use crate::records::module::Module;
use crate::type_aliases::scope_ptr_module::ScopePtr;
use luaur_ast::records::location::Location;
use luaur_ast::records::position::Position;

/// `ScopePtr findScopeAtPosition(const Module& module, Position pos)`.
/// Reference: `AstQuery.cpp`. `ScopePtr = shared_ptr<Scope>` (nullable) -> `Option<ScopePtr>`.
pub fn find_scope_at_position(module: &Module, pos: Position) -> Option<ScopePtr> {
    if module.scopes.is_empty() {
        return None;
    }

    let mut scope_location = module.scopes[0].0;
    let mut scope: Option<ScopePtr> = Some(module.scopes[0].1.clone());

    for &(loc, ref s) in &module.scopes {
        if loc.contains(pos) {
            if scope.is_none() || scope_location.encloses(&loc) {
                scope_location = loc;
                scope = Some(s.clone());
            }
        }
    }

    scope
}
