use rustc_errors::{Diag, DiagCtxt, Diagnostic, EmissionGuarantee, Level};
use rustc_macros::{Diagnostic, Subdiagnostic};
use rustc_span::Span;

use crate::fluent_generated as fluent;

#[derive(Diagnostic)]
#[diag(codegen_gcc_unknown_ctarget_feature_prefix)]
#[note]
pub(crate) struct UnknownCTargetFeaturePrefix<'a> {
    pub feature: &'a str,
}

#[derive(Diagnostic)]
#[diag(codegen_gcc_unknown_ctarget_feature)]
#[note]
pub(crate) struct UnknownCTargetFeature<'a> {
    pub feature: &'a str,
    #[subdiagnostic]
    pub rust_feature: PossibleFeature<'a>,
}

#[derive(Subdiagnostic)]
pub(crate) enum PossibleFeature<'a> {
    #[help(codegen_gcc_possible_feature)]
    Some { rust_feature: &'a str },
    #[help(codegen_gcc_consider_filing_feature_request)]
    None,
}

#[derive(Diagnostic)]
#[diag(codegen_gcc_lto_not_supported)]
pub(crate) struct LTONotSupported;

#[derive(Diagnostic)]
#[diag(codegen_gcc_unwinding_inline_asm)]
pub(crate) struct UnwindingInlineAsm {
    #[primary_span]
    pub span: Span,
}

#[derive(Diagnostic)]
#[diag(codegen_gcc_invalid_minimum_alignment)]
pub(crate) struct InvalidMinimumAlignment {
    pub err: String,
}

#[derive(Diagnostic)]
#[diag(codegen_gcc_tied_target_features)]
#[help]
pub(crate) struct TiedTargetFeatures {
    #[primary_span]
    pub span: Span,
    pub features: String,
}

#[derive(Diagnostic)]
#[diag(codegen_gcc_copy_bitcode)]
pub(crate) struct CopyBitcode {
    pub err: std::io::Error,
}

#[derive(Diagnostic)]
#[diag(codegen_gcc_dynamic_linking_with_lto)]
#[note]
pub(crate) struct DynamicLinkingWithLTO;

#[derive(Diagnostic)]
#[diag(codegen_gcc_lto_disallowed)]
pub(crate) struct LtoDisallowed;

#[derive(Diagnostic)]
#[diag(codegen_gcc_lto_dylib)]
pub(crate) struct LtoDylib;

#[derive(Diagnostic)]
#[diag(codegen_gcc_lto_bitcode_from_rlib)]
pub(crate) struct LtoBitcodeFromRlib {
    pub gcc_err: String,
}

pub(crate) struct TargetFeatureDisableOrEnable<'a> {
    pub features: &'a [&'a str],
    pub span: Option<Span>,
    pub missing_features: Option<MissingFeatures>,
}

#[derive(Subdiagnostic)]
#[help(codegen_gcc_missing_features)]
pub(crate) struct MissingFeatures;

impl<G: EmissionGuarantee> Diagnostic<'_, G> for TargetFeatureDisableOrEnable<'_> {
    fn into_diag(self, dcx: &'_ DiagCtxt, level: Level) -> Diag<'_, G> {
        let mut diag = Diag::new(dcx, level, fluent::codegen_gcc_target_feature_disable_or_enable);
        if let Some(span) = self.span {
            diag.span(span);
        };
        if let Some(missing_features) = self.missing_features {
            diag.subdiagnostic(dcx, missing_features);
        }
        diag.arg("features", self.features.join(", "));
        diag
    }
}