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use std::fmt;

use crate::parse_contract_addr;
use cosmwasm_std::{to_binary, Addr, Attribute, BankMsg, Binary, Coin, CosmosMsg, Event, WasmMsg};
use schemars::JsonSchema;
use serde::Serialize;

#[derive(Default, Clone, Debug)]
pub struct AppResponse {
    pub events: Vec<Event>,
    pub data: Option<Binary>,
}

impl AppResponse {
    // Return all custom attributes returned by the contract in the `idx` event.
    // We assert the type is wasm, and skip the contract_address attribute.
    pub fn custom_attrs(&self, idx: usize) -> &[Attribute] {
        assert_eq!(self.events[idx].ty.as_str(), "wasm");
        &self.events[idx].attributes[1..]
    }
}

pub trait Executor<C>
where
    C: Clone + fmt::Debug + PartialEq + JsonSchema + 'static,
{
    /// Runs arbitrary CosmosMsg.
    /// This will create a cache before the execution, so no state changes are persisted if this
    /// returns an error, but all are persisted on success.
    fn execute(&mut self, sender: Addr, msg: CosmosMsg<C>) -> Result<AppResponse, String>;

    /// Create a contract and get the new address.
    /// This is just a helper around execute()
    fn instantiate_contract<T: Serialize, U: Into<String>>(
        &mut self,
        code_id: u64,
        sender: Addr,
        init_msg: &T,
        send_funds: &[Coin],
        label: U,
    ) -> Result<Addr, String> {
        // instantiate contract
        let init_msg = to_binary(init_msg).map_err(|e| e.to_string())?;
        let msg = WasmMsg::Instantiate {
            admin: None,
            code_id,
            msg: init_msg,
            funds: send_funds.to_vec(),
            label: label.into(),
        };
        let res = self.execute(sender, msg.into())?;
        parse_contract_addr(&res.data)
    }

    /// Execute a contract and process all returned messages.
    /// This is just a helper around execute()
    fn execute_contract<T: Serialize>(
        &mut self,
        sender: Addr,
        contract_addr: Addr,
        msg: &T,
        send_funds: &[Coin],
    ) -> Result<AppResponse, String> {
        let msg = to_binary(msg).map_err(|e| e.to_string())?;
        let msg = WasmMsg::Execute {
            contract_addr: contract_addr.into(),
            msg,
            funds: send_funds.to_vec(),
        };
        self.execute(sender, msg.into())
    }

    fn send_tokens(
        &mut self,
        sender: Addr,
        recipient: Addr,
        amount: &[Coin],
    ) -> Result<AppResponse, String> {
        let msg = BankMsg::Send {
            to_address: recipient.to_string(),
            amount: amount.to_vec(),
        };
        self.execute(sender, msg.into())
    }
}