"""
Constants are for things that never change at runtime.
(but they can change from run-to-run or machine-to-machine)

DATA_DIR will never change at runtime, but you can run
archivebox from inside a different DATA_DIR on the same machine.

This is loaded very early in the archivebox startup flow, so nothing in this file 
or imported from this file should import anything from archivebox.config.common, 
django, other INSTALLED_APPS, or anything else that is not in a standard library.
"""

__package__ = 'archivebox.config'

import re
import sys

from typing import Dict
from pathlib import Path
from collections.abc import Mapping

from benedict import benedict

from archivebox.misc.logging import DEFAULT_CLI_COLORS

from .paths import (
    PACKAGE_DIR,
    DATA_DIR,
    ARCHIVE_DIR,
    get_collection_id,
    get_machine_id,
    get_machine_type,
)
from .permissions import (
    IS_ROOT,
    IN_DOCKER,
    RUNNING_AS_UID,
    RUNNING_AS_GID,
    DEFAULT_PUID,
    DEFAULT_PGID,
    ARCHIVEBOX_USER,
    ARCHIVEBOX_GROUP,
)
from .version import detect_installed_version

###################### Config ##########################


class ConstantsDict(Mapping):
    PACKAGE_DIR: Path                   = PACKAGE_DIR
    DATA_DIR: Path                      = DATA_DIR
    ARCHIVE_DIR: Path                   = ARCHIVE_DIR
    
    MACHINE_TYPE: str                   = get_machine_type()
    MACHINE_ID: str                     = get_machine_id()
    COLLECTION_ID: str                  = get_collection_id(DATA_DIR)
    
    # Host system
    VERSION: str                        = detect_installed_version(PACKAGE_DIR)
    IN_DOCKER: bool                     = IN_DOCKER
    
    # Permissions
    IS_ROOT: bool                       = IS_ROOT
    ARCHIVEBOX_USER: int                = ARCHIVEBOX_USER
    ARCHIVEBOX_GROUP: int               = ARCHIVEBOX_GROUP
    RUNNING_AS_UID: int                 = RUNNING_AS_UID
    RUNNING_AS_GID: int                 = RUNNING_AS_GID
    DEFAULT_PUID: int                   = DEFAULT_PUID
    DEFAULT_PGID: int                   = DEFAULT_PGID
    IS_INSIDE_VENV: bool                = sys.prefix != sys.base_prefix
    
    # Source code dirs
    PACKAGE_DIR_NAME: str               = PACKAGE_DIR.name
    TEMPLATES_DIR_NAME: str             = 'templates'
    TEMPLATES_DIR: Path                 = PACKAGE_DIR / TEMPLATES_DIR_NAME
    STATIC_DIR_NAME: str                = 'static'
    STATIC_DIR: Path                    = TEMPLATES_DIR / STATIC_DIR_NAME

    # Data dirs
    ARCHIVE_DIR_NAME: str               = 'archive'
    SOURCES_DIR_NAME: str               = 'sources'
    PERSONAS_DIR_NAME: str              = 'personas'
    CRONTABS_DIR_NAME: str              = 'crontabs'
    CACHE_DIR_NAME: str                 = 'cache'
    LOGS_DIR_NAME: str                  = 'logs'
    USER_PLUGINS_DIR_NAME: str          = 'user_plugins'
    CUSTOM_TEMPLATES_DIR_NAME: str      = 'user_templates'
    ARCHIVE_DIR: Path                   = DATA_DIR / ARCHIVE_DIR_NAME
    SOURCES_DIR: Path                   = DATA_DIR / SOURCES_DIR_NAME
    PERSONAS_DIR: Path                  = DATA_DIR / PERSONAS_DIR_NAME
    LOGS_DIR: Path                      = DATA_DIR / LOGS_DIR_NAME
    CACHE_DIR: Path                     = DATA_DIR / CACHE_DIR_NAME
    CUSTOM_TEMPLATES_DIR: Path          = DATA_DIR / CUSTOM_TEMPLATES_DIR_NAME
    USER_PLUGINS_DIR: Path              = DATA_DIR / USER_PLUGINS_DIR_NAME

    # Data dir files
    CONFIG_FILENAME: str                = 'ArchiveBox.conf'
    SQL_INDEX_FILENAME: str             = 'index.sqlite3'
    CONFIG_FILE: Path                   = DATA_DIR / CONFIG_FILENAME
    DATABASE_FILE: Path                 = DATA_DIR / SQL_INDEX_FILENAME
    
    JSON_INDEX_FILENAME: str            = 'index.json'
    HTML_INDEX_FILENAME: str            = 'index.html'
    ROBOTS_TXT_FILENAME: str            = 'robots.txt'
    FAVICON_FILENAME: str               = 'favicon.ico'
    
    # Runtime dirs
    TMP_DIR_NAME: str                   = 'tmp'
    DEFAULT_TMP_DIR: Path               = DATA_DIR / TMP_DIR_NAME / MACHINE_ID    # ./data/tmp/abc3244323
    
    LIB_DIR_NAME: str                   = 'lib'
    DEFAULT_LIB_DIR: Path               = DATA_DIR / LIB_DIR_NAME / MACHINE_TYPE  # ./data/lib/arm64-linux-docker

