#!/usr/bin/env python3

from __future__ import annotations

import os
import sys

from typing import List, Tuple, Any

from redis import Redis
from redis.exceptions import ConnectionError
from rich.console import Console
from rich.padding import Padding

from lookyloo.default import get_socket_path, AbstractManager

# NOTE: run with watch:
#   watch --color tools/monitoring.py

console = Console(color_system="256")


class Monitoring():

    def __init__(self) -> None:
        self.redis_cache: Redis = Redis(unix_socket_path=get_socket_path('cache'), decode_responses=True)  # type: ignore[type-arg]
        self.redis_indexing: Redis = Redis(unix_socket_path=get_socket_path('indexing'), decode_responses=True)  # type: ignore[type-arg]

    @property
    def backend_status(self) -> bool:
        socket_path_cache = get_socket_path('cache')
        socket_path_index = get_socket_path('indexing')
        backend_up = True
        if not os.path.exists(socket_path_cache):
            console.print(f'Socket path for the [blue]cache[/blue] redis DB [red]does not exists[/red] ({socket_path_cache}).')
            backend_up = False
        if not os.path.exists(socket_path_index):
            console.print(f'Socket path for the [blue]indexing[/blue] redis DB [red]does not exists[/red] ({socket_path_index}).')
            backend_up = False
        if backend_up:
            try:
                cache_reachable = True if self.redis_cache.ping() else False
                if not cache_reachable:
                    console.print('Unable to ping the redis cache db.')
                    backend_up = False
            except ConnectionError:
                console.print('Unable to connect to the redis cache db.')
                backend_up = False
            try:
                indexing_reachable = True if self.redis_indexing.ping() else False
                if not indexing_reachable:
                    console.print('Unable to ping the redis indexing db.')
                    backend_up = False
            except ConnectionError:
                console.print('Unable to connect to the redis indexing db.')
                backend_up = False

        return backend_up

    @property
    def queues(self) -> list[tuple[str, float]]:
        return self.redis_cache.zrevrangebyscore('queues', 'Inf', '-Inf', withscores=True)

    @property
    def ongoing_captures(self) -> list[tuple[str, float, dict[str, Any]]]:
        captures_uuid: list[tuple[str, float]] = self.redis_cache.zrevrangebyscore('to_capture', 'Inf', '-Inf', withscores=True)
        if not captures_uuid:
            return []
        to_return = []
        for uuid, rank in captures_uuid:
            capture_params = self.redis_cache.hgetall(uuid)
            if 'document' in capture_params:
                capture_params.pop('document')
            if capture_params:
                to_return.append((uuid, rank, capture_params))

        return to_return

    @property
    def tree_cache(self) -> dict[str, str]:
        to_return = {}
        for pid_name, value in self.redis_cache.hgetall('tree_cache').items():
            pid, name = pid_name.split('|', 1)
            try:
                os.kill(int(pid), 0)
            except OSError:
                self.redis_cache.hdel('tree_cache', pid_name)
                continue
            to_return[pid_name] = value
        return to_return


if __name__ == '__main__':

    m = Monitoring()
    backend_up = m.backend_status
    if not backend_up:
        console.print('[bold red]Backend not up, breaking.[/bold red]')
        sys.exit()

    console.print('Services currently running:')
    running = AbstractManager.is_running()
    for service, number in running:
        s = Padding(f'{service} ({int(number)} service(s))', (0, 2))
        console.print(s)

    console.print('Current cache status:')
    for name, status in m.tree_cache.items():
        s = Padding(f'{name}: {status}', (0, 2))
        console.print(s)

    console.print('Current queues:')
    for q, priority in m.queues:
        s = Padding(f'{q} Recently enqueued captures: {int(priority)}', (0, 2))
        console.print(s)
    # ------------------
    console.print('Captures details:')
    captures = m.ongoing_captures
    console.print(f'Queue length: [yellow]{len(captures)}[/yellow]')
    for uuid, rank, d in captures:
        a = Padding(f'{uuid} Rank: {int(rank)}', (0, 2))
        console.print(a)
        console.print(d)