/**
 * dsh-harness — the DeepSeek Harness adapter for claude-harness.
 *
 * Three Claude Code integration points are replaced by Cordis hooks:
 *   - PreToolUse Edit/Write/Bash  -> `ctx.tools.guard` calling the existing
 *     `hooks/guard-main.sh` and `hooks/require-plan.sh` through a thin adapter;
 *   - SessionStart superpowers    -> `agent/pre-step` injecting
 *     `using-superpowers` once per session (and again after compaction);
 *   - `/role` skill               -> a real `/role` command registering on
 *     `ctx.commands`.
 *
 * Everything else (CLAUDE.md, roles, OpenSpec, Gitea, codegraph, project
 * templates) stays in the repository and is consumed as ordinary files.
 *
 * The bundle intentionally has no `@deepseek-ai/*` imports: a local-directory
 * profile install resolves imports from the profile, not from the DSH
 * installation, so only Node builtins and files in this package are safe.
 */

import { existsSync } from 'node:fs'
import { homedir } from 'node:os'
import { dirname, join } from 'node:path'
import { fileURLToPath } from 'node:url'
import { registerRoleCommand } from './command-role.js'
import { createGuard } from './lib/guards.js'
import { isBootstrapVisible, prepareBootstrap } from './lib/bootstrap.js'
import { createUserMessage } from './lib/message.js'
import { DEFAULT_ROLE_NAMES } from './lib/role.js'

export const name = 'dsh-harness'
export const inject = ['tools', 'workingDirectory']

/** Resolve the hook directory for both a linked checkout and a packed package. */
function resolveHooksDir(bundleDir, configured) {
  if (configured) return configured
  const local = join(bundleDir, 'hooks')
  if (existsSync(join(local, 'guard-main.sh'))) return local
  return join(bundleDir, '..', '..', 'hooks')
}

/** Prefer DSH-installed roles, then Claude Code, then the repository source. */
export function resolveRolesDir(bundleDir, configured, home = homedir()) {
  if (configured) return configured
  const dshInstalled = join(home, '.dsh', 'roles')
  if (existsSync(join(dshInstalled, 'dev.md'))) return dshInstalled
  const claudeInstalled = join(home, '.claude', 'roles')
  if (existsSync(join(claudeInstalled, 'dev.md'))) return claudeInstalled
  const source = join(bundleDir, '..', '..', 'roles')
  if (existsSync(join(source, 'dev.md'))) return source
  return dshInstalled
}


function isSubagent(agent) {
  if (!agent) return false
  if (agent.parent || agent.parentAgent || agent.parentSessionId) return true
  if (typeof agent.depth === 'number' && agent.depth > 0) return true
  return false
}

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

const DEFAULTS = {
  enabled: true,
  guards: true,
  bootstrap: true,
  bootstrapSubagents: false,
  roleCommand: true,
  hooksDir: '',
  rolesDir: '',
  projectRolesDir: '',
  roleNames: DEFAULT_ROLE_NAMES,
  bootstrapSkillPath: '',
  toolMappingPath: '',
  bootstrapMaxBytes: 65_536,
}

export function apply(ctx, rawConfig = {}) {
  const config = { ...DEFAULTS, ...(rawConfig ?? {}) }
  if (!Array.isArray(config.roleNames) || config.roleNames.length === 0) {
    config.roleNames = DEFAULT_ROLE_NAMES
  }
  const bundleDir = dirname(fileURLToPath(import.meta.url))
  const hooksDir = resolveHooksDir(bundleDir, config.hooksDir)
  const rolesDir = resolveRolesDir(bundleDir, config.rolesDir)
  const guard = createGuard({ hooksDir, logger: ctx.logger })

  if (config.enabled && config.guards) {
    // A synchronous, monotonic guard: it runs after the extensible
    // `tools/pre-execute` waterfall, so no other listener can turn a denial
    // back into permission.
    ctx.tools.guard((exec) => {
      const reason = guard.check(exec, sessionCwd(ctx.workingDirectory, exec.agent))
      if (reason !== undefined) {
        ctx.logger?.info?.('[dsh-harness] blocked %s: %s', exec.name, reason.split('\n')[0])
      }
      return reason
    })
  }

  if (config.enabled && config.bootstrap) {
    ctx.on('agent/pre-step', async ({ agent, signal }, next) => {
      const decision = await next()
      if (decision.kind === 'reject' || signal?.aborted) return decision
      if (!config.bootstrapSubagents && isSubagent(agent)) return decision

      const prepared = prepareBootstrap({
        skillPath: config.bootstrapSkillPath,
        mappingPath: config.toolMappingPath || join(bundleDir, 'dsh-tools.md'),
        maxBytes: config.bootstrapMaxBytes,
        logger: ctx.logger,
      })
      if (!prepared) return decision
      if (isBootstrapVisible(agent, decision.messages, prepared.marker)) return decision

      return {
        ...decision,
        messages: [
          ...(decision.messages ?? []),
          createUserMessage({
            content: [{ type: 'text', text: prepared.text }],
            source: { kind: 'user' },
          }),
        ],
      }
    })
  }

  if (config.enabled && config.roleCommand) {
    ctx.inject(['commands'], (commandCtx) => {
      registerRoleCommand({
        commands: commandCtx.commands,
        workingDirectory: ctx.workingDirectory,
        rolesDir,
        projectRolesDir: config.projectRolesDir,
        roleNames: config.roleNames,
        logger: ctx.logger,
      })
    })
  }

  ctx.logger?.info?.(
    '[dsh-harness] ready: hooks=%s, bootstrap=%s, /role=%s',
    config.guards ? hooksDir : 'off',
    config.bootstrap ? 'on' : 'off',
    config.roleCommand ? 'on' : 'off',
  )
}