Backup gate

"use client";

import { Fragment, type ReactNode } from "react";
import {
  Database as DatabaseIcon,
  Shield as ShieldIcon,
  Clock as ClockIcon,
  Rocket as RocketIcon,
  ArrowRotateRight as RefreshIcon,
} from "@gravity-ui/icons";
import { ActionBar } from "@gravity-ui/navigation";
import {
  Accordion,
  Alert,
  Breadcrumbs,
  Button,
  Card,
  Checkbox,
  CopyToClipboard,
  DefinitionList,
  Divider,
  Icon,
  Label,
  Link,
  PlaceholderContainer,
  Progress,
  RadioGroup,
  Select,
  Slider,
  Spin,
  Stepper,
  Switch,
  Tab,
  TabList,
  TabPanel,
  TabProvider,
  Table,
  Text,
  TextInput,
  User,
} from "@/components/GravityUI/GravityUI";

type Node = {
  id: string;
  parentId: string | null;
  order: number;
  component: string;
  props: Record<string, unknown>;
};

const root = {
  "component": "Column",
  "props": {
    "align": "stretch",
    "gap": "spacious"
  }
};
const nodes: Node[] = [
  {
    "id": "header",
    "parentId": "root",
    "order": 0,
    "component": "HeroBlock",
    "props": {
      "eyebrow": "Database operations",
      "title": "Production migration runbook",
      "body": "Controlled runbook for applying migration 2026-05-24-add-customer-status-index to primary-postgres with explicit backup confirmation, validation queries, and rollback instructions.",
      "imageLabel": "DB",
      "tone": "warning",
      "labels": [
        {
          "label": "Environment",
          "value": {
            "path": "/environment"
          },
          "tone": "warning",
          "type": "default"
        },
        {
          "label": "Database",
          "value": {
            "path": "/database"
          },
          "tone": "info",
          "type": "default"
        },
        {
          "label": "Window",
          "value": {
            "path": "/estimatedWindow"
          },
          "tone": "normal",
          "type": "default"
        }
      ],
      "actions": []
    }
  },
  {
    "id": "safetyAlert",
    "parentId": "root",
    "order": 1,
    "component": "AlertBlock",
    "props": {
      "title": "Backup confirmation required",
      "message": "Do not run the migration until a restorable backup has completed and the backup identifier is recorded in the change ticket.",
      "tone": "warning"
    }
  },
  {
    "id": "overview",
    "parentId": "root",
    "order": 2,
    "component": "MetricGrid",
    "props": {
      "items": [
        {
          "label": "Migration ID",
          "value": {
            "path": "/migrationId"
          },
          "description": "Change ticket reference",
          "tone": "info",
          "icon": "database"
        },
        {
          "label": "Current gate",
          "value": "Backup pending",
          "description": "Migration is blocked until confirmed",
          "tone": "warning",
          "icon": "shield"
        },
        {
          "label": "Expected downtime",
          "value": "None",
          "description": "Run during low-traffic maintenance window",
          "tone": "success",
          "icon": "clock"
        }
      ]
    }
  },
  {
    "id": "confirmCard",
    "parentId": "root",
    "order": 3,
    "component": "Card",
    "props": {
      "theme": "warning",
      "view": "outlined",
      "padding": "comfortable"
    }
  },
  {
    "id": "confirmTitle",
    "parentId": "confirmCard",
    "order": 0,
    "component": "Text",
    "props": {
      "text": "Backup gate",
      "variant": "h3",
      "color": "primary"
    }
  },
  {
    "id": "confirmText",
    "parentId": "confirmCard",
    "order": 1,
    "component": "Text",
    "props": {
      "text": "Confirm that a full backup or point-in-time recovery marker is available before starting. Keep the backup ID and timestamp in the deployment record.",
      "variant": "body",
      "color": "secondary"
    }
  },
  {
    "id": "backupCheck",
    "parentId": "confirmCard",
    "order": 2,
    "component": "CheckBox",
    "props": {
      "label": "I confirm a successful, restorable backup exists for primary-postgres",
      "value": {
        "path": "/backupConfirmed"
      }
    }
  },
  {
    "id": "runbookSteps",
    "parentId": "root",
    "order": 4,
    "component": "StepperBlock",
    "props": {
      "title": "Runbook sequence",
      "size": "m",
      "items": [
        {
          "label": "Prepare session",
          "value": "Prepare",
          "view": "success",
          "disabled": false,
          "active": false
        },
        {
          "label": "Confirm backup",
          "value": "Backup",
          "view": "idle",
          "disabled": false,
          "active": true
        },
        {
          "label": "Run migration",
