# v4.0.0 settings.py
import json
import sys
from dataclasses import dataclass
from pathlib import Path
from typing import Final


def resolve_app_dir() -> Path:
    if getattr(sys, "frozen", False):
        return Path(
            sys.executable
        ).resolve().parent

    return (
        Path(__file__)
        .resolve()
        .parent
        .parent
    )


APP_DIR: Final[Path] = (
    resolve_app_dir()
)

APP_DIR.mkdir(
    parents=True,
    exist_ok=True,
)

SETTINGS_FILE: Final[Path] = (
    APP_DIR / "settings.json"
)

STATE_FILE: Final[Path] = (
    APP_DIR / "active.json"
)

MARKDOWN_FILE: Final[Path] = (
    APP_DIR / "note.md"
)


DEFAULT_SETTINGS: Final[dict] = {
    "active_profile": "default",
    "profiles": {
        "default": {
            "theme": "dark",
            "window": {
                "width": 250,
                "height": 260,
                "min_width": 200,
                "min_height": 100,
                "layout_margin": 0,
                "layout_spacing": 0,
                "drag_handle_height": 0,
                "resize_grip_size": 16,
                "corner_radius": 8,
                "startup_stabilize_ms": 80,
            },
            "appearance": {
                "enable_mica": True,
                "enable_acrylic": True,
                "enable_glass_blur": True,
                "enable_animations": True,
                "enable_shadow": False,
                "opacity_active": 0.97,
                "opacity_inactive": 0.95,
                "opacity_dragging": 0.89,
                "focus_animation_ms": 180,
            },
            "editor": {
                "font_family": [
                    "Inter",
                    "SF Pro Display",
                    "Helvetica",
                    "Arial",
                    "system-ui",
                ],
                "font_size": 13,
                "preview_delay_ms": 700,
                "save_debounce_ms": 500,
                "max_note_size": 2_000_000,
                "enable_markdown_preview": True,
                "enable_clickable_links": True,
                "enable_antialiasing": True,
                "enable_spellcheck": False,
                "padding": 0,
            },
            "behavior": {
                "enable_tray": True,
                "enable_persistence": True,
                "enable_window_memory": True,
                "enable_auto_restore": True,
                "high_contrast_inactive": False,
            },
        },
    },
}


def atomic_write(
    path: Path,
    content: str,
) -> None:
    path.parent.mkdir(
        parents=True,
        exist_ok=True,
    )

    temp = path.with_suffix(
        f"{path.suffix}.tmp"
    )

    temp.write_text(
        content,
        encoding="utf-8",
    )

    temp.replace(path)


@dataclass(slots=True)
class SettingsManager:
    settings: dict

    @classmethod
    def load(cls) -> "SettingsManager":
        SETTINGS_FILE.parent.mkdir(
            parents=True,
            exist_ok=True,
        )

        if not SETTINGS_FILE.exists():
            atomic_write(
                SETTINGS_FILE,
                json.dumps(
                    DEFAULT_SETTINGS,
                    indent=2,
                ),
            )

        try:
            raw = SETTINGS_FILE.read_text(
                encoding="utf-8",
            )

            data = json.loads(raw)

            merged = cls.merge_defaults(
                DEFAULT_SETTINGS,
                data,
            )

            manager = cls(merged)

            manager.save()

            return manager

        except Exception:
            atomic_write(
                SETTINGS_FILE,
                json.dumps(
                    DEFAULT_SETTINGS,
                    indent=2,
                ),
            )

            return cls(
                DEFAULT_SETTINGS
            )

    @staticmethod
    def merge_defaults(
        defaults: dict,
        current: dict,
    ) -> dict:
        result = {}

        for key, value in defaults.items():
            result[key] = value

        for key, value in current.items():
            if (
                key in result
                and isinstance(
                    result[key],
                    dict,
                )
                and isinstance(
                    value,
                    dict,
                )
            ):
                result[key] = (
                    SettingsManager.merge_defaults(
                        result[key],
                        value,
                    )
                )

            else:
                result[key] = value

        return result

    def save(self) -> None:
        atomic_write(
            SETTINGS_FILE,
            json.dumps(
                self.settings,
                indent=2,
            ),
        )

    @property
    def active_profile_name(
        self,
    ) -> str:
        return self.settings.get(
            "active_profile",
            "default",
        )

    @property
    def profiles(self) -> dict:
        return self.settings.get(
            "profiles",
            {},
        )

    @property
    def profile(self) -> dict:
        active = (
            self.active_profile_name
        )

        profiles = self.profiles

        if active not in profiles:
            return profiles[
                "default"
            ]

        return profiles[active]

    def reload(self) -> None:
        loaded = (
            SettingsManager.load()
        )

        self.settings = (
            loaded.settings
        )

    def reset(self) -> None:
        self.settings = (
            DEFAULT_SETTINGS
        )

        self.save()