import { useQuery } from "@tanstack/react-query"
import { Plus, X } from "lucide-react"
import { useState } from "react"

import type { MessageInfo, WidgetDef } from "@/client"
import { DEFAULT_RANGE, RANGES } from "@/components/Common/RangePicker"
import {
  PANEL_SECTION,
  PanelTitle,
  SidePanel,
} from "@/components/Flow/SidePanel"
import { Button } from "@/components/ui/button"
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select"
import { cn } from "@/lib/utils"
import { MAX_SEGMENTS, type Segment, segmentsOf } from "./BarWidget"
import { MAX_SERIES, refreshFor } from "./ChartWidget"
import {
  CANVAS_PRESETS,
  COLUMN_CHOICES,
  canvasOf,
  columnsOf,
  type Dashboard,
} from "./DashboardView"
import { ICON_COLORS, ICON_NAMES } from "./icons"
import { messageCatalogQueryOptions } from "./queries"
import {
  acceptsDtype,
  INPUT_WIDGETS,
  type Series,
  seriesOf,
  WIDGET_LABELS,
  type WidgetKind,
  widgetIssue,
} from "./widgets"

const config = (widget: WidgetDef) =>
  (widget.config ?? {}) as Record<string, unknown>

const str = (value: unknown) => (value == null ? "" : String(value))

/** Which messages this kind of widget may be pointed at. */
function choicesFor(kind: WidgetKind, catalog: MessageInfo[]): MessageInfo[] {
  const input = INPUT_WIDGETS.has(kind)
  return catalog.filter(
    (message) =>
      acceptsDtype(kind, message.dtype) &&
      // Flows own the namespace; a control can only set what one declares.
      (!input || message.writable !== false),
  )
}

/** The picker, which records the payload type it bound along with the name. */
function MessagePicker({
  kind,
  value,
  label,
  testId,
  filter,
  onPick,
}: {
  kind: WidgetKind
  value: string
  label: string
  testId?: string
  /** What this slot takes, when the widget's own type does not decide it —
   *  a querying chart asks with one shape and draws another. */
  filter?: (message: MessageInfo) => boolean
  onPick: (message: string, dtype: string) => void
}) {
  const { data } = useQuery(messageCatalogQueryOptions())
  const catalog = data?.data ?? []
  const choices = filter ? catalog.filter(filter) : choicesFor(kind, catalog)

  return (
    <div className="grid gap-1.5">
      <Label className="text-sm font-normal">{label}</Label>
      <Select
        value={value}
        onValueChange={(next) =>
          onPick(
            next,
            choices.find((message) => message.name === next)?.dtype ?? "",
          )
        }
      >
        <SelectTrigger data-testid={testId}>
          <SelectValue placeholder="Pick a message" />
        </SelectTrigger>
        <SelectContent>
          {choices.map((message) => (
            <SelectItem key={message.name} value={message.name}>
              {message.name}
            </SelectItem>
          ))}
        </SelectContent>
      </Select>
    </div>
  )
}

/**
 * Where a chart's lines come from: what the engine kept, or what it asks for.
 *
 * The one segmented shape — a single border pill, transparent segments,
 * bg-accent on the selected one (root DESIGN-GUIDELINES.md).
 */
function ModePicker({
  value,
  onChange,
}: {
  value: "live" | "query"
  onChange: (mode: "live" | "query") => void
}) {
  return (
    <fieldset
      data-testid="chart-source"
      className="flex w-fit items-center gap-1 rounded-full border border-border p-1"
    >
      <legend className="sr-only">Where the chart's data comes from</legend>
      {(
        [
          ["live", "Live"],
          ["query", "Query"],
        ] as const
      ).map(([mode, label]) => (
        <button
          key={mode}
          type="button"
          aria-pressed={value === mode}
          onClick={() => onChange(mode)}
          className={cn(
            "rounded-full px-2.5 py-1 text-xs transition-colors",
            value === mode
              ? "bg-accent text-accent-foreground"
              : "text-muted-foreground hover:bg-accent/50",
          )}
        >
          {label}
        </button>
      ))}
    </fieldset>
  )
}

