/**
 * Editor actions that several places trigger the same way (inspector, hierarchy context
 * menu, keyboard): they run the command and put the selection where the user expects it.
 */
import { RemoveAnimationKeysCommand, RemoveAnimationTracksCommand } from '../core/commands/animationCommands';
import { annotationNoun, RemoveAnnotationCommand } from '../core/commands/annotationCommands';
import { DeleteAssetCommand, SetActiveSceneCommand } from '../core/commands/assetCommands';
import {
  AddColliderCommand,
  AddJointCommand,
  AddRigidbodyCommand,
  colliderRefusal,
  jointRefusal,
  rigidbodyRefusal,
} from '../core/commands/colliderCommands';
import { oneStep } from '../core/commands/CompoundCommand';
import { CreateContainerCommand } from '../core/commands/containerCommands';
import { RemoveClipCommand } from '../core/commands/clipCommands';
import { RemoveFrameCommand } from '../core/commands/frameCommands';
import { DisconnectCommand, FoldEdgeCommand, RemoveNodeCommand } from '../core/commands/graphCommands';
import { RemoveSceneObjectsCommand } from '../core/commands/sceneObjectCommands';
import { RemoveVectorShapeCommand, RemoveVectorShapesCommand } from '../core/commands/vectorArtCommands';
import type { AssetType } from '../core/model/AssetTypes';
import { curveUsages } from '../core/model/curve';
import { structTypeUsages } from '../core/model/structTypes';
import { generatesPictures } from '../core/model/generated';
import { isTemplateContent } from '../core/model/instance';
import type { Command } from '../core/commands/Command';
import { findAnnotation, findNode, nodeDef } from '../core/graph';
import { findAsset, findGraphAsset, type ObjectHolder, type Project } from '../core/model/Project';
import { ownerSong } from '../core/music/embedded';
import type { SceneObject } from '../core/model/SceneObject';
import { pixelArtRefIds } from '../core/model/pixelart';
import { textureRefIds } from '../core/model/texture';
import { videoRefIds } from '../core/model/video';
import {
  animationsUsing,
  cellsPainted,
  tilesUsing,
  findPropertyUsages,
  findUsages,
} from '../core/model/usages';
import { Dialog } from '../ui';
import { removeSongItems, removeTrack } from './song/songActions';
import { type EditorState, graphSelection, objectSelection } from './state';

/**
 * What a double-click on an asset does, wherever it happens (asset panel, "Open …" entries, a link
 * in the inspector): open its tab – and a scene, whose tab is the scene view, becomes the active one.
 */
export function activateAsset(state: EditorState, assetId: string): void {
  if (findAsset(state.project, assetId)?.type === 'scene') state.execute(new SetActiveSceneCommand(assetId));
  state.openAsset(assetId);
}

/** Groups the objects into a new container asset placed in their stead; selects the container. */
export function createContainer(state: EditorState, holderId: string, objectIds: readonly string[]): boolean {
  const command = new CreateContainerCommand(holderId, objectIds);
  if (!state.execute(command)) return false;
  state.select(objectSelection(holderId, [command.objectId]));
  return true;
}

/** The test `AddColliderCommand` makes; template content has no structure of its own to change. */
export function canAddCollider(project: Project, holder: ObjectHolder, object: SceneObject): boolean {
  return !isTemplateContent(holder, object.id) && colliderRefusal(project, holder, object) === null;
}

/**
 * Gives the object a collider child – a new one sized like it, or the existing `assetId` (#222);
 * selects the collider.
 */
export function addCollider(state: EditorState, holderId: string, objectId: string, assetId = ''): boolean {
  const command = new AddColliderCommand(holderId, objectId, assetId);
  if (!state.execute(command)) return false;
  state.select(objectSelection(holderId, [command.objectId]));
  return true;
}

/** The test `AddRigidbodyCommand` makes; template content has no structure of its own to change. */
export function canAddRigidbody(project: Project, holder: ObjectHolder, object: SceneObject): boolean {
  return !isTemplateContent(holder, object.id) && rigidbodyRefusal(project, holder, object) === null;
}

/** Gives the object a rigidbody child, new or the existing `assetId`; selects the rigidbody. */
export function addRigidbody(state: EditorState, holderId: string, objectId: string, assetId = ''): boolean {
  const command = new AddRigidbodyCommand(holderId, objectId, assetId);
  if (!state.execute(command)) return false;
  state.select(objectSelection(holderId, [command.objectId]));
  return true;
}

/** The test `AddJointCommand` makes; template content has no structure of its own to change. */
export function canAddJoint(project: Project, holder: ObjectHolder, object: SceneObject): boolean {
  return !isTemplateContent(holder, object.id) && jointRefusal(project, holder, object) === null;
}

