// 技能与插件：调用 Claude Code 自带的 `claude plugin` 命令（以服务账号运行）安装和管理插件。
// 插件文件由 Claude Code 自己下载、存放和更新，AgentServer 只读取清单并在运行时按路径加载，
// 不复制、不修改插件内容（ADR-0013，满足官方技能许可证的要求）。
import fs from 'node:fs'
import path from 'node:path'
import type {
  AvailablePluginDto, InstalledPluginDto, LicenseKind, MarketplaceDto, PluginAction, PluginStateDto, SkillInfo,
} from '@agent-server/shared'
import { badRequest } from '../lib/errors'
import { frontmatter } from '../lib/skill-files'
import { listSkills, LOCAL_PLUGIN_FALLBACK, type PluginRef } from '../providers/claude/skills'
import { runClaudeCli } from '../providers/claude/cli'
import type { AuditService } from './catalog'
import type { SettingsService } from './settings'

const CACHE_MS = 60_000
const ACTION_TIMEOUT_MS = 300_000


interface RawInstalled { id: string; version?: string; enabled?: boolean; installPath: string; installedAt?: string; lastUpdated?: string }
interface RawAvailable { pluginId: string; name: string; description?: string; marketplaceName: string; version?: string }
interface RawMarketplace { name: string; source: string; path?: string; url?: string; repo?: string; installLocation?: string }

export class PluginService {
  private cache: { at: number; state: PluginStateDto } | null = null
  private queue: Promise<unknown> = Promise.resolve()

  constructor(private settings: SettingsService, private audit: AuditService) {}

  private get cli() {
    return this.settings.get().providers.claude.cliPath
  }

  async state(force = false): Promise<PluginStateDto> {
    if (!force && this.cache && Date.now() - this.cache.at < CACHE_MS) return this.cache.state
    const localSkills = readLocalSkills(this.settings.get().paths.skillsDir)
    try {
      const [list, mkts] = await Promise.all([
        runClaudeCli(this.cli, ['plugin', 'list', '--json', '--available'], { timeoutMs: 60_000 }),
        runClaudeCli(this.cli, ['plugin', 'marketplace', 'list', '--json'], { timeoutMs: 60_000 }),
      ])
      const parsed = parseJson<{ installed: RawInstalled[]; available: RawAvailable[] }>(list.stdout) ?? { installed: [], available: [] }
      const installed = parsed.installed.map(toInstalled)
      const installedIds = new Set(installed.map(p => p.id))
      const state: PluginStateDto = {
        cliPath: this.cli,
        installed,
        available: parsed.available.map(a => ({
          pluginId: a.pluginId, name: a.name, description: a.description ?? '', marketplaceName: a.marketplaceName,
          version: a.version ?? null, installed: installedIds.has(a.pluginId),
        }) satisfies AvailablePluginDto),
        marketplaces: (parseJson<RawMarketplace[]>(mkts.stdout) ?? []).map(m => ({
          name: m.name, source: m.source, location: m.repo ?? m.url ?? m.path ?? m.installLocation ?? null,
        }) satisfies MarketplaceDto),
        localSkills,
        error: list.code === 0 ? null : (list.stderr || list.stdout).trim().slice(-500),
      }
      this.cache = { at: Date.now(), state }
      return state
    } catch (err) {
      return { cliPath: this.cli, installed: [], available: [], marketplaces: [], localSkills, error: (err as Error).message }
    }
  }

  /** 运行时加载：已安装且已启用的插件 */
  async loadable(): Promise<PluginRef[]> {
    const s = await this.state()
    return s.installed.filter(p => p.enabled && fs.existsSync(p.installPath)).map(p => {
      const loadName = manifestName(p.installPath) ?? path.basename(p.installPath)
      return { name: loadName, path: p.installPath, skills: p.skills.map(k => ({ id: k.id, loadId: `${loadName}:${k.name}` })) }
    })
  }

  /** 后台可选的全部技能：本地技能目录 + 已启用插件中的技能 */
  async skills(): Promise<SkillInfo[]> {
    const s = await this.state()
    return [...s.localSkills, ...s.installed.filter(p => p.enabled).flatMap(p => p.skills)]
  }

  /** 串行执行插件命令，避免并发修改 Claude Code 的插件配置 */
  act(a: PluginAction): Promise<{ message: string; state: PluginStateDto }> {
    const run = async () => {
      const args = actionArgs(a)
      const r = await runClaudeCli(this.cli, ['plugin', ...args, '--json'], { timeoutMs: ACTION_TIMEOUT_MS })
      const line = r.stdout.trim().split('\n').reverse().map(l => parseJson<{ outcome?: string; message?: string }>(l)).find(Boolean)
      const ok = line ? line.outcome === 'ok' : r.code === 0
      const message = line?.message ?? (r.stderr || r.stdout).trim().slice(-500)
      this.audit.log({ actor: 'admin', kind: 'admin', summary: `插件操作 ${args.join(' ')}：${ok ? '成功' : '失败'}`, detail: { message } })
      if (!ok) throw badRequest(message || '操作失败')
      return { message, state: await this.state(true) }
    }
    const p = this.queue.then(run, run)
    this.queue = p.catch(() => {})
    return p
  }
}