/** Which chrome an input wears, in the same segmented shape as the mode. */
function StylePicker({
  value,
  options,
  onChange,
}: {
  value: string
  options: readonly (readonly [string, string])[]
  onChange: (style: string) => void
}) {
  return (
    <fieldset
      data-testid="widget-style"
      className="flex w-fit items-center gap-1 rounded-full border border-border p-1"
    >
      <legend className="sr-only">How this control is drawn</legend>
      {options.map(([style, label]) => (
        <button
          key={style}
          type="button"
          aria-pressed={value === style}
          onClick={() => onChange(style)}
          className={cn(
            "rounded-full px-2.5 py-1 text-xs transition-colors",
            value === style
              ? "bg-accent text-accent-foreground"
              : "text-muted-foreground hover:bg-accent/50",
          )}
        >
          {label}
        </button>
      ))}
    </fieldset>
  )
}

/** What a text field was meant to send: a bool, a number, or the text itself. */
function coerce(raw: string): unknown {
  const asNumber = Number(raw)
  if (raw === "true" || raw === "false") return raw === "true"
  return raw !== "" && Number.isFinite(asNumber) ? asNumber : raw
}

/**
 * What one widget shows or does.
 *
 * The same floating panel the flow editor uses for a node, so the two editors
 * read as one surface.
 */
export function WidgetPanel({
  widget,
  onChange,
  onDelete,
  onClose,
}: {
  widget: WidgetDef | null
  onChange: (changes: Partial<WidgetDef>) => void
  onDelete: () => void
  onClose: () => void
}) {
  if (!widget) return null
  const cfg = config(widget)
  const isInput = INPUT_WIDGETS.has(widget.type)
  const issue = widgetIssue(widget)

  const set = (changes: Record<string, unknown>) =>
    onChange({ config: { ...cfg, ...changes } })

  const series = seriesOf(widget)
  const setSeries = (next: Series[]) => set({ series: next })
  // A bar's nested readings. An empty row stands in for none, so an unnested
  // bar still offers the picker rather than only a button.
  const segments = segmentsOf(widget)
  const rows: Segment[] = segments.length ? segments : [{}]
  // Always written as a list; `inner_dtype` belonged to the single binding a
  // bar carried before it stacked, and goes with it.
  const setSegments = (next: Segment[]) =>
    set({ inner: next, inner_dtype: undefined })
  // The icon widget's mapping. Position is the row's identity, as with series.
  const rules = (cfg.rules ?? []) as {
    at?: unknown
    icon?: string
    color?: string
    label?: string
  }[]
  const setRules = (next: typeof rules) => set({ rules: next })
  // Nothing wrote these until now, so a dropdown's choices were uneditable.
  const options = (cfg.options ?? []) as { label?: string; value?: unknown }[]
  const setOptions = (next: typeof options) => set({ options: next })
  const querying = cfg.source === "query"
  // What this chart would refresh at with nothing configured. The viewer can
  // pick another window on the widget, which moves it.
  const paced = refreshFor(
    RANGES.find((range) => range.hours * 3600 === Number(cfg.range_s)) ??
      DEFAULT_RANGE,
    0,
  )

  return (
    <SidePanel
      open={Boolean(widget)}
      label="Widget settings"
      testId="widget-panel"
      bodyKey={widget.id}
      onClose={onClose}
      header={
        <PanelTitle
          value={widget.title ?? ""}
          placeholder={WIDGET_LABELS[widget.type]}
          label="Widget title"
          onConfirm={(title) => onChange({ title })}
        />
      }
      footer={
        <Button
          variant="ghost"
          size="sm"
          className="text-destructive hover:text-destructive"
          onClick={onDelete}
          data-testid="delete-widget"
        >
          Remove widget
        </Button>
      }
    >
      <div className="grid gap-5 p-4" data-testid="widget-settings">
        <div className="grid gap-2">
          <span className={PANEL_SECTION}>{WIDGET_LABELS[widget.type]}</span>
          {issue ? (
            <p className="text-sm text-destructive" data-testid="widget-error">
              {issue}
            </p>
          ) : null}