          "value": "RunMigration",
          "view": "idle",
          "disabled": true,
          "active": false
        },
        {
          "label": "Validate database",
          "value": "Validate",
          "view": "idle",
          "disabled": true,
          "active": false
        },
        {
          "label": "Rollback if needed",
          "value": "Rollback",
          "view": "idle",
          "disabled": false,
          "active": false
        }
      ]
    }
  },
  {
    "id": "preflight",
    "parentId": "root",
    "order": 5,
    "component": "Card",
    "props": {
      "theme": "normal",
      "view": "outlined",
      "padding": "comfortable"
    }
  },
  {
    "id": "preflightTitle",
    "parentId": "preflight",
    "order": 0,
    "component": "Text",
    "props": {
      "text": "Pre-flight checklist",
      "variant": "h3"
    }
  },
  {
    "id": "preflightList",
    "parentId": "preflight",
    "order": 1,
    "component": "DefinitionListBlock",
    "props": {
      "title": "Required conditions",
      "items": [
        {
          "label": "Maintenance window",
          "value": "Approved and announced to on-call, support, and application owners."
        },
        {
          "label": "Application state",
          "value": "Background jobs paused or confirmed safe for concurrent schema change."
        },
        {
          "label": "Access",
          "value": "Migration operator has psql access and rollback script permissions."
        },
        {
          "label": "Monitoring",
          "value": "Database latency, error rate, locks, and replication lag dashboards are open."
        },
        {
          "label": "Snapshot",
          "value": "Pre-migration row counts and schema metadata captured."
        }
      ]
    }
  },
  {
    "id": "migrationCommands",
    "parentId": "root",
    "order": 6,
    "component": "CopyList",
    "props": {
      "title": "Migration commands",
      "items": [
        {
          "label": "Start transaction-safe migration",
          "value": "psql \"$DATABASE_URL\" -v ON_ERROR_STOP=1 -f migrations/2026-05-24-add-customer-status-index.sql",
          "copyText": "psql \"$DATABASE_URL\" -v ON_ERROR_STOP=1 -f migrations/2026-05-24-add-customer-status-index.sql"
        },
        {
          "label": "Capture post-run schema state",
          "value": "pg_dump --schema-only --table=customers \"$DATABASE_URL\" > artifacts/customers.schema.after.sql",
          "copyText": "pg_dump --schema-only --table=customers \"$DATABASE_URL\" > artifacts/customers.schema.after.sql"
        },
        {
          "label": "Check active locks",
          "value": "SELECT pid, relation::regclass, mode, granted FROM pg_locks WHERE relation = 'customers'::regclass;",
          "copyText": "SELECT pid, relation::regclass, mode, granted FROM pg_locks WHERE relation = 'customers'::regclass;"
        }
      ]
    }
  },
  {
    "id": "validation",
    "parentId": "root",
    "order": 7,
    "component": "DataTable",
    "props": {
      "title": "Validation queries",
      "columns": [
        {
          "id": "check",
          "label": "Check",
          "align": "start"
        },
        {
          "id": "query",
          "label": "Query",
          "align": "start"
        },
        {
          "id": "expected",
          "label": "Expected result",
          "align": "start"
        }
      ],
      "rows": [
        {
          "cells": [
            {
              "path": "/checks/0/name"
            },
            {
              "path": "/checks/0/query"
            },
            {
              "path": "/checks/0/expected"
            }
          ]
        },
        {
          "cells": [
            {
              "path": "/checks/1/name"
            },
            {
              "path": "/checks/1/query"
            },
            {
              "path": "/checks/1/expected"
            }
          ]
        },
        {
          "cells": [
            {
              "path": "/checks/2/name"
            },
            {
              "path": "/checks/2/query"
            },
            {
              "path": "/checks/2/expected"
            }
          ]
        }
      ],
      "emptyMessage": "No validation queries defined."
    }
  },
  {
    "id": "rollback",
    "parentId": "root",
    "order": 8,
    "component": "AccordionBlock",
    "props": {
      "title": "Rollback steps",
      "size": "l",
      "view": "top-bottom",
      "arrowPosition": "end",
      "items": [
        {
          "title": "1. Stop dependent writes",
