// file: crates/ksp-offchain-transport-lib/src/market_price_coinpaprika.rs
// version: 1

//! CoinPaprika SOL/USD market-price adapter using the free official REST API directly through `reqwest`.

const COINPAPRIKA_PROVIDER_ID: &str = "coinpaprika";
const COINPAPRIKA_SOL_ID: &str = "sol-solana";
const COINPAPRIKA_SOL_TICKER_URL: &str = "https://api.coinpaprika.com/v1/tickers/sol-solana";

/// Runtime settings for the keyless CoinPaprika market-price adapter.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct MarketPriceCoinPaprikaSettings {
    common: crate::MarketPriceProviderCommonSettings,
}

impl crate::MarketPriceCoinPaprikaSettings {
    /// Creates CoinPaprika settings for the free keyless REST surface.
    pub fn new(enabled: bool) -> ksp_core_lib::Result<Self> {
        let provider_id = match crate::MarketPriceProviderId::new(COINPAPRIKA_PROVIDER_ID) {
            std::result::Result::Ok(value) => value,
            std::result::Result::Err(error) => return std::result::Result::Err(error),
        };
        return std::result::Result::Ok(Self { common: crate::MarketPriceProviderCommonSettings::new(provider_id, enabled) });
    }

    /// Returns common provider identity and enablement settings.
    #[must_use]
    pub const fn common(&self) -> &crate::MarketPriceProviderCommonSettings {
        return &self.common;
    }
}

/// CoinPaprika SOL/USD provider adapter.
pub struct MarketPriceCoinPaprikaProvider {
    admission: crate::HttpAdmissionController,
    descriptor: crate::MarketPriceProviderDescriptor,
    http: crate::HttpRestClient,
    settings: crate::MarketPriceCoinPaprikaSettings,
}

impl crate::MarketPriceCoinPaprikaProvider {
    /// Builds one CoinPaprika provider from validated runtime settings.
    pub fn new(settings: crate::MarketPriceCoinPaprikaSettings) -> ksp_core_lib::Result<Self> {
        let descriptor = match descriptor_for(settings.common().provider_id().clone()) {
            std::result::Result::Ok(value) => value,
            std::result::Result::Err(error) => return std::result::Result::Err(error),
        };
        let runtime = match crate::provider_http_runtime(descriptor.rate_limit()) {
            std::result::Result::Ok(value) => value,
            std::result::Result::Err(error) => return std::result::Result::Err(error),
        };
        return std::result::Result::Ok(Self { admission: runtime.1, descriptor, http: runtime.0, settings });
    }

    /// Returns the provider-neutral CoinPaprika capability descriptor.
    #[must_use]
    pub const fn descriptor(&self) -> &crate::MarketPriceProviderDescriptor {
        return &self.descriptor;
    }

    /// Returns the validated CoinPaprika runtime settings.
    #[must_use]
    pub const fn settings(&self) -> &crate::MarketPriceCoinPaprikaSettings {
        return &self.settings;
    }

    /// Fetches one normalized SOL/USD observation from CoinPaprika.
    pub async fn fetch_sol_usd(&self) -> ksp_core_lib::Result<crate::MarketPriceObservation> {
        if !self.settings.common().enabled() {
            return std::result::Result::Err(crate::provider_disabled_error(COINPAPRIKA_PROVIDER_ID));
        }
        if let std::result::Result::Err(error) = crate::admit_request(COINPAPRIKA_PROVIDER_ID, &self.admission) {
            return std::result::Result::Err(error);
        }
        let request_started_at = match crate::current_timestamp() {
            std::result::Result::Ok(value) => value,
            std::result::Result::Err(error) => return std::result::Result::Err(error),
        };
        let request = match build_request() {
            std::result::Result::Ok(value) => value,
            std::result::Result::Err(error) => return std::result::Result::Err(error),
        };
        let document = match crate::get_json(&self.http, &self.admission, COINPAPRIKA_PROVIDER_ID, request).await {
            std::result::Result::Ok(value) => value,
            std::result::Result::Err(error) => return std::result::Result::Err(error),
        };
        let received_at = match crate::current_timestamp() {
            std::result::Result::Ok(value) => value,
            std::result::Result::Err(error) => return std::result::Result::Err(error),
        };
        return parse_response(document.as_bytes(), self.settings.common().provider_id().clone(), request_started_at, received_at);
    }
}

