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//! The client for Slack API. <https://api.slack.com/methods>.

use sfr_types as st;

use crate::Request;
use st::{OauthV2AccessRequest, OauthV2AccessResponse};
use std::collections::HashMap;

/// The client for Slack API without OAuth.
#[derive(Clone)]
pub struct Client {
    /// The HTTP Client.
    client: reqwest::Client,

    /// The access_token.
    token: String,
}

/// The client for Slack API about OAuth.
#[derive(Clone)]
pub struct OauthClient {
    /// The HTTP Client.
    client: reqwest::Client,
}

impl Client {
    /// The constructor.
    pub fn new(client: reqwest::Client, token: String) -> Self {
        Self { client, token }
    }

    /// Returns the cloned inner HTTP client.
    pub fn clone_http_client(&self) -> reqwest::Client {
        self.client.clone()
    }

    /// Requests to Slack API.
    pub async fn request<R>(&self, request: R) -> Result<R::Response, st::Error>
    where
        R: Request,
    {
        request.request(self).await
    }

    /// Uploads files by `upload_url` from `files.getUploadURLExternal`.
    ///
    /// - `set`: (filename, (MIME type, file bytes))
    pub async fn upload_file_by_upload_file<M>(
        &self,
        upload_url: &str,
        set: M,
    ) -> Result<(), st::Error>
    where
        M: Into<HashMap<String, (&'static str, Vec<u8>)>>,
    {
        use reqwest::multipart::{Form, Part};

        let mut form = Form::new();
        for (filename, (mime, bytes)) in set.into().into_iter() {
            let part = Part::bytes(bytes)
                .file_name(filename.clone())
                .mime_str(mime)
                .map_err(st::Error::failed_creating_mulipart_data)?;
            form = form.part(filename.clone(), part);
        }

        let response = self
            .client()
            .post(upload_url)
            .multipart(form)
            .send()
            .await
            .map_err(|e| st::Error::failed_to_request_by_http("upload_url", e))?;
        tracing::debug!("response = {response:?}");

        Ok(())
    }

    /// Returns the reference of the inner HTTP client.
    pub(crate) fn client(&self) -> &reqwest::Client {
        &self.client
    }

    /// Returns the access_token.
    pub(crate) fn token(&self) -> &str {
        &self.token
    }
}

impl OauthClient {
    /// The constructor.
    pub fn new(client: reqwest::Client) -> Self {
        Self { client }
    }

    /// Requests `oauth.v2.access`.
    ///
    /// <https://api.slack.com/methods/oauth.v2.access>
    ///
    /// Can't implicit in `Client` since the token is obtained from `oauth_v2_access()`.
    pub async fn oauth_v2_access(
        &self,
        form: OauthV2AccessRequest<'_>,
    ) -> Result<OauthV2AccessResponse, st::Error> {
        #[allow(clippy::missing_docs_in_private_items)] // https://github.com/rust-lang/rust-clippy/issues/13298
        const URL: &str = "https://slack.com/api/oauth.v2.access";

        #[allow(clippy::missing_docs_in_private_items)] // https://github.com/rust-lang/rust-clippy/issues/13298
        const API_CODE: &str = "oauth.v2.access";

        tracing::debug!("form = {form:?}");

        let response = self
            .client
            .post(URL)
            .form(&form)
            .send()
            .await
            .map_err(|e| st::Error::failed_to_request_by_http(API_CODE, e))?;
        tracing::debug!("response = {response:?}");

        let body: serde_json::Value = response
            .json()
            .await
            .map_err(|e| st::Error::failed_to_read_json(API_CODE, e))?;
        tracing::debug!("body = {body:?}");

        body.try_into()
    }
}