"""Shared Django settings for all environments."""

import json
import os
import sys
from pathlib import Path
from urllib.parse import urlparse

BASE_DIR = Path(__file__).resolve().parent.parent.parent


def env(key: str, default: str | None = None) -> str | None:
    return os.environ.get(key, default)


def env_bool(key: str, default: bool = False) -> bool:
    value = os.environ.get(key)
    if value is None:
        return default
    return value.lower() in {"1", "true", "yes", "on"}


def env_list(key: str, default: str = "") -> list[str]:
    value = os.environ.get(key, default)
    if not value:
        return []
    value = value.strip()
    if value.startswith("["):
        try:
            parsed = json.loads(value)
        except ValueError:
            parsed = None
        if isinstance(parsed, list):
            return [str(item).strip() for item in parsed if str(item).strip()]
    return [item.strip() for item in value.split(",") if item.strip()]


def database_config() -> dict:
    database_url = env("DATABASE_URL")
    if database_url:
        parsed = urlparse(database_url)
        return {
            "default": {
                "ENGINE": "django.db.backends.postgresql",
                "NAME": parsed.path.lstrip("/"),
                "USER": parsed.username or "",
                "PASSWORD": parsed.password or "",
                "HOST": parsed.hostname or "",
                "PORT": str(parsed.port or 5432),
            }
        }

    if env("DB_HOST"):
        return {
            "default": {
                "ENGINE": "django.db.backends.postgresql",
                "NAME": env("DB_NAME", "client_site"),
                "USER": env("DB_USER", "client_site"),
                "PASSWORD": env("DB_PASSWORD", ""),
                "HOST": env("DB_HOST"),
                "PORT": env("DB_PORT", "5432"),
            }
        }

    return {
        "default": {
            "ENGINE": "django.db.backends.sqlite3",
            "NAME": BASE_DIR / "db.sqlite3",
        }
    }


def build_csrf_trusted_origins(
    allowed_hosts: list[str], explicit: list[str] | None = None
) -> list[str]:
    """Build CSRF_TRUSTED_ORIGINS for Django 4+ Origin checks on HTTPS POSTs."""
    if explicit:
        return explicit

    local_hosts = {"localhost", "127.0.0.1", "0.0.0.0"}
    origins: list[str] = []
    for host in allowed_hosts:
        if not host or host == "*" or host.startswith("."):
            continue
        hostname = host.split(":")[0]
        scheme = "http" if hostname in local_hosts else "https"
        origins.append(f"{scheme}://{host}")
    return origins


SECRET_KEY = env(
    "DJANGO_SECRET_KEY",
    "django-insecure-dev-only-change-me-before-production",
)

DEBUG = env_bool("DJANGO_DEBUG", False)

allowed_hosts = env_list("DJANGO_ALLOWED_HOSTS", "*")
ALLOWED_HOSTS = allowed_hosts if allowed_hosts else ["*"]

CSRF_TRUSTED_ORIGINS = build_csrf_trusted_origins(
    ALLOWED_HOSTS,
    env_list("DJANGO_CSRF_TRUSTED_ORIGINS"),
)

from django.core.exceptions import ImproperlyConfigured

# Catalog feature flags. Secret env is the source of truth.
# Dev/test default ON so the template is a working seed; prod/beta secrets
# must set each flag explicitly (see scripts/validate-env.sh).
_feature_default = os.environ.get("DJANGO_ENV", "dev").lower() not in {"prod", "beta"}
FEATURE_EMAIL_SMS = env_bool("FEATURE_EMAIL_SMS", _feature_default)
FEATURE_DIRECT_MAIL = env_bool("FEATURE_DIRECT_MAIL", _feature_default)
FEATURE_BLOG = env_bool("FEATURE_BLOG", _feature_default)
FEATURE_PAYMENTS = env_bool("FEATURE_PAYMENTS", _feature_default)
FEATURE_SOCIAL = env_bool("FEATURE_SOCIAL", _feature_default)
FEATURE_SOCIAL_AI = env_bool("FEATURE_SOCIAL_AI", _feature_default)
FEATURE_SHOP = env_bool("FEATURE_SHOP", _feature_default)
FEATURE_POS_SYNC = env_bool("FEATURE_POS_SYNC", _feature_default)
FEATURE_EVENTS = env_bool("FEATURE_EVENTS", _feature_default)
FEATURE_SHIPPING = env_bool("FEATURE_SHIPPING", _feature_default)

