//! Airtable integration for [Flows.network](https://flows.network)
//!
//! # Quick Start
//!
//! To get started, let's write a very tiny flow function.
//!
//! ```rust
//! use airtable_flows::create_record;
//! use slack_flows::{listen_to_channel};
//!
//! #[no_mangle]
//! pub fn run() {
//!     listen_to_channel("myworkspace", "mychannel", |sm| {
//!         let record = serde_json::json!({
//!             "Name": sm.text,
//!         });
//!         create_record("accountName", "mybaseId", "mytable", record);
//!     });
//! }
//! ```
//!
//! When the Slack message is received, create a new record in Airtable using [create_record].

use http_req::{
    request::{Method, Request},
    uri::Uri,
};
use lazy_static::lazy_static;
use serde_json::Value;
use urlencoding::encode;

lazy_static! {
    static ref AIRTABLE_API_PREFIX: String = String::from(
        std::option_env!("AIRTABLE_API_PREFIX")
            .unwrap_or("https://airtable-flows-extension.vercel.app/api")
    );
}

extern "C" {
    fn get_flows_user(p: *mut u8) -> i32;
    fn set_error_log(p: *const u8, len: i32);
}

/// Create a new record in the specified table.
///
/// `account` is the account name when you connect
/// [Flows.network](https://flows.network) platform with your Airtable account.
///
/// `base_id` is the id of the base which the table belongs to.
///
/// `table_name` is the name of the table.
///
/// `text` is a serde_json::Value::Object whose key is the field name
/// of the table.
///
/// If you have not connected your Airtable account with [Flows.network platform](https://flows.network),
/// you will receive an error in the flow's building log or running log.
///
pub fn create_record(account: &str, base_id: &str, table_name: &str, text: Value) {
    unsafe {
        let mut flows_user = Vec::<u8>::with_capacity(100);
        let c = get_flows_user(flows_user.as_mut_ptr());
        flows_user.set_len(c as usize);
        let flows_user = String::from_utf8(flows_user).unwrap();

        let mut writer = Vec::new();
        let uri = format!(
            "{}/{}/create_record?account={}&base={}&table={}",
            AIRTABLE_API_PREFIX.as_str(),
            flows_user,
            encode(account),
            encode(base_id),
            encode(table_name)
        );
        let uri = Uri::try_from(uri.as_str()).unwrap();
        let body = serde_json::to_vec(&text).unwrap_or_default();
        if let Ok(res) = Request::new(&uri)
            .method(Method::POST)
            .header("Content-Type", "application/json")
            .header("Content-Length", &body.len())
            .body(&body)
            .send(&mut writer)
        {
            if !res.status_code().is_success() {
                set_error_log(writer.as_ptr(), writer.len() as i32);
            }
        }
    }
}

/// Update a record in the specified table.
///
/// `account` is the account name when you connect
/// [Flows.network](https://flows.network) platform with your Airtable account.
///
/// `base_id` is the id of the base which the table belongs to.
///
/// `table_name` is the name of the table.
///
/// `record_id` is the id of the record to be updated.
///
/// `text` is a serde_json::Value::Object whose key is the field name
/// of the table.
///
/// If you have not connected your Airtable account with [Flows.network platform](https://flows.network),
/// you will receive an error in the flow's building log or running log.
///
pub fn update_record(account: &str, base_id: &str, table_name: &str, record_id: &str, text: Value) {
    unsafe {
        let mut flows_user = Vec::<u8>::with_capacity(100);
        let c = get_flows_user(flows_user.as_mut_ptr());
        flows_user.set_len(c as usize);
        let flows_user = String::from_utf8(flows_user).unwrap();

        let mut writer = Vec::new();
        let uri = format!(
            "{}/{}/update_record?account={}&base={}&table={}&record_id={}",
            AIRTABLE_API_PREFIX.as_str(),
            flows_user,
            encode(account),
            encode(base_id),
            encode(table_name),
            encode(record_id)
        );
        let uri = Uri::try_from(uri.as_str()).unwrap();
        let body = serde_json::to_vec(&text).unwrap_or_default();
        if let Ok(res) = Request::new(&uri)
            .method(Method::PATCH)
            .header("Content-Type", "application/json")
            .header("Content-Length", &body.len())
            .body(&body)
            .send(&mut writer)
        {
            if !res.status_code().is_success() {
                set_error_log(writer.as_ptr(), writer.len() as i32);
            }
        }
    }
}

/// Search records in the specified table.
///
/// `account` is the account name when you connect
/// [Flows.network](https://flows.network) platform with your Airtable account.
///
/// `base_id` is the id of the base which the table belongs to.
///
/// `table_name` is the name of the table.
///
/// `filter` is a [formula](https://support.airtable.com/docs/formula-field-reference) string used to filter records.
///
/// If you have not connected your Airtable account with [Flows.network platform](https://flows.network),
/// you will receive an error in the flow's building log or running log.
///
pub fn search_records(
    account: &str,
    base_id: &str,
    table_name: &str,
    filter: &str,
) -> Option<Value> {
    unsafe {
        let mut flows_user = Vec::<u8>::with_capacity(100);
        let c = get_flows_user(flows_user.as_mut_ptr());
        flows_user.set_len(c as usize);
        let flows_user = String::from_utf8(flows_user).unwrap();

        let mut writer = Vec::new();
        let uri = format!(
            "{}/{}/search_records?account={}&base={}&table={}&filter={}",
            AIRTABLE_API_PREFIX.as_str(),
            flows_user,
            encode(account),
            encode(base_id),
            encode(table_name),
            encode(filter)
        );
        let uri = Uri::try_from(uri.as_str()).unwrap();
        match Request::new(&uri).method(Method::GET).send(&mut writer) {
            Ok(res) => match res.status_code().is_success() {
                true => match serde_json::from_slice(&writer) {
                    Ok(records) => Some(records),
                    Err(_) => None,
                },
                false => {
                    set_error_log(writer.as_ptr(), writer.len() as i32);
                    None
                }
            },
            Err(_) => None,
        }
    }
}