//! Re-export diagnostics such that clients of `hir` don't have to depend on
//! low-level crates.
//!
//! This probably isn't the best way to do this -- ideally, diagnistics should
//! be expressed in terms of hir types themselves.
use base_db::CrateId;
use cfg::{CfgExpr, CfgOptions};
use either::Either;
use hir_def::path::ModPath;
use hir_expand::{name::Name, HirFileId, InFile};
use syntax::{ast, AstPtr, SyntaxNodePtr, TextRange};

use crate::{MacroKind, Type};

macro_rules! diagnostics {
    ($($diag:ident,)*) => {
        pub enum AnyDiagnostic {$(
            $diag(Box<$diag>),
        )*}

        $(
            impl From<$diag> for AnyDiagnostic {
                fn from(d: $diag) -> AnyDiagnostic {
                    AnyDiagnostic::$diag(Box::new(d))
                }
            }
        )*
    };
}

diagnostics![
    BreakOutsideOfLoop,
    InactiveCode,
    IncorrectCase,
    InvalidDeriveTarget,
    MacroError,
    MalformedDerive,
    MismatchedArgCount,
    MissingFields,
    MissingMatchArms,
    MissingUnsafe,
    NoSuchField,
    ReplaceFilterMapNextWithFindMap,
    TypeMismatch,
    UnimplementedBuiltinMacro,
    UnresolvedExternCrate,
    UnresolvedImport,
    UnresolvedMacroCall,
    UnresolvedModule,
    UnresolvedProcMacro,
];

#[derive(Debug)]
pub struct UnresolvedModule {
    pub decl: InFile<AstPtr<ast::Module>>,
    pub candidates: Box<[String]>,
}

#[derive(Debug)]
pub struct UnresolvedExternCrate {
    pub decl: InFile<AstPtr<ast::ExternCrate>>,
}

#[derive(Debug)]
pub struct UnresolvedImport {
    pub decl: InFile<AstPtr<ast::UseTree>>,
}

#[derive(Debug, Clone, Eq, PartialEq)]
pub struct UnresolvedMacroCall {
    pub macro_call: InFile<SyntaxNodePtr>,
    pub path: ModPath,
    pub is_bang: bool,
}

#[derive(Debug, Clone, Eq, PartialEq)]
pub struct InactiveCode {
    pub node: InFile<SyntaxNodePtr>,
    pub cfg: CfgExpr,
    pub opts: CfgOptions,
}

#[derive(Debug, Clone, Eq, PartialEq)]
pub struct UnresolvedProcMacro {
    pub node: InFile<SyntaxNodePtr>,
    /// If the diagnostic can be pinpointed more accurately than via `node`, this is the `TextRange`
    /// to use instead.
    pub precise_location: Option<TextRange>,
    pub macro_name: Option<String>,
    pub kind: MacroKind,
    /// The crate id of the proc-macro this macro belongs to, or `None` if the proc-macro can't be found.
    pub krate: Option<CrateId>,
}

#[derive(Debug, Clone, Eq, PartialEq)]
pub struct MacroError {
    pub node: InFile<SyntaxNodePtr>,
    pub message: String,
}

#[derive(Debug)]
pub struct UnimplementedBuiltinMacro {
    pub node: InFile<SyntaxNodePtr>,
}

#[derive(Debug)]
pub struct InvalidDeriveTarget {
    pub node: InFile<SyntaxNodePtr>,
}

#[derive(Debug)]
pub struct MalformedDerive {
    pub node: InFile<SyntaxNodePtr>,
}

#[derive(Debug)]
pub struct NoSuchField {
    pub field: InFile<AstPtr<ast::RecordExprField>>,
}

#[derive(Debug)]
pub struct BreakOutsideOfLoop {
    pub expr: InFile<AstPtr<ast::Expr>>,
}

#[derive(Debug)]
pub struct MissingUnsafe {
    pub expr: InFile<AstPtr<ast::Expr>>,
}

#[derive(Debug)]
pub struct MissingFields {
    pub file: HirFileId,
    pub field_list_parent: Either<AstPtr<ast::RecordExpr>, AstPtr<ast::RecordPat>>,
    pub field_list_parent_path: Option<AstPtr<ast::Path>>,
    pub missed_fields: Vec<Name>,
}

#[derive(Debug)]
pub struct ReplaceFilterMapNextWithFindMap {
    pub file: HirFileId,
    /// This expression is the whole method chain up to and including `.filter_map(..).next()`.
    pub next_expr: AstPtr<ast::Expr>,
}

#[derive(Debug)]
pub struct MismatchedArgCount {
    pub call_expr: InFile<AstPtr<ast::Expr>>,
    pub expected: usize,
    pub found: usize,
}

#[derive(Debug)]
pub struct MissingMatchArms {
    pub file: HirFileId,
    pub match_expr: AstPtr<ast::Expr>,
}

#[derive(Debug)]
pub struct TypeMismatch {
    // FIXME: add mismatches in patterns as well
    pub expr: InFile<AstPtr<ast::Expr>>,
    pub expected: Type,
    pub actual: Type,
}

pub use hir_ty::diagnostics::IncorrectCase;