use std::collections::HashMap;

use serde::{Deserialize, Serialize};

use ethers_core::abi::{Abi, Address};

use crate::{Client, Response, Result};

/// Arguments for verifying contracts
#[derive(Debug, Clone, Serialize)]
pub struct VerifyContract {
    pub address: Address,
    pub source: String,
    #[serde(rename = "codeformat")]
    pub code_format: CodeFormat,
    /// if codeformat=solidity-standard-json-input, then expected as
    /// `erc20.sol:erc20`
    #[serde(rename = "contractname", skip_serializing_if = "Option::is_none")]
    pub contract_name: Option<String>,
    #[serde(rename = "compilerversion")]
    pub compiler_version: String,
    /// applicable when codeformat=solidity-single-file
    #[serde(rename = "optimizationUsed", skip_serializing_if = "Option::is_none")]
    optimization_used: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub runs: Option<String>,
    /// NOTE: there is a typo in the etherscan API `constructorArguements`
    #[serde(rename = "constructorArguements", skip_serializing_if = "Option::is_none")]
    pub constructor_arguments: Option<String>,
    #[serde(rename = "evmversion")]
    pub evm_version: Option<String>,
    #[serde(flatten)]
    pub other: HashMap<String, String>,
}

impl VerifyContract {
    pub fn new(address: Address, source: String, compiler_version: String) -> Self {
        Self {
            address,
            source,
            code_format: Default::default(),
            contract_name: None,
            compiler_version,
            optimization_used: None,
            runs: None,
            constructor_arguments: None,
            evm_version: None,
            other: Default::default(),
        }
    }

    pub fn contract_name(mut self, name: impl Into<String>) -> Self {
        self.contract_name = Some(name.into());
        self
    }

    pub fn runs(mut self, runs: u32) -> Self {
        self.runs = Some(format!("{}", runs));
        self
    }

    pub fn optimization(self, optimization: bool) -> Self {
        if optimization {
            self.optimized()
        } else {
            self.not_optimized()
        }
    }

    pub fn optimized(mut self) -> Self {
        self.optimization_used = Some("1".to_string());
        self
    }

    pub fn not_optimized(mut self) -> Self {
        self.optimization_used = Some("0".to_string());
        self
    }

    pub fn code_format(mut self, code_format: CodeFormat) -> Self {
        self.code_format = code_format;
        self
    }

    pub fn evm_version(mut self, evm_version: impl Into<String>) -> Self {
        self.evm_version = Some(evm_version.into());
        self
    }

    pub fn constructor_arguments(
        mut self,
        constructor_arguments: Option<impl Into<String>>,
    ) -> Self {
        self.constructor_arguments = constructor_arguments.map(|s| {
            s.into()
                // TODO is this correct?
                .trim_start_matches("0x")
                .to_string()
        });
        self
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize)]
pub enum CodeFormat {
    #[serde(rename = "solidity-single-file")]
    SingleFile,
    #[serde(rename = "solidity-standard-json-input")]
    StandardJsonInput,
}

impl AsRef<str> for CodeFormat {
    fn as_ref(&self) -> &str {
        match self {
            CodeFormat::SingleFile => "solidity-single-file",
            CodeFormat::StandardJsonInput => "solidity-standard-json-input",
        }
    }
}

impl Default for CodeFormat {
    fn default() -> Self {
        CodeFormat::SingleFile
    }
}

#[derive(Debug, Serialize, Deserialize)]
pub struct ContractMetadata {
    #[serde(flatten)]
    pub items: Vec<Metadata>,
}

impl IntoIterator for ContractMetadata {
    type Item = Metadata;
    type IntoIter = std::vec::IntoIter<Metadata>;

    fn into_iter(self) -> Self::IntoIter {
        self.items.into_iter()
    }
}

impl ContractMetadata {
    /// All ABI from all contracts in the source file
    pub fn abis(&self) -> Result<Vec<Abi>> {
        let mut abis = Vec::with_capacity(self.items.len());
        for item in &self.items {
            abis.push(serde_json::from_str(&item.abi)?);
        }
        Ok(abis)
    }

    /// Combined source code of all contracts
    pub fn source_code(&self) -> String {
        self.items.iter().map(|c| c.source_code.as_str()).collect::<Vec<_>>().join("\n")
    }
}

/// Etherscan contract metadata
#[derive(Debug, Serialize, Deserialize)]
pub struct Metadata {
    #[serde(rename = "SourceCode")]
    pub source_code: String,
    #[serde(rename = "ABI")]
    pub abi: String,
    #[serde(rename = "ContractName")]
    pub contract_name: String,
    #[serde(rename = "CompilerVersion")]
    pub compiler_version: String,
    #[serde(rename = "OptimizationUsed")]
    pub optimization_used: String,
    #[serde(rename = "Runs")]
    pub runs: String,
    #[serde(rename = "ConstructorArguments")]
    pub constructor_arguments: String,
    #[serde(rename = "EVMVersion")]
    pub evm_version: String,
    #[serde(rename = "Library")]
    pub library: String,
    #[serde(rename = "LicenseType")]
    pub license_type: String,
    #[serde(rename = "Proxy")]
    pub proxy: String,
    #[serde(rename = "Implementation")]
    pub implementation: String,
    #[serde(rename = "SwarmSource")]
    pub swarm_source: String,
}

impl Client {
    /// Submit Source Code for Verification
    pub async fn submit_contract_verification(
        &self,
        contract: &VerifyContract,
    ) -> Result<Response<String>> {
        let body = self.create_query("contract", "verifysourcecode", contract);
        Ok(self.post_form(&body).await?)
    }

