Basic Sankey

export interface BasicFlowNode {
  readonly id: string
  readonly label: string
}

export interface BasicFlowLink {
  readonly source: string
  readonly target: string
  readonly value: number
}

export interface BasicSankeyData {
  readonly nodes: readonly BasicFlowNode[]
  readonly links: readonly BasicFlowLink[]
}

export const basicFlowNodes = [
  { id: 'input', label: 'Input' },
  { id: 'path-a', label: 'Path A' },
  { id: 'path-b', label: 'Path B' },
  { id: 'output', label: 'Output' },
] as const satisfies readonly BasicFlowNode[]

const pathAValues = [6, 7, 5, 3, 4] as const

export function basicSankeyData(revision: number): BasicSankeyData {
  const pathA =
    pathAValues[Math.abs(Math.trunc(revision)) % pathAValues.length] ??
    pathAValues[0]
  const pathB = 10 - pathA

  return {
    nodes: basicFlowNodes,
    links: [
      { source: 'input', target: 'path-a', value: pathA },
      { source: 'input', target: 'path-b', value: pathB },
      { source: 'path-a', target: 'output', value: pathA },
      { source: 'path-b', target: 'output', value: pathB },
    ],
  }
}

import { d3Curve, defineChart, link, rect, text } from '@tanstack/charts'
import { sankeyDiagram } from '@tanstack/charts/network/sankey'
import { curveBumpX } from 'd3-shape'
import { basicSankeyData } from './model'
import { tanstackCase } from '../../shared/mount'
import type { SankeyLink, SankeyNode } from '@tanstack/charts/network/sankey'
import type { ConformanceInput } from '../../types'
import type { BasicFlowLink, BasicFlowNode } from './model'

export type BasicSankeyNodeRow = SankeyNode<
  BasicFlowNode,
  BasicFlowLink,
  string
>
export type BasicSankeyLinkRow = SankeyLink<
  BasicFlowNode,
  BasicFlowLink,
  string
>
export type BasicSankeyDatum = BasicSankeyNodeRow | BasicSankeyLinkRow

export const basicSankeyDefinition = (input: ConformanceInput) => {
  const { nodes, links } = basicSankeyData(input.revision)

  return defineChart({
    marks: [
      sankeyDiagram({
        id: 'basic-sankey',
        nodes,
        links,
        nodeKey: 'id',
        source: 'source',
        target: 'target',
        value: 'value',
        align: 'left',
        nodeWidth: ({ width }) => clamp(width * 0.025, 10, 18),
        nodePadding: ({ height }) => clamp(height * 0.12, 18, 38),
        inset: ({ width, height }) => ({
          left: clamp(width * 0.14, 48, 82),
          right: clamp(width * 0.14, 48, 82),
          top: clamp(height * 0.1, 18, 32),
          bottom: clamp(height * 0.1, 18, 32),
        }),
        iterations: 16,
        marks: ({ chart, nodes: sankeyNodes, links: sankeyLinks }) => {
          const labelFontSize = clamp(chart.width * 0.018, 8, 12)
          const labelOffset = clamp(chart.width * 0.012, 4, 8)
          return [
            link(sankeyLinks, {
              id: 'links',
              x1: 'x1',
              y1: 'y1',
              x2: 'x2',
              y2: 'y2',
              key: 'key',
              stroke: 'currentColor',
              strokeOpacity: 0.35,
              strokeWidth: (flow) => Math.max(1, flow.width),
              lineCap: 'butt',
              curve: d3Curve(curveBumpX),
            }),
            rect(sankeyNodes, {
              id: 'nodes',
              x1: 'x0',
              x2: 'x1',
              y1: 'y0',
              y2: 'y1',
              key: 'key',
              fill: 'currentColor',
              fillOpacity: 0.72,
              inset: 0,
            }),
            text(sankeyNodes, {
              id: 'labels',
              x: (node) =>
                node.depth === 0
                  ? node.x0 - labelOffset
                  : node.x1 + labelOffset,
              y: (node) => node.y,
              text: (node) => node.data.label,
              key: 'key',
              anchor: (node) => (node.depth === 0 ? 'end' : 'start'),
              fill: 'currentColor',
              fontSize: labelFontSize,
              fontWeight: 650,
            }),
          ] as const
        },
      }),
    ],
    guides: false,
    margin: 0,
  })
}

