import { createMachine, sendParent } from 'xstate';
import { validate } from '../../Validation';
import type { IFieldBase } from "$lib/Models";

export type ValidationContext = {};

export const validationMachine = createMachine( 
    {
        initial: 'avalid',
        tsTypes: {} as import("./validationMachine.typegen").Typegen0,
        schema: {
            context: {} as ValidationContext,
            events: {} as 
                { type: 'VALIDATE'; field: IFieldBase } |
                { type: 'VALIDATED'; value: any } |
                { type: 'INVALIDATED'; value: any } 
        },
        states: {
            avalid: {
                on: { 
                    VALIDATE: 'validating', 
                    VALIDATED: 'valid', 
                    INVALIDATED: 'invalid'
                }
            },
            validating: {
                invoke: {
                    id: 'validating',
                    src: 'validation',
                    onDone: {
                        target: 'valid'
                    },
                    onError: 'invalid'
                },
                on: { 
                    VALIDATE: { internal: false }, 
                    VALIDATED: 'valid', 
                    INVALIDATED: 'invalid' 
                }
            },
            invalid: {
                entry: [ 'sendParentInvalid' ],
                on: { VALIDATE: 'validating' }
            },
            valid: {
                entry: [ 'sendParentValid'] ,
                on: { VALIDATE: 'validating' }
            }
        }
    }, 
    { 
        services: { 
            validation: async ( context, event ) => {
                event.field.isValid = await validate( event.field.validation, event.field.value );  
                if(!event.field.isValid){
                    console.log("is invalid --> ", event.field); 
                    throw new Error('Did not validate IN MACHINE.');
                } 
                
                return event.field.isValid;
            }
        },
        actions: {
            sendParentValid: sendParent('VALIDATED'),
            sendParentInvalid: sendParent('INVALIDATED')
        } 
    }
);