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use rowan::{GreenToken, SyntaxKind};

use crate::{ast, ast::AstNode, SyntaxNode, TokenText};

impl ast::Name {
    pub fn text(&self) -> TokenText {
        text_of_first_token(self.syntax())
    }
}

impl ast::Variable {
    pub fn text(&self) -> TokenText {
        self.name()
            .expect("Cannot get variable's NAME token")
            .text()
    }
}

impl ast::EnumValue {
    pub fn text(&self) -> TokenText {
        self.name()
            .expect("Cannot get enum value's NAME token")
            .text()
    }
}

impl ast::DirectiveLocation {
    pub fn text(self) -> Option<TokenText> {
        let txt = if self.query_token().is_some() {
            Some("QUERY")
        } else if self.mutation_token().is_some() {
            Some("MUTATION")
        } else if self.subscription_token().is_some() {
            Some("SUBSCRIPTION")
        } else if self.field_token().is_some() {
            Some("FIELD")
        } else if self.fragment_definition_token().is_some() {
            Some("FRAGMENT_DEFINITION")
        } else if self.fragment_spread_token().is_some() {
            Some("FRAGMENT_SPREAD")
        } else if self.inline_fragment_token().is_some() {
            Some("INLINE_FRAGMENT")
        } else if self.variable_definition_token().is_some() {
            Some("VARIABLE_DEFINITION")
        } else if self.schema_token().is_some() {
            Some("SCHEMA")
        } else if self.scalar_token().is_some() {
            Some("SCALAR")
        } else if self.object_token().is_some() {
            Some("OBJECT")
        } else if self.field_definition_token().is_some() {
            Some("FIELD_DEFINITION")
        } else if self.argument_definition_token().is_some() {
            Some("ARGUMENT_DEFINITION")
        } else if self.interface_token().is_some() {
            Some("INTERFACE")
        } else if self.union_token().is_some() {
            Some("UNION")
        } else if self.enum_token().is_some() {
            Some("ENUM")
        } else if self.enum_value_token().is_some() {
            Some("ENUM_VALUE")
        } else if self.input_object_token().is_some() {
            Some("INPUT_OBJECT")
        } else if self.input_field_definition_token().is_some() {
            Some("INPUT_FIELD_DEFINITION")
        } else {
            None
        };

        txt.map(|txt| {
            TokenText(GreenToken::new(
                SyntaxKind(crate::SyntaxKind::DIRECTIVE_LOCATION as u16),
                txt,
            ))
        })
    }
}

impl From<ast::StringValue> for String {
    fn from(val: ast::StringValue) -> Self {
        Self::from(&val)
    }
}

impl From<&'_ ast::StringValue> for String {
    fn from(val: &'_ ast::StringValue) -> Self {
        let text = text_of_first_token(val.syntax());
        text.trim_start_matches('"')
            .trim_end_matches('"')
            .to_string()
    }
}

impl From<ast::IntValue> for i32 {
    fn from(val: ast::IntValue) -> Self {
        Self::from(&val)
    }
}

impl From<&'_ ast::IntValue> for i32 {
    fn from(val: &'_ ast::IntValue) -> Self {
        let text = text_of_first_token(val.syntax());
        text.parse().expect("Cannot parse IntValue")
    }
}

impl From<ast::FloatValue> for f64 {
    fn from(val: ast::FloatValue) -> Self {
        Self::from(&val)
    }
}

impl From<&'_ ast::FloatValue> for f64 {
    fn from(val: &'_ ast::FloatValue) -> Self {
        let text = text_of_first_token(val.syntax());
        text.parse().expect("Cannot parse FloatValue")
    }
}

impl From<ast::BooleanValue> for bool {
    fn from(val: ast::BooleanValue) -> Self {
        Self::from(&val)
    }
}

impl From<&'_ ast::BooleanValue> for bool {
    fn from(val: &'_ ast::BooleanValue) -> Self {
        let text = text_of_first_token(val.syntax());
        text.parse().expect("Cannot parse BooleanValue")
    }
}

fn text_of_first_token(node: &SyntaxNode) -> TokenText {
    let first_token = node
        .green()
        .children()
        .next()
        .and_then(|it| it.into_token())
        .unwrap()
        .to_owned();

    TokenText(first_token)
}