import { BuiltInSlotShape, LGraph, LGraphCanvas, LGraphNode, LiteGraph, NodeMode, type MouseEventExt, type Vector2, type Vector4, TitleMode, type ContextMenuItem, type IContextMenuItem, Subgraph, LLink, type NodeID } from "@litegraph-ts/core";
import type ComfyApp from "./components/ComfyApp";
import queueState from "./stores/queueState";
import { get, type Unsubscriber } from "svelte/store";
import uiState from "./stores/uiState";
import layoutState from "./stores/layoutState";
import { Watch } from "@litegraph-ts/nodes-basic";
import { ComfyReroute } from "./nodes";
import type { Progress } from "./components/ComfyApp";
import selectionState from "./stores/selectionState";

export type SerializedGraphCanvasState = {
    offset: Vector2,
    scale: number
}

export default class ComfyGraphCanvas extends LGraphCanvas {
    app: ComfyApp | null;
    private _unsubscribe: Unsubscriber;

    constructor(
        app: ComfyApp,
        canvas: HTMLCanvasElement | string,
        options: {
            skip_render?: boolean;
            skip_events?: boolean;
            autoresize?: boolean;
            viewport?: Vector4;
        } = {}
    ) {
        super(canvas, app.lGraph, options);
        this.app = app;
        this._unsubscribe = selectionState.subscribe(ss => {
            for (const node of Object.values(this.selected_nodes)) {
                node.is_selected = false;
            }
            this.selected_nodes = {}
            for (const node of ss.currentSelectionNodes) {
                this.selected_nodes[node.id] = node;
                node.is_selected = true
            }
            this._selectedNodes = new Set()
            this.setDirty(true, true);
        })
    }

    _selectedNodes: Set<NodeID> = new Set();

    serialize(): SerializedGraphCanvasState {
        let offset = this.ds.offset;
        let scale = this.ds.scale;

        // Use top-level graph for saved offset if we're viewing a subgraph
        if (this._graph_stack?.length > 0) {
            offset = this._graph_stack[0].offset;
            scale = this._graph_stack[0].scale;
        }

        return { offset, scale }
    }

    deserialize(data: SerializedGraphCanvasState) {
        this.ds.offset = data.offset;
        this.ds.scale = data.scale;
    }

    recenter() {
        this.ds.reset();
        this.setDirty(true, true)
    }

    override drawNodeShape(
        node: LGraphNode,
        ctx: CanvasRenderingContext2D,
        size: Vector2,
        fgColor: string,
        bgColor: string,
        selected: boolean,
        mouseOver: boolean
    ): void {
        super.drawNodeShape(node, ctx, size, fgColor, bgColor, selected, mouseOver);

        let state = get(queueState);
        let ss = get(selectionState);
        const isRunningNode = node.id === state.runningNodeID

        let color = null;
        let thickness = 1;
        // if (this._selectedNodes.has(node.id)) {
        //     color = "yellow";
        //     thickness = 5;
        // }
        if (ss.currentHoveredNodes.has(node.id)) {
            color = "lightblue";
        }
        else if (isRunningNode) {
            color = "#0f0";
        }

        if (color) {
            this.drawNodeOutline(node, ctx, size, fgColor, bgColor, color, thickness)
        }

        if (isRunningNode && state.progress) {
            ctx.fillStyle = "green";
            ctx.fillRect(0, 0, size[0] * (state.progress.value / state.progress.max), 6);
            ctx.fillStyle = bgColor;
        }
    }

    private drawNodeOutline(node: LGraphNode, ctx: CanvasRenderingContext2D, size: Vector2, fgColor: string, bgColor: string, outlineColor: string, outlineThickness: number) {
        const shape = node.shape || BuiltInSlotShape.ROUND_SHAPE;
        ctx.lineWidth = outlineThickness;
        ctx.globalAlpha = 0.8;
        ctx.beginPath();
        if (shape == BuiltInSlotShape.BOX_SHAPE)
            ctx.rect(-6, -6 + LiteGraph.NODE_TITLE_HEIGHT, 12 + size[0] + 1, 12 + size[1] + LiteGraph.NODE_TITLE_HEIGHT);
        else if (shape == BuiltInSlotShape.ROUND_SHAPE || (shape == BuiltInSlotShape.CARD_SHAPE && node.flags.collapsed))
            ctx.roundRect(
                -6,
                -6 - LiteGraph.NODE_TITLE_HEIGHT,
                12 + size[0] + 1,
                12 + size[1] + LiteGraph.NODE_TITLE_HEIGHT,
                this.round_radius * 2
            );
        else if (shape == BuiltInSlotShape.CARD_SHAPE)
            ctx.roundRect(
                -6,
                -6 + LiteGraph.NODE_TITLE_HEIGHT,
                12 + size[0] + 1,
                12 + size[1] + LiteGraph.NODE_TITLE_HEIGHT,
                this.round_radius * 2,
                2
            );
        else if (shape == BuiltInSlotShape.CIRCLE_SHAPE)
            ctx.arc(size[0] * 0.5, size[1] * 0.5, size[0] * 0.5 + 6, 0, Math.PI * 2);
        ctx.strokeStyle = outlineColor;
        ctx.stroke();
        ctx.strokeStyle = fgColor;
        ctx.globalAlpha = 1;
    }

