import type { Command } from "./command";
import { commandIds } from "./ids";

export type CommandPaletteOpenPayload = {
  query?: string;
  selectedIndex?: number;
} | undefined;

export type CommandPaletteSetQueryPayload = {
  query: string;
};

export type CommandPaletteSetSelectedIndexPayload = {
  selectedIndex: number;
};

export const commandPaletteOpenCommand: Command<CommandPaletteOpenPayload> = {
  id: commandIds.commandPaletteOpen,
  name: "Open command palette",
  history: { mode: "ignore" },
  execute({ state }, payload) {
    const commandPalette = {
      open: true,
      query: payload?.query ?? "",
      selectedIndex: normalizeSelectedIndex(payload?.selectedIndex ?? 0),
    };
    if (
      state.editor.commandPalette.open === commandPalette.open &&
      state.editor.commandPalette.query === commandPalette.query &&
      state.editor.commandPalette.selectedIndex === commandPalette.selectedIndex
    ) {
      return state;
    }

    return {
      ...state,
      editor: {
        ...state.editor,
        commandPalette,
      },
    };
  },
};

export const commandPaletteCloseCommand: Command = {
  id: commandIds.commandPaletteClose,
  name: "Close command palette",
  history: { mode: "ignore" },
  execute({ state }) {
    const commandPalette = { open: false, query: "", selectedIndex: 0 };
    if (
      state.editor.commandPalette.open === commandPalette.open &&
      state.editor.commandPalette.query === commandPalette.query &&
      state.editor.commandPalette.selectedIndex === commandPalette.selectedIndex
    ) {
      return state;
    }

    return {
      ...state,
      editor: {
        ...state.editor,
        commandPalette,
      },
    };
  },
};

export const commandPaletteSetQueryCommand: Command<CommandPaletteSetQueryPayload> = {
  id: commandIds.commandPaletteSetQuery,
  name: "Set command palette query",
  history: { mode: "ignore" },
  execute({ state }, payload) {
    if (state.editor.commandPalette.query === payload.query && state.editor.commandPalette.selectedIndex === 0) return state;

    return {
      ...state,
      editor: {
        ...state.editor,
        commandPalette: {
          ...state.editor.commandPalette,
          query: payload.query,
          selectedIndex: 0,
        },
      },
    };
  },
};

export const commandPaletteSetSelectedIndexCommand: Command<CommandPaletteSetSelectedIndexPayload> = {
  id: commandIds.commandPaletteSetSelectedIndex,
  name: "Set command palette selected index",
  history: { mode: "ignore" },
  execute({ state }, payload) {
    const selectedIndex = normalizeSelectedIndex(payload.selectedIndex);
    if (state.editor.commandPalette.selectedIndex === selectedIndex) return state;

    return {
      ...state,
      editor: {
        ...state.editor,
        commandPalette: {
          ...state.editor.commandPalette,
          selectedIndex,
        },
      },
    };
  },
};

export const commandPaletteCommands = [
  commandPaletteOpenCommand,
  commandPaletteCloseCommand,
  commandPaletteSetQueryCommand,
  commandPaletteSetSelectedIndexCommand,
] satisfies Command<unknown>[];

function normalizeSelectedIndex(value: number) {
  if (!Number.isFinite(value)) return 0;
  return Math.max(0, Math.floor(value));
}