import { composePromptPlan } from './prompt_composition.js';
import { planPromptFill, typeTakesPrompt } from './prompt_boxes.js';
import { recordCanvasStep } from './canvas_history.js';

// Shared by Node Assistant and Material Library. No node creation or link edits.
const clone = value => value === undefined ? undefined : JSON.parse(JSON.stringify(value));
const same = (a, b) => JSON.stringify(a) === JSON.stringify(b);

export function selectedMaterialNode(app) {
    const nodes = Object.values(app.canvas?.selected_nodes || {});
    if (nodes.length !== 1 || !nodes[0]) return null;
    const node = nodes[0];
    const graph = app.graph?.getNodeById(node.id) === node ? app.graph : (node.graph || app.canvas?.graph || app.graph);
    return graph?.getNodeById(node.id) === node ? node : null;
}

/** Seeds and the like: values that change on every run and are never applied from a material. */
export function isVolatileWidget(node, widget, index) {
    return /(^|[_\s-])(seed|noise_seed|random_seed|variation_seed|last_seed)([_\s-]|$)/i.test(widget?.name || '')
        || (node.type === 'KSampler' && index === 0) || (node.type === 'KSamplerAdvanced' && index === 1);
}

function hashesFor(graph, id) {
    return Object.fromEntries(Object.entries(graph.extra?.anomalous_hashes || {}).filter(([key]) => key.startsWith(`${id}_`)));
}

function replaceHashes(graph, id, records) {
    if (!Object.keys(records).length && !graph.extra?.anomalous_hashes) return;
    graph.extra ||= {};
    graph.extra.anomalous_hashes ||= {};
    for (const key of Object.keys(graph.extra.anomalous_hashes)) if (key.startsWith(`${id}_`)) delete graph.extra.anomalous_hashes[key];
    Object.assign(graph.extra.anomalous_hashes, clone(records));
}

export function applyNodeMaterialValues(app, node, entries, options = {}) {
    const graph = app.graph?.getNodeById(node?.id) === node ? app.graph : (node?.graph || app.canvas?.graph || app.graph);
    if (!node || graph?.getNodeById(node.id) !== node || !Array.isArray(node.widgets)) throw new Error('materialTargetChanged');
    const changes = entries.filter(({ index }) => !isVolatileWidget(node, node.widgets[index], index));
    if (!changes.length) throw new Error('materialNoCompatibleValues');
    for (const { index, value } of changes) {
        const widget = node.widgets[index];
        if (typeof value === 'number' && !Number.isFinite(value)) throw new Error('materialNoCompatibleValues');
        if (!Number.isInteger(index) || !widget || value === undefined) throw new Error('materialNoCompatibleValues');
        const choices = typeof widget.options?.values === 'function' ? widget.options.values() : widget.options?.values;
        if (Array.isArray(choices) && !choices.includes(value)) throw new Error('materialValueUnavailable');
        if (widget.value != null && (typeof widget.value !== typeof value || Array.isArray(widget.value) !== Array.isArray(value))) throw new Error('materialNoCompatibleValues');
    }
    const previous = node.widgets.map(widget => clone(widget.value));
    const serialized = clone(node.widgets_values);
    const hadExtra = Object.hasOwn(graph, 'extra');
    const hadHashes = !!graph.extra && Object.hasOwn(graph.extra, 'anomalous_hashes');
    const oldHashes = clone(hashesFor(graph, node.id));
    const transportsHashes = options.sourceNodeId !== undefined;
    const mapped = {};
    if (transportsHashes) {
        const prefix = `${options.sourceNodeId}_`;
        for (const [key, value] of Object.entries(options.workflowHashes || {})) {
            if (key.startsWith(prefix)) mapped[`${node.id}_${key.slice(prefix.length)}`] = clone(value);
        }
    }
    const notify = () => {
        graph.change?.();
        graph.setDirtyCanvas?.(true, true);
        app.canvas?.setDirty?.(true, true);
        if (typeof globalThis.CustomEvent === 'function') {
            globalThis.window?.dispatchEvent(new CustomEvent('graphChanged'));
        }
    };
    const restore = () => {
        node.widgets.forEach((widget, index) => { widget.value = clone(previous[index]); });
        if (serialized === undefined) delete node.widgets_values;
        else node.widgets_values = clone(serialized);
        if (transportsHashes) {
            replaceHashes(graph, node.id, oldHashes);
            if (!hadHashes && graph.extra?.anomalous_hashes && !Object.keys(graph.extra.anomalous_hashes).length) delete graph.extra.anomalous_hashes;
            if (!hadExtra && graph.extra && !Object.keys(graph.extra).length) delete graph.extra;
        }
    };
    graph.beforeChange?.();
    try {
        for (const { index, value } of changes) {
            const widget = node.widgets[index];
            widget.value = clone(value);
            if (Array.isArray(node.widgets_values)) node.widgets_values[index] = clone(value);
            widget.callback?.call(widget, widget.value, app.canvas, node);
            node.onWidgetChanged?.(widget.name, widget.value, previous[index], widget);
        }
        if (transportsHashes) replaceHashes(graph, node.id, mapped);
        notify();
    } catch (error) {
        restore();
        notify();
        throw error;
    } finally { graph.afterChange?.(); }
    // `record: false`: the caller makes one Ctrl+Z step of several writes.
    if (options.record !== false) recordCanvasStep(app);
    const appliedSerialized = clone(node.widgets_values);
    const applied = node.widgets.map(widget => clone(widget.value));
    const appliedHashes = clone(hashesFor(graph, node.id));
    let undone = false;
    return {
        widgets: changes.length,
        undo() {
            if (undone || app.graph !== graph || graph.getNodeById(node.id) !== node
                || !same(node.widgets.map(widget => widget.value), applied)
                || !same(node.widgets_values, appliedSerialized)
                || !same(hashesFor(graph, node.id), appliedHashes)) throw new Error('materialUndoChanged');
            graph.beforeChange?.();
            try { restore(); notify(); undone = true; }
            finally { graph.afterChange?.(); }
            if (options.record !== false) recordCanvasStep(app);
        },
    };
}

