import {
  CreateAssetCommand,
  DeleteAssetCommand,
  DuplicateAssetCommand,
  RenameAssetCommand,
  ResetAssetPropertyCommand,
  SetAssetPropertyCommand,
  SetStartSceneCommand,
} from '../../core/commands/assetCommands';
import { type Command, CommandError } from '../../core/commands/Command';
import {
  AddNodeCommand,
  ConnectCommand,
  DisconnectCommand,
  MoveNodeCommand,
  RemoveNodeCommand,
  SetNodeParamCommand,
} from '../../core/commands/graphCommands';
import {
  ClearOverrideCommand,
  MoveSceneObjectCommand,
  PlaceAssetCommand,
  RemoveSceneObjectsCommand,
  RenameSceneObjectCommand,
  SetOverrideCommand,
  SetParentCommand,
} from '../../core/commands/sceneObjectCommands';
import {
  AddVariableCommand,
  RemoveVariableCommand,
  RenameVariableCommand,
} from '../../core/commands/variableCommands';
import { ASSET_TYPES, type AssetType } from '../../core/model/AssetTypes';
import type { PropertyBag, PropertyValue } from '../../core/model/Properties';
import { findGraphAsset, findObjectHolder, type Project } from '../../core/model/Project';
import { VARIABLE_KINDS, type VariableKind } from '../../core/properties/kinds';
import { coerceValue } from '../../core/properties/PropertySchema';
import { type PaletteEntry, paletteEntries } from '../graph/paletteEntries';
import type { ArgSchema } from './argCheck';

/** What a command is built from: the project as it stands before the edit, and where new nodes go. */
export interface BuildContext {
  project: Project;
  /** A free place for a node the agent gave none, right of what the graph and this edit hold. */
  spot(assetId: string): { x: number; y: number };
}

/** The command, and the ids of what it makes – what later steps of the same edit can name. */
export interface Built {
  command: Command;
  made?: Record<string, string>;
}

type Args = Record<string, unknown>;

/** One command the agent can run (#429): what it does, its arguments, and how it is made. */
export interface CatalogCommand {
  name: string;
  description: string;
  args: ArgSchema;
  /** Deletes something the user has to agree to first – decision 4 of #429. */
  confirms?: true;
  build(args: Args, context: BuildContext): Built;
}

/** Assets the agent cannot make: each needs a file, and there is no upload for agents. */
const FILE_TYPES: readonly AssetType[] = ['texture', 'font', 'sound', 'video'];

const id = (description: string): ArgSchema => ({ type: 'string', minLength: 1, description });
const number = (description: string): ArgSchema => ({ type: 'number', description });
const anyValue: ArgSchema = {
  description: 'Any JSON value; it is checked against the kind of the property.',
};
const object = (properties: Record<string, ArgSchema>, required: string[]): ArgSchema => ({
  type: 'object',
  properties,
  required,
  additionalProperties: false,
});

const ASSET = id('Id of the asset.');
const HOLDER = id('Id of the scene or container the object is in.');
const OBJECT = id('Id of the placed object.');
const GRAPH = id('Id of the asset holding the graph (behavior, state machine, shader, ...).');
const NODE = id('Id of the node.');
const PORT_END = object({ node: NODE, port: id('Key of the port, as get_graph lists it.') }, [
  'node',
  'port',
]);

const text = (args: Args, key: string): string => args[key] as string;
const numberOf = (args: Args, key: string): number => args[key] as number;

