// src/main/services/VoiceCommandService.ts
// Phase 10.5: 음성 단축키 — 전사 텍스트에서 키워드를 감지하여 명령어 자동 선택.
// electron-store에 VoiceCommandRule[] 저장, 키워드 매칭 엔진 제공.

import { getLogger } from './LoggerService'
import { configGet, configSet } from './ConfigService'
import type {
  VoiceCommandRule,
  VoiceCommandKeyword,
  VoiceCommandMatch,
  KeywordMatchMode
} from '@d3ro/core/types'

const logger = getLogger('voice-command')

// ============================================================
// 기본 키워드 (프리셋 명령어용)
// ============================================================

interface DefaultKeywordEntry {
  instructionId: string
  keywords: VoiceCommandKeyword[]
  priority: number
}

const DEFAULT_KEYWORDS: ReadonlyArray<DefaultKeywordEntry> = [
  {
    instructionId: 'builtin-translate',
    keywords: [
      { keyword: '번역해줘', matchMode: 'prefix' },
      { keyword: '번역', matchMode: 'prefix' },
      { keyword: '영어로', matchMode: 'prefix' },
      { keyword: 'translate', matchMode: 'prefix' }
    ],
    priority: 0
  },
  {
    instructionId: 'builtin-summarize',
    keywords: [
      { keyword: '요약해줘', matchMode: 'prefix' },
      { keyword: '요약', matchMode: 'prefix' },
      { keyword: 'summarize', matchMode: 'prefix' }
    ],
    priority: 1
  },
  {
    instructionId: 'builtin-formal',
    keywords: [
      { keyword: '다듬어줘', matchMode: 'prefix' },
      { keyword: '다듬기', matchMode: 'prefix' },
      { keyword: 'polish', matchMode: 'prefix' }
    ],
    priority: 2
  },
  {
    instructionId: 'builtin-explain-code',
    keywords: [
      { keyword: '설명해줘', matchMode: 'prefix' },
      { keyword: '설명', matchMode: 'prefix' },
      { keyword: 'explain', matchMode: 'prefix' }
    ],
    priority: 3
  }
]

// ============================================================
// electron-store 키 (ConfigService와 별도 네임스페이스)
// ============================================================

const STORE_KEY_RULES: keyof import('@d3ro/core/types').AppConfig = 'voiceCommandRules'
const STORE_KEY_ENABLED: keyof import('@d3ro/core/types').AppConfig = 'voiceCommandsEnabled'

// ============================================================
// 키워드 매칭 엔진
// ============================================================

/**
 * 텍스트에서 키워드를 매칭하고, 매칭된 키워드를 제거한 정리된 텍스트를 반환한다.
 * 키워드 앞뒤의 공백/구두점 경계를 존중한다.
 */
function matchKeyword(
  text: string,
  keyword: string,
  mode: KeywordMatchMode
): { matched: boolean; cleanedText: string } {
  const trimmed = text.trim()
  const lowerText = trimmed.toLowerCase()
  const lowerKeyword = keyword.toLowerCase()

  if (lowerKeyword.length === 0) {
    return { matched: false, cleanedText: trimmed }
  }

  switch (mode) {
    case 'prefix': {
      if (!lowerText.startsWith(lowerKeyword)) {
        return { matched: false, cleanedText: trimmed }
      }
      // 키워드 뒤가 끝이거나 공백/구두점이어야 정확한 prefix 매칭
      const afterKeyword = trimmed.charAt(keyword.length)
      if (afterKeyword !== '' && !isWordBoundary(afterKeyword)) {
        return { matched: false, cleanedText: trimmed }
      }
      const cleaned = trimmed.slice(keyword.length).trimStart()
      return { matched: true, cleanedText: cleaned }
    }

    case 'suffix': {
      if (!lowerText.endsWith(lowerKeyword)) {
        return { matched: false, cleanedText: trimmed }
      }
      // 키워드 앞이 시작이거나 공백/구두점이어야 정확한 suffix 매칭
      const beforeKeyword = trimmed.charAt(trimmed.length - keyword.length - 1)
      if (beforeKeyword !== '' && !isWordBoundary(beforeKeyword)) {
        return { matched: false, cleanedText: trimmed }
      }
      const cleaned = trimmed.slice(0, trimmed.length - keyword.length).trimEnd()
      return { matched: true, cleanedText: cleaned }
    }

    case 'contains': {
      const index = lowerText.indexOf(lowerKeyword)
      if (index === -1) {
        return { matched: false, cleanedText: trimmed }
      }
      // contains 모드에서는 경계 검사 없이 첫 번째 매칭만 제거
      const before = trimmed.slice(0, index)
      const after = trimmed.slice(index + keyword.length)
      const cleaned = (before + after).replace(/\s{2,}/g, ' ').trim()
      return { matched: true, cleanedText: cleaned }
    }
  }
}

function isWordBoundary(char: string): boolean {
  // 공백, 구두점, 한국어 조사/어미 앞의 경계
  return /[\s,.!?;:'"()[\]{}\-/]/.test(char)
}

