use anyhow::Result;

use crate::{ImageSpec, Stage};

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct BuildPlan {
    spec: ImageSpec,
}

impl BuildPlan {
    pub fn compile(spec: ImageSpec) -> Result<Self> {
        spec.validate()?;
        Ok(Self { spec })
    }

    pub fn spec(&self) -> &ImageSpec {
        &self.spec
    }

    pub fn stages(&self) -> &'static [Stage] {
        &Stage::ORDERED
    }

    pub fn dependencies(&self, stage: Stage) -> &'static [Stage] {
        stage.dependencies()
    }
}