    /// Check Source Code Verification Status with receipt received from
    /// `[Self::submit_contract_verification]`
    pub async fn check_contract_verification_status(
        &self,
        guid: impl AsRef<str>,
    ) -> Result<Response<String>> {
        let body = self.create_query(
            "contract",
            "checkverifystatus",
            HashMap::from([("guid", guid.as_ref())]),
        );
        Ok(self.post_form(&body).await?)
    }

    /// Returns the contract ABI of a verified contract
    ///
    /// ```no_run
    /// # use ethers_etherscan::Client;
    /// # use ethers_core::types::Chain;
    ///
    /// # #[tokio::main]
    /// # async fn main() {
    ///     let client = Client::new(Chain::Mainnet, "API_KEY").unwrap();
    ///     let abi = client
    ///         .contract_abi("0xBB9bc244D798123fDe783fCc1C72d3Bb8C189413".parse().unwrap())
    ///         .await.unwrap();
    /// # }
    /// ```
    pub async fn contract_abi(&self, address: Address) -> Result<Abi> {
        let query = self.create_query("contract", "getabi", HashMap::from([("address", address)]));
        let resp: Response<String> = self.get_json(&query).await?;
        Ok(serde_json::from_str(&resp.result)?)
    }

    /// Get Contract Source Code for Verified Contract Source Codes
    /// ```no_run
    /// # use ethers_etherscan::Client;
    /// # use ethers_core::types::Chain;
    ///
    /// # #[tokio::main]
    /// # async fn main() {
    ///     let client = Client::new(Chain::Mainnet, "API_KEY").unwrap();
    ///     let meta = client
    ///         .contract_source_code("0xBB9bc244D798123fDe783fCc1C72d3Bb8C189413".parse().unwrap())
    ///         .await.unwrap();
    ///     let code = meta.source_code();
    /// # }
    /// ```
    pub async fn contract_source_code(&self, address: Address) -> Result<ContractMetadata> {
        let query =
            self.create_query("contract", "getsourcecode", HashMap::from([("address", address)]));
        let response: Response<Vec<Metadata>> = self.get_json(&query).await?;
        Ok(ContractMetadata { items: response.result })
    }
}

#[cfg(test)]
mod tests {
    use std::time::Duration;

    use serial_test::serial;

    use ethers_core::types::Chain;

    use crate::{contract::VerifyContract, tests::run_at_least_duration, Client};

    #[tokio::test]
    #[serial]
    #[ignore]
    async fn can_fetch_contract_abi() {
        run_at_least_duration(Duration::from_millis(250), async {
            let client = Client::new_from_env(Chain::Mainnet).unwrap();

            let _abi = client
                .contract_abi("0xBB9bc244D798123fDe783fCc1C72d3Bb8C189413".parse().unwrap())
                .await
                .unwrap();
        })
        .await;
    }

    #[tokio::test]
    #[serial]
    #[ignore]
    async fn can_fetch_contract_source_code() {
        run_at_least_duration(Duration::from_millis(250), async {
            let client = Client::new_from_env(Chain::Mainnet).unwrap();

            let _meta = client
                .contract_source_code("0xBB9bc244D798123fDe783fCc1C72d3Bb8C189413".parse().unwrap())
                .await
                .unwrap();
        })
        .await
    }

    #[tokio::test]
    #[serial]
    #[ignore]
    async fn can_verify_contract() {
        run_at_least_duration(Duration::from_millis(250), async {
            // TODO this needs further investigation

            // https://etherscan.io/address/0x9e744c9115b74834c0f33f4097f40c02a9ac5c33#code
            let contract = include_str!("../resources/UniswapExchange.sol");
            let address = "0x9e744c9115b74834c0f33f4097f40c02a9ac5c33".parse().unwrap();
            let compiler_version = "v0.5.17+commit.d19bba13";
            let constructor_args = "0x000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000005f5e1000000000000000000000000000000000000000000000000000000000000000007596179537761700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000035941590000000000000000000000000000000000000000000000000000000000";

            let client = Client::new_from_env(Chain::Mainnet).unwrap();

            let contract =
                VerifyContract::new(address, contract.to_string(), compiler_version.to_string())
                    .constructor_arguments(Some(constructor_args))
                    .optimization(true)
                    .runs(200);

            let _resp = client.submit_contract_verification(&contract).await;
        }).await
    }
}