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    use super::{
    	invoke::{Invoke, Identity},
    	misc::ValueTypeBuilder,
    };

    use crate::elements;

    /// Global builder
    pub struct GlobalBuilder<F=Identity> {
    	callback: F,
    	value_type: elements::ValueType,
    	is_mutable: bool,
    	init_expr: elements::InitExpr,
    }

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

    impl<F> GlobalBuilder<F> {
    	/// New global builder with callback (in chained context)
    	pub fn with_callback(callback: F) -> Self {
    		GlobalBuilder {
    			callback: callback,
    			value_type: elements::ValueType::I32,
    			init_expr: elements::InitExpr::empty(),
    			is_mutable: false,
    		}
    	}

    	/// Set/override resulting global type
    	pub fn with_type(mut self, value_type: elements::ValueType) -> Self {
    		self.value_type = value_type;
    		self
    	}

    	/// Set mutabilty to true
    	pub fn mutable(mut self) -> Self {
    		self.is_mutable = true;
    		self
    	}

    	/// Set initialization expression instruction for this global (`end` instruction will be added automatically)
    	pub fn init_expr(mut self, instruction: elements::Instruction) -> Self {
    		self.init_expr = elements::InitExpr::new(vec![instruction, elements::Instruction::End]);
    		self
    	}

    	/// Start value type builder
    	pub fn value_type(self) -> ValueTypeBuilder<Self> {
    		ValueTypeBuilder::with_callback(self)
    	}
    }

    impl<F> GlobalBuilder<F> where F: Invoke<elements::GlobalEntry> {
    	/// Finalize current builder spawning resulting struct
    	pub fn build(self) -> F::Result {
    		self.callback.invoke(
    			elements::GlobalEntry::new(
    				elements::GlobalType::new(self.value_type, self.is_mutable),
    				self.init_expr,
    			)
    		)
    	}
    }

    impl<F> Invoke<elements::ValueType> for GlobalBuilder<F> {
    	type Result = Self;
    	fn invoke(self, the_type: elements::ValueType) -> Self {
    		self.with_type(the_type)
    	}
    }

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

    #[cfg(test)]
    mod tests {
    	use super::global;
    	use crate::elements;

    	#[test]
    	fn example() {
    		let entry = global().value_type().i32().build();
    		assert_eq!(entry.global_type().content_type(), elements::ValueType::I32);
    		assert_eq!(entry.global_type().is_mutable(), false);
    	}
    }

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