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

//! Birdeye SOL/USD market-price adapter using the official Price Single REST endpoint.

const BIRDEYE_API_KEY_HEADER: &str = "x-api-key";
const BIRDEYE_CHAIN_HEADER: &str = "x-chain";
const BIRDEYE_PRICE_URL: &str = "https://public-api.birdeye.so/defi/price";
const BIRDEYE_PROVIDER_ID: &str = "birdeye";
const BIRDEYE_SOL_MINT: &str = "So11111111111111111111111111111111111111112";

/// Runtime settings for the Birdeye Standard market-price adapter.
pub struct MarketPriceBirdeyeSettings {
    api_key: std::option::Option<crate::MarketPriceApiKey>,
    common: crate::MarketPriceProviderCommonSettings,
}

impl crate::MarketPriceBirdeyeSettings {
    /// Creates Birdeye settings. An API key is mandatory while the provider is enabled.
    pub fn new(enabled: bool, api_key: std::option::Option<std::string::String>) -> ksp_core_lib::Result<Self> {
        let provider_id = match crate::MarketPriceProviderId::new(BIRDEYE_PROVIDER_ID) {
            std::result::Result::Ok(value) => value,
            std::result::Result::Err(error) => return std::result::Result::Err(error),
        };
        let api_key = match api_key {
            std::option::Option::Some(value) => match crate::MarketPriceApiKey::new(BIRDEYE_PROVIDER_ID, value) {
                std::result::Result::Ok(value) => std::option::Option::Some(value),
                std::result::Result::Err(error) => return std::result::Result::Err(error),
            },
            std::option::Option::None if enabled => return std::result::Result::Err(provider_settings_error("api_key")),
            std::option::Option::None => std::option::Option::None,
        };
        let common = crate::MarketPriceProviderCommonSettings::new(provider_id, enabled);
        return std::result::Result::Ok(Self { api_key, common });
    }

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

    fn api_key(&self) -> std::option::Option<&crate::MarketPriceApiKey> {
        return self.api_key.as_ref();
    }
}

impl std::fmt::Debug for crate::MarketPriceBirdeyeSettings {
    fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        return formatter
            .debug_struct("MarketPriceBirdeyeSettings")
            .field("api_key_present", &self.api_key.is_some())
            .field("common", &self.common)
            .finish();
    }
}

/// Birdeye SOL/USD provider adapter backed by the Standard Price Single endpoint.
pub struct MarketPriceBirdeyeProvider {
    admission: crate::HttpAdmissionController,
    descriptor: crate::MarketPriceProviderDescriptor,
    http: crate::HttpRestClient,
    settings: crate::MarketPriceBirdeyeSettings,
}

impl crate::MarketPriceBirdeyeProvider {
    /// Builds one Birdeye provider from validated runtime settings.
    pub fn new(settings: crate::MarketPriceBirdeyeSettings) -> 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 Birdeye capability descriptor.
    #[must_use]
    pub const fn descriptor(&self) -> &crate::MarketPriceProviderDescriptor {
        return &self.descriptor;
    }

    /// Returns the validated Birdeye settings without exposing credential material.
    #[must_use]
    pub const fn settings(&self) -> &crate::MarketPriceBirdeyeSettings {
        return &self.settings;
    }

    /// Fetches one normalized SOL/USD observation from Birdeye Price Single.
    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(BIRDEYE_PROVIDER_ID));
        }
        if let std::result::Result::Err(error) = crate::admit_request(BIRDEYE_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(&self.settings) {
            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, BIRDEYE_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(settings: &crate::MarketPriceBirdeyeSettings) -> ksp_core_lib::Result<crate::HttpGetRequest> {
    let mut request = match crate::HttpGetRequest::new_https(BIRDEYE_PRICE_URL) {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    request.append_query_pair("address", BIRDEYE_SOL_MINT);
    if let std::result::Result::Err(error) = request.insert_sensitive_header(BIRDEYE_CHAIN_HEADER, "solana") {
        return std::result::Result::Err(error);
    }
    let api_key = match settings.api_key() {
        std::option::Option::Some(value) => value,
        std::option::Option::None => return std::result::Result::Err(provider_settings_error("api_key")),
    };
    if let std::result::Result::Err(error) = request.insert_sensitive_header(BIRDEYE_API_KEY_HEADER, api_key.as_str()) {
        return std::result::Result::Err(error);
    }
    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(1, 1, std::option::Option::None, crate::MarketPriceProviderRateLimitScope::Account) {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let quota = match crate::MarketPriceProviderLongTermQuota::new(
        30_000,
        crate::MarketPriceProviderQuotaPeriod::Month,
        crate::MarketPriceProviderQuotaUnit::ComputeUnits,
    ) {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let request_cost = match crate::MarketPriceProviderRequestCost::new(3, crate::MarketPriceProviderQuotaUnit::ComputeUnits) {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let descriptor = match crate::MarketPriceProviderDescriptor::new(
        provider_id,
        "Birdeye",
        crate::MarketPriceSemantics::SolanaSpot,
        crate::MarketPriceProviderAuthMode::RequiredApiKey,
        rate_limit,
        std::option::Option::Some(quota),
        true,
    ) {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    return descriptor.with_sol_usd_request_cost(request_cost);
}

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::<BirdeyeWireResponse>(bytes) {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => {
            return std::result::Result::Err(crate::invalid_provider_response_with_source(BIRDEYE_PROVIDER_ID, "response", error));
        },
    };
    if !wire.success {
        return std::result::Result::Err(crate::invalid_provider_response(BIRDEYE_PROVIDER_ID, "success"));
    }
    let data = match wire.data {
        std::option::Option::Some(value) => value,
        std::option::Option::None => return std::result::Result::Err(crate::invalid_provider_response(BIRDEYE_PROVIDER_ID, "data")),
    };
    let price_raw = match data.value.as_deref() {
        std::option::Option::Some(value) => value,
        std::option::Option::None => return std::result::Result::Err(crate::invalid_provider_response(BIRDEYE_PROVIDER_ID, "data.value")),
    };
    let price = match crate::MarketPriceDecimal::parse_json_raw(price_raw) {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let provider_timestamp = match data.update_unix_time.and_then(crate::market_price_timestamp_from_unix_seconds) {
        std::option::Option::Some(value) => value,
        std::option::Option::None => return std::result::Result::Err(crate::invalid_provider_response(BIRDEYE_PROVIDER_ID, "data.updateUnixTime")),
    };
    let provenance = match crate::MarketPriceProvenance::new("birdeye:solana:wsol:value") {
        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::SolanaSpot,
        request_started_at,
        received_at,
        std::option::Option::Some(provider_timestamp),
        provenance,
    );
}

fn provider_settings_error(field: &'static str) -> ksp_core_lib::Error {
    return ksp_core_lib::Error::new(crate::ERROR_CODE_MARKET_PRICE_PROVIDER_SETTINGS_INVALID, "Birdeye market-price settings are invalid")
        .with_context("provider", BIRDEYE_PROVIDER_ID)
        .with_context("field", field);
}

#[derive(serde::Deserialize)]
struct BirdeyeWireData {
    #[serde(rename = "updateUnixTime")]
    update_unix_time: std::option::Option<u64>,
    value: std::option::Option<std::boxed::Box<serde_json::value::RawValue>>,
}

#[derive(serde::Deserialize)]
struct BirdeyeWireResponse {
    data: std::option::Option<BirdeyeWireData>,
    success: bool,
}

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