"""GE-Enforce plugin API.

Two audiences:
- Admin (JWT + geenforce.manage): browse scopes and preview the draft manifest.
  Full CRUD + publish lands in P2; this is the P1/first-slice read surface.
- Client (service token, geenforce.fetch scope): GET /manifest serves the
  CURRENT PUBLISHED snapshot for a scope, never the live draft. Auth mirrors the
  collector's managed-token pattern (X-API-Key or Bearer PAT), plus an optional
  GEENFORCE_API_KEY env bootstrap.
"""

from functools import wraps

from flask import Blueprint, request, Response
from flask_jwt_extended import jwt_required
from sqlalchemy.exc import IntegrityError

from shopdb.api import (
    db, success_response, error_response, ErrorCodes, require_permission,
    service_token_authorized, Setting,
)

SHAREROOT_SETTING = 'geenforce_share_root'

from ..models import (
    ManifestScope, ManifestEntry, ManifestPublishedVersion,
    ManifestEnforcementReport, ENTRY_TYPES, PHASES,
)
from ..serializer import scope_to_manifest, entry_to_dict
from ..importer import build_entry, populate_entry
from ..filters import (
    entry_applies, matches_pctype, matches_hostname, matches_machinenumber,
    matches_cmmversion,
)
from .. import service

geenforce_bp = Blueprint('geenforce', __name__)

FETCH_SCOPE = 'geenforce.fetch'
REPORT_SCOPE = 'geenforce.report'


def _require_service_token(scope):
    """Decorator factory: require a managed service token scoped for `scope`.

    Tokens are the only client auth path (the client kit provisions a
    geenforce.fetch/report token). No env-key fallback: it was never wired into
    config and an unscoped shared key is a needless backdoor.
    """
    def wrapper(f):
        @wraps(f)
        def decorated(*args, **kwargs):
            if service_token_authorized(scope):
                return f(*args, **kwargs)
            return error_response(ErrorCodes.UNAUTHORIZED, 'Invalid API key',
                                  http_code=401)
        return decorated
    return wrapper


require_fetch_token = _require_service_token(FETCH_SCOPE)
require_report_token = _require_service_token(REPORT_SCOPE)


# -- client-facing endpoint ---------------------------------------------------

@geenforce_bp.route('/manifest', methods=['GET'])
@require_fetch_token
def get_manifest():
    """Serve the current published manifest for a scope (fat-client: full scope).

    Query: pctype (=scopename, required), phase (default runtime). The engine
    filters client-side, matching today, so subtype/hostname/machinenumber/
    cmmversion are accepted but not applied here.
    """
    scopename = (request.args.get('pctype') or '').strip()
    phase = (request.args.get('phase') or 'runtime').strip()
    if not scopename:
        return error_response(ErrorCodes.VALIDATION_ERROR,
                              'pctype is required', http_code=400)

    scope = ManifestScope.query.filter_by(
        scopename=scopename, phase=phase).first()
    if not scope:
        return error_response(ErrorCodes.NOT_FOUND,
                              f'No scope: {scopename}', http_code=404)

    published = scope.publishedversions.filter_by(iscurrent=True).first()
    if not published:
        return error_response(ErrorCodes.NOT_FOUND,
                              f'{scopename} has no published version',
                              http_code=404)

    etag = f'"{scope.scopeid}-v{published.versionnumber}"'
    if request.headers.get('If-None-Match') == etag:
        return Response(status=304, headers={'ETag': etag})
    return Response(published.manifestjson, mimetype='application/json',
                    headers={'ETag': etag,
                             'X-Manifest-Version': str(published.versionnumber)})


# -- client reporting (observed state) ----------------------------------------

@geenforce_bp.route('/report', methods=['POST'])
@require_report_token
def post_report():
    """Record one PC's enforcement cycle: applied version (did it receive the
    update?) + per-entry self-heal outcomes (installed/skipped/failed)."""
    payload = request.get_json(silent=True) or {}
    if not (payload.get('hostname') or '').strip():
        return error_response(ErrorCodes.VALIDATION_ERROR,
                              'hostname is required', http_code=400)
    try:
        report = service.record_enforcement_report(payload)
        db.session.commit()
    except ValueError as exc:
        db.session.rollback()
        return error_response(ErrorCodes.VALIDATION_ERROR, str(exc),
                              http_code=400)
    return success_response({'reportid': report.reportid,
                             'status': report.status}, message='recorded')