function actionArgs(a: PluginAction): string[] {
  const id = /^[\w.@/:+-]+$/
  switch (a.action) {
    case 'marketplace-add':
      if (!/^[\w.@/:~+-]+$/.test(a.source)) throw badRequest('市场来源格式不正确')
      return ['marketplace', 'add', a.source]
    case 'marketplace-remove': case 'marketplace-update':
      if (!id.test(a.name)) throw badRequest('市场名称格式不正确')
      return ['marketplace', a.action === 'marketplace-remove' ? 'remove' : 'update', a.name]
    default:
      if (!id.test(a.plugin)) throw badRequest('插件 ID 格式不正确')
      return [a.action, a.plugin]
  }
}

function toInstalled(r: RawInstalled): InstalledPluginDto {
  const [name = r.id, marketplace = ''] = r.id.split('@')
  const rootLicense = detectLicense(r.installPath)
  const skills = readSkills(path.join(r.installPath, 'skills'), name, 'plugin', rootLicense.kind, declaredSkills(r.installPath, name))
  // 仓库根目录可能是开源许可，而单个技能是专有许可：任一技能受限即视为受限插件
  const restricted = skills.find(k => k.license === 'restricted')
  const license = restricted && rootLicense.kind !== 'restricted' ? RESTRICTED : rootLicense
  return {
    id: r.id, name, marketplace, version: r.version ?? null, enabled: r.enabled !== false, installPath: r.installPath,
    installedAt: r.installedAt ?? null, lastUpdated: r.lastUpdated ?? null, license, skills,
  }
}

function readLocalSkills(skillsDir: string): SkillInfo[] {
  let plugin = LOCAL_PLUGIN_FALLBACK
  try {
    plugin = (JSON.parse(fs.readFileSync(path.join(skillsDir, '.claude-plugin/plugin.json'), 'utf8')) as { name: string }).name
  } catch {
    return []
  }
  return listSkills(skillsDir).length ? readSkills(path.join(skillsDir, 'skills'), plugin, 'local', 'open') : []
}

function readSkills(dir: string, plugin: string, source: SkillInfo['source'], pluginLicense: LicenseKind, only: Set<string> | null = null): SkillInfo[] {
  let entries: fs.Dirent[]
  try {
    entries = fs.readdirSync(dir, { withFileTypes: true })
  } catch {
    return []
  }
  return entries.filter(e => e.isDirectory() && (!only || only.has(e.name)) && fs.existsSync(path.join(dir, e.name, 'SKILL.md'))).map(e => {
    const fm = frontmatter(fs.readFileSync(path.join(dir, e.name, 'SKILL.md'), 'utf8'))
    const own = detectLicense(path.join(dir, e.name)).kind
    return {
      id: `${plugin}:${fm.name ?? e.name}`, name: fm.name ?? e.name, description: fm.description ?? '', plugin, source,
      license: own === 'unknown' ? pluginLicense : own,
    }
  }).sort((a, b) => a.name.localeCompare(b.name))
}

/** 插件自带 plugin.json 时的名称（按路径加载时 CLI 用它作为技能前缀） */
function manifestName(installPath: string): string | null {
  try {
    return (JSON.parse(fs.readFileSync(path.join(installPath, '.claude-plugin/plugin.json'), 'utf8')) as { name?: string }).name ?? null
  } catch {
    return null
  }
}

/**
 * 市场清单中为该插件声明的技能子集。例如官方仓库的 document-skills 与 example-skills 共用同一个目录，
 * 分别只声明了部分技能（strict: false）。没有声明时返回 null，表示 skills/ 下全部技能。
 */
function declaredSkills(installPath: string, plugin: string): Set<string> | null {
  try {
    const m = JSON.parse(fs.readFileSync(path.join(installPath, '.claude-plugin/marketplace.json'), 'utf8')) as { plugins?: { name: string; skills?: string[] }[] }
    const entry = m.plugins?.find(p => p.name === plugin)
    return entry?.skills?.length ? new Set(entry.skills.map(s => path.basename(s))) : null
  } catch {
    return null
  }
}


/** 识别许可证：Anthropic 专有许可（源码可见、仅限在其服务内使用）或常见开源许可 */
function detectLicense(dir: string): { kind: LicenseKind; summary: string | null } {
  let text = ''
  try {
    const f = fs.readdirSync(dir).find(n => /^licen[cs]e/i.test(n))
    if (f) text = fs.readFileSync(path.join(dir, f), 'utf8').slice(0, 4000)
  } catch {
    return { kind: 'unknown', summary: null }
  }
  if (!text) return { kind: 'unknown', summary: null }
  if (/agreement\s+with\s+Anthropic/i.test(text) || /All rights reserved/i.test(text)) {
    return RESTRICTED
  }
  if (/Apache License|MIT License|BSD|Mozilla Public License|ISC License/i.test(text)) return { kind: 'open', summary: '开源许可' }
  return { kind: 'unknown', summary: null }
}

const RESTRICTED = {
  kind: 'restricted' as const,
  summary: 'Anthropic 专有许可：只能在 Anthropic 的服务（Claude Code）中使用；不得复制到服务之外、修改或分发',
}

function parseJson<T>(s: string): T | null {
  try {
    return JSON.parse(s) as T
  } catch {
    return null
  }
}