export function applyMaterialBlock(app, node, block, workflowHashes) {
    if (node?.type !== block?.type || !Array.isArray(block.widgets_values)
        || block.widgets_values.length > (node.widgets?.length || 0)) throw new Error('materialNoCompatibleValues');
    return applyNodeMaterialValues(app, node, block.widgets_values.map((value, index) => ({ index, value })),
        { sourceNodeId: block.node_id, workflowHashes });
}

export const MODEL_EXTENSIONS_REGEX = /\.(safetensors|ckpt|pt|bin|pth|sft|onnx|engine|gguf)$/i;

export function isModelFilePath(value) {
    if (typeof value !== 'string') return false;
    const trimmed = value.trim();
    if (!trimmed) return false;
    const lines = trimmed.split(/[\r\n]+/).map(s => s.trim()).filter(Boolean);
    return lines.length > 0 && lines.every(line => MODEL_EXTENSIONS_REGEX.test(line));
}

export function sanitizePromptText(value) {
    if (typeof value !== 'string') return '';
    const trimmed = value.trim();
    if (!trimmed || isModelFilePath(trimmed)) return '';
    return trimmed;
}

export function formatPromptEnvelope(res = {}) {
    const positive = (res.positive || '').trim();
    const negative = (res.negative || '').trim();
    const singleText = (res.singleText || '').trim();
    const primaryRole = res.primaryRole || 'none';
    const hasPrompt = Boolean(positive || negative || singleText);
    return {
        hasPrompt,
        positive,
        negative,
        singleText,
        primaryRole,
    };
}

function extractFromPlan(payload, data) {
    if (data.kind === 'prompt_plan' || payload.kind === 'prompt_plan' || data.plan || payload.plan) {
        const plan = data.plan || payload.plan || {};
        const composed = composePromptPlan(plan);
        const pos = sanitizePromptText(composed.positive);
        const neg = sanitizePromptText(composed.negative);
        if (pos && neg) return { positive: pos, negative: neg, singleText: pos, primaryRole: 'both' };
        if (pos) return { positive: pos, negative: '', singleText: pos, primaryRole: 'positive' };
        if (neg) return { positive: '', negative: neg, singleText: neg, primaryRole: 'negative' };
    }
    return null;
}

function extractFromNote(payload, data) {
    const note = data.note || payload.note;
    if (!note) return null;
    const isZh = typeof window !== 'undefined' && window.anomalous_browser_lang === 'zh';
    const raw = (isZh && note.promptZh) ? note.promptZh : (note.promptEn || note.promptZh || '');
    const txt = sanitizePromptText(raw);
    if (!txt) return null;

    const lowerName = String(payload.name || note.title || '').toLowerCase();
    const tags = Array.isArray(payload.tags) ? payload.tags.map(t => String(t).toLowerCase()) : [];
    const isNeg = lowerName.includes('negative') || lowerName.includes('负向') || lowerName.includes('反向')
        || tags.some(t => t.includes('negative') || t.includes('负向') || t.includes('反向'));
    return isNeg
        ? { positive: '', negative: txt, singleText: txt, primaryRole: 'negative' }
        : { positive: txt, negative: '', singleText: txt, primaryRole: 'positive' };
}