/** Gives the object a joint child (#154), new or the existing `assetId`; selects the joint. */
export function addJoint(state: EditorState, holderId: string, objectId: string, assetId = ''): boolean {
  const command = new AddJointCommand(holderId, objectId, assetId);
  if (!state.execute(command)) return false;
  state.select(objectSelection(holderId, [command.objectId]));
  return true;
}

/** Removes the objects (with their subtrees) as one undo step. */
export function removeObjects(state: EditorState, holderId: string, objectIds: readonly string[]): boolean {
  return state.execute(new RemoveSceneObjectsCommand(holderId, objectIds));
}

/** Takes shapes of a vector art out as one undo step; the drawing itself stays selected. */
export function removeShapes(state: EditorState, assetId: string, shapeIds: readonly string[]): boolean {
  if (shapeIds.length === 0) return false;
  const removed = state.execute(
    shapeIds.length === 1
      ? new RemoveVectorShapeCommand(assetId, shapeIds[0]!)
      : new RemoveVectorShapesCommand(assetId, shapeIds),
  );
  if (removed) state.select({ kind: 'asset', assetId });
  return removed;
}

/** Deletes graph nodes as one undo step, however many were selected. */
export function removeNodes(state: EditorState, assetId: string, nodeIds: readonly string[]): boolean {
  const commands = nodeIds.map((id) => new RemoveNodeCommand(assetId, id));
  return commands.length > 0 && state.execute(oneStep(`Delete ${commands.length} nodes`, commands));
}

/** What a link is called in this graph: between states it is a transition. */
export function linkNoun(state: EditorState, assetId: string): string {
  return findGraphAsset(state.project, assetId)?.type === 'statemachine' ? 'transition' : 'link';
}

/**
 * Hides the links as one undo step and lets go of them: a hidden link has no line left to be
 * picked on, its mark at the port is the handle from then on.
 */
export function hideLinks(state: EditorState, assetId: string, edgeIds: readonly string[]): boolean {
  const commands = edgeIds.map((id) => new FoldEdgeCommand(assetId, id, true));
  if (
    commands.length === 0 ||
    !state.execute(oneStep(commands.length === 1 ? 'Hide link' : 'Hide links', commands))
  )
    return false;
  state.select(
    graphSelection(assetId, state.selectedNodeIds, state.selectedAnnotationIds) ?? { kind: 'asset', assetId },
  );
  return true;
}

/**
 * Deletes everything a graph selection holds – nodes, boxes and links alike – as one undo step,
 * since one band caught them and one keypress asked for them to go. Boxes still take none of
 * their nodes. Links go first, so one at a node that goes too is not asked for twice.
 */
export function removeGraphSelection(
  state: EditorState,
  assetId: string,
  nodeIds: readonly string[],
  annotationIds: readonly string[],
  edgeIds: readonly string[] = [],
): boolean {
  const graph = findGraphAsset(state.project, assetId)?.graph;
  const links = (graph?.edges ?? []).filter((e) => edgeIds.includes(e.id));
  // A node that comes and goes on its own – a track of a song (#350) – stays, the rest goes.
  const removable = nodeIds.filter((id) => !nodeDef((graph && findNode(graph, id))?.type ?? '')?.fixed);
  const commands: Command[] = [
    ...links.map((e) => new DisconnectCommand(assetId, e.id)),
    ...removable.map((id) => new RemoveNodeCommand(assetId, id)),
  ];
  let noun = links.length === 1 ? linkNoun(state, assetId) : '';
  for (const id of annotationIds) {
    const found = graph && findAnnotation(graph, id);
    if (!found) continue;
    noun = annotationNoun(found.kind);
    commands.push(new RemoveAnnotationCommand(assetId, found.kind, id));
  }
  if (commands.length === 0) {
    if (nodeIds.length > 0) state.setNotice('These nodes come and go on their own and cannot be deleted');
    return false;
  }
  const label =
    commands.length === 1 && noun !== ''
      ? `Delete ${noun}`
      : removable.length === commands.length
        ? `Delete ${commands.length} nodes`
        : `Delete ${commands.length} items`;
  return state.execute(oneStep(label, commands));
}