export const COMMANDS: readonly CatalogCommand[] = [
  {
    name: 'create_asset',
    description:
      'Makes a new asset. A scene is where objects are placed; a sprite, text or camera is placed into one; ' +
      "a behavior is a graph of nodes that runs on the object it is placed under. Textures, fonts, sounds and videos need a file and can't be made here.",
    args: object(
      {
        type: {
          type: 'string',
          enum: ASSET_TYPES.filter((type) => !FILE_TYPES.includes(type)),
          description: 'The kind of asset.',
        },
        name: { type: 'string', minLength: 1, description: 'Its name in the asset list.' },
        props: {
          type: 'object',
          description: "Starting values of its properties by key (see catalog topic 'asset_types').",
        },
      },
      ['type', 'name'],
    ),
    build: (args) => {
      const command = new CreateAssetCommand(
        text(args, 'type') as AssetType,
        text(args, 'name'),
        (args.props ?? {}) as PropertyBag,
      );
      return { command, made: { id: command.asset.id } };
    },
  },
  {
    name: 'rename_asset',
    description: 'Renames an asset.',
    args: object({ asset: ASSET, name: { type: 'string', minLength: 1 } }, ['asset', 'name']),
    build: (args) => ({ command: new RenameAssetCommand(text(args, 'asset'), text(args, 'name')) }),
  },
  {
    name: 'duplicate_asset',
    description: 'Copies an asset; the copy comes right behind it in the list.',
    args: object({ asset: ASSET }, ['asset']),
    build: (args) => {
      const command = new DuplicateAssetCommand(text(args, 'asset'));
      return { command, made: { id: command.copyId } };
    },
  },
  {
    name: 'delete_asset',
    description:
      'Deletes an asset and what depends on it (placed copies of it, for one). The user is asked first and may say no.',
    args: object({ asset: ASSET }, ['asset']),
    confirms: true,
    build: (args) => ({ command: new DeleteAssetCommand(text(args, 'asset')) }),
  },
  {
    name: 'set_asset_property',
    description: "Sets a property of an asset by its key (see get_asset, or catalog topic 'asset_types').",
    args: object({ asset: ASSET, key: id('Key of the property.'), value: anyValue }, [
      'asset',
      'key',
      'value',
    ]),
    build: (args) => ({
      command: new SetAssetPropertyCommand(
        text(args, 'asset'),
        text(args, 'key'),
        args.value as PropertyValue,
      ),
    }),
  },
  {
    name: 'reset_asset_property',
    description: 'Puts a property of an asset back to what a new asset starts with.',
    args: object({ asset: ASSET, key: id('Key of the property.') }, ['asset', 'key']),
    build: (args) => ({ command: new ResetAssetPropertyCommand(text(args, 'asset'), text(args, 'key')) }),
  },
  {
    name: 'set_start_scene',
    description: 'Makes a scene the one the game starts in; an empty scene id takes that back.',
    args: object({ scene: { type: 'string', description: 'Id of the scene, or "".' } }, ['scene']),
    build: (args) => ({ command: new SetStartSceneCommand(text(args, 'scene')) }),
  },
  {
    name: 'add_variable',
    description: 'Adds a variable to a behavior or a variables asset, starting at the default of its kind.',
    args: object(
      {
        asset: ASSET,
        key: id('Name of the variable: letters, digits and _, not starting with a digit.'),
        kind: { type: 'string', enum: VARIABLE_KINDS, description: 'What it holds.' },
      },
      ['asset', 'key', 'kind'],
    ),
    build: (args) => ({
      command: new AddVariableCommand(
        text(args, 'asset'),
        text(args, 'key'),
        text(args, 'kind') as VariableKind,
      ),
    }),
  },
  {
    name: 'remove_variable',
    description: 'Removes a variable, its value and every override of it on placed objects.',
    args: object({ asset: ASSET, key: id('Name of the variable.') }, ['asset', 'key']),
    build: (args) => ({ command: new RemoveVariableCommand(text(args, 'asset'), text(args, 'key')) }),
  },
  {
    name: 'rename_variable',
    description: 'Renames a variable; nodes and overrides that use it follow.',
    args: object({ asset: ASSET, from: id('Its name now.'), to: id('Its new name.') }, [
      'asset',
      'from',
      'to',
    ]),
    build: (args) => ({
      command: new RenameVariableCommand(text(args, 'asset'), text(args, 'from'), text(args, 'to')),
    }),
  },
  {
    name: 'place_asset',
    description:
      'Places an asset into a scene or container as a new object, at a position in the world. ' +
      'A behavior, collider or rigidbody is placed under the object it belongs to (parent).',
    args: object(
      {
        in: HOLDER,
        asset: ASSET,
        x: number('World x, pixels.'),
        y: number('World y, pixels, down is positive.'),
        parent: {
          type: 'string',
          description: 'Id of the object to place it under, or "" for the top level.',
        },
      },
      ['in', 'asset', 'x', 'y'],
    ),
    build: (args) => {
      const command = new PlaceAssetCommand(
        text(args, 'in'),
        text(args, 'asset'),
        { x: numberOf(args, 'x'), y: numberOf(args, 'y') },
        (args.parent as string | undefined) ?? '',
      );
      return { command, made: { id: command.objectId } };
    },
  },
  {
    name: 'remove_objects',
    description: 'Removes placed objects together with everything placed under them.',
    args: object({ in: HOLDER, objects: { type: 'array', items: OBJECT, minItems: 1 } }, ['in', 'objects']),
