use std::path::PathBuf;use std::sync::Arc;use std::sync::OnceLock; use anyhow::Context as _;use anyhow::{Result, anyhow};use chrono::DateTime;use collections::HashSet;use fs::Fs;use futures::{AsyncBufReadExt, AsyncReadExt, StreamExt, io::BufReader, stream::BoxStream};use gpui::WeakEntity;use gpui::{App, AsyncApp, Global, prelude::*};use http_client::{AsyncBody, HttpClient, Method, Request as HttpRequest};use itertools::Itertools;use paths::home_dir;use serde::{Deserialize, Serialize};use settings::watch_config_dir; pub const COPILOT_OAUTH_ENV_VAR: &str = "GH_COPILOT_TOKEN"; #[derive(Default, Clone, Debug, PartialEq)]pub struct CopilotChatConfiguration {    pub enterprise_uri: Option<String>,} impl CopilotChatConfiguration {    pub fn token_url(&self) -> String {        if let Some(enterprise_uri) = &self.enterprise_uri {            let domain = Self::parse_domain(enterprise_uri);            format!("https://api.{}/copilot_internal/v2/token", domain)        } else {            "https://api.github.com/copilot_internal/v2/token".to_string()        }    }     pub fn oauth_domain(&self) -> String {        if let Some(enterprise_uri) = &self.enterprise_uri {            Self::parse_domain(enterprise_uri)        } else {            "github.com".to_string()        }    }     pub fn api_url_from_endpoint(&self, endpoint: &str) -> String {        format!("{}/chat/completions", endpoint)    }     pub fn models_url_from_endpoint(&self, endpoint: &str) -> String {        format!("{}/models", endpoint)    }     fn parse_domain(enterprise_uri: &str) -> String {        let uri = enterprise_uri.trim_end_matches('/');         if let Some(domain) = uri.strip_prefix("https://") {            domain.split('/').next().unwrap_or(domain).to_string()        } else if let Some(domain) = uri.strip_prefix("http://") {            domain.split('/').next().unwrap_or(domain).to_string()        } else {            uri.split('/').next().unwrap_or(uri).to_string()        }    }} // Copilot's base model; defined by Microsoft in premium requests table// This will be moved to the front of the Copilot model list, and will be used for// 'fast' requests (e.g. title generation)// https://docs.github.com/en/copilot/managing-copilot/monitoring-usage-and-entitlements/about-premium-requestsconst DEFAULT_MODEL_ID: &str = "gpt-4.1"; #[derive(Clone, Copy, Serialize, Deserialize, Debug, Eq, PartialEq)]#[serde(rename_all = "lowercase")]pub enum Role {    User,    Assistant,    System,} #[derive(Deserialize)]struct ModelSchema {    #[serde(deserialize_with = "deserialize_models_skip_errors")]    data: Vec<Model>,} fn deserialize_models_skip_errors<'de, D>(deserializer: D) -> Result<Vec<Model>, D::Error>where    D: serde::Deserializer<'de>,{    let raw_values = Vec::<serde_json::Value>::deserialize(deserializer)?;    let models = raw_values        .into_iter()        .filter_map(|value| match serde_json::from_value::<Model>(value) {            Ok(model) => Some(model),            Err(err) => {                log::warn!("GitHub Copilot Chat model failed to deserialize: {:?}", err);                None            }        })        .collect();     Ok(models)} #[derive(Clone, Serialize, Deserialize, Debug, Eq, PartialEq)]pub struct Model {    capabilities: ModelCapabilities,    id: String,    name: String,    policy: Option<ModelPolicy>,    vendor: ModelVendor,    model_picker_enabled: bool,} #[derive(Clone, Serialize, Deserialize, Debug, Eq, PartialEq)]struct ModelCapabilities {    family: String,    #[serde(default)]    limits: ModelLimits,    supports: ModelSupportedFeatures,} #[derive(Default, Clone, Serialize, Deserialize, Debug, Eq, PartialEq)]struct ModelLimits {    #[serde(default)]    max_context_window_tokens: usize,    #[serde(default)]    max_output_tokens: usize,    #[serde(default)]    max_prompt_tokens: u64,} #[derive(Clone, Serialize, Deserialize, Debug, Eq, PartialEq)]struct ModelPolicy {    state: String,} #[derive(Clone, Serialize, Deserialize, Debug, Eq, PartialEq)]struct ModelSupportedFeatures {    #[serde(default)]    streaming: bool,    #[serde(default)]    tool_calls: bool,    #[serde(default)]    parallel_tool_calls: bool,    #[serde(default)]    vision: bool,} #[derive(Clone, Copy, Serialize, Deserialize, Debug, Eq, PartialEq)]pub enum ModelVendor {    // Azure OpenAI should have no functional difference from OpenAI