@Blog

const { createApp, ref, onMounted, nextTick } = Vue;

const app = createApp({
    setup() {
        const canvas = ref(null);
        const languageInput = ref('');
        const fontsize = ref(16);
        const alertMessage = ref('');
        const mobileText = ref('');
        const isMobile = ref(window.innerWidth <= 768);

        const fetchText = async (flg) => {
            try {
                const body = new FormData();
                body.append('txt', languageInput.value);

                const response = await fetch("/common/jpcvn", {
                    method: "POST",
                    headers: { "X-CSRF-TOKEN": document.querySelector("[name='token']").value },
                    body: body
                });
                const resultdata = await response.json();
                drawCanvas(resultdata.txt);
                mobileHxH(resultdata.txt);

                canvas.value.toBlob((blob) => {
                    const formData = new FormData();
                    formData.append("upload_data", blob, "canvas_image.png");
                    formData.append("name", document.getElementsByName("name")[0].value);
                    formData.append("sns_name", document.getElementById("sns").value);
                    formData.append("text_data", resultdata.txt);
                    if (!flg) formSave(formData);
                }, "image/png");
            } catch (error) {
                console.error(error);
            }
        };

        const drawCanvas = async (text) => {
            await nextTick();
            if (!canvas.value) return;  // canvasがnullの場合は処理を中止
            const ctx = canvas.value.getContext("2d");
            ctx.clearRect(0, 0, canvas.value.clientWidth, canvas.value.clientHeight);

            const background = new Image();
            background.src = "/images/paper_00107.jpg";
            background.onload = () => {
                ctx.drawImage(background, 0, 0, canvas.value.clientWidth, canvas.value.clientHeight);
                ctx.fillStyle = "rgba(0, 0, 0)";
                ctx.font = `${fontsize.value}px HUNTERxHUNTER`;
                const lines = textChange(text, fontsize.value);
                lines.forEach((line, i) => {
                    ctx.fillText(line, 3, 10 + fontsize.value * (1.1618 * i + 1));
                });
            };
        };


        const textChange = (t, f) => {
            let n = parseInt(350 / f);
            let s = t.split("");
            let LLine = 0;
            for (let i = 0; i < s.length; i++) {
                if (LLine && (LLine + 1) % n === 0) {
                    if (s[i] !== "\n") s[i] += "\n";
                    LLine = 0;
                } else {
                    LLine++;
                    if (s[i] === "\n") LLine = 0;
                }
            }
            return s.join("").split("\n");
        };

        const formSave = async (formData) => {
            alertMessage.value = '';
            try {
                const response = await fetch("/common/image_save", {
                    method: "POST",
                    headers: { "X-CSRF-TOKEN": document.querySelector("[name='token']").value },
                    body: formData,
                });
                const result = await response.json();
                if (result.ret === "ok" && result.url) {
                    window.location.href = result.url;
                } else {
                    alertMessage.value = result.txt;
                }
            } catch (error) {
                console.error(error);
            }
        };

        const mobileHxH = (tt) => {
            if (isMobile.value) {
                mobileText.value = tt;
            }
        };

        const adjustTextareaRows = () => {
            isMobile.value = window.innerWidth <= 768;
        };

        onMounted(() => {
            adjustTextareaRows();
            window.addEventListener("resize", adjustTextareaRows);
        });

        return {
            canvas,
            languageInput,
            fetchText,
            alertMessage,
            mobileText,
            isMobile,
            fontsize
        };
    }
});

app.mount('#app');