          "body": "Pause application writes, queue workers, scheduled jobs, and any import processes that modify customers. Confirm no migration process is still running before rollback.",
          "expanded": true,
          "disabled": false
        },
        {
          "title": "2. Run rollback SQL",
          "body": "Execute: psql \"$DATABASE_URL\" -v ON_ERROR_STOP=1 -f migrations/rollback/2026-05-24-add-customer-status-index.rollback.sql. For this migration, rollback drops idx_customers_status concurrently if it was created.",
          "expanded": true,
          "disabled": false
        },
        {
          "title": "3. Validate rollback state",
          "body": "Run the validation query against pg_indexes and confirm idx_customers_status no longer exists. Re-run customer status counts and compare with the pre-migration snapshot.",
          "expanded": false,
          "disabled": false
        },
        {
          "title": "4. Restore from backup if data is inconsistent",
          "body": "If validation shows data loss or corruption, escalate to the database owner and restore using the confirmed backup or point-in-time recovery marker. Keep the application in maintenance mode until restore validation passes.",
          "expanded": false,
          "disabled": false
        },
        {
          "title": "5. Communicate outcome",
          "body": "Update the change ticket with timestamps, operator, backup ID, validation results, rollback commands used, and current system status. Notify stakeholders before re-enabling writes.",
          "expanded": false,
          "disabled": false
        }
      ]
    }
  },
  {
    "id": "decisionCard",
    "parentId": "root",
    "order": 9,
    "component": "Card",
    "props": {
      "theme": "info",
      "view": "filled",
      "padding": "comfortable"
    }
  },
  {
    "id": "decisionTitle",
    "parentId": "decisionCard",
    "order": 0,
    "component": "Text",
    "props": {
      "text": "Go / no-go decision",
      "variant": "h3"
    }
  },
  {
    "id": "decisionText",
    "parentId": "decisionCard",
    "order": 1,
    "component": "Text",
    "props": {
      "text": "Proceed only when backup is confirmed, monitoring is active, and the operator has reviewed validation and rollback commands.",
      "variant": "body"
    }
  },
  {
    "id": "actions",
    "parentId": "decisionCard",
    "order": 2,
    "component": "Row",
    "props": {
      "gap": "normal",
      "align": "center"
    }
  },
  {
    "id": "startButton",
    "parentId": "actions",
    "order": 0,
    "component": "Button",
    "props": {
      "text": "Start migration",
      "icon": "rocket",
      "variant": "primary",
      "action": {
        "event": {
          "name": "confirm",
          "context": {
            "action": "start_migration",
            "migrationId": "2026-05-24-add-customer-status-index"
          }
        }
      },
      "disabled": {
        "path": "/backupConfirmed"
      }
    }
  },
  {
    "id": "refreshButton",
    "parentId": "actions",
    "order": 1,
    "component": "Button",
    "props": {
      "text": "Refresh status",
      "icon": "refresh",
      "variant": "outlined",
      "action": {
        "event": {
          "name": "refresh",
          "context": {
            "target": "migration_status"
          }
        }
      }
    }
  }
];
const dataModel = {
  "backupConfirmed": false,
  "migrationId": "2026-05-24-add-customer-status-index",
  "environment": "Production",
  "database": "primary-postgres",
  "estimatedWindow": "30 minutes",
  "steps": [
    {
      "phase": "Prepare",
      "status": "Required"
    },
    {
      "phase": "Backup",
      "status": "Not confirmed"
    },
    {
      "phase": "Run migration",
      "status": "Pending"
    },
    {
      "phase": "Validate",
      "status": "Pending"
    },
    {
      "phase": "Rollback if needed",
      "status": "Ready"
    }
  ],
  "checks": [
    {
      "name": "Recent backup exists",
      "query": "SELECT backup_id, completed_at, status FROM backup_jobs WHERE database_name = 'primary-postgres' ORDER BY completed_at DESC LIMIT 1;",
      "expected": "Latest backup completed successfully within the approved maintenance window."
    },
    {
      "name": "Target rows are consistent",
      "query": "SELECT status, COUNT(*) FROM customers GROUP BY status ORDER BY status;",
      "expected": "Counts match the pre-migration snapshot and no unexpected NULL statuses exist."
    },
    {
      "name": "Index is present and valid",
      "query": "SELECT indexname, indexdef FROM pg_indexes WHERE tablename = 'customers' AND indexname = 'idx_customers_status';",
      "expected": "One row returned for idx_customers_status with the expected definition."
    }
  ]
};