    private alignToGrid(node: LGraphNode, ctx: CanvasRenderingContext2D) {
        const x = LiteGraph.CANVAS_GRID_SIZE * Math.round(node.pos[0] / LiteGraph.CANVAS_GRID_SIZE);
        const y = LiteGraph.CANVAS_GRID_SIZE * Math.round(node.pos[1] / LiteGraph.CANVAS_GRID_SIZE);

        const shiftX = x - node.pos[0];
        let shiftY = y - node.pos[1];

        let w, h;
        if (node.flags.collapsed) {
            w = node._collapsed_width;
            h = LiteGraph.NODE_TITLE_HEIGHT;
            shiftY -= LiteGraph.NODE_TITLE_HEIGHT;
        } else {
            w = node.size[0];
            h = node.size[1];
            let titleMode = node.titleMode
            if (titleMode !== TitleMode.TRANSPARENT_TITLE && titleMode !== TitleMode.NO_TITLE) {
                h += LiteGraph.NODE_TITLE_HEIGHT;
                shiftY -= LiteGraph.NODE_TITLE_HEIGHT;
            }
        }
        const f = ctx.fillStyle;
        ctx.fillStyle = "rgba(100, 100, 100, 0.5)";
        ctx.fillRect(shiftX, shiftY, w, h);
        ctx.fillStyle = f;
    }

    override drawNode(node: LGraphNode, ctx: CanvasRenderingContext2D): void {
        if ((window as any)?.app?.shiftDown && this.node_dragged && node.id in this.selected_nodes) {
            this.alignToGrid(node, ctx)
        }

        // Fade out inactive nodes
        var editor_alpha = this.editor_alpha;
        if (node.mode === NodeMode.NEVER) { // never
            this.editor_alpha = 0.4;
        }
        const res = super.drawNode(node, ctx);
        this.editor_alpha = editor_alpha;

        return res;
    }

    override drawGroups(canvas: HTMLCanvasElement, ctx: CanvasRenderingContext2D) {
        if (!this.graph) {
            return;
        }

        var groups = this.graph._groups;

        ctx.save();
        ctx.globalAlpha = 0.7 * this.editor_alpha;

        for (var i = 0; i < groups.length; ++i) {
            var group = groups[i];

            if (!LiteGraph.overlapBounding(this.visible_area, group.bounding)) {
                continue;
            } //out of the visible area

            ctx.fillStyle = group.color || "#335";
            ctx.strokeStyle = group.color || "#335";
            var pos = group.pos;
            var size = group.size;
            ctx.globalAlpha = 0.25 * this.editor_alpha;
            ctx.beginPath();
            var font_size =
                group.fontSize || LiteGraph.DEFAULT_GROUP_FONT_SIZE;
            ctx.rect(pos[0] + 0.5, pos[1] + 0.5, size[0], font_size * 1.4);
            ctx.fill();
            ctx.globalAlpha = this.editor_alpha;
        }

        ctx.restore();

        const res = super.drawGroups(canvas, ctx);
        return res;
    }

    /**
     * Handle keypress
     *
     * Ctrl + M mute/unmute selected nodes
     */
    override processKey(e: KeyboardEvent): boolean | undefined {
        const res = super.processKey(e);

        if (res === false) {
            return res;
        }

        if (!this.graph) {
            return;
        }

        var block_default = false;

        if ("localName" in e.target && e.target.localName == "input") {
            return;
        }

        if (e.type == "keydown") {
            // Ctrl + M mute/unmute
            if (e.keyCode == 77 && e.ctrlKey) {
                if (this.selected_nodes) {
                    for (var i in this.selected_nodes) {
                        if (this.selected_nodes[i].mode === 2) { // never
                            this.selected_nodes[i].mode = 0; // always
                        } else {
                            this.selected_nodes[i].mode = 2; // never
                        }
                    }
                }
                block_default = true;
            }
        }

        this.graph.change();

        if (block_default) {
            e.preventDefault();
            e.stopImmediatePropagation();
            return false;
        }