    build: (args) => ({ command: new RemoveSceneObjectsCommand(text(args, 'in'), args.objects as string[]) }),
  },
  {
    name: 'move_object',
    description: 'Moves a placed object; x and y are relative to its parent (the world at the top level).',
    args: object({ in: HOLDER, object: OBJECT, x: number('x'), y: number('y'), z: number('Draw order.') }, [
      'in',
      'object',
      'x',
      'y',
    ]),
    build: (args, { project }) => {
      const z =
        typeof args.z === 'number' ? args.z : currentZ(project, text(args, 'in'), text(args, 'object'));
      return {
        command: new MoveSceneObjectCommand(text(args, 'in'), text(args, 'object'), {
          x: numberOf(args, 'x'),
          y: numberOf(args, 'y'),
          z,
        }),
      };
    },
  },
  {
    name: 'rename_object',
    description: 'Names a placed object; "" goes back to the name of its asset.',
    args: object({ in: HOLDER, object: OBJECT, name: { type: 'string' } }, ['in', 'object', 'name']),
    build: (args) => ({
      command: new RenameSceneObjectCommand(text(args, 'in'), text(args, 'object'), text(args, 'name')),
    }),
  },
  {
    name: 'set_override',
    description: 'Gives one placed object its own value for a property of its asset.',
    args: object({ in: HOLDER, object: OBJECT, key: id('Key of the property.'), value: anyValue }, [
      'in',
      'object',
      'key',
      'value',
    ]),
    build: (args) => ({
      command: new SetOverrideCommand(
        text(args, 'in'),
        text(args, 'object'),
        text(args, 'key'),
        args.value as PropertyValue,
      ),
    }),
  },
  {
    name: 'clear_override',
    description: "Lets a placed object follow its asset's value for a property again.",
    args: object({ in: HOLDER, object: OBJECT, key: id('Key of the property.') }, ['in', 'object', 'key']),
    build: (args) => ({
      command: new ClearOverrideCommand(text(args, 'in'), text(args, 'object'), text(args, 'key')),
    }),
  },
  {
    name: 'set_parent',
    description:
      'Puts a placed object under another one ("" for the top level); it keeps its place in the world.',
    args: object({ in: HOLDER, object: OBJECT, parent: { type: 'string' } }, ['in', 'object', 'parent']),
    build: (args) => ({
      command: new SetParentCommand(text(args, 'in'), text(args, 'object'), text(args, 'parent')),
    }),
  },
  {
    name: 'add_node',
    description:
      "Adds a node to a graph. `node` is an entry of catalog topic 'nodes' for that graph (its id, e.g. " +
      '"OnKeyHeld", "Move", or "RunBehavior:<id>"). Leave x and y out: the editor finds the node a place.',
    args: object(
      {
        asset: GRAPH,
        node: id('The entry id from the catalog.'),
        params: { type: 'object', description: 'Settings and typed-in input values by key.' },
        x: number('Only to place it by hand.'),
        y: number('Only to place it by hand.'),
      },
      ['asset', 'node'],
    ),
    build: (args, context) => {
      const assetId = text(args, 'asset');
      const entry = paletteEntry(context.project, assetId, text(args, 'node'));
      const spot =
        typeof args.x === 'number' && typeof args.y === 'number'
          ? { x: args.x, y: args.y }
          : context.spot(assetId);
      const params = { ...entry.params, ...coercedParams(entry, (args.params ?? {}) as PropertyBag) };
      const command = new AddNodeCommand(assetId, entry.def.type, spot.x, spot.y, params);
      const made: Record<string, string> = { id: command.node.id };
      if (command.closing) made.closing = command.closing.id;
      return { command, made };
    },
  },
  {
    name: 'remove_node',
    description: 'Removes a node and every edge on it.',
    args: object({ asset: GRAPH, node: NODE }, ['asset', 'node']),
    build: (args) => ({ command: new RemoveNodeCommand(text(args, 'asset'), text(args, 'node')) }),
  },
  {
    name: 'move_node',
    description: 'Moves a node in its graph.',
    args: object({ asset: GRAPH, node: NODE, x: number('x'), y: number('y') }, ['asset', 'node', 'x', 'y']),
    build: (args) => ({
      command: new MoveNodeCommand(
        text(args, 'asset'),
        text(args, 'node'),
        numberOf(args, 'x'),
        numberOf(args, 'y'),
      ),
    }),
  },
  {
    name: 'set_node_param',
    description: 'Sets a setting of a node, or the value typed into one of its inputs that has no edge.',
    args: object({ asset: GRAPH, node: NODE, key: id('Key of the setting or input.'), value: anyValue }, [
      'asset',
      'node',
      'key',
      'value',
    ]),
    build: (args) => ({
      command: new SetNodeParamCommand(
        text(args, 'asset'),
        text(args, 'node'),
        text(args, 'key'),
        args.value as PropertyValue,
      ),
    }),
  },
  {
    name: 'connect',
    description:
      'Draws an edge from an output to an input. Exec ports carry the flow, the others values; an input ' +
      'that holds one value loses the edge it had.',
    args: object({ asset: GRAPH, from: PORT_END, to: PORT_END }, ['asset', 'from', 'to']),
    build: (args) => {
      const end = (key: string) => args[key] as { node: string; port: string };
      const command = new ConnectCommand(text(args, 'asset'), end('from'), end('to'));
      return { command, made: { id: command.edge.id } };
    },
  },
  {
    name: 'disconnect',
    description: 'Removes an edge.',
    args: object({ asset: GRAPH, edge: id('Id of the edge.') }, ['asset', 'edge']),
    build: (args) => ({ command: new DisconnectCommand(text(args, 'asset'), text(args, 'edge')) }),
  },
];

