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use crate::{BoxError, ErrReport, Result, RootCauseFirst};
use eyre_impl::{ErrorContext, IntoErrorReporter};
use std::fmt;

impl RootCauseFirst {
    pub fn note(&mut self, context: impl ContextObj) {
        self.push(ContextObject::Note(Box::new(context)));
    }

    pub fn warn(&mut self, context: impl ContextObj) {
        self.push(ContextObject::Warn(Box::new(context)));
    }
}

impl ErrorContext<ContextObject> for RootCauseFirst {
    fn push(&mut self, context: ContextObject) {
        self.context.push(context);
    }
}

impl Default for RootCauseFirst {
    fn default() -> Self {
        Self {
            context: Vec::new(),
            backtrace: std::backtrace::Backtrace::capture(),
            // span_backtrace: tracing_error::SpanTrace::capture(),
        }
    }
}

pub trait ContextObj: fmt::Display + Send + Sync + 'static {}

impl<T> ContextObj for T where T: fmt::Display + Send + Sync + 'static {}

pub trait ContextExt<T, E>: private::Sealed {
    /// Wrap the error value with additional context.
    fn note<C>(self, context: C) -> Result<T>
    where
        C: ContextObj;

    /// Wrap the error value with additional context that is evaluated lazily
    /// only once an error does occur.
    fn with_note<C, F>(self, f: F) -> Result<T>
    where
        C: ContextObj,
        F: FnOnce() -> C;
}

impl<T, E> ContextExt<T, E> for std::result::Result<T, E>
where
    E: eyre_impl::IntoErrorReporter<BoxError, RootCauseFirst, ContextObject>
        + Send
        + Sync
        + 'static,
{
    fn note<C>(self, context: C) -> Result<T>
    where
        C: fmt::Display + Send + Sync + 'static,
    {
        self.map_err(|error| {
            ErrReport::new(error.ext_context(ContextObject::Note(Box::new(context))))
        })
    }

    fn with_note<C, F>(self, context: F) -> Result<T>
    where
        C: fmt::Display + Send + Sync + 'static,
        F: FnOnce() -> C,
    {
        self.map_err(|error| {
            ErrReport::new(error.ext_context(ContextObject::Note(Box::new(context()))))
        })
    }
}

impl IntoErrorReporter<BoxError, RootCauseFirst, ContextObject> for crate::ErrReport {
    fn ext_context(
        mut self,
        context: ContextObject,
    ) -> eyre_impl::ErrorReporter<BoxError, RootCauseFirst> {
        self.0.context.push(context);
        *self.0
    }
}

pub enum ContextObject {
    Note(Box<dyn ContextObj>),
    Warn(Box<dyn ContextObj>),
}

impl fmt::Display for ContextObject {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            Self::Note(context) => write!(f, "Note: {}", context),
            Self::Warn(context) => write!(f, "Warn: {}", context),
        }
    }
}

pub(crate) mod private {
    use super::*;

    pub trait Sealed {}

    impl<T, E> Sealed for std::result::Result<T, E> where
        E: eyre_impl::IntoErrorReporter<BoxError, RootCauseFirst, ContextObject>
    {
    }
}