# secret_manager.py
#
# Copyright 2025 Pavel Baksy
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#
# SPDX-License-Identifier: GPL-3.0-or-later

"""
Manager for storing and retrieving sensitive variable values using GNOME Keyring.

This module provides a clean interface to libsecret for storing environment
variable values that contain sensitive data (API keys, passwords, tokens).

Each secret is identified by:
- project_id: UUID of the project
- environment_id: UUID of the environment
- variable_name: Name of the variable
"""

import gi
gi.require_version('Secret', '1')
from gi.repository import Secret, GLib
import logging

logger = logging.getLogger(__name__)

# Define schema for Roster environment variables
# This separates them from other secrets in GNOME Keyring
ROSTER_SCHEMA = Secret.Schema.new(
    "cz.bugsy.roster.EnvironmentVariable",
    Secret.SchemaFlags.NONE,
    {
        "project_id": Secret.SchemaAttributeType.STRING,
        "environment_id": Secret.SchemaAttributeType.STRING,
        "variable_name": Secret.SchemaAttributeType.STRING,
    }
)


class SecretManager:
    """Manages sensitive variable storage using GNOME Keyring via libsecret."""

    def __init__(self):
        """Initialize the secret manager."""
        self.schema = ROSTER_SCHEMA

    def store_secret(self, project_id: str, environment_id: str,
                     variable_name: str, value: str, project_name: str = "",
                     environment_name: str = "") -> bool:
        """
        Store a sensitive variable value in GNOME Keyring.

        Args:
            project_id: UUID of the project
            environment_id: UUID of the environment
            variable_name: Name of the variable
            value: The secret value to store
            project_name: Optional human-readable project name (for display in Seahorse)
            environment_name: Optional human-readable environment name (for display)

        Returns:
            True if successful, False otherwise
        """
        # Create a descriptive label for the keyring UI
        label = f"Roster: {project_name}/{environment_name}/{variable_name}" if project_name else \
                f"Roster Variable: {variable_name}"

        # Build attributes dictionary for the secret
        attributes = {
            "project_id": project_id,
            "environment_id": environment_id,
            "variable_name": variable_name,
        }

        try:
            # Store the secret synchronously
            # Using PASSWORD collection (default keyring)
            Secret.password_store_sync(
                self.schema,
                attributes,
                Secret.COLLECTION_DEFAULT,
                label,
                value,
                None  # cancellable
            )
            logger.info(f"Stored secret for {variable_name} in {environment_id}")
            return True

        except GLib.Error as e:
            logger.error(f"Failed to store secret: {e.message}")
            return False

    def retrieve_secret(self, project_id: str, environment_id: str,
                        variable_name: str) -> str | None:
        """
        Retrieve a sensitive variable value from GNOME Keyring.

        Args:
            project_id: UUID of the project
            environment_id: UUID of the environment
            variable_name: Name of the variable

        Returns:
            The secret value if found, None otherwise
        """
        attributes = {
            "project_id": project_id,
            "environment_id": environment_id,
            "variable_name": variable_name,
        }

        try:
            # Retrieve the secret synchronously
            value = Secret.password_lookup_sync(
                self.schema,
                attributes,
                None  # cancellable
            )

            if value is None:
                logger.debug(f"No secret found for {variable_name}")
            else:
                logger.debug(f"Retrieved secret for {variable_name}")

            return value

        except GLib.Error as e:
            logger.error(f"Failed to retrieve secret: {e.message}")
            return None

    def delete_secret(self, project_id: str, environment_id: str,
                      variable_name: str) -> bool:
        """
        Delete a sensitive variable value from GNOME Keyring.

        Args:
            project_id: UUID of the project
            environment_id: UUID of the environment
            variable_name: Name of the variable

        Returns:
            True if deleted (or didn't exist), False on error
        """
        attributes = {
            "project_id": project_id,
            "environment_id": environment_id,
            "variable_name": variable_name,
        }

        try:
            # Delete the secret synchronously
            deleted = Secret.password_clear_sync(
                self.schema,
                attributes,
                None  # cancellable
            )

            if deleted:
                logger.info(f"Deleted secret for {variable_name}")
            else:
                logger.debug(f"No secret to delete for {variable_name}")

            return True

        except GLib.Error as e:
            logger.error(f"Failed to delete secret: {e.message}")
            return False

    def delete_all_project_secrets(self, project_id: str) -> bool:
        """
        Delete all secrets for a project (when project is deleted).

        Args:
            project_id: UUID of the project

        Returns:
            True if successful, False otherwise
        """
        attributes = {
            "project_id": project_id,
        }

        try:
            # Delete all matching secrets
            deleted = Secret.password_clear_sync(
                self.schema,
                attributes,
                None
            )

            logger.info(f"Deleted all secrets for project {project_id}")
            return True

        except GLib.Error as e:
            logger.error(f"Failed to delete project secrets: {e.message}")
            return False

    def delete_all_environment_secrets(self, project_id: str, environment_id: str) -> bool:
        """
        Delete all secrets for an environment (when environment is deleted).

        Args:
            project_id: UUID of the project
            environment_id: UUID of the environment

        Returns:
            True if successful, False otherwise
        """
        attributes = {
            "project_id": project_id,
            "environment_id": environment_id,
        }

        try:
            deleted = Secret.password_clear_sync(
                self.schema,
                attributes,
                None
            )

            logger.info(f"Deleted all secrets for environment {environment_id}")
            return True

        except GLib.Error as e:
            logger.error(f"Failed to delete environment secrets: {e.message}")
            return False

    def rename_variable_secrets(self, project_id: str, old_name: str, new_name: str) -> bool:
        """
        Rename a variable across all environments (updates secret keys).

        This is called when a variable is renamed. We need to:
        1. Find all secrets with old_name
        2. Store them with new_name
        3. Delete old secrets

        Args:
            project_id: UUID of the project
            old_name: Current variable name
            new_name: New variable name

        Returns:
            True if successful, False otherwise
        """
        # Search for all secrets with the old variable name
        attributes = {
            "project_id": project_id,
            "variable_name": old_name,
        }

        try:
            # Search for matching secrets
            # This returns a list of Secret.Item objects
            secrets = Secret.password_search_sync(
                self.schema,
                attributes,
                Secret.SearchFlags.ALL,
                None
            )

            if not secrets:
                logger.debug(f"No secrets found for variable {old_name}")
                return True

            # For each secret, retrieve value, store with new name, delete old
            for item in secrets:
                # Get the secret value
                item.load_secret_sync(None)
                value = item.get_secret().get_text()

                # Get environment_id from attributes
                attrs = item.get_attributes()
                environment_id = attrs.get("environment_id")

                if not environment_id:
                    logger.warning(f"Secret missing environment_id, skipping")
                    continue

                # Store with new name
                self.store_secret(
                    project_id=project_id,
                    environment_id=environment_id,
                    variable_name=new_name,
                    value=value
                )

                # Delete old secret
                self.delete_secret(
                    project_id=project_id,
                    environment_id=environment_id,
                    variable_name=old_name
                )

            logger.info(f"Renamed variable secrets from {old_name} to {new_name}")
            return True

        except GLib.Error as e:
            logger.error(f"Failed to rename variable secrets: {e.message}")
            return False


# Singleton instance
_secret_manager = None

def get_secret_manager() -> SecretManager:
    """Get the global SecretManager instance."""
    global _secret_manager
    if _secret_manager is None:
        _secret_manager = SecretManager()
    return _secret_manager