/**
 * @node sdcpp-upscale
 * @name SD.cpp Upscale
 * @category sdcpp
 * @version 1.0.0
 * @description Enlarge an image with the loaded upscaler
 * @icon maximize-2
 */

// The credential this node wants, named so it can be found. It is stored as a
// plain basic credential - that is what decides how it is encrypted - and this
// only says which basic credential is the SD.cpp one. Anything that accepts a
// basic credential still accepts this, and this node still accepts a plain
// basic credential, because the shape is identical.
const credentialTypes = [
    {
        id: 'sdcpp',
        label: 'SD.cpp Server',
        baseType: 'basic',
        description: 'The username and password you sign in to sdcpp-restapi with. The node exchanges them for a token before every call',
        usernameLabel: 'Username',
        passwordLabel: 'Password'
    }
];

const configSchema = {
    type: 'object',
    // Generated from the server's own reference at /options/generation - see
    // scripts/gen-sdcpp-generation-options.py. Every field the endpoint accepts
    // has a setting here, grouped the way the server groups them.
    uiGroups: [
            {
                    "title": "Server",
                    "fields": [
                            "serverUrl",
                            "credentialId"
                    ]
            },
            {
                    "title": "/upscale Endpoint",
                    "fields": [
                            "imageBase64",
                            "jobId",
                            "imageIndex",
                            "upscaleFactor",
                            "tileSize",
                            "repeats"
                    ]
            },
            {
                    "title": "Job",
                    "fields": [
                            "title",
                            "extraOptions",
                            "timeout"
                    ]
            }
    ],
    prefill: {
            "label": "Take the architecture defaults",
            "description": "Fill these in from the preset for whichever model the server has loaded - the same values it would use if these were left empty",
            "node": "sdcpp-architecture",
            "needs": [
                    "serverUrl",
                    "credentialId"
            ],
            "map": {}
    },
    properties: {
        serverUrl: {
            type: 'string', title: 'Server URL',
            description: 'Base address of the sdcpp-restapi server',
            default: 'http://localhost:8077'
        },
        credentialId: {
            type: 'string', title: 'Credential',
            description: 'A basic credential holding the sdcpp-restapi username and password',
            dynamicOptions: { source: 'credentials', filter: { type: ['sdcpp', 'basic'] } }
        },
        imageBase64: { title: "Source Image (base64)", description: "Base64-encoded source image for upscaling. Recommended: Required. Leave empty for the architecture default.", type: "string" },
        imageIndex: { title: "Source Image Index", description: "Which output of the source job to upscale. Used with `job_id` when the source job produced multiple images (e.g. batch_count > 1). Ignored when `job_id` is absent. 0-based: 0 = first output. Recommended: Leave at 0 unless the source job had batch_count > 1 and you want a specific image. Leave empty for the architecture default.", type: "number" },
        jobId: { title: "Source Job ID", description: "Convenience: use the output of an existing completed job as the source for upscaling, instead of providing `image_base64`. handle_upscale loads `outputs[image_index]` from disk, base64-encodes it, and substitutes `image_base64` before the worker runs — so to the worker the two paths are indistinguishable. Recommended: Use this when chaining 'generate, then upscale' from a queued job. Leave empty for the architecture default.", type: "string" },
        repeats: { title: "Upscale Repeats", description: "Run the upscaler N times. With a 4× model: 1 pass = 4×, 2 passes = 16×. Recommended: 1. Leave empty for the architecture default.", type: "number" },
        tileSize: { title: "Upscale Tile Size", description: "Tile size for streaming the source image through the upscaler. Smaller = less VRAM, more boundary artifacts. 0 = whole-image. Recommended: 128 default. Drop to 64 if hitting VRAM limits. Leave empty for the architecture default.", type: "number" },
        upscaleFactor: { title: "Upscale Factor", description: "Target upscale factor. 4 = 4× the source image (default for ESRGAN). Recommended: Match the loaded upscaler's native factor (4 for most ESRGAN variants). Leave empty for the architecture default.", type: "number" },
        title: { type: "string", title: "Job Title", description: "Optional label stored with the job, useful for finding it again in the queue" },
        extraOptions: { type: "object", title: "Extra Options", description: "Any other generation field passed straight through. Everything the server documents already has a setting above, so this is only needed for a field a newer server has gained" },
        timeout: { type: "number", title: "Timeout (ms)", description: "Applies to queueing the job, not to the render. The call returns as soon as the job is accepted", default: 30000 }
    },
    required: ['credentialId']
};

const inputSchema = { type: 'object', properties: { data: { type: 'any' } } };

const outputSchema = {
    type: 'object',
    properties: {
        jobId: { type: 'string', description: 'Id of the queued job, to pass to SD.cpp Wait For Job' },
        status: { type: 'string', description: 'Queue status when the job was accepted, normally pending' },
        position: { type: 'number', description: 'Place in the queue' },
        request: { type: 'object', description: 'The body actually sent, useful for seeing which defaults were left to the server' }
    }
};