if FEATURE_PAYMENTS and not FEATURE_EMAIL_SMS:
    raise ImproperlyConfigured("FEATURE_PAYMENTS requires FEATURE_EMAIL_SMS")
if FEATURE_SOCIAL_AI and not FEATURE_SOCIAL:
    raise ImproperlyConfigured("FEATURE_SOCIAL_AI requires FEATURE_SOCIAL")
if FEATURE_SHOP and not FEATURE_EMAIL_SMS:
    raise ImproperlyConfigured("FEATURE_SHOP requires FEATURE_EMAIL_SMS")
if FEATURE_SHOP and not FEATURE_PAYMENTS:
    raise ImproperlyConfigured("FEATURE_SHOP requires FEATURE_PAYMENTS")
if FEATURE_POS_SYNC and not FEATURE_SHOP:
    raise ImproperlyConfigured("FEATURE_POS_SYNC requires FEATURE_SHOP")
if FEATURE_EVENTS and not FEATURE_EMAIL_SMS:
    raise ImproperlyConfigured("FEATURE_EVENTS requires FEATURE_EMAIL_SMS")
if FEATURE_EVENTS and not FEATURE_PAYMENTS:
    raise ImproperlyConfigured("FEATURE_EVENTS requires FEATURE_PAYMENTS")
if FEATURE_SHIPPING and not FEATURE_SHOP:
    raise ImproperlyConfigured("FEATURE_SHIPPING requires FEATURE_SHOP")

CORE_APPS = [
    "core.apps.CoreConfig",
    "public.apps.PublicConfig",
    "accounts.apps.AccountsConfig",
    "dashboard.apps.DashboardConfig",
    "leads.apps.LeadsConfig",
    "contacts.apps.ContactsConfig",
    "analytics.apps.AnalyticsConfig",
]
OPTIONAL_APPS = [
    (FEATURE_EMAIL_SMS, "email_sms.apps.EmailSmsConfig"),
    (FEATURE_DIRECT_MAIL, "directmail.apps.DirectmailConfig"),
    (FEATURE_BLOG, "blog.apps.BlogConfig"),
    (FEATURE_PAYMENTS, "payments.apps.PaymentsConfig"),
    (FEATURE_SOCIAL, "social.apps.SocialConfig"),
    (FEATURE_SOCIAL_AI, "social_ai.apps.SocialAiConfig"),
    (FEATURE_SHOP, "shop.apps.ShopConfig"),
    (FEATURE_POS_SYNC, "pos_sync.apps.PosSyncConfig"),
    (FEATURE_EVENTS, "events.apps.EventsConfig"),
    (FEATURE_SHIPPING, "shipping.apps.ShippingConfig"),
]
DJANGO_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "whitenoise.runserver_nostatic",
    "django.contrib.staticfiles",
    "phonenumber_field",
    "django_recaptcha",
    "dj_queue",
]
INSTALLED_APPS = (
    CORE_APPS
    + [app for enabled, app in OPTIONAL_APPS if enabled]
    + DJANGO_APPS
)

MIDDLEWARE = [
    "django.middleware.security.SecurityMiddleware",
    "whitenoise.middleware.WhiteNoiseMiddleware",
    "django.contrib.sessions.middleware.SessionMiddleware",
    "django.middleware.common.CommonMiddleware",
    "django.middleware.csrf.CsrfViewMiddleware",
    "django.contrib.auth.middleware.AuthenticationMiddleware",
    "accounts.middleware.PortalStaffMiddleware",
    "django.contrib.messages.middleware.MessageMiddleware",
    "django.middleware.clickjacking.XFrameOptionsMiddleware",
    "analytics.middleware.UTMTrackingMiddleware",
    "analytics.middleware.PublicPageViewMiddleware",
    "public.middleware.UnderConstructionMiddleware",
]

ROOT_URLCONF = "client_site.urls"

