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use alloc::fmt;

use core::fmt::Display;

use rustpython_compiler_core::SourceLocation;

use thiserror::Error;

#[derive(Clone, Copy, Debug)]

pub enum PatternUnreachableReason {

NameCapture,

Wildcard,

}

impl Display for PatternUnreachableReason {

fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

match self {

Self::NameCapture => write!(f, "name capture"),

Self::Wildcard => write!(f, "wildcard"),

}

// pub type CodegenError = rustpython_parser_core::source_code::LocatedError<CodegenErrorType>;

#[derive(Error, Debug)]

pub struct CodegenError {

pub location: Option<SourceLocation>,

#[source]

pub error: CodegenErrorType,

pub source_path: String,

}

impl fmt::Display for CodegenError {

fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

// TODO:

self.error.fmt(f)

}

#[derive(Debug)]

#[non_exhaustive]

pub enum InternalError {

StackOverflow,

StackUnderflow,

MissingSymbol(String),

}

impl Display for InternalError {

fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

match self {

Self::StackOverflow => write!(f, "stack overflow"),

Self::StackUnderflow => write!(f, "stack underflow"),

Self::MissingSymbol(s) => write!(

"The symbol '{s}' must be present in the symbol table, even when it is undefined in python."

}

#[derive(Debug)]

#[non_exhaustive]

pub enum CodegenErrorType {

/// Invalid assignment, cannot store value in target.

Assign(&'static str),

/// Invalid delete

Delete(&'static str),

SyntaxError(String),

/// Multiple `*` detected

MultipleStarArgs,

/// Misplaced `*` expression

InvalidStarExpr,

/// Break statement outside of loop.

InvalidBreak,

/// Continue statement outside of loop.

InvalidContinue,

InvalidReturn,

InvalidYield,

InvalidYieldFrom,

InvalidAwait,

InvalidAsyncFor,

InvalidAsyncWith,

InvalidAsyncComprehension,

AsyncYieldFrom,

AsyncReturnValue,

InvalidFuturePlacement,

InvalidFutureFeature(String),

FunctionImportStar,

TooManyStarUnpack,

EmptyWithItems,

EmptyWithBody,

ForbiddenName,

DuplicateStore(String),

UnreachablePattern(PatternUnreachableReason),

RepeatedAttributePattern,

ConflictingNameBindPattern,

/// break/continue/return inside except* block

BreakContinueReturnInExceptStar,

NotImplementedYet, // RustPython marker for unimplemented features

}

impl core::error::Error for CodegenErrorType {}

impl fmt::Display for CodegenErrorType {

fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

use CodegenErrorType::*;

match self {

Assign(target) => write!(f, "cannot assign to {target}"),

Delete(target) => write!(f, "cannot delete {target}"),

SyntaxError(err) => write!(f, "{}", err.as_str()),

MultipleStarArgs => {

write!(f, "multiple starred expressions in assignment")

}

InvalidStarExpr => write!(f, "can't use starred expression here"),

InvalidBreak => write!(f, "'break' outside loop"),

InvalidContinue => write!(f, "'continue' outside loop"),

InvalidReturn => write!(f, "'return' outside function"),

InvalidYield => write!(f, "'yield' outside function"),

InvalidYieldFrom => write!(f, "'yield from' outside function"),

InvalidAwait => write!(f, "'await' outside async function"),

InvalidAsyncFor => write!(f, "'async for' outside async function"),

InvalidAsyncWith => write!(f, "'async with' outside async function"),

InvalidAsyncComprehension => {

write!(

"asynchronous comprehension outside of an asynchronous function"

)

}

AsyncYieldFrom => write!(f, "'yield from' inside async function"),

AsyncReturnValue => {

write!(f, "'return' with value inside async generator")

}

InvalidFuturePlacement => write!(

"from __future__ imports must occur at the beginning of the file"

InvalidFutureFeature(feat) => {

write!(f, "future feature {feat} is not defined")

}

FunctionImportStar => {

write!(f, "import * only allowed at module level")

}

TooManyStarUnpack => {

write!(f, "too many expressions in star-unpacking assignment")

}

EmptyWithItems => {

write!(f, "empty items on With")

}

EmptyWithBody => {

write!(f, "empty body on With")

}

ForbiddenName => {

write!(f, "forbidden attribute name")

}

DuplicateStore(s) => {

write!(f, "duplicate store {s}")

}

UnreachablePattern(reason) => {

write!(f, "{reason} makes remaining patterns unreachable")

}

RepeatedAttributePattern => {

write!(f, "attribute name repeated in class pattern")

}

ConflictingNameBindPattern => {

write!(f, "alternative patterns bind different names")

}

BreakContinueReturnInExceptStar => {

write!(

"'break', 'continue' and 'return' cannot appear in an except* block"

)

}

NotImplementedYet => {

write!(f, "RustPython does not implement this feature yet")

}

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