import json, requests
from typing import Dict, List, Optional
from app.db_sql import sql_select, sql_update, sql_insert
from app.lib_general import log, logging, logger_reset

# ---------------------------------------------------------------------------
# Novi-Mailman Bridge
# Synchronizes Novi AMS membership data with Mailman 3 mailing lists.
#
# Credential Storage (data_store table):
#   code='novi_api_config'     → JSON: { "api_key": "...", "base_url": "https://..." }
#   code='mailman_api_config'  → JSON: { "base_url": "http://...:8001", "username": "...", "password": "..." }
#
# Sync Logic:
#   - Active Novi members → subscribed in target Mailman list(s)
#   - Lapsed/expired members → unsubscribed (or held, depending on policy)
#   - Driven by webhooks (Novi membership events) + optional full-sync
# ---------------------------------------------------------------------------

# ── Credential Helpers ────────────────────────────────────────────────────

@logger_reset
def _load_novi_config() -> Optional[Dict]:
    """Load Novi AMS API credentials from data_store (code='novi_api_config')."""
    rec = sql_select(table_name='data_store', field_name='code', field_value='novi_api_config')
    if not rec:
        log.error("Novi API config not found in data_store (code='novi_api_config').")
        return None
    try:
        return json.loads(rec['text'])
    except Exception as e:
        log.error(f"Failed to parse Novi config: {e}")
        return None


@logger_reset
def _load_mailman_config() -> Optional[Dict]:
    """Load Mailman 3 REST API credentials from data_store (code='mailman_api_config')."""
    rec = sql_select(table_name='data_store', field_name='code', field_value='mailman_api_config')
    if not rec:
        log.error("Mailman API config not found in data_store (code='mailman_api_config').")
        return None
    try:
        return json.loads(rec['text'])
    except Exception as e:
        log.error(f"Failed to parse Mailman config: {e}")
        return None


# ── Novi AMS Methods ──────────────────────────────────────────────────────

@logger_reset
def test_novi_connection() -> Dict:
    """
    Verify Novi AMS API credentials are valid.
    Returns a dict with 'ok' bool and optional error message.
    """
    config = _load_novi_config()
    if not config:
        return {"ok": False, "error": "Credentials not configured."}

    # Novi uses Basic auth with a Base64-encoded API key.
    # Confirmed from IDAA Jitsi integration: Authorization: Basic {api_key}
    base_url = config.get('base_url', '').rstrip('/')
    api_key  = config.get('api_key', '')
    headers  = {"Authorization": f"Basic {api_key}", "Accept": "application/json"}

    try:
        resp = requests.get(f"{base_url}/api/v1/members", headers=headers, params={"$top": 1}, timeout=10)
        if resp.status_code == 200:
            return {"ok": True}
        return {"ok": False, "error": f"HTTP {resp.status_code}: {resp.text[:200]}"}
    except Exception as e:
        log.exception(f"Novi connection test failed: {e}")
        return {"ok": False, "error": str(e)}


@logger_reset
def get_novi_members(status_filter: Optional[str] = None, page_size: int = 500, offset: int = 0) -> Optional[List[Dict]]:
    """
    Fetch member records from Novi AMS.

    Args:
        status_filter: Optional Novi membership status (e.g. 'Active', 'Lapsed').
                       None returns all members.
        page_size:     Records per page (Novi uses OData $top/$skip).
        offset:        Pagination offset ($skip).

    Returns:
        List of member dicts, or None on failure.

    TODO: Confirm OData filter field names against your Novi instance schema.
    """
    config = _load_novi_config()
    if not config:
        return None

    base_url = config.get('base_url', '').rstrip('/')
    api_key  = config.get('api_key', '')
    headers  = {"Authorization": f"Basic {api_key}", "Accept": "application/json"}
    params   = {"pageSize": page_size, "offset": offset}

    if status_filter:
        params["membershipStatus"] = status_filter

    # TODO: Confirm the bulk member list endpoint for this Novi instance.
    # The IDAA Jitsi code uses /customers/{uuid} for individual lookups and
    # /groups/{guid}/members for group membership. A bulk member list may be
    # /members, /customers, or require a group-based approach.
    try:
        resp = requests.get(f"{base_url}/members", headers=headers, params=params, timeout=30)
        if resp.status_code != 200:
            log.error(f"Novi API error: {resp.status_code} - {resp.text[:200]}")
            return None
        data = resp.json()
        # Novi may return array directly, or wrap in Results/Members key
        if isinstance(data, list):
            return data
        return data.get('Results') or data.get('Members') or data.get('value') or []
    except Exception as e:
        log.exception(f"Failed to fetch Novi members: {e}")
        return None


