import {
  ApplyOverrideToAssetCommand,
  ApplyOverrideToContainerCommand,
  ApplyPositionToContainerCommand,
  RevertOverrideToTemplateCommand,
  RevertPositionToTemplateCommand,
} from '../../core/commands/applyCommands';
import { UnpackContainerCommand } from '../../core/commands/containerCommands';
import {
  ClearOverrideCommand,
  MoveSceneObjectCommand,
  RenameSceneObjectCommand,
  SetEditorOffsetCommand,
  SetOverrideCommand,
} from '../../core/commands/sceneObjectCommands';
import type { Asset } from '../../core/model/Asset';
import { findObject } from '../../core/model/hierarchy';
import {
  type InstanceTarget,
  isLiveInstance,
  isTemplateContent,
  type ObjectRef,
  resolvedHolder,
} from '../../core/model/instance';
import type { PropertyValue } from '../../core/model/Properties';
import { findAsset, findObjectHolder, type Project } from '../../core/model/Project';
import type { SceneObject } from '../../core/model/SceneObject';
import {
  COMMON_PROPS,
  isCommonProp,
  isTransformProp,
  type PropertyDef,
  schemaFor,
  schemaForObject,
} from '../../core/properties/PropertySchema';
import {
  deviatesFromAsset,
  deviatesFromTemplate,
  resolveSceneObjectProps,
} from '../../core/properties/resolve';
import { Button } from '../../ui';
import { createContainer, removeObjects } from '../actions';
import { aspectActions, sizeCommand } from './aspectAction';
import { defSignature } from './assetSection';
import { actionIf, createFieldRow, type FieldRow, labelledRow, type RowActions } from './fieldFactory';
import { addGap, addNameField, addNote, addTitle, type InspectorHost } from './host';
import type { EditorState, ListSlot } from '../state';
import { parentRow } from './parentRow';
import { listOpener, previewingHandlers, structFields } from './previewHandlers';
import { buildTilemapSection, tilemapSignature } from './tilemapSection';
import { overrideValue } from './valueSpecs';
import { buildVariable } from './variableRows';
import { currentProps, currentRef, deviations, positionMoved, targetOf, viewOf } from './objectQueries';
import { componentRow, OFFSET_AXES, offsetKey, POSITION_AXES } from './vectorRows';

/**
 * The rows a placed object shows for what it was placed from: a behavior's declared variables, any
 * other asset's schema minus the common switches.
 */
export function objectRows(project: Project, asset: Asset, object: SceneObject): PropertyDef[] {
  return asset.type === 'behavior'
    ? asset.variables
    : schemaForObject(project, asset, object).filter((def) => !isCommonProp(def.key));
}

/** Structure-defining facts of an object selection: parent, template link, schema and painting. */
export function objectSignature(
  state: EditorState,
  holderId: string,
  objectIds: readonly string[],
  objectId: string,
): string {
  const project = state.project;
  if (objectIds.length > 1) return `multi|${objectIds.join(',')}`;
  const holder = findObjectHolder(project, holderId);
  const view = holder && resolvedHolder(project, holder);
  const object = view && findObject(view, objectId);
  const asset = object && findAsset(project, object.assetId);
  if (!holder || !object || !asset) return 'missing';
  const kind = isTemplateContent(holder, objectId)
    ? 'template'
    : isLiveInstance(project, holder, object)
      ? 'instance'
      : '';
  const rows = schemaForObject(project, asset, object);
  const painting = asset.type === 'tilemap' ? `|${tilemapSignature(state, asset)}` : '';
  return `${object.parentId}|${kind}|` + rows.map(defSignature).join(',') + painting;
}

