class App {
    constructor(envelopeKey, envelopeReceiver, documentBytes, licenseKey, locale, container) {
        this.container = container ?? `#${this.constructor.name.toLowerCase()}`;
        this.envelopeKey = envelopeKey
        this.pdfKit = null
        this.currentDocument = envelopeReceiver.envelope.documents[0]
        this.currentReceiver = envelopeReceiver.receiver
        this.signatureCount = envelopeReceiver.envelope.documents[0].elements.length;
        this.envelopeReceiver = envelopeReceiver;
        this.documentBytes = documentBytes;
        this.licenseKey = licenseKey;
        this.locale = locale;
    }

    async init() {
        // Load PSPDFKit
        this.pdfKit = await loadPSPDFKit(this.documentBytes, this.container, this.licenseKey, this.locale)
        addToolbarItems(this.pdfKit, this.handleClick.bind(this))

        this.pdfKit.addEventListener(
            'annotations.load',
            this.handleAnnotationsLoad.bind(this)
        )
        this.pdfKit.addEventListener(
            'annotations.change',
            this.handleAnnotationsChange.bind(this)
        )
        this.pdfKit.addEventListener(
            'annotations.create',
            this.handleAnnotationsCreate.bind(this)
        )

        this.pdfKit.addEventListener("annotations.willChange", _ => {
            Comp.ActPanel.Toggle();
        });

        // Load annotations into PSPDFKit
        try {
            let signatures = await createAnnotations(this.currentDocument, this.envelopeReceiver.envelopeId, this.envelopeReceiver.receiverId);
            await this.pdfKit.create(signatures);
        } catch (e) {
            console.error("Error loading annotations:", e);
        }

        //add click events of external buttons
        [...document.getElementsByClassName('btn_refresh')].forEach(btn => btn.addEventListener('click', _ => this.handleClick('RESET')));
        [...document.getElementsByClassName('btn_complete')].forEach(btn => btn.addEventListener('click', _ => this.handleClick('FINISH')));
        [...document.getElementsByClassName('btn_reject')].forEach(btn => btn.addEventListener('click', _ => this.handleClick('REJECT')));
    }

    handleAnnotationsLoad(loadedAnnotations) {
        loadedAnnotations.toJS()
    }

    handleAnnotationsChange() { }

    async handleAnnotationsCreate(createdAnnotations) {
        const annotation = createdAnnotations.toJS()[0]
        const isFormField = !!annotation.formFieldName
        const isSignature = !!annotation.isSignature

        if (isFormField === false && isSignature === true) {

            const left = annotation.boundingBox.left - 20
            const top = annotation.boundingBox.top - 20
            const width = 150
            const height = 75
            const timestamp = new Date()

            const imageUrl = await createAnnotationFrameBlob(
                this.envelopeReceiver.name,
                this.currentReceiver.signature,
                timestamp,
                width,
                height
            )

            const request = await fetch(imageUrl)
            const blob = await request.blob()
            const imageAttachmentId = await this.pdfKit.createAttachment(blob)

            const frameAnnotation = createImageAnnotation(
                new PSPDFKit.Geometry.Rect({
                    left: left,
                    top: top,
                    width: width,
                    height: height,
                }),
                annotation.pageIndex,
                imageAttachmentId,
                generateId(
                    this.envelopeReceiver.envelopeId,
                    this.envelopeReceiver.receiverId,
                    this.fakeElementId--,
                    'signed'
                )
            )

            this.pdfKit.create(frameAnnotation)
        }
    }

    async handleClick(eventType) {
        let result = false

        switch (eventType) {
            case 'RESET':
                result = await this.handleReset(null)
                Comp.SignatureProgress.SignedCount = 0;
                if (result.isConfirmed) {
                    Swal.fire({
                        title: 'Erfolg',
                        text: 'Dokument wurde zurückgesetzt',
                        icon: 'info',
                    })
                }
                break;

            case 'FINISH':
                result = await this.handleFinish(null)

                if (result == true) {
                    // Redirect to success page after saving to database
                    window.location.href = `/Envelope/${this.envelopeKey}`
                }
                break;

