Service architecture

import { defaultNode } from "@/components/diagram/flow-diagram";
import {
  SizedBox,
  Expanded,
  LayoutBuilder,
  Border,
  BorderRadius,
  BoxDecoration,
  Column,
  Container,
  CrossAxisAlignment,
  EdgeInsets,
  GestureDetector,
  MainAxisSize,
  Positioned,
  Row,
  Stack,
  StackFit,
  State,
  StatefulWidget,
  Text,
  TextStyle,
  type Widget,
} from "flitterjs";
import {
  FlowDiagramController,
  createId,
  layeredLayout,
  type FlowNode,
  type FlowEdge,
} from "@flitterjs/diagram";
import FlowDiagram from "@/components/diagram/flow-diagram";

type Theme = "light" | "dark";
class Deployment extends StatefulWidget {
  constructor(readonly theme: Theme) {
    super(theme);
  }
  createState() {
    return new DeploymentState();
  }
}
class DeploymentState extends State<Deployment> {
  flow = new FlowDiagramController();
  diagram?: Widget;
  references = true;
  selected: string | null = "api";
  initialized = false;
  nodes: FlowNode[] = [
    {
      id: "production",
      type: "frame",
      position: { x: 20, y: 50 },
      width: 760,
      height: 340,
      data: { label: "Production", size: [760, 340] },
      collapsible: true,
    },
    {
      id: "api",
      selected: true,
      parentId: "production",
      position: { x: 25, y: 60 },
      data: {
        label: "checkout-api",
        kind: "SERVICE",
        status: "Healthy",
        region: "us-east-1",
        deploy: "2m ago · 8f3a921",
        detail: "3 replicas · 42 req/s",
        color: "#16a34a",
      },
    },
    {
      id: "worker",
      parentId: "production",
      position: { x: 25, y: 205 },
      data: {
        label: "receipt-worker",
        kind: "SERVICE",
        status: "Degraded",
        region: "us-east-1",
        deploy: "6m ago · 72b0f19",
        detail: "SMTP timeout · 12 retries",
        color: "#dc2626",
      },
    },
    {
      id: "storage",
      type: "frame",
      parentId: "production",
      position: { x: 360, y: 45 },
      width: 350,
      height: 270,
      data: { label: "Managed storage", size: [350, 270] },
      collapsible: true,
    },
    {
      id: "db",
      parentId: "storage",
      position: { x: 25, y: 45 },
      data: {
        label: "postgres-primary",
        kind: "DATABASE",
        status: "Healthy",
        region: "us-east-1",
        deploy: "PostgreSQL 16.3",
        detail: "18 GB / 50 GB",
        color: "#2563eb",
      },
    },
    {
      id: "assets",
      parentId: "storage",
      position: { x: 25, y: 155 },
      data: {
        label: "invoice-exports",
        kind: "BUCKET",
        status: "Healthy",
        region: "us-east-1",
        deploy: "Private · encrypted",
        detail: "4,218 objects",
        color: "#7c3aed",
      },
    },
    // Group toolbars sit at the top-right corner so the header panel never covers them.
  ].map((n) =>
    n.type === "frame"
      ? { ...n, toolbar: { align: "end" as const } }
      : { ...n, type: "service", width: 225, height: 90 },
  );
  edges: FlowEdge[] = [
    { id: "database-url", source: "api", target: "db", label: "DATABASE_URL" },
    { id: "queue-db", source: "worker", target: "db", label: "DATABASE_URL" },
    {
      id: "bucket-url",
      source: "worker",
      target: "assets",
      label: "EXPORT_BUCKET",
    },
  ].map((e) => ({
    ...e,
    type: "smoothstep",
    hidden: false,
    markerEnd: "arrowclosed",
  }));
  get colors() {
    return this.widget.theme === "dark"
      ? {
          bg: "#131720",
          card: "#202633",
          ink: "#e7edf8",
          muted: "#94a3b8",
          line: "#384255",
        }
      : {
          bg: "#f6f8fc",
          card: "#ffffff",
          ink: "#202b40",
          muted: "#64748b",
          line: "#dbe2ed",
        };
  }
  text(value: string, size = 12, color = this.colors.ink) {
    return Text(value, {
      style: new TextStyle({
        fontFamily: "system-ui",
        fontSize: Math.max(13, size),
        color,
      }),
    });
  }
  button(label: string, action: () => void) {
    return GestureDetector({
      onMouseDown: (e) => e.stopPropagation(),
      onClick: (e) => {
        e.stopPropagation();
        action();
      },
      child: Container({
        padding: EdgeInsets.symmetric({ horizontal: 10, vertical: 8 }),
        child: this.text(
          label,
          12,
          this.widget.theme === "dark" ? "#b6a2f5" : "#6951b5",
        ),
      }),
    });
  }
  box(children: Widget[], width?: number): Widget {
    return Container({
      width,
      padding: EdgeInsets.all(12),
      decoration: new BoxDecoration({
        color: this.colors.card,
        border: Border.all({ color: this.colors.line, width: 1 }),
        borderRadius: BorderRadius.circular(10),
      }),
      child: Column({
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.start,
        children,
      }),
    });
  }
  status(n: FlowNode) {
    return Row({
      mainAxisSize: MainAxisSize.min,
      children: [
        this.text(String(n.data.kind), 10, this.colors.muted),
        Container({
          margin: EdgeInsets.only({ left: 8 }),
          padding: EdgeInsets.symmetric({ horizontal: 6, vertical: 2 }),
          decoration: new BoxDecoration({
            color: this.colors.bg,
            borderRadius: BorderRadius.circular(20),
          }),
          child: this.text(`● ${n.data.status}`, 10, String(n.data.color)),
        }),
      ],
    });
  }
  fold(id: string) {
    const n = this.flow.getNode(id)!;
    const descendants = this.flow.nodes.filter((child) => {
      let p = child.parentId;
      while (p) {
        if (p === id) return true;
        p = this.flow.getNode(p)?.parentId;
      }
      return false;
    });
    this.flow.history.mark("Fold group");
    this.flow.run(
      () => {
        // Body collapse is one level deep; remember which nested frames were open.
