From 9620fdb1164128e09b9eb678793929dd61f9936f Mon Sep 17 00:00:00 2001
From: Arthur Roberts <arfa.r@live.com>
Date: Sat, 13 Jul 2024 19:26:44 +0100
Subject: [PATCH] Moved creation of the blockchain infos to a static context

---
 Cargo.lock |  7 ++++++
 Cargo.toml |  1 +
 src/lib.rs | 62 +++++++++++++++++++++++++++++++-----------------------
 3 files changed, 44 insertions(+), 26 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 6b9e5ef..efdd565 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -28,6 +28,7 @@ name = "blockchain_time"
 version = "0.1.0"
 dependencies = [
  "chrono",
+ "lazy_static",
 ]
 
 [[package]]
@@ -100,6 +101,12 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "lazy_static"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+
 [[package]]
 name = "libc"
 version = "0.2.155"
diff --git a/Cargo.toml b/Cargo.toml
index b019362..ee6b955 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,3 +7,4 @@ edition = "2021"
 
 [dependencies]
 chrono = "0.4.38"
+lazy_static = "1.5.0"
diff --git a/src/lib.rs b/src/lib.rs
index 600f959..3eab8e4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,9 +1,9 @@
-use std::convert::Into;
 use chrono::prelude::*;
+use lazy_static::lazy_static;
+use std::convert::Into;
 
 // TODO review whether a genesis block has a block height of 1 or 0
 
-
 pub enum BlockchainSupported {
     BTC,
     BSV,
@@ -13,41 +13,51 @@ pub enum BlockchainSupported {
 
 type BlockHeight = i64;
 
+#[derive(Clone, Copy)]
 pub struct BlockchainInfo {
-    block_period: u64, // in seconds maybe?
-
+    block_period: u64, // In seconds
     latest_block_height: BlockHeight,
     latest_block_time: DateTime<Utc>,
 }
 
+lazy_static! {
+    static ref BSV_BI: BlockchainInfo = BlockchainInfo {
+        block_period: 10 * 60, // 10 minutes,
+        latest_block_height: 852792,
+        latest_block_time: Utc.with_ymd_and_hms(2024, 7, 11, 19, 53, 7).unwrap(),
+    };
+    static ref BTC_BI: BlockchainInfo = BlockchainInfo {
+        block_period: 10 * 60, // 10 minutes,
+        latest_block_height: 851724,
+        latest_block_time: Utc.with_ymd_and_hms(2024, 7, 11, 19, 38, 6).unwrap(),
+    };
+    static ref XMR_BI: BlockchainInfo = BlockchainInfo {
+        block_period: 2 * 60, // 2 minutes,
+        latest_block_height: 3190705,
+        latest_block_time: Utc.with_ymd_and_hms(2024, 7, 11, 19, 54, 11).unwrap(),
+    };
+    static ref ETH_BI: BlockchainInfo = BlockchainInfo {
+        block_period: 12,
+        latest_block_height: 20285486,
+        latest_block_time: Utc.with_ymd_and_hms(2024, 7, 11, 19, 53, 59).unwrap(),
+    };
+}
+
 impl From<BlockchainSupported> for BlockchainInfo {
-    fn from (val: BlockchainSupported) -> Self {
+    fn from(val: BlockchainSupported) -> Self {
         match val {
-            BlockchainSupported::BTC => BlockchainInfo {
-                block_period: 10 * 60, // 10 minutes,
-                latest_block_height: 851724,
-                latest_block_time: Utc.with_ymd_and_hms(2024, 7, 11, 19, 38, 6).unwrap(),
-            },
-            BlockchainSupported::BSV => BlockchainInfo {
-                block_period: 10 * 60, // 10 minutes,
-                latest_block_height: 852792,
-                latest_block_time: Utc.with_ymd_and_hms(2024, 7, 11, 19, 53, 7).unwrap(),
-            },
-            BlockchainSupported::XMR => BlockchainInfo {
-                block_period: 2 * 60, // 2 minutes,
-                latest_block_height: 3190705,
-                latest_block_time: Utc.with_ymd_and_hms(2024, 7, 11, 19, 54, 11).unwrap(),
-            },
-            BlockchainSupported::ETH => BlockchainInfo {
-                block_period: 12, // TODO investigate what the story is here... I don't think it's as simple as 12
-                latest_block_height: 20285486,
-                latest_block_time: Utc.with_ymd_and_hms(2024, 7, 11, 19, 53, 59).unwrap(),
-            },
+            BlockchainSupported::BTC => *BTC_BI,
+            BlockchainSupported::BSV => *BSV_BI,
+            BlockchainSupported::XMR => *XMR_BI,
+            BlockchainSupported::ETH => *ETH_BI,
         }
     }
 }
 
-pub fn time_to_blockheight_specific_chain(time: DateTime<Utc>, blockchain: BlockchainSupported) -> BlockHeight {
+pub fn time_to_blockheight_specific_chain(
+    time: DateTime<Utc>,
+    blockchain: BlockchainSupported,
+) -> BlockHeight {
     let bi: BlockchainInfo = blockchain.into();
     time_to_blockheight(time, bi)
 }