# -- admin read surface (P2 adds full CRUD + publish) -------------------------

@geenforce_bp.route('/scopes', methods=['GET'])
@jwt_required()
@require_permission('geenforce.manage')
def list_scopes():
    """List imaging PC-type scopes with entry + published-version counts."""
    scopes = ManifestScope.query.order_by(
        ManifestScope.phase, ManifestScope.scopename).all()
    data = []
    for scope in scopes:
        current = scope.publishedversions.filter_by(iscurrent=True).first()
        data.append({
            'scopeid': scope.scopeid,
            'scopename': scope.scopename,
            'phase': scope.phase,
            'manifestversion': scope.manifestversion,
            'computertypeid': scope.computertypeid,
            'measuringtooltypeid': scope.measuringtooltypeid,
            'iscommon': scope.iscommon,
            'entrycount': len(scope.entries),
            'publishedversion': current.versionnumber if current else None,
        })
    return success_response(data)


@geenforce_bp.route('/scopes/<int:scopeid>/preview', methods=['GET'])
@jwt_required()
@require_permission('geenforce.manage')
def preview_scope(scopeid):
    """Render the DRAFT manifest JSON a publish would freeze (review before ship)."""
    scope = db.session.get(ManifestScope, scopeid)
    if not scope:
        return error_response(ErrorCodes.NOT_FOUND, 'No such scope',
                              http_code=404)
    return success_response({'scopename': scope.scopename,
                             'manifest': scope_to_manifest(scope)})


# -- scope CRUD (geenforce.manage) --------------------------------------------

def _scope_summary(scope):
    current = scope.publishedversions.filter_by(iscurrent=True).first()
    return {
        'scopeid': scope.scopeid,
        'scopename': scope.scopename,
        'phase': scope.phase,
        'manifestversion': scope.manifestversion,
        'description': scope.description,
        'computertypeid': scope.computertypeid,
        'measuringtooltypeid': scope.measuringtooltypeid,
        'iscommon': scope.iscommon,
        'entrycount': len(scope.entries),
        'publishedversion': current.versionnumber if current else None,
    }


def _entry_payload(entry):
    """Manifest-entry dict with entryid + sortorder for the editor."""
    data = {'entryid': entry.entryid, 'sortorder': entry.sortorder}
    data.update(entry_to_dict(entry))
    return data


@geenforce_bp.route('/scopes', methods=['POST'])
@jwt_required()
@require_permission('geenforce.manage')
def create_scope():
    payload = request.get_json(silent=True) or {}
    scopename = (payload.get('scopename') or '').strip()
    phase = (payload.get('phase') or 'runtime').strip()
    if not scopename:
        return error_response(ErrorCodes.VALIDATION_ERROR,
                              'scopename is required', http_code=400)
    if phase not in PHASES:
        return error_response(ErrorCodes.VALIDATION_ERROR,
                              f'phase must be one of {PHASES}', http_code=400)
    if ManifestScope.query.filter_by(scopename=scopename, phase=phase).first():
        return error_response(ErrorCodes.VALIDATION_ERROR,
                              'scope already exists', http_code=400)
    scope = ManifestScope(
        scopename=scopename, phase=phase,
        manifestversion=str(payload.get('manifestversion', '1.0')),
        description=payload.get('description'),
        computertypeid=payload.get('computertypeid'),
        measuringtooltypeid=payload.get('measuringtooltypeid'),
        iscommon=bool(payload.get('iscommon', scopename == 'common')))
    db.session.add(scope)
    db.session.commit()
    return success_response(_scope_summary(scope), http_code=201)


@geenforce_bp.route('/scopes/<int:scopeid>', methods=['GET'])
@jwt_required()
@require_permission('geenforce.manage')
def get_scope(scopeid):
    scope = db.session.get(ManifestScope, scopeid)
    if not scope:
        return error_response(ErrorCodes.NOT_FOUND, 'No such scope', http_code=404)
    data = _scope_summary(scope)
    data['entries'] = [_entry_payload(e) for e in scope.entries]
    return success_response(data)


@geenforce_bp.route('/scopes/<int:scopeid>', methods=['PUT'])
@jwt_required()
@require_permission('geenforce.manage')
def update_scope(scopeid):
    scope = db.session.get(ManifestScope, scopeid)
    if not scope:
        return error_response(ErrorCodes.NOT_FOUND, 'No such scope', http_code=404)
    payload = request.get_json(silent=True) or {}
    for field in ('description', 'computertypeid', 'measuringtooltypeid'):
        if field in payload:
            setattr(scope, field, payload[field])
    if 'manifestversion' in payload:
        scope.manifestversion = str(payload['manifestversion'])
    if 'iscommon' in payload:
        scope.iscommon = bool(payload['iscommon'])
    db.session.commit()
    return success_response(_scope_summary(scope))


