import unittest
from patchman.utils.git_patch_parser.parser import parse_git_patch
from patchman.utils.git_patch_parser.models import GitPatch

class TestGitPatchParser(unittest.TestCase):
    def test_parse_valid_patch(self):
        patch_text = """From 0123456789abcdef1234567890abcdef12345678 Mon Sep 17 00:00:00 2001
From: Max Mustermann <max@example.com>
Date: Wed, 23 Jul 2025 12:34:56 +0200
Subject: [PATCH] Dein Patch-Titel

Dies ist eine Beschreibung des Patches.

diff --git a/file.txt b/file.txt
index 83db48f..f735c3b 100644
--- a/file.txt
+++ b/file.txt
@@ -1 +1 @@
-Hello World
+Hello Patchman
"""
        expected_patch = GitPatch(
            commit_hash="0123456789abcdef1234567890abcdef12345678",
            author="Max Mustermann <max@example.com>",
            date="Wed, 23 Jul 2025 12:34:56 +0200",
            subject="[PATCH] Dein Patch-Titel",
            description="Dies ist eine Beschreibung des Patches.",
            diff="diff --git a/file.txt b/file.txt\nindex 83db48f..f735c3b 100644\n--- a/file.txt\n+++ b/file.txt\n@@ -1 +1 @@\n-Hello World\n+Hello Patchman\n"
        )
        parsed_patch = parse_git_patch(patch_text)
        self.assertEqual(parsed_patch, expected_patch)

    def test_parse_invalid_patch(self):
        patch_text = "Invalid patch content"
        with self.assertRaises(ValueError) as context:
            parse_git_patch(patch_text)
        self.assertIn("Commit hash not found", str(context.exception))

    def test_parse_patch_missing_author(self):
        patch_text = """From 0123456789abcdef1234567890abcdef12345678 Mon Sep 17 00:00:00 2001
Date: Wed, 23 Jul 2025 12:34:56 +0200
Subject: [PATCH] Test"""
        with self.assertRaises(ValueError) as context:
            parse_git_patch(patch_text)
        self.assertIn("Author not found", str(context.exception))

    def test_parse_patch_missing_date(self):
        patch_text = """From 0123456789abcdef1234567890abcdef12345678 Mon Sep 17 00:00:00 2001
From: Test Author <test@example.com>
Subject: [PATCH] Test"""
        with self.assertRaises(ValueError) as context:
            parse_git_patch(patch_text)
        self.assertIn("Date not found", str(context.exception))

    def test_parse_patch_missing_subject(self):
        patch_text = """From 0123456789abcdef1234567890abcdef12345678 Mon Sep 17 00:00:00 2001
From: Test Author <test@example.com>
Date: Wed, 23 Jul 2025 12:34:56 +0200"""
        with self.assertRaises(ValueError) as context:
            parse_git_patch(patch_text)
        self.assertIn("Subject not found", str(context.exception))

    def test_parse_patch_without_description_and_diff(self):
        patch_text = """From 0123456789abcdef1234567890abcdef12345678 Mon Sep 17 00:00:00 2001
From: Test Author <test@example.com>
Date: Wed, 23 Jul 2025 12:34:56 +0200
Subject: [PATCH] Minimal patch"""
        
        parsed_patch = parse_git_patch(patch_text)
        self.assertEqual(parsed_patch.commit_hash, "0123456789abcdef1234567890abcdef12345678")
        self.assertEqual(parsed_patch.author, "Test Author <test@example.com>")
        self.assertEqual(parsed_patch.date, "Wed, 23 Jul 2025 12:34:56 +0200")
        self.assertEqual(parsed_patch.subject, "[PATCH] Minimal patch")
        self.assertEqual(parsed_patch.description, "")
        self.assertEqual(parsed_patch.diff, "")

if __name__ == '__main__':
    unittest.main()