import {
  RenameAssetCommand,
  ResetAssetPropertyCommand,
  SetAssetPropertyCommand,
} from '../../core/commands/assetCommands';
import { nextVariableName } from '../../core/commands/naming';
import {
  AddVariableCommand,
  RemoveVariableCommand,
  RenameVariableCommand,
} from '../../core/commands/variableCommands';
import type { Asset, BehaviorAsset } from '../../core/model/Asset';
import { findAsset, type Project } from '../../core/model/Project';
import {
  COMMON_PROPS,
  type PropertyDef,
  schemaForAsset,
  VARIABLE_KINDS,
  type VariableKind,
} from '../../core/properties/PropertySchema';
import { isModified, resolveAssetProps } from '../../core/properties/resolve';
import { Button, Dropdown, HStack, Label, Menu, Spacer, TextField, Theme } from '../../ui';
import { createField, createFieldRow, type FieldHandlers, labelledRow } from './fieldFactory';
import { addNote, addTitle, type InspectorHost } from './host';
import { previewingHandlers } from './previewHandlers';

const VARIABLE_KIND_LABELS: Record<VariableKind, string> = {
  number: 'Number',
  boolean: 'Boolean',
  text: 'Text',
};
// Keyed by the wide `PropertyDef['kind']` because `variables` is a `PropertyDef[]`, but only the
// three VariableKinds ever reach it – the '?' fallback is a safety net, not a case to fill in.
const VARIABLE_KIND_MARKS: Partial<Record<PropertyDef['kind'], string>> = {
  number: '#',
  boolean: '✓',
  text: 'Aa',
};

/** Structure-defining facts of an asset selection: the schema keys and kinds. */
export function assetSignature(project: Project, assetId: string): string {
  const asset = findAsset(project, assetId);
  return asset
    ? schemaForAsset(asset)
        .map((d) => `${d.key}:${d.kind}`)
        .join(',')
    : 'missing';
}

/** Name, properties (asset values marked when they differ from the default) and, for behaviors, the variables. */
export function buildAssetSection(host: InspectorHost, assetId: string): void {
  const asset = findAsset(host.state.project, assetId);
  if (!asset) return;
  addTitle(host, `${asset.type.toUpperCase()} ASSET`);
  host.nameField = new TextField(asset.name, {
    onChange: (name) => {
      if (name.trim()) host.state.execute(new RenameAssetCommand(assetId, name.trim()));
      else host.nameField?.setValue(asset.name);
    },
  });
  const { row } = labelledRow('Name');
  row.add(host.nameField, 1);
  host.body.add(row);

  if (asset.type === 'behavior') {
    buildProps(host, asset, COMMON_PROPS);
    buildVariables(host, asset);
  } else {
    buildProps(host, asset, schemaForAsset(asset));
  }
}

/** Pushes the current asset values into the rows. False when the asset is gone (rebuild). */
export function refreshAssetSection(host: InspectorHost, assetId: string): boolean {
  const asset = findAsset(host.state.project, assetId);
  if (!asset) return false;
  host.nameField?.setValue(asset.name);
  const values = resolveAssetProps(asset);
  for (const [key, row] of host.fields) {
    row.setValue(values[key] ?? 0);
    row.setModified(isModified(asset, key));
  }
  return true;
}

function buildProps(host: InspectorHost, asset: Asset, schema: readonly PropertyDef[]): void {
  const values = resolveAssetProps(asset);
  for (const def of schema) {
    const row = createFieldRow(
      host,
      def,
      values[def.key] ?? def.default,
      assetHandlers(host, asset.id, def),
      () => {
        const target = findAsset(host.state.project, asset.id);
        if (!target || !isModified(target, def.key)) return [];
        return [
          {
            label: 'Reset to default',
            onSelect: () => host.state.execute(new ResetAssetPropertyCommand(asset.id, def.key)),
          },
        ];
      },
    );
    row.setModified(isModified(asset, def.key));
    host.fields.set(def.key, row);
    host.body.add(row.row);
  }
}

/** Previews straight into the asset while editing; the command records the value from before the preview. */
function assetHandlers(host: InspectorHost, assetId: string, def: PropertyDef): FieldHandlers {
  return previewingHandlers<Asset>(host, {
    target: () => findAsset(host.state.project, assetId),
    read: (asset) => asset.props[def.key],
    write: (asset, value) => (asset.props[def.key] = value),
    // No `remove`: an asset bag is dense – loading fills the defaults, a new variable brings its own.
    commit: (value) => new SetAssetPropertyCommand(assetId, def.key, value),
  });
}

/** Variables of a behavior: kind mark, name, default value, remove – plus an "add" menu. */
function buildVariables(host: InspectorHost, asset: BehaviorAsset): void {
  const header = new HStack({ gap: Theme.gap, align: 'center' });
  header.add(new Label('VARIABLES', { style: 'title' }), 1);
  const add = new Dropdown('+ Variable', { variant: 'ghost' });
  add.onClick = () => {
    const items = VARIABLE_KINDS.map((kind) => ({
      label: VARIABLE_KIND_LABELS[kind],
      onSelect: () => {
        const current = findAsset(host.state.project, asset.id);
        if (current?.type === 'behavior')
          host.state.execute(new AddVariableCommand(asset.id, nextVariableName(current), kind));
      },
    }));
    new Menu(items).openBelow(add);
  };
  header.add(add);
  host.body.add(header);

  if (asset.variables.length === 0) addNote(host, 'No variables yet.');
  const values = resolveAssetProps(asset);
  for (const def of asset.variables) {
    const row = new HStack({ gap: Theme.gap, align: 'center' });
    row.minHeight = Theme.rowHeight;
    const mark = new Label(VARIABLE_KIND_MARKS[def.kind] ?? '?', { style: 'small', align: 'center' });
    mark.minWidth = 18;
    row.add(mark);
    row.add(
      new TextField(def.key, {
        width: 90,
        onChange: (next) => {
          host.state.execute(new RenameVariableCommand(asset.id, def.key, next.trim()));
        },
      }),
    );
    const field = createField(host, def, values[def.key] ?? def.default, assetHandlers(host, asset.id, def));
    row.add(field.widget, field.grow ? 1 : 0);
    if (!field.grow) row.add(new Spacer(), 1);
    row.add(
      new Button('×', {
        variant: 'ghost',
        width: Theme.controlHeight,
        onClick: () => host.state.execute(new RemoveVariableCommand(asset.id, def.key)),
      }),
    );
    host.fields.set(def.key, { row, setValue: field.setValue, setModified: () => {} });
    host.body.add(row);
  }
}