use super::headermap::HeaderMap;
use anyhow::{anyhow, bail, Context};
use std::str::FromStr;

#[derive(Debug)]
pub struct Response {
    pub code: u16,
    pub headers: HeaderMap,
}

impl FromStr for Response {
    type Err = anyhow::Error;
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let mut lines = s.lines();
        let statusline = lines.next().ok_or(anyhow!("status line missing"))?;
        let (sipver, rest) = statusline
            .split_once(" ")
            .ok_or(anyhow!("status line malformed"))?;
        let (code, _status_str) = rest
            .split_once(" ")
            .ok_or(anyhow!("status line malformed"))?;
        let code = u16::from_str(code).context("status code")?;

        let Some(ver) = sipver.strip_prefix("SIP/") else {
            bail!("sip version malformed");
        };
        if ver != "2.0" {
            bail!("sip version {ver:?} is not supported");
        }

        let mut headers = HeaderMap::new();
        for line in lines {
            // TODO multiline values
            let (key, value) = line.split_once(":").ok_or(anyhow!("header malformed"))?;
            headers.insert_raw(key.trim().to_string(), value.trim().to_string())
        }

        Ok(Self { code, headers })
    }
}