          {widget.type === "markdown" ? (
            <div className="grid gap-1.5">
              <Label className="text-sm font-normal">Text</Label>
              <Input
                value={str(cfg.content)}
                placeholder="# Heading"
                onChange={(event) => set({ content: event.target.value })}
              />
            </div>
          ) : widget.type === "chart" ? (
            <div className="grid gap-3">
              <ModePicker
                value={querying ? "query" : "live"}
                onChange={(source) => set({ source })}
              />
              {querying ? (
                <div className="grid gap-2">
                  <MessagePicker
                    kind="chart"
                    value={str(cfg.request)}
                    label="Asks"
                    testId="widget-request"
                    filter={(message) =>
                      message.dtype === "record" && message.writable !== false
                    }
                    onPick={(request, request_dtype) =>
                      set({ request, request_dtype })
                    }
                  />
                  <MessagePicker
                    kind="chart"
                    value={str(cfg.message)}
                    label="Draws"
                    testId="widget-message"
                    filter={(message) => message.dtype === "series"}
                    onPick={(message, dtype) => set({ message, dtype })}
                  />
                </div>
              ) : (
                <div className="grid gap-2">
                  {series.map((entry, index) => (
                    <div
                      // Position is the only identity a series row has.
                      key={`series-${index}`}
                      className="flex items-end gap-1.5"
                    >
                      <div className="min-w-0 flex-1">
                        <MessagePicker
                          kind="chart"
                          value={entry.message ?? ""}
                          label={index === 0 ? "Draws" : ""}
                          testId={index === 0 ? "widget-message" : undefined}
                          onPick={(message, dtype) =>
                            setSeries(
                              series.map((other, at) =>
                                at === index
                                  ? { ...other, message, dtype }
                                  : other,
                              ),
                            )
                          }
                        />
                      </div>
                      <Input
                        className="w-28"
                        value={entry.label ?? ""}
                        placeholder="Label"
                        aria-label="Series label"
                        onChange={(event) =>
                          setSeries(
                            series.map((other, at) =>
                              at === index
                                ? { ...other, label: event.target.value }
                                : other,
                            ),
                          )
                        }
                      />
                      <Button
                        variant="ghost"
                        size="icon-sm"
                        className="text-muted-foreground"
                        aria-label="Remove series"
                        onClick={() =>
                          setSeries(series.filter((_, at) => at !== index))
                        }
                      >
                        <X />
                      </Button>
                    </div>
                  ))}
                  {series.length < MAX_SERIES ? (
                    <Button
                      variant="outline"
                      size="sm"
                      className="h-8 justify-self-start"
                      onClick={() => setSeries([...series, {}])}
                      data-testid="add-series"
                    >
                      <Plus />
                      Add series
                    </Button>
                  ) : null}
                </div>
              )}
            </div>
          ) : // A clock reads the wall; a picker would bind a message nothing reads.
          widget.type === "clock" ? null : (
            <MessagePicker
              kind={widget.type}
              value={str(cfg[isInput ? "target" : "message"])}
              label={isInput ? "Publishes to" : "Shows"}
              testId="widget-message"
              onPick={(message, dtype) =>
                set({ [isInput ? "target" : "message"]: message, dtype })
              }
            />
          )}
        </div>

        {widget.type === "bar" ? (
          <div className="grid gap-2">
            {rows.map((segment, index) => (
              <div
                // Position is the only identity a segment row has, as with series.
                key={`segment-${index}`}
                className="flex items-end gap-1.5"
              >
                <div className="min-w-0 flex-1">
                  <MessagePicker
                    kind="bar"
                    value={segment.message ?? ""}
                    label={index === 0 ? "Nested bar" : ""}
                    testId={index === 0 ? "widget-inner" : undefined}
                    onPick={(message, dtype) =>
                      setSegments(
                        rows.map((other, at) =>
                          at === index ? { ...other, message, dtype } : other,
                        ),
                      )
                    }
                  />
                </div>
                <Button
                  variant="ghost"
                  size="icon-sm"
                  className="text-muted-foreground"
                  aria-label="Remove segment"
                  onClick={() =>
                    setSegments(rows.filter((_, at) => at !== index))
                  }
                >
                  <X />
                </Button>
              </div>
            ))}
            {rows.length < MAX_SEGMENTS ? (
              <Button
                variant="outline"
                size="sm"
                className="h-8 justify-self-start"
                onClick={() => setSegments([...rows, {}])}
                data-testid="add-segment"
              >
                <Plus />
                Add segment
              </Button>
            ) : null}
          </div>
        ) : null}

