import asyncio, json, datetime, discord
from discord.ui import View, Select

class TaskSelect(Select):
    def __init__(self, options):
        super().__init__(placeholder="Choose a task to complete...",
        min_values=1, max_values=1, options=options)

    async def callback(self, interaction: discord.Interaction):
        payload = json.loads(self.values[0])
        tasklist_id = payload["tasklist_id"]
        task_id = payload["task_id"]

        await interaction.response.defer(thinking=True)
        try:
            service = build_tasks_service()
            task = await asyncio.to_thread(lambda:
            service.tasks().get(tasklist=tasklist_id, task=task_id).execute())
            if not task:
                await interaction.followup.send("Task not found.", ephemeral=True)
                return

                now = datetime.datetime.utcnow().replace(tzinfo=datetime.timezone.utc).isoformat()
                body = dict(task)
                body["status"] = "completed"
                body["completed"] = now

                updated = await asyncio.to_thread(lambda: service.tasks().update(tasklist=tasklist_id, task=task_id, body=body).execute())

                if updated.get("status") == "completed":
                    await interaction.followup.send("Failed to mark completed.", ephemeral=True)

        except Exception as e:
            await interaction.followup.send(f"Error: {e}", ephemeral=True)

class TasksView(View):
    def __init__(self, options, timeout=120):
        super().__init__(timeout=timeout)
        self.add_item(TaskSelect(options))