1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187

//! Token types

use std::convert::TryFrom;

use bounded_vec::OptBoundedVecToVec;
use ergo_lib::ergo_chain_types::Base16DecodedBytes;
use ergo_lib::ergo_chain_types::Digest32;
use ergo_lib::ergotree_ir::chain;
use gloo_utils::format::JsValueSerdeExt;
use js_sys::Uint8Array;
use wasm_bindgen::prelude::*;

use crate::ergo_box::BoxId;
use crate::error_conversion::to_js;
use crate::json::TokenJsonEip12;
use crate::utils::I64;

/// Token id (32 byte digest)
#[wasm_bindgen]
#[derive(PartialEq, Eq, Debug, Clone)]
pub struct TokenId(chain::token::TokenId);

#[wasm_bindgen]
impl TokenId {
    /// Create token id from ergo box id (32 byte digest)
    pub fn from_box_id(box_id: &BoxId) -> TokenId {
        let box_id: chain::ergo_box::BoxId = box_id.clone().into();
        TokenId(chain::token::TokenId::from(box_id))
    }

    /// Parse token id (32 byte digest) from base16-encoded string
    #[allow(clippy::should_implement_trait)]
    pub fn from_str(str: &str) -> Result<TokenId, JsValue> {
        Base16DecodedBytes::try_from(str.to_string())
            .map_err(to_js)
            .and_then(|bytes| Digest32::try_from(bytes).map_err(to_js))
            .map(|dig| dig.into())
            .map(TokenId)
    }

    /// Base16 encoded string
    pub fn to_str(&self) -> String {
        self.0.into()
    }

    /// Returns byte array (32 bytes)
    pub fn as_bytes(&self) -> Uint8Array {
        Uint8Array::from(self.0.as_ref())
    }
}

impl From<TokenId> for chain::token::TokenId {
    fn from(t_id: TokenId) -> Self {
        t_id.0
    }
}

/// Token amount with bound checks
#[wasm_bindgen]
#[derive(PartialEq, Eq, Debug, Clone)]
pub struct TokenAmount(chain::token::TokenAmount);

#[wasm_bindgen]
impl TokenAmount {
    /// Create from i64 with bounds check
    pub fn from_i64(v: &I64) -> Result<TokenAmount, JsValue> {
        Ok(Self(
            chain::token::TokenAmount::try_from(i64::from(v.clone()) as u64).map_err(to_js)?,
        ))
    }

    /// Get value as signed 64-bit long (I64)
    pub fn as_i64(&self) -> I64 {
        i64::from(self.0).into()
    }

    /// big-endian byte array representation
    pub fn to_bytes(&self) -> Vec<u8> {
        self.0.as_u64().to_be_bytes().to_vec()
    }
}

impl From<TokenAmount> for chain::token::TokenAmount {
    fn from(ta: TokenAmount) -> Self {
        ta.0
    }
}

/// Token represented with token id paired with it's amount
#[wasm_bindgen]
#[derive(PartialEq, Eq, Debug, Clone)]
pub struct Token(chain::token::Token);

#[wasm_bindgen]
impl Token {
    /// Create a token with given token id and amount
    #[wasm_bindgen(constructor)]
    pub fn new(token_id: &TokenId, amount: &TokenAmount) -> Self {
        Token(chain::token::Token {
            token_id: token_id.clone().into(),
            amount: amount.clone().into(),
        })
    }

    /// Get token id
    pub fn id(&self) -> TokenId {
        TokenId(self.0.token_id)
    }

    /// Get token amount
    pub fn amount(&self) -> TokenAmount {
        TokenAmount(self.0.amount)
    }

    /// JSON representation as text (compatible with Ergo Node/Explorer API, numbers are encoded as numbers)
    pub fn to_json(&self) -> Result<String, JsValue> {
        serde_json::to_string_pretty(&self.0.clone())
            .map_err(|e| JsValue::from_str(&format!("{}", e)))
    }

    /// JSON representation according to EIP-12 <https://github.com/ergoplatform/eips/pull/23>
    /// (similar to [`Self::to_json`], but as JS object with token amount encoding as string)
    pub fn to_js_eip12(&self) -> Result<JsValue, JsValue> {
        let t_dapp: TokenJsonEip12 = self.0.clone().into();
        <JsValue as JsValueSerdeExt>::from_serde(&t_dapp)
            .map_err(|e| JsValue::from_str(&format!("{}", e)))
    }
}

impl From<Token> for chain::token::Token {
    fn from(t: Token) -> Self {
        t.0
    }
}

impl From<chain::token::Token> for Token {
    fn from(t: chain::token::Token) -> Self {
        Self(t)
    }
}

/// Array of tokens
#[wasm_bindgen]
#[derive(PartialEq, Eq, Debug, Clone)]
pub struct Tokens(pub(crate) Vec<Token>);

#[wasm_bindgen]
impl Tokens {
    /// Create empty Tokens
    #[wasm_bindgen(constructor)]
    pub fn new() -> Self {
        Tokens(Vec::new())
    }

    /// Returns the number of elements in the collection
    pub fn len(&self) -> usize {
        self.0.len()
    }

    /// Returns the element of the collection with a given index
    pub fn get(&self, index: usize) -> Result<Token, JsValue> {
        self.0
            .get(index)
            .cloned()
            .ok_or_else(|| JsValue::from_str("Index out of bounds"))
    }

    /// Adds an elements to the collection
    pub fn add(&mut self, elem: &Token) {
        self.0.push(elem.clone());
    }
}

impl TryFrom<Tokens> for Option<chain::ergo_box::BoxTokens> {
    type Error = JsValue;

    fn try_from(tokens: Tokens) -> Result<Self, Self::Error> {
        chain::ergo_box::BoxTokens::opt_empty_vec(tokens.0.into_iter().map(Into::into).collect())
            .map_err(to_js)
    }
}

impl From<Option<chain::ergo_box::BoxTokens>> for Tokens {
    fn from(v: Option<chain::ergo_box::BoxTokens>) -> Self {
        Tokens(v.to_vec().into_iter().map(|t| t.into()).collect())
    }
}