        return res;
    }

    override onSelectionChange(nodes: Record<number, LGraphNode>) {
        selectionState.update(ss => {
            ss.currentSelectionNodes = Object.values(nodes)
            ss.currentSelection = []
            const ls = get(layoutState)
            for (const node of ss.currentSelectionNodes) {
                const widget = ls.allItemsByNode[node.id]
                if (widget)
                    ss.currentSelection.push(widget.dragItem.id)
            }
            return ss
        })
    }

    override onHoverChange(node: LGraphNode | null) {
        selectionState.update(ss => {
            ss.currentHoveredNodes.clear()
            if (node) {
                ss.currentHoveredNodes.add(node.id)
            }
            ss.currentHovered.clear()
            const ls = get(layoutState)
            for (const nodeID of ss.currentHoveredNodes) {
                const widget = ls.allItemsByNode[nodeID]
                if (widget)
                    ss.currentHovered.add(widget.dragItem.id)
            }
            return ss
        })
    }

    override clear() {
        super.clear();
        selectionState.update(ss => {
            ss.currentSelectionNodes = [];
            ss.currentHoveredNodes.clear()
            return ss;
        })
    }

    override onNodeMoved(node: LGraphNode) {
        if (super.onNodeMoved)
            super.onNodeMoved(node);

        if ((window as any)?.app?.shiftDown) {
            // Ensure all selected nodes are realigned
            for (const id in this.selected_nodes) {
                this.selected_nodes[id].alignToGrid();
            }
        }
    }

    private reinstantiate(_value: IContextMenuItem, _options, mouseEvent, prevMenu, node?: LGraphNode) {
        if ((node as any).isBackendNode)
            return

        const newNode = LiteGraph.createNode(node.type);

        const createInputReroute = (slotIndex: number, link: LLink | null): ComfyReroute => {
            const reroute = LiteGraph.createNode(ComfyReroute);
            reroute.properties.ignoreTypes = true;
            node.graph.add(reroute)
            const inputPos = node.getConnectionPos(true, slotIndex);
            reroute.pos = [inputPos[0] - 140, inputPos[1] + LiteGraph.NODE_SLOT_HEIGHT / 2];
            node.graph.getNodeById(link.origin_id).connect(link.origin_slot, reroute, 0)
            return reroute
        }

        for (let index = node.inputs.length - 1; index >= 0; index--) {
            let link: LLink | null = null;

            link = node.getInputLink(index);
            node.disconnectInput(index)

            if (link)
                createInputReroute(index, link);

            node.removeInput(index);
        }

        for (let index = 0; index < newNode.inputs.length; index++) {
            const newInput = newNode.inputs[index]
            const input = node.addInput(newInput.name, newInput.type);
        }

        const createOutputReroute = (index: number, links: LLink[], connect: boolean = true): ComfyReroute => {
            const reroute = LiteGraph.createNode(ComfyReroute);
            reroute.properties.ignoreTypes = true;
            node.graph.add(reroute)
            const rerouteSize = reroute.computeSize();
            const outputPos = node.getConnectionPos(false, index);
            reroute.pos = [outputPos[0] + rerouteSize[0] + 20, outputPos[1] + LiteGraph.NODE_SLOT_HEIGHT / 2];
            for (const link of links) {
                reroute.connect(0, node.graph.getNodeById(link.target_id), link.target_slot)
            }
            return reroute
        }

        for (let index = node.outputs.length - 1; index >= 0; index--) {
            let links = node.getOutputLinks(index)
            node.disconnectOutput(index)

            if (links.length > 0)
                createOutputReroute(index, links);

            node.removeOutput(index);
        }

        for (let index = 0; index < newNode.outputs.length; index++) {
            const newOutput = newNode.outputs[index]
            const output = node.addOutput(newOutput.name, newOutput.type);
        }
    }

    private convertToSubgraph(_value: IContextMenuItem, _options, mouseEvent, prevMenu, callback?: (node: LGraphNode) => void) {
        if (Object.keys(this.selected_nodes).length === 0)
            return

        const selected = Object.values(this.selected_nodes).filter(n => n != null);
        this.selected_nodes = {}

        const subgraph = LiteGraph.createNode(Subgraph);
        subgraph.buildFromNodes(selected)

        this.graph.add(subgraph)
    }

    override getCanvasMenuOptions(): ContextMenuItem[] {
        const options = super.getCanvasMenuOptions();

        options.push(
            {
                content: "Convert to Subgraph",
                has_submenu: false,
                disabled: Object.keys(this.selected_nodes).length === 0,
                callback: this.convertToSubgraph.bind(this)
            },
        )

        return options
    }

    override getNodeMenuOptions(node: LGraphNode): ContextMenuItem[] {
        const options = super.getNodeMenuOptions(node);

        options.push(
            {
                content: "Reinstantiate",
                has_submenu: false,
                disabled: false,
                callback: this.reinstantiate.bind(this)
            },
        )

        return options
    }
}