gutter.
    ///
    /// Default: true
    pub folds: Option<bool>,
}

impl EditorSettings {
    pub fn jupyter_enabled(cx: &App) -> bool {
        EditorSettings::get_global(cx).jupyter.enabled
    }
}

impl Settings for EditorSettings {
    const KEY: Option<&'static str> = None;

    type FileContent = EditorSettingsContent;

    fn load(sources: SettingsSources<Self::FileContent>, _: &mut App) -> anyhow::Result<Self> {
        sources.json_merge()
    }
}