@geenforce_bp.route('/scopes/<int:scopeid>', methods=['DELETE'])
@jwt_required()
@require_permission('geenforce.manage')
def delete_scope(scopeid):
    scope = db.session.get(ManifestScope, scopeid)
    if not scope:
        return error_response(ErrorCodes.NOT_FOUND, 'No such scope', http_code=404)
    db.session.delete(scope)
    db.session.commit()
    return success_response({'deleted': scopeid})


# -- entry CRUD (geenforce.manage) --------------------------------------------

def _validate_entry(payload):
    """Return an error string, or None if the entry payload is valid."""
    if not (payload.get('Name') or '').strip():
        return 'entry Name is required'
    if payload.get('Type') not in ENTRY_TYPES:
        return f'entry Type must be one of {ENTRY_TYPES}'
    return None


@geenforce_bp.route('/scopes/<int:scopeid>/entries', methods=['POST'])
@jwt_required()
@require_permission('geenforce.manage')
def create_entry(scopeid):
    scope = db.session.get(ManifestScope, scopeid)
    if not scope:
        return error_response(ErrorCodes.NOT_FOUND, 'No such scope', http_code=404)
    payload = request.get_json(silent=True) or {}
    invalid = _validate_entry(payload)
    if invalid:
        return error_response(ErrorCodes.VALIDATION_ERROR, invalid, http_code=400)
    nextorder = max([e.sortorder for e in scope.entries], default=-1) + 1
    entry = build_entry(payload, nextorder)
    scope.entries.append(entry)
    try:
        db.session.commit()
    except IntegrityError:
        db.session.rollback()
        return error_response(ErrorCodes.VALIDATION_ERROR,
                              'an entry with that Name already exists in this scope',
                              http_code=400)
    return success_response(_entry_payload(entry), http_code=201)


@geenforce_bp.route('/entries/<int:entryid>', methods=['PUT'])
@jwt_required()
@require_permission('geenforce.manage')
def update_entry(entryid):
    entry = db.session.get(ManifestEntry, entryid)
    if not entry:
        return error_response(ErrorCodes.NOT_FOUND, 'No such entry', http_code=404)
    payload = request.get_json(silent=True) or {}
    invalid = _validate_entry(payload)
    if invalid:
        return error_response(ErrorCodes.VALIDATION_ERROR, invalid, http_code=400)
    # Free the one-to-one InUseCheck (unique entryid) before populate re-inserts
    # it, so the replacement does not collide with the old row mid-flush.
    if entry.inusecheck is not None:
        db.session.delete(entry.inusecheck)
        entry.inusecheck = None
        db.session.flush()
    populate_entry(entry, payload)
    try:
        db.session.commit()
    except IntegrityError:
        db.session.rollback()
        return error_response(ErrorCodes.VALIDATION_ERROR,
                              'an entry with that Name already exists in this scope',
                              http_code=400)
    return success_response(_entry_payload(entry))


@geenforce_bp.route('/entries/<int:entryid>', methods=['DELETE'])
@jwt_required()
@require_permission('geenforce.manage')
def delete_entry(entryid):
    entry = db.session.get(ManifestEntry, entryid)
    if not entry:
        return error_response(ErrorCodes.NOT_FOUND, 'No such entry', http_code=404)
    db.session.delete(entry)
    db.session.commit()
    return success_response({'deleted': entryid})


@geenforce_bp.route('/scopes/<int:scopeid>/entries/reorder', methods=['PUT'])
@jwt_required()
@require_permission('geenforce.manage')
def reorder_entries(scopeid):
    """Set entry order from a list of entryids (the ordering contract)."""
    scope = db.session.get(ManifestScope, scopeid)
    if not scope:
        return error_response(ErrorCodes.NOT_FOUND, 'No such scope', http_code=404)
    order = (request.get_json(silent=True) or {}).get('order') or []
    owned = {e.entryid: e for e in scope.entries}
    if set(order) != set(owned):
        return error_response(ErrorCodes.VALIDATION_ERROR,
                              'order must list exactly this scope\'s entry ids',
                              http_code=400)
    for position, entryid in enumerate(order):
        owned[entryid].sortorder = position
    db.session.commit()
    return success_response({'order': order})