const iconData: Record<string, unknown> = {
  "database": DatabaseIcon,
  "shield": ShieldIcon,
  "clock": ClockIcon,
  "rocket": RocketIcon,
  "refresh": RefreshIcon,
};

export function BackupGate() {
  const childrenByParent = groupChildren(nodes);
  const renderChildren = (parentId: string) =>
    (childrenByParent.get(parentId) ?? []).map((node) => (
      <Fragment key={node.id}>{renderNode(node, childrenByParent, renderChildren)}</Fragment>
    ));

  return renderLayout(root.component, root.props ?? {}, renderChildren("root"));
}

function renderNode(
  node: Node,
  childrenByParent: Map<string, Node[]>,
  renderChildren: (parentId: string) => ReactNode[],
) {
  const props = node.props ?? {};
  const children = renderChildren(node.id);

  switch (node.component) {
    case "Column":
    case "Row":
      return renderLayout(node.component, props, children);
    case "NavigationBar":
      return (
        <ActionBar aria-label="Generated navigation">
          <ActionBar.Section>
            <ActionBar.Group>{children}</ActionBar.Group>
          </ActionBar.Section>
        </ActionBar>
      );
    case "Card":
      return (
        <Card theme={stringProp(props.theme, "normal")} view={stringProp(props.view, "filled")} size="l" type="container">
          <div style={{ padding: padding(stringProp(props.padding, "normal")) }}>{children}</div>
        </Card>
      );
    case "Text":
      return (
        <Text as={textElement(props.variant)} variant={textVariant(props.variant)} color={textColor(props.color)}>
          {formatValue(resolve(props.text))}
        </Text>
      );
    case "Icon":
      return icon(props.name, props.size);
    case "Button":
      return (
        <Button
          view={buttonView(props.variant)}
          disabled={Boolean(resolve(props.disabled))}
          loading={Boolean(resolve(props.loading))}
          selected={Boolean(resolve(props.selected))}
          onClick={() => handleAction(props.action)}
        >
          {props.icon ? icon(props.icon, "s") : null}
          {formatValue(resolve(props.text))}
        </Button>
      );
    case "TextField":
      return (
        <label style={{ display: "grid", gap: 6 }}>
          {props.label ? <Text variant="body-2">{formatValue(props.label)}</Text> : null}
          <TextInput value={String(resolve(props.value) ?? "")} placeholder={stringProp(props.placeholder)} disabled={Boolean(resolve(props.disabled))} onUpdate={() => undefined} />
        </label>
      );
    case "CheckBox":
      return <Checkbox checked={Boolean(resolve(props.value))} disabled={Boolean(resolve(props.disabled))} onUpdate={() => undefined}>{formatValue(props.label)}</Checkbox>;
    case "SwitchField":
      return <Switch checked={Boolean(resolve(props.value))} disabled={Boolean(resolve(props.disabled))} onUpdate={() => undefined}>{formatValue(props.label)}</Switch>;
    case "ChoicePicker":
      return renderChoicePicker(props);
    case "SelectField":
      return <Select label={stringProp(props.label)} value={arrayValue(resolve(props.value))} options={optionList(props.options)} placeholder={stringProp(props.placeholder)} disabled={Boolean(resolve(props.disabled))} onUpdate={() => undefined} />;
    case "SliderField":
      return (
        <label style={{ display: "grid", gap: 8 }}>
          <Text variant="body-2">{formatValue(props.label)}</Text>
          <Slider value={numberProp(resolve(props.value), 0)} min={numberProp(props.min, 0)} max={numberProp(props.max, 100)} step={numberProp(props.step, 1)} disabled={Boolean(resolve(props.disabled))} onUpdate={() => undefined} />
        </label>
      );
    case "Divider":
      return <Divider orientation={props.axis === "vertical" ? "vertical" : "horizontal"} />;
    case "AlertBlock":
      return <Alert layout="horizontal" theme={stringProp(props.tone, "info")} view="filled" title={stringProp(props.title)} message={stringProp(props.message)} />;
    case "MetricGrid":
      return renderMetricGrid(props.items);
    case "DataTable":
      return renderDataTable(props);
    case "ProgressList":
      return renderProgressList(props.items);
    case "DefinitionListBlock":
      return renderDefinitionList(props);
    case "LinkList":
      return renderLinkList(props.items);
    case "UserList":
      return renderUserList(props.items);
    case "LabelGroup":
      return renderLabels(props.items);
    case "HeroBlock":
      return renderHeroBlock(props);
    case "FilterBar":
      return renderFilterBar(props);
    case "FeaturePanelGrid":
      return renderFeaturePanels(props.items);
    case "CardGrid":
      return renderCardGrid(props);
    case "TabsBlock":
      return renderTabs(props);
    case "EmptyStateList":
      return renderEmptyStates(props.items);
    case "LoadingStateList":
      return renderLoadingStates(props.items);
    case "BreadcrumbTrail":
      return renderBreadcrumbs(props);
    case "StepperBlock":
      return renderStepper(props);
    case "AccordionBlock":
      return renderAccordion(props);
    case "CopyList":
      return renderCopyList(props);
    default:
      return null;
  }
}