        if (!n.collapsed) {
          const open = descendants
            .filter((c) => c.type === "frame" && !c.collapsed)
            .map((c) => c.id);
          this.flow.updateNodeData(id, {
            reopen: open,
            size: [n.width, n.height],
          });
          open.forEach((child) => this.flow.collapse(child));
          this.flow.collapse(id);
          this.flow.updateNode(id, { width: 225, height: 50 });
        } else {
          this.flow.expand(id);
          ((n.data.reopen as string[]) ?? []).forEach((child) =>
            this.flow.expand(child),
          );
          const [width, height] = n.data.size as number[];
          this.flow.updateNode(id, { width, height });
        }
      },
      { history: "merge" },
    );
    this.setState();
  }
  newGroup(position: { x: number; y: number }) {
    const picked = this.flow.getSelectedNodes(),
      ids = new Set(picked.map((n) => n.id));
    const selected = picked.filter((n) => {
      let p = n.parentId;
      while (p) {
        if (ids.has(p)) return false;
        p = this.flow.getNode(p)?.parentId;
      }
      return true;
    });
    const bounds = selected.length
      ? this.flow.getNodesBounds(selected)
      : { ...position, width: 280, height: 160 };
    const id = createId("group");
    this.flow.history.mark("Group services");
    this.flow.run(
      () => {
        this.flow.addNodes({
          id,
          type: "frame",
          position: { x: bounds.x - 20, y: bounds.y - 45 },
          width: bounds.width + 40,
          height: bounds.height + 65,
          data: {
            label: "New environment",
            size: [bounds.width + 40, bounds.height + 65],
          },
          collapsible: true,
        });
        selected.forEach((n) => this.flow.setParent(n.id, id));
      },
      { history: "merge" },
    );
  }
  createDiagram(): Widget {
    const c = this.colors;
    return FlowDiagram({
      controller: this.flow,
      data: { nodes: this.nodes, edges: this.edges },
      viewport: { fitView: { padding: 0.12, maxZoom: 1 }, minZoom: 0.2 },
      config: {
        edgeLabel: { fontSize: 13 },
        colorMode: this.widget.theme,
        colors: { background: c.bg },
        controls: { position: "bottom-left" },
        minimap: { visible: false },
        contextMenu: {},
      },
      on: {
        init: () =>
          this.setState(() => {
            this.initialized = true;
          }),
        selectionChange: ({ nodes }) =>
          this.setState(() => {
            this.selected = nodes.find((n) => n.type !== "frame")?.id ?? null;
          }),
        delete: ({ nodes }) => {
          if (nodes.some((n) => n.id === this.selected))
            this.setState(() => {
              this.selected = null;
            });
        },
      },
      custom: {
        node: (args, ctx) => {
          const views: Record<string, typeof defaultNode> = {
            frame: ({ node, isCollapsed: collapsed, hiddenChildCount }) =>
              Container({
                padding: EdgeInsets.all(12),
                decoration: new BoxDecoration({
                  color: c.bg,
                  border: Border.all({ color: "#8895ae", width: 1 }),
                  borderRadius: BorderRadius.circular(12),
                }),
                child: this.text(
                  `${collapsed ? "▸" : "▾"} ${node.data.label}${collapsed ? ` · ${hiddenChildCount} items` : ""}`,
                  12,
                  c.muted,
                ),
              }),
            service: ({ node, isSelected: selected }) =>
              Container({
                padding: EdgeInsets.all(13),
                decoration: new BoxDecoration({
                  color: c.card,
                  border: Border.all({
                    color: selected ? "#6366f1" : c.line,
                    width: selected ? 2 : 1,
                  }),
                  borderRadius: BorderRadius.circular(10),
                }),
                child: Column({
                  crossAxisAlignment: CrossAxisAlignment.start,
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    this.status(node),
                    this.text(String(node.data.label), 15),
                    this.text(
                      String(node.data.detail),
                      11,
                      node.data.status === "Degraded" ? "#dc2626" : c.muted,
                    ),
                  ],
                }),
              }),
          };
          return (
            views[args.node.type ?? "default"] ??
