From bc50e0e088b16980d8e744b4ee95ff5820b4832f Mon Sep 17 00:00:00 2001
From: Arthur Roberts <arfa.r@live.com>
Date: Thu, 11 Jul 2024 20:34:07 +0100
Subject: [PATCH] Initial Commit

---
 .gitignore |   1 +
 Cargo.lock | 290 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml |   9 ++
 src/lib.rs |  62 ++++++++++++
 4 files changed, 362 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/lib.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..6b9e5ef
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,290 @@
+# This file is automatically @generated by Cargo.
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..b019362
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "blockchain_time"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+chrono = "0.4.38"
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..615a2d1
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,62 @@
+use chrono::prelude::*;
+
+// TODO review whether a genesis block has a block height of 1 or 0
+
+type BlockHeight = i64;
+
+pub struct BlockchainBlockInfo {
+    block_period: u64, // in seconds maybe?
+
+    latest_block_height: BlockHeight,
+    latest_block_time: DateTime<Utc>,
+}
+
+pub fn time_to_blockheight(time: DateTime<Utc>, blockchain: BlockchainBlockInfo) -> BlockHeight {
+    let time_difference = (time - blockchain.latest_block_time).num_seconds();
+    let num_blocks = time_difference / blockchain.block_period as i64;
+    num_blocks + blockchain.latest_block_height
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn one_block_time_away() {
+        let latest_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 10, 0).unwrap();
+        let wanted_future_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 20, 1).unwrap();
+        let blockchain_info = BlockchainBlockInfo {
+            block_period: 60 * 10, // 10 minutes
+            latest_block_height: 1000,
+            latest_block_time,
+        };
+        let result = time_to_blockheight(wanted_future_block_time, blockchain_info);
+        assert_eq!(result, 1001);
+    }
+
+    #[test]
+    fn one_block_time_previous() {
+        let latest_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 20, 1).unwrap();
+        let wanted_future_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 10, 0).unwrap();
+        let blockchain_info = BlockchainBlockInfo {
+            block_period: 60 * 10, // 10 minutes
+            latest_block_height: 1000,
+            latest_block_time,
+        };
+        let result = time_to_blockheight(wanted_future_block_time, blockchain_info);
+        assert_eq!(result, 999);
+    }
+
+    #[test]
+    fn negative_block_time() {
+        let latest_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 30, 0).unwrap();
+        let wanted_negative_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 10, 0).unwrap();
+        let blockchain_info = BlockchainBlockInfo {
+            block_period: 60 * 10, // 10 minutes
+            latest_block_height: 1,
+            latest_block_time,
+        };
+        let result = time_to_blockheight(wanted_negative_block_time, blockchain_info);
+        assert_eq!(result, -1);
+    }
+}