function renderLayout(component: string, props: Record<string, unknown>, children: ReactNode[]) {
  return (
    <div
      style={{
        alignItems: align(props.align),
        display: "flex",
        flexDirection: component === "Row" ? "row" : "column",
        flexWrap: component === "Row" ? "wrap" : undefined,
        gap: gap(props.gap),
        justifyContent: justify(props.justify),
      }}
    >
      {children}
    </div>
  );
}

function renderChoicePicker(props: Record<string, unknown>) {
  return (
    <div style={{ display: "grid", gap: 8 }}>
      {props.label ? <Text variant="body-2">{formatValue(props.label)}</Text> : null}
      <div style={{ display: "flex", flexWrap: "wrap", gap: 8 }}>
        {optionList(props.options).map((option) => (
          <Button key={option.value} view={arrayValue(resolve(props.value)).includes(option.value) ? "action" : "outlined"}>
            {option.content}
          </Button>
        ))}
      </div>
    </div>
  );
}

function renderMetricGrid(items: unknown) {
  return (
    <div style={{ display: "grid", gridTemplateColumns: "repeat(auto-fit, minmax(160px, 1fr))", gap: 12 }}>
      {arrayRecords(items).map((item) => (
        <Card key={String(item.label) + "-" + String(item.value)} theme="normal" view="filled" type="container">
          <div style={{ display: "grid", gap: 6, padding: 14 }}>
            <Text variant="caption-2" color="secondary">{formatValue(item.label)}</Text>
            <Text variant="header-1">{formatValue(item.value)}</Text>
            {item.description ? <Text variant="caption-2" color="secondary">{formatValue(item.description)}</Text> : null}
          </div>
        </Card>
      ))}
    </div>
  );
}

function renderDataTable(props: Record<string, unknown>) {
  const columns = arrayRecords(props.columns).map((column) => ({
    id: String(column.id),
    name: formatValue(column.label),
    align: column.align === "end" ? "right" : column.align === "center" ? "center" : "left",
  }));
  const data = arrayRecords(props.rows).map((row, rowIndex) => ({
    id: rowIndex,
    ...Object.fromEntries(arrayValues(row.cells).map((cell, index) => [String(columns[index]?.id ?? index), formatValue(cell)])),
  }));

  return (
    <div style={{ display: "grid", gap: 10 }}>
      {props.title ? <Text as="h3" variant="subheader-2">{formatValue(props.title)}</Text> : null}
      <Table columns={columns} data={data} emptyMessage={stringProp(props.emptyMessage, "No data")} />
    </div>
  );
}

function renderProgressList(items: unknown) {
  return (
    <div style={{ display: "grid", gap: 10 }}>
      {arrayRecords(items).map((item) => (
        <div key={String(item.label)} style={{ display: "grid", gap: 4 }}>
          <Text variant="body-2">{formatValue(item.label)}</Text>
          <Progress value={numberProp(resolve(item.value), 0)} theme={stringProp(item.tone, "info")} />
          {item.text ? <Text variant="caption-2" color="secondary">{formatValue(item.text)}</Text> : null}
        </div>
      ))}
    </div>
  );
}

function renderDefinitionList(props: Record<string, unknown>) {
  return (
    <div style={{ display: "grid", gap: 10 }}>
      {props.title ? <Text as="h3" variant="subheader-2">{formatValue(props.title)}</Text> : null}
      <DefinitionList>
        {arrayRecords(props.items).map((item) => (
          <DefinitionList.Item key={String(item.label)} name={formatValue(item.label)}>{formatValue(item.value)}</DefinitionList.Item>
        ))}
      </DefinitionList>
    </div>
  );
}

