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use std::collections::TryReserveError;
use anyhow::anyhow;
use std::fmt::{Debug, Display, Formatter};
use dochy_compaction::kval_enum::KVal;

pub type DiffResult<T> = std::result::Result<T, DiffError>;

pub(crate) trait OptToErr{
    fn ast_i64(&self) -> Result<i64, &'static str>;
    fn ast_bool(&self) -> Result<bool, &'static str>;
    fn ast_f64(&self) -> Result<f64, &'static str>;
    fn ast_string(&self) -> Result<String, &'static str>;
}

impl OptToErr for KVal{
    fn ast_i64(&self) -> Result<i64, &'static str> {
        self.as_i64().ok_or("The value is not i64")
    }
    fn ast_bool(&self) -> Result<bool, &'static str> {
        self.as_bool().ok_or("The value is not bool")
    }
    fn ast_f64(&self) -> Result<f64, &'static str> {
        self.as_f64().ok_or("The value is not f64")
    }
    fn ast_string(&self) -> Result<String, &'static str> {
        self.as_string().ok_or("The value is not string")
    }
}

///The error type of dochy_diff
pub struct DiffError {
    e : anyhow::Error
}
impl DiffError{
    pub fn new(e : impl Into<anyhow::Error>) -> Self{ Self{ e : e.into() } }
}

impl Display for DiffError{
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        Display::fmt(&self.e, f)
    }
}

impl Debug for DiffError{
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        Debug::fmt(&self.e, f)
    }
}

impl Into<anyhow::Error> for DiffError {
    fn into(self) -> anyhow::Error { self.e }
}


impl From<anyhow::Error> for DiffError{
    fn from(e: anyhow::Error) -> Self {
        Self::new(e)
    }
}

impl From<TryReserveError> for DiffError{
    fn from(e: TryReserveError) -> Self { DiffError::new(e) }
}

impl From<&str> for DiffError{
    fn from(e: &str) -> Self {
        Self::new(anyhow!("{}", e))
    }
}

impl From<String> for DiffError{
    fn from(e: String) -> Self {
        Self::new(anyhow!("{}", e))
    }
}