"""Shared configuration, runtime state and widget handles.

Every other module reaches this state as ``app_state.<name>`` rather than importing
the names directly. A plain ``from app_state import is_dirty`` would copy the value,
so later rebinding would only ever be seen by the module that did it.
"""

import configparser
import os

VERSION = "0.0.0.028"
PROPERTIES_FILE = "editor.properties"
DEFAULT_GRID_SIZE = 10
DEFAULT_ADD_TIMESTAMP = True

# Purely a display choice, so it lives in editor.properties. The SAX file has nowhere to
# record it: meta stores a position and nothing about box size.
DEFAULT_BOX_WIDTH = 100
MIN_ALLOWED_BOX_WIDTH = 60
MAX_ALLOWED_BOX_WIDTH = 400

# Widget handles, filled in by main once the UI exists
window = None
canvas = None
tree = None

# Maps to hold tracking states
tree_element_map = {}       # Treeview item ID -> ET.Element
canvas_comp_map = {}        # Canvas item tag -> ET.Element
canvas_tag_by_element = {}  # ET.Element -> Canvas unique tag string
component_slot_offsets = {} # Canvas unique tag -> {slot name: y offset from box top}

# File modification tracking state
is_dirty = False
current_file_path = None
active_components_list = []   # Tracks what components are actively painted
selected_canvas_tag = None    # Tracks the currently clicked/highlighted canvas component tag
selected_tree_item_id = None  # Tracks the currently right-clicked Treeview item
xml_root_element = None       # Keep a persistent root reference to redraw tree layouts cleanly
current_sheet_parent = None   # Element whose children are painted; None means the app root

# Drag-and-drop state variables
drag_data = {"x": 0, "y": 0, "tag": None}

# Global component slot registries compiled dynamically per file load
final_components_registry = {}
active_schema_kits = {}


def load_preferences():
    """Loads application configurations from editor.properties or initializes defaults."""
    config = configparser.ConfigParser()
    grid_size = DEFAULT_GRID_SIZE
    add_timestamp = DEFAULT_ADD_TIMESTAMP
    box_width = DEFAULT_BOX_WIDTH
    sedona_home = ""

    if os.path.exists(PROPERTIES_FILE):
        try:
            config.read(PROPERTIES_FILE)
            grid_size = config.getint("Editor", "grid_size", fallback=DEFAULT_GRID_SIZE)
            add_timestamp = config.getboolean("Editor", "add_timestamp", fallback=DEFAULT_ADD_TIMESTAMP)
            box_width = config.getint("Editor", "box_width", fallback=DEFAULT_BOX_WIDTH)
            sedona_home = config.get("Editor", "sedona.home", fallback="").strip()
        except Exception:
            pass
    else:
        config["Editor"] = {
            "sedona.home": "",
            "grid_size": str(DEFAULT_GRID_SIZE),
            "add_timestamp": str(DEFAULT_ADD_TIMESTAMP),
            "box_width": str(DEFAULT_BOX_WIDTH)
        }
        try:
            with open(PROPERTIES_FILE, "w") as configfile:
                config.write(configfile)
        except Exception:
            pass

    box_width = max(MIN_ALLOWED_BOX_WIDTH, min(MAX_ALLOWED_BOX_WIDTH, box_width))
    return sedona_home, grid_size, add_timestamp, box_width


def save_preferences():
    """Writes the current preference values back to editor.properties."""
    config = configparser.ConfigParser()
    config["Editor"] = {
        "sedona.home": SEDONA_HOME,
        "grid_size": str(GRID_SIZE),
        "add_timestamp": str(ADD_TIMESTAMP),
        "box_width": str(BOX_WIDTH)
    }
    with open(PROPERTIES_FILE, "w") as configfile:
        config.write(configfile)


def mark_dirty():
    """Single funnel for 'the document changed', including the unsaved-state tint."""
    global is_dirty
    if not is_dirty:
        is_dirty = True
        if canvas is not None:
            canvas.config(bg="#ffe6e6")


def mark_clean():
    """Clears the unsaved-state marker after a successful save or a fresh load."""
    global is_dirty
    is_dirty = False
    if canvas is not None:
        canvas.config(bg="white")


SEDONA_HOME, GRID_SIZE, ADD_TIMESTAMP, BOX_WIDTH = load_preferences()