use anyhow::Result;
use serde::{Deserialize, Serialize};

use crate::Router;

/// TollGate provisioning parameters.
///
/// `mint_url` must be the externally-reachable URL of the Archy Cashu mint —
/// TollGate customers connect from outside the Archy node's loopback, so
/// localhost URLs will not work. Resolve this from the running mint app before
/// calling `provision`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TollGateConfig {
    /// SSID name for the pay-as-you-go network.
    pub ssid: String,
    /// Externally-reachable URL of the Archy Cashu mint.
    pub mint_url: String,
    /// Price in satoshis per `step_size` interval.
    pub price_sats: u64,
    /// Step size in milliseconds (default: 60000 = 1 minute).
    pub step_size_ms: u64,
    /// Minimum steps a customer must purchase at once.
    pub min_steps: u32,
    /// Whether the TollGate service should be running and enabled at boot.
    pub enabled: bool,
}

impl Default for TollGateConfig {
    fn default() -> Self {
        Self {
            ssid: "archipelago".to_string(),
            mint_url: String::new(), // must be set by caller from the running mint app
            price_sats: 10,
            step_size_ms: 60_000,
            min_steps: 1,
            enabled: true,
        }
    }
}

/// Write TollGate UCI configuration and commit.
///
/// Maps TIP-01 / TIP-02 fields onto UCI keys used by tollgate-module-basic-go.
pub fn apply(router: &Router, cfg: &TollGateConfig) -> Result<()> {
    router.uci_apply(
        "tollgate",
        &[
            ("tollgate.main", "tollgate"),
            ("tollgate.main.enabled", if cfg.enabled { "1" } else { "0" }),
            ("tollgate.main.metric", "milliseconds"),
            ("tollgate.main.step_size", &cfg.step_size_ms.to_string()),
            ("tollgate.main.min_steps", &cfg.min_steps.to_string()),
            ("tollgate.main.price_per_step", &cfg.price_sats.to_string()),
            ("tollgate.main.currency", "sat"),
            ("tollgate.main.mint_url", &cfg.mint_url),
        ],
    )?;
    Ok(())
}