//! Get a source of economic data
//! 
//! [https://research.stlouisfed.org/docs/api/fred/source.html](https://research.stlouisfed.org/docs/api/fred/source.html)
//! 
//! ```
//! use fred_rs::client::FredClient;
//! use fred_rs::source::Response;
//! 
//! let mut c = match FredClient::new() {
//!     Ok(c) => c,
//!     Err(msg) => {
//!         println!("{}", msg);
//!         assert_eq!(2, 1);
//!         return
//!     },
//! };
//! 
//! let resp: Response = match c.source(1, None) {
//!     Ok(resp) => resp,
//!     Err(msg) => {
//!         println!("{}", msg);
//!         assert_eq!(2, 1);
//!         return
//!     },
//! };
//! 
//! for item in resp.sources {
//!     match item.link {
//!         Some(l) => println!("{}: {}", item.name, l),
//!         None => println!("{}: null", item.name),
//!     }
//! }
//! ```

pub mod releases;

// -----------------------------------------------------------------------------

use serde::Deserialize;
use std::fmt::{self, Display, Formatter};

#[derive(Deserialize, Clone, Debug, Default)]
/// Response data structure for the fred/source endpoint
/// 
/// [https://research.stlouisfed.org/docs/api/fred/source.html] (https://research.stlouisfed.org/docs/api/fred/source.html)
pub struct Response {
    /// The Real Time start date for the request
    pub realtime_start: String,
    /// The Real Time end data for the request
    pub realtime_end: String,
    /// How the results are ordered
    pub order_by: Option<String>,
    // Results are listed in ascending or descending
    pub sort_order: Option<String>,
    /// Number of results returned
    pub count: Option<usize>,
    /// ???
    pub offset: Option<usize>,
    /// Maximum number of results to return
    pub limit: Option<usize>,
    /// Series returned by the search
    pub sources: Vec<Source>,
}

impl Display for Response {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        for item in self.sources.iter() {
            match item.fmt(f) {
                Ok(_) => (),
                Err(e) => return Err(e),
            }
            match writeln!(f, "") {
                Ok(_) => (),
                Err(e) => return Err(e),
            }
        }
        Ok(())
    }
}

#[derive(Deserialize, Clone, Debug, Default)]
/// Data structure containing infomation about a particular tag
/// 
/// [https://research.stlouisfed.org/docs/api/fred/source.html](https://research.stlouisfed.org/docs/api/fred/source.html)
pub struct Source {
    /// The source ID
    pub id: usize,
    /// The Real Time start date for the request
    pub realtime_start: String,
    /// The Real Time end data for the request
    pub realtime_end: String,
    /// The source name
    pub name: String,
    /// A link to the source's website
    pub link: Option<String>,
    /// Additional notes about the source
    pub notes: Option<String>
}

impl Display for Source {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        write!(f, "Soruce {}: {}", self.id, self.name)
    }
}

pub struct Builder {
    option_string: String,
}

impl Builder {

    /// Initializes a new sources::Builder that can be used to add commands to an API request
    /// 
    /// The builder does not do validity checking of the arguments nor does it check for duplicates.
    /// 
    /// ```
    /// use fred_rs::sources::Builder;
    /// // Create a new builder
    /// let mut builder = Builder::new();
    /// // add arguments to the builder
    /// builder
    ///     .realtime_start("1900-01-01")
    ///     .realtime_end("2000-01-01");
    /// ```
    pub fn new() -> Builder {
        Builder {
            option_string: String::new(),
        }
    }

    /// Returns the current arguments as a URL formatted string
    pub(crate) fn build(self) -> String {
        self.option_string
    }

    /// Adds a realtime_start argument to the builder
    /// 
    /// # Arguments
    /// * `start_date` - date formatted as YYYY-MM-DD
    /// 
    /// [https://research.stlouisfed.org/docs/api/fred/source.html#realtime_start](https://research.stlouisfed.org/docs/api/fred/source.html#realtime_start)
    pub fn realtime_start(&mut self, start_date: &str) -> &mut Builder {
        self.option_string += format!("&realtime_start={}", start_date).as_str();
        self
    }

    /// Adds a realtime_end argument to the builder
    /// 
    /// # Arguments
    /// * `end_date` - date formatted as YYYY-MM-DD
    /// 
    /// [https://research.stlouisfed.org/docs/api/fred/source.html#realtime_end](https://research.stlouisfed.org/docs/api/fred/source.html#realtime_end)
    pub fn realtime_end(&mut self, end_date: &str) -> &mut Builder {
        self.option_string += format!("&realtime_end={}", end_date).as_str();
        self
    }

}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::client::FredClient;

    #[test]
    fn source_no_options() {
        let mut c = match FredClient::new() {
            Ok(c) => c,
            Err(msg) => {
                println!("{}", msg);
                assert_eq!(2, 1);
                return
            },
        };

        let resp: Response = match c.source(1, None) {
            Ok(resp) => resp,
            Err(msg) => {
                println!("{}", msg);
                assert_eq!(2, 1);
                return
            },
        };

        for s in resp.sources {
            match s.link {
                Some(l) => println!("{}: {}", s.name, l),
                None => println!("{}", s.name)
            }
        }
    } 
}