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use std::{cell::RefCell, error::Error};

mod parser;

#[derive(Debug)]
pub struct Config<'a> {
    contents: RefCell<Vec<&'a str>>,
}

impl<'a> Config<'a> {
    pub fn load(contents: Vec<&'a str>) -> Config {
        Config {
            contents: RefCell::new(contents),
        }
    }

    pub fn get_config(&self) -> String {
        self.contents
            .borrow()
            .iter()
            .map(|c| c.to_string())
            .collect::<Vec<String>>()
            .join("\n")
    }

    pub fn list_contexts(&self) -> Result<String, Box<dyn Error>> {
        Ok(self
            .get_contexts()?
            .iter()
            .map(|c| c.to_string())
            .collect::<Vec<String>>()
            .join("\n"))
    }

    pub fn check_context(&self, context: &str) -> Result<bool, &'static str> {
        let contexts = self.get_contexts()?;

        Ok(contexts.iter().any(|c| *c == context))
    }

    pub fn get_current_context(&self) -> Result<&str, &'static str> {
        let contents = self.contents.borrow();
        let iter = contents.iter();

        for line in iter {
            if let Some(current_context) = parser::match_literal(line, "current-context: ") {
                return Ok(current_context);
            }
        }

        Err("current-context is not set")
    }

    pub fn set_current_context(&'a self, new_context: &'a str) -> Result<(), &'static str> {
        let mut contents = self.contents.borrow_mut();
        let iter = contents.iter();

        for (index, line) in iter.enumerate() {
            if parser::match_literal(line, "current-context:").is_some() {
                contents.push(new_context);
                contents.swap_remove(index);
                return Ok(());
            }
        }

        contents.push(new_context);

        Ok(())
    }

    pub fn unset_current_context(&'a self) -> Result<(), &'static str> {
        let mut contents = self.contents.borrow_mut();
        let iter = contents.iter();

        for (index, line) in iter.enumerate() {
            if parser::match_literal(line, "current-context:").is_some() {
                contents.remove(index);
                return Ok(());
            }
        }

        Ok(())
    }

    fn get_contexts(&self) -> Result<Vec<&str>, &'static str> {
        let mut contexts = Vec::<&str>::new();
        let contents = self.contents.borrow();
        let mut input = contents.iter().peekable();

        while let Some(line) = input.next() {
            if parser::match_literal(line, "contexts:").is_some() {
                while parser::is_in_mapping(input.peek().ok_or("Reached the end of contexts.")?)
                    .is_ok()
                {
                    if let Some(line) = input.next() {
                        if let Some(name) = parser::match_literal(line, "  name: ") {
                            contexts.push(name);
                        }
                    }
                }

                break;
            }
        }

        if contexts.is_empty() {
            return Err("Cannot get contexts!");
        }

        Ok(contexts)
    }
}