/* =========================================================
   JOBALIGN AI CLIENT

   A product by John_D

   Resume generation now runs through the
   Cloudflare Worker backend.

   No local LLM download.
   No WebGPU.
   No WASM model.
========================================================= */


const JOBALIGN_BACKEND =
    "https://jobalign-adzuna-proxy.darbymjohn.workers.dev";


/* =========================================================
   STATUS
========================================================= */

function setAIStatus(
    message,
    type = "normal"
) {

    const status =
        document.getElementById(
            "generationStatus"
        );


    if (!status) {
        return;
    }


    let className = "";


    if (type === "success") {

        className =
            "success-text";

    } else if (type === "error") {

        className =
            "danger-text";

    } else if (type === "warning") {

        className =
            "warning-text";
    }


    status.innerHTML = `

        <div class="status-dot"></div>

        <span class="${className}">
            ${escapeHTML(message)}
        </span>
    `;
}


/* =========================================================
   GENERATE RESUME
========================================================= */

async function generateResume({
    resume,
    jobDescription,
    jobTitle,
    company,
    location
}) {

    if (
        !resume ||
        resume.trim().length < 100
    ) {

        throw new Error(
            "Master resume is missing."
        );
    }


    if (
        !jobDescription ||
        jobDescription.trim().length < 100
    ) {

        throw new Error(
            "Job description is missing."
        );
    }


    setAIStatus(
        "Analyzing job and rebuilding resume..."
    );


    const response =
        await fetch(
            JOBALIGN_BACKEND + "/resume",
            {
                method:
                    "POST",

                headers: {
                    "Content-Type":
                        "application/json",

                    "Accept":
                        "application/json"
                },

                body:
                    JSON.stringify({
                        resume:
                            resume,

                        jobDescription:
                            jobDescription,

                        jobTitle:
                            jobTitle,

                        company:
                            company,

                        location:
                            location
                    })
            }
        );


    let data;


    try {

        data =
            await response.json();

    } catch (error) {

        throw new Error(
            "Resume service returned an unreadable response."
        );
    }


    if (!response.ok) {

        const details =
            data.details
                ? " " + data.details
                : "";


        throw new Error(
            (
                data.error ||
                "Resume generation failed."
            ) +
            details
        );
    }


    if (
        !data.ok ||
        !data.resume
    ) {

        throw new Error(
            "Resume service did not return a completed resume."
        );
    }


    const generatedResume =
        String(
            data.resume
        ).trim();


    if (
        generatedResume.length < 300
    ) {

        throw new Error(
            "The generated resume was incomplete."
        );
    }


    setAIStatus(
        "Targeted resume generated",
        "success"
    );


    return generatedResume;
}


/* =========================================================
   OPTIONAL HEALTH CHECK
========================================================= */

async function checkBackend() {

    try {

        const response =
            await fetch(
                JOBALIGN_BACKEND +
                "/health"
            );


        const data =
            await response.json();


        return Boolean(
            response.ok &&
            data.ok &&
            data.aiConfigured
        );


    } catch (error) {

        console.error(
            "JobAlign backend health check failed:",
            error
        );


        return false;
    }
}


/* =========================================================
   HTML SAFETY
========================================================= */

function escapeHTML(
    value
) {

    const element =
        document.createElement(
            "div"
        );


    element.textContent =
        String(
            value || ""
        );


    return element.innerHTML;
}


/* =========================================================
   EXPOSE TO APP.JS
========================================================= */

window.JobAlignAI = {

    generateResume:
        generateResume,

    checkBackend:
        checkBackend,

    mode:
        "cloudflare-workers-ai"
};


window.dispatchEvent(
    new CustomEvent(
        "jobalign-ai-ready"
    )
);