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//! This module contains `Diagnostic` and the types/functions it uses for deserialization.

use serde::{Deserialize, Serialize};
use std::fmt;

/// The error code associated to this diagnostic.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
pub struct DiagnosticCode {
    /// The code itself.
    pub code: String,
    /// An explanation for the code
    pub explanation: Option<String>,
    #[doc(hidden)]
    #[serde(skip)]
    __do_not_match_exhaustively: (),
}

/// A line of code associated with the Diagnostic
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
pub struct DiagnosticSpanLine {
    /// The line of code associated with the error
    pub text: String,
    /// Start of the section of the line to highlight. 1-based, character offset in self.text
    pub highlight_start: usize,
    /// End of the section of the line to highlight. 1-based, character offset in self.text
    pub highlight_end: usize,
    #[doc(hidden)]
    #[serde(skip)]
    __do_not_match_exhaustively: (),
}

/// Macro expansion information associated with a diagnostic.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
pub struct DiagnosticSpanMacroExpansion {
    /// span where macro was applied to generate this code; note that
    /// this may itself derive from a macro (if
    /// `span.expansion.is_some()`)
    pub span: DiagnosticSpan,

    /// name of macro that was applied (e.g., "foo!" or "#[derive(Eq)]")
    pub macro_decl_name: String,

    /// span where macro was defined (if known)
    pub def_site_span: Option<DiagnosticSpan>,
    #[doc(hidden)]
    #[serde(skip)]
    __do_not_match_exhaustively: (),
}

/// A section of the source code associated with a Diagnostic
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
pub struct DiagnosticSpan {
    /// The file name or the macro name this diagnostic comes from.
    pub file_name: String,
    /// The byte offset in the file where this diagnostic starts from.
    pub byte_start: u32,
    /// The byte offset in the file where this diagnostic ends.
    pub byte_end: u32,
    /// 1-based. The line in the file.
    pub line_start: usize,
    /// 1-based. The line in the file.
    pub line_end: usize,
    /// 1-based, character offset.
    pub column_start: usize,
    /// 1-based, character offset.
    pub column_end: usize,
    /// Is this a "primary" span -- meaning the point, or one of the points,
    /// where the error occurred?
    ///
    /// There are rare cases where multiple spans are marked as primary,
    /// e.g. "immutable borrow occurs here" and "mutable borrow ends here" can
    /// be two separate spans both "primary". Top (parent) messages should
    /// always have at least one primary span, unless it has 0 spans. Child
    /// messages may have 0 or more primary spans.
    pub is_primary: bool,
    /// Source text from the start of line_start to the end of line_end.
    pub text: Vec<DiagnosticSpanLine>,
    /// Label that should be placed at this location (if any)
    pub label: Option<String>,
    /// If we are suggesting a replacement, this will contain text
    /// that should be sliced in atop this span.
    pub suggested_replacement: Option<String>,
    /// If the suggestion is approximate
    pub suggestion_applicability: Option<Applicability>,
    /// Macro invocations that created the code at this span, if any.
    pub expansion: Option<Box<DiagnosticSpanMacroExpansion>>,
    #[doc(hidden)]
    #[serde(skip)]
    __do_not_match_exhaustively: (),
}

/// Whether a suggestion can be safely applied.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
pub enum Applicability {
    /// The suggested replacement can be applied automatically safely
    MachineApplicable,
    /// The suggested replacement has placeholders that will need to be manually
    /// replaced.
    HasPlaceholders,
    /// The suggested replacement may be incorrect in some circumstances. Needs
    /// human review.
    MaybeIncorrect,
    /// The suggested replacement will probably not work.
    Unspecified,
    #[doc(hidden)]
    #[serde(other)]
    Unknown,
}

/// The diagnostic level
#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq, Hash)]
#[serde(rename_all = "lowercase")]
pub enum DiagnosticLevel {
    /// Internal compiler error
    #[serde(rename = "error: internal compiler error")]
    Ice,
    /// Error
    Error,
    /// Warning
    Warning,
    /// Note
    Note,
    /// Help
    Help,
    #[doc(hidden)]
    #[serde(other)]
    Unknown,
}

/// A diagnostic message generated by rustc
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
pub struct Diagnostic {
    /// The error message of this diagnostic.
    pub message: String,
    /// The associated error code for this diagnostic
    pub code: Option<DiagnosticCode>,
    /// "error: internal compiler error", "error", "warning", "note", "help"
    pub level: DiagnosticLevel,
    /// A list of source code spans this diagnostic is associated with.
    pub spans: Vec<DiagnosticSpan>,
    /// Associated diagnostic messages.
    pub children: Vec<Diagnostic>,
    /// The message as rustc would render it
    pub rendered: Option<String>,
    #[doc(hidden)]
    #[serde(skip)]
    __do_not_match_exhaustively: (),
}

impl fmt::Display for Diagnostic {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        if let Some(ref rendered) = self.rendered {
            f.write_str(rendered)?;
        } else {
            f.write_str("cargo didn't render this message")?;
        }
        Ok(())
    }
}