function renderLinkList(items: unknown) {
  return (
    <div style={{ display: "grid", gap: 8 }}>
      {arrayRecords(items).map((item) => (
        <Link key={String(item.label)} href={stringProp(item.href, "#")}>{formatValue(item.label)}</Link>
      ))}
    </div>
  );
}

function renderUserList(items: unknown) {
  return (
    <div style={{ display: "grid", gap: 10 }}>
      {arrayRecords(items).map((item) => (
        <User key={String(item.name)} name={stringProp(item.name)} description={stringProp(item.description)} />
      ))}
    </div>
  );
}

function renderLabels(items: unknown) {
  return (
    <div style={{ display: "flex", flexWrap: "wrap", gap: 8 }}>
      {arrayRecords(items).map((item) => (
        <Label key={String(item.label) + "-" + String(item.value ?? "")} theme={stringProp(item.tone, "normal")} type={stringProp(item.type, "default")}>
          {formatValue(item.label)}{item.value ? ": " + formatValue(item.value) : ""}
        </Label>
      ))}
    </div>
  );
}

function renderHeroBlock(props: Record<string, unknown>) {
  return (
    <section style={{ display: "grid", gap: 16, padding: 24, border: "1px solid var(--g-color-line-generic)", borderRadius: 12 }}>
      {props.eyebrow ? <Text variant="caption-2" color="secondary">{formatValue(props.eyebrow)}</Text> : null}
      <Text as="h1" variant="display-1">{formatValue(props.title)}</Text>
      {props.body ? <Text variant="body-2" color="secondary">{formatValue(props.body)}</Text> : null}
      {renderLabels(props.labels)}
      {renderActionButtons(props.actions)}
    </section>
  );
}

function renderFilterBar(props: Record<string, unknown>) {
  return (
    <div style={{ display: "flex", alignItems: "center", flexWrap: "wrap", gap: 8 }}>
      {props.title ? <Text variant="subheader-2">{formatValue(props.title)}</Text> : null}
      <TextInput value={stringProp(props.searchValue)} placeholder={stringProp(props.searchPlaceholder, "Search")} onUpdate={() => undefined} />
      {arrayRecords(props.filters).map((filter) => (
        <Button key={String(filter.value)} view={filter.active ? "action" : "outlined"}>{formatValue(filter.label)}</Button>
      ))}
      {arrayRecords(props.sortOptions).length > 0 ? (
        <Select label={stringProp(props.sortLabel)} value={stringProp(props.sortValue) ? [stringProp(props.sortValue)] : []} options={optionList(props.sortOptions)} onUpdate={() => undefined} />
      ) : null}
    </div>
  );
}

function renderFeaturePanels(items: unknown) {
  return (
    <div style={{ display: "grid", gridTemplateColumns: "repeat(auto-fit, minmax(180px, 1fr))", gap: 12 }}>
      {arrayRecords(items).map((item) => (
        <Card key={String(item.title)} theme="normal" view="filled" type="container">
          <div style={{ display: "grid", gap: 8, padding: 14 }}>
            <Text variant="subheader-2">{formatValue(item.title)}</Text>
            {item.value ? <Text variant="header-1">{formatValue(item.value)}</Text> : null}
            <Text variant="body-2" color="secondary">{formatValue(item.body)}</Text>
            {renderLabels(item.labels)}
          </div>
        </Card>
      ))}
    </div>
  );
}

function renderCardGrid(props: Record<string, unknown>) {
  return (
    <div style={{ display: "grid", gap: 12 }}>
      {props.title ? <Text as="h3" variant="subheader-2">{formatValue(props.title)}</Text> : null}
      {props.description ? <Text variant="body-2" color="secondary">{formatValue(props.description)}</Text> : null}
      <div style={{ display: "grid", gridTemplateColumns: cardColumns(props.columns), gap: 12 }}>
        {arrayRecords(props.items).map((item) => (
          <Card key={String(item.title)} theme="normal" view="filled" type="container">
            <div style={{ display: "grid", gap: 10, padding: 14 }}>
              <Text variant="subheader-2">{formatValue(item.title)}</Text>
              {item.subtitle ? <Text variant="body-2" color="secondary">{formatValue(item.subtitle)}</Text> : null}
              {item.value ? <Text variant="header-1">{formatValue(item.value)}</Text> : null}
              <Text variant="body-2">{formatValue(item.body)}</Text>
              {renderLabels(item.labels)}
              {renderActionButtons(item.actions)}
            </div>
          </Card>
        ))}
      </div>
    </div>
  );
}

