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use std::collections::BTreeMap;
use std::fmt::{Display, Write};

#[derive(Debug, PartialEq, Default)]
pub struct Writter {
    inner: String,
}

impl Writter {
    pub fn new() -> Self {
        Default::default()
    }

    pub fn newline(&mut self) {
        self.inner.push('\n')
    }

    pub fn variable(&mut self, key: &str, value: &str) {
        self.vari(key, value, 0);
    }

    pub fn pool(&mut self, name: &str, depth: u32) {
        writeln!(self.inner, "pool {}", name).unwrap();
        self.vari("depth", depth, 1)
    }

    pub fn include(&mut self, path: &str) {
        writeln!(self.inner, "include {}", path).unwrap();
    }

    pub fn done(self) -> String {
        self.inner
    }

    pub fn subninja(&mut self, path: &str) {
        writeln!(self.inner, "subninja {}", path).unwrap();
    }

    pub fn default(&mut self, paths: &[&str]) {
        writeln!(self.inner, "default {}", paths.join(" ")).unwrap()
    }

    pub fn rule(&mut self, r: impl Into<Rule>) {
        macro_rules! write_if {
            ($name:expr, $val: expr) => {
                if let Some(s) = $val {
                    self.vari($name, s, 1)
                }
            };
        }

        let r: Rule = r.into();
        writeln!(self.inner, "rule {}", r.name).unwrap();
        self.vari("command", r.command, 1);

        write_if!("description", r.description);
        write_if!("depfile", r.depfile);
        if r.generator {
            self.vari("generator", "1", 1);
        }
        write_if!("pool", r.pool);
        if r.restat {
            self.vari("restat", "1", 1);
        }
        write_if!("rspfile", r.rspfile);
        write_if!("rspfile_content", r.rspfile_content);
        write_if!("deps", r.deps);
    }

    pub fn build(&mut self, b: impl Into<Build>) {
        let b = b.into();
        assert!(!b.outputs.is_empty());
        assert!(!b.rule.is_empty());
        let outs = b.outputs.join(" ");
        let ins = b.inputs.join(" ");

        writeln!(self.inner, "build {}: {} {}", outs, b.rule, ins).unwrap();

        if let Some(p) = b.pool {
            self.vari("pool", p, 1);
        }
        for (k, v) in b.variables {
            self.vari(k, v, 1);
        }
    }

    fn vari(&mut self, key: impl Display, value: impl Display, indent: usize) {
        writeln!(self.inner, "{}{} = {}", "  ".repeat(indent), key, value).unwrap();
    }
}

#[derive(Debug, PartialEq, Default)]
#[non_exhaustive]
pub struct Rule {
    pub name: String,
    pub command: String,
    pub description: Option<String>,
    pub depfile: Option<String>,
    pub generator: bool,
    pub pool: Option<String>,
    pub restat: bool,
    pub rspfile: Option<String>,
    pub rspfile_content: Option<String>,
    pub deps: Option<String>,
}

#[derive(Debug, PartialEq, Default)]
#[non_exhaustive]
pub struct Build {
    pub outputs: Vec<String>,
    pub rule: String,
    pub inputs: Vec<String>,
    pub variables: BTreeMap<String, String>,
    pub pool: Option<String>,
}

impl<X, Y> Into<Rule> for (X, Y)
where
    X: Into<String>,
    Y: Into<String>,
{
    fn into(self) -> Rule {
        let (name, command) = self;
        let name = name.into();
        let command = command.into();
        Rule {
            name,
            command,
            ..Default::default()
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use literally::bmap;
    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
    }

    fn test(c: impl Fn(&mut Writter)) {
        let mut n = Writter::new();
        c(&mut n);
        insta::assert_snapshot!(n.done());
    }

    #[test]
    fn basic() {
        test(|n| {
            n.variable("key", "value");
            n.newline();
            n.pool("pool", 5);
            n.include("foo.ninja");
            n.subninja("bax.ninja");
        })
    }

    #[test]
    fn build() {
        test(|n| {
            n.build(Build {
                outputs: vec!["out".to_owned()],
                rule: "cc".to_owned(),
                inputs: vec!["in".to_owned()],
                variables: bmap! {
                    "name".to_owned() => "value".to_owned()
                },
                ..Default::default()
            })
        })
    }
}