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use crate::input_value::Constness;
use crate::input_value::InputValue;
use crate::input_value::InputValueDef;
use crate::name::Name;
use crate::DocumentBuilder;
use apollo_compiler::ast;
use apollo_compiler::Node;
use arbitrary::Result as ArbitraryResult;

/// The `__ArgumentsDef` type represents an arguments definition
///
/// *ArgumentsDefinition*:
///     ( InputValueDefinition* )
///
/// Detailed documentation can be found in [GraphQL spec](https://spec.graphql.org/October2021/#ArgumentsDefinition).
///
#[derive(Debug, Clone, PartialEq)]
pub struct ArgumentsDef {
    pub(crate) input_value_definitions: Vec<InputValueDef>,
}

impl From<ArgumentsDef> for Vec<Node<ast::InputValueDefinition>> {
    fn from(args_def: ArgumentsDef) -> Self {
        args_def
            .input_value_definitions
            .into_iter()
            .map(|x| Node::new(x.into()))
            .collect()
    }
}

impl TryFrom<apollo_parser::cst::ArgumentsDefinition> for ArgumentsDef {
    type Error = crate::FromError;

    fn try_from(args_def: apollo_parser::cst::ArgumentsDefinition) -> Result<Self, Self::Error> {
        Ok(Self {
            input_value_definitions: args_def
                .input_value_definitions()
                .map(InputValueDef::try_from)
                .collect::<Result<_, _>>()?,
        })
    }
}

/// The `__Argument` type represents an argument
///
/// *Argument*:
///     Name: Value
///
/// Detailed documentation can be found in [GraphQL spec](https://spec.graphql.org/October2021/#sec-Language.Arguments).
#[derive(Debug, Clone, PartialEq)]
pub struct Argument {
    pub(crate) name: Name,
    pub(crate) value: InputValue,
}

impl From<Argument> for ast::Argument {
    fn from(arg: Argument) -> Self {
        Self {
            name: arg.name.into(),
            value: Node::new(arg.value.into()),
        }
    }
}

impl TryFrom<apollo_parser::cst::Argument> for Argument {
    type Error = crate::FromError;

    fn try_from(argument: apollo_parser::cst::Argument) -> Result<Self, Self::Error> {
        Ok(Self {
            name: argument.name().unwrap().into(),
            value: argument.value().unwrap().try_into()?,
        })
    }
}

impl<'a> DocumentBuilder<'a> {
    /// Create an arbitrary vector of `Argument`
    pub fn arguments(&mut self, constness: Constness) -> ArbitraryResult<Vec<Argument>> {
        let num_arguments = self.u.int_in_range(0..=4)?;
        let arguments = (0..num_arguments)
            .map(|_| self.argument(constness))
            .collect::<ArbitraryResult<Vec<_>>>()?;

        Ok(arguments)
    }

    /// Create an arbitrary vector of `Argument` given ArgumentsDef
    pub fn arguments_with_def(
        &mut self,
        args_def: &ArgumentsDef,
    ) -> ArbitraryResult<Vec<Argument>> {
        let arguments = args_def
            .input_value_definitions
            .iter()
            .map(|input_val_def| self.argument_with_def(input_val_def))
            .collect::<ArbitraryResult<Vec<_>>>()?;

        Ok(arguments)
    }

    /// Create an arbitrary `Argument`
    pub fn argument(&mut self, constness: Constness) -> ArbitraryResult<Argument> {
        let name = self.name()?;
        let value = self.input_value(constness)?;

        Ok(Argument { name, value })
    }

    /// Create an arbitrary `Argument`
    pub fn argument_with_def(
        &mut self,
        input_val_def: &InputValueDef,
    ) -> ArbitraryResult<Argument> {
        let name = input_val_def.name.clone();
        let value = self.input_value_for_type(&input_val_def.ty)?;

        Ok(Argument { name, value })
    }

    /// Create an arbitrary `ArgumentsDef`
    pub fn arguments_definition(&mut self) -> ArbitraryResult<ArgumentsDef> {
        Ok(ArgumentsDef {
            input_value_definitions: self.input_values_def()?,
        })
    }
}