#!/usr/bin/env python3
'''
## Connection manager

Connpy is a connection manager that allows you to store nodes to connect them fast and password free.

### Features
    - You can generate profiles and reference them from nodes using @profilename so you dont
      need to edit multiple nodes when changing password or other information.
    - Nodes can be stored on @folder or @subfolder@folder to organize your devices. Then can 
      be referenced using node@subfolder@folder or node@folder
    - If you have too many nodes. Get completion script using: conn config --completion.
      Or use fzf installing pyfzf and running conn config --fzf true
    - Create in bulk, copy, move, export and import nodes for easy management.
    - Run automation scripts in network devices.
    - use GPT AI to help you manage your devices.
    - Add plugins with your own scripts.
    - Much more!

### Usage
```
usage: conn [-h] [--add | --del | --mod | --show | --debug] [node|folder] [--sftp]
       conn {profile,move,mv,copy,cp,list,ls,bulk,export,import,ai,run,api,plugin,config} ...

positional arguments:
  node|folder    node[@subfolder][@folder]
                 Connect to specific node or show all matching nodes
                 [@subfolder][@folder]
                 Show all available connections globaly or in specified path
Options:
  -h, --help         show this help message and exit
  -v, --version      Show version
  -a, --add          Add new node[@subfolder][@folder] or [@subfolder]@folder
  -r, --del, --rm    Delete node[@subfolder][@folder] or [@subfolder]@folder
  -e, --mod, --edit  Modify node[@subfolder][@folder]
  -s, --show         Show node[@subfolder][@folder]
  -d, --debug        Display all conections steps
  -t, --sftp         Connects using sftp instead of ssh

Commands:
  profile         Manage profiles
  move(mv)        Move node
  copy(cp)        Copy node
  list(ls)        List profiles, nodes or folders
  bulk            Add nodes in bulk
  export          Export connection folder to Yaml file
  import          Import connection folder to config from Yaml file
  ai              Make request to an AI
  run             Run scripts or commands on nodes
  api             Start and stop connpy api
  plugin          Manage plugins
  config          Manage app config
  sync            Sync config with Google
```

###   Manage profiles
```
usage: conn profile [-h] (--add | --del | --mod | --show) profile

positional arguments:
  profile        Name of profile to manage

options:
  -h, --help         show this help message and exit
  -a, --add          Add new profile
  -r, --del, --rm    Delete profile
  -e, --mod, --edit  Modify profile
  -s, --show         Show profile

```

###   Examples
```
   conn profile --add office-user
   conn --add @office
   conn --add @datacenter@office
   conn --add server@datacenter@office
   conn --add pc@office
   conn --show server@datacenter@office
   conn pc@office
   conn server
``` 
## Plugin Requirements for Connpy
### General Structure
- The plugin script must be a Python file.
- Only the following top-level elements are allowed in the plugin script:
  - Class definitions
  - Function definitions
  - Import statements
  - The `if __name__ == "__main__":` block for standalone execution
  - Pass statements

### Specific Class Requirements
- The plugin script must define specific classes with particular attributes and methods. Each class serves a distinct role within the plugin's architecture:
  1. **Class `Parser`**:
     - **Purpose**: Handles parsing of command-line arguments.
     - **Requirements**:
       - Must contain only one method: `__init__`.
       - The `__init__` method must initialize at least two attributes:
         - `self.parser`: An instance of `argparse.ArgumentParser`.
         - `self.description`: A string containing the description of the parser.
  2. **Class `Entrypoint`**:
     - **Purpose**: Acts as the entry point for plugin execution, utilizing parsed arguments and integrating with the main application.
     - **Requirements**:
       - Must have an `__init__` method that accepts exactly three parameters besides `self`:
         - `args`: Arguments passed to the plugin.
         - The parser instance (typically `self.parser` from the `Parser` class).
         - The Connapp instance to interact with the Connpy app.
  3. **Class `Preload`**:
     - **Purpose**: Performs any necessary preliminary setup or configuration independent of the main parsing and entry logic.
   - **Requirements**:
     - Contains at least an `__init__` method that accepts parameter connapp besides `self`.

### Class Dependencies and Combinations
- **Dependencies**:
  - `Parser` and `Entrypoint` are interdependent and must both be present if one is included.
  - `Preload` is independent and may exist alone or alongside the other classes.
- **Valid Combinations**:
  - `Parser` and `Entrypoint` together.
  - `Preload` alone.
  - All three classes (`Parser`, `Entrypoint`, `Preload`).

### Preload Modifications and Hooks

In the `Preload` class of the plugin system, you have the ability to customize the behavior of existing classes and methods within the application through a robust hooking system. This documentation explains how to use the `modify`, `register_pre_hook`, and `register_post_hook` methods to tailor plugin functionality to your needs.