function renderTabs(props: Record<string, unknown>) {
  const items = arrayRecords(props.items);
  const active = String(items.find((item) => item.active)?.value ?? items[0]?.value ?? "");

  return (
    <TabProvider value={active}>
      <div style={{ display: "grid", gap: 10 }}>
        {props.title ? <Text variant="subheader-2">{formatValue(props.title)}</Text> : null}
        <TabList size={stringProp(props.size, "m")}>{items.map((item) => <Tab key={String(item.value)} value={String(item.value)}>{formatValue(item.label)}</Tab>)}</TabList>
        {items.map((item) => <TabPanel key={String(item.value)} value={String(item.value)}>{formatValue(item.body)}</TabPanel>)}
      </div>
    </TabProvider>
  );
}

function renderEmptyStates(items: unknown) {
  return (
    <div style={{ display: "grid", gap: 12 }}>
      {arrayRecords(items).map((item) => (
        <PlaceholderContainer key={String(item.title)} size={stringProp(item.size, "m")}>
          <Text variant="subheader-2">{formatValue(item.title)}</Text>
          <Text variant="body-2" color="secondary">{formatValue(item.description)}</Text>
        </PlaceholderContainer>
      ))}
    </div>
  );
}

function renderLoadingStates(items: unknown) {
  return (
    <div style={{ display: "grid", gap: 12 }}>
      {arrayRecords(items).map((item) => (
        <div key={String(item.label)} style={{ display: "flex", gap: 8, alignItems: "center" }}>
          <Spin size={stringProp(item.size, "s")} />
          <Text variant="body-2">{formatValue(item.label)}</Text>
        </div>
      ))}
    </div>
  );
}

function renderBreadcrumbs(props: Record<string, unknown>) {
  return <Breadcrumbs items={arrayRecords(props.items).map((item) => ({ text: formatValue(item.label), href: stringProp(item.href, undefined) }))} />;
}

function renderStepper(props: Record<string, unknown>) {
  return (
    <div style={{ display: "grid", gap: 10 }}>
      {props.title ? <Text variant="subheader-2">{formatValue(props.title)}</Text> : null}
      <Stepper size={stringProp(props.size, "m")} items={arrayRecords(props.items).map((item) => ({ id: String(item.value), title: formatValue(item.label), view: stringProp(item.view, "idle"), disabled: Boolean(item.disabled) }))} activeStep={String(arrayRecords(props.items).find((item) => item.active)?.value ?? "")} />
    </div>
  );
}

function renderAccordion(props: Record<string, unknown>) {
  return (
    <div style={{ display: "grid", gap: 10 }}>
      {props.title ? <Text variant="subheader-2">{formatValue(props.title)}</Text> : null}
      <Accordion view={stringProp(props.view, "solid")} size={stringProp(props.size, "m")}>
        {arrayRecords(props.items).map((item) => (
          <Accordion.Item key={String(item.title)} title={formatValue(item.title)} disabled={Boolean(item.disabled)}>
            {formatValue(item.body)}
          </Accordion.Item>
        ))}
      </Accordion>
    </div>
  );
}

function renderCopyList(props: Record<string, unknown>) {
  return (
    <div style={{ display: "grid", gap: 10 }}>
      {props.title ? <Text variant="subheader-2">{formatValue(props.title)}</Text> : null}
      {arrayRecords(props.items).map((item) => (
        <CopyToClipboard key={String(item.label)} text={stringProp(item.copyText)}>
          <Button view="outlined">{formatValue(item.label)}: {formatValue(item.value)}</Button>
        </CopyToClipboard>
      ))}
    </div>
  );
}

function renderActionButtons(actions: unknown) {
  const items = arrayRecords(actions);

  if (items.length === 0) {
    return null;
  }

  return (
    <div style={{ display: "flex", flexWrap: "wrap", gap: 8 }}>
      {items.map((action) => (
        <Button key={String(action.label)} view={buttonView(action.variant)} disabled={Boolean(action.disabled)} loading={Boolean(action.loading)} selected={Boolean(action.selected)} onClick={() => handleAction(action.action)}>
          {action.icon ? icon(action.icon, "s") : null}
          {formatValue(action.label)}
        </Button>
      ))}
    </div>
  );
}