# ── Mailman 3 Methods ─────────────────────────────────────────────────────

@logger_reset
def test_mailman_connection() -> Dict:
    """
    Verify Mailman 3 REST API credentials are valid.
    Returns a dict with 'ok' bool and optional error message.
    """
    config = _load_mailman_config()
    if not config:
        return {"ok": False, "error": "Credentials not configured."}

    base_url = config.get('base_url', '').rstrip('/')
    auth     = (config.get('username', 'restadmin'), config.get('password', ''))

    try:
        resp = requests.get(f"{base_url}/3.1/system/versions", auth=auth, timeout=10)
        if resp.status_code == 200:
            return {"ok": True, "version": resp.json().get('mailman_version')}
        return {"ok": False, "error": f"HTTP {resp.status_code}: {resp.text[:200]}"}
    except Exception as e:
        log.exception(f"Mailman connection test failed: {e}")
        return {"ok": False, "error": str(e)}


@logger_reset
def get_mailman_lists() -> Optional[List[Dict]]:
    """
    Return all mailing lists from this Mailman 3 instance.
    """
    config = _load_mailman_config()
    if not config:
        return None

    base_url = config.get('base_url', '').rstrip('/')
    auth     = (config.get('username', 'restadmin'), config.get('password', ''))

    try:
        resp = requests.get(f"{base_url}/3.1/lists", auth=auth, timeout=10)
        if resp.status_code != 200:
            log.error(f"Mailman list fetch failed: {resp.status_code}")
            return None
        return resp.json().get('entries', [])
    except Exception as e:
        log.exception(f"Failed to fetch Mailman lists: {e}")
        return None


@logger_reset
def subscribe_member_to_list(list_id: str, email: str, display_name: str = '') -> bool:
    """
    Subscribe an email address to a Mailman 3 list.
    Uses pre-confirmed subscription (no confirmation email sent).

    Args:
        list_id:      Mailman list ID, e.g. 'members@yourdomain.org'
        email:        Member email address
        display_name: Optional display name

    Returns:
        True on success or already subscribed, False on error.
    """
    config = _load_mailman_config()
    if not config:
        return False

    base_url = config.get('base_url', '').rstrip('/')
    auth     = (config.get('username', 'restadmin'), config.get('password', ''))

    payload = {
        "list_id":            list_id.replace('@', '.'),  # Mailman uses dot notation for list IDs
        "subscriber":         email,
        "display_name":       display_name,
        "pre_verified":       True,
        "pre_confirmed":      True,
        "pre_approved":       True,
        "send_welcome_message": False,
    }

    try:
        resp = requests.post(f"{base_url}/3.1/members", auth=auth, json=payload, timeout=10)
        if resp.status_code in (200, 201):
            log.info(f"Subscribed {email} to {list_id}")
            return True
        if resp.status_code == 409:
            log.debug(f"{email} already subscribed to {list_id} — skipping.")
            return True  # Already a member, treat as success
        log.error(f"Subscribe failed for {email}: {resp.status_code} - {resp.text[:200]}")
        return False
    except Exception as e:
        log.exception(f"Error subscribing {email} to {list_id}: {e}")
        return False


@logger_reset
def unsubscribe_member_from_list(list_id: str, email: str) -> bool:
    """
    Unsubscribe an email address from a Mailman 3 list.

    Returns:
        True on success or not found (already unsubscribed), False on error.
    """
    config = _load_mailman_config()
    if not config:
        return False

    base_url = config.get('base_url', '').rstrip('/')
    auth     = (config.get('username', 'restadmin'), config.get('password', ''))
    list_id_dot = list_id.replace('@', '.')

    try:
        # Mailman member ID is {email}_{list_id} (base64 encoded in REST path)
        resp = requests.delete(
            f"{base_url}/3.1/lists/{list_id_dot}/member/{email}",
            auth=auth,
            timeout=10
        )
        if resp.status_code in (200, 204):
            log.info(f"Unsubscribed {email} from {list_id}")
            return True
        if resp.status_code == 404:
            log.debug(f"{email} not found in {list_id} — skipping.")
            return True  # Not a member, treat as success
        log.error(f"Unsubscribe failed for {email}: {resp.status_code} - {resp.text[:200]}")
        return False
    except Exception as e:
        log.exception(f"Error unsubscribing {email} from {list_id}: {e}")
        return False


# ── Sync Engine ───────────────────────────────────────────────────────────

@logger_reset
def sync_single_member(email: str, display_name: str, list_id: str, is_active: bool) -> str:
    """
    Sync one member's subscription state for a given Mailman list.

