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use crate::engine::Engine;
use crate::fn_native::Shared;
use crate::module::{Module, ModuleResolver};
use crate::result::EvalAltResult;
use crate::token::Position;

use crate::stdlib::{boxed::Box, ops::AddAssign, vec::Vec};

/// Module resolution service that holds a collection of module resolves,

/// to be searched in sequential order.

///

/// # Example

///

/// ```

/// use rhai::{Engine, Module};

/// use rhai::module_resolvers::{StaticModuleResolver, ModuleResolversCollection};

///

/// let mut collection = ModuleResolversCollection::new();

///

/// let resolver = StaticModuleResolver::new();

/// collection.push(resolver);

///

/// let mut engine = Engine::new();

/// engine.set_module_resolver(Some(collection));

/// ```

#[derive(Default)]
pub struct ModuleResolversCollection(Vec<Box<dyn ModuleResolver>>);

impl ModuleResolversCollection {
    /// Create a new `ModuleResolversCollection`.

    ///

    /// # Example

    ///

    /// ```

    /// use rhai::{Engine, Module};

    /// use rhai::module_resolvers::{StaticModuleResolver, ModuleResolversCollection};

    ///

    /// let mut collection = ModuleResolversCollection::new();

    ///

    /// let resolver = StaticModuleResolver::new();

    /// collection.push(resolver);

    ///

    /// let mut engine = Engine::new();

    /// engine.set_module_resolver(Some(collection));

    /// ```

    #[inline(always)]
    pub fn new() -> Self {
        Default::default()
    }
    /// Add a module keyed by its path.

    #[inline(always)]
    pub fn push(&mut self, resolver: impl ModuleResolver + 'static) {
        self.0.push(Box::new(resolver));
    }
    /// Get an iterator of all the module resolvers.

    #[inline(always)]
    pub fn iter(&self) -> impl Iterator<Item = &dyn ModuleResolver> {
        self.0.iter().map(|v| v.as_ref())
    }
    /// Get a mutable iterator of all the modules.

    #[inline(always)]
    pub fn into_iter(self) -> impl Iterator<Item = Box<dyn ModuleResolver>> {
        self.0.into_iter()
    }
    /// Remove all module resolvers.

    #[inline(always)]
    pub fn clear(&mut self) {
        self.0.clear();
    }
    /// Is this `ModuleResolversCollection` empty?

    #[inline(always)]
    pub fn is_empty(&self) -> bool {
        self.0.is_empty()
    }
    /// Get the number of module resolvers in this `ModuleResolversCollection`.

    #[inline(always)]
    pub fn len(&self) -> usize {
        self.0.len()
    }
    /// Add another `ModuleResolversCollection` to the end of this collection.

    /// The other `ModuleResolversCollection` is consumed.

    #[inline(always)]
    pub fn append(&mut self, other: Self) {
        self.0.extend(other.0.into_iter());
    }
}

impl ModuleResolver for ModuleResolversCollection {
    fn resolve(
        &self,
        engine: &Engine,
        path: &str,
        pos: Position,
    ) -> Result<Shared<Module>, Box<EvalAltResult>> {
        for resolver in self.0.iter() {
            match resolver.resolve(engine, path, pos) {
                Ok(module) => return Ok(module),
                Err(err) => match *err {
                    EvalAltResult::ErrorModuleNotFound(_, _) => continue,
                    EvalAltResult::ErrorInModule(_, err, _) => return Err(err),
                    _ => panic!("ModuleResolver::resolve returns error that is not ErrorModuleNotFound or ErrorInModule"),
                },
            }
        }

        EvalAltResult::ErrorModuleNotFound(path.into(), pos).into()
    }
}

impl<M: ModuleResolver + 'static> AddAssign<M> for ModuleResolversCollection {
    #[inline(always)]
    fn add_assign(&mut self, rhs: M) {
        self.push(rhs);
    }
}