"""Applications API endpoints."""

from flask import Blueprint, request
from flask_jwt_extended import jwt_required

from shopdb.extensions import db
from shopdb.core.models import (
    Application, AppVersion, AppOwner, SupportTeam, InstalledApp, Machine, AuditLog
)
from shopdb.utils.responses import (
    success_response,
    error_response,
    paginated_response,
    ErrorCodes
)
from shopdb.utils.pagination import get_pagination_params, paginate_query

applications_bp = Blueprint('applications', __name__)


@applications_bp.route('', methods=['GET'])
@jwt_required(optional=True)
def list_applications():
    """List all applications."""
    page, per_page = get_pagination_params(request)

    query = Application.query

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

    # Filter out hidden unless specifically requested
    if request.args.get('showhidden', 'false').lower() != 'true':
        query = query.filter(Application.ishidden == False)

    # Filter by installable
    if request.args.get('installable') is not None:
        installable = request.args.get('installable').lower() == 'true'
        query = query.filter(Application.isinstallable == installable)

    if search := request.args.get('search'):
        query = query.filter(
            db.or_(
                Application.appname.ilike(f'%{search}%'),
                Application.appdescription.ilike(f'%{search}%')
            )
        )

    query = query.order_by(Application.appname)

    items, total = paginate_query(query, page, per_page)
    data = []
    for app in items:
        app_dict = app.to_dict()
        if app.supportteam:
            app_dict['supportteam'] = {
                'supportteamid': app.supportteam.supportteamid,
                'teamname': app.supportteam.teamname,
                'teamurl': app.supportteam.teamurl,
                'owner': {
                    'appownerid': app.supportteam.owner.appownerid,
                    'appowner': app.supportteam.owner.appowner,
                    'sso': app.supportteam.owner.sso
                } if app.supportteam.owner else None
            }
        else:
            app_dict['supportteam'] = None
        app_dict['installedcount'] = app.installed_on.filter_by(isactive=True).count()
        data.append(app_dict)

    return paginated_response(data, page, per_page, total)


@applications_bp.route('/<int:app_id>', methods=['GET'])
@jwt_required(optional=True)
def get_application(app_id: int):
    """Get a single application with details."""
    app = Application.query.get(app_id)

    if not app:
        return error_response(ErrorCodes.NOT_FOUND, 'Application not found', http_code=404)

    data = app.to_dict()
    if app.supportteam:
        data['supportteam'] = {
            'supportteamid': app.supportteam.supportteamid,
            'teamname': app.supportteam.teamname,
            'teamurl': app.supportteam.teamurl,
            'owner': {
                'appownerid': app.supportteam.owner.appownerid,
                'appowner': app.supportteam.owner.appowner,
                'sso': app.supportteam.owner.sso
            } if app.supportteam.owner else None
        }
    else:
        data['supportteam'] = None
    data['versions'] = [v.to_dict() for v in app.versions.filter_by(isactive=True).order_by(AppVersion.version.desc()).all()]
    data['installedcount'] = app.installed_on.filter_by(isactive=True).count()

    return success_response(data)


@applications_bp.route('', methods=['POST'])
@jwt_required()
def create_application():
    """Create a new application."""
    data = request.get_json()

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

    if Application.query.filter_by(appname=data['appname']).first():
        return error_response(
            ErrorCodes.CONFLICT,
            f"Application '{data['appname']}' already exists",
            http_code=409
        )

    app = Application(
        appname=data['appname'],
        appdescription=data.get('appdescription'),
        supportteamid=data.get('supportteamid'),
        isinstallable=data.get('isinstallable', False),
        applicationnotes=data.get('applicationnotes'),
        installpath=data.get('installpath'),
        applicationlink=data.get('applicationlink'),
        documentationpath=data.get('documentationpath'),
        ishidden=data.get('ishidden', False),
        isprinter=data.get('isprinter', False),
        islicenced=data.get('islicenced', False),
        image=data.get('image')
    )

    db.session.add(app)
    db.session.flush()

    AuditLog.log('created', 'Application', entityid=app.appid, entityname=app.appname)

    db.session.commit()

    return success_response(app.to_dict(), message='Application created', http_code=201)


@applications_bp.route('/<int:app_id>', methods=['PUT'])
@jwt_required()
def update_application(app_id: int):
    """Update an application."""
    app = Application.query.get(app_id)

    if not app:
        return error_response(ErrorCodes.NOT_FOUND, 'Application not found', http_code=404)

