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use std::{convert::TryFrom, mem, u32};

use types::{
    bytesrepr::{self, FromBytes, ToBytes},
    CLValue,
};

use crate::{account::Account, contract::Contract, TypeMismatch};

#[repr(u8)]
enum Tag {
    CLValue = 0,
    Account = 1,
    Contract = 2,
}

#[derive(Eq, PartialEq, Clone, Debug)]
pub enum StoredValue {
    CLValue(CLValue),
    Account(Account),
    Contract(Contract),
}

impl StoredValue {
    pub fn as_cl_value(&self) -> Option<&CLValue> {
        match self {
            StoredValue::CLValue(cl_value) => Some(cl_value),
            _ => None,
        }
    }

    pub fn as_account(&self) -> Option<&Account> {
        match self {
            StoredValue::Account(account) => Some(account),
            _ => None,
        }
    }

    pub fn as_contract(&self) -> Option<&Contract> {
        match self {
            StoredValue::Contract(contract) => Some(contract),
            _ => None,
        }
    }

    pub fn type_name(&self) -> String {
        match self {
            StoredValue::CLValue(cl_value) => format!("{:?}", cl_value.cl_type()),
            StoredValue::Account(_) => "Account".to_string(),
            StoredValue::Contract(_) => "Contract".to_string(),
        }
    }
}

impl TryFrom<StoredValue> for CLValue {
    type Error = TypeMismatch;

    fn try_from(stored_value: StoredValue) -> Result<Self, Self::Error> {
        match stored_value {
            StoredValue::CLValue(cl_value) => Ok(cl_value),
            _ => Err(TypeMismatch::new(
                "CLValue".to_string(),
                stored_value.type_name(),
            )),
        }
    }
}

impl TryFrom<StoredValue> for Account {
    type Error = TypeMismatch;

    fn try_from(stored_value: StoredValue) -> Result<Self, Self::Error> {
        match stored_value {
            StoredValue::Account(account) => Ok(account),
            _ => Err(TypeMismatch::new(
                "Account".to_string(),
                stored_value.type_name(),
            )),
        }
    }
}

impl TryFrom<StoredValue> for Contract {
    type Error = TypeMismatch;

    fn try_from(stored_value: StoredValue) -> Result<Self, Self::Error> {
        match stored_value {
            StoredValue::Contract(contract) => Ok(contract),
            _ => Err(TypeMismatch::new(
                "Contract".to_string(),
                stored_value.type_name(),
            )),
        }
    }
}

fn to_bytes<T: ToBytes>(value: &T, tag: Tag) -> Result<Vec<u8>, bytesrepr::Error> {
    let mut bytes = value.to_bytes()?;
    if bytes.len() >= u32::max_value() as usize - mem::size_of::<Tag>() {
        return Err(bytesrepr::Error::OutOfMemory);
    }

    let mut result = Vec::with_capacity(bytes.len() + mem::size_of::<Tag>());
    result.push(tag as u8);
    result.append(&mut bytes);
    Ok(result)
}

impl ToBytes for StoredValue {
    fn to_bytes(&self) -> Result<Vec<u8>, bytesrepr::Error> {
        match self {
            StoredValue::CLValue(cl_value) => to_bytes(cl_value, Tag::CLValue),
            StoredValue::Account(account) => to_bytes(account, Tag::Account),
            StoredValue::Contract(contract) => to_bytes(contract, Tag::Contract),
        }
    }
}

impl FromBytes for StoredValue {
    fn from_bytes(bytes: &[u8]) -> Result<(Self, &[u8]), bytesrepr::Error> {
        let (tag, remainder): (u8, &[u8]) = FromBytes::from_bytes(bytes)?;
        match tag {
            tag if tag == Tag::CLValue as u8 => CLValue::from_bytes(remainder)
                .map(|(cl_value, remainder)| (StoredValue::CLValue(cl_value), remainder)),
            tag if tag == Tag::Account as u8 => Account::from_bytes(remainder)
                .map(|(account, remainder)| (StoredValue::Account(account), remainder)),
            tag if tag == Tag::Contract as u8 => Contract::from_bytes(remainder)
                .map(|(contract, remainder)| (StoredValue::Contract(contract), remainder)),
            _ => Err(bytesrepr::Error::Formatting),
        }
    }
}

pub mod gens {
    use proptest::prelude::*;

    use types::gens::cl_value_arb;

    use super::StoredValue;
    use crate::{account::gens::account_arb, contract::gens::contract_arb};

    pub fn stored_value_arb() -> impl Strategy<Value = StoredValue> {
        prop_oneof![
            cl_value_arb().prop_map(StoredValue::CLValue),
            account_arb().prop_map(StoredValue::Account),
            contract_arb().prop_map(StoredValue::Contract),
        ]
    }
}