import sys
import tkinter as tk
from contextlib import ExitStack
from pathlib import Path
from unittest.mock import patch, MagicMock

import pytest


class MockVar:
    def __init__(self, value=None):
        self.value = value
    def get(self):
        return self.value
    def set(self, value):
        self.value = value
    def trace_add(self, mode, callback):
        pass

# Mock tkinter and other GUI/macOS specific imports
# We use patch.dict to avoid polluting other tests if possible, 
# but sys.modules is global. 
# Better: just use patch in the fixture.
sys.modules["Foundation"] = MagicMock()
sys.modules["AppKit"] = MagicMock()
sys.modules["PIL"] = MagicMock()
sys.modules["PIL.Image"] = MagicMock()
sys.modules["PIL.ImageTk"] = MagicMock()

from install import KnoeInstaller


def _generated_dockerfile_path(installer, tmp_path):
    return tmp_path / "build" / installer._db_mode_key() / "knoe-db" / "Dockerfile"

@pytest.fixture
def mock_installer(tmp_path):
    root = MagicMock()
    
    # We need to patch the tk references in the modules that use them,
    # because they might have already been imported with a different mock.
    patches = [
        patch("knoe.ui.screens.PROJECT_ROOT", tmp_path),
        patch("knoe.ui.screens.database_options.PROJECT_ROOT", tmp_path),
        patch("knoe.ui.screens.database_options.resolve_knoe_home", return_value=tmp_path),
        patch("knoe.ui.screens.database_options.get_resource_path", side_effect=lambda name: tmp_path / name),
        patch("knoe.core.controller.KnoeController.run_script"),
        patch.object(KnoeInstaller, "_load_database_versions"),
        patch("knoe.ui.screens.database_options.tk.BooleanVar", side_effect=lambda value=None: MockVar(value)),
        patch("knoe.ui.screens.database_options.tk.StringVar", side_effect=lambda value=None: MockVar(value)),
        patch("knoe.ui.screens.database_options.copy_build_context_dir", side_effect=lambda src, dst: dst.mkdir(parents=True, exist_ok=True)),
        patch("knoe.ui.screens.database_options.tk.ttk.Treeview"),
        patch("knoe.ui.screens.database_options.tk.ttk.Scrollbar"),
        patch("knoe.ui.screens.database_options.tk.ttk.Combobox"),
        patch("knoe.ui.screens.database_options.tk.Radiobutton"),
        patch("knoe.ui.screens.database_options.tk.Checkbutton"),
        patch("knoe.ui.screens.database_options.tk.Label"),
        # Also for the main class if it uses them
        patch("knoe.ui.screens.tk.BooleanVar", side_effect=lambda value=None: MockVar(value)),
        patch("knoe.ui.screens.tk.StringVar", side_effect=lambda value=None: MockVar(value)),
    ]
    
    with ExitStack() as stack:
        for p in patches:
            stack.enter_context(p)
        
        # Create necessary directories
        (tmp_path / "knoe-db").mkdir()
        (tmp_path / "conf" / "postgresql").mkdir(parents=True)
        (tmp_path / "etc").mkdir()
        
        app = KnoeInstaller(root)
        app.bg_canvas = MagicMock()
        app.root = root
        # Force knoe_home to tmp_path so _runtime_knoe_home() returns tmp_path.
        app.knoe_cfg_data.setdefault("System Environment", {})["KNOE_HOME"] = str(tmp_path)
        yield app

def test_database_options_state_init(mock_installer):
    assert hasattr(mock_installer, "db_at_rest_encryption")
    assert mock_installer.db_at_rest_encryption.get() is True
    assert mock_installer.db_distribution.get() == "percona"
    # Default is Percona 18
    assert mock_installer.db_version_type.get() == "v18"
    assert "pg_cron" in mock_installer.db_extensions
    assert "pg_tde" in mock_installer.db_extensions
    assert mock_installer.db_extensions["pg_cron"].get() is True
    assert mock_installer.db_extensions["pg_tde"].get() is True

def test_encryption_toggle(mock_installer):
    # Initial state: Encryption ON -> Percona
    assert mock_installer.db_at_rest_encryption.get() is True
    assert mock_installer.db_distribution.get() == "percona"
    
    # Toggle OFF -> should switch to postgresql
    mock_installer.db_at_rest_encryption.set(False)
    # We need to manually call the command since we're setting the variable directly in test
    # In real UI, the command=on_encryption_toggle would handle it.
    
    # Find the encryption toggle callback (it's local to _render_database_options_page but let's see)
    # Actually it might be easier to just test the logic if I can access it.
    
    # Let's mock the render to get the callback
    with patch("knoe.ui.screens.database_options.tk.Checkbutton") as mock_cb:
        mock_installer._render_database_options_page()
        args, kwargs = mock_cb.call_args
        on_encryption_toggle = kwargs["command"]
        
        mock_installer.db_at_rest_encryption.set(False)
        on_encryption_toggle()
        assert mock_installer.db_distribution.get() == "postgresql"
        
        mock_installer.db_at_rest_encryption.set(True)
        on_encryption_toggle()
        assert mock_installer.db_distribution.get() == "percona"

def test_version_selection(mock_installer):
    mock_installer.db_versions_data = {
        "postgresql": {"stable": "14", "current": "15", "latest": "16"},
        "percona": {"stable": "15", "current": "16", "latest": "17", "v18": "18"}
    }
    
    mock_installer.db_distribution.set("percona")
    mock_installer._render_database_options_page()
    