    # Config constants
    TIMEZONE: str                       = 'UTC'
    DEFAULT_CLI_COLORS: Dict[str, str]  = DEFAULT_CLI_COLORS
    DISABLED_CLI_COLORS: Dict[str, str] = benedict({k: '' for k in DEFAULT_CLI_COLORS})

    ALLOWDENYLIST_REGEX_FLAGS: int      = re.IGNORECASE | re.UNICODE | re.MULTILINE

    STATICFILE_EXTENSIONS: frozenset[str] = frozenset((
        # 99.999% of the time, URLs ending in these extensions are static files
        # that can be downloaded as-is, not html pages that need to be rendered
        'gif', 'jpeg', 'jpg', 'png', 'tif', 'tiff', 'wbmp', 'ico', 'jng', 'bmp',
        'svg', 'svgz', 'webp', 'ps', 'eps', 'ai',
        'mp3', 'mp4', 'm4a', 'mpeg', 'mpg', 'mkv', 'mov', 'webm', 'm4v',
        'flv', 'wmv', 'avi', 'ogg', 'ts', 'm3u8',
        'pdf', 'txt', 'rtf', 'rtfd', 'doc', 'docx', 'ppt', 'pptx', 'xls', 'xlsx',
        'atom', 'rss', 'css', 'js', 'json',
        'dmg', 'iso', 'img',
        'rar', 'war', 'hqx', 'zip', 'gz', 'bz2', '7z',

        # Less common extensions to consider adding later
        # jar, swf, bin, com, exe, dll, deb
        # ear, hqx, eot, wmlc, kml, kmz, cco, jardiff, jnlp, run, msi, msp, msm,
        # pl pm, prc pdb, rar, rpm, sea, sit, tcl tk, der, pem, crt, xpi, xspf,
        # ra, mng, asx, asf, 3gpp, 3gp, mid, midi, kar, jad, wml, htc, mml

        # These are always treated as pages, not as static files, never add them:
        # html, htm, shtml, xhtml, xml, aspx, php, cgi
    ))

    PIP_RELATED_NAMES: frozenset[str] = frozenset((
        ".venv",
        "venv",
        "virtualenv",
        ".virtualenv",
    ))
    NPM_RELATED_NAMES: frozenset[str] = frozenset((
        "node_modules",
        "package.json",
        "package-lock.json",
        "yarn.lock",
    ))

    # When initializing archivebox in a new directory, we check to make sure the dir is
    # actually empty so that we dont clobber someone's home directory or desktop by accident.
    # These files are exceptions to the is_empty check when we're trying to init a new dir,
    # as they could be from a previous archivebox version, system artifacts, dependencies, etc.
    ALLOWED_IN_DATA_DIR: frozenset[str] = frozenset((
        *PIP_RELATED_NAMES,
        *NPM_RELATED_NAMES,
        
        ### Dirs:
        ARCHIVE_DIR_NAME,
        SOURCES_DIR_NAME,
        LOGS_DIR_NAME,
        CACHE_DIR_NAME,
        LIB_DIR_NAME,
        TMP_DIR_NAME,
        PERSONAS_DIR_NAME,
        CUSTOM_TEMPLATES_DIR_NAME,
        USER_PLUGINS_DIR_NAME,
        CRONTABS_DIR_NAME,
        "static",                # created by old static exports <v0.6.0
        "sonic",                 # created by docker bind mount / sonic FTS process
        ".git",
        ".svn",
        
        ### Files:
        CONFIG_FILENAME,
        SQL_INDEX_FILENAME,
        f"{SQL_INDEX_FILENAME}-wal",
        f"{SQL_INDEX_FILENAME}-shm",
        "search.sqlite3",
        "queue.sqlite3",
        "queue.sqlite3-wal",
        "queue.sqlite3-shm",
        JSON_INDEX_FILENAME,
        HTML_INDEX_FILENAME,
        ROBOTS_TXT_FILENAME,
        FAVICON_FILENAME,
        CONFIG_FILENAME,
        f"{CONFIG_FILENAME}.bak",
        f".{CONFIG_FILENAME}.bak",
        "static_index.json",
        ".DS_Store",
        ".gitignore",
        "lost+found",
        ".DS_Store",
        ".env",
        ".collection_id",
        ".archivebox_id",
        "Dockerfile",
    ))
        

    @classmethod
    def __getitem__(cls, key: str):
        # so it behaves like a dict[key] == dict.key or object attr
        return getattr(cls, key)
    
    @classmethod
    def __benedict__(cls):
        # when casting to benedict, only include uppercase keys that don't start with an underscore
        return benedict({key: value for key, value in cls.__dict__.items() if key.isupper() and not key.startswith('_')})
    
    @classmethod
    def __len__(cls):
        return len(cls.__benedict__())

    @classmethod
    def __iter__(cls):
        return iter(cls.__benedict__())

CONSTANTS = ConstantsDict()
CONSTANTS_CONFIG = CONSTANTS.__benedict__()

# add all key: values to globals() for easier importing, e.g.:
# from archivebox.config.constants import IS_ROOT, PERSONAS_DIR, ...
# globals().update(CONSTANTS)
