actions-rs 0.1.0

//! Typed access to action inputs.
//!
//! An action input named `foo-bar` is passed to the process as the environment variable `INPUT_FOO-BAR`:
//! the rule is `INPUT_` + uppercased name with spaces replaced by underscores (hyphens are **kept**).
//! This matches `@actions/core`'s `getInput`.
//!
//! The `name → key` transform and the strict boolean parser are pure functions so they are
//! unit-tested without mutating the global environment.

use std::fmt::Display;
use std::str::FromStr;

use crate::error::{Error, Result};
use crate::log;

/// Options controlling how an input is read.
///
/// # Examples
///
/// ```
/// use actions_rs::InputOptions;
///
/// // Required, but keep surrounding whitespace verbatim.
/// let opts = InputOptions { required: true, trim: false };
/// assert!(opts.required);
/// assert_eq!(InputOptions::default().trim, true);
/// ```
#[derive(Debug, Clone, Copy)]
pub struct InputOptions {
    /// Error with [`Error::MissingRequiredInput`] if the input is absent/empty.
    pub required: bool,
    /// Trim leading/trailing whitespace (default `true`, as in `@actions/core`).
    pub trim: bool,
}

impl Default for InputOptions {
    fn default() -> Self {
        Self {
            required: false,
            trim: true,
        }
    }
}

/// Compute the environment-variable key for an input name.
///
/// `INPUT_` + `name.to_uppercase()` with ASCII spaces → `_`.
///
/// # Examples
///
/// ```
/// use actions_rs::input::input_env_key;
///
/// assert_eq!(input_env_key("my input"), "INPUT_MY_INPUT");
/// assert_eq!(input_env_key("my-input"), "INPUT_MY-INPUT"); // hyphen kept
/// ```
#[must_use]
pub fn input_env_key(name: &str) -> String {
    format!("INPUT_{}", name.replace(' ', "_").to_uppercase())
}

fn raw(name: &str) -> Option<String> {
    std::env::var(input_env_key(name)).ok()
}

/// Read an input with explicit [`InputOptions`].
///
/// # Errors
/// [`Error::MissingRequiredInput`] when `options.required` and the **raw** input is absent or empty.\
/// The required check runs *before* trimming (matching `@actions/core`): a whitespace-only required
/// input passes the check and then trims to `""`.
///
/// # Examples
///
/// ```
/// use actions_rs::{InputOptions, input::input_with};
///
/// // Unset + not required -> Ok("").
/// let v = input_with("nope", InputOptions::default()).unwrap();
/// assert_eq!(v, "");
/// ```
pub fn input_with(name: &str, options: InputOptions) -> Result<String> {
    let value = raw(name).unwrap_or_default();
    if options.required && value.is_empty() {
        return Err(Error::MissingRequiredInput(name.to_owned()));
    }
    let value = if options.trim {
        value.trim().to_owned()
    } else {
        value
    };
    Ok(value)
}

/// Read an optional input, trimmed. Returns `""` when unset.
///
/// An action input `foo-bar` arrives as the env var `INPUT_FOO-BAR` (uppercased, spaces → `_`, hyphens kept).
///
/// # Examples
///
/// ```
/// // No `INPUT_NOPE` is set, so this is the empty string, not an error.
/// assert_eq!(actions_rs::input::input("nope"), "");
/// ```
#[must_use]
pub fn input(name: &str) -> String {
    // Infallible: required is false, so `input_with` cannot error here.
    input_with(name, InputOptions::default()).unwrap_or_default()
}

/// Read a required input, trimmed.
///
/// # Errors
/// [`Error::MissingRequiredInput`] when absent or empty.
///
/// # Examples
///
/// ```
/// // `target` was never provided -> a typed error, not a panic.
/// let err = actions_rs::input::input_required("target").unwrap_err();
/// assert!(matches!(err, actions_rs::Error::MissingRequiredInput(_)));
/// ```
pub fn input_required(name: &str) -> Result<String> {
    input_with(
        name,
        InputOptions {
            required: true,
            trim: true,
        },
    )
}

/// Strict YAML 1.2 core-schema boolean parse of `value` for input `name`.
fn parse_bool(name: &str, value: &str) -> Result<bool> {
    match value {
        "true" | "True" | "TRUE" => Ok(true),
        "false" | "False" | "FALSE" => Ok(false),
        _ => Err(Error::InvalidBool {
            name: name.to_owned(),
            value: value.to_owned(),
        }),
    }
}

