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    use crate::rust::{string::String, borrow::ToOwned};
    use super::invoke::{Invoke, Identity};
    use crate::elements;

    /// Export entry builder
    pub struct ExportBuilder<F=Identity> {
    	callback: F,
    	field: String,
    	binding: elements::Internal,
    }

    impl ExportBuilder {
    	/// New export builder
    	pub fn new() -> Self {
    		ExportBuilder::with_callback(Identity)
    	}
    }

    impl<F> ExportBuilder<F> {

    	/// New export entry builder in the specified chained context
    	pub fn with_callback(callback: F) -> Self {
    		ExportBuilder {
    			callback: callback,
    			field: String::new(),
    			binding: elements::Internal::Function(0),
    		}
    	}

    	/// Set the field name of the export entry
    	pub fn field(mut self, field: &str) -> Self {
    		self.field = field.to_owned();
    		self
    	}

    	/// Specify the internal module mapping for this entry
    	pub fn with_internal(mut self, external: elements::Internal) -> Self {
    		self.binding = external;
    		self
    	}

    	/// Start the internal builder for this export entry
    	pub fn internal(self) -> ExportInternalBuilder<Self> {
    		ExportInternalBuilder::with_callback(self)
    	}
    }

    impl<F> ExportBuilder<F> where F: Invoke<elements::ExportEntry> {
    	/// Finalize export entry builder spawning the resulting struct
    	pub fn build(self) -> F::Result {
    		self.callback.invoke(elements::ExportEntry::new(self.field, self.binding))
    	}
    }

    impl<F> Invoke<elements::Internal> for ExportBuilder<F> {
    	type Result = Self;
    	fn invoke(self, val: elements::Internal) -> Self {
    		self.with_internal(val)
    	}
    }

    /// Internal mapping builder for export entry
    pub struct ExportInternalBuilder<F=Identity> {
    	callback: F,
    	binding: elements::Internal,
    }

    impl<F> ExportInternalBuilder<F> where F: Invoke<elements::Internal> {
    	/// New export entry internal mapping for the chained context
    	pub fn with_callback(callback: F) -> Self {
    		ExportInternalBuilder{
    			callback: callback,
    			binding: elements::Internal::Function(0),
    		}
    	}

    	/// Map to function by index
    	pub fn func(mut self, index: u32) -> F::Result {
    		self.binding = elements::Internal::Function(index);
    		self.callback.invoke(self.binding)
    	}

    	/// Map to memory
    	pub fn memory(mut self, index: u32) -> F::Result {
    		self.binding = elements::Internal::Memory(index);
    		self.callback.invoke(self.binding)
    	}

    	/// Map to table
    	pub fn table(mut self, index: u32) -> F::Result {
    		self.binding = elements::Internal::Table(index);
    		self.callback.invoke(self.binding)
    	}

    	/// Map to global
    	pub fn global(mut self, index: u32) -> F::Result {
    		self.binding = elements::Internal::Global(index);
    		self.callback.invoke(self.binding)
    	}
    }

    /// New builder for export entry
    pub fn export() -> ExportBuilder {
    	ExportBuilder::new()
    }

    #[cfg(test)]
    mod tests {
    	use super::export;

    	#[test]
    	fn example() {
    		let entry = export().field("memory").internal().memory(0).build();
    		assert_eq!(entry.field(), "memory");
    	}
    }

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