/** Several objects: what they are, and the actions that apply to all of them at once. */
export function buildObjectsSection(host: InspectorHost, holderId: string, objectIds: string[]): void {
  const view = viewOf(host.state.project, holderId);
  if (!view) return;
  addTitle(host, `${objectIds.length} OBJECTS SELECTED`);
  for (const id of objectIds) {
    const object = findObject(view, id);
    const asset = object && findAsset(host.state.project, object.assetId);
    if (object && asset) addNote(host, `${object.name || asset.name}  ·  ${asset.type}`);
  }
  addGap(host);
  addNote(host, 'Ctrl-click adds or removes objects.', 'small');
  addNote(host, 'Dragging one in the viewport moves all of them.', 'small');
  addGap(host);
  const holder = findObjectHolder(host.state.project, holderId)!;
  if (objectIds.some((id) => isTemplateContent(holder, id))) {
    addNote(host, 'Part of the selection comes from a container', 'small');
    addNote(host, 'template, so grouping and removing are off.', 'small');
    return;
  }
  host.body.add(
    new Button('Create container', { onClick: () => createContainer(host.state, holderId, objectIds) }),
  );
  addNote(host, 'Groups the selection into a reusable container', 'small');
  addNote(host, 'asset placed at its centre (Ctrl+G).', 'small');
  addGap(host);
  host.body.add(
    new Button('Remove', {
      variant: 'danger',
      onClick: () => removeObjects(host.state, holderId, objectIds),
    }),
  );
}

export function buildObjectSection(host: InspectorHost, holderId: string, objectId: string): void {
  const { project } = host.state;
  const view = viewOf(project, holderId);
  const object = view && findObject(view, objectId);
  const asset = object && findAsset(project, object.assetId);
  if (!view || !object || !asset) return;
  const target = targetOf(project, holderId, objectId);

  addTitle(host, `${asset.type.toUpperCase()} OBJECT`);
  addNameField(host, object.name, {
    placeholder: asset.name,
    onChange: (name) => host.state.execute(new RenameSceneObjectCommand(holderId, objectId, name.trim())),
  });
  assetLink(host, 'Asset', asset);
  host.body.add(parentRow(host, view, object, target !== undefined));
  // Content of a placed container: values compare against the template, not just the asset.
  if (target) assetLink(host, 'Part of', target.asset);

  // The master switch, right where it is looked for: above everything type-specific.
  const resolved = resolveSceneObjectProps(host.state.project, asset, object);
  for (const def of COMMON_PROPS) propertyRow(host, holderId, objectId, asset, def, resolved);
  // A behavior's own switches sit with it rather than in the section below: that one lists what
  // the behavior *declares*, and `Run in editor` is not something it declared.
  if (asset.type === 'behavior')
    for (const def of schemaFor('behavior').filter((d) => !isCommonProp(d.key)))
      propertyRow(host, holderId, objectId, asset, def, resolved);

  addTitle(host, object.parentId ? 'POSITION (LOCAL TO PARENT)' : 'POSITION');
  for (const axis of POSITION_AXES) {
    const moved = () => positionMoved(host.state, holderId, objectId, axis);
    componentRow(host, holderId, objectId, object.position[axis], {
      key: axis,
      label: axis.toUpperCase(),
      axis,
      read: (ref) => ref.object.position,
      write: (ref, value) => ref.setPosition(value),
      command: (v) => new MoveSceneObjectCommand(holderId, objectId, v),
      reset: () =>
        actionIf(moved(), 'Reset to container', () =>
          host.state.execute(new RevertPositionToTemplateCommand(holderId, objectId, axis)),
        ),
      apply: () =>
        actionIf(moved(), 'Apply to container', () =>
          host.state.execute(new ApplyPositionToContainerCommand(holderId, objectId, axis)),
        ),
    });
  }

  // Turn, size and mirror sit with the position: together they are where the object is.
  const transform = schemaForObject(project, asset, object).filter((def) => isTransformProp(def.key));
  if (transform.length > 0) addTitle(host, 'TRANSFORM');
  for (const def of transform) propertyRow(host, holderId, objectId, asset, def, resolved);