export function catalogCommand(name: string): CatalogCommand | undefined {
  return COMMANDS.find((command) => command.name === name);
}

/** The palette entry a node is added from: by its id, else by its label when only one has it. */
export function paletteEntry(project: Project, assetId: string, wanted: string): PaletteEntry {
  const holder = findGraphAsset(project, assetId);
  if (!holder) throw new CommandError(`There is no graph asset ${assetId}`);
  const entries = paletteEntries(project, holder);
  const byId = entries.find((entry) => entry.id === wanted);
  if (byId) return byId;
  const byLabel = entries.filter((entry) => entry.def.label.toLowerCase() === wanted.toLowerCase());
  if (byLabel.length === 1) return byLabel[0]!;
  throw new CommandError(
    `A ${holder.type} graph has no node "${wanted}" – look it up with catalog topic "nodes" and this asset`,
  );
}

/** Settings are held to their kind, as the inspector holds them; a typed-in input value stays as given. */
function coercedParams(entry: PaletteEntry, params: PropertyBag): PropertyBag {
  const coerced: PropertyBag = {};
  for (const [key, value] of Object.entries(params)) {
    const param = entry.def.params.find((p) => p.key === key);
    coerced[key] = param && param.kind !== 'enum' ? coerceValue(param, value) : value;
  }
  return coerced;
}

function currentZ(project: Project, holderId: string, objectId: string): number {
  return findObjectHolder(project, holderId)?.objects.find((o) => o.id === objectId)?.position.z ?? 0;
}