// ============================================================
// VoiceCommandService
// ============================================================

class VoiceCommandService {
  private rules: VoiceCommandRule[] = []
  private enabled = false
  private initialized = false

  initialize(): void {
    if (this.initialized) return

    this.loadRules()
    this.loadEnabled()
    this.initialized = true
    logger.info(
      `VoiceCommandService initialized (${this.rules.length} rules, enabled=${this.enabled})`
    )
  }

  /**
   * 전사 텍스트에서 키워드를 매칭하여 명령어를 자동 선택한다.
   * priority가 낮을수록 높은 우선순위 (0이 가장 높음).
   */
  match(text: string): VoiceCommandMatch {
    const noMatch: VoiceCommandMatch = {
      matched: false,
      ruleId: null,
      instructionId: null,
      cleanedText: text,
      matchedKeyword: null
    }

    if (!this.enabled) {
      return noMatch
    }

    const trimmed = text.trim()
    if (trimmed.length === 0) {
      return noMatch
    }

    // priority 오름차순 정렬 (낮은 값 = 높은 우선순위)
    const sortedRules = [...this.rules]
      .filter((r) => r.enabled && r.keywords.length > 0)
      .sort((a, b) => a.priority - b.priority)

    for (const rule of sortedRules) {
      for (const kw of rule.keywords) {
        const result = matchKeyword(trimmed, kw.keyword, kw.matchMode)
        if (result.matched) {
          logger.info(
            `Voice command matched: rule="${rule.id}", keyword="${kw.keyword}", instruction="${rule.instructionId}"`
          )
          return {
            matched: true,
            ruleId: rule.id,
            instructionId: rule.instructionId,
            cleanedText: result.cleanedText,
            matchedKeyword: kw.keyword
          }
        }
      }
    }

    return noMatch
  }

  getAllRules(): VoiceCommandRule[] {
    return [...this.rules].sort((a, b) => a.priority - b.priority)
  }

  setKeywordsForInstruction(instructionId: string, keywords: VoiceCommandKeyword[]): void {
    const existingIndex = this.rules.findIndex((r) => r.instructionId === instructionId)

    if (existingIndex !== -1) {
      // 기존 rule 업데이트
      this.rules[existingIndex] = {
        ...this.rules[existingIndex],
        keywords
      }
    } else {
      // 새 rule 생성
      const maxPriority = this.rules.reduce((max, r) => Math.max(max, r.priority), -1)
      this.rules.push({
        id: crypto.randomUUID(),
        instructionId,
        keywords,
        enabled: true,
        priority: maxPriority + 1
      })
    }

    this.saveRules()
    logger.info(
      `Keywords updated for instruction "${instructionId}": ${keywords.length} keywords`
    )
  }

  setEnabled(enabled: boolean): void {
    this.enabled = enabled
    this.saveEnabled()
    logger.info(`Voice commands ${enabled ? 'enabled' : 'disabled'}`)
  }

  isEnabled(): boolean {
    return this.enabled
  }

  /**
   * 최초 실행 시 기본 키워드를 생성한다.
   * 이미 rules가 존재하면 아무 것도 하지 않는다.
   */
  initDefaultKeywords(): void {
    if (this.rules.length > 0) {
      logger.debug('Default keywords already initialized, skipping')
      return
    }

    for (const entry of DEFAULT_KEYWORDS) {
      this.rules.push({
        id: crypto.randomUUID(),
        instructionId: entry.instructionId,
        keywords: [...entry.keywords],
        enabled: true,
        priority: entry.priority
      })
    }

    this.saveRules()
    logger.info(`Default voice command keywords initialized (${this.rules.length} rules)`)
  }

  dispose(): void {
    logger.info('VoiceCommandService disposed')
  }

  // ── Private ──────────────────────────────────────────

  private loadRules(): void {
    try {
      const stored = configGet(STORE_KEY_RULES) as VoiceCommandRule[] | undefined
      if (Array.isArray(stored) && stored.length > 0) {
        this.rules = stored
        return
      }
    } catch {
      // 첫 실행 시 키가 없을 수 있음
    }
    this.rules = []
  }

  private saveRules(): void {
    try {
      configSet(STORE_KEY_RULES, this.rules)
    } catch (error) {
      logger.warn(
        `Failed to save voice command rules: ${error instanceof Error ? error.message : String(error)}`
      )
    }
  }

  private loadEnabled(): void {
    try {
      const stored = configGet(STORE_KEY_ENABLED) as boolean | undefined
      this.enabled = stored === true
    } catch {
      this.enabled = false
    }
  }

  private saveEnabled(): void {
    try {
      configSet(STORE_KEY_ENABLED, this.enabled)
    } catch (error) {
      logger.warn(
        `Failed to save voice command enabled state: ${error instanceof Error ? error.message : String(error)}`
      )
    }
  }
}

// ============================================================
// 싱글턴
// ============================================================

let instance: VoiceCommandService | null = null

export function getVoiceCommandService(): VoiceCommandService {
  if (!instance) {
    instance = new VoiceCommandService()
  }
  return instance
}

export function resetVoiceCommandServiceForTests(): void {
  instance = null
}