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//! The module defines decoder plugin data structures

use crate::convert::FromIter;
use crate::error::Error;

/// Decoder plugin
#[derive(Clone, Debug, PartialEq)]
pub struct Plugin {
    /// name
    pub name: String,
    /// supported file suffixes (extensions)
    pub suffixes: Vec<String>,
    /// supported MIME-types
    pub mime_types: Vec<String>,
}

impl FromIter for Vec<Plugin> {
    fn from_iter<I: Iterator<Item = Result<(String, String), Error>>>(iter: I) -> Result<Self, Error> {
        let mut result = Vec::new();
        let mut plugin: Option<Plugin> = None;
        for reply in iter {
            let (a, b) = reply?;
            match &*a {
                "plugin" => {
                    if let Some(p) = plugin {
                        result.push(p)
                    }

                    plugin = Some(Plugin { name: b, suffixes: Vec::new(), mime_types: Vec::new() });
                }
                "mime_type" => {
                    if let Some(p) = plugin.as_mut() {
                        p.mime_types.push(b)
                    }
                }
                "suffix" => {
                    if let Some(p) = plugin.as_mut() {
                        p.suffixes.push(b)
                    }
                }
                _ => unreachable!(),
            }
        }
        if let Some(p) = plugin {
            result.push(p)
        }
        Ok(result)
    }
}