#### Modifying Classes with `modify`
The `modify` method allows you to alter instances of a class at the time they are created or after their creation. This is particularly useful for setting or modifying configuration settings, altering default behaviors, or adding new functionalities to existing classes without changing the original class definitions.

- **Usage**: Modify a class to include additional configurations or changes
- **Modify Method Signature**:
  - `modify(modification_method)`: A function that is invoked with an instance of the class as its argument. This function should perform any modifications directly on this instance.
- **Modification Method Signature**:
  - **Arguments**:
    - `cls`:  This function accepts a single argument, the class instance, which it then modifies.
  - **Modifiable Classes**:
    - `connapp.config`
    - `connapp.node`
    - `connapp.nodes`
    - `connapp.ai`
  - ```python
    def modify_config(cls):
        # Example modification: adding a new attribute or modifying an existing one
        cls.new_attribute = 'New Value'

    class Preload:
        def __init__(self, connapp):
            # Applying modification to the config class instance
            connapp.config.modify(modify_config)
    ```

#### Implementing Hooks with `register_pre_hook` and `register_post_hook`
These methods allow you to define custom logic to be executed before (`register_pre_hook`) or after (`register_post_hook`) the main logic of a method. This is particularly useful for logging, auditing, preprocessing inputs, postprocessing outputs or adding functionalities.

  - **Usage**: Register hooks to methods to execute additional logic before or after the main method execution.
- **Registration Methods Signature**:
  - `register_pre_hook(pre_hook_method)`: A function that is invoked before the main method is executed. This function should do preprocessing of the arguments.
  - `register_post_hook(post_hook_method)`: A function that is invoked after the main method is executed. This function should do postprocessing of the outputs.
- **Method Signatures for Pre-Hooks**
  - `pre_hook_method(*args, **kwargs)`
  - **Arguments**:
    - `*args`, `**kwargs`: The arguments and keyword arguments that will be passed to the method being hooked. The pre-hook function has the opportunity to inspect and modify these arguments before they are passed to the main method.
  - **Return**:
    - Must return a tuple `(args, kwargs)`, which will be used as the new arguments for the main method. If the original arguments are not modified, the function should return them as received.
- **Method Signatures for Post-Hooks**:
  - `post_hook_method(*args, **kwargs)`
  - **Arguments**:
    - `*args`, `**kwargs`: The arguments and keyword arguments that were passed to the main method.
      - `kwargs["result"]`: The value returned by the main method. This allows the post-hook to inspect and even alter the result before it is returned to the original caller.
  - **Return**:
    - Can return a modified result, which will replace the original result of the main method, or simply return `kwargs["result"]` to return the original method result.    
  - ```python
    def pre_processing_hook(*args, **kwargs):
        print("Pre-processing logic here")
        # Modify arguments or perform any checks
        return args, kwargs  # Return modified or unmodified args and kwargs

    def post_processing_hook(*args, **kwargs):
        print("Post-processing logic here")
        # Modify the result or perform any final logging or cleanup
        return kwargs["result"]  # Return the modified or unmodified result

    class Preload:
        def __init__(self, connapp):
            # Registering a pre-hook
            connapp.ai.some_method.register_pre_hook(pre_processing_hook)

            # Registering a post-hook
            connapp.node.another_method.register_post_hook(post_processing_hook)
    ```

### Executable Block
- The plugin script can include an executable block:
  - `if __name__ == "__main__":`
  - This block allows the plugin to be run as a standalone script for testing or independent use.

### Script Verification
- The `verify_script` method in `plugins.py` is used to check the plugin script's compliance with these standards.
- Non-compliant scripts will be rejected to ensure consistency and proper functionality within the plugin system.
- 
### Example Script

For a practical example of how to write a compatible plugin script, please refer to the following example:

[Example Plugin Script](https://github.com/fluzzi/awspy)

This script demonstrates the required structure and implementation details according to the plugin system's standards.

## http API
With the Connpy API you can run commands on devices using http requests

### 1. List Nodes

**Endpoint**: `/list_nodes`

**Method**: `POST`

**Description**: This route returns a list of nodes. It can also filter the list based on a given keyword.

#### Request Body:

```json
{
  "filter": "<keyword>"
}
```

* `filter` (optional): A keyword to filter the list of nodes. It returns only the nodes that contain the keyword. If not provided, the route will return the entire list of nodes.

#### Response:

- A JSON array containing the filtered list of nodes.

---

### 2. Get Nodes

**Endpoint**: `/get_nodes`

**Method**: `POST`

**Description**: This route returns a dictionary of nodes with all their attributes. It can also filter the nodes based on a given keyword.

#### Request Body:

```json
{
  "filter": "<keyword>"
}
```

* `filter` (optional): A keyword to filter the nodes. It returns only the nodes that contain the keyword. If not provided, the route will return the entire list of nodes.

#### Response:

- A JSON array containing the filtered nodes.

