"""Machines plugin API endpoints."""

from flask import Blueprint, request
from flask_jwt_extended import jwt_required

from shopdb.api import db, Asset, AssetType, AuditLog, Vendor, success_response, error_response, paginated_response, ErrorCodes, get_pagination_params, paginate_query, resolve_dualpath_pairs, dualpath_single_machine_enabled

from ..models import Machine, MachineType

from shopdb.api import require_permission, apply_import_timestamps

machines_bp = Blueprint('machines', __name__)


# =============================================================================
# Machine Types
# =============================================================================

@machines_bp.route('/types', methods=['GET'])
@jwt_required(optional=True)
def list_machine_types():
    """List all machine types."""
    page, per_page = get_pagination_params(request)

    query = MachineType.query

    if request.args.get('active', 'true').lower() != 'false':
        query = query.filter(MachineType.isactive == True)

    if search := request.args.get('search'):
        query = query.filter(MachineType.machinetype.ilike(f'%{search}%'))

    query = query.order_by(MachineType.machinetype)

    items, total = paginate_query(query, page, per_page)
    data = [t.to_dict() for t in items]

    return paginated_response(data, page, per_page, total)


@machines_bp.route('/types/<int:type_id>', methods=['GET'])
@jwt_required(optional=True)
def get_machine_type(type_id: int):
    """Get a single machine type."""
    t = db.session.get(MachineType, type_id)

    if not t:
        return error_response(
            ErrorCodes.NOT_FOUND,
            f'Machine type with ID {type_id} not found',
            http_code=404
        )

    return success_response(t.to_dict())


@machines_bp.route('/types', methods=['POST'])
@jwt_required()
@require_permission('machines.create')
def create_machine_type():
    """Create a new machine type."""
    data = request.get_json()

    if not data or not data.get('machinetype'):
        return error_response(ErrorCodes.VALIDATION_ERROR, 'machinetype is required')

    existing = MachineType.query.filter_by(machinetype=data['machinetype']).first()
    if existing:
        if not existing.isactive:
            existing.isactive = True
            for key in ('description', 'icon', 'color'):
                if data.get(key) is not None:
                    setattr(existing, key, data[key])
            db.session.commit()
            return success_response(existing.to_dict(), message='Reactivated existing type')
        return error_response(
            ErrorCodes.CONFLICT,
            f"Machine type '{data['machinetype']}' already exists",
            http_code=409
        )

    t = MachineType(
        machinetype=data['machinetype'],
        description=data.get('description'),
        icon=data.get('icon'), color=data.get('color')
    )

    db.session.add(t)
    db.session.commit()

    return success_response(t.to_dict(), message='Machine type created', http_code=201)


@machines_bp.route('/types/<int:type_id>', methods=['PUT'])
@jwt_required()
@require_permission('machines.edit')
def update_machine_type(type_id: int):
    """Update a machine type."""
    t = db.session.get(MachineType, type_id)

    if not t:
        return error_response(
            ErrorCodes.NOT_FOUND,
            f'Machine type with ID {type_id} not found',
            http_code=404
        )

    data = request.get_json()
    if not data:
        return error_response(ErrorCodes.VALIDATION_ERROR, 'No data provided')

    if 'machinetype' in data and data['machinetype'] != t.machinetype:
        if MachineType.query.filter_by(machinetype=data['machinetype']).first():
            return error_response(
                ErrorCodes.CONFLICT,
                f"Machine type '{data['machinetype']}' already exists",
                http_code=409
            )

    for key in ['machinetype', 'description', 'icon', 'color', 'isactive']:
        if key in data:
            setattr(t, key, data[key])

    db.session.commit()
    return success_response(t.to_dict(), message='Machine type updated')


@machines_bp.route('/types/<int:type_id>', methods=['DELETE'])
@jwt_required()
@require_permission('machines.delete')
def delete_machine_type(type_id: int):
    """Delete a machine type. Refused if any asset still uses it."""
    t = db.session.get(MachineType, type_id)
    if not t:
        return error_response(ErrorCodes.NOT_FOUND, 'Machine type not found', http_code=404)
    inuse = Machine.query.filter_by(machinetypeid=type_id).count()
    if inuse:
        return error_response(ErrorCodes.CONFLICT,
                              f"Cannot delete: {inuse} asset(s) still use this type", http_code=409)
    db.session.delete(t)
    db.session.commit()
    return success_response(message='Machine type deleted')


# =============================================================================
# Machine CRUD
# =============================================================================

@machines_bp.route('', methods=['GET'])
@jwt_required(optional=True)
def list_machines():
    """
    List all machines with filtering and pagination.

