import { app } from "../../scripts/app.js";
import { api } from "../../scripts/api.js";

const EXTENSION = "ethanfel.prompt_builder.accumulator_preview";
const NODE_NAME = "SxCPAccumulatorPreview";
const entryCache = new Map();

function widget(node, name) {
    return node.widgets?.find((w) => w.name === name);
}

function hideWidget(w) {
    if (!w) return;
    if (w.origType === undefined) w.origType = w.type;
    w.type = "hidden";
    w.hidden = true;
    w.computeSize = () => [0, -4];
}

function resizeNode(node) {
    const size = node.computeSize?.();
    if (size) node.setSize?.(size);
    app.graph?.setDirtyCanvas(true, true);
}

function nodeKey(nodeOrId) {
    return String(typeof nodeOrId === "object" ? nodeOrId?.id : nodeOrId);
}

function isAccumulatorPreviewNode(node) {
    return node?.comfyClass === NODE_NAME || node?.type === NODE_NAME;
}

function getNodeById(id) {
    return app.graph?.getNodeById?.(Number(id)) || app.graph?._nodes_by_id?.[id] || app.graph?._nodes_by_id?.[Number(id)];
}

function asArray(value) {
    if (!value) return [];
    return Array.isArray(value) ? value : [value];
}

function outputStatus(output) {
    const status = output?.status;
    if (Array.isArray(status)) return status[0] || "";
    return status || "";
}

function outputStoreKey(output) {
    const key = output?.store_key;
    if (Array.isArray(key)) return key[0] || "";
    return key || "";
}

function outputEntries(output) {
    const entries = output?.entries;
    if (!entries) return [];
    if (Array.isArray(entries) && entries.length === 1 && Array.isArray(entries[0])) return entries[0];
    return asArray(entries);
}

function entryLabel(entry) {
    const index = entry?.index ?? "?";
    const id = entry?.id ? ` ${entry.id}` : "";
    const image = entry?.has_image ? " image" : " value";
    const shape = Array.isArray(entry?.shape) && entry.shape.length >= 2 ? ` ${entry.shape[1]}x${entry.shape[0]}` : "";
    const metadata = entry?.has_metadata ? " metadata" : "";
    return `#${index}${id}${image}${shape}${metadata}`.trim();
}

function setStatus(node, status) {
    if (!node._sxcpAccumulatorStatusWidget) return;
    node._sxcpAccumulatorStatusWidget.value = status || "no accumulator data";
    node.setDirtyCanvas?.(true, true);
}

function setEntries(node, entries, status = "") {
    entries = asArray(entries);
    entryCache.set(nodeKey(node), entries);
    node._sxcpAccumulatorEntries = entries;
    if (node._sxcpEntrySelectWidget) {
        const labels = entries.map(entryLabel);
        node._sxcpEntrySelectWidget.options.values = labels.length ? labels : ["no entries"];
        if (!labels.includes(node._sxcpEntrySelectWidget.value)) {
            node._sxcpEntrySelectWidget.value = labels[0] || "no entries";
        }
    }
    setStatus(node, status || `${entries.length} entries`);
    resizeNode(node);
}

function selectedEntry(node) {
    const entries = entryCache.get(nodeKey(node)) || node._sxcpAccumulatorEntries || [];
    const selected = widget(node, "selected_entry")?.value || node._sxcpEntrySelectWidget?.value || "";
    const labels = entries.map(entryLabel);
    const index = labels.indexOf(selected);
    return index >= 0 ? entries[index] : entries[0];
}

function storeKey(node) {
    return String(widget(node, "store_key")?.value || node._sxcpResolvedStoreKey || "").trim();
}

async function postJson(path, payload) {
    const response = await api.fetchApi(path, {
        method: "POST",
        headers: {"Content-Type": "application/json"},
        body: JSON.stringify(payload),
    });
    const data = await response.json();
    if (!response.ok) throw new Error(data?.error || response.statusText);
    return data;
}