        {widget.type === "chart" && !querying ? (
          <div className="grid gap-1.5">
            <Label className="text-sm font-normal">Points kept</Label>
            <Input
              type="number"
              value={str(
                (cfg.history as { points?: number } | undefined)?.points ?? 300,
              )}
              onChange={(event) =>
                set({ history: { points: Number(event.target.value) || 0 } })
              }
            />
            <p className="text-xs text-muted-foreground">
              How much past the engine keeps for these messages.
            </p>
          </div>
        ) : null}

        {widget.type === "chart" && querying ? (
          <>
            <div className="grid gap-1.5">
              <Label className="text-sm font-normal">Refresh, seconds</Label>
              <Input
                type="number"
                min={paced}
                placeholder={str(paced)}
                value={str(cfg.refresh_s ?? "")}
                onChange={(event) =>
                  set({
                    refresh_s:
                      event.target.value === ""
                        ? undefined
                        : Number(event.target.value),
                  })
                }
              />
              <p className="text-xs text-muted-foreground">
                Empty follows the window — {paced} seconds at this range, since
                nothing changes until the bucket closes. A slower one is kept, a
                faster one only asks for the same picture twice.
              </p>
            </div>
            <div className="grid gap-1.5">
              <Label className="text-sm font-normal">Range shown first</Label>
              <Select
                value={str(cfg.range_s ?? DEFAULT_RANGE.hours * 3600)}
                onValueChange={(value) => set({ range_s: Number(value) })}
              >
                <SelectTrigger>
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  {RANGES.map((range) => (
                    <SelectItem
                      key={range.label}
                      value={String(range.hours * 3600)}
                    >
                      {range.label}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
              <p className="text-xs text-muted-foreground">
                A viewer can pick another on the widget itself.
              </p>
            </div>
          </>
        ) : null}

        {widget.type === "agenda" || widget.type === "forecast" ? (
          <div className="grid gap-1.5">
            <Label className="text-sm font-normal">Items shown</Label>
            <Input
              type="number"
              min={1}
              value={str(cfg.count ?? 5)}
              onChange={(event) =>
                set({ count: Number(event.target.value) || 0 })
              }
            />
          </div>
        ) : null}

        {widget.type === "chart" ? (
          <div className="flex gap-2">
            <div className="grid flex-1 gap-1.5">
              <Label className="text-sm font-normal">Y minimum</Label>
              <Input
                type="number"
                value={str(cfg.y_min ?? "")}
                placeholder="auto"
                onChange={(event) =>
                  set({
                    y_min:
                      event.target.value === ""
                        ? undefined
                        : Number(event.target.value),
                  })
                }
              />
            </div>
            <div className="grid flex-1 gap-1.5">
              <Label className="text-sm font-normal">Y maximum</Label>
              <Input
                type="number"
                value={str(cfg.y_max ?? "")}
                placeholder="auto"
                onChange={(event) =>
                  set({
                    y_max:
                      event.target.value === ""
                        ? undefined
                        : Number(event.target.value),
                  })
                }
              />
            </div>
            <div className="grid flex-1 gap-1.5">
              <Label className="text-sm font-normal">Y axis title</Label>
              <Input
                value={str(cfg.y_label)}
                placeholder="kW"
                onChange={(event) => set({ y_label: event.target.value })}
              />
            </div>
          </div>
        ) : null}