---

### 3. Run Commands

**Endpoint**: `/run_commands`

**Method**: `POST`

**Description**: This route runs commands on selected nodes based on the provided action, nodes, and commands. It also supports executing tests by providing expected results.

#### Request Body:

```json
{
  "action": "<action>",
  "nodes": "<nodes>",
  "commands": "<commands>",
  "expected": "<expected>",
  "options": "<options>"
}
```

* `action` (required): The action to be performed. Possible values: `run` or `test`.
* `nodes` (required): A list of nodes or a single node on which the commands will be executed. The nodes can be specified as individual node names or a node group with the `@` prefix. Node groups can also be specified as arrays with a list of nodes inside the group.
* `commands` (required): A list of commands to be executed on the specified nodes.
* `expected` (optional, only used when the action is `test`): A single expected result for the test.
* `options` (optional): Array to pass options to the run command, options are: `prompt`, `parallel`, `timeout`  

#### Response:

- A JSON object with the results of the executed commands on the nodes.

---

### 4. Ask AI

**Endpoint**: `/ask_ai`

**Method**: `POST`

**Description**: This route sends to chatgpt IA a request that will parse it into an understandable output for the application and then run the request.

#### Request Body:

```json
{
  "input": "<user input request>",
  "dryrun": true or false
}
```

* `input` (required): The user input requesting the AI to perform an action on some devices or get the devices list.
* `dryrun` (optional): If set to true, it will return the parameters to run the request but it won't run it. default is false.

#### Response:

- A JSON array containing the action to run and the parameters and the result of the action.

## Automation module
The automation module
### Standalone module
```
import connpy
router = connpy.node("uniqueName","ip/host", user="user", password="pass")
router.run(["term len 0","show run"])
print(router.output)
hasip = router.test("show ip int brief","1.1.1.1")
if hasip:
    print("Router has ip 1.1.1.1")
else:
    print("router does not have ip 1.1.1.1")
```

### Using manager configuration
```
import connpy
conf = connpy.configfile()
device = conf.getitem("server@office")
server = connpy.node("unique name", **device, config=conf)
result = server.run(["cd /", "ls -la"])
print(result)
```
### Running parallel tasks 
```
import connpy
conf = connpy.configfile()
#You can get the nodes from the config from a folder and fitlering in it
nodes = conf.getitem("@office", ["router1", "router2", "router3"])
#You can also get each node individually:
nodes = {}
nodes["router1"] = conf.getitem("router1@office")
nodes["router2"] = conf.getitem("router2@office")
nodes["router10"] = conf.getitem("router10@datacenter")
#Also, you can create the nodes manually:
nodes = {}
nodes["router1"] = {"host": "1.1.1.1", "user": "user", "password": "pass1"}
nodes["router2"] = {"host": "1.1.1.2", "user": "user", "password": "pass2"}
nodes["router3"] = {"host": "1.1.1.2", "user": "user", "password": "pass3"}
#Finally you run some tasks on the nodes
mynodes = connpy.nodes(nodes, config = conf)
result = mynodes.test(["show ip int br"], "1.1.1.2")
for i in result:
    print("---" + i + "---")
    print(result[i])
    print()
# Or for one specific node
mynodes.router1.run(["term len 0". "show run"], folder = "/home/user/logs")
```
### Using variables
```
import connpy
config = connpy.configfile()
nodes = config.getitem("@office", ["router1", "router2", "router3"])
commands = []
commands.append("config t")
commands.append("interface lo {id}")
commands.append("ip add {ip} {mask}")
commands.append("end")
variables = {}
variables["router1@office"] = {"ip": "10.57.57.1"}
variables["router2@office"] = {"ip": "10.57.57.2"}
variables["router3@office"] = {"ip": "10.57.57.3"}
variables["__global__"] = {"id": "57"}
variables["__global__"]["mask"] =  "255.255.255.255"
expected = "!"
routers = connpy.nodes(nodes, config = config)
routers.run(commands, variables)
routers.test("ping {ip}", expected, variables)
for key in routers.result:
    print(key, ' ---> ', ("pass" if routers.result[key] else "fail"))
```
### Using AI
```
import connpy
conf = connpy.configfile()
organization = 'openai-org'
api_key = "openai-key"
myia = ai(conf, organization, api_key)
input = "go to router 1 and get me the full configuration"
result = myia.ask(input, dryrun = False)
print(result)
```
'''
from .core import node,nodes
from .configfile import configfile
from .connapp import connapp
from .api import *
from .ai import ai
from .plugins import Plugins
from ._version import __version__
from pkg_resources import get_distribution

__all__ = ["node", "nodes", "configfile", "connapp", "ai", "Plugins"]
__author__ = "Federico Luzzi"
__pdoc__ = {
    'core': False,
    'completion': False,
    'api': False,
    'plugins': False
}