in Copilot Chat    #[serde(alias = "Azure OpenAI")]    OpenAI,    Google,    Anthropic,} #[derive(Serialize, Deserialize, Debug, Eq, PartialEq, Clone)]#[serde(tag = "type")]pub enum ChatMessagePart {    #[serde(rename = "text")]    Text { text: String },    #[serde(rename = "image_url")]    Image { image_url: ImageUrl },} #[derive(Serialize, Deserialize, Debug, Eq, PartialEq, Clone)]pub struct ImageUrl {    pub url: String,} impl Model {    pub fn uses_streaming(&self) -> bool {        self.capabilities.supports.streaming    }     pub fn id(&self) -> &str {        self.id.as_str()    }     pub fn display_name(&self) -> &str {        self.name.as_str()    }     pub fn max_token_count(&self) -> u64 {        self.capabilities.limits.max_prompt_tokens    }     pub fn supports_tools(&self) -> bool {        self.capabilities.supports.tool_calls    }     pub fn vendor(&self) -> ModelVendor {        self.vendor    }     pub fn supports_vision(&self) -> bool {        self.capabilities.supports.vision    }     pub fn supports_parallel_tool_calls(&self) -> bool {        self.capabilities.supports.parallel_tool_calls    }} #[derive(Serialize, Deserialize)]pub struct Request {    pub intent: bool,    pub n: usize,    pub stream: bool,    pub temperature: f32,    pub model: String,    pub messages: Vec<ChatMessage>,    #[serde(default, skip_serializing_if = "Vec::is_empty")]    pub tools: Vec<Tool>,    #[serde(default, skip_serializing_if = "Option::is_none")]    pub tool_choice: Option<ToolChoice>,} #[derive(Serialize, Deserialize)]pub struct Function {    pub name: String,    pub description: String,    pub parameters: serde_json::Value,} #[derive(Serialize, Deserialize)]#[serde(tag = "type", rename_all = "snake_case")]pub enum Tool {    Function { function: Function },} #[derive(Serialize, Deserialize)]#[serde(rename_all = "lowercase")]pub enum ToolChoice {    Auto,    Any,    None,} #[derive(Serialize, Deserialize, Debug)]#[serde(tag = "role", rename_all = "lowercase")]pub enum ChatMessage {    Assistant {        content: ChatMessageContent,        #[serde(default, skip_serializing_if = "Vec::is_empty")]        tool_calls: Vec<ToolCall>,    },    User {        content: ChatMessageContent,    },    System {        content: String,    },    Tool {        content: ChatMessageContent,        tool_call_id: String,    },} #[derive(Debug, Serialize, Deserialize)]#[serde(untagged)]pub enum ChatMessageContent {    Plain(String),    Multipart(Vec<ChatMessagePart>),} impl ChatMessageContent {    pub fn empty() -> Self {        ChatMessageContent::Multipart(vec![])    }} impl From<Vec<ChatMessagePart>> for ChatMessageContent {    fn from(mut parts: Vec<ChatMessagePart>) -> Self {        if let [ChatMessagePart::Text { text }] = parts.as_mut_slice() {            ChatMessageContent::Plain(std::mem::take(text))        } else {            ChatMessageContent::Multipart(parts)        }    }} impl From<String> for ChatMessageContent {    fn from(text: String) -> Self {        ChatMessageContent::Plain(text)    }} #[derive(Serialize, Deserialize, Debug, Eq, PartialEq)]pub struct ToolCall {    pub id: String,    #[serde(flatten)]    pub content: ToolCallContent,} #[derive(Serialize, Deserialize, Debug, Eq, PartialEq)]#[serde(tag = "type", rename_all = "lowercase")]pub enum ToolCallContent {    Function { function: FunctionContent },} #[derive(Serialize, Deserialize, Debug, Eq, PartialEq)]pub struct FunctionContent {    pub name: String,    pub arguments: String,} #[derive(Deserialize, Debug)]#[serde(tag = "type", rename_all = "snake_case")]pub struct ResponseEvent {    pub choices: Vec<ResponseChoice>,    pub id: String,    pub usage: Option<Usage>,} #[derive(Deserialize, Debug)]pub struct Usage {    pub completion_tokens: u64,    pub prompt_tokens: u64,    pub total_tokens: u64,} #[derive(Debug, Deserialize)]pub struct ResponseChoice {    pub index: usize,    pub finish_reason: Option<String>,    pub delta: Option<ResponseDelta>,    pub message: Option<ResponseDelta>,} #[derive(Debug, Deserialize)]pub struct ResponseDelta {    pub content: Option<String>,    pub role: Option<Role>,    #[serde(default)]    pub tool_calls: Vec<ToolCallChunk>,} #[derive(Deserialize, Debug, Eq, PartialEq)]pub struct ToolCallChunk {    pub index: usize,    pub id: Option<String>,    pub function: Option<FunctionChunk>,} #[derive(Deserialize, Debug, Eq, PartialEq)]pub