function normalizeServer(url) {
    const value = String(url || '').trim();
    if (!value) {
        throw new Error('SD.cpp: a server URL is required, such as http://localhost:8077');
    }
    return value.replace(/\/+$/, '');
}

function readCredential(credentialId) {
    const auth = smartbotic.credentials.get(credentialId);
    if (!auth || auth.success !== true) {
        throw new Error('SD.cpp: could not read the credential: ' +
            ((auth && auth.error) || 'unknown error'));
    }

    const value = auth.headerValue || '';
    if (value.indexOf('Basic ') !== 0) {
        throw new Error('SD.cpp: the credential must be a basic one, holding the sdcpp-restapi ' +
            'username and password');
    }

    const decoded = smartbotic.utils.base64Decode(value.substring(6));
    const separator = decoded.indexOf(':');
    if (separator < 1) {
        throw new Error('SD.cpp: the credential is malformed, expected a username and a password');
    }

    return {
        username: decoded.substring(0, separator),
        password: decoded.substring(separator + 1)
    };
}

function call(options) {
    const response = smartbotic.http.request(options);

    let body = response.data;
    if (typeof body === 'string' && body.length > 0) {
        try {
            body = JSON.parse(body);
        } catch (e) {
            const snippet = body.substring(0, 200).replace(/\s+/g, ' ');
            throw new Error('SD.cpp: ' + options.what + ' returned HTTP ' + response.status +
                ' with a body that is not JSON: ' + snippet);
        }
    }

    if (response.status < 200 || response.status >= 300) {
        const detail = (body && (body.message || body.error)) || ('HTTP ' + response.status);
        throw new Error('SD.cpp: ' + options.what + ' failed: ' + detail);
    }

    return body || {};
}

function login(server, credential, timeout) {
    const session = call({
        method: 'POST',
        url: server + '/auth/login',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
            username: credential.username,
            password: credential.password
        }),
        timeout: timeout,
        what: 'signing in'
    });

    if (!session.token) {
        throw new Error('SD.cpp: the server accepted the login but returned no token');
    }
    return session.token;
}

// /health is unauthenticated, and it is the only way to find out what is
// already loaded without asking for a token first.
function readHealth(server, timeout) {
    return call({
        method: 'GET',
        url: server + '/health',
        timeout: timeout,
        what: 'reading server health'
    });
}

function putIfSet(target, key, value) {
    if (value === undefined || value === null || value === '') {
        return;
    }
    target[key] = value;
}

// Every generation field the server documents, and the setting it comes
// from. Generated alongside the schema above so the two cannot drift.
const GENERATION_OPTIONS = [
    { setting: "imageBase64", server: "image_base64" },
    { setting: "imageIndex", server: "image_index" },
    { setting: "jobId", server: "job_id" },
    { setting: "repeats", server: "repeats" },
    { setting: "tileSize", server: "tile_size" },
    { setting: "upscaleFactor", server: "upscale_factor" }
];

async function execute(config, input, context) {
    const server = normalizeServer(config.serverUrl);
    const timeout = config.timeout || 30000;

    const credential = readCredential(config.credentialId);
    const token = login(server, credential, timeout);

    const body = {};

    // Built from the table above rather than field by field, so a setting the
    // server documents cannot be quietly missing from the request. A setting
    // left empty is left out of the body entirely: the server fills an absent
    // field from the loaded model's architecture preset, and sending an empty
    // box as 0 would override that preset with nonsense. The test is emptiness,
    // never truthiness - seed 0 and clip_skip 0 are legitimate values.
    for (let i = 0; i < GENERATION_OPTIONS.length; i++) {
        const option = GENERATION_OPTIONS[i];
        const value = config[option.setting];
        if (Array.isArray(value)) {
            if (value.length > 0) {
                body[option.server] = value;
            }
        } else {
            putIfSet(body, option.server, value);
        }
    }
    putIfSet(body, 'title', config.title);

    if (!body.image_base64) {
        throw new Error('SD.cpp: upscale needs an image');
    }

    // Anything else the API accepts, passed through, so a new server field does
    // not need a node change to be reachable.
    const extra = config.extraOptions;
    if (extra && typeof extra === 'object') {
        const keys = Object.keys(extra);
        for (let i = 0; i < keys.length; i++) {
            putIfSet(body, keys[i], extra[keys[i]]);
        }
    }

    const queued = call({
        method: 'POST',
        url: server + '/upscale',
        headers: { 'Content-Type': 'application/json', 'Authorization': 'Bearer ' + token },
        body: JSON.stringify(body),
        timeout: timeout,
        what: 'queueing the upscale job'
    });

    if (!queued.job_id) {
        throw new Error('SD.cpp: the job was accepted but no job id came back');
    }

    smartbotic.log.info('SD.cpp: queued upscale job ' + queued.job_id);

    return {
        jobId: queued.job_id,
        status: queued.status || 'pending',
        position: queued.position !== undefined ? queued.position : -1,
        request: body
    };
}

module.exports = { configSchema, inputSchema, outputSchema, execute };