function handleAction(action: unknown) {
  console.log("A2UI action", action);
}

function groupChildren(nodes: Node[]) {
  const map = new Map<string, Node[]>();

  for (const node of nodes) {
    const parentId = node.parentId ?? "root";
    const list = map.get(parentId) ?? [];
    list.push(node);
    map.set(parentId, list);
  }

  for (const list of map.values()) {
    list.sort((left, right) => left.order === right.order ? left.id.localeCompare(right.id) : left.order - right.order);
  }

  return map;
}

function resolve(value: unknown): unknown {
  if (isRecord(value) && typeof value.path === "string") {
    return getPath(dataModel, value.path);
  }

  return value;
}

function getPath(source: unknown, path: string): unknown {
  if (path === "/") {
    return source;
  }

  return path
    .split("/")
    .slice(1)
    .map((part) => part.replace(/~1/g, "/").replace(/~0/g, "~"))
    .reduce<unknown>((current, key) => {
      if (!isRecord(current) && !Array.isArray(current)) {
        return undefined;
      }

      return (current as Record<string, unknown>)[key];
    }, source);
}

const iconAliases: Record<string, string> = {
  "open_details": "arrowRight"
};

function icon(name: unknown, size: unknown) {
  const normalizedName = normalizeIconName(name);
  const data =
    typeof normalizedName === "string" ? iconData[normalizedName] : undefined;

  return data ? <Icon data={data} size={size === "l" ? 20 : size === "m" ? 16 : 14} /> : null;
}

function normalizeIconName(name: unknown) {
  return typeof name === "string" && Object.prototype.hasOwnProperty.call(iconAliases, name)
    ? iconAliases[name]
    : name;
}

function buttonView(value: unknown) {
  return value === "primary" ? "action" : stringProp(value, "normal");
}

function textVariant(value: unknown) {
  const variants: Record<string, string> = {
    h1: "display-1",
    h2: "subheader-3",
    h3: "subheader-2",
    h4: "subheader-2",
    h5: "subheader-2",
    body: "body-2",
    caption: "caption-2",
  };

  return variants[stringProp(value, "body")] ?? "body-2";
}

function textElement(value: unknown) {
  return ["h1", "h2", "h3", "h4", "h5"].includes(String(value)) ? String(value) : "span";
}

function textColor(value: unknown) {
  return stringProp(value, "primary");
}

function align(value: unknown) {
  return value === "stretch" ? "stretch" : value === "center" ? "center" : value === "end" ? "flex-end" : "flex-start";
}

function justify(value: unknown) {
  return value === "spaceBetween" ? "space-between" : value === "center" ? "center" : value === "end" ? "flex-end" : "flex-start";
}

function gap(value: unknown) {
  return value === "spacious" ? 24 : value === "compact" ? 8 : 14;
}

function padding(value: unknown) {
  return value === "spacious" ? 24 : value === "comfortable" ? 20 : value === "compact" ? 12 : 16;
}

function cardColumns(value: unknown) {
  if (value === "three") {
    return "repeat(3, minmax(0, 1fr))";
  }

  if (value === "two") {
    return "repeat(2, minmax(0, 1fr))";
  }

  return "repeat(auto-fit, minmax(220px, 1fr))";
}

function optionList(value: unknown) {
  return arrayRecords(value).map((option) => ({
    value: String(option.value),
    content: formatValue(option.label),
  }));
}

function arrayRecords(value: unknown) {
  const resolved = resolve(value);

  return Array.isArray(resolved) ? resolved.filter(isRecord) : [];
}

function arrayValues(value: unknown) {
  const resolved = resolve(value);

  return Array.isArray(resolved) ? resolved : [];
}

function arrayValue(value: unknown) {
  if (Array.isArray(value)) {
    return value.map(String);
  }

  return typeof value === "string" && value ? [value] : [];
}

function numberProp(value: unknown, fallback: number) {
  return typeof value === "number" ? value : fallback;
}

function stringProp(value: unknown, fallback = "") {
  const resolved = resolve(value);

  return typeof resolved === "string" ? resolved : fallback;
}

function formatValue(value: unknown) {
  const resolved = resolve(value);

  if (resolved === null || resolved === undefined) {
    return "";
  }

  return String(resolved);
}

function isRecord(value: unknown): value is Record<string, unknown> {
  return typeof value === "object" && value !== null && !Array.isArray(value);
}