async function refreshEntries(node) {
    const key = storeKey(node);
    if (!key) {
        alert("Set the same explicit store_key on the Accumulator and Accumulator Preview first.");
        return;
    }
    try {
        const data = await postJson("/sxcp/accumulator/list", {store_key: key});
        setEntries(node, data.entries || [], data.status || "");
    } catch (err) {
        console.error(`[${EXTENSION}] refresh failed`, err);
        alert(`Refresh failed: ${err}`);
    }
}

async function deleteSelected(node) {
    const key = storeKey(node);
    if (!key) {
        alert("Set the same explicit store_key on the Accumulator and Accumulator Preview first.");
        return;
    }
    const entry = selectedEntry(node);
    if (!entry) {
        alert("No accumulator entry selected.");
        return;
    }
    const label = entryLabel(entry);
    if (!confirm(`Delete accumulator entry ${label}?`)) return;
    try {
        const data = await postJson("/sxcp/accumulator/delete", {
            store_key: key,
            entry_id: entry.id || "",
            index: entry.id ? 0 : entry.index,
            clear: false,
        });
        setEntries(node, data.entries || [], `${data.status || ""}; deleted=${data.removed || 0}; rerun preview to refresh images`);
    } catch (err) {
        console.error(`[${EXTENSION}] delete failed`, err);
        alert(`Delete failed: ${err}`);
    }
}

async function clearStore(node) {
    const key = storeKey(node);
    if (!key) {
        alert("Set the same explicit store_key on the Accumulator and Accumulator Preview first.");
        return;
    }
    if (!confirm(`Clear all entries from accumulator "${key}"?`)) return;
    try {
        const data = await postJson("/sxcp/accumulator/delete", {store_key: key, clear: true});
        setEntries(node, data.entries || [], `${data.status || ""}; cleared=${data.removed || 0}; rerun preview to refresh images`);
    } catch (err) {
        console.error(`[${EXTENSION}] clear failed`, err);
        alert(`Clear failed: ${err}`);
    }
}

function setupNode(node) {
    hideWidget(widget(node, "delete_action"));
    hideWidget(widget(node, "delete_entry_id"));
    hideWidget(widget(node, "delete_index"));

    if (!node._sxcpEntrySelectWidget) {
        node._sxcpEntrySelectWidget = node.addWidget("combo", "selected_entry", "no entries", () => {}, {values: ["no entries"]});
        node._sxcpEntrySelectWidget.serialize = false;
    }
    if (!node._sxcpAccumulatorStatusWidget) {
        node._sxcpAccumulatorStatusWidget = node.addWidget("text", "accumulator_status", "no accumulator data", () => {});
        node._sxcpAccumulatorStatusWidget.serialize = false;
    }
    if (!node._sxcpDeleteSelectedButton) {
        node._sxcpDeleteSelectedButton = node.addWidget("button", "Delete Selected Entry", null, () => deleteSelected(node));
    }
    if (!node._sxcpClearButton) {
        node._sxcpClearButton = node.addWidget("button", "Clear Accumulator", null, () => clearStore(node));
    }
    if (!node._sxcpRefreshButton) {
        node._sxcpRefreshButton = node.addWidget("button", "Refresh Entry List", null, () => refreshEntries(node));
    }
    resizeNode(node);
}

app.registerExtension({
    name: EXTENSION,

    async setup() {
        api.addEventListener("executed", ({detail}) => {
            const node = getNodeById(detail?.node);
            if (!isAccumulatorPreviewNode(node)) return;
            const output = detail?.output || {};
            node._sxcpResolvedStoreKey = outputStoreKey(output);
            setEntries(node, outputEntries(output), outputStatus(output));
        });
    },

    async beforeRegisterNodeDef(nodeType, nodeData) {
        if (nodeData.name !== NODE_NAME) return;

        const onNodeCreated = nodeType.prototype.onNodeCreated;
        nodeType.prototype.onNodeCreated = function () {
            const result = onNodeCreated?.apply(this, arguments);
            setupNode(this);
            return result;
        };

        const onConfigure = nodeType.prototype.onConfigure;
        nodeType.prototype.onConfigure = function () {
            const result = onConfigure?.apply(this, arguments);
            queueMicrotask(() => setupNode(this));
            return result;
        };
    },
});