use collections::HashMap;
use gpui::AppContext;
use schemars::JsonSchema;
use serde::{Deserialize, Serialize};
use settings::{Settings, SettingsSources};
use std::{sync::Arc, time::Duration};

#[derive(Clone, Default, Serialize, Deserialize, JsonSchema)]
pub struct ProjectSettings {
    /// Configuration for language servers.
    ///
    /// The following settings can be overridden for specific language servers:
    /// - initialization_options
    /// To override settings for a language, add an entry for that language server's
    /// name to the lsp value.
    /// Default: null
    #[serde(default)]
    pub lsp: HashMap<Arc<str>, LspSettings>,

    /// Configuration for Git-related features
    #[serde(default)]
    pub git: GitSettings,

    /// Configuration for how direnv configuration should be loaded
    #[serde(default)]
    pub load_direnv: DirenvSettings,
}

#[derive(Clone, Debug, Default, Serialize, Deserialize, JsonSchema)]
#[serde(rename_all = "snake_case")]
pub enum DirenvSettings {
    /// Load direnv configuration through a shell hook
    #[default]
    ShellHook,
    /// Load direnv configuration directly using `direnv export json`
    ///
    /// Warning: This option is experimental and might cause some inconsistent behaviour compared to using the shell hook.
    /// If it does, please report it to GitHub
    Direct,
}

#[derive(Copy, Clone, Debug, Default, Serialize, Deserialize, JsonSchema)]
pub struct GitSettings {
    /// Whether or not to show the git gutter.
    ///
    /// Default: tracked_files
    pub git_gutter: Option<GitGutterSetting>,
    pub gutter_debounce: Option<u64>,
    /// Whether or not to show git blame data inline in
    /// the currently focused line.
    ///
    /// Default: on
    pub inline_blame: Option<InlineBlameSettings>,
}

impl GitSettings {
    pub fn inline_blame_enabled(&self) -> bool {
        #[allow(unknown_lints, clippy::manual_unwrap_or_default)]
        match self.inline_blame {
            Some(InlineBlameSettings { enabled, .. }) => enabled,
            _ => false,
        }
    }

    pub fn inline_blame_delay(&self) -> Option<Duration> {
        match self.inline_blame {
            Some(InlineBlameSettings {
                delay_ms: Some(delay_ms),
                ..
            }) if delay_ms > 0 => Some(Duration::from_millis(delay_ms)),
            _ => None,
        }
    }
}

#[derive(Clone, Copy, Debug, Default, Serialize, Deserialize, JsonSchema)]
#[serde(rename_all = "snake_case")]
pub enum GitGutterSetting {
    /// Show git gutter in tracked files.
    #[default]
    TrackedFiles,
    /// Hide git gutter
    Hide,
}

#[derive(Clone, Copy, Debug, Default, Serialize, Deserialize, JsonSchema)]
#[serde(rename_all = "snake_case")]
pub struct InlineBlameSettings {
    /// Whether or not to show git blame data inline in
    /// the currently focused line.
    ///
    /// Default: true
    #[serde(default = "true_value")]
    pub enabled: bool,
    /// Whether to only show the inline blame information
    /// after a delay once the cursor stops moving.
    ///
    /// Default: 0
    pub delay_ms: Option<u64>,
    /// The minimum column number to show the inline blame information at
    ///
    /// Default: 0
    pub min_column: Option<u32>,
}

const fn true_value() -> bool {
    true
}

#[derive(Clone, Debug, Default, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
pub struct BinarySettings {
    pub path: Option<String>,
    pub arguments: Option<Vec<String>>,
    pub path_lookup: Option<bool>,
}

#[derive(Clone, Debug, Default, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
#[serde(rename_all = "snake_case")]
pub struct LspSettings {
    pub binary: Option<BinarySettings>,
    pub initialization_options: Option<serde_json::Value>,
    pub settings: Option<serde_json::Value>,
}

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

    type FileContent = Self;

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