"""
Write-through interception layer for live device mode.

Checks app_state.live_mode and routes mutations through DeviceSession/SoxClient.
In offline mode, falls through to the original DOM-only code paths.
"""

import app_state
from sox import type_id_for_slot


def is_live():
    return (app_state.live_mode
            and app_state.device_session is not None
            and app_state.device_session.is_connected)


# ── Property Write ──────────────────────────────────────────────

def live_set_prop_value(element, slot_name, value_str):
    """In live mode, sends a Sox write to the device. Returns True on success."""
    if not is_live():
        return False

    ds = app_state.device_session
    comp_id = _comp_id(element)
    if comp_id is None:
        return False

    slot_info = _find_slot(ds, comp_id, slot_name)
    if slot_info is None:
        return False

    type_id = type_id_for_slot(slot_info["type_name"])
    coerced = _coerce_value(type_id, value_str)

    try:
        ds.sox_client.write_prop(comp_id, slot_info["id"], type_id, coerced)
        return True
    except Exception as e:
        app_state.set_status(f"Write failed: {e}", warn=True)
        return False


# ── Add Component ───────────────────────────────────────────────

def live_add_component(parent_element, kit_name, type_name, comp_name, config_values=None):
    """In live mode, sends a Sox add to the device. Returns new comp_id or None."""
    if not is_live():
        return None

    ds = app_state.device_session
    parent_id = _comp_id(parent_element)
    if parent_id is None:
        return None

    kit_id = _kit_id(ds, kit_name)
    type_id_val = _type_id(ds, kit_id, type_name)
    if kit_id is None or type_id_val is None:
        return None

    sox_config = []
    if config_values:
        for tid, val in config_values:
            sox_config.append((tid, val))

    try:
        new_comp = ds.sox_client.add(parent_id, kit_id, type_id_val, comp_name, sox_config)
        ds.after_add(new_comp.id)
        return new_comp.id
    except Exception as e:
        app_state.set_status(f"Add failed: {e}", warn=True)
        return None


# ── Delete Component ────────────────────────────────────────────

def live_delete_component(element):
    """In live mode, sends a Sox delete to the device. Returns True on success."""
    if not is_live():
        return False

    ds = app_state.device_session
    comp_id = _comp_id(element)
    if comp_id is None:
        return False

    descendant_ids = []
    for desc in element.iter():
        if desc.tag == "comp" and desc is not element:
            did = _comp_id(desc)
            if did is not None:
                descendant_ids.append(did)

    try:
        ds.sox_client.delete(comp_id)
        ds.after_delete(comp_id, descendant_ids)
        return True
    except Exception as e:
        app_state.set_status(f"Delete failed: {e}", warn=True)
        return False


# ── Rename Component ────────────────────────────────────────────

def live_rename_component(element, new_name):
    """In live mode, sends a Sox rename to the device. Returns True on success."""
    if not is_live():
        return False

    ds = app_state.device_session
    comp_id = _comp_id(element)
    if comp_id is None:
        return False

    try:
        ds.sox_client.rename(comp_id, new_name)
        return True
    except Exception as e:
        app_state.set_status(f"Rename failed: {e}", warn=True)
        return False


# ── Link / Unlink ───────────────────────────────────────────────

def live_add_link(from_element, from_slot_name, to_element, to_slot_name):
    """In live mode, sends a Sox link command. Returns True on success."""
    if not is_live():
        return False

    ds = app_state.device_session
    from_id = _comp_id(from_element)
    to_id = _comp_id(to_element)
    if from_id is None or to_id is None:
        return False

    from_slot = _find_slot(ds, from_id, from_slot_name)
    to_slot = _find_slot(ds, to_id, to_slot_name)
    if from_slot is None or to_slot is None:
        return False

    try:
        ds.sox_client.link(from_id, from_slot["id"], to_id, to_slot["id"])
        return True
    except Exception as e:
        app_state.set_status(f"Link failed: {e}", warn=True)
        return False


def live_delete_link(from_element, from_slot_name, to_element, to_slot_name):
    """In live mode, sends a Sox unlink command. Returns True on success."""
    if not is_live():
        return False

    ds = app_state.device_session
    from_id = _comp_id(from_element)
    to_id = _comp_id(to_element)
    if from_id is None or to_id is None:
        return False

    from_slot = _find_slot(ds, from_id, from_slot_name)
    to_slot = _find_slot(ds, to_id, to_slot_name)
    if from_slot is None or to_slot is None:
        return False

    try:
        ds.sox_client.unlink(from_id, from_slot["id"], to_id, to_slot["id"])
        return True
    except Exception as e:
        app_state.set_status(f"Unlink failed: {e}", warn=True)
        return False


# ── Invoke Action ───────────────────────────────────────────────

def live_invoke(element, slot_name, arg=None):
    """In live mode, sends a Sox invoke. Returns True on success."""
    if not is_live():
        return False

    ds = app_state.device_session
    comp_id = _comp_id(element)
    if comp_id is None:
        return False

    slot_info = _find_slot(ds, comp_id, slot_name)
    if slot_info is None:
        return False

    try:
        ds.sox_client.invoke(comp_id, slot_info["id"])
        return True
    except Exception as e:
        app_state.set_status(f"Invoke failed: {e}", warn=True)
        return False


# ── Helpers ─────────────────────────────────────────────────────

def _comp_id(element):
    if element.tag == "app":
        return 0
    cid = element.get("id")
    if cid is None:
        return None
    try:
        return int(cid)
    except ValueError:
        return None


def _find_slot(ds, comp_id, slot_name):
    comp = ds.sox_client.cache_get(comp_id)
    if comp is None:
        return None
    slots = ds.sox_client.slot_registry.get((comp.kit_id, comp.type_id))
    if slots is None:
        return None
    for s in slots:
        if s["name"] == slot_name:
            return s
    return None


def _kit_id(ds, kit_name):
    if ds.sox_client.schema_parts:
        for i, part in enumerate(ds.sox_client.schema_parts):
            if part.name == kit_name:
                return i
    return None


def _type_id(ds, kit_id, type_name):
    if kit_id is None:
        return None
    for (kid, tid), full_name in ds.sox_client.type_name_map.items():
        if kid == kit_id and full_name.endswith(f"::{type_name}"):
            return tid
    return None


def _coerce_value(type_id, value_str):
    from sox import BOOL_ID, BYTE_ID, SHORT_ID, INT_ID, LONG_ID, FLOAT_ID, DOUBLE_ID, STR_ID
    if type_id == BOOL_ID:
        return value_str.lower() in ("true", "1", "yes")
    elif type_id in (BYTE_ID, SHORT_ID, INT_ID):
        return int(value_str)
    elif type_id == LONG_ID:
        return int(value_str)
    elif type_id == FLOAT_ID:
        return float(value_str)
    elif type_id == DOUBLE_ID:
        return float(value_str)
    elif type_id == STR_ID:
        return str(value_str)
    return value_str