"""Tests for the CLI module."""

import sys
from pathlib import Path

from click.testing import CliRunner

sys.path.insert(0, str(Path(__file__).parent.parent / 'src'))

from gdiffer.cli import main


class TestCLIMain:
    """Tests for the main CLI command."""

    def test_main_help(self):
        """Test that --help works."""
        runner = CliRunner()
        result = runner.invoke(main, ["--help"])
        assert result.exit_code == 0
        assert "Git Diff Explainer" in result.output or "diff" in result.output.lower()

    def test_main_version(self):
        """Test that --version works."""
        runner = CliRunner()
        result = runner.invoke(main, ["--version"])
        assert result.exit_code == 0
        assert "0.1.0" in result.output


class TestExplainCommand:
    """Tests for the explain command."""

    def test_explain_simple_diff(self):
        """Test explaining a simple diff."""
        diff = """diff --git a/test.py b/test.py
index 123..456 100644
--- a/test.py
+++ b/test.py
@@ -1,3 +1,3 @@
-def hello():
-    print("Hello")
+def hello():
+    print("Hello, World!")
"""
        runner = CliRunner()
        result = runner.invoke(main, ["explain", diff])
        assert result.exit_code == 0
        assert "test.py" in result.output or "Files" in result.output

    def test_explain_no_input(self):
        """Test explaining with no input shows error."""
        runner = CliRunner()
        result = runner.invoke(main, ["explain"])
        assert result.exit_code != 0

    def test_explain_invalid_diff(self):
        """Test explaining an invalid diff."""
        runner = CliRunner()
        result = runner.invoke(main, ["explain", "not a valid diff"])
        assert result.exit_code != 0

    def test_explain_json_format(self):
        """Test explaining in JSON format."""
        diff = """diff --git a/test.py b/test.py
new file mode 100644
--- /dev/null
+++ b/test.py
@@ -0,0 +1 @@
+print("hello")
"""
        runner = CliRunner()
        result = runner.invoke(main, ["--output", "json", "explain", diff])
        assert result.exit_code == 0
        assert "{" in result.output

    def test_explain_plain_format(self):
        """Test explaining in plain text format."""
        diff = """diff --git a/test.py b/test.py
--- a/test.py
+++ b/test.py
@@ -1 +1 @@
-old
+new
"""
        runner = CliRunner()
        result = runner.invoke(main, ["--output", "plain", "explain", diff])
        assert result.exit_code == 0


class TestIssuesCommand:
    """Tests for the issues command."""

    def test_issues_with_security_issue(self):
        """Test detecting security issues."""
        diff = """diff --git a/db.py b/db.py
--- a/db.py
+++ b/db.py
@@ -1,2 +1,3 @@
 def get_user(username):
     query = "SELECT * FROM users WHERE name = '" + username + "'"
+    query = "SELECT * FROM users WHERE id = " + user_id
"""
        runner = CliRunner()
        result = runner.invoke(main, ["issues"], input=diff)
        assert result.exit_code == 0


class TestSummarizeCommand:
    """Tests for the summarize command."""

    def test_summarize_simple_diff(self):
        """Test summarizing a simple diff."""
        diff = """diff --git a/test.py b/test.py
--- a/test.py
+++ b/test.py
@@ -1 +1 @@
-old
+new
"""
        runner = CliRunner()
        result = runner.invoke(main, ["summarize"], input=diff)
        assert result.exit_code == 0
        assert "Files" in result.output or "changed" in result.output.lower()

    def test_summarize_multi_file(self):
        """Test summarizing multi-file diff."""
        diff = """diff --git a/file1.py b/file1.py
new file mode 100644
--- /dev/null
+++ b/file1.py
@@ -0,0 +1 @@
+print(1)

diff --git a/file2.py b/file2.py
deleted file mode 100644
--- a/file2.py
+++ /dev/null
@@ -1 +0,0 @@
-print(2)
"""
        runner = CliRunner()
        result = runner.invoke(main, ["summarize"], input=diff)
        assert result.exit_code == 0


class TestCLIOptions:
    """Tests for CLI options."""

    def test_verbose_option(self):
        """Test verbose output option."""
        diff = """diff --git a/test.py b/test.py
--- a/test.py
+++ b/test.py
@@ -1 +1 @@
-old
+new
"""
        runner = CliRunner()
        result = runner.invoke(main, ["--verbose", "explain", diff])
        assert result.exit_code == 0

    def test_output_format_option(self):
        """Test output format option."""
        diff = """diff --git a/test.py b/test.py
--- a/test.py
+++ b/test.py
@@ -1 +1 @@
-old
+new
"""
        for fmt in ["terminal", "json", "plain"]:
            runner = CliRunner()
            result = runner.invoke(main, ["--output", fmt, "explain", diff])
            assert result.exit_code == 0