"""
Configuration for Curator.

Two stores, by responsibility:

1. Global config (``.Curator.!gtag`` next to Curator.py) — **application data
   only**: window state, MRU folders, and the pointers to where the pool and the
   Filmotéka output live (``pool_dir`` / ``filmoteka_dir``). Those pointers must
   stay here because the pool index is found *through* them.
2. Pool index (``<pool>/.Curator.!index``, see ``pool_index.py``) — everything
   describing a particular library: per-movie metadata **and** library-level
   settings (``tag_schema``, ``copyasis_folders``). It travels with the pool.
"""
import json
from pathlib import Path

# Global config file (next to the main script)
GLOBAL_CONFIG_FILE = Path(__file__).parent.parent.parent / ".Curator.!gtag"


# =============================================================================
# TAG SCHEMA - default library settings (stored per-pool in the index)
# =============================================================================

# Tag schema: the single source of truth for which tag categories exist, how
# they are derived from ČSFD, and how they map to the Filmotéka folder tree.
# Each entry:
#   category       — tag category name (e.g. "Žánr")
#   csfd_field     — NFO source field feeding it (genres / year / countries /
#                    rating), or None for a user-only category. (Key name kept for
#                    index compatibility; the data now comes from the NFO.)
#   transform      — named value transform: None (str) or "decade_band" (rating)
#   filmoteka_root — folder under the output: "" = at the root (e.g. genres),
#                    "Dle X" = grouping folder, None = filterable but no folders
#   filename_template — optional per-category hardlink name used only inside this
#                    category's folders (e.g. "{year} - {title}{ext}"); fields:
#                    title / year / rating / ext / stem / filename. Absent/None =
#                    keep the pool filename. Pool files are never renamed by this.
# Grouping folders are prefixed with "- " so DLNA/TV browsers sort the special
# folders (Dle …, Tipy dne, Nově přidané) before the genre folders at the root.
# This lives in the code as the default; the effective schema is stored per-pool
# in the index (``PoolIndex.settings["tag_schema"]``).
DEFAULT_TAG_SCHEMA = [
    {"category": "Žánr", "csfd_field": "genres", "transform": None, "filmoteka_root": ""},
    {"category": "Rok", "csfd_field": "year", "transform": None, "filmoteka_root": "- Dle roku"},
    {"category": "Země původu", "csfd_field": "countries", "transform": None,
     "filmoteka_root": "- Dle země původu"},
    {"category": "Hodnocení", "csfd_field": "rating", "transform": "decade_band",
     "filmoteka_root": "- Dle hodnocení"},
]


# =============================================================================
# GLOBAL CONFIG - Application settings only
# =============================================================================

DEFAULT_GLOBAL_CONFIG = {
    "window_geometry": "1200x800",
    "window_maximized": False,
    "last_folder": None,
    "sidebar_width": 250,
    "recent_folders": [],
    "pool_dir": None,        # managed pool root (single source of truth)
    "filmoteka_dir": None,   # generated Filmotéka output (hardlink tree)
}


def load_global_config() -> dict:
    """Load global application config"""
    if GLOBAL_CONFIG_FILE.exists():
        try:
            with open(GLOBAL_CONFIG_FILE, "r", encoding="utf-8") as f:
                config = json.load(f)
                # Merge with defaults for any missing keys
                for key, value in DEFAULT_GLOBAL_CONFIG.items():
                    if key not in config:
                        config[key] = value
                return config
        except Exception:
            return DEFAULT_GLOBAL_CONFIG.copy()
    return DEFAULT_GLOBAL_CONFIG.copy()


def save_global_config(cfg: dict):
    """Save global application config"""
    with open(GLOBAL_CONFIG_FILE, "w", encoding="utf-8") as f:
        json.dump(cfg, f, indent=2, ensure_ascii=False)


# =============================================================================
# BACKWARDS COMPATIBILITY
# =============================================================================

def load_config():
    """Legacy function - returns global config"""
    return load_global_config()


def save_config(cfg: dict):
    """Legacy function - saves global config"""
    save_global_config(cfg)