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

    if 'appname' in data and data['appname'] != app.appname:
        if Application.query.filter_by(appname=data['appname']).first():
            return error_response(
                ErrorCodes.CONFLICT,
                f"Application '{data['appname']}' already exists",
                http_code=409
            )

    fields = [
        'appname', 'appdescription', 'supportteamid', 'isinstallable',
        'applicationnotes', 'installpath', 'applicationlink', 'documentationpath',
        'ishidden', 'isprinter', 'islicenced', 'image', 'isactive'
    ]

    changes = {}
    for key in fields:
        if key in data:
            old_val = getattr(app, key)
            new_val = data[key]
            if old_val != new_val:
                changes[key] = {'old': old_val, 'new': new_val}
            setattr(app, key, data[key])

    if changes:
        AuditLog.log('updated', 'Application', entityid=app.appid,
                     entityname=app.appname, changes=changes)

    db.session.commit()
    return success_response(app.to_dict(), message='Application updated')


@applications_bp.route('/<int:app_id>', methods=['DELETE'])
@jwt_required()
def delete_application(app_id: int):
    """Delete (deactivate) an application."""
    app = Application.query.get(app_id)

    if not app:
        return error_response(ErrorCodes.NOT_FOUND, 'Application not found', http_code=404)

    app.isactive = False

    AuditLog.log('deleted', 'Application', entityid=app.appid, entityname=app.appname)

    db.session.commit()

    return success_response(message='Application deleted')


# ---- Versions ----

@applications_bp.route('/<int:app_id>/versions', methods=['GET'])
@jwt_required(optional=True)
def list_versions(app_id: int):
    """List all versions for an application."""
    app = Application.query.get(app_id)
    if not app:
        return error_response(ErrorCodes.NOT_FOUND, 'Application not found', http_code=404)

    versions = app.versions.filter_by(isactive=True).order_by(AppVersion.version.desc()).all()
    return success_response([v.to_dict() for v in versions])


@applications_bp.route('/<int:app_id>/versions', methods=['POST'])
@jwt_required()
def create_version(app_id: int):
    """Create a new version for an application."""
    app = Application.query.get(app_id)
    if not app:
        return error_response(ErrorCodes.NOT_FOUND, 'Application not found', http_code=404)

    data = request.get_json()
    if not data or not data.get('version'):
        return error_response(ErrorCodes.VALIDATION_ERROR, 'version is required')

    if AppVersion.query.filter_by(appid=app_id, version=data['version']).first():
        return error_response(
            ErrorCodes.CONFLICT,
            f"Version '{data['version']}' already exists for this application",
            http_code=409
        )

    version = AppVersion(
        appid=app_id,
        version=data['version'],
        releasedate=data.get('releasedate'),
        notes=data.get('notes')
    )

    db.session.add(version)
    db.session.commit()

    return success_response(version.to_dict(), message='Version created', http_code=201)


# ---- Machines with this app installed ----

@applications_bp.route('/<int:app_id>/installed', methods=['GET'])
@jwt_required(optional=True)
def list_installed_machines(app_id: int):
    """List all machines that have this application installed."""
    app = Application.query.get(app_id)
    if not app:
        return error_response(ErrorCodes.NOT_FOUND, 'Application not found', http_code=404)

    installed = app.installed_on.filter_by(isactive=True).all()
    data = []
    for i in installed:
        item = i.to_dict()
        if i.machine:
            item['machine'] = {
                'machineid': i.machine.machineid,
                'machinenumber': i.machine.machinenumber,
                'alias': i.machine.alias,
                'hostname': i.machine.hostname
            }
        data.append(item)

    return success_response(data)


# ---- Installed Apps (per machine) ----

@applications_bp.route('/machines/<int:machine_id>', methods=['GET'])
@jwt_required(optional=True)
def list_machine_applications(machine_id: int):
    """List all applications installed on a machine."""
    machine = Machine.query.get(machine_id)
    if not machine:
        return error_response(ErrorCodes.NOT_FOUND, 'Machine not found', http_code=404)

    installed = machine.installedapps.filter_by(isactive=True).all()
    return success_response([i.to_dict() for i in installed])


