"""Generic template-input application for Blender template scenes.

Template inputs are exposed to the scene via custom properties and optional
visibility/selection markers. This keeps legacy templates untouched while
allowing graph workflows to pass structured overrides into `.blend` scenes.
"""

from __future__ import annotations

import json
import re
from typing import Any

import bpy  # type: ignore[import]


_MARKER_PROP_NAMES = (
    "hartomat_template_input",
    "hartomat.template_input",
    "template_input",
    "schaeffler_template_input",
)
_MARKER_KEY_PROP_NAMES = (
    "hartomat_template_input_key",
    "hartomat.template_input_key",
    "template_input_key",
    "schaeffler_template_input_key",
)
_MARKER_VALUE_PROP_NAMES = (
    "hartomat_template_input_value",
    "hartomat.template_input_value",
    "template_input_value",
    "schaeffler_template_input_value",
)
_NAME_PATTERNS = (
    re.compile(r"template_input__(?P<key>[^_]+)__(?P<value>[^_]+)", re.IGNORECASE),
    re.compile(r"template-input:(?P<key>[^=]+)=(?P<value>.+)", re.IGNORECASE),
    re.compile(r"ti::(?P<key>[^:]+)::(?P<value>.+)", re.IGNORECASE),
)


def _normalize_template_inputs(template_inputs: dict[str, Any] | None) -> dict[str, str]:
    normalized: dict[str, str] = {}
    for raw_key, raw_value in (template_inputs or {}).items():
        key = str(raw_key or "").strip()
        if not key or raw_value is None:
            continue
        if isinstance(raw_value, bool):
            value = "true" if raw_value else "false"
        else:
            value = str(raw_value).strip()
        if value:
            normalized[key] = value
    return normalized


def _scene_targets():
    yield ("collection", bpy.data.collections)
    yield ("object", bpy.data.objects)
    yield ("world", bpy.data.worlds)


def _extract_marker(target) -> tuple[str, str] | None:
    for prop_name in _MARKER_PROP_NAMES:
        raw = target.get(prop_name)
        if not raw:
            continue
        if isinstance(raw, str):
            text = raw.strip()
            if not text:
                continue
            if text.startswith("{"):
                try:
                    payload = json.loads(text)
                except Exception:
                    payload = None
                if isinstance(payload, dict):
                    key = str(payload.get("key", "")).strip()
                    value = str(payload.get("value", "")).strip()
                    if key and value:
                        return key, value
            if "=" in text:
                key, value = text.split("=", 1)
                key = key.strip()
                value = value.strip()
                if key and value:
                    return key, value

    key = None
    value = None
    for prop_name in _MARKER_KEY_PROP_NAMES:
        raw = target.get(prop_name)
        if raw:
            key = str(raw).strip()
            if key:
                break
    for prop_name in _MARKER_VALUE_PROP_NAMES:
        raw = target.get(prop_name)
        if raw is not None:
            value = str(raw).strip()
            if value:
                break
    if key and value:
        return key, value

    name = getattr(target, "name", "") or ""
    for pattern in _NAME_PATTERNS:
        match = pattern.search(name)
        if not match:
            continue
        key = match.group("key").strip()
        value = match.group("value").strip()
        if key and value:
            return key, value
    return None


def _find_layer_collection(layer_collection, collection_name: str):
    if layer_collection.collection.name == collection_name:
        return layer_collection
    for child in layer_collection.children:
        found = _find_layer_collection(child, collection_name)
        if found is not None:
            return found
    return None


def _apply_collection_visibility(collection, *, enabled: bool) -> None:
    collection.hide_render = not enabled
    collection.hide_viewport = not enabled
    for view_layer in bpy.context.scene.view_layers:
        layer_collection = _find_layer_collection(view_layer.layer_collection, collection.name)
        if layer_collection is not None:
            layer_collection.exclude = not enabled
            layer_collection.hide_viewport = not enabled


def _apply_object_visibility(obj, *, enabled: bool) -> None:
    obj.hide_render = not enabled
    obj.hide_viewport = not enabled
    try:
        obj.hide_set(not enabled)
    except Exception:
        pass


def _apply_world_selection(world, *, enabled: bool) -> None:
    if enabled:
        bpy.context.scene.world = world


def apply_template_inputs(template_inputs: dict[str, Any] | None) -> None:
    normalized = _normalize_template_inputs(template_inputs)
    if not normalized:
        return

    scene = bpy.context.scene
    for key, value in normalized.items():
        scene[f"template_input__{key}"] = value
        scene[f"hartomat_template_input__{key}"] = value

    matched_targets = 0
    for kind, targets in _scene_targets():
        for target in targets:
            marker = _extract_marker(target)
            if marker is None:
                continue
            key, expected_value = marker
            if key not in normalized:
                continue
            enabled = normalized[key] == expected_value
            matched_targets += 1
            if kind == "collection":
                _apply_collection_visibility(target, enabled=enabled)
            elif kind == "object":
                _apply_object_visibility(target, enabled=enabled)
            elif kind == "world":
                _apply_world_selection(target, enabled=enabled)

    print(
        f"[blender_render] applied template_inputs keys={sorted(normalized)} matched_targets={matched_targets}",
        flush=True,
    )