"""Notification manager — decides when to show action cards to the user.

Only pushes a new notification when the proposed action meaningfully changes.
In production (Swift), this becomes a native macOS notification / floating card.
Here it's a terminal prompt for testing.

Swift portability notes:
  - NotificationManager becomes a class with @Published properties
  - show_card() triggers a SwiftUI overlay or UNUserNotificationCenter
  - user_response() is wired to button taps instead of stdin
"""

from __future__ import annotations

import asyncio
import logging
from dataclasses import dataclass, field

log = logging.getLogger(__name__)


@dataclass
class ActionCard:
    """A proposed action shown to the user."""
    friction_type: str
    description: str
    actions: list[dict]
    source: str
    target: str
    vlm_payload: dict  # full VLM result for the executor


class NotificationManager:
    """Deduplicates notifications and manages the pending action card.

    Only shows a new card when the friction type or proposed action labels
    change from the previous notification.
    """

    def __init__(self):
        self._last_fingerprint: str = ""
        self._pending_card: ActionCard | None = None
        self._response_event: asyncio.Event = asyncio.Event()
        self._user_accepted: bool = False

    def _fingerprint(self, vlm_payload: dict) -> str:
        """Generate a dedup key from friction type + action labels."""
        friction = vlm_payload.get("friction", {})
        ftype = friction.get("type", "none")
        labels = tuple(
            a.get("label", "") for a in friction.get("proposed_actions", [])
        )
        return f"{ftype}:{labels}"

    # Action types that the executor can actually perform
    ACTIONABLE_TYPES = {"auto_extract", "brain_dump", "auto_fill", "summarize"}

    def should_notify(self, vlm_payload: dict) -> bool:
        """Check if this VLM result warrants a friction card (executor action).

        Only fires when proposed_actions contain something the executor can
        act on. Generic suggestions (action_type: "other") are nudges, not
        executor actions.
        """
        friction = vlm_payload.get("friction", {})

        # No friction or no proposed actions → no notification
        if friction.get("type") == "none":
            return False
        actions = friction.get("proposed_actions", [])
        if not actions:
            return False

        # Only notify if at least one action is executor-actionable
        has_actionable = any(
            a.get("action_type") in self.ACTIONABLE_TYPES for a in actions
        )
        if not has_actionable:
            return False

        # Same as last notification → skip
        fp = self._fingerprint(vlm_payload)
        if fp == self._last_fingerprint:
            return False

        return True

    def create_card(self, vlm_payload: dict) -> ActionCard:
        """Create an action card from VLM output and mark it as pending."""
        friction = vlm_payload.get("friction", {})
        card = ActionCard(
            friction_type=friction.get("type", ""),
            description=friction.get("description", ""),
            actions=friction.get("proposed_actions", []),
            source=friction.get("source_context", ""),
            target=friction.get("target_context", ""),
            vlm_payload=vlm_payload,
        )
        self._pending_card = card
        self._last_fingerprint = self._fingerprint(vlm_payload)
        self._response_event.clear()
        self._user_accepted = False
        return card

    def show_card_terminal(self, card: ActionCard) -> None:
        """Print the action card to terminal. (Swift: show native UI.)"""
        print()
        print("┌" + "─" * 58 + "┐")
        print(f"│ {'🔧 Friction detected':^58} │")
        print("│" + " " * 58 + "│")
        desc_lines = _wrap(card.description, 56)
        for line in desc_lines:
            print(f"│ {line:<56} │")
        print("│" + " " * 58 + "│")
        for i, action in enumerate(card.actions):
            label = action.get("label", "?")
            print(f"│  [{i + 1}] {label:<53} │")
        print(f"│  [0] Not now{' ' * 44} │")
        print("└" + "─" * 58 + "┘")
        print()

    async def wait_for_response(self, timeout: float = 30.0) -> tuple[bool, int]:
        """Wait for user response. Returns (accepted, action_index).

        Swift portability: this becomes a button tap callback.
        """
        try:
            await asyncio.wait_for(self._response_event.wait(), timeout=timeout)
            return self._user_accepted, self._selected_index
        except asyncio.TimeoutError:
            log.debug("Notification timed out, dismissing")
            self._pending_card = None
            return False, -1

    def submit_response(self, choice: int) -> None:
        """Submit user's choice. Called from input reader task.

        Swift portability: called from button tap handler.
        """
        if choice > 0 and self._pending_card:
            self._user_accepted = True
            self._selected_index = choice - 1
        else:
            self._user_accepted = False
            self._selected_index = -1
        self._response_event.set()

    @property
    def pending(self) -> ActionCard | None:
        return self._pending_card

    def dismiss(self) -> None:
        """Dismiss current card without action."""
        self._pending_card = None
        self._last_fingerprint = ""


def _wrap(text: str, width: int) -> list[str]:
    """Simple word wrap."""
    words = text.split()
    lines: list[str] = []
    current = ""
    for word in words:
        if len(current) + len(word) + 1 <= width:
            current = f"{current} {word}" if current else word
        else:
            if current:
                lines.append(current)
            current = word
    if current:
        lines.append(current)
    return lines or [""]