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use std::num::TryFromIntError;

#[derive(thiserror::Error, Debug, Clone)]
pub enum Error {
    // These codes are a result of a malformed input (e.g. validation has not been run)
    #[error("frame stack is too short at offset {0}")]
    TruncatedFrameStack(usize),
    #[error("operand stack is too short at offset {0}")]
    TruncatedOperandStack(usize),
    #[error("empty stack at offset {0}")]
    EmptyStack(usize),
    #[error("type index {0} is out of range")]
    TypeIndexRange(u32, #[source] TryFromIntError),
    #[error("type index {0} refers to a non-existent type")]
    TypeIndex(u32),
    #[error("function index {0} is out of range")]
    FunctionIndexRange(u32, #[source] TryFromIntError),
    #[error("function index {0} refers to a non-existent type")]
    FunctionIndex(u32),
    #[error("global index {0} is out of range")]
    GlobalIndexRange(u32, #[source] TryFromIntError),
    #[error("global index {0} refers to a non-existent global")]
    GlobalIndex(u32),
    #[error("table index {0} is out of range")]
    TableIndexRange(u32, #[source] TryFromIntError),
    #[error("table index {0} refers to a non-existent table")]
    TableIndex(u32),
    #[error("type of local {0} could cannot be found")]
    LocalIndex(u32),
    #[error("too many frames in the function")]
    TooManyFrames,
}