TEMPLATES = [
    {
        "BACKEND": "django.template.backends.django.DjangoTemplates",
        "DIRS": [BASE_DIR / "client_site" / "templates"],
        "APP_DIRS": True,
        "OPTIONS": {
            "context_processors": [
                "django.template.context_processors.debug",
                "django.template.context_processors.request",
                "django.contrib.auth.context_processors.auth",
                "django.contrib.messages.context_processors.messages",
                "public.context_processors.site_branding",
                "public.context_processors.tianji_tracking",
                "core.context_processors.feature_registry",
            ],
        },
    },
]

WSGI_APPLICATION = "client_site.wsgi.application"

DATABASES = database_config()

AUTH_PASSWORD_VALIDATORS = [
    {
        "NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator",
    },
    {
        "NAME": "django.contrib.auth.password_validation.MinimumLengthValidator",
    },
    {
        "NAME": "django.contrib.auth.password_validation.CommonPasswordValidator",
    },
    {
        "NAME": "django.contrib.auth.password_validation.NumericPasswordValidator",
    },
]

LANGUAGE_CODE = "en-us"
TIME_ZONE = "America/Chicago"
USE_I18N = True
USE_TZ = True

STATIC_URL = "static/"
STATIC_ROOT = BASE_DIR / "staticfiles"
STATICFILES_DIRS = [
    BASE_DIR / "client_site" / "static",
]
# Uploaded blobs live in the DB (core.StoredFile). Default storage is
# in-memory only so nothing is written to disk accidentally.
STORAGES = {
    "default": {
        "BACKEND": "django.core.files.storage.memory.InMemoryStorage",
    },
    "staticfiles": {
        "BACKEND": "whitenoise.storage.CompressedManifestStaticFilesStorage",
    },
}

DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"

LOGIN_URL = "accounts:login"
LOGIN_REDIRECT_URL = "dashboard:home"
LOGOUT_REDIRECT_URL = "accounts:login"

# --- Feature gates ---
# When true, public visitors only see the under-construction page.
# Prod launch holding page: SITE_UNDER_CONSTRUCTION=true
# Beta (full app): SITE_UNDER_CONSTRUCTION=false
SITE_UNDER_CONSTRUCTION = env_bool("SITE_UNDER_CONSTRUCTION", False)

# --- Branding / public site ---
SITE_NAME = env("SITE_NAME", "Your Company")
SITE_TAGLINE = env("SITE_TAGLINE", "A tagline for the public site")
PUBLIC_SITE_URL = env("PUBLIC_SITE_URL", "")
CONTACT_PHONE = env("CONTACT_PHONE", "")
CONTACT_EMAIL = env("CONTACT_EMAIL", "hello@example.com")
CONTACT_ADDRESS = env("CONTACT_ADDRESS", "")
CONTACT_SERVICE_AREA = env("CONTACT_SERVICE_AREA", "")
CREDIT_NAME = env("CREDIT_NAME", "AI ML Operations, LLC")
CREDIT_URL = env("CREDIT_URL", "https://aimloperations.com")


def format_from_email(address: str | None, display_name: str | None = None) -> str:
    """
    Ensure From header includes a display name for inbox UIs.

    Bare ``noreply@…`` shows as "noreply". Prefer
    ``"Your Company" <noreply@…>`` (RFC 5322).

    Docker Compose ``.env`` cannot parse split quotes like
    ``"Name" <addr>`` — use a bare address (this helper adds SITE_NAME)
    or one pair of quotes around the whole value:
    ``DEFAULT_FROM_EMAIL="Your Company <addr@domain>"``.
    """
    raw = (address or "").strip()
    if not raw:
        return ""
    # Strip a single layer of wrapping quotes from env/compose.
    if len(raw) >= 2 and raw[0] == raw[-1] and raw[0] in {'"', "'"}:
        raw = raw[1:-1].strip()
    if "<" in raw and ">" in raw:
        return raw
    name = (display_name or SITE_NAME or "").strip()
    if not name:
        return raw
    safe = name.replace("\\", "\\\\").replace('"', '\\"')
    return f'"{safe}" <{raw}>'