        {widget.type === "stat" ||
        widget.type === "gauge" ||
        widget.type === "chart" ||
        widget.type === "bar" ||
        widget.type === "slider" ? (
          <div className="grid gap-1.5">
            <Label className="text-sm font-normal">Unit</Label>
            <Input
              value={str(cfg.unit)}
              placeholder="°C"
              onChange={(event) => set({ unit: event.target.value })}
            />
          </div>
        ) : null}

        {widget.type === "gauge" ||
        widget.type === "slider" ||
        widget.type === "bar" ? (
          <div className="flex gap-2">
            <div className="grid flex-1 gap-1.5">
              <Label className="text-sm font-normal">Minimum</Label>
              <Input
                type="number"
                value={str(cfg.min ?? 0)}
                onChange={(event) =>
                  set({ min: Number(event.target.value) || 0 })
                }
              />
            </div>
            <div className="grid flex-1 gap-1.5">
              <Label className="text-sm font-normal">Maximum</Label>
              <Input
                type="number"
                value={str(cfg.max ?? 100)}
                onChange={(event) =>
                  set({ max: Number(event.target.value) || 0 })
                }
              />
            </div>
            {widget.type === "slider" ? (
              <div className="grid flex-1 gap-1.5">
                <Label className="text-sm font-normal">Step</Label>
                <Input
                  type="number"
                  min={0}
                  step="any"
                  value={str(cfg.step ?? 1)}
                  onChange={(event) =>
                    set({ step: Number(event.target.value) || 1 })
                  }
                />
              </div>
            ) : null}
          </div>
        ) : null}

        {widget.type === "button" ? (
          <div className="grid gap-1.5">
            <Label className="text-sm font-normal">Sends</Label>
            <Input
              value={str(cfg.value)}
              placeholder="true"
              onChange={(event) => set({ value: coerce(event.target.value) })}
            />
          </div>
        ) : null}

        {widget.type === "dropdown" ? (
          <div className="grid gap-2">
            <span className={PANEL_SECTION}>Options</span>
            {options.map((option, index) => (
              <div
                // Position is the only identity an option row has.
                key={`option-${index}`}
                className="flex items-end gap-1.5"
              >
                <Input
                  className="min-w-0 flex-1"
                  value={str(option.label)}
                  placeholder="Label"
                  aria-label="Option label"
                  onChange={(event) =>
                    setOptions(
                      options.map((other, at) =>
                        at === index
                          ? { ...other, label: event.target.value }
                          : other,
                      ),
                    )
                  }
                />
                <Input
                  className="w-28"
                  value={str(option.value)}
                  placeholder="Value"
                  aria-label="Option value"
                  onChange={(event) =>
                    setOptions(
                      options.map((other, at) =>
                        at === index
                          ? { ...other, value: coerce(event.target.value) }
                          : other,
                      ),
                    )
                  }
                />
                <Button
                  variant="ghost"
                  size="icon-sm"
                  className="text-muted-foreground"
                  aria-label="Remove option"
                  onClick={() =>
                    setOptions(options.filter((_, at) => at !== index))
                  }
                >
                  <X />
                </Button>
              </div>
            ))}
            <Button
              variant="outline"
              size="sm"
              className="h-8 justify-self-start"
              onClick={() => setOptions([...options, {}])}
              data-testid="add-option"
            >
              <Plus />
              Add option
            </Button>
          </div>
        ) : null}

