"""Production specs used by the checks.

Every UPPERCASE value can be overridden by a studio JSON file, see
``apply_overrides`` (path set in the add-on preferences or through the
``WTD_SANITY_CONFIG`` environment variable). Checks must read values at run
time (``config.FPS``), never copy them at import time, so overrides apply.

Values marked TODO are placeholders waiting for the real production specs.
"""

import copy
import json
import os
import sys

# --------------------------------------------------------------------------- #
# Scene / render
# --------------------------------------------------------------------------- #
FPS = 24
FPS_BASE = 1.0
RESOLUTION = (2048, 858)
RESOLUTION_PERCENTAGE = 100
PIXEL_ASPECT = (1.0, 1.0)

# Units. TODO: confirm with production (metric/meters assumed).
UNIT_SYSTEM = "METRIC"
UNIT_SCALE_LENGTH = 1.0
UNIT_LENGTH = "METERS"

# Color management. TODO: colorspace still to be determined by production.
# A value of None means "not checked".
COLOR_MANAGEMENT = {
    "display_device": "sRGB",
    "view_transform": "Standard",
    "look": "None",
    "exposure": 0.0,
    "gamma": 1.0,
    "sequencer_colorspace": "sRGB",
    "working_space": None,  # e.g. "Linear Rec.709" (Blender 5+). Check only, never auto-fixed.
}

# --------------------------------------------------------------------------- #
# File names. TODO: replace with the real Libreflow/Kitsu naming.
# Named group "asset" is used to guess the asset/character name.
# --------------------------------------------------------------------------- #
FILENAME_PATTERNS = {
    "GENERAL": r"^(?:prp|set|chr)_(?P<asset>[A-Za-z0-9]+)_(?:mod|lineart|shading)(?:_v\d{3})?\.blend$",
    "CHAR_MOD": r"^chr_(?P<asset>[A-Za-z0-9]+)_mod(?:_v\d{3})?\.blend$",
    "CHAR_LINEART": r"^chr_(?P<asset>[A-Za-z0-9]+)_(?:lineart|shading)(?:_v\d{3})?\.blend$",
    "LAYOUT": r"^(?P<sequence>sq\d{3})_(?P<shot>sh\d{4})_layout(?:_v\d{3})?\.blend$",
}

# --------------------------------------------------------------------------- #
# Naming
# --------------------------------------------------------------------------- #
# Body of a name after its prefix: snake_case or PascalCase tokens joined by "_".
NAME_BODY_PATTERN = r"[A-Za-z0-9]+(?:_[A-Za-z0-9]+)*"

# Object prefix per object type. Types not listed are not checked.
OBJECT_PREFIXES = {
    "MESH": "GEO_",
    "CURVE": "CRV_",
    "SURFACE": "SRF_",
    "FONT": "TXT_",
    "EMPTY": "NUL_",
    "ARMATURE": "RIG_",
    "LATTICE": "LAT_",
    "GREASEPENCIL": "LA_",
    "CAMERA": "CAM_",
    "LIGHT": "LGT_",
}

# Prefix per bpy.data collection.
DATABLOCK_PREFIXES = {
    "collections": "COL_",
    "materials": "MAT_",
    "node_groups": "NG_",
}

# Mesh datablocks must carry the same name as their (single) object.
MESH_DATA_MATCHES_OBJECT = True

# Blender default names that must never survive in a published file.
DEFAULT_NAMES = {
    "cube", "plane", "sphere", "uvsphere", "icosphere", "cylinder", "cone",
    "torus", "circle", "grid", "suzanne", "monkey", "empty", "camera",
    "light", "lamp", "point", "sun", "spot", "area", "material", "collection",
    "beziercurve", "beziercircle", "nurbscurve", "nurbspath", "text",
    "armature", "lattice", "nodegroup", "geometrynodes", "stroke", "gpencil",
    "lineart", "scene", "world", "object", "mesh",
}

# --------------------------------------------------------------------------- #
# Structure (placeholder, real hierarchy to be defined)
# --------------------------------------------------------------------------- #
# Collections that must exist. "{asset}" is replaced by the asset name.
REQUIRED_COLLECTIONS = []