# -- simulate: "what would this PC get" ---------------------------------------

@geenforce_bp.route('/scopes/<int:scopeid>/simulate', methods=['GET'])
@jwt_required()
@require_permission('geenforce.manage')
def simulate_scope(scopeid):
    """Which draft entries apply to a given machine profile, and why the rest
    are filtered out (reuses the engine-mirror filters)."""
    scope = db.session.get(ManifestScope, scopeid)
    if not scope:
        return error_response(ErrorCodes.NOT_FOUND, 'No such scope', http_code=404)
    profile = {
        'pctype': request.args.get('pctype') or scope.scopename,
        'subtype': request.args.get('subtype'),
        'hostname': request.args.get('hostname'),
        'machinenumber': request.args.get('machinenumber'),
        'cmmversion': request.args.get('cmmversion'),
        'phase': scope.phase,
    }
    applied, filtered = [], []
    for entry in scope.entries:
        entry_dict = entry_to_dict(entry)
        if entry_applies(entry_dict, profile):
            applied.append(entry.name)
        else:
            reasons = []
            strict_allowed = profile.get('phase') == 'preinstall'
            if not matches_pctype(entry_dict, profile['pctype'],
                                  profile['subtype'], strict_allowed):
                reasons.append('PCTypes')
            if not matches_hostname(entry_dict, profile['hostname']):
                reasons.append('TargetHostnames')
            if not matches_machinenumber(entry_dict, profile['machinenumber']):
                reasons.append('TargetMachineNumbers')
            if not matches_cmmversion(entry_dict, profile['cmmversion']):
                reasons.append('_CmmVersion')
            filtered.append({'name': entry.name, 'filteredby': reasons})
    return success_response({'profile': profile, 'applied': applied,
                             'filtered': filtered})


# -- publish lifecycle (geenforce.publish) ------------------------------------

@geenforce_bp.route('/scopes/<int:scopeid>/publish', methods=['POST'])
@jwt_required()
@require_permission('geenforce.publish')
def publish_scope_route(scopeid):
    scope = db.session.get(ManifestScope, scopeid)
    if not scope:
        return error_response(ErrorCodes.NOT_FOUND, 'No such scope', http_code=404)
    from flask_jwt_extended import get_jwt_identity
    notes = (request.get_json(silent=True) or {}).get('notes')
    try:
        publishedby = int(get_jwt_identity())
    except (TypeError, ValueError):
        publishedby = None
    version = service.publish_scope(scope.scopename, scope.phase,
                                    notes=notes, publishedby=publishedby)
    db.session.commit()
    return success_response({'versionnumber': version}, http_code=201)


@geenforce_bp.route('/scopes/<int:scopeid>/versions', methods=['GET'])
@jwt_required()
@require_permission('geenforce.manage')
def list_versions(scopeid):
    scope = db.session.get(ManifestScope, scopeid)
    if not scope:
        return error_response(ErrorCodes.NOT_FOUND, 'No such scope', http_code=404)
    versions = ManifestPublishedVersion.query.filter_by(
        scopeid=scopeid).order_by(
        ManifestPublishedVersion.versionnumber.desc()).all()
    return success_response([{
        'versionnumber': v.versionnumber,
        'iscurrent': v.iscurrent,
        'publishedat': v.publishedat.isoformat() + 'Z' if v.publishedat else None,
        'publishedby': v.publishedby,
        'notes': v.notes,
    } for v in versions])


@geenforce_bp.route('/scopes/<int:scopeid>/versions/<int:versionnumber>',
                    methods=['GET'])
@jwt_required()
@require_permission('geenforce.manage')
def get_version(scopeid, versionnumber):
    version = ManifestPublishedVersion.query.filter_by(
        scopeid=scopeid, versionnumber=versionnumber).first()
    if not version:
        return error_response(ErrorCodes.NOT_FOUND, 'No such version',
                              http_code=404)
    import json as _json
    return success_response({'versionnumber': version.versionnumber,
                             'manifest': _json.loads(version.manifestjson)})


@geenforce_bp.route('/config', methods=['GET'])
@jwt_required()
@require_permission('geenforce.manage')
def get_config():
    """Plugin config: the on-share export root (for export-to-share)."""
    setting = Setting.query.filter_by(key=SHAREROOT_SETTING).first()
    return success_response({'shareroot': setting.value if setting else ''})


@geenforce_bp.route('/config', methods=['PUT'])
@jwt_required()
@require_permission('geenforce.publish')
def put_config():
    payload = request.get_json(silent=True) or {}
    Setting.set(SHAREROOT_SETTING, (payload.get('shareroot') or '').strip(),
                valuetype='string', category='geenforce',
                description='On-share export root for GE-Enforce manifests')
    db.session.commit()
    return success_response({'shareroot': (payload.get('shareroot') or '').strip()})