/**
 * What Delete does to the selection; false when nothing is selected. Every kind is a case of its
 * own, so a new kind of selection cannot slip through without saying what Delete takes away.
 */
export function removeSelection(state: EditorState): boolean {
  const s = state.selection;
  if (!s) return false;
  switch (s.kind) {
    case 'asset':
      confirmDeleteAsset(state, s.assetId);
      return true;
    case 'object':
      removeObjects(state, s.holderId, s.objectIds);
      return true;
    case 'node':
      removeGraphSelection(state, s.assetId, s.nodeIds, s.annotationIds, s.edgeIds);
      return true;
    case 'annotation':
      removeGraphSelection(state, s.assetId, [], s.annotationIds, s.edgeIds);
      return true;
    case 'edge':
      removeGraphSelection(state, s.assetId, [], [], s.edgeIds);
      return true;
    case 'frame':
      state.execute(new RemoveFrameCommand(s.assetId, s.frameId));
      return true;
    case 'clip':
      state.execute(new RemoveClipCommand(s.assetId, s.clipId));
      return true;
    case 'shape':
      removeShapes(state, s.assetId, s.shapeIds);
      return true;
    case 'track':
      // The keys when some are picked, else the row itself – like a frame of a texture.
      state.execute(
        s.keys.length > 0
          ? new RemoveAnimationKeysCommand(s.assetId, s.keys)
          : new RemoveAnimationTracksCommand(s.assetId, [s.trackId]),
      );
      return true;
    case 'song':
      // The items when some are picked, else the track itself and what lies on it.
      if (s.itemIds.length > 0) removeSongItems(state, s.assetId, s.itemIds);
      else removeTrack(state, s.assetId, s.trackId);
      return true;
  }
}

/** Asks before deleting an asset, spelling out what goes with it. */
export function confirmDeleteAsset(state: EditorState, assetId: string): void {
  const asset = findAsset(state.project, assetId);
  if (!asset) return;
  const song = ownerSong(state.project, asset);
  if (song) {
    state.setNotice(`"${asset.name}" lives in the song "${song.name}" and goes with what uses it there`);
    return;
  }
  const usages = findUsages(state.project, assetId).length;
  // A texture is never placed but worn through a property, so counting placed instances would
  // report "unused". Its frames count as the texture itself.
  const ids =
    asset.type === 'texture'
      ? textureRefIds(asset)
      : asset.type === 'pixelart'
        ? pixelArtRefIds(asset)
        : asset.type === 'video'
          ? videoRefIds(asset)
          : [assetId];
  const references = findPropertyUsages(state.project, ids).length;
  // An asset that draws its own picture (#185) is worn the same way, only without frames.
  const picture = asset.type === 'texture' || asset.type === 'video' || generatesPictures(asset.type);
  const animations = picture ? animationsUsing(state.project, ids).length : 0;
  const tiles = picture ? tilesUsing(state.project, ids).length : 0;
  const eased = asset.type === 'curve' ? curveUsages(state.project, assetId) : { keys: 0, nodes: 0 };
  const typed =
    asset.type === 'struct' ? structTypeUsages(state.project, assetId) : { places: 0, lists: 0, nodes: 0 };
  const lists = typed.lists > 0 ? `, ${typed.lists} list(s)` : '';
  const painted = asset.type === 'tile' ? cellsPainted(state.project, assetId) : { tilemaps: 0, cells: 0 };
  const detail =
    asset.type === 'scene'
      ? `The scene and its ${asset.objects.length} object(s) are removed.`
      : painted.cells > 0
        ? `${painted.cells} cell(s) on ${painted.tilemaps} tilemap(s) are painted with it and become empty.`
        : eased.keys > 0 || eased.nodes > 0
          ? `${eased.keys} animation key(s) and ${eased.nodes} Lerp node(s) use it and blend linearly instead.`
          : typed.places > 0 || typed.lists > 0 || typed.nodes > 0
            ? `${typed.places} struct(s)${lists} and ${typed.nodes} node(s) use it and keep its fields as their own.`
            : references > 0 || animations > 0 || tiles > 0
              ? wornDetail(references, animations, tiles, asset.type)
              : usages === 0
                ? 'This cannot be undone with Ctrl+Z after reload.'
                : asset.type === 'container'
                  ? `${usages} placed container(s) are removed together with their content.`
                  : `${usages} placed instance(s) are removed as well (scenes and container templates).`;
  new Dialog(`Delete "${asset.name}"?`, detail, [
    { label: 'Cancel' },
    { label: 'Delete', danger: true, onClick: () => state.execute(new DeleteAssetCommand(assetId)) },
  ]).openCentered();
}

function wornDetail(sprites: number, animations: number, tiles: number, type: AssetType): string {
  if (type === 'font') return `${sprites} text(s) reference it and fall back to the editor's own typeface.`;
  const who = [
    sprites > 0 ? `${sprites} sprite(s)` : '',
    animations > 0 ? `${animations} animation(s)` : '',
    tiles > 0 ? `${tiles} tile(s)` : '',
  ].filter(Boolean);
  // "a, b and c" rather than "a and b and c", which three kinds of user made reachable.
  const list =
    who.length > 2 ? `${who.slice(0, -1).join(', ')} and ${who[who.length - 1]}` : who.join(' and ');
  return `${list} reference it and show the plain color in its place.`;
}