@applications_bp.route('/machines/<int:machine_id>', methods=['POST'])
@jwt_required()
def install_application(machine_id: int):
    """Install an application on a machine."""
    machine = Machine.query.get(machine_id)
    if not machine:
        return error_response(ErrorCodes.NOT_FOUND, 'Machine not found', http_code=404)

    data = request.get_json()
    if not data or not data.get('appid'):
        return error_response(ErrorCodes.VALIDATION_ERROR, 'appid is required')

    app = Application.query.get(data['appid'])
    if not app:
        return error_response(ErrorCodes.NOT_FOUND, 'Application not found', http_code=404)

    # Check if already installed
    existing = InstalledApp.query.filter_by(
        machineid=machine_id,
        appid=data['appid']
    ).first()

    if existing:
        if existing.isactive:
            return error_response(
                ErrorCodes.CONFLICT,
                'Application already installed on this machine',
                http_code=409
            )
        # Reactivate
        existing.isactive = True
        existing.appversionid = data.get('appversionid')
        existing.installeddate = db.func.now()
        db.session.commit()
        return success_response(existing.to_dict(), message='Application reinstalled')

    installed = InstalledApp(
        machineid=machine_id,
        appid=data['appid'],
        appversionid=data.get('appversionid')
    )

    db.session.add(installed)
    db.session.commit()

    return success_response(installed.to_dict(), message='Application installed', http_code=201)


@applications_bp.route('/machines/<int:machine_id>/<int:app_id>', methods=['DELETE'])
@jwt_required()
def uninstall_application(machine_id: int, app_id: int):
    """Uninstall an application from a machine."""
    installed = InstalledApp.query.filter_by(
        machineid=machine_id,
        appid=app_id,
        isactive=True
    ).first()

    if not installed:
        return error_response(ErrorCodes.NOT_FOUND, 'Application not installed on this machine', http_code=404)

    installed.isactive = False
    db.session.commit()

    return success_response(message='Application uninstalled')


@applications_bp.route('/machines/<int:machine_id>/<int:app_id>', methods=['PUT'])
@jwt_required()
def update_installed_app(machine_id: int, app_id: int):
    """Update installed application (e.g., change version)."""
    installed = InstalledApp.query.filter_by(
        machineid=machine_id,
        appid=app_id,
        isactive=True
    ).first()

    if not installed:
        return error_response(ErrorCodes.NOT_FOUND, 'Application not installed on this machine', http_code=404)

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

    if 'appversionid' in data:
        installed.appversionid = data['appversionid']

    db.session.commit()

    return success_response(installed.to_dict(), message='Installation updated')


# ---- Support Teams ----

@applications_bp.route('/supportteams', methods=['GET'])
@jwt_required(optional=True)
def list_support_teams():
    """List all support teams."""
    teams = SupportTeam.query.filter_by(isactive=True).order_by(SupportTeam.teamname).all()
    data = []
    for team in teams:
        team_dict = team.to_dict()
        team_dict['owner'] = team.owner.appowner if team.owner else None
        data.append(team_dict)
    return success_response(data)


@applications_bp.route('/supportteams', methods=['POST'])
@jwt_required()
def create_support_team():
    """Create a new support team."""
    data = request.get_json()
    if not data or not data.get('teamname'):
        return error_response(ErrorCodes.VALIDATION_ERROR, 'teamname is required')

    team = SupportTeam(
        teamname=data['teamname'],
        teamurl=data.get('teamurl'),
        appownerid=data.get('appownerid')
    )

    db.session.add(team)
    db.session.commit()

    return success_response(team.to_dict(), message='Support team created', http_code=201)


# ---- App Owners ----

@applications_bp.route('/appowners', methods=['GET'])
@jwt_required(optional=True)
def list_app_owners():
    """List all application owners."""
    owners = AppOwner.query.filter_by(isactive=True).order_by(AppOwner.appowner).all()
    return success_response([o.to_dict() for o in owners])


@applications_bp.route('/appowners', methods=['POST'])
@jwt_required()
def create_app_owner():
    """Create a new application owner."""
    data = request.get_json()
    if not data or not data.get('appowner'):
        return error_response(ErrorCodes.VALIDATION_ERROR, 'appowner is required')

    owner = AppOwner(
        appowner=data['appowner'],
        sso=data.get('sso'),
        email=data.get('email')
    )

    db.session.add(owner)
    db.session.commit()

    return success_response(owner.to_dict(), message='App owner created', http_code=201)