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//! Decoder of *.contract
use ceres_std::{BTreeMap, String, Vec};
use derivative::Derivative;
use serde::{Deserialize, Serialize};

type Method = (String, Vec<(Option<String>, u32)>);
type MethodWithName = (String, String, Vec<(Option<String>, u32)>);

/// A struct for operating *.contract
#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct Metadata {
    pub source: Source,
    pub contract: Contract,
    pub spec: Spec,
}

impl Metadata {
    /// Get all messages
    pub fn messages(&self) -> BTreeMap<String, Method> {
        let methods: Vec<MethodWithName> = self
            .spec
            .messages
            .iter()
            .map(|c| {
                (
                    if c.name.is_empty() {
                        "".into()
                    } else {
                        c.name[0].clone()
                    },
                    c.selector.clone(),
                    c.args
                        .iter()
                        .map(|a| {
                            (
                                if !a.r#type.display_name.is_empty() {
                                    Some(a.r#type.display_name[0].clone())
                                } else {
                                    None
                                },
                                a.r#type.r#type,
                            )
                        })
                        .collect(),
                )
            })
            .collect();

        let mut map = BTreeMap::new();
        for v in methods {
            map.insert(v.0.clone(), (v.1.clone(), v.2));
        }
        map
    }

    /// Get all constructors
    pub fn constructors(&self) -> BTreeMap<String, Method> {
        let methods: Vec<MethodWithName> = self
            .spec
            .constructors
            .iter()
            .map(|c| {
                (
                    if !c.name.is_empty() {
                        c.name[0].clone()
                    } else {
                        "".into()
                    },
                    c.selector.clone(),
                    c.args
                        .iter()
                        .map(|a| {
                            (
                                if !a.r#type.display_name.is_empty() {
                                    Some(a.r#type.display_name[0].clone())
                                } else {
                                    None
                                },
                                a.r#type.r#type,
                            )
                        })
                        .collect(),
                )
            })
            .collect();

        let mut map = BTreeMap::new();
        for v in methods {
            map.insert(v.0.clone(), (v.1.clone(), v.2));
        }
        map
    }
}

/// Source section in *.contract

#[derive(Clone, Derivative, Deserialize, Serialize)]
#[derivative(Debug)]
pub struct Source {
    /// code hash
    pub hash: String,
    /// hex string in the output metadata, and
    /// this is required in our decoder
    #[derivative(Debug = "ignore")]
    pub wasm: String,
}

/// Contract section in *.contract
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Contract {
    /// Just for displaying this on UIs
    pub name: String,
}

/// ABI of methods
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Spec {
    pub constructors: Vec<Constructor>,
    pub messages: Vec<Message>,
}

/// Constructor
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Constructor {
    pub args: Vec<Arg>,
    pub docs: Vec<String>,
    pub name: Vec<String>,
    pub selector: String,
}

/// Message
#[derive(Clone, Debug, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct Message {
    pub args: Vec<Arg>,
    pub docs: Vec<String>,
    pub mutates: bool,
    pub name: Vec<String>,
    pub payable: bool,
    // # NOTE
    //
    // For deserializing this field, implement `Deserialize` trait for this.
    //
    // - - - - - - - - -
    //
    // pub return_type: Type,
    pub selector: String,
}

/// Custom arg interface
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Arg {
    pub name: String,
    pub r#type: Type,
}

/// Type defination
#[derive(Clone, Debug, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct Type {
    pub display_name: Vec<String>,
    pub r#type: u32,
}