        {widget.type === "icon" ? (
          <div className="grid gap-2">
            <span className={PANEL_SECTION}>Mapping</span>
            {rules.map((rule, index) => (
              <div
                // Position is the only identity a rule row has.
                key={`rule-${index}`}
                className="flex items-end gap-1.5"
              >
                <Input
                  className="w-20"
                  value={str(rule.at)}
                  placeholder="Value"
                  aria-label="Rule value"
                  onChange={(event) =>
                    setRules(
                      rules.map((other, at) =>
                        at === index
                          ? { ...other, at: coerce(event.target.value) }
                          : other,
                      ),
                    )
                  }
                />
                <Select
                  value={rule.icon ?? ""}
                  onValueChange={(icon) =>
                    setRules(
                      rules.map((other, at) =>
                        at === index ? { ...other, icon } : other,
                      ),
                    )
                  }
                >
                  <SelectTrigger
                    className="min-w-0 flex-1"
                    aria-label="Rule icon"
                  >
                    <SelectValue placeholder="Icon" />
                  </SelectTrigger>
                  <SelectContent>
                    {ICON_NAMES.map((name) => (
                      <SelectItem key={name} value={name}>
                        {name}
                      </SelectItem>
                    ))}
                  </SelectContent>
                </Select>
                <Select
                  value={rule.color ?? "default"}
                  onValueChange={(color) =>
                    setRules(
                      rules.map((other, at) =>
                        at === index ? { ...other, color } : other,
                      ),
                    )
                  }
                >
                  <SelectTrigger className="w-28" aria-label="Rule colour">
                    <SelectValue />
                  </SelectTrigger>
                  <SelectContent>
                    {Object.keys(ICON_COLORS).map((name) => (
                      <SelectItem key={name} value={name}>
                        {name}
                      </SelectItem>
                    ))}
                  </SelectContent>
                </Select>
                <Button
                  variant="ghost"
                  size="icon-sm"
                  className="text-muted-foreground"
                  aria-label="Remove rule"
                  onClick={() =>
                    setRules(rules.filter((_, at) => at !== index))
                  }
                >
                  <X />
                </Button>
              </div>
            ))}
            <Button
              variant="outline"
              size="sm"
              className="h-8 justify-self-start"
              onClick={() => setRules([...rules, {}])}
              data-testid="add-icon-rule"
            >
              <Plus />
              Add value
            </Button>
            <p className="text-xs text-muted-foreground">
              Rows are checked top to bottom and the first match wins. A number
              also matches anything above it, so a descending ladder reads as
              thresholds.
            </p>
            <div className="grid gap-1.5">
              <Label className="text-sm font-normal">Otherwise</Label>
              <Select
                value={str(cfg.icon)}
                onValueChange={(icon) => set({ icon })}
              >
                <SelectTrigger>
                  <SelectValue placeholder="Nothing" />
                </SelectTrigger>
                <SelectContent>
                  {ICON_NAMES.map((name) => (
                    <SelectItem key={name} value={name}>
                      {name}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>
          </div>
        ) : null}

        {widget.type === "switch" || widget.type === "dropdown" ? (
          <div className="grid gap-1.5">
            <Label className="text-sm font-normal">Style</Label>
            {widget.type === "switch" ? (
              <StylePicker
                value={str(cfg.style) || "track"}
                options={[
                  ["track", "Track"],
                  ["button", "Button"],
                ]}
                onChange={(style) => set({ style })}
              />
            ) : (
              <StylePicker
                value={str(cfg.style) || "list"}
                options={[
                  ["list", "List"],
                  ["segmented", "Segmented"],
                ]}
                onChange={(style) => set({ style })}
              />
            )}
          </div>
        ) : null}
      </div>
    </SidePanel>
  )
}

/** Presets are matched on their size, so a custom one simply matches none. */
const sizeKey = (size: { width: number; height: number }) =>
  `${size.width}x${size.height}`

/**
 * The dashboard's own settings, in the panel its widgets use.
 *
 * The canvas is the one that matters: a wall panel is a fixed size, and twelve
 * columns on a seven-inch screen is a different dashboard than twelve on a
 * television.
 */
export function DashboardPanel({
  open,
  dashboard,
  widgetCount,
  onChange,
  onDelete,
  onClose,
}: {
  open: boolean
  dashboard: Dashboard
  widgetCount: number
  onChange: (changes: Partial<Dashboard>) => void
  onDelete: () => void
  onClose: () => void
}) {
  const [confirmOpen, setConfirmOpen] = useState(false)
  const canvas = canvasOf(dashboard)