fn build_request() -> ksp_core_lib::Result<crate::HttpGetRequest> {
    let mut request = match crate::HttpGetRequest::new_https(COINPAPRIKA_SOL_TICKER_URL) {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    request.append_query_pair("quotes", "USD");
    return std::result::Result::Ok(request);
}

fn descriptor_for(provider_id: crate::MarketPriceProviderId) -> ksp_core_lib::Result<crate::MarketPriceProviderDescriptor> {
    let rate_limit = match crate::MarketPriceProviderRateLimit::fixed(10, 1, std::option::Option::None, crate::MarketPriceProviderRateLimitScope::Ip) {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let quota =
        match crate::MarketPriceProviderLongTermQuota::new(20_000, crate::MarketPriceProviderQuotaPeriod::Month, crate::MarketPriceProviderQuotaUnit::Requests)
        {
            std::result::Result::Ok(value) => value,
            std::result::Result::Err(error) => return std::result::Result::Err(error),
        };
    return crate::MarketPriceProviderDescriptor::new(
        provider_id,
        "CoinPaprika",
        crate::MarketPriceSemantics::AggregatedMarket,
        crate::MarketPriceProviderAuthMode::None,
        rate_limit,
        std::option::Option::Some(quota),
        true,
    );
}

fn parse_response(
    bytes: &[u8],
    provider_id: crate::MarketPriceProviderId,
    request_started_at: crate::MarketPriceTimestamp,
    received_at: crate::MarketPriceTimestamp,
) -> ksp_core_lib::Result<crate::MarketPriceObservation> {
    let wire = match serde_json::from_slice::<CoinPaprikaWireResponse>(bytes) {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => {
            return std::result::Result::Err(crate::invalid_provider_response_with_source(COINPAPRIKA_PROVIDER_ID, "response", error));
        },
    };
    if wire.id != COINPAPRIKA_SOL_ID || wire.symbol != "SOL" {
        return std::result::Result::Err(crate::invalid_provider_response(COINPAPRIKA_PROVIDER_ID, "identity"));
    }
    let price = match crate::MarketPriceDecimal::parse_json_raw(wire.quotes.usd.price.as_ref()) {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let provider_timestamp = match crate::market_price_timestamp_from_rfc3339(wire.last_updated.as_str()) {
        std::option::Option::Some(value) => value,
        std::option::Option::None => {
            return std::result::Result::Err(crate::invalid_provider_response(COINPAPRIKA_PROVIDER_ID, "last_updated"));
        },
    };
    let provenance = match crate::MarketPriceProvenance::new("coinpaprika:sol-solana:usd") {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    return crate::MarketPriceObservation::new(
        provider_id,
        price,
        crate::MarketPriceSemantics::AggregatedMarket,
        request_started_at,
        received_at,
        std::option::Option::Some(provider_timestamp),
        provenance,
    );
}

#[derive(serde::Deserialize)]
struct CoinPaprikaWireQuote {
    price: std::boxed::Box<serde_json::value::RawValue>,
}

#[derive(serde::Deserialize)]
struct CoinPaprikaWireQuotes {
    #[serde(rename = "USD")]
    usd: CoinPaprikaWireQuote,
}

#[derive(serde::Deserialize)]
struct CoinPaprikaWireResponse {
    id: std::string::String,
    last_updated: std::string::String,
    quotes: CoinPaprikaWireQuotes,
    symbol: std::string::String,
}

#[cfg(test)]
#[path = "../unit_tests/market_price_coinpaprika.rs"]
mod tests;