import React from 'react';
import ImageCreator from './ImageCreator';
import { useNavigate, useLocation } from 'react-router-dom';
import componentTypes from '@data-driven-forms/react-form-renderer/component-types';
import DocumentationButton from '../sharedComponents/DocumentationButton';
import './CreateImageWizard.scss';
import { useDispatch } from 'react-redux';
import api from '../../api';
import { RHEL_8, UNIT_KIB, UNIT_MIB, UNIT_GIB } from '../../constants';
import { composeAdded } from '../../store/actions/actions';
import { addNotification } from '@redhat-cloud-services/frontend-components-notifications/redux';

import {
    review,
    awsTarget,
    registration,
    googleCloudTarger,
    msAzureTarget,
    packages,
    imageOutput,
    fileSystemConfiguration,
    imageName
} from './steps';

import {
    fileSystemConfigurationValidator,
    targetEnvironmentValidator,
} from './validators';

const handleKeyDown = (e, handleClose) => {
    if (e.key === 'Escape') {
        handleClose();
    }
};

const onSave = (values) => {
    let customizations = {
        packages: values['selected-packages']?.map(p => p.name),
    };

    if (values['register-system'] === 'register-now-insights') {
        customizations.subscription = {
            'activation-key': values['subscription-activation-key'],
            insights: true,
            organization: Number(values['subscription-organization-id']),
            'server-url': 'subscription.rhsm.redhat.com',
            'base-url': 'https://cdn.redhat.com/',
        };
    } else if (values['register-system'] === 'register-now') {
        customizations.subscription = {
            'activation-key': values['subscription-activation-key'],
            insights: false,
            organization: Number(values['subscription-organization-id']),
            'server-url': 'subscription.rhsm.redhat.com',
            'base-url': 'https://cdn.redhat.com/',
        };
    }

    if (values['file-system-config-toggle'] === 'manual') {
        customizations.filesystem = [];
        for (let fsc of values['file-system-configuration']) {
            customizations.filesystem.push({
                mountpoint: fsc.mountpoint,
                min_size: fsc.size * fsc.unit,
            });
        }
    }

    let requests = [];
    if (values['target-environment']?.aws) {
        let request = {
            distribution: values.release,
            image_name: values?.['image-name'],
            image_requests: [
                {
                    architecture: 'x86_64',
                    image_type: 'ami',
                    upload_request: {
                        type: 'aws',
                        options: {
                            share_with_accounts: [ values['aws-account-id'] ],
                        },
                    },
                }],
            customizations,
        };
        requests.push(request);
    }

    if (values['target-environment']?.gcp) {
        let share = '';
        switch (values['google-account-type']) {
            case 'googleAccount':
                share = `user:${values['google-email']}`;
                break;
            case 'serviceAccount':
                share = `serviceAccount:${values['google-email']}`;
                break;
            case 'googleGroup':
                share = `group:${values['google-email']}`;
                break;
            case 'domain':
                share = `domain:${values['google-domain']}`;
                break;
        }

        let request = {
            distribution: values.release,
            image_name: values?.['image-name'],
            image_requests: [
                {
                    architecture: 'x86_64',
                    image_type: 'vhd',
                    upload_request: {
                        type: 'gcp',
                        options: {
                            share_with_accounts: [ share ],
                        },
                    },
                }],
            customizations,
        };

        requests.push(request);
    }

    if (values['target-environment']?.azure) {
        let request = {
            distribution: values.release,
            image_name: values?.['image-name'],
            image_requests: [
                {
                    architecture: 'x86_64',
                    image_type: 'vhd',
                    upload_request: {
                        type: 'azure',
                        options: {
                            tenant_id: values['azure-tenant-id'],
                            subscription_id: values['azure-subscription-id'],
                            resource_group: values['azure-resource-group'],
                        },
                    },
                }],
            customizations,
        };
        requests.push(request);
    }

    if (values['target-environment']?.vsphere) {
        let request = {
            distribution: values.release,
            image_name: values?.['image-name'],
            image_requests: [
                {
                    architecture: 'x86_64',
                    image_type: 'vsphere',
                    upload_request: {
                        type: 'aws.s3',
                        options: {}
                    }
                }],
            customizations,
        };
        requests.push(request);
    }