  return (
    <>
      <SidePanel
        open={open}
        label="Dashboard settings"
        testId="dashboard-panel"
        bodyKey={dashboard.name}
        onClose={onClose}
        header={
          <PanelTitle
            value={dashboard.title ?? ""}
            placeholder={dashboard.name}
            label="Dashboard title"
            onConfirm={(title) => onChange({ title })}
          />
        }
        footer={
          <Button
            variant="ghost"
            size="sm"
            className="text-destructive hover:text-destructive"
            onClick={() => setConfirmOpen(true)}
            data-testid="delete-dashboard"
          >
            Delete dashboard
          </Button>
        }
      >
        <div className="grid gap-5 p-4">
          <div className="grid gap-2">
            <span className={PANEL_SECTION}>Grid</span>
            <Select
              value={String(columnsOf(dashboard))}
              onValueChange={(value) => onChange({ columns: Number(value) })}
            >
              <SelectTrigger data-testid="dashboard-columns">
                <SelectValue />
              </SelectTrigger>
              <SelectContent>
                {COLUMN_CHOICES.map((count) => (
                  <SelectItem key={count} value={String(count)}>
                    {count} columns
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
            <p className="text-sm text-muted-foreground">
              How many columns wide this dashboard is laid out, so it can be
              matched to the panel it will hang on.
            </p>
          </div>

          <div className="grid gap-2">
            <span className={PANEL_SECTION}>Canvas</span>
            <Select
              value={
                CANVAS_PRESETS.some(
                  (preset) => sizeKey(preset) === sizeKey(canvas),
                )
                  ? sizeKey(canvas)
                  : ""
              }
              onValueChange={(value) => {
                const preset = CANVAS_PRESETS.find(
                  (candidate) => sizeKey(candidate) === value,
                )
                if (preset)
                  onChange({
                    canvas_width: preset.width,
                    canvas_height: preset.height,
                  })
              }}
            >
              <SelectTrigger data-testid="dashboard-canvas-size">
                <SelectValue placeholder="Custom" />
              </SelectTrigger>
              <SelectContent>
                {CANVAS_PRESETS.map((preset) => (
                  <SelectItem key={sizeKey(preset)} value={sizeKey(preset)}>
                    {preset.label} — {preset.width}×{preset.height}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
            <div className="flex gap-2">
              <Input
                type="number"
                aria-label="Canvas width"
                data-testid="canvas-width"
                value={canvas.width}
                onChange={(event) =>
                  onChange({ canvas_width: Number(event.target.value) || 0 })
                }
              />
              <Input
                type="number"
                aria-label="Canvas height"
                data-testid="canvas-height"
                value={canvas.height}
                onChange={(event) =>
                  onChange({ canvas_height: Number(event.target.value) || 0 })
                }
              />
            </div>
            <p className="text-sm text-muted-foreground">
              The panel this is drawn for, in pixels. Editing and viewing both
              scale that surface to fit, so the arrangement is the same
              everywhere.
            </p>
          </div>

          <div className="grid gap-2">
            <span className={PANEL_SECTION}>Contents</span>
            <p className="text-sm text-muted-foreground">
              <span className="font-mono">{dashboard.name}</span> —{" "}
              {widgetCount === 0
                ? "nothing on it yet."
                : `${widgetCount} widget${widgetCount === 1 ? "" : "s"}.`}
            </p>
          </div>
        </div>
      </SidePanel>

      <Dialog open={confirmOpen} onOpenChange={setConfirmOpen}>
        <DialogContent>
          <DialogHeader>
            <DialogTitle>
              Delete {dashboard.title || dashboard.name}?
            </DialogTitle>
            <DialogDescription>
              This removes the dashboard and its widgets. The flows it read from
              are untouched, and its history stays in the flow store's git
              repository.
            </DialogDescription>
          </DialogHeader>
          <DialogFooter>
            <Button variant="outline" onClick={() => setConfirmOpen(false)}>
              Keep it
            </Button>
            <Button
              variant="destructive"
              onClick={() => {
                setConfirmOpen(false)
                onDelete()
              }}
              data-testid="confirm-delete-dashboard"
            >
              Delete dashboard
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </>
  )
}