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//! Zephyr Rust SDK
//! 
//! The zephyr rust sdk aids developers in writing programs for the
//! Zephyr Virtual Machine.
//! 
//! ## Hello Ledger Example
//! 
//! ```
//! use rs_zephyr_sdk::{bincode, log, stellar_xdr::next::{Limits, WriteXdr}, Condition, DatabaseDerive, DatabaseInteract, EnvClient, ZephyrVal};
//! 
//! #[derive(DatabaseDerive, Clone)]
//! #[with_name("curr_seq")]
//! struct Sequence {
//!     pub current: u32,
//! }
//! 
//! #[no_mangle]
//! pub extern "C" fn on_close() {
//!    let env = EnvClient::new();
//!    let reader = env.reader();
//!
//!    let sequence = Sequence {
//!        current: reader.ledger_sequence()
//!    };
//!
//!    if let Some(last) = Sequence::read_to_rows(&env).iter().find(|x| x.current == sequence.current - 1) {
//!        sequence.update(&env, &[Condition::ColumnEqualTo("current".into(), bincode::serialize(&ZephyrVal::U32(last.current)).unwrap())]);
//!    } else {
//!        sequence.put(&env)
//!    }
//! }
//! ```
//! 

#![warn(missing_docs)]

mod database;
mod ledger_meta;
mod symbol;
mod ledger;
mod env;
mod external;
mod logger;

pub mod prelude;

use rs_zephyr_common::ZephyrStatus;
use thiserror::Error;

pub use env::EnvClient;
pub use database::{TableRow, TableRows, DatabaseInteract};
pub use ledger_meta::MetaReader;
pub use rs_zephyr_common::ContractDataEntry;
pub use ledger_meta::EntryChanges;
pub use soroban_sdk;
//pub use stellar_xdr;
pub use database::Condition;
pub use rs_zephyr_common::{ZephyrVal, http::{AgnosticRequest, Method}};
pub use bincode;
pub use macros::DatabaseInteract as DatabaseDerive;

fn to_fixed<T, const N: usize>(v: Vec<T>) -> [T; N] {
    v.try_into()
        .unwrap_or_else(|v: Vec<T>| panic!("Expected a Vec of length {} but it was {}", N, v.len()))
}

//extern crate wee_alloc;
//
//#[global_allocator]
//static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;

/// Zephyr SDK errors.
#[derive(Clone, Debug, Copy, Error)]
#[allow(missing_docs)]
pub enum SdkError {
    #[error("Conversion error.")]
    Conversion,

    #[error("Error in reading database.")]
    DbRead,

    #[error("Error in writing database.")]
    DbWrite,

    #[error("No value found on host pseudo store.")]
    NoValOnStack,

    #[error("Incorrect host configurations.")]
    HostConfiguration,

    #[error("Unknown error.")]
    Unknown
}

impl SdkError {
    fn express_from_status(status: i64) -> Result<(), Self> {
        match ZephyrStatus::from(status as u32) {
            ZephyrStatus::Success => Ok(()),
            ZephyrStatus::DbReadError => Err(SdkError::DbRead),
            ZephyrStatus::DbWriteError => Err(SdkError::DbWrite),
            ZephyrStatus::NoValOnStack => Err(SdkError::NoValOnStack),
            ZephyrStatus::HostConfiguration => Err(SdkError::HostConfiguration),
            ZephyrStatus::Unknown => Err(SdkError::Unknown)
        }
    }
}


/// Some sparse scval utils.
/// Note that these might be deprecated in the future.
#[allow(missing_docs)]
pub mod utils {
    use soroban_sdk::xdr::{Int128Parts, ScMapEntry, ScSymbol, ScVal, ScVec, VecM};

    use crate::SdkError;

    pub fn to_datakey_u32(int: u32) -> ScVal {
        ScVal::U32(int)
    }

    pub fn to_datakey_symbol(variant_str: &str) -> ScVal {
        let tot_s_val = ScVal::Symbol(ScSymbol(variant_str.to_string().try_into().unwrap()));

        ScVal::Vec(Some(ScVec(VecM::try_from(vec![tot_s_val]).unwrap())))
    }

    pub fn instance_entries(val: &ScVal) -> Option<Vec<ScMapEntry>> {
        if let ScVal::ContractInstance(instance) = val {
            if let Some(map) = &instance.storage {
                return Some(map.to_vec());
            }
        }

        None
    }

    pub fn to_scval_symbol(from: &str) -> Result<ScVal, SdkError> {
        Ok(ScVal::Symbol(ScSymbol(from.try_into().map_err(|_| SdkError::Conversion)?)))
    }

    pub fn parts_to_i128(parts: &Int128Parts) -> i128 {
        ((parts.hi as i128) << 64) | (parts.lo as i128)
    }

    pub fn to_array<T, const N: usize>(v: Vec<T>) -> [T; N] {
        v.try_into()
            .unwrap_or_else(|v: Vec<T>| panic!("Expected a Vec of length {} but it was {}", N, v.len()))
    }
}