function clamp(value: number, minimum: number, maximum: number) {
  return Math.min(maximum, Math.max(minimum, value))
}

export const catalogCase = tanstackCase(basicSankeyDefinition, 'Basic Sankey', {
  format: ({ datum }) =>
    datum.kind === 'node'
      ? `${datum.data.label} · ${datum.value}`
      : `${datum.sourceNode.data.label} → ${datum.targetNode.data.label} · ${datum.value}`,
})

export const mount = catalogCase.mount

import {
  defineChart,
  isResponsiveChartDefinition,
  mountChart,
} from '@tanstack/charts'
import { tooltip } from '@tanstack/charts/tooltip'
import type {
  DomChartDefinition,
  ChartDefinitionOptions,
  ChartValue,
  ChartTooltipOptions,
} from '@tanstack/charts'
import type {
  ConformanceHandle,
  ConformanceInput,
  ConformanceMount,
} from '../types'

export function mountObservablePlot(
  container: HTMLElement,
  input: ConformanceInput,
  render: (input: ConformanceInput) => HTMLElement | SVGSVGElement,
): ConformanceHandle {
  let element = render(input)
  container.append(element)

  return {
    update(nextInput) {
      const nextElement = render(nextInput)
      element.replaceWith(nextElement)
      element = nextElement
    },
    destroy() {
      element.remove()
    },
  }
}

export function tanstackMount<
  TDatum,
  TXValue extends ChartValue = ChartValue,
  TYValue extends ChartValue = ChartValue,
>(
  createDefinition: (
    input: ConformanceInput,
  ) => DomChartDefinition<TDatum, TXValue, TYValue>,
  ariaLabel: string,
  interactiveTooltip: true | ChartTooltipOptions<TDatum> = true,
): TanStackConformanceCase<TDatum, TXValue, TYValue> {
  const mount: ConformanceMount = (container, input) => {
    const options = {
      definition: withConformanceBehavior(
        createDefinition(input),
        input,
        interactiveTooltip,
      ),
      width: input.width,
      height: input.height,
      ariaLabel,
    } as const
    const host = mountChart(container, options)

    return {
      update(nextInput) {
        host.update({
          ...options,
          definition: withConformanceBehavior(
            createDefinition(nextInput),
            nextInput,
            interactiveTooltip,
          ),
          width: nextInput.width,
          height: nextInput.height,
        })
      },
      destroy() {
        host.destroy()
      },
    }
  }

  const catalogCase = Object.assign(mount, {
    createDefinition,
    ariaLabel,
    interactiveTooltip,
  })

  return Object.assign(catalogCase, { mount: catalogCase })
}

export interface TanStackConformanceCase<
  TDatum,
  TXValue extends ChartValue = ChartValue,
  TYValue extends ChartValue = ChartValue,
> {
  (container: HTMLElement, input: ConformanceInput): ConformanceHandle
  createDefinition: (
    input: ConformanceInput,
  ) => DomChartDefinition<TDatum, TXValue, TYValue>
  ariaLabel: string
  interactiveTooltip: true | ChartTooltipOptions<TDatum>
  mount: ConformanceMount
}

export function tanstackCase<
  TDatum,
  TXValue extends ChartValue = ChartValue,
  TYValue extends ChartValue = ChartValue,
>(
  createDefinition: (
    input: ConformanceInput,
  ) => DomChartDefinition<TDatum, TXValue, TYValue>,
  ariaLabel: string,
  interactiveTooltip: true | ChartTooltipOptions<TDatum> = true,
): TanStackConformanceCase<TDatum, TXValue, TYValue> {
  return tanstackMount(createDefinition, ariaLabel, interactiveTooltip)
}

export function withConformanceBehavior<
  TDatum,
  TXValue extends ChartValue,
  TYValue extends ChartValue,
>(
  definition: DomChartDefinition<TDatum, TXValue, TYValue>,
  input: ConformanceInput,
  interactiveTooltip: true | ChartTooltipOptions<TDatum>,
): DomChartDefinition<TDatum, TXValue, TYValue> {
  const behavior: ChartDefinitionOptions<TDatum, TXValue, TYValue, 'dom'> = {
    svgAnimation: false,
    ...(input.interactive === true ? {} : { focus: false }),
    keyboard: input.interactive === true,
    tooltip:
      input.interactive !== true
        ? false
        : interactiveTooltip === true
          ? tooltip
          : { use: tooltip, ...interactiveTooltip },
  }