    # Initially it should be Latest
    mock_installer._refresh_database_options_ui()
    assert mock_installer.db_selected_version.get() == "18 (Percona 18)"
    
    # Test switching to stable
    mock_installer.db_selected_version.set("15") # simulate partial string match or manual set
    mock_installer._refresh_database_options_ui()
    assert mock_installer.db_selected_version.get() == "15 (Stable)"

def test_dockerfile_generation(mock_installer, tmp_path):
    mock_installer.db_distribution.set("percona")
    mock_installer.db_selected_version.set("17 (Latest)")
    
    template_path = tmp_path / "knoe-db" / "Dockerfile.percona.template"
    template_path.write_text("FROM percona:{{MAJOR_VERSION}}\n{{EXTENSION_INSTALL_STEPS}}\n{{EXTENSION_CREATE_STEPS}}")
    
    for ext in mock_installer.db_extensions.values():
        ext.set(False)
    mock_installer.db_extensions["postgis"].set(True)
    
    success = mock_installer._generate_knoe_db_dockerfile()
    assert success is True
    
    dockerfile = _generated_dockerfile_path(mock_installer, tmp_path)
    assert dockerfile.exists()
    content = dockerfile.read_text()
    assert "FROM percona:17" in content
    assert "percona-postgresql-17-postgis-3" in content
    assert "CREATE EXTENSION IF NOT EXISTS postgis SCHEMA knoe;" in content
    assert "ALTER EXTENSION postgis SET SCHEMA knoe" in content
    assert "vector" not in content

def test_dockerfile_generation_percona_18(mock_installer, tmp_path):
    mock_installer.db_distribution.set("percona")
    mock_installer.db_selected_version.set("18 (Latest)")
    
    template_path = tmp_path / "knoe-db" / "Dockerfile.percona.template"
    template_path.write_text("FROM percona:{{MAJOR_VERSION}}\n{{EXTENSION_INSTALL_STEPS}}\n{{EXTENSION_CREATE_STEPS}}")
    
    # Enable a contrib extension
    mock_installer.db_extensions["pgcrypto"].set(True)
    # Enable a separate package extension
    mock_installer.db_extensions["pg_repack"].set(True)
    # Enable pgvector (verify name 'vector')
    mock_installer.db_extensions["pgvector"].set(True)
    
    success = mock_installer._generate_knoe_db_dockerfile()
    assert success is True
    
    dockerfile = _generated_dockerfile_path(mock_installer, tmp_path)
    content = dockerfile.read_text()
    
    assert "FROM percona:18" in content
    # pgcrypto should NOT have an apt-get install line because it's in contrib
    assert "percona-postgresql-18-pgcrypto" not in content
    # pg_repack should use 'repack' instead of 'pg_repack' for Percona
    assert "percona-postgresql-18-repack" in content
    # pgvector should use 'pgvector' for package
    assert "percona-postgresql-18-pgvector" in content
    # Percona build flow should not install non-existent cron package variants
    assert "percona-postgresql-18-cron" not in content
    assert "percona-postgresql-18-pg_cron" not in content
    # pg_tde is handled by dedicated Percona package naming and must not use generic mapping
    assert "percona-postgresql-18-pg_tde" not in content
    
    # SQL creation steps
    assert "CREATE EXTENSION IF NOT EXISTS pgcrypto;" in content
    assert "CREATE EXTENSION IF NOT EXISTS pg_repack;" in content
    assert "CREATE EXTENSION IF NOT EXISTS vector;" in content
    assert "CREATE EXTENSION IF NOT EXISTS pg_cron;" in content


def test_pg_cron_package_mapping_for_postgresql(mock_installer, tmp_path):
    mock_installer.db_distribution.set("postgresql")
    mock_installer.db_selected_version.set("17 (Latest)")

    template_path = tmp_path / "knoe-db" / "Dockerfile.postgresql.template"
    template_path.write_text("FROM postgres:{{MAJOR_VERSION}}\n{{EXTENSION_INSTALL_STEPS}}\n{{EXTENSION_CREATE_STEPS}}")

    # Keep scenario focused on pg_cron mapping
    for ext in mock_installer.db_extensions.values():
        ext.set(False)
    mock_installer.db_extensions["pg_cron"].set(True)

    success = mock_installer._generate_knoe_db_dockerfile()
    assert success is True

    dockerfile = _generated_dockerfile_path(mock_installer, tmp_path)
    content = dockerfile.read_text()

    assert "postgresql-17-cron" in content
    assert "postgresql-17-pg_cron" not in content

def test_pgbadger_handling(mock_installer, tmp_path):
    mock_installer.db_distribution.set("percona")
    mock_installer.db_selected_version.set("18")
    
    template_path = tmp_path / "knoe-db" / "Dockerfile.percona.template"
    template_path.write_text("{{EXTENSION_INSTALL_STEPS}}\n{{EXTENSION_CREATE_STEPS}}")
    
    for ext in mock_installer.db_extensions.values():
        ext.set(False)
    mock_installer.db_extensions["pgbadger"].set(True)
    
    success = mock_installer._generate_knoe_db_dockerfile()
    assert success is True
    
    dockerfile = _generated_dockerfile_path(mock_installer, tmp_path)
    content = dockerfile.read_text()
    
    assert "apt-get install -y --no-install-recommends percona-pgbadger" in content
    assert "CREATE EXTENSION IF NOT EXISTS pgbadger" not in content