/**
 * Human-facing `/role` command for DeepSeek Harness.
 *
 * The command reads the same role files as the Claude skill, then injects the
 * role instructions as a user message and starts a turn so the model can answer
 * the five-line role summary. The command's own result is UI-only.
 */

import { createUserMessage } from './lib/message.js'
import { buildRoleText, listRoles, parseRole } from './lib/role.js'

function currentDirectory(workingDirectory, agent) {
  try {
    const cwd = workingDirectory.get(agent.session)
    if (typeof cwd === 'string' && cwd !== '') return cwd
  } catch {
    // Fall through to the process directory.
  }
  return process.cwd()
}

export function registerRoleCommand({
  commands,
  workingDirectory,
  rolesDir,
  projectRolesDir,
  roleNames,
  logger,
}) {
  commands.register({
    name: 'role',
    description: 'Переключить сессию в роль dev | admin | analyst | qa',
    input: { hint: 'dev|admin|analyst|qa' },
    handler: async ({ agent, rawInput }) => {
      const cwd = currentDirectory(workingDirectory, agent)
      const parsed = parseRole(rawInput, roleNames)

      if (parsed.kind === 'list') {
        return {
          kind: 'success',
          text: listRoles({ cwd, rolesDir, projectRolesDir, roleNames }),
        }
      }

      if (parsed.kind === 'invalid') {
        return {
          kind: 'error',
          text: `Неизвестная роль «${parsed.role}». Доступны: ${roleNames.join(', ')}.`,
        }
      }

      try {
        const built = buildRoleText({
          role: parsed.role,
          cwd,
          rolesDir,
          projectRolesDir,
          roleNames,
        })
        const message = createUserMessage({
          content: [{ type: 'text', text: built.text }],
          source: { kind: 'user' },
        })

        if (typeof agent.followup === 'function') {
          agent.followup(message)
        } else if (typeof agent.inject === 'function') {
          agent.inject(message)
        } else {
          return {
            kind: 'error',
            text: 'Роль прочитана, но у агента нет followup/inject — передать правила в контекст не удалось.',
          }
        }

        const projectNote = built.projectMissing
          ? ` Проектного файла роли ${parsed.role} нет, работаю по общему слою.`
          : ''
        return {
          kind: 'success',
          text: `Роль ${parsed.role} загружена (${built.globalPath}${built.projectMissing ? '' : ` + ${built.projectPath}`}).${projectNote}`,
        }
      } catch (error) {
        logger?.warn?.('[dsh-harness] /role failed: %s', error?.message ?? error)
        return {
          kind: 'error',
          text: String(error?.message ?? error),
        }
      }
    },
  })
}