  if (isResponsiveChartDefinition(definition)) {
    return defineChart(definition, behavior)
  }
  return defineChart(definition, behavior)
}

export type ConformanceReferenceRenderer =
  'observable-plot' | 'recharts' | 'echarts'

export type ConformanceRenderer = ConformanceReferenceRenderer | 'tanstack'

export type ConformanceSupport = 'native' | 'composed' | 'gap' | 'deferred'

export type ConformanceGeometryRole =
  | 'arc'
  | 'area'
  | 'arrow'
  | 'bar'
  | 'cell'
  | 'contour'
  | 'delaunay'
  | 'density'
  | 'dot'
  | 'frame'
  | 'geo'
  | 'hexagon'
  | 'line'
  | 'link'
  | 'rect'
  | 'radar'
  | 'regression'
  | 'rule'
  | 'text'
  | 'tick'
  | 'vector'
  | 'voronoi'
  | 'waffle'

export interface ConformanceInput {
  width: number
  height: number
  revision: number
  interactive?: boolean
  /** Use lower-detail geometry suited to compact catalog cards. */
  preview?: boolean
  /** True only for semantic browser scenarios, not catalog or visual mounts. */
  behavior?: boolean
}

export interface ConformanceHandle {
  update: (input: ConformanceInput) => void
  driver?: ConformanceTestDriver
  destroy: () => void
}

export type ConformanceMount = (
  container: HTMLElement,
  input: ConformanceInput,
) => ConformanceHandle

export interface ConformanceGeometryExpectation {
  id?: string
  view?: string
  role: ConformanceGeometryRole
  count: number
  maxCount?: number
  rendererRoles?: Partial<Record<ConformanceRenderer, ConformanceGeometryRole>>
}

export type ConformanceAxis = 'x' | 'y' | 'fx' | 'fy'

export interface ConformanceGuideExpectation {
  id: string
  axis:
    | ConformanceAxis
    | (Record<'tanstack', ConformanceAxis> &
        Partial<Record<ConformanceReferenceRenderer, ConformanceAxis>>)
  sequence?: readonly string[]
  maxRepeat?: number
}

export type ConformanceJsonValue =
  | null
  | boolean
  | number
  | string
  | readonly ConformanceJsonValue[]
  | ConformanceJsonObject

export interface ConformanceJsonObject {
  readonly [key: string]: ConformanceJsonValue
}

export interface ConformanceTarget {
  view?: string
  anchor: string
}

export type ConformanceRenderedTarget =
  | {
      selector: string
      index?: number
      role?: never
      name?: never
      exact?: never
      root?: never
      page?: never
    }
  | {
      role: string
      name?: string
      exact?: boolean
      index?: number
      selector?: never
      root?: never
      page?: never
    }
  | {
      root: true
      selector?: never
      role?: never
      name?: never
      exact?: never
      index?: never
      page?: never
    }
  | {
      page: true
      selector?: never
      role?: never
      name?: never
      exact?: never
      index?: never
      root?: never
    }

export interface ConformanceResolvedTarget {
  /** Viewport-relative client coordinate used by Playwright mouse input. */
  x: number
  /** Viewport-relative client coordinate used by Playwright mouse input. */
  y: number
  /** Optional element to focus before a real Playwright keyboard action. */
  focusElement?: HTMLElement | SVGElement
}

export interface ConformanceGeometryQuery {
  view?: string
  role: ConformanceGeometryRole
}

export interface ConformanceGeometrySample {
  /** Viewport-relative client box, matching getBoundingClientRect coordinates. */
  x: number
  y: number
  width: number
  height: number
  paint?: string
}

export interface ConformanceTestDriver {
  /**
   * Benchmark-only semantic bridge. Case metadata names anchors; each renderer
   * resolves those anchors without exposing renderer-specific selectors.
   */
  resolveTarget: (target: ConformanceTarget) => ConformanceResolvedTarget | null
  readState: () => ConformanceJsonObject
  geometry?: (
    query: ConformanceGeometryQuery,
  ) => readonly ConformanceGeometrySample[]
  /**
   * Viewport-relative logical view bounds. Multi-grid renderers may expose
   * independent views without separate DOM roots.
   */
  viewBounds?: (view?: string) => ConformanceGeometrySample | null
  settle?: () => void | Promise<void>
}