    if (values['target-environment']?.['guest-image']) {
        let request = {
            distribution: values.release,
            image_name: values?.['image-name'],
            image_requests: [
                {
                    architecture: 'x86_64',
                    image_type: 'guest-image',
                    upload_request: {
                        type: 'aws.s3',
                        options: {}
                    }
                }],
            customizations,
        };
        requests.push(request);
    }

    if (values['target-environment']?.['image-installer']) {
        let request = {
            distribution: values.release,
            image_name: values?.['image-name'],
            image_requests: [
                {
                    architecture: 'x86_64',
                    image_type: 'image-installer',
                    upload_request: {
                        type: 'aws.s3',
                        options: {}
                    }
                }],
            customizations,
        };
        requests.push(request);
    }

    return requests;
};

const parseSizeUnit = (bytesize) => {
    let size;
    let unit;

    if (bytesize % UNIT_GIB === 0) {
        size = bytesize / UNIT_GIB;
        unit = UNIT_GIB;
    } else if (bytesize % UNIT_MIB === 0) {
        size = bytesize / UNIT_MIB;
        unit = UNIT_MIB;
    } else if (bytesize % UNIT_KIB === 0) {
        size = bytesize / UNIT_KIB;
        unit = UNIT_KIB;
    }

    return [ size, unit ];
};

const getPackageDescription = async (release, arch, packageName) => {
    const args = [
        release,
        arch,
        packageName
    ];
    let { data, meta } = await api.getPackages(...args);
    let summary;

    // the package should be found in the 0 index
    // if not then fetch all package matches and search for the package
    if (data[0]?.name === packageName) {
        summary = data[0]?.summary;
    } else {
        if (data?.length !== meta.count) {
            ({ data } = await api.getPackages(...args, meta.count));
        }

        const pack = data.find(pack => packageName === pack.name);
        summary = pack?.summary;
    }

    // if no matching package is found return an empty string for description
    return summary || '';
} ;

// map the compose request object to the expected form state
const requestToState = (composeRequest) => {
    if (composeRequest) {
        const imageRequest = composeRequest.image_requests[0];
        const uploadRequest = imageRequest.upload_request;
        let formState = {};

        formState['image-name'] = composeRequest.image_name;

        formState.release = composeRequest?.distribution;
        // set defaults for target environment first
        formState['target-environment'] = {
            aws: false,
            azure: false,
            gcp: false,
            'guest-image': false,
        };
        // then select the one from the request
        // if the image type is to a cloud provider we use the upload_request.type
        // or if the image is intended for download we use the image_type
        let targetEnvironment;
        if (uploadRequest.type === 'aws.s3') {
            targetEnvironment = imageRequest.image_type;
        } else {
            targetEnvironment = uploadRequest.type;
        }

        formState['target-environment'][targetEnvironment] = true;

        if (targetEnvironment === 'aws') {
            formState['aws-account-id'] = uploadRequest?.options?.share_with_accounts[0];
        } else if (targetEnvironment === 'azure') {
            formState['azure-tenant-id'] = uploadRequest?.options?.tenant_id;
            formState['azure-subscription-id'] = uploadRequest?.options?.subscription_id;
            formState['azure-resource-group'] = uploadRequest?.options?.resource_group;
        } else if (targetEnvironment === 'gcp') {
            // parse google account info
            // roughly in the format `accountType:accountEmail`
            const accountInfo = uploadRequest?.options?.share_with_accounts[0];
            const [ accountTypePrefix, account ] = accountInfo.split(':');

            switch (accountTypePrefix) {
                case 'user':
                    formState['google-account-type'] = 'googleAccount';
                    formState['google-email'] = account;
                    break;
                case 'serviceAccount':
                    formState['google-account-type'] = 'serviceAccount';
                    formState['google-email'] = account;
                    break;
                case 'group':
                    formState['google-account-type'] = 'googleGroup';
                    formState['google-email'] = account;
                    break;
                case 'domain':
                    formState['google-account-type'] = 'domain';
                    formState['google-domain'] = account;
                    break;
            }
        }

        // customizations
        // packages
        let packs = [];
        composeRequest?.customizations?.packages?.forEach(async (packName) => {
            const packageDescription = await getPackageDescription(composeRequest?.distribution, imageRequest?.architecture, packName);
            const pack = ({
                name: packName,
                summary: packageDescription
            });
            packs.push(pack);
        });
        formState['selected-packages'] = packs;

