import { APP_LOCALES, type AppLocale } from '../../core/i18n/locale';
import { type RouteId } from '../../core/routing/route-ids';

export type CommandId =
  | 'help'
  | 'projects'
  | 'servicesAi'
  | 'cv'
  | 'contact'
  | 'brew'
  | 'ignite'
  | 'rev'
  | 'clear'
  | 'close';

export const COMMAND_IDS: readonly CommandId[] = [
  'help',
  'projects',
  'servicesAi',
  'cv',
  'contact',
  'brew',
  'ignite',
  'rev',
  'clear',
  'close',
];

export type CommandAction =
  | { readonly kind: 'navigate'; readonly routeId: RouteId }
  | { readonly kind: 'openCv' }
  | { readonly kind: 'message'; readonly messageKey: 'help' | 'brew' | 'ignite' | 'rev' }
  | { readonly kind: 'clear' }
  | { readonly kind: 'close' };

export interface CommandDefinition {
  readonly id: CommandId;
  readonly input: string;
  readonly aliases: Record<AppLocale, readonly string[]>;
  readonly action: CommandAction;
}

export type CommandMatch =
  | { readonly kind: 'command'; readonly definition: CommandDefinition }
  | { readonly kind: 'empty' }
  | { readonly kind: 'unknown'; readonly input: string };

export const COMMANDS: readonly CommandDefinition[] = [
  {
    id: 'help',
    input: 'help',
    aliases: { de: ['hilfe'], en: [] },
    action: { kind: 'message', messageKey: 'help' },
  },
  {
    id: 'projects',
    input: 'projects',
    aliases: { de: ['projekte'], en: [] },
    action: { kind: 'navigate', routeId: 'projects' },
  },
  {
    id: 'servicesAi',
    input: 'services ai',
    aliases: { de: ['leistungen ai'], en: [] },
    action: { kind: 'navigate', routeId: 'servicesAi' },
  },
  {
    id: 'cv',
    input: 'cv',
    aliases: { de: ['lebenslauf'], en: ['resume'] },
    action: { kind: 'openCv' },
  },
  {
    id: 'contact',
    input: 'contact',
    aliases: { de: ['kontakt'], en: [] },
    action: { kind: 'navigate', routeId: 'contact' },
  },
  {
    id: 'brew',
    input: 'brew',
    aliases: { de: ['brauen'], en: [] },
    action: { kind: 'message', messageKey: 'brew' },
  },
  {
    id: 'ignite',
    input: 'ignite',
    aliases: { de: ['zuenden', 'zünden'], en: [] },
    action: { kind: 'message', messageKey: 'ignite' },
  },
  {
    id: 'rev',
    input: 'rev',
    aliases: { de: ['drehzahl'], en: [] },
    action: { kind: 'message', messageKey: 'rev' },
  },
  {
    id: 'clear',
    input: 'clear',
    aliases: { de: ['leeren'], en: [] },
    action: { kind: 'clear' },
  },
  {
    id: 'close',
    input: 'close',
    aliases: { de: ['schliessen', 'schließen'], en: [] },
    action: { kind: 'close' },
  },
];

const COMMAND_LOOKUP = buildCommandLookup(COMMANDS);

function buildCommandLookup(
  commands: readonly CommandDefinition[],
): ReadonlyMap<string, CommandDefinition> {
  const lookup = new Map<string, CommandDefinition>();

  for (const command of commands) {
    lookup.set(normalizeCommandInput(command.input), command);

    for (const locale of APP_LOCALES) {
      for (const alias of command.aliases[locale]) {
        lookup.set(normalizeCommandInput(alias), command);
      }
    }
  }

  return lookup;
}

export function normalizeCommandInput(raw: string): string {
  return raw.trim().replace(/\s+/g, ' ').toLowerCase();
}

export function parseCommand(raw: string): CommandMatch {
  const normalized = normalizeCommandInput(raw);

  if (normalized.length === 0) {
    return { kind: 'empty' };
  }

  const definition = COMMAND_LOOKUP.get(normalized);

  if (!definition) {
    return { kind: 'unknown', input: raw };
  }

  return { kind: 'command', definition };
}

export function suggestCommands(raw: string, locale: AppLocale): readonly CommandDefinition[] {
  const normalized = normalizeCommandInput(raw);

  return COMMANDS.filter((command) => {
    if (normalized.length === 0) {
      return true;
    }

    if (command.input.startsWith(normalized)) {
      return true;
    }

    return command.aliases[locale].some((alias) =>
      normalizeCommandInput(alias).startsWith(normalized),
    );
  });
}