use serde::Serialize;

use super::*;

#[derive(Debug, Clone, Serialize)]
pub enum Expression {
    Literal(Literal),
    Path(ExprPath),
    Statement(Box<Statement>),
    Array(Vec<Expression>),
    ArrayRepeat(Box<Expression>, Box<Expression>),
    Closure {
        return_type: Option<TypeExpr>,
        params: Vec<VarDecl>,
        body: Box<Expression>,
    },
    Fix {
        initial: Box<Expression>,
        prefixes: Vec<Prefix>,
        postfixes: Vec<Postfix>,
    },
    Binary {
        lhs: Box<Expression>,
        op: String,
        rhs: Box<Expression>,
    },
}

#[derive(Debug, Clone, Serialize)]
pub enum Literal {
    String(String),
    Int(i64),
    Float(f64),
    Bool(bool),
    Tuple(Vec<Expression>),
}

#[derive(Debug, Clone, Serialize)]
pub enum Pattern {
    NamedTuple(Path, Vec<Box<Pattern>>),
    Struct(Path, Vec<Option<(Identifier, Option<Box<Pattern>>)>>),
    Tuple(Vec<Box<Pattern>>),
    Literal(Literal),
    Path(bool, Path),
    Etc,
}

#[derive(Debug, Clone, Serialize)]
pub enum MacroDelimiter {
    Paren,
    Bracket,
    Brace,
}

#[derive(Debug, Clone, Serialize)]
pub enum Postfix {
    FieldAccess(Identifier, Option<Generics>),
    TupleFieldAccess(u8, Option<Generics>),
    Call(Vec<Expression>),
    MacroCall {
        inner: String,
        delimiter: MacroDelimiter,
    },
    StructCall(Vec<(Identifier, Option<Expression>)>),
    Assign(String, Box<Expression>),
    Index(Expression),
    As(TypeExpr),
    Increment,
    Decrement,
    Try,
}

#[derive(Debug, Clone, Serialize)]
pub enum Prefix {
    Ref,
    RefMut,
    Deref,
    Not,
    Neg,
}

#[derive(Debug, Clone, Serialize, PartialEq, Eq, Hash)]
pub struct ExprPathSegment {
    pub ident: Identifier,
    pub generics: Option<Generics>,
}

#[derive(Debug, Clone, Serialize, PartialEq, Eq, Hash)]
pub struct ExprPath(pub Vec<ExprPathSegment>);

#[derive(Debug, Clone, Serialize, PartialEq, Eq, Hash)]
pub struct Generics(pub Vec<Generic>);

#[derive(Debug, Clone, Serialize, PartialEq, Eq, Hash)]
pub enum Generic {
    Lifetime(Identifier),
    Type(TypeExpr),
}

impl Expression {
    pub fn is_block(&self) -> bool {
        if let Expression::Statement(stmt) = self {
            stmt.is_block()
        } else {
            false
        }
    }
}

impl From<Path> for ExprPath {
    fn from(path: Path) -> Self {
        Self(
            path.0
                .into_iter()
                .map(|v| ExprPathSegment {
                    ident: v,
                    generics: None,
                })
                .collect(),
        )
    }
}