use crate::*;
use indexer::Indexer;

// data derived from command arguments

/// Data of current command
/// can also include fetched information
#[derive(Default)]
pub struct Data {
	// command line arguments
	pub args: Args,
	// config
	pub cfg: conf::Config,
	// rpc to substrate client
	pub client: Option<Client>,
	// graphql to duniter-indexer
	pub indexer: Option<Indexer>,
	// user address
	pub address: Option<AccountId>,
	// user keypair
	pub keypair: Option<Pair>,
	// user identity index
	pub idty_index: Option<u32>,
	// token decimals
	pub token_decimals: u32,
	// token symbol
	pub token_symbol: String,
	// genesis hash
	pub genesis_hash: Hash,
	// indexer genesis hash
	pub indexer_genesis_hash: Hash,
}

/// system properties defined in client specs
#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct SystemProperties {
	token_decimals: u32,
	token_symbol: String,
}

// implement helper functions for Data
impl Data {
	/// --- constructor ---
	pub fn new(args: Args) -> Self {
		Self {
			args,
			cfg: confy::load("gcli", None).expect("must be able to build config"),
			token_decimals: 0,
			token_symbol: "tokens".into(),
			..Default::default()
		}
	}
	// --- getters ---
	// the "unwrap" should not fail if data is well prepared
	pub fn client(&self) -> &Client {
		self.client.as_ref().expect("must build client first")
	}
	pub fn indexer(&self) -> &Indexer {
		self.indexer.as_ref().expect("indexer is not set up")
	}
	pub fn address(&self) -> AccountId {
		self.address.clone().expect("an address is needed")
	}
	pub fn keypair(&self) -> Pair {
		self.keypair.clone().expect("a keypair is needed")
	}
	pub fn idty_index(&self) -> u32 {
		self.idty_index.expect("must fetch idty index first")
	}
	// --- methods ---
	pub fn format_balance(&self, amount: Balance) -> String {
		let base: u32 = 10;
		format!(
			"{} {}",
			(amount as f32) / (base.pow(self.token_decimals) as f32),
			self.token_symbol
		)
	}
	// --- mutators ---
	/// force an address if needed
	pub fn build_address(mut self) -> Self {
		self.address = Some(
			get_keys(
				self.args.secret_format,
				&self.args.address,
				&self.args.secret,
				NeededKeys::Public,
			)
			.expect("needed")
			.0
			.expect("needed"),
		);
		self
	}
	/// force a keypair if needed
	pub fn build_keypair(mut self) -> Self {
		let (address, keypair) = get_keys(
			self.args.secret_format,
			&self.args.address,
			&self.args.secret,
			NeededKeys::Secret,
		)
		.expect("needed");
		self.address = address;
		self.keypair = keypair;
		self
	}
	/// build a client from url
	// TODO get client from a pre-defined list
	pub async fn build_client(mut self) -> Self {
		self.client = Some(Client::from_url(&self.args.url).await.unwrap_or_else(|_| {
			panic!(
				"could not establish connection with the server {}",
				self.args.url
			)
		}));
		self
	}
	/// build an indexer if not disabled
	// TODO check that indexer matches client
	pub fn build_indexer(mut self) -> Result<Self, anyhow::Error> {
		self.indexer = if self.args.no_indexer {
			None
		} else {
			Some(Indexer {
				gql_client: reqwest::Client::builder()
					.user_agent("gcli/0.1.0")
					.build()?,
				gql_url: self.args.indexer.clone(),
			})
		};
		Ok(self)
	}
	/// get issuer index
	/// needs address and client first
	pub async fn fetch_idty_index(mut self) -> Result<Self, anyhow::Error> {
		self.idty_index = Some(
			commands::identity::get_idty_index_by_account_id(self.client(), &self.address())
				.await?
				.ok_or(anyhow::anyhow!("needs to be member to use this command"))?,
		);
		Ok(self)
	}
	/// get genesis hash
	pub async fn fetch_genesis_hash(mut self) -> Result<Self, anyhow::Error> {
		self.genesis_hash = self
			.client()
			.storage()
			.fetch(&runtime::storage().system().block_hash(0), None)
			.await?
			.unwrap();
		Ok(self)
	}
	/// get indexer genesis hash
	pub async fn fetch_indexer_genesis_hash(mut self) -> Result<Self, anyhow::Error> {
		self.indexer_genesis_hash = self.indexer().fetch_genesis_hash().await?;
		Ok(self)
	}
	/// get properties
	pub async fn fetch_system_properties(mut self) -> Result<Self, anyhow::Error> {
		let system_properties = self.client().rpc().system_properties().await?;
		let system_properties = serde_json::from_value::<SystemProperties>(
			serde_json::Value::Object(system_properties),
		)?;
		self.token_decimals = system_properties.token_decimals;
		self.token_symbol = system_properties.token_symbol;
		Ok(self)
	}
	// TODO prevent awaits in async methods, prefer register requests and execute them all at once with a join
	// example below
	// example!(
	// use futures::join;
	// 	let addr_idty_index = runtime::storage().identity().identity_index_of(&account_id);
	// 	let addr_block_hash = runtime::storage().system().block_hash(0);
	// 	// Multiple fetches can be done in parallel.
	// 	let (idty_index, genesis_hash) = join!(
	// 		api.storage().fetch(&addr_idty_index, None),
	// 		api.storage().fetch(&addr_block_hash, None)
	// 	);
	// );
}