struct FunctionChunk {    pub name: Option<String>,    pub arguments: Option<String>,} #[derive(Deserialize)]struct ApiTokenResponse {    token: String,    expires_at: i64,    endpoints: ApiTokenResponseEndpoints,} #[derive(Deserialize)]struct ApiTokenResponseEndpoints {    api: String,} #[derive(Clone)]struct ApiToken {    api_key: String,    expires_at: DateTime<chrono::Utc>,    api_endpoint: String,} impl ApiToken {    pub fn remaining_seconds(&self) -> i64 {        self.expires_at            .timestamp()            .saturating_sub(chrono::Utc::now().timestamp())    }} impl TryFrom<ApiTokenResponse> for ApiToken {    type Error = anyhow::Error;     fn try_from(response: ApiTokenResponse) -> Result<Self, Self::Error> {        let expires_at =            DateTime::from_timestamp(response.expires_at, 0).context("invalid expires_at")?;         Ok(Self {            api_key: response.token,            expires_at,            api_endpoint: response.endpoints.api,        })    }} struct GlobalCopilotChat(gpui::Entity<CopilotChat>); impl Global for GlobalCopilotChat {} pub struct CopilotChat {    oauth_token: Option<String>,    api_token: Option<ApiToken>,    configuration: CopilotChatConfiguration,    models: Option<Vec<Model>>,    client: Arc<dyn HttpClient>,} pub fn init(    fs: Arc<dyn Fs>,    client: Arc<dyn HttpClient>,    configuration: CopilotChatConfiguration,    cx: &mut App,) {    let copilot_chat = cx.new(|cx| CopilotChat::new(fs, client, configuration, cx));    cx.set_global(GlobalCopilotChat(copilot_chat));} pub fn copilot_chat_config_dir() -> &'static PathBuf {    static COPILOT_CHAT_CONFIG_DIR: OnceLock<PathBuf> = OnceLock::new();     COPILOT_CHAT_CONFIG_DIR.get_or_init(|| {        let config_dir = if cfg!(target_os = "windows") {            dirs::data_local_dir().expect("failed to determine LocalAppData directory")        } else {            std::env::var("XDG_CONFIG_HOME")                .map(PathBuf::from)                .unwrap_or_else(|_| home_dir().join(".config"))        };         config_dir.join("github-copilot")    })} fn copilot_chat_config_paths() -> [PathBuf; 2] {    let base_dir = copilot_chat_config_dir();    [base_dir.join("hosts.json"), base_dir.join("apps.json")]} impl CopilotChat {    pub fn global(cx: &App) -> Option<gpui::Entity<Self>> {        cx.try_global::<GlobalCopilotChat>()            .map(|model| model.0.clone())    }     fn new(        fs: Arc<dyn Fs>,        client: Arc<dyn HttpClient>,        configuration: CopilotChatConfiguration,        cx: &mut Context<Self>,    ) -> Self {        let config_paths: HashSet<PathBuf> = copilot_chat_config_paths().into_iter().collect();        let dir_path = copilot_chat_config_dir();         cx.spawn(async move |this, cx| {            let mut parent_watch_rx = watch_config_dir(                cx.background_executor(),                fs.clone(),                dir_path.clone(),                config_paths,            );            while let Some(contents) = parent_watch_rx.next().await {                let oauth_domain =                    this.read_with(cx, |this, _| this.configuration.oauth_domain())?;                let oauth_token = extract_oauth_token(contents, &oauth_domain);                 this.update(cx, |this, cx| {                    this.oauth_token = oauth_token.clone();                    cx.notify();                })?;                 if oauth_token.is_some() {                    Self::update_models(&this, cx).await?;                }            }            anyhow::Ok(())        })        .detach_and_log_err(cx);         let this = Self {            oauth_token: std::env::var(COPILOT_OAUTH_ENV_VAR).ok(),            api_token: None,            models: None,            configuration,            client,        };         if this.oauth_token.is_some() {            cx.spawn(async move |this, mut cx| Self::update_models(&this, &mut cx).await)                .detach_and_log_err(cx);        }         this    }     async fn update_models(this: &WeakEntity<Self>, cx: &mut AsyncApp) -> Result<()> {        let (oauth_token, client, configuration) = this.read_with(cx, |this, _| {            (                this.oauth_token.clone(),                this.client.clone(),                this.configuration.clone(),            )

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