function extractFromPromptGroups(payload) {
    const groups = payload.prompt_groups;
    if (!groups || typeof groups !== 'object') return null;

    const pgPos = (Array.isArray(groups.positive) ? groups.positive : [])
        .map(sanitizePromptText)
        .filter(Boolean)
        .join('\n\n');
    const pgNeg = (Array.isArray(groups.negative) ? groups.negative : [])
        .map(sanitizePromptText)
        .filter(Boolean)
        .join('\n\n');

    if (pgPos && pgNeg) return { positive: pgPos, negative: pgNeg, singleText: pgPos, primaryRole: 'both' };
    if (pgPos) return { positive: pgPos, negative: '', singleText: pgPos, primaryRole: 'positive' };
    if (pgNeg) return { positive: '', negative: pgNeg, singleText: pgNeg, primaryRole: 'negative' };
    return null;
}

function extractFromNodeBlocks(payload) {
    const blocks = payload.node_blocks;
    if (!Array.isArray(blocks) || blocks.length === 0) return null;

    const promptRoles = payload.prompt_roles;
    const posList = [];
    const negList = [];

    for (const block of blocks) {
        if (!block) continue;
        const blockType = String(block.type || '').toLowerCase();
        const role = promptRoles?.[String(block.node_id)]?.role || block.promptRole;
        const isExplicitPrompt = role === 'positive' || role === 'negative' || role === 'both';
        const isPromptType = typeTakesPrompt(block.type);

        if (!isExplicitPrompt && !isPromptType) continue;

        const widgetValues = Array.isArray(block.widgets_values) ? block.widgets_values : [];
        for (const val of widgetValues) {
            const str = sanitizePromptText(val);
            if (!str) continue;

            if (role === 'negative') {
                negList.push(str);
            } else if (role === 'positive') {
                posList.push(str);
            } else if (role === 'both') {
                posList.push(str);
                negList.push(str);
            } else {
                const blockTitle = String(block.title || block.type || '').toLowerCase();
                if (/negative|负向|反向/i.test(blockTitle)) {
                    negList.push(str);
                } else if (/positive|正向|正面/i.test(blockTitle) || isPromptType) {
                    posList.push(str);
                }
            }
            break;
        }
    }

    const pos = [...new Set(posList)].join('\n\n');
    const neg = [...new Set(negList)].join('\n\n');
    if (pos && neg) return { positive: pos, negative: neg, singleText: pos, primaryRole: 'both' };
    if (pos) return { positive: pos, negative: '', singleText: pos, primaryRole: 'positive' };
    if (neg) return { positive: '', negative: neg, singleText: neg, primaryRole: 'negative' };
    return null;
}

function extractFromSummary(payload) {
    if (payload.kind === 'prompt_text') {
        const raw = sanitizePromptText(payload.summary || payload.name || '');
        if (raw) return { positive: raw, negative: '', singleText: raw, primaryRole: 'positive' };
    }
    return null;
}

export const PROMPT_EXTRACTORS = [
    extractFromPlan,
    extractFromNote,
    extractFromPromptGroups,
    extractFromNodeBlocks,
    extractFromSummary,
];

export function extractMaterialPromptEnvelope(material, payload = {}) {
    const effectivePayload = (payload && Object.keys(payload).length > 0) ? payload : (material || {});
    const data = effectivePayload.data || effectivePayload;

    for (const extractor of PROMPT_EXTRACTORS) {
        const result = extractor(effectivePayload, data);
        if (result && result.primaryRole !== 'none') {
            return formatPromptEnvelope(result);
        }
    }

    return formatPromptEnvelope();
}

export function getMaterialPromptInfo(material) {
    const env = extractMaterialPromptEnvelope(material);
    const isNeg = env.primaryRole === 'negative';
    const text = isNeg
        ? (env.negative || env.singleText)
        : (env.positive || env.singleText || env.negative);
    return {
        text: (text || '').trim(),
        role: isNeg ? 'negative' : 'positive',
    };
}

/**
 * Writes an envelope's prompt text into `node`'s prompt boxes (prompt_boxes.js decides
 * which box takes which text); `box`, one of the node's boxes, limits it to that box.
 */
export function fillPrompt(app, node, envelope, box = null, options = {}) {
    if (!node || !envelope?.hasPrompt) throw new Error('materialNoCompatibleValues');
    const entries = planPromptFill(node, envelope, box);
    if (!entries.length) throw new Error('materialNoCompatibleValues');
    return applyNodeMaterialValues(app, node, entries.map(({ index, value }) => ({ index, value })), options);
}