"""The Pods cog helps with managing Kubernetes pods."""

import zoneinfo
from datetime import datetime

import discord
import humanize
from discord.ext import commands
from kubernetes_asyncio.client.rest import ApiException
from loguru import logger
from tabulate import tabulate

from arthur.apis.kubernetes import pods
from arthur.bot import KingArthur
from arthur.config import CONFIG
from arthur.pagination import LinePaginator
from arthur.utils import generate_error_message

MAX_MESSAGE_LENGTH = 2000


def tabulate_pod_data(data: list[list[str]]) -> str:
    """Tabulate the pod data to be sent to Discord."""
    table = tabulate(
        data,
        headers=["Status", "Pod", "Phase", "IP", "Node", "Age", "Restarts"],
        tablefmt="psql",
        colalign=("center", "left", "left", "center", "center", "left", "center"),
    )

    return f"```\n{table}```"


class Pods(commands.Cog):
    """Commands for working with Kubernetes Pods."""

    def __init__(self, bot: KingArthur) -> None:
        self.bot = bot

    @commands.group(name="pods", aliases=["pod"], invoke_without_command=True)
    async def pods_cmd(self, ctx: commands.Context) -> None:
        """Commands for working with Kubernetes Pods."""
        await ctx.send_help(ctx.command)

    @pods_cmd.command(name="list", aliases=["ls"])
    async def pods_list(self, ctx: commands.Context, namespace: str = "default") -> None:
        """List pods in the selected namespace (defaults to default)."""
        pod_list = await pods.list_pods(namespace)

        if len(pod_list.items) == 0:
            await ctx.send(
                generate_error_message(description="No pods found, check the namespace exists.")
            )
            return

        tables = [[]]

        for pod in pod_list.items:
            match pod.status.phase:
                case "Running":
                    emote = "\N{LARGE GREEN CIRCLE}"
                case "Pending":
                    emote = "\N{LARGE YELLOW CIRCLE}"
                case "Succeeded":
                    emote = "\N{WHITE HEAVY CHECK MARK}"
                case "Failed":
                    emote = "\N{CROSS MARK}"
                case "Unknown":
                    emote = "\N{WHITE QUESTION MARK ORNAMENT}"
                case _:
                    emote = "\N{BLACK QUESTION MARK ORNAMENT}"

            time_human = humanize.naturaldelta(
                datetime.now(tz=zoneinfo.ZoneInfo("UTC")) - pod.metadata.creation_timestamp
            )

            # we know that Linode formats names like "lke<cluster>-<pool>-<node>"
            node_name = pod.spec.node_name.split("-")[2]

            table_data = [
                emote,
                pod.metadata.name,
                pod.status.phase,
                pod.status.pod_ip,
                node_name,
                time_human,
                pod.status.container_statuses[0].restart_count,
            ]

            if len(tabulate_pod_data(tables[-1] + [table_data])) > MAX_MESSAGE_LENGTH:
                tables.append([])
                tables[-1].append(table_data)
            else:
                tables[-1].append(table_data)

        await ctx.send(f"**Pods in namespace `{namespace}`**")

        for table in tables:
            await ctx.send(tabulate_pod_data(table))

        return

    @pods_cmd.command(name="logs", aliases=["log", "tail"])
    @commands.check(lambda ctx: ctx.channel.id == CONFIG.devops_channel_id)
    async def pods_logs(
        self, ctx: commands.Context, pod_name: str, namespace: str = "default", lines: int = 15
    ) -> None:
        """
        Tail the logs of a pod in the selected namespace (defaults to default).

        We also support the syntax of `deploy/<deployment-name>` to get the logs of the first pod associated with the deployment.
        """
        if pod_name.startswith("deploy/"):
            pod_names = await pods.get_pod_names_from_deployment(
                namespace, pod_name.removeprefix("deploy/")
            )
            logger.debug(f"Resolved deployment pod name to {pod_names}")
        else:
            pod_names = [pod_name]

        if pod_names is None:
            await ctx.send(
                generate_error_message(description="No pods found for the provided deployment.")
            )
            return

        for pod in pod_names:
            try:
                logs = await pods.tail_pod(namespace, pod, lines=lines)
            except ApiException as e:
                if e.status == 404:  # noqa: PLR2004, 404 is a known error
                    await ctx.send(
                        generate_error_message(
                            description="Pod or namespace not found, check the name."
                        )
                    )
                    return
                await ctx.send(generate_error_message(description=str(e)))
                return

            if len(logs) == 0:
                await ctx.send(generate_error_message(description="No logs found for the pod."))
                return

            logs = logs.splitlines()

            logs_embed = discord.Embed(
                title=f"**Logs for pod `{pod}` in namespace `{namespace}`**",
                colour=discord.Colour.blue(),
            )
            await LinePaginator.paginate(
                lines=logs,
                ctx=ctx,
                max_size=MAX_MESSAGE_LENGTH,
                empty=False,
                embed=logs_embed,
                prefix="```\n",
                suffix="```",
            )

        return


async def setup(bot: KingArthur) -> None:
    """Add the extension to the bot."""
    await bot.add_cog(Pods(bot))