#!/usr/bin/env python3
"""Tests for scripts/diff_analyzer.py — 10 tests."""

import sys
import os
sys.path.insert(0, os.path.dirname(__file__) or ".")

import importlib.util
spec = importlib.util.spec_from_file_location("da", os.path.join(os.path.dirname(__file__) or ".", "diff_analyzer.py"))
mod = importlib.util.module_from_spec(spec)
spec.loader.exec_module(mod)
DiffAnalyzer = mod.DiffAnalyzer
ChangeCategory = mod.ChangeCategory


SAMPLE_ADD = """diff --git a/new.py b/new.py
new file mode 100644
--- /dev/null
+++ b/new.py
@@ -0,0 +1,3 @@
+def hello():
+    print("world")
+    return True
"""

SAMPLE_DELETE = """diff --git a/old.py b/old.py
deleted file mode 100644
--- a/old.py
+++ /dev/null
@@ -1,2 +0,0 @@
-def goodbye():
-    pass
"""

SAMPLE_MODIFY = """diff --git a/app.py b/app.py
--- a/app.py
+++ b/app.py
@@ -1,3 +1,4 @@
 def main():
-    print("old")
+    print("new")
+    print("extra")
     return 0
"""

SAMPLE_RENAME = """diff --git a/old_name.py b/new_name.py
rename from old_name.py
rename to new_name.py
--- a/old_name.py
+++ b/new_name.py
@@ -1,1 +1,1 @@
-old content
+new content
"""

SAMPLE_MULTI = """diff --git a/a.py b/a.py
--- a/a.py
+++ b/a.py
@@ -1,1 +1,2 @@
 existing
+added line
diff --git b/b.py b/b.py
new file mode 100644
--- /dev/null
+++ b/b.py
@@ -0,0 +1,1 @@
+new file
"""

SAMPLE_BINARY = """diff --git a/img.png b/img.png
Binary files a/img.png and b/img.png differ
"""


def test_empty():
    a = DiffAnalyzer()
    s = a.analyze("")
    assert s.total_files_changed == 0
    print("PASS: test_empty")

def test_addition():
    a = DiffAnalyzer()
    s = a.analyze(SAMPLE_ADD)
    assert s.total_files_changed == 1
    assert s.total_added == 3
    assert s.total_deleted == 0
    assert s.new_files == 1
    assert s.files[0].hunks[0].category == ChangeCategory.ADDED
    print("PASS: test_addition")

def test_deletion():
    a = DiffAnalyzer()
    s = a.analyze(SAMPLE_DELETE)
    assert s.total_deleted == 2
    assert s.deleted_files == 1
    assert s.files[0].hunks[0].category == ChangeCategory.DELETED
    print("PASS: test_deletion")

def test_modification():
    a = DiffAnalyzer()
    s = a.analyze(SAMPLE_MODIFY)
    assert s.total_added == 2
    assert s.total_deleted == 1
    assert s.files[0].hunks[0].category == ChangeCategory.MODIFIED
    print("PASS: test_modification")

def test_rename():
    a = DiffAnalyzer()
    s = a.analyze(SAMPLE_RENAME)
    assert s.renamed_files == 1
    assert s.files[0].old_path == "old_name.py"
    assert s.files[0].path == "new_name.py"
    assert s.files[0].is_renamed == True
    print("PASS: test_rename")

def test_multiple_files():
    a = DiffAnalyzer()
    s = a.analyze(SAMPLE_MULTI)
    assert s.total_files_changed == 2
    assert s.new_files == 1
    print("PASS: test_multiple_files")

def test_binary():
    a = DiffAnalyzer()
    s = a.analyze(SAMPLE_BINARY)
    assert s.binary_files == 1
    assert s.files[0].is_binary == True
    assert len(s.files[0].hunks) == 0
    print("PASS: test_binary")

def test_to_dict():
    a = DiffAnalyzer()
    s = a.analyze(SAMPLE_MODIFY)
    d = s.to_dict()
    assert "total_files_changed" in d
    assert "files" in d
    assert isinstance(d["files"], list)
    print("PASS: test_to_dict")

def test_context_only():
    diff = """diff --git a/f.py b/f.py
--- a/f.py
+++ b/f.py
@@ -1,3 +1,3 @@
 line1
-old
+new
 line3
"""
    a = DiffAnalyzer()
    s = a.analyze(diff)
    # Has both added and deleted = MODIFIED
    assert s.files[0].hunks[0].category == ChangeCategory.MODIFIED
    print("PASS: test_context_only")

def test_multi_hunk():
    diff = """diff --git a/f.py b/f.py
--- a/f.py
+++ b/f.py
@@ -1,1 +1,2 @@
 existing
+first addition
@@ -10,1 +11,2 @@
 more
+second addition
"""
    a = DiffAnalyzer()
    s = a.analyze(diff)
    assert s.total_hunks == 2
    assert s.total_added == 2
    print("PASS: test_multi_hunk")


def run_all():
    test_empty()
    test_addition()
    test_deletion()
    test_modification()
    test_rename()
    test_multiple_files()
    test_binary()
    test_to_dict()
    test_context_only()
    test_multi_hunk()
    print("\nAll 10 tests passed!")


if __name__ == "__main__":
    run_all()