    Query parameters:
    - page, per_page: Pagination
    - active: Filter by active status
    - search: Search by asset number or name
    - type_id: Filter by machine type ID
    - vendor_id: Filter by vendor ID
    - location_id: Filter by location ID
    - businessunit_id: Filter by business unit ID
    """
    page, per_page = get_pagination_params(request)

    # Join Machine with Asset
    query = db.session.query(Machine).join(Asset)

    # Active filter
    if request.args.get('active', 'true').lower() != 'false':
        query = query.filter(Asset.isactive == True)

    # Exact-match natural-key lookup for idempotent import (asset number).
    if exactassetnumber := request.args.get('assetnumber'):
        query = query.filter(Asset.assetnumber == exactassetnumber)

    # Search filter. Covers what the list actually SHOWS - the asset fields plus
    # the type and vendor names, which are columns in the table. Searching a type
    # like 'Part Washer' used to return nothing. Outer joins so a machine with no
    # type or vendor still matches on its own fields.
    if search := request.args.get('search'):
        pattern = f'%{search}%'
        query = query.outerjoin(
            MachineType, Machine.machinetypeid == MachineType.machinetypeid
        ).outerjoin(
            Vendor, Machine.vendorid == Vendor.vendorid
        ).filter(
            db.or_(
                Asset.assetnumber.ilike(pattern),
                Asset.name.ilike(pattern),
                Asset.serialnumber.ilike(pattern),
                MachineType.machinetype.ilike(pattern),
                Vendor.vendor.ilike(pattern)
            )
        )

    # Machine type filter
    if type_id := request.args.get('typeid', request.args.get('type_id')):
        query = query.filter(Machine.machinetypeid == int(type_id))

    # Vendor filter
    if vendor_id := request.args.get('vendorid', request.args.get('vendor_id')):
        query = query.filter(Machine.vendorid == int(vendor_id))

    # Location filter
    if location_id := request.args.get('locationid', request.args.get('location_id')):
        query = query.filter(Asset.locationid == int(location_id))

    # Business unit filter
    if bu_id := request.args.get('businessunitid', request.args.get('businessunit_id')):
        query = query.filter(Asset.businessunitid == int(bu_id))

    # Sorting
    sort_by = request.args.get('sort', 'assetnumber')
    sort_dir = request.args.get('dir', 'asc')

    if sort_by == 'assetnumber':
        col = Asset.assetnumber
    elif sort_by == 'name':
        col = Asset.name
    else:
        col = Asset.assetnumber

    query = query.order_by(col.desc() if sort_dir == 'desc' else col)

    # Dualpath single-machine collapse: hide the secondary bay so a dual-bay
    # pair lists (and paginates) as one machine. Excluding before pagination
    # keeps totals honest. Gated on the site setting (default on).
    collapse = None
    if dualpath_single_machine_enabled():
        collapse = resolve_dualpath_pairs()
        if collapse.secondaryassetids:
            query = query.filter(Asset.assetid.notin_(collapse.secondaryassetids))

    items, total = paginate_query(query, page, per_page)

    # Resolve partner machineids for this page's primaries in one query.
    machineidbyasset = {}
    if collapse:
        partnerassetids = [
            collapse.partnerbyasset[m.assetid]['assetid']
            for m in items if m.assetid in collapse.partnerbyasset
        ]
        if partnerassetids:
            for partner in Machine.query.filter(
                    Machine.assetid.in_(partnerassetids)).all():
                machineidbyasset[partner.assetid] = partner.machineid

    # Build response with both asset and machine data
    data = []
    for mach in items:
        item = mach.asset.to_dict() if mach.asset else {}
        item['machine'] = mach.to_dict()
        # annotate the visible bay with its hidden partner (for '2007 / 2008')
        partner = collapse.partnerbyasset.get(mach.assetid) if collapse else None
        item['dualpathpartner'] = {
            'assetid': partner['assetid'],
            'machineid': machineidbyasset.get(partner['assetid']),
            'assetnumber': partner['assetnumber'],
        } if partner else None
        data.append(item)

    return paginated_response(data, page, per_page, total)


def _dualpath_partner_for(assetid):
    """Resolve this machine's Dualpath sibling, or None. Always evaluated
    (independent of the collapse toggle) so the detail-page banner shows even
    when a site lists both bays. Returns {assetid, machineid, assetnumber}."""
    partner = resolve_dualpath_pairs().partnerbyasset.get(assetid)
    if not partner:
        return None
    partnermach = Machine.query.filter_by(assetid=partner['assetid']).first()
    return {
        'assetid': partner['assetid'],
        'machineid': partnermach.machineid if partnermach else None,
        'assetnumber': partner['assetnumber'],
    }