  // Where the object is *drawn* in the viewport, nothing else – for pulling stacked objects apart.
  addTitle(host, 'EDITOR OFFSET (SCENE VIEW ONLY)');
  for (const axis of OFFSET_AXES) {
    componentRow(host, holderId, objectId, object.editorOffset[axis], {
      key: offsetKey(axis),
      label: `Offset ${axis.toUpperCase()}`,
      axis,
      read: (ref) => ref.object.editorOffset,
      write: (ref, value) => ref.setEditorOffset(value),
      command: (v) => new SetEditorOffsetCommand(holderId, objectId, v),
      // No apply: the offset never leaves the placed object.
      reset: () => {
        const current = currentRef(host.state, holderId, objectId)?.object;
        if (!current) return [];
        return actionIf(current.editorOffset[axis] !== 0, 'Reset to 0', () =>
          host.state.execute(
            new SetEditorOffsetCommand(holderId, objectId, { ...current.editorOffset, [axis]: 0 }),
          ),
        );
      },
    });
  }

  // Asset properties (or behavior variables) with overrides; the switches are shown above.
  const values = resolveSceneObjectProps(host.state.project, asset, object);
  const own = objectRows(host.state.project, asset, object);
  if (own.length > 0 || asset.type === 'behavior')
    addTitle(host, asset.type === 'behavior' ? 'VARIABLES' : 'PROPERTIES');
  if (own.length === 0 && asset.type === 'behavior') addNote(host, 'The behavior declares no variables.');
  for (const def of own) propertyRow(host, holderId, objectId, asset, def, values, asset.type === 'behavior');
  markObjectRows(host, object, asset, target);

  if (asset.type === 'container') contentSection(host, holderId, object, asset.objects.length);
  if (asset.type === 'tilemap') buildTilemapSection(host, asset);
}

function assetLink(host: InspectorHost, label: string, asset: Asset): void {
  const { row } = labelledRow(label);
  row.add(
    new Button(asset.name, {
      variant: 'ghost',
      onClick: () => host.state.select({ kind: 'asset', assetId: asset.id }),
    }),
    1,
  );
  host.body.add(row);
}

/**
 * What a placed container holds. While it follows its template the content cannot be changed here –
 * unpacking writes it into the scene as ordinary objects, which cuts the link for good.
 */
function contentSection(
  host: InspectorHost,
  holderId: string,
  object: SceneObject,
  templateCount: number,
): void {
  const holder = findObjectHolder(host.state.project, holderId);
  const live = Boolean(holder && isLiveInstance(host.state.project, holder, object));
  addTitle(host, 'CONTENT');
  if (!live) {
    addNote(host, 'Unpacked: its content is stored in the scene.');
    return;
  }
  addNote(
    host,
    templateCount === 0 ? 'The container is empty.' : `Follows a template of ${templateCount} object(s).`,
  );
  if (templateCount === 0) return;
  addNote(host, 'Its content is listed below it in the hierarchy.', 'small');
  addGap(host);
  host.body.add(
    new Button('Unpack', {
      variant: 'ghost',
      onClick: () => host.state.execute(new UnpackContainerCommand(holderId, object.id)),
    }),
  );
  addNote(host, 'Copies the content into the scene and stops', 'small');
  addNote(host, 'following the template.', 'small');
}

/** Pushes the current model values into the rows. False when the object is gone (rebuild). */
export function refreshObjectSection(host: InspectorHost, holderId: string, objectId: string): boolean {
  const { project } = host.state;
  const view = viewOf(project, holderId);
  const object = view && findObject(view, objectId);
  const asset = object && findAsset(project, object.assetId);
  if (!view || !object || !asset) return false;
  host.nameField?.setValue(object.name);
  for (const axis of POSITION_AXES) host.fields.get(axis)?.setValue(object.position[axis]);
  for (const axis of OFFSET_AXES) host.fields.get(offsetKey(axis))?.setValue(object.editorOffset[axis]);
  const values = resolveSceneObjectProps(project, asset, object);
  for (const def of schemaForObject(project, asset, object))
    host.fields.get(def.key)?.setValue(values[def.key] ?? def.default);
  markObjectRows(host, object, asset, targetOf(project, holderId, objectId));
  return true;
}