export type ConformanceStateAssertion =
  | {
      path: string
      equals: ConformanceJsonValue
    }
  | {
      path: string
      includes: ConformanceJsonValue
    }
  | {
      path: string
      approx: number
      tolerance: number
    }

type ConformanceRenderedStringMatcher =
  | {
      equals: string | null
      includes?: never
    }
  | {
      includes: string
      equals?: never
    }

type ConformanceRenderedNumberMatcher =
  | {
      equals: number
      approx?: never
      tolerance?: never
      atLeast?: never
      atMost?: never
    }
  | {
      approx: number
      tolerance: number
      equals?: never
      atLeast?: never
      atMost?: never
    }
  | {
      atLeast: number
      equals?: never
      approx?: never
      tolerance?: never
      atMost?: never
    }
  | {
      atMost: number
      equals?: never
      approx?: never
      tolerance?: never
      atLeast?: never
    }

export type ConformanceRenderedAssertion =
  | ({
      target: ConformanceRenderedTarget
      property: 'count'
    } & ConformanceRenderedNumberMatcher)
  | ({
      target: ConformanceRenderedTarget
      property: 'text'
    } & ConformanceRenderedStringMatcher)
  | ({
      target: ConformanceRenderedTarget
      property: 'attribute'
      attribute: string
    } & ConformanceRenderedStringMatcher)
  | {
      target: ConformanceRenderedTarget
      property: 'visible' | 'focused'
      equals: boolean
    }
  | ({
      target: ConformanceRenderedTarget
      property:
        | 'scrollLeft'
        | 'scrollTop'
        | 'scrollWidth'
        | 'scrollHeight'
        | 'clientWidth'
        | 'clientHeight'
        | 'width'
        | 'height'
    } & ConformanceRenderedNumberMatcher)
  | {
      target: ConformanceRenderedTarget
      property: 'contained'
      within?: ConformanceRenderedTarget
      tolerance?: number
      equals: true
    }

export type ConformanceInteractionStep =
  | {
      type: 'pointerMove'
      target: ConformanceTarget
      steps?: number
    }
  | {
      type: 'pointerDown'
      target: ConformanceTarget
    }
  | {
      type: 'pointerUp'
      target: ConformanceTarget
    }
  | {
      type: 'pointerCancel'
    }
  | {
      type: 'pointerLeave'
      view?: string
    }
  | {
      type: 'update'
      revision: number
    }
  | {
      type: 'click'
      target: ConformanceTarget
    }
  | {
      type: 'key'
      key: string
      target?: ConformanceTarget
    }
  | {
      type: 'drag'
      from: ConformanceTarget
      to: ConformanceTarget
      steps?: number
    }
  | {
      type: 'wheel'
      target: ConformanceTarget
      deltaX?: number
      deltaY?: number
      steps?: number
      deltaMode?: 'pixel' | 'line' | 'page'
    }
  | {
      type: 'touchTap'
      target: ConformanceTarget
    }
  | {
      type: 'touchDrag'
      from: ConformanceTarget
      to: ConformanceTarget
      steps?: number
      cancel?: boolean
    }
  | {
      type: 'wait'
      durationMs: number
    }
  | {
      type: 'assert'
      assertions: readonly ConformanceStateAssertion[]
    }
  | {
      type: 'assertRendered'
      assertions: readonly ConformanceRenderedAssertion[]
    }
  | {
      type: 'screenshot'
      name: string
      view?: string
    }

export interface ConformanceInteractionScenario {
  id: string
  steps: readonly ConformanceInteractionStep[]
}

export interface ConformanceCaseMeta {
  schemaVersion: 1
  referenceRenderer?: ConformanceReferenceRenderer
  order: number
  id: string
  title: string
  family: string
  intent: string
  support: ConformanceSupport
  features: readonly string[]
  geometry: readonly ConformanceGeometryExpectation[]
  minimumGeometrySimilarity?: number
  guideAssertions?: readonly ConformanceGuideExpectation[]
  interactionScenarios?: readonly ConformanceInteractionScenario[]
  source: {
    title: string
    url: string
  }
  ai: {
    create: string
    maintain: string
  }
}

export interface ConformanceImplementationModule {
  mount: ConformanceMount
}