use brk_types::OutputType;

/// Dust floor used by `Config::default()` and `default_eligible_bin`.
pub(crate) const DEFAULT_MIN_SATS: u64 = 1000;

/// Output types skipped by `Config::default()` (protocol-dominated) and the
/// source of truth for `default_eligible_bin`'s precomputed exclusion mask.
pub(crate) const DEFAULT_EXCLUDED_OUTPUT_TYPES: &[OutputType] = &[OutputType::P2TR];

#[derive(Clone)]
pub struct Config {
    /// EMA decay: 2/(N+1) where N is span in blocks. 2/7 = 6-block span.
    pub alpha: f64,
    /// Ring buffer depth. 12 blocks for deterministic convergence at any start height.
    pub window_size: usize,
    /// Search window bins below/above previous estimate. Asymmetric for log-scale.
    pub search_below: usize,
    pub search_above: usize,
    /// Minimum output value in sats (dust filter).
    pub min_sats: u64,
    /// Exclude round BTC amounts that create false stencil matches.
    pub exclude_common_round_values: bool,
    /// Output types to ignore (e.g. P2TR, P2WSH are noisy).
    pub excluded_output_types: Vec<OutputType>,
}

impl Default for Config {
    fn default() -> Self {
        Self {
            alpha: 2.0 / 7.0,
            window_size: 12,
            search_below: 9,
            search_above: 11,
            min_sats: DEFAULT_MIN_SATS,
            exclude_common_round_values: true,
            excluded_output_types: DEFAULT_EXCLUDED_OUTPUT_TYPES.to_vec(),
        }
    }
}