/**
 * One editable property of a placed object. Reset always goes to the nearest base (the template inside
 * a container), while "Apply to asset" reaches past it, dropping the template's override.
 */
function propertyRow(
  host: InspectorHost,
  holderId: string,
  objectId: string,
  owner: Asset,
  def: PropertyDef,
  values: Record<string, PropertyValue>,
  variable = false,
): FieldRow {
  const bases = () => deviations(host.state, holderId, objectId, def.key);
  const overrideSpec = overrideValue(host.state, holderId, objectId, def.key);
  const fieldSlot = (field: string): ListSlot => ({
    kind: 'object',
    holderId,
    objectId,
    key: def.key,
    field,
  });
  const rowActions: RowActions = {
    extra: aspectActions(
      host,
      owner,
      def,
      () => currentProps(host.state, holderId, objectId),
      (values) =>
        host.state.execute(
          sizeCommand(values, (axis, value) => new SetOverrideCommand(holderId, objectId, axis, value)),
        ),
    ),
    reset: () => {
      const { template, asset } = bases();
      return [
        ...actionIf(template, 'Reset to container', () =>
          host.state.execute(new RevertOverrideToTemplateCommand(holderId, objectId, def.key)),
        ),
        ...actionIf(asset, 'Reset to asset', () =>
          host.state.execute(new ClearOverrideCommand(holderId, objectId, def.key)),
        ),
      ];
    },
    apply: () => {
      const { template, applyToAsset } = bases();
      return [
        ...actionIf(template, 'Apply to container', () =>
          host.state.execute(new ApplyOverrideToContainerCommand(holderId, objectId, def.key)),
        ),
        ...actionIf(applyToAsset, 'Apply to asset', () =>
          host.state.execute(new ApplyOverrideToAssetCommand(holderId, objectId, def.key)),
        ),
      ];
    },
  };

  const value = values[def.key] ?? def.default;
  const handlers = {
    ...previewingHandlers<ObjectRef>(host, overrideSpec),
    ...listOpener(host.state, def, () => ({ kind: 'object', holderId, objectId, key: def.key })),
    ...structFields<ObjectRef>(host, def, overrideSpec, fieldSlot),
  };
  // A variable reads exactly like it does on its asset, which adds its own rows to the body.
  const row = variable
    ? buildVariable(host, def, value, handlers, { actions: rowActions })
    : createFieldRow(host, def, value, handlers, rowActions);
  host.fields.set(def.key, row);
  if (!variable) host.body.add(row.row);
  return row;
}

/**
 * Gold marks exactly what the ↺/↑ buttons offer: for content of a placed container a deviation
 * from the template (position per axis, overrides), for any other object one from the asset. The
 * editor offset has one base only – no offset at all.
 */
function markObjectRows(
  host: InspectorHost,
  object: SceneObject,
  asset: Asset,
  target: InstanceTarget | undefined,
): void {
  for (const axis of POSITION_AXES)
    host.fields
      .get(axis)
      ?.setModified(Boolean(target) && object.position[axis] !== target!.base.position[axis]);
  for (const axis of OFFSET_AXES)
    host.fields.get(offsetKey(axis))?.setModified(object.editorOffset[axis] !== 0);
  const project = host.state.project;
  for (const def of schemaForObject(project, asset, object)) {
    const deviates = target
      ? deviatesFromTemplate(object, target.base, def.key)
      : deviatesFromAsset(project, object, asset, def.key);
    host.fields.get(def.key)?.setModified(deviates);
  }
}