        // filesystem
        const fs = composeRequest?.customizations?.filesystem;
        if (fs) {
            formState['file-system-config-toggle'] = 'manual';
            let fileSystemConfiguration = [];
            for (let fsc of fs) {
                const [ size, unit ] = parseSizeUnit(fsc.min_size);
                fileSystemConfiguration.push({
                    mountpoint: fsc.mountpoint,
                    size,
                    unit
                });
            }

            formState['file-system-configuration'] = fileSystemConfiguration;
        }

        // subscription
        const subscription = composeRequest?.customizations?.subscription;
        if (subscription) {
            if (subscription.insights) {
                formState['register-system'] = 'register-now-insights';
            } else {
                formState['register-system'] = 'register-now';
            }

            formState['subscription-activation-key'] = subscription['activation-key'];
            formState['subscription-organization-id'] = subscription.organization;
        } else {
            formState['register-system'] = 'register-later';
        }

        return formState;
    } else {
        return;
    }
};

const formStepHistory = (composeRequest) => {
    if (composeRequest) {
        const imageRequest = composeRequest.image_requests[0];
        const uploadRequest = imageRequest.upload_request;
        let steps = [
            'image-output'
        ];

        if (uploadRequest.type === 'aws') {
            steps.push('aws-target-env');
        } else if (uploadRequest.type === 'azure') {
            steps.push('azure-target-env');
        } else if (uploadRequest.type === 'gcp') {
            steps.push('google-cloud-target-env');
        }

        if (composeRequest?.distribution === RHEL_8) {
            steps.push('registration');
        }

        steps = steps.concat([
            'File system configuration',
            'packages',
            'image-name'
        ]);

        return steps;
    } else {
        return [];
    }
};

const CreateImageWizard = () => {
    const dispatch = useDispatch();
    const navigate = useNavigate();
    const location = useLocation();

    const composeRequest = location?.state?.composeRequest;
    const initialState = requestToState(composeRequest);
    const stepHistory = formStepHistory(composeRequest);

    const handleClose = () => navigate('/');

    return <ImageCreator
        onClose={ handleClose }
        onSubmit={ ({ values, setIsSaving }) => {
            setIsSaving(() => true);
            const requests = onSave(values);
            Promise.all(requests.map(request => api.composeImage(request).then((response) => {
                dispatch(composeAdded({
                    ...response,
                    request,
                    image_status: { status: 'pending' }
                }, true));
            })))
                .then(() => {
                    navigate('/');
                    dispatch(addNotification({
                        variant: 'success',
                        title: 'Your image is being created',
                    }));

                    setIsSaving(false);
                })
                .catch((err) => {
                    dispatch(addNotification({
                        variant: 'danger',
                        title: 'Your image could not be created',
                        description: 'Status code ' + err.response.status + ': ' + err.response.statusText,
                    }));

                    setIsSaving(false);
                });
        } }
        defaultArch="x86_64"
        customValidatorMapper={ { fileSystemConfigurationValidator, targetEnvironmentValidator } }
        schema={ {
            fields: [
                {
                    component: componentTypes.WIZARD,
                    name: 'image-builder-wizard',
                    className: 'image_builder',
                    isDynamic: true,
                    inModal: true,
                    onKeyDown: (e) => { handleKeyDown(e, handleClose); },
                    buttonLabels: {
                        submit: 'Create image',
                    },
                    showTitles: true,
                    title: 'Create image',
                    crossroads: [ 'target-environment', 'release' ],
                    description: <>Image builder allows you to create a custom image and push it to target environments. <DocumentationButton /></>,
                    // order in this array does not reflect order in wizard nav, this order is managed inside
                    // of each step by `nextStep` property!
                    fields: [
                        imageOutput,
                        awsTarget,
                        googleCloudTarger,
                        msAzureTarget,
                        registration,
                        packages,
                        fileSystemConfiguration,
                        imageName,
                        review,
                    ],
                    initialState: {
                        activeStep: location?.state?.initialStep || 'image-output', // name of the active step
                        activeStepIndex: stepHistory.length, // active index
                        maxStepIndex: stepHistory.length, // max achieved index
                        prevSteps: stepHistory, // array with names of previously visited steps
                    }
                }
            ]
        } }
        initialValues={ initialState } />;
};

export default CreateImageWizard;