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use crate::models::{CargoCrate, Crate, CrateId};
use std::collections::{BTreeMap, BTreeSet};
use std::path::PathBuf;

/// Dependency graph in a workspace
pub struct DepGraph {
    /// Mapping of crates in the workspace
    members: BTreeMap<CrateId, Crate>,
    /// Map of crates and the members that depend on them
    dependents: BTreeMap<CrateId, BTreeSet<CrateId>>,
}

impl DepGraph {
    /// Create a new, empty dependency graph
    pub fn new() -> Self {
        Self {
            members: Default::default(),
            dependents: Default::default(),
        }
    }

    pub fn add_crate(&mut self, cc: CargoCrate) {
        let cc = Crate::new(cc);
        self.members.insert(cc.id, cc);
    }

    /// Cache the dependents graph for all crates
    pub fn finalise(&mut self) {
        let mut members = self.members.clone();
        members.iter_mut().for_each(|(_, c)| c.process(&self));

        members.iter().for_each(|(id, _crate)| {
            _crate.dependencies.iter().for_each(|dep_id| {
                self.dependents.entry(*dep_id).or_default().insert(*id);
            });
        });
        let _ = std::mem::replace(&mut self.members, members);
    }

    /// Get a crate by ID
    pub fn get_crate(&self, id: CrateId) -> &Crate {
        self.members.get(&id).as_ref().unwrap()
    }

    /// Get mutable access to a crate by ID
    pub fn mut_crate(&mut self, id: CrateId) -> &mut Crate {
        self.members.get_mut(&id).unwrap()
    }

    /// Find a crate via it's name
    pub fn find_crate(&self, name: &String) -> Option<CrateId> {
        self.members
            .iter()
            .find(|(_, c)| c.name() == name)
            .map(|(id, _)| *id)
    }

    /// Find a crate by it's path-offset in the workspace
    pub fn find_crate_by_path(&self, name: &String) -> Option<CrateId> {
        self.members
            .iter()
            .find(|(_, c)| c.path() == &PathBuf::new().join(name))
            .map(|(id, _)| *id)
    }

    /// Get a crate's dependents
    pub fn get_dependents(&self, id: CrateId) -> Vec<CrateId> {
        self.dependents
            .get(&id)
            .as_ref()
            .map(|set| set.iter().cloned().collect())
            .unwrap_or(vec![])
    }

    pub fn get_all(&self) -> Vec<&Crate> {
        self.members.iter().map(|(_, c)| c).collect()
    }
}