@machines_bp.route('/<int:machine_id>', methods=['GET'])
@jwt_required(optional=True)
def get_machine(machine_id: int):
    """Get a single machine item with full details."""
    mach = db.session.get(Machine, machine_id)

    if not mach:
        return error_response(
            ErrorCodes.NOT_FOUND,
            f'Machine with ID {machine_id} not found',
            http_code=404
        )

    result = mach.asset.to_dict() if mach.asset else {}
    result['machine'] = mach.to_dict()
    result['dualpathpartner'] = _dualpath_partner_for(mach.assetid)

    return success_response(result)


@machines_bp.route('/by-asset/<int:asset_id>', methods=['GET'])
@jwt_required(optional=True)
def get_machine_by_asset(asset_id: int):
    """Get machine data by asset ID."""
    mach = Machine.query.filter_by(assetid=asset_id).first()

    if not mach:
        return error_response(
            ErrorCodes.NOT_FOUND,
            f'Machine for asset {asset_id} not found',
            http_code=404
        )

    result = mach.asset.to_dict() if mach.asset else {}
    result['machine'] = mach.to_dict()
    result['dualpathpartner'] = _dualpath_partner_for(mach.assetid)

    return success_response(result)


@machines_bp.route('', methods=['POST'])
@jwt_required()
@require_permission('machines.create')
def create_machine():
    """
    Create new machine (creates both Asset and Machine records).

    Required fields:
    - assetnumber: Business identifier

    Optional fields:
    - name, serialnumber, statusid, locationid, businessunitid
    - machinetypeid, vendorid, modelnumberid
    - requiresmanualconfig, islocationonly
    - mapx, mapy, notes
    """
    data = request.get_json()

    if not data:
        return error_response(ErrorCodes.VALIDATION_ERROR, 'No data provided')

    if not data.get('assetnumber'):
        return error_response(ErrorCodes.VALIDATION_ERROR, 'assetnumber is required')

    # Check for duplicate assetnumber
    if Asset.query.filter_by(assetnumber=data['assetnumber']).first():
        return error_response(
            ErrorCodes.CONFLICT,
            f"Asset with number '{data['assetnumber']}' already exists",
            http_code=409
        )

    # Get machine asset type
    machine_type = AssetType.query.filter_by(assettype='machine').first()
    if not machine_type:
        return error_response(
            ErrorCodes.INTERNAL_ERROR,
            'Machine asset type not found. Plugin may not be properly installed.',
            http_code=500
        )

    # Create the core asset
    asset = Asset(
        assetnumber=data['assetnumber'],
        name=data.get('name'),
        gaugelabreference=data.get('gaugelabreference'),
        maintenancereference=data.get('maintenancereference'),
        serialnumber=data.get('serialnumber'),
        assettypeid=machine_type.assettypeid,
        statusid=data.get('statusid', 1),
        locationid=data.get('locationid'),
        businessunitid=data.get('businessunitid'),
        mapx=data.get('mapx'),
        mapy=data.get('mapy'),
        notes=data.get('notes')
    )

    db.session.add(asset)
    db.session.flush()  # Get the assetid

    # Create the machine extension
    mach = Machine(
        assetid=asset.assetid,
        machinetypeid=data.get('machinetypeid'),
        vendorid=data.get('vendorid'),
        modelnumberid=data.get('modelnumberid'),
        requiresmanualconfig=data.get('requiresmanualconfig', False),
        islocationonly=data.get('islocationonly', False),
        lastmaintenancedate=data.get('lastmaintenancedate'),
        nextmaintenancedate=data.get('nextmaintenancedate'),
        maintenanceintervaldays=data.get('maintenanceintervaldays'),
        controllervendorid=data.get('controllervendorid'),
        controllermodelid=data.get('controllermodelid')
    )

    db.session.add(mach)
    db.session.flush()

    # Preserve legacy timestamps in import mode (no-op otherwise)
    apply_import_timestamps(asset, data)

    # Audit log
    AuditLog.log('created', 'Machine', entityid=mach.machineid,
                 entityname=data['assetnumber'])

    db.session.commit()

    result = asset.to_dict()
    result['machine'] = mach.to_dict()

    return success_response(result, message='Machine created', http_code=201)