    Args:
        email:        Member email
        display_name: Member display name
        list_id:      Target Mailman list ID
        is_active:    True = subscribe, False = unsubscribe

    Returns:
        'subscribed', 'unsubscribed', or 'error'
    """
    if is_active:
        ok = subscribe_member_to_list(list_id, email, display_name)
        return 'subscribed' if ok else 'error'
    else:
        ok = unsubscribe_member_from_list(list_id, email)
        return 'unsubscribed' if ok else 'error'


@logger_reset
def sync_novi_to_mailman(list_id: str, active_status: str = 'Active') -> Optional[Dict]:
    """
    Full sync: pull all Novi members and reconcile their Mailman subscription state.

    - Novi members with `active_status` → subscribed to `list_id`
    - All other statuses → unsubscribed from `list_id`

    Args:
        list_id:       Target Mailman list ID (e.g. 'members@yourdomain.org')
        active_status: Novi membership status string that counts as active.

    Returns:
        Result dict with counts, or None on fatal error.

    TODO: Adjust the Novi member field names (Email, FirstName, LastName,
          MembershipStatus) to match your actual Novi instance schema.
    """
    log.info(f"Starting full Novi → Mailman sync for list: {list_id}")

    members = get_novi_members()
    if members is None:
        log.error("Novi member fetch failed — aborting sync.")
        return None

    log.info(f"Fetched {len(members)} members from Novi.")

    results = {"total": len(members), "subscribed": 0, "unsubscribed": 0, "error": 0, "skipped": 0}

    for member in members:
        # Field names confirmed PascalCase from Novi API (verified via IDAA Jitsi integration).
        # MembershipStatus field name still needs confirmation against the bulk member endpoint.
        email  = (member.get('Email') or '').strip().replace(' ', '+')
        fname  = member.get('FirstName') or ''
        lname  = member.get('LastName')  or ''
        status = member.get('MembershipStatus') or member.get('Status') or ''

        if not email:
            results['skipped'] += 1
            continue

        display_name = f"{fname} {lname}".strip()
        is_active    = (status == active_status)

        outcome = sync_single_member(email, display_name, list_id, is_active)
        results[outcome] = results.get(outcome, 0) + 1

    log.info(f"Novi → Mailman sync complete: {results}")
    return results


@logger_reset
def handle_novi_webhook(payload: Dict) -> Optional[Dict]:
    """
    Process a Novi membership webhook event and update the appropriate Mailman list.

    Expected payload shape (Novi webhook format — confirm against Novi docs):
        {
            "EventType": "MembershipActivated" | "MembershipLapsed" | "MembershipExpired" | ...,
            "Member": {
                "Email": "...",
                "FirstName": "...",
                "LastName": "...",
                "MembershipStatus": "Active" | "Lapsed" | ...
            }
        }

    TODO: Confirm Novi webhook payload format and EventType values.
    TODO: Pull target list_id from data_store config or per-account settings.
    """
    event_type = payload.get('EventType', '')
    member     = payload.get('Member', {})
    email      = (member.get('Email') or '').strip().replace(' ', '+')
    fname      = member.get('FirstName', '')
    lname      = member.get('LastName', '')
    status     = member.get('MembershipStatus') or member.get('Status', '')

    if not email:
        log.warning(f"Novi webhook received with no email — skipping. Payload: {payload}")
        return None

    # Load target list_id from config
    # TODO: Support per-account list routing (e.g. multiple orgs, each with their own list)
    novi_config = _load_novi_config()
    if not novi_config:
        return None
    list_id = novi_config.get('mailman_list_id', '')
    if not list_id:
        log.error("'mailman_list_id' not set in novi_api_config — cannot route webhook.")
        return None

    ACTIVE_EVENTS = {'MembershipActivated', 'MembershipRenewed', 'MembershipCreated'}
    INACTIVE_EVENTS = {'MembershipLapsed', 'MembershipExpired', 'MembershipTerminated', 'MembershipCancelled'}

    if event_type in ACTIVE_EVENTS:
        is_active = True
    elif event_type in INACTIVE_EVENTS:
        is_active = False
    else:
        log.info(f"Novi webhook: unhandled EventType '{event_type}' for {email} — ignoring.")
        return {"action": "ignored", "reason": f"Unhandled EventType: {event_type}"}

    display_name = f"{fname} {lname}".strip()
    outcome = sync_single_member(email, display_name, list_id, is_active)
    log.info(f"Novi webhook processed: {email} → {outcome} (EventType: {event_type})")
    return {"action": outcome, "email": email, "event_type": event_type}