            case 'REJECT':
                Swal.fire({
                    title: localized.rejection,
                    html: `<div class="text-start fs-6 p-0 m-0">${localized.rejectionReasonQ}</div>`,
                    icon: "question",
                    input: "text",
                    inputAttributes: {
                        autocapitalize: "off"
                    },
                    showCancelButton: true,
                    confirmButtonColor: "#3085d6",
                    cancelButtonColor: "#d33",
                    confirmButtonText: localized.complete,
                    cancelButtonText: localized.back,
                    showLoaderOnConfirm: true,
                    preConfirm: async (reason) => {
                        try {
                            var res = await rejectEnvelope(reason);
                            return res;
                        } catch (error) {
                            Swal.showValidationMessage(`
                          Request failed: ${error}
                        `);
                        }
                    },
                    allowOutsideClick: () => !Swal.isLoading()
                }).then((result) => {
                    if (!result.isConfirmed)
                        return;
                    const res = result.value;
                    if (res.ok) {
                        reload()
                    }
                    else
                        Swal.showValidationMessage(`Request failed: ${res.message}`);
                });
                break;
            case 'COPY_URL':
                const url = window.location.href.replace(/\/readonly/gi, '');
                navigator.clipboard.writeText(url).then(function () {
                    bsNotify('Kopiert', { alert_type: 'success', delay: 4, icon_name: 'check_circle' });
                }).catch(function (err) {
                    bsNotify('Unerwarteter Fehler', { alert_type: 'danger', delay: 4, icon_name: 'error' });
                });
                break;

            case 'SHARE':
                // Show the modal
                Comp.ShareBackdrop.show();
                break;
            case 'LOGOUT':
                await logout();
                break;
        }
    }

    async handleFinish(event) {
        const iJSON = await this.pdfKit.exportInstantJSON()

        const iFormFieldValues = iJSON.formFieldValues;

        //check required
        const iReqFields = iFormFieldValues.filter(f => isFieldRequired(f))
        const hasEmptyReq = iReqFields.some(f => (f.value === undefined || f.value === null || f.value === ""))

        if (hasEmptyReq) {
            Swal.fire({
                title: 'Warnung',
                text: 'Bitte füllen Sie alle Standortinformationen vollständig aus!',
                icon: 'warning',
            })
            return false;
        }

        //check city
        const city_regex = new RegExp("^[a-zA-Z\\u0080-\\u024F]+(?:([\\ \\-\\']|(\\.\\ ))[a-zA-Z\\u0080-\\u024F]+)*$")
        const iCityFields = iFormFieldValues.filter(f => isCityField(f))
        for (var f of iCityFields)
            if (!IS_MOBILE_DEVICE && !city_regex.test(f.value)) {
                Swal.fire({
                    title: 'Warnung',
                    text: `Bitte überprüfen Sie die eingegebene Ortsangabe "${f.value}" auf korrekte Formatierung. Beispiele für richtige Formate sind: München, Île-de-France, Sauðárkrókur, San Francisco, St. Catharines usw.`,
                    icon: 'warning',
                })
                return false;
            }

        //check # of signature
        const validationResult = await this.validateAnnotations(this.signatureCount)
        if (validationResult === false) {
            Swal.fire({
                title: 'Warnung',
                text: 'Es wurden nicht alle Signaturfelder ausgefüllt!',
                icon: 'warning',
            })
            return false
        }

        return Swal.fire({
            title: localized.confirmation,
            html: `<div class="text-start fs-6 p-0 m-0">${localized.sigAgree}</div>`,
            icon: "question",
            showCancelButton: true,
            confirmButtonColor: "#3085d6",
            cancelButtonColor: "#d33",
            confirmButtonText: localized.finalize,
            cancelButtonText: localized.back
        }).then(async (result) => {
            if (result.isConfirmed) {
                //---
                // Save changes before doing anything
                try {
                    await this.pdfKit.save()
                } catch (e) {
                    Swal.fire({
                        title: 'Fehler',
                        text: 'Umschlag konnte nicht signiert werden!',
                        icon: 'error',
                    })
                    return false
                }

                // Export annotation data and save to database
                try {
                    const res = await signEnvelope({
                        instant: iJSON,
                        structured: mapSignature(iJSON)
                    });

                    if (!res.ok) {
                        if (res.status === 403) {
                            Swal.fire({
                                title: 'Warnung',
                                text: 'Umschlag ist nicht mehr verfügbar.',
                                icon: 'warning',
                            })
                            return false
                        }
                        else {
                            throw new Error()
                        }
                    } else
                        return true
                } catch (e) {
                    Swal.fire({
                        title: 'Fehler',
                        text: 'Umschlag konnte nicht signiert werden!',
                        icon: 'error',
                    })
                    return false
                }
            }
            else
                return false;
        });
    }

    async validateAnnotations(totalSignatures) {
        const annotations = await getAnnotations(this.pdfKit)
        const filtered = annotations
            .map(a => a.toJS())
            .filter(a => a.isSignature)

        return totalSignatures <= filtered.length
    }

    async handleReset(event) {
        const result = Swal.fire({
            title: 'Sind sie sicher?',
            text: 'Wollen Sie das Dokument und alle erstellten Signaturen zurücksetzen?',
            icon: 'question',
            showCancelButton: true
        })

        if (result.isConfirmed) {
            const result = await deleteAnnotations(this.pdfKit)
        }

        return result
    }

    fakeElementId = 0;
}