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//! See [`FamousDefs`].
use hir::{Crate, Enum, Module, ScopeDef, Semantics, Trait};

use crate::RootDatabase;

/// Helps with finding well-know things inside the standard library. This is
/// somewhat similar to the known paths infra inside hir, but it different; We
/// want to make sure that IDE specific paths don't become interesting inside
/// the compiler itself as well.
///
/// Note that, by default, rust-analyzer tests **do not** include core or std
/// libraries. If you are writing tests for functionality using [`FamousDefs`],
/// you'd want to include minicore (see `test_utils::MiniCore`) declaration at
/// the start of your tests:
///
/// ```
/// //- minicore: iterator, ord, derive
/// ```
pub struct FamousDefs<'a, 'b>(pub &'a Semantics<'b, RootDatabase>, pub Option<Crate>);

#[allow(non_snake_case)]
impl FamousDefs<'_, '_> {
    pub fn std(&self) -> Option<Crate> {
        self.find_crate("std")
    }

    pub fn core(&self) -> Option<Crate> {
        self.find_crate("core")
    }

    pub fn core_cmp_Ord(&self) -> Option<Trait> {
        self.find_trait("core:cmp:Ord")
    }

    pub fn core_convert_From(&self) -> Option<Trait> {
        self.find_trait("core:convert:From")
    }

    pub fn core_convert_Into(&self) -> Option<Trait> {
        self.find_trait("core:convert:Into")
    }

    pub fn core_option_Option(&self) -> Option<Enum> {
        self.find_enum("core:option:Option")
    }

    pub fn core_result_Result(&self) -> Option<Enum> {
        self.find_enum("core:result:Result")
    }

    pub fn core_default_Default(&self) -> Option<Trait> {
        self.find_trait("core:default:Default")
    }

    pub fn core_iter_Iterator(&self) -> Option<Trait> {
        self.find_trait("core:iter:traits:iterator:Iterator")
    }

    pub fn core_iter_IntoIterator(&self) -> Option<Trait> {
        self.find_trait("core:iter:traits:collect:IntoIterator")
    }

    pub fn core_iter(&self) -> Option<Module> {
        self.find_module("core:iter")
    }

    pub fn core_ops_Deref(&self) -> Option<Trait> {
        self.find_trait("core:ops:Deref")
    }

    fn find_trait(&self, path: &str) -> Option<Trait> {
        match self.find_def(path)? {
            hir::ScopeDef::ModuleDef(hir::ModuleDef::Trait(it)) => Some(it),
            _ => None,
        }
    }

    fn find_enum(&self, path: &str) -> Option<Enum> {
        match self.find_def(path)? {
            hir::ScopeDef::ModuleDef(hir::ModuleDef::Adt(hir::Adt::Enum(it))) => Some(it),
            _ => None,
        }
    }

    fn find_module(&self, path: &str) -> Option<Module> {
        match self.find_def(path)? {
            hir::ScopeDef::ModuleDef(hir::ModuleDef::Module(it)) => Some(it),
            _ => None,
        }
    }

    fn find_crate(&self, name: &str) -> Option<Crate> {
        let krate = self.1?;
        let db = self.0.db;
        let res =
            krate.dependencies(db).into_iter().find(|dep| dep.name.to_string() == name)?.krate;
        Some(res)
    }

    fn find_def(&self, path: &str) -> Option<ScopeDef> {
        let db = self.0.db;
        let mut path = path.split(':');
        let trait_ = path.next_back()?;
        let std_crate = path.next()?;
        let std_crate = self.find_crate(std_crate)?;
        let mut module = std_crate.root_module(db);
        for segment in path {
            module = module.children(db).find_map(|child| {
                let name = child.name(db)?;
                if name.to_string() == segment {
                    Some(child)
                } else {
                    None
                }
            })?;
        }
        let def =
            module.scope(db, None).into_iter().find(|(name, _def)| name.to_string() == trait_)?.1;
        Some(def)
    }
}