@geenforce_bp.route('/scopes/<int:scopeid>/export-share', methods=['POST'])
@jwt_required()
@require_permission('geenforce.publish')
def export_share_route(scopeid):
    """Write the scope's current published JSON to the configured share root
    (backing up the old file to _meta/history first)."""
    scope = db.session.get(ManifestScope, scopeid)
    if not scope:
        return error_response(ErrorCodes.NOT_FOUND, 'No such scope', http_code=404)
    setting = Setting.query.filter_by(key=SHAREROOT_SETTING).first()
    shareroot = setting.value if setting else ''
    if not shareroot:
        return error_response(ErrorCodes.VALIDATION_ERROR,
                              'Configure the share root first', http_code=400)
    try:
        path = service.export_scope_to_share(scope.scopename, scope.phase,
                                             shareroot)
    except (ValueError, OSError) as exc:
        return error_response(ErrorCodes.VALIDATION_ERROR, str(exc), http_code=400)
    return success_response({'path': path})


@geenforce_bp.route('/scopes/<int:scopeid>/rollback', methods=['POST'])
@jwt_required()
@require_permission('geenforce.publish')
def rollback_scope_route(scopeid):
    scope = db.session.get(ManifestScope, scopeid)
    if not scope:
        return error_response(ErrorCodes.NOT_FOUND, 'No such scope', http_code=404)
    versionnumber = (request.get_json(silent=True) or {}).get('versionnumber')
    if versionnumber is None:
        return error_response(ErrorCodes.VALIDATION_ERROR,
                              'versionnumber is required', http_code=400)
    try:
        service.rollback_scope(scope.scopename, scope.phase, int(versionnumber))
        db.session.commit()
    except ValueError as exc:
        db.session.rollback()
        return error_response(ErrorCodes.VALIDATION_ERROR, str(exc), http_code=400)
    return success_response({'versionnumber': int(versionnumber)})


def _current_published_version(scopename, phase):
    scope = ManifestScope.query.filter_by(
        scopename=scopename, phase=phase).first()
    if not scope:
        return None
    published = scope.publishedversions.filter_by(iscurrent=True).first()
    return published.versionnumber if published else None


@geenforce_bp.route('/reports', methods=['GET'])
@jwt_required()
@require_permission('geenforce.manage')
def list_reports():
    """Latest enforcement report per PC (fleet compliance view).

    Each row shows the applied vs latest published version (receivedlatest = the
    PC picked up the update) and the install/skip/fail counts + status.
    Optional filters: hostname, scopename.
    """
    query = ManifestEnforcementReport.query.filter_by(iscurrent=True)
    hostname = request.args.get('hostname')
    scopename = request.args.get('scopename')
    if hostname:
        query = query.filter(ManifestEnforcementReport.hostname.ilike(hostname))
    if scopename:
        query = query.filter_by(scopename=scopename)
    reports = query.order_by(
        ManifestEnforcementReport.receivedat.desc()).all()

    latest_cache = {}
    data = []
    for report in reports:
        key = (report.scopename, report.phase)
        if key not in latest_cache:
            latest_cache[key] = _current_published_version(*key)
        latest = latest_cache[key]
        data.append({
            'reportid': report.reportid,
            'hostname': report.hostname,
            'scopename': report.scopename,
            'phase': report.phase,
            'appliedversion': report.appliedversion,
            'latestversion': latest,
            'receivedlatest': (latest is not None
                               and report.appliedversion == latest),
            'enforcerversion': report.enforcerversion,
            'status': report.status,
            'installed': report.installedcount,
            'skipped': report.skippedcount,
            'failed': report.failedcount,
            'filtered': report.filteredcount,
            'lastcheckin': (report.lastcheckin.isoformat() + 'Z'
                            if report.lastcheckin else None),
            'receivedat': (report.receivedat.isoformat() + 'Z'
                           if report.receivedat else None),
        })
    return success_response(data)


@geenforce_bp.route('/reports/<int:reportid>', methods=['GET'])
@jwt_required()
@require_permission('geenforce.manage')
def get_report(reportid):
    """One report with per-entry outcomes (self-heal / failure detail)."""
    report = db.session.get(ManifestEnforcementReport, reportid)
    if not report:
        return error_response(ErrorCodes.NOT_FOUND, 'No such report',
                              http_code=404)
    latest = _current_published_version(report.scopename, report.phase)
    return success_response({
        'reportid': report.reportid,
        'hostname': report.hostname,
        'scopename': report.scopename,
        'phase': report.phase,
        'appliedversion': report.appliedversion,
        'latestversion': latest,
        'receivedlatest': (latest is not None
                           and report.appliedversion == latest),
        'status': report.status,
        'results': [{
            'entryname': r.entryname,
            'action': r.action,
            'selfhealed': r.selfhealed,
            'exitcode': r.exitcode,
            'message': r.message,
        } for r in report.results],
    })