/// Read a boolean input using the strict YAML 1.2 core schema
/// (`true|True|TRUE|false|False|FALSE`).
///
/// # Errors
/// [`Error::InvalidBool`] for any other value, including absent/empty (matching `@actions/core`'s `getBooleanInput`).
///
/// # Examples
///
/// ```no_run
/// // `with: { verbose: true }` -> INPUT_VERBOSE=true
/// let verbose = actions_rs::input::bool_input("verbose").unwrap_or(false);
/// if verbose {
///     actions_rs::log::info("verbose mode");
/// }
/// ```
pub fn bool_input(name: &str) -> Result<bool> {
    let value = input_with(
        name,
        InputOptions {
            required: false,
            trim: true,
        },
    )?;
    parse_bool(name, &value)
}

/// Split a multiline input on `\n`, dropping empty lines.
/// Each retained line is trimmed.
///
/// # Examples
///
/// ```
/// // `paths` unset -> empty vec, never an error.
/// assert!(actions_rs::input::multiline_input("paths").is_empty());
/// ```
#[must_use]
pub fn multiline_input(name: &str) -> Vec<String> {
    multiline_input_with(name, InputOptions::default()).unwrap_or_default()
}

/// Read a multiline input with explicit [`InputOptions`].
/// Empty raw lines are dropped before optional trimming, matching `@actions/core`.
///
/// # Errors
/// [`Error::MissingRequiredInput`] when `options.required` and the input is absent or empty.
///
/// # Examples
///
/// ```
/// use actions_rs::{InputOptions, input::multiline_input_with};
///
/// // Optional + unset -> Ok(empty).
/// let lines = multiline_input_with("globs", InputOptions::default()).unwrap();
/// assert!(lines.is_empty());
/// ```
pub fn multiline_input_with(name: &str, options: InputOptions) -> Result<Vec<String>> {
    let value = input_with(
        name,
        InputOptions {
            required: options.required,
            trim: false,
        },
    )?;
    Ok(split_multiline(&value, options.trim))
}

fn split_multiline(value: &str, trim: bool) -> Vec<String> {
    let items = value
        .split('\n')
        .filter(|line| !line.is_empty())
        .map(ToOwned::to_owned);
    if trim {
        items.map(|line| line.trim().to_owned()).collect()
    } else {
        items.collect()
    }
}

/// Read an input and parse it via [`FromStr`].
///
/// # Errors
/// [`Error::ParseInput`] if parsing fails (the type's `FromStr::Err` is rendered via [`Display`]).
///
/// # Examples
///
/// ```no_run
/// // INPUT_RETRIES=3
/// let retries: u32 = actions_rs::input::input_as("retries")?;
/// # Ok::<(), actions_rs::Error>(())
/// ```
pub fn input_as<T>(name: &str) -> Result<T>
where
    T: FromStr,
    T::Err: Display,
{
    let value = input_required(name)?;
    value.parse::<T>().map_err(|e| Error::ParseInput {
        name: name.to_owned(),
        reason: e.to_string(),
    })
}

/// Mask the (untrimmed) raw value of input `name` in subsequent logs.
///
/// No-op when the input is unset.
///
/// # Examples
///
/// ```
/// // Redact whatever was passed as the `token` input from later logs.
/// actions_rs::input::mask_input("token");
/// ```
pub fn mask_input(name: &str) {
    if let Some(value) = raw(name).filter(|v| !v.is_empty()) {
        log::mask(value);
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn key_transform() {
        assert_eq!(input_env_key("my input"), "INPUT_MY_INPUT");
        assert_eq!(input_env_key("my-input"), "INPUT_MY-INPUT");
        assert_eq!(input_env_key("myInput"), "INPUT_MYINPUT");
        assert_eq!(input_env_key("a b-c d"), "INPUT_A_B-C_D");
    }

    #[test]
    fn strict_bool_accepts_canonical() {
        for v in ["true", "True", "TRUE"] {
            assert!(parse_bool("x", v).unwrap());
        }
        for v in ["false", "False", "FALSE"] {
            assert!(!parse_bool("x", v).unwrap());
        }
    }

    #[test]
    fn strict_bool_rejects_others() {
        for v in ["yes", "1", "TrUe", "", " true", "0"] {
            let e = parse_bool("flag", v).unwrap_err();
            assert!(
                matches!(e, Error::InvalidBool { .. }),
                "{v:?} should be invalid"
            );
        }
    }

    #[test]
    fn multiline_splits_and_trims_and_drops_empty() {
        assert_eq!(
            split_multiline("a\n  b  \n\n c\n", true),
            vec!["a".to_owned(), "b".to_owned(), "c".to_owned()]
        );
        assert!(split_multiline("", true).is_empty());
    }

    #[test]
    fn multiline_keeps_whitespace_only_entries_until_after_filter() {
        assert_eq!(
            split_multiline("a\n   \n\n b\n", true),
            vec!["a".to_owned(), "".to_owned(), "b".to_owned()]
        );
    }
}