From 2b223c0360fc2807ba2ca15aa4a45eb35836ea09 Mon Sep 17 00:00:00 2001
From: stanislas <stanislas@jouf.fr>
Date: Mon, 2 Dec 2024 22:12:10 +0100
Subject: [PATCH] day 2 - part 2

---
 src/aoc_2024/day2/input-data      | 1000 +++++++++++++++++++++++++++++
 src/aoc_2024/day2/part1.py        |   56 ++
 tests/aoc_2024/day1/test_first.py |    0
 tests/aoc_2024/day2/test-data     |    6 +
 tests/aoc_2024/day2/test-part1.py |   38 ++
 5 files changed, 1100 insertions(+)
 create mode 100644 src/aoc_2024/day2/input-data
 create mode 100644 src/aoc_2024/day2/part1.py
 delete mode 100644 tests/aoc_2024/day1/test_first.py
 create mode 100644 tests/aoc_2024/day2/test-data
 create mode 100644 tests/aoc_2024/day2/test-part1.py

diff --git a/src/aoc_2024/day2/input-data b/src/aoc_2024/day2/input-data
new file mode 100644
index 0000000..7d38374
--- /dev/null
+++ b/src/aoc_2024/day2/input-data
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\ No newline at end of file
diff --git a/src/aoc_2024/day2/part1.py b/src/aoc_2024/day2/part1.py
new file mode 100644
index 0000000..2c18059
--- /dev/null
+++ b/src/aoc_2024/day2/part1.py
@@ -0,0 +1,56 @@
+from pathlib import Path
+
+
+def is_report_safe(report: list[int]) -> bool:
+    try:
+        is_increasing = True
+        is_decreasing = True
+        for i in range(len(report)):
+            shift = report[i + 1] - report[i]
+            if shift == 0:
+                is_increasing = False
+                is_decreasing = False
+            if shift > 0:
+                is_decreasing = False
+            if shift < 0:
+                is_increasing = False
+
+            if not is_decreasing and not is_increasing:
+                return False
+
+            if abs(shift) > 3:
+                return False
+    except IndexError:
+        pass
+    return True
+
+
+def get_records(input_file: Path) -> list[list[int]]:
+    records = []
+    for line in input_file.open():
+        record = [int(i) for i in line.strip().split(" ")]
+        records.append(record)
+    return records
+
+
+def get_reports(input_file: Path) -> list[list[int]]:
+    reports = []
+    for line in input_file.open():
+        report = [int(r) for r in line.strip().split(" ")]
+        reports.append(report)
+    return reports
+
+
+def main(data_file: Path):
+    reports = get_reports(data_file)
+    score = 0
+    for report in reports:
+        if is_report_safe(report):
+            score += 1
+    print(score)
+    return score
+
+
+if __name__ == "__main__":
+    file = Path(__file__).parent / "input-data"
+    main(file)
diff --git a/tests/aoc_2024/day1/test_first.py b/tests/aoc_2024/day1/test_first.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/aoc_2024/day2/test-data b/tests/aoc_2024/day2/test-data
new file mode 100644
index 0000000..82cd679
--- /dev/null
+++ b/tests/aoc_2024/day2/test-data
@@ -0,0 +1,6 @@
+7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9
\ No newline at end of file
diff --git a/tests/aoc_2024/day2/test-part1.py b/tests/aoc_2024/day2/test-part1.py
new file mode 100644
index 0000000..39ea95b
--- /dev/null
+++ b/tests/aoc_2024/day2/test-part1.py
@@ -0,0 +1,38 @@
+from pathlib import Path
+
+from aoc_2024.day2 import part1
+
+
+def test_report_with_decreasing_levels_less_than_3_is_safe():
+    report = [7, 6, 4, 2, 1]
+    assert part1.is_report_safe(report)
+
+
+def test_report_with_decreasing_levels_more_than_3_is_not_safe():
+    report = [9, 7, 6, 2, 1]
+    assert not part1.is_report_safe(report)
+
+
+def test_report_without_increasing_or_decreasing_levels_is_not_safe():
+    report = [8, 6, 4, 4, 1]
+    assert not part1.is_report_safe(report)
+
+
+def test_report_with_increasing_and_decreasing_levels_is_not_safe():
+    report = [1, 3, 2, 4, 5]
+    assert not part1.is_report_safe(report)
+
+
+def test_report_with_increasing_levels_less_than_3_is_safe():
+    report = [1, 3, 6, 7, 9]
+    assert part1.is_report_safe(report)
+
+
+def test_report_with_increasing_levels_more_than_3_is_not_safe():
+    report = [1, 2, 7, 8, 9]
+    assert not part1.is_report_safe(report)
+
+
+def test_read_records_file():
+    test_file = Path(__file__).parent / "test-data"
+    assert part1.main(test_file) == 2