# Inbox "From" — not the same as EMAIL_HOST_USER (SMTP login).
DEFAULT_FROM_EMAIL = format_from_email(
    env("DEFAULT_FROM_EMAIL", "noreply@example.com")
)

# --- reCAPTCHA v3 ---
RECAPTCHA_PUBLIC_KEY = env("RECAPTCHA_PUBLIC_KEY", "")
RECAPTCHA_PRIVATE_KEY = env("RECAPTCHA_PRIVATE_KEY", "")

# --- Email (SMTP2GO) ---
EMAIL_HOST = env("EMAIL_HOST", "mail.smtp2go.com")
EMAIL_HOST_USER = env("EMAIL_HOST_USER", "")
EMAIL_HOST_PASSWORD = env("EMAIL_HOST_PASSWORD", "")
EMAIL_PORT = int(env("EMAIL_PORT", "2525") or "2525")
EMAIL_USE_TLS = env_bool("EMAIL_USE_TLS", True)
EMAIL_BACKEND = env(
    "EMAIL_BACKEND",
    "django.core.mail.backends.smtp.EmailBackend",
)

# --- SMTP2GO SMS ---
SMTP2GO_SMS_API_KEY = env("SMTP2GO_SMS_API_KEY", "")
SMTP2GO_SMS_API_URL = env(
    "SMTP2GO_SMS_API_URL",
    "https://api.smtp2go.com/v3/sms/send",
)
# Optional shared secret: ?token=… or Authorization: Bearer …
SMTP2GO_WEBHOOK_SECRET = env("SMTP2GO_WEBHOOK_SECRET", "")

# --- Postcards (PCM Integrations default) ---
POSTCARD_PROVIDER = env("POSTCARD_PROVIDER", "pcm")
# Login credentials for POST /auth/login → short-lived Bearer token.
PCM_API_KEY = env("PCM_API_KEY", "")
PCM_API_SECRET = env("PCM_API_SECRET", "")
# Optional child-app reference for PCM multi-account (childRefNbr).
PCM_CHILD_REF_NBR = env("PCM_CHILD_REF_NBR", "")
# PCM webhook auth: each subscription has its own signature secret (copy from PCM UI).
# Prefer PCM_WEBHOOK_SECRETS=sec1,sec2,… ; PCM_WEBHOOK_SECRET still accepted (single).
PCM_WEBHOOK_SECRETS = env("PCM_WEBHOOK_SECRETS", "")
PCM_WEBHOOK_SECRET = env("PCM_WEBHOOK_SECRET", "")
# JSON object: company, firstName, lastName, address, address2, city, state, zipCode
PCM_RETURN_ADDRESS = env("PCM_RETURN_ADDRESS", "")
PCM_RETURN_LINE1 = env("PCM_RETURN_LINE1", "")
PCM_RETURN_LINE2 = env("PCM_RETURN_LINE2", "")
PCM_RETURN_CITY = env("PCM_RETURN_CITY", "")
PCM_RETURN_STATE = env("PCM_RETURN_STATE", "")
PCM_RETURN_ZIP = env("PCM_RETURN_ZIP", "")
# Legacy / alternate providers (POSTCARD_PROVIDER=lob|click2mail|postgrid)
LOB_API_KEY = env("LOB_API_KEY", "")
CLICK2MAIL_API_KEY = env("CLICK2MAIL_API_KEY", "")
POSTGRID_API_KEY = env("POSTGRID_API_KEY", "")

# --- Social (native APIs) ---
META_APP_ID = env("META_APP_ID", "")
META_APP_SECRET = env("META_APP_SECRET", "")
# LinkedIn Client ID/Secret live in SocialAppCredentials (portal UI), not env.
SOCIAL_TOKEN_ENCRYPTION_KEY = env("SOCIAL_TOKEN_ENCRYPTION_KEY", "")

# --- Ollama (social post drafting) ---
# Host-network reachable from app hosts; default matches internal LAN Ollama.
OLLAMA_BASE_URL = env("OLLAMA_BASE_URL", "http://10.0.0.128:11434")
OLLAMA_MODEL = env("OLLAMA_MODEL", "llama3.2")
OLLAMA_TIMEOUT_SECONDS = int(env("OLLAMA_TIMEOUT_SECONDS", "120") or "120")