# --------------------------------------------------------------------------- #
# Geometry
# --------------------------------------------------------------------------- #
MAX_FACE_SIDES = 4
# sin() of the reflex angle above which a corner counts as concave.
CONCAVE_TOLERANCE = 1e-4
# Open borders are reported as non-manifold unless this is True.
NON_MANIFOLD_ALLOW_BOUNDARY = False
UV_NEGATIVE_TOLERANCE = 1e-6

# --------------------------------------------------------------------------- #
# Objects
# --------------------------------------------------------------------------- #
ALLOWED_MODIFIERS = {"SUBSURF", "MULTIRES"}
ALLOWED_MODIFIERS_LINEART = {
    "SUBSURF", "MULTIRES", "LINEART", "GREASE_PENCIL_THICKNESS",
}

# Which transform channels must be applied.
APPLY_TRANSFORM = {"location": False, "rotation": True, "scale": True}
APPLY_TRANSFORM_TYPES = {"MESH", "CURVE", "SURFACE", "FONT", "META"}
TRANSFORM_TOLERANCE = 1e-5

# Object types that must not be present in asset files.
FORBIDDEN_ASSET_OBJECT_TYPES = {"LIGHT", "CAMERA"}

# --------------------------------------------------------------------------- #
# Characters
# --------------------------------------------------------------------------- #
# Reference JSON exported from the master character (see panel > Export
# Character Reference). Overridden by the add-on preferences or by the
# WTD_CHAR_REFERENCE environment variable.
CHAR_REFERENCE_PATH = ""

# Name of the character body object. "{asset}" is the character name.
CHAR_BODY_NAME = "GEO_{asset}_Body"

# Name keywords that identify inner mouth / eye parts (case-insensitive).
CHAR_PART_KEYWORDS = [
    "eye", "iris", "pupil", "cornea", "sclera", "lid", "lash",
    "mouth", "teeth", "tooth", "tongue", "gum", "palate",
]

# Vertex groups the body mesh must have. TODO: real list.
CHAR_BODY_VERTEX_GROUPS = []

# --------------------------------------------------------------------------- #
# Layout
# --------------------------------------------------------------------------- #
# Instanced collections matching this pattern are sets that must sit at the origin.
SET_COLLECTION_PATTERN = r"^(?:SET|ENV|set|env)[_-]"

# Version token in a file or folder name (Libreflow stores v001/ folders).
VERSION_PATTERN = r"(?<![A-Za-z0-9])v(\d{3,4})(?![0-9])"

# Datablock types scanned for ".001" duplicated names.
DUPLICATE_NAME_TYPES = ["objects", "collections", "cameras", "materials", "actions", "node_groups"]

# --------------------------------------------------------------------------- #
# UI
# --------------------------------------------------------------------------- #
CATEGORY_ORDER = [
    "Scene", "File", "Naming", "Structure", "Geometry", "UVs", "Objects",
    "Shading", "Animation", "Character", "Lineart", "Shot", "Sound",
]
MAX_ISSUES_DRAWN = 30


# --------------------------------------------------------------------------- #
# Overrides
# --------------------------------------------------------------------------- #
_DEFAULTS = None


def _snapshot():
    global _DEFAULTS
    if _DEFAULTS is None:
        module = sys.modules[__name__]
        _DEFAULTS = {
            k: copy.deepcopy(v) for k, v in vars(module).items() if k.isupper() and not k.startswith("_")
        }
    return _DEFAULTS


def apply_overrides(path=""):
    """Reset to defaults, then apply a JSON file of {"NAME": value} overrides.

    ``path`` falls back to the WTD_SANITY_CONFIG environment variable.
    Returns the list of keys that were overridden.
    """
    module = sys.modules[__name__]
    defaults = _snapshot()
    for key, value in defaults.items():
        setattr(module, key, copy.deepcopy(value))

    path = path or os.environ.get("WTD_SANITY_CONFIG", "")
    if not path:
        return []
    with open(path, encoding="utf-8") as fh:
        data = json.load(fh)

    applied = []
    for key, value in data.items():
        if key not in defaults:
            print(f"[WTD Sanity] Unknown config key ignored: {key}")
            continue
        default = defaults[key]
        if isinstance(default, (set, frozenset)):
            value = set(value)
        elif isinstance(default, tuple):
            value = tuple(value)
        elif isinstance(default, dict) and isinstance(value, dict):
            value = {**default, **value}
        setattr(module, key, value)
        applied.append(key)
    return applied