# ui/globe_commands.py
from __future__ import annotations

from typing import Any

from ui.country_coords import resolve_countries


def empty_globe_state() -> dict[str, Any]:
    return {
        "version": 0,
        "details_version": 0,
        "markers": [],
        "highlights": [],
        "fly_to": None,
        "country_details": {},
    }


def _next_version(state: dict[str, Any]) -> int:
    return int(state.get("version", 0)) + 1


def _marker_payload(
    country: dict[str, Any],
    *,
    country_details: dict[str, Any] | None = None,
) -> dict[str, Any]:
    payload = {
        "iso2": country["iso2"],
        "name": country.get("name"),
        "label": country["label"],
        "lng": country["lng"],
        "lat": country["lat"],
    }
    if country_details:
        detail = country_details.get(country["iso2"])
        if detail:
            payload["detail"] = detail
    return payload


def _highlight_payload(country: dict[str, Any]) -> dict[str, Any]:
    return {
        "iso2": country["iso2"],
        "lng": country["lng"],
        "lat": country["lat"],
    }


def _fly_to_payload(
    countries: list[dict[str, Any]],
    *,
    zoom: float | None,
) -> dict[str, Any] | None:
    if not countries:
        return None
    if len(countries) == 1:
        country = countries[0]
        return {
            "center": [country["lng"], country["lat"]],
            "zoom": zoom if zoom is not None else 4.0,
        }

    lngs = [country["lng"] for country in countries]
    lats = [country["lat"] for country in countries]
    return {
        "bounds": [[min(lngs), min(lats)], [max(lngs), max(lats)]],
        "padding": 80,
    }


def apply_update_globe(
    state: dict[str, Any],
    args: dict[str, Any],
) -> tuple[dict[str, Any], dict[str, Any]]:
    action = (args.get("action") or "show").strip().lower()
    countries = args.get("countries") or []
    labels = args.get("labels")
    zoom = args.get("zoom")

    if action == "clear":
        new_state = empty_globe_state()
        new_state["version"] = _next_version(state)
        return {"status": "cleared", "action": action}, new_state

    if not countries:
        return (
            {"error": "countries is required unless action is clear"},
            state,
        )

    resolved, unknown = resolve_countries(countries, labels)
    if not resolved:
        return (
            {
                "error": "No valid ISO-2 country codes were provided",
                "unknown_codes": unknown,
            },
            state,
        )

    country_details = dict(state.get("country_details") or {})
    new_state = {
        "version": _next_version(state),
        "details_version": int(state.get("details_version", 0)),
        "markers": list(state.get("markers", [])),
        "highlights": list(state.get("highlights", [])),
        "fly_to": state.get("fly_to"),
        "country_details": country_details,
    }

    if action == "show":
        new_state["markers"] = [
            _marker_payload(country, country_details=country_details)
            for country in resolved
        ]
        new_state["highlights"] = [_highlight_payload(country) for country in resolved]
        new_state["fly_to"] = _fly_to_payload(resolved, zoom=zoom)
    elif action in {"markers", "add_markers"}:
        existing = {marker["iso2"] for marker in new_state["markers"]}
        for country in resolved:
            if country["iso2"] not in existing:
                new_state["markers"].append(
                    _marker_payload(country, country_details=country_details)
                )
    elif action == "highlight":
        existing = {item["iso2"] for item in new_state["highlights"]}
        for country in resolved:
            if country["iso2"] not in existing:
                new_state["highlights"].append(_highlight_payload(country))
    elif action == "fly_to":
        new_state["fly_to"] = _fly_to_payload(resolved, zoom=zoom)
    else:
        return (
            {
                "error": (
                    "Unknown action. Use show, markers, highlight, fly_to, or clear."
                )
            },
            state,
        )

    result: dict[str, Any] = {
        "status": "ok",
        "action": action,
        "countries": [
            {
                "iso2": country["iso2"],
                "name": country["name"],
                "label": country["label"],
            }
            for country in resolved
        ],
    }
    if unknown:
        result["unknown_codes"] = unknown
    return result, new_state