            views.default ??
            defaultNode
          )(args, ctx);
        },
        nodeToolbar: (args, ctx) => {
          const views: Record<
            string,
            (
              args: Parameters<typeof defaultNode>[0],
              ctx: Parameters<typeof defaultNode>[1],
            ) => import("flitterjs").Widget
          > = {
            frame: ({ node }) =>
              this.box([
                this.button(
                  node.collapsed ? "Expand group" : "Collapse group",
                  () => this.fold(node.id),
                ),
              ]),
          };
          const view = views[args.node.type ?? "default"] ?? views.default;
          return view
            ? view(args as Parameters<typeof defaultNode>[0], ctx)
            : SizedBox.shrink();
        },
      },
      nodeOptions: {
        frame: { group: true, handles: [] },
        service: {
          handles: [
            { type: "target", position: "left" },
            { type: "source", position: "right" },
          ],
        },
      },
      getContextMenuItems: (args) => [
        {
          label: "New group from selection",
          onSelect: () => this.newGroup(args.position),
        },
        { label: "Undo", onSelect: () => this.flow.history.undo() },
      ],
    });
  }
  build(): Widget {
    const n = this.initialized
      ? this.flow.getNode(this.selected ?? "")
      : this.nodes.find((n) => n.id === this.selected);
    const c = this.colors;
    return LayoutBuilder({
      builder: (_context, size) =>
        Column({
          children: [
            Container({
              height: 54,
              color: c.card,
              padding: EdgeInsets.symmetric({ horizontal: 14 }),
              child: Row({
                children: [
                  Expanded({
                    child: this.text(
                      size.maxWidth >= 540
                        ? "Commerce / Production"
                        : "Production",
                      13,
                    ),
                  }),
                  this.button(
                    this.references ? "Hide references" : "Show references",
                    () => {
                      this.setState(() => {
                        this.references = !this.references;
                      });
                      this.flow.setEdges((es) =>
                        es.map((e) => ({ ...e, hidden: !this.references })),
                      );
                    },
                  ),
                  ...(size.maxWidth >= 600
                    ? [this.button("Fold storage", () => this.fold("storage"))]
                    : []),
                ],
              }),
            }),
            Expanded({
              child: Row({
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  Expanded({ child: (this.diagram ??= this.createDiagram()) }),
                  ...(size.maxWidth >= 800 && n
                    ? [
                        Container({ width: 1, color: c.line }),
                        Container({
                          key: "diagram-status",
                          width: 220,
                          color: c.card,
                          padding: EdgeInsets.all(16),
                          child: Column({
                            crossAxisAlignment: CrossAxisAlignment.stretch,
                            children: [
                              SizedBox({ height: 20 }),
                              this.text(String(n.data.label), 17),
                              SizedBox({ height: 8 }),
                              this.text(
                                String(n.data.status),
                                12,
                                String(n.data.color),
                              ),
                              SizedBox({ height: 30 }),
                              SizedBox({ height: 7 }),
                              this.text(String(n.data.region), 14),
                              SizedBox({ height: 22 }),
                              SizedBox({ height: 7 }),
                              this.text(String(n.data.deploy), 14),
                              SizedBox({ height: 22 }),
                              SizedBox({ height: 7 }),
                              this.text(String(n.data.detail), 14),
                              Expanded({ child: SizedBox.shrink() }),
                              this.button("Redeploy", () => {
                                if (!this.flow.getNode(n.id)) return;
                                this.flow.updateNodeData(n.id, {
                                  status: "Healthy",
                                  detail: "Deployment complete",
                                  color: "#16a34a",
                                  deploy: "Just now · 91a3c72",
                                });
                                this.setState();
                              }),
                              SizedBox({ height: 8 }),
                            ],
                          }),
                        }),
                      ]
                    : []),
                ],
              }),
            }),
          ],
        }),
    });
  }
  dispose() {
    this.flow.dispose();
    super.dispose();
  }
}
export default function DeploymentCanvas(theme: Theme = "light"): Widget {
  return new Deployment(theme);
}