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use schemars::JsonSchema;
use serde::{Deserialize, Serialize};

use cosmwasm_std::{
    from_slice, to_binary, to_vec, Addr, Binary, ContractResult, CosmosMsg, Empty, QuerierWrapper,
    QueryRequest, StdError, StdResult, SystemResult, WasmMsg, WasmQuery,
};

use crate::msg::Cw4ExecuteMsg;
use crate::query::HooksResponse;
use crate::{
    member_key, AdminResponse, Cw4QueryMsg, Member, MemberListResponse, MemberResponse, TOTAL_KEY,
};

/// Cw4Contract is a wrapper around Addr that provides a lot of helpers
/// for working with cw4 contracts
///
/// If you wish to persist this, convert to Cw4CanonicalContract via .canonical()
#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
pub struct Cw4Contract(pub Addr);

impl Cw4Contract {
    pub fn new(addr: Addr) -> Self {
        Cw4Contract(addr)
    }

    pub fn addr(&self) -> Addr {
        self.0.clone()
    }

    fn encode_msg(&self, msg: Cw4ExecuteMsg) -> StdResult<CosmosMsg> {
        Ok(WasmMsg::Execute {
            contract_addr: self.addr().into(),
            msg: to_binary(&msg)?,
            send: vec![],
        }
        .into())
    }

    pub fn add_hook<T: Into<String>>(&self, addr: T) -> StdResult<CosmosMsg> {
        let msg = Cw4ExecuteMsg::AddHook { addr: addr.into() };
        self.encode_msg(msg)
    }

    pub fn remove_hook<T: Into<String>>(&self, addr: T) -> StdResult<CosmosMsg> {
        let msg = Cw4ExecuteMsg::AddHook { addr: addr.into() };
        self.encode_msg(msg)
    }

    pub fn update_admin<T: Into<String>>(&self, admin: Option<T>) -> StdResult<CosmosMsg> {
        let msg = Cw4ExecuteMsg::UpdateAdmin {
            admin: admin.map(|x| x.into()),
        };
        self.encode_msg(msg)
    }

    fn encode_smart_query(&self, msg: Cw4QueryMsg) -> StdResult<QueryRequest<Empty>> {
        Ok(WasmQuery::Smart {
            contract_addr: self.addr().into(),
            msg: to_binary(&msg)?,
        }
        .into())
    }

    fn encode_raw_query<T: Into<Binary>>(&self, key: T) -> QueryRequest<Empty> {
        WasmQuery::Raw {
            contract_addr: self.addr().into(),
            key: key.into(),
        }
        .into()
    }

    /// Show the hooks
    pub fn hooks(&self, querier: &QuerierWrapper) -> StdResult<Vec<String>> {
        let query = self.encode_smart_query(Cw4QueryMsg::Hooks {})?;
        let res: HooksResponse = querier.query(&query)?;
        Ok(res.hooks)
    }

    /// Read the total weight
    pub fn total_weight(&self, querier: &QuerierWrapper) -> StdResult<u64> {
        let query = self.encode_raw_query(TOTAL_KEY.as_bytes());
        querier.query(&query)
    }

    /// Check if this address is a member, and if so, with which weight
    pub fn is_member(&self, querier: &QuerierWrapper, addr: &Addr) -> StdResult<Option<u64>> {
        let path = member_key(addr.as_ref());
        let query = self.encode_raw_query(path);

        // We have to copy the logic of Querier.query to handle the empty case, and not
        // try to decode empty result into a u64.
        // TODO: add similar API on Querier - this is not the first time I came across it
        let raw = to_vec(&query)?;
        match querier.raw_query(&raw) {
            SystemResult::Err(system_err) => Err(StdError::generic_err(format!(
                "Querier system error: {}",
                system_err
            ))),
            SystemResult::Ok(ContractResult::Err(contract_err)) => Err(StdError::generic_err(
                format!("Querier contract error: {}", contract_err),
            )),
            SystemResult::Ok(ContractResult::Ok(value)) => {
                // This is the only place we customize
                if value.is_empty() {
                    Ok(None)
                } else {
                    from_slice(&value)
                }
            }
        }
    }

    /// Return the member's weight at the given snapshot - requires a smart query
    pub fn member_at_height<T: Into<String>>(
        &self,
        querier: &QuerierWrapper,
        member: T,
        height: u64,
    ) -> StdResult<Option<u64>> {
        let query = self.encode_smart_query(Cw4QueryMsg::Member {
            addr: member.into(),
            at_height: Some(height),
        })?;
        let res: MemberResponse = querier.query(&query)?;
        Ok(res.weight)
    }

    pub fn list_members(
        &self,
        querier: &QuerierWrapper,
        start_after: Option<String>,
        limit: Option<u32>,
    ) -> StdResult<Vec<Member>> {
        let query = self.encode_smart_query(Cw4QueryMsg::ListMembers { start_after, limit })?;
        let res: MemberListResponse = querier.query(&query)?;
        Ok(res.members)
    }

    /// Read the admin
    pub fn admin(&self, querier: &QuerierWrapper) -> StdResult<Option<String>> {
        let query = self.encode_smart_query(Cw4QueryMsg::Admin {})?;
        let res: AdminResponse = querier.query(&query)?;
        Ok(res.admin)
    }
}