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use crate::ast;
use crate::parsing::{LexerMode, ResolveError, ResolveErrorKind};
use crate::shared::Description;
use crate::Spanned;
use runestick::SpannedError;

use thiserror::Error;

error! {
    /// An error raised during parsing.
    #[derive(Debug, Clone)]
    pub struct ParseError {
        kind: ParseErrorKind,
    }

    impl From<ResolveError>;
}

impl ParseError {
    /// Construct an expectation error.
    pub(crate) fn expected<A, E>(actual: A, expected: E) -> Self
    where
        A: Description + Spanned,
        E: Description,
    {
        Self::new(
            actual.span(),
            ParseErrorKind::Expected {
                actual: actual.description(),
                expected: expected.description(),
            },
        )
    }

    /// Construct an unsupported error.
    pub(crate) fn unsupported<T, E>(actual: T, what: E) -> Self
    where
        T: Spanned,
        E: Description,
    {
        Self::new(
            actual.span(),
            ParseErrorKind::Unsupported {
                what: what.description(),
            },
        )
    }
}

impl From<ParseError> for SpannedError {
    fn from(error: ParseError) -> Self {
        SpannedError::new(error.span, *error.kind)
    }
}

/// Error when parsing.
#[derive(Debug, Clone, Copy, Error)]
#[allow(missing_docs)]
pub enum ParseErrorKind {
    #[error("{message}")]
    Custom { message: &'static str },
    #[error("{error}")]
    ResolveError { error: ResolveErrorKind },
    #[error("expected end of file, but got `{actual}`")]
    ExpectedEof { actual: ast::Kind },
    #[error("unexpected end of file")]
    UnexpectedEof,
    #[error("bad lexer mode `{actual}`, expected `{expected}`")]
    BadLexerMode {
        actual: LexerMode,
        expected: LexerMode,
    },
    #[error("expected {expected}, but got `{actual}`")]
    Expected {
        actual: &'static str,
        expected: &'static str,
    },
    #[error("{what} is not supported")]
    Unsupported { what: &'static str },
    #[error("expected escape sequence")]
    ExpectedEscape,
    #[error("unterminated string literal")]
    UnterminatedStrLit,
    #[error("unterminated byte string literal")]
    UnterminatedByteStrLit,
    #[error("unterminated character literal")]
    UnterminatedCharLit,
    #[error("unterminated byte literal")]
    UnterminatedByteLit,
    #[error("expected character literal to be closed")]
    ExpectedCharClose,
    #[error("expected label or character")]
    ExpectedCharOrLabel,
    #[error("expected byte literal to be closed")]
    ExpectedByteClose,
    #[error("unexpected character `{c}`")]
    UnexpectedChar { c: char },
    #[error("group required in expression to determine precedence")]
    PrecedenceGroupRequired,
    #[error("number literal out of bounds `-9223372036854775808` to `9223372036854775807`")]
    BadNumberOutOfBounds,
    #[error("unsupported field access")]
    BadFieldAccess,
    #[error("expected close delimiter `{expected}`, but got `{actual}`")]
    ExpectedMacroCloseDelimiter {
        expected: ast::Kind,
        actual: ast::Kind,
    },
    #[error("bad number literal")]
    BadNumber,
    #[error("can only specify one attribute named `{name}`")]
    MultipleMatchingAttributes { name: &'static str },
}