# --- Stripe (FEATURE_PAYMENTS) ---
STRIPE_SECRET_KEY = env("STRIPE_SECRET_KEY", "")
STRIPE_PUBLISHABLE_KEY = env("STRIPE_PUBLISHABLE_KEY", "")
STRIPE_WEBHOOK_SECRET = env("STRIPE_WEBHOOK_SECRET", "")
STRIPE_CURRENCY = env("STRIPE_CURRENCY", "usd")

# --- Shop / POS / shipping (FEATURE_SHOP and add-ons) ---
# 0 = unlimited made-to-order print queue.
SHOP_PRINT_QUEUE_LIMIT_MINUTES = int(
    env("SHOP_PRINT_QUEUE_LIMIT_MINUTES", "0") or "0"
)
POS_WEBHOOK_SECRET = env("POS_WEBHOOK_SECRET", "")
POS_API_BASE_URL = env("POS_API_BASE_URL", "")
POS_API_TOKEN = env("POS_API_TOKEN", "")
EASYPOST_API_KEY = env("EASYPOST_API_KEY", "")
EASYPOST_WEBHOOK_SECRET = env("EASYPOST_WEBHOOK_SECRET", "")
SHIP_FROM_LINE1 = env("SHIP_FROM_LINE1", "")
SHIP_FROM_CITY = env("SHIP_FROM_CITY", "")
SHIP_FROM_STATE = env("SHIP_FROM_STATE", "")
SHIP_FROM_ZIP = env("SHIP_FROM_ZIP", "")

# --- Nominatim (address suggest; server-side proxy only) ---
# Self-hosted on ai-server-4080. Nominatim has no native API keys — gate with
# LAN UFW + this Django proxy. Optional NOMINATIM_API_KEY is forwarded as
# X-API-Key if you later put auth in front of Nominatim.
NOMINATIM_BASE_URL = env("NOMINATIM_BASE_URL", "http://10.0.0.128:8089")
NOMINATIM_TIMEOUT_SECONDS = int(env("NOMINATIM_TIMEOUT_SECONDS", "8") or "8")
NOMINATIM_COUNTRY_CODES = env("NOMINATIM_COUNTRY_CODES", "us")
NOMINATIM_USER_AGENT = env(
    "NOMINATIM_USER_AGENT",
    "client_site/1.0 (address-suggest; contact admin)",
)
NOMINATIM_API_KEY = env("NOMINATIM_API_KEY", "")

# --- URL shortener (piha.li) ---
# Call the API host, never the public short domain. Empty = skip minting
# (composer falls back to the long UTM URL). Token format: name:secret.
# Required in beta/prod when FEATURE_EMAIL_SMS or FEATURE_DIRECT_MAIL is on.
SHORTENER_BASE_URL = env("SHORTENER_BASE_URL", "")
SHORTENER_API_TOKEN = env("SHORTENER_API_TOKEN", "")
SHORTENER_TIMEOUT_SECONDS = int(env("SHORTENER_TIMEOUT_SECONDS", "10") or "10")
# Optional override for utm_source. Empty → slug of SITE_NAME.
UTM_SOURCE = env("UTM_SOURCE", "")
# manage.py test must not mint against a live API (env often has prod tokens).
if "test" in sys.argv:
    SHORTENER_BASE_URL = ""
    SHORTENER_API_TOKEN = ""

# --- Tianji analytics (pageviews + events; notice banner, not opt-in) ---
TIANJI_ENABLED = env_bool("TIANJI_ENABLED", not DEBUG)
TIANJI_TRACKER_URL = env(
    "TIANJI_TRACKER_URL",
    "https://tianji.aimloperations.com/tracker.js",
)
TIANJI_WEBSITE_ID = env("TIANJI_WEBSITE_ID", "cmshzhxdf6gee10qzkzrfn9iw")

# --- Django Tasks ---
# Dev: ImmediateBackend (settings/dev.py). Beta/prod: dj-queue (settings/beta.py|prod.py).
TASKS = {
    "default": {
        "BACKEND": "django.tasks.backends.immediate.ImmediateBackend",
    },
}