@machines_bp.route('/<int:machine_id>', methods=['PUT'])
@jwt_required()
@require_permission('machines.edit')
def update_machine(machine_id: int):
    """Update machine (both Asset and Machine records)."""
    mach = db.session.get(Machine, machine_id)

    if not mach:
        return error_response(
            ErrorCodes.NOT_FOUND,
            f'Machine with ID {machine_id} not found',
            http_code=404
        )

    data = request.get_json()
    if not data:
        return error_response(ErrorCodes.VALIDATION_ERROR, 'No data provided')

    asset = mach.asset

    # Check for conflicting assetnumber
    if 'assetnumber' in data and data['assetnumber'] != asset.assetnumber:
        if Asset.query.filter_by(assetnumber=data['assetnumber']).first():
            return error_response(
                ErrorCodes.CONFLICT,
                f"Asset with number '{data['assetnumber']}' already exists",
                http_code=409
            )

    # Track changes for audit log
    changes = {}

    # Update asset fields
    asset_fields = ['assetnumber', 'name', 'gaugelabreference',
                    'maintenancereference', 'serialnumber', 'statusid',
                    'locationid', 'businessunitid', 'mapx', 'mapy',
                    'notes', 'isactive']
    for key in asset_fields:
        if key in data:
            old_val = getattr(asset, key)
            new_val = data[key]
            if old_val != new_val:
                changes[key] = {'old': old_val, 'new': new_val}
            setattr(asset, key, data[key])

    # Update machine fields
    machine_fields = ['machinetypeid', 'vendorid', 'modelnumberid',
                      'requiresmanualconfig', 'islocationonly',
                      'lastmaintenancedate', 'nextmaintenancedate', 'maintenanceintervaldays',
                      'controllervendorid', 'controllermodelid']
    for key in machine_fields:
        if key in data:
            old_val = getattr(mach, key)
            new_val = data[key]
            if old_val != new_val:
                changes[key] = {'old': old_val, 'new': new_val}
            setattr(mach, key, data[key])

    # Audit log if there were changes
    if changes:
        AuditLog.log('updated', 'Machine', entityid=mach.machineid,
                     entityname=asset.assetnumber, changes=changes)

    apply_import_timestamps(asset, data)
    db.session.commit()

    result = asset.to_dict()
    result['machine'] = mach.to_dict()

    return success_response(result, message='Machine updated')


@machines_bp.route('/<int:machine_id>', methods=['DELETE'])
@jwt_required()
@require_permission('machines.delete')
def delete_machine(machine_id: int):
    """Delete (soft delete) machine."""
    mach = db.session.get(Machine, machine_id)

    if not mach:
        return error_response(
            ErrorCodes.NOT_FOUND,
            f'Machine with ID {machine_id} not found',
            http_code=404
        )

    # Soft delete the asset (machine extension will stay linked)
    mach.asset.isactive = False

    # Audit log
    AuditLog.log('deleted', 'Machine', entityid=mach.machineid,
                 entityname=mach.asset.assetnumber)

    db.session.commit()

    return success_response(message='Machine deleted')


# =============================================================================
# Dashboard
# =============================================================================

@machines_bp.route('/dashboard/summary', methods=['GET'])
@jwt_required(optional=True)
def dashboard_summary():
    """Get machine dashboard summary data."""
    # Dualpath single-machine collapse: hide the secondary bay from counts so a
    # dual-bay pair counts once. Gated on the site setting (default on).
    secondaryassetids = set()
    if dualpath_single_machine_enabled():
        secondaryassetids = resolve_dualpath_pairs().secondaryassetids

    # Total active machine count
    total_query = db.session.query(Machine).join(Asset).filter(
        Asset.isactive == True
    )
    if secondaryassetids:
        total_query = total_query.filter(Asset.assetid.notin_(secondaryassetids))
    total = total_query.count()

    # Count by machine type
    by_type_query = db.session.query(
        MachineType.machinetype,
        db.func.count(Machine.machineid)
    ).join(Machine, Machine.machinetypeid == MachineType.machinetypeid
    ).join(Asset, Asset.assetid == Machine.assetid
    ).filter(Asset.isactive == True)
    if secondaryassetids:
        by_type_query = by_type_query.filter(Asset.assetid.notin_(secondaryassetids))
    by_type = by_type_query.group_by(MachineType.machinetype).all()

    # Count by status
    from shopdb.api import AssetStatus
    by_status = db.session.query(
        AssetStatus.status,
        db.func.count(Machine.machineid)
    ).join(Asset, Asset.assetid == Machine.assetid
    ).join(AssetStatus, AssetStatus.statusid == Asset.statusid
    ).filter(Asset.isactive == True
    ).group_by(AssetStatus.status
    ).all()

    return success_response({
        'total': total,
        'bytype': [{'type': t, 'count': c} for t, c in by_type],
        'bystatus': [{'status': s, 'count': c} for s, c in by_status]
    })