use anyhow::{anyhow, Result};
use async_trait::async_trait;
use collections::HashMap;
use feature_flags::FeatureFlagAppExt;
use futures::{future::BoxFuture, FutureExt, StreamExt};
use gpui::AppContext;
use language::{LanguageRegistry, LanguageServerName, LspAdapter, LspAdapterDelegate};
use lsp::LanguageServerBinary;
use node_runtime::NodeRuntime;
use serde_json::json;
use settings::{KeymapFile, SettingsJsonSchemaParams, SettingsStore};
use smol::fs;
use std::{
    any::Any,
    ffi::OsString,
    future,
    path::{Path, PathBuf},
    sync::Arc,
};
use util::{paths, ResultExt};

const SERVER_PATH: &'static str =
    "node_modules/vscode-json-languageserver/bin/vscode-json-languageserver";

fn server_binary_arguments(server_path: &Path) -> Vec<OsString> {
    vec![server_path.into(), "--stdio".into()]
}

pub struct JsonLspAdapter {
    node: Arc<NodeRuntime>,
    languages: Arc<LanguageRegistry>,
}

impl JsonLspAdapter {
    pub fn new(node: Arc<NodeRuntime>, languages: Arc<LanguageRegistry>) -> Self {
        JsonLspAdapter { node, languages }
    }
}

#[async_trait]
impl LspAdapter for JsonLspAdapter {
    async fn name(&self) -> LanguageServerName {
        LanguageServerName("json-language-server".into())
    }

    async fn fetch_latest_server_version(
        &self,
        _: &dyn LspAdapterDelegate,
    ) -> Result<Box<dyn 'static + Send + Any>> {
        Ok(Box::new(
            self.node
                .npm_package_latest_version("vscode-json-languageserver")
                .await?,
        ) as Box<_>)
    }

    async fn fetch_server_binary(
        &self,
        version: Box<dyn 'static + Send + Any>,
        container_dir: PathBuf,
        _: &dyn LspAdapterDelegate,
    ) -> Result<LanguageServerBinary> {
        let version = version.downcast::<String>().unwrap();
        let server_path = container_dir.join(SERVER_PATH);

        if fs::metadata(&server_path).await.is_err() {
            self.node
                .npm_install_packages(
                    &container_dir,
                    [("vscode-json-languageserver", version.as_str())],
                )
                .await?;
        }

        Ok(LanguageServerBinary {
            path: self.node.binary_path().await?,
            arguments: server_binary_arguments(&server_path),
        })
    }

    async fn cached_server_binary(
        &self,
        container_dir: PathBuf,
        _: &dyn LspAdapterDelegate,
    ) -> Option<LanguageServerBinary> {
        get_cached_server_binary(container_dir, &self.node).await
    }

    async fn installation_test_binary(
        &self,
        container_dir: PathBuf,
    ) -> Option<LanguageServerBinary> {
        get_cached_server_binary(container_dir, &self.node).await
    }

    async fn initialization_options(&self) -> Option<serde_json::Value> {
        Some(json!({
            "provideFormatter": true
        }))
    }

    fn workspace_configuration(
        &self,
        cx: &mut AppContext,
    ) -> Option<BoxFuture<'static, serde_json::Value>> {
        let action_names = cx.all_action_names().collect::<Vec<_>>();
        let staff_mode = cx.is_staff();
        let language_names = &self.languages.language_names();
        let settings_schema = cx.global::<SettingsStore>().json_schema(
            &SettingsJsonSchemaParams {
                language_names,
                staff_mode,
            },
            cx,
        );
        Some(
            future::ready(serde_json::json!({
                "json": {
                    "format": {
                        "enable": true,
                    },
                    "schemas": [
                        {
                            "fileMatch": [
                                schema_file_match(&paths::SETTINGS),
                                &*paths::LOCAL_SETTINGS_RELATIVE_PATH,
                            ],
                            "schema": settings_schema,
                        },
                        {
                            "fileMatch": [schema_file_match(&paths::KEYMAP)],
                            "schema": KeymapFile::generate_json_schema(&action_names),
                        }
                    ]
                }
            }))
            .boxed(),
        )
    }

    async fn language_ids(&self) -> HashMap<String, String> {
        [("JSON".into(), "jsonc".into())].into_iter().collect()
    }
}

async fn get_cached_server_binary(
    container_dir: PathBuf,
    node: &NodeRuntime,
) -> Option<LanguageServerBinary> {
    (|| async move {
        let mut last_version_dir = None;
        let mut entries = fs::read_dir(&container_dir).await?;
        while let Some(entry) = entries.next().await {
            let entry = entry?;
            if entry.file_type().await?.is_dir() {
                last_version_dir = Some(entry.path());
            }
        }

        let last_version_dir = last_version_dir.ok_or_else(|| anyhow!("no cached binary"))?;
        let server_path = last_version_dir.join(SERVER_PATH);
        if server_path.exists() {
            Ok(LanguageServerBinary {
                path: node.binary_path().await?,
                arguments: server_binary_arguments(&server_path),
            })
        } else {
            Err(anyhow!(
                "missing executable in directory {:?}",
                last_version_dir
            ))
        }
    })()
    .await
    .log_err()
}

fn schema_file_match(path: &Path) -> &Path {
    path.strip_prefix(path.parent().unwrap().parent().unwrap())
        .unwrap()
}
