import {octokit} from './octokit'
import {als} from './context'
import {feedbackTracker} from './feedback-tracker'
import {PatternCategory} from './feedback-types'
import { LRUCache } from 'lru-cache'
import pino from 'pino'

const logger = pino({ level: process.env.LOG_LEVEL || 'info' })

const FEEDBACK_TAG = '<!-- prix_feedback_tracking -->'

export interface CommentMetadata {
  commentId?: number
  pullNumber: number
  path: string
  patternType: PatternCategory
  severity: 'critical' | 'major' | 'minor' | 'info'
  confidence: number
}

export class FeedbackCapture {
  // SECURITY: LRU caches prevent unbounded memory growth (Issue #5)
  private commentMetadata: LRUCache<string, CommentMetadata>
  private pendingFeedback: LRUCache<string, 'accepted' | 'rejected'>

  constructor() {
    // Limit to 1000 entries per PR with 1 hour TTL
    this.commentMetadata = new LRUCache<string, CommentMetadata>({
      max: 1000,
      ttl: 1000 * 60 * 60, // 1 hour
      updateAgeOnGet: true,
      dispose: (value, key) => {
        logger.debug({ key, pullNumber: value.pullNumber }, 'Comment metadata evicted')
      }
    })

    this.pendingFeedback = new LRUCache<string, 'accepted' | 'rejected'>({
      max: 1000,
      ttl: 1000 * 60 * 60, // 1 hour
      updateAgeOnGet: true
    })
  }

  private getCommentKey(
    pullNumber: number,
    path: string,
    startLine: number
  ): string {
    return `${pullNumber}:${path}:${startLine}`
  }

  trackComment(
    pullNumber: number,
    path: string,
    startLine: number,
    patternType: PatternCategory,
    severity: 'critical' | 'major' | 'minor' | 'info',
    confidence: number,
    commentId?: number
  ): void {
    const key = this.getCommentKey(pullNumber, path, startLine)
    this.commentMetadata.set(key, {
      commentId,
      pullNumber,
      path,
      patternType,
      severity,
      confidence
    })
  }

  async checkSuggestionApplied(
    pullNumber: number,
    path: string,
    startLine: number
  ): Promise<boolean> {
    const key = this.getCommentKey(pullNumber, path, startLine)
    const metadata = this.commentMetadata.get(key)
    if (!metadata || !metadata.commentId) return false

    try {
      const comments = await octokit.rest.pulls.listReviewComments({
        owner: als.getStore()?.repo.owner || '',
        repo: als.getStore()?.repo.repo || '',
        // eslint-disable-next-line camelcase
        pull_number: pullNumber
      })

      const originalComment = comments.data.find(
        (c: any) => c.id === metadata.commentId
      )

      if (!originalComment) return false

      const diff = await this.getFileDiffAtComment(
        pullNumber,
        path,
        startLine,
        originalComment.original_line || startLine
      )

      const hasAppliedSuggestion = this.detectSuggestionApplication(
        originalComment.body || '',
        diff
      )

      if (hasAppliedSuggestion) {
        this.recordFeedback(key, 'accepted')
      }

      return hasAppliedSuggestion
    } catch (e) {
      logger.warn({ error: e }, 'Failed to check suggestion application')
      return false
    }
  }

  private async getFileDiffAtComment(
    pullNumber: number,
    path: string,
    startLine: number,
    originalLine: number
  ): Promise<string> {
    try {
      const diff = await octokit.rest.repos.compareCommits({
        owner: als.getStore()?.repo.owner || '',
        repo: als.getStore()?.repo.repo || '',
        base: `${pullNumber}-base`,
        head: `${pullNumber}-head`
      })

      const file = diff.data.files?.find((f: any) => f.filename === path)
      if (!file?.patch) return ''

      const hunk = file.patch
        .split('\n')
        .slice(
          Math.max(0, originalLine - startLine - 1),
          originalLine - startLine + 5
        )
        .join('\n')

      return hunk
    } catch (e) {
      return ''
    }
  }

  private detectSuggestionApplication(
    originalBody: string,
    currentDiff: string
  ): boolean {
    if (!originalBody.includes('```suggestion')) return false
    if (!currentDiff) return false

    const suggestionMatch = originalBody.match(/```suggestion\n([\s\S]*?)```/)
    if (!suggestionMatch) return false

    const suggestedCode = suggestionMatch[1].trim()
    const hasApplied = currentDiff.includes(
      suggestedCode.substring(0, Math.min(50, suggestedCode.length))
    )

    return hasApplied
  }

  recordFeedback(key: string, type: 'accepted' | 'rejected'): void {
    const metadata = this.commentMetadata.get(key)
    if (!metadata) return

    this.pendingFeedback.set(key, type)

    const ctx = als.getStore()
    const teamId = ctx?.repo?.owner || 'default'
    const repoSlug = ctx?.repo?.repo || 'default'

    feedbackTracker.recordFeedback({
      patternType: metadata.patternType,
      severity: metadata.severity,
      filenamePattern: metadata.path,
      repoSlug,
      teamId,
      confidence: metadata.confidence,
      feedbackType: type
    })

    logger.info({ key, type }, 'Feedback recorded')
  }

  async checkReactionFeedback(pullNumber: number): Promise<void> {
    const ctx = als.getStore()
    const teamId = ctx?.repo?.owner || 'default'
    const repoSlug = ctx?.repo?.repo || 'default'

    try {
      const comments = await octokit.rest.pulls.listReviewComments({
        owner: teamId,
        repo: repoSlug,
        // eslint-disable-next-line camelcase
        pull_number: pullNumber
      })

      for (const comment of comments.data) {
        if (!comment.body?.includes(FEEDBACK_TAG)) continue

        const reactions = await octokit.rest.reactions.listForIssueComment({
          owner: teamId,
          repo: repoSlug,
          // eslint-disable-next-line camelcase
          comment_id: comment.id
        })

        for (const reaction of reactions.data) {
          const key = this.getCommentKey(
            pullNumber,
            comment.path || '',
            comment.line || comment.original_line || 0
          )

          if (reaction.content === '+1' || reaction.content === 'heart') {
            this.recordFeedback(key, 'accepted')
          } else if (reaction.content === '-1' || reaction.content === 'eyes') {
            this.recordFeedback(key, 'rejected')
          }
        }
      }
    } catch (e) {
      logger.warn({ error: e }, 'Failed to check reaction feedback')
    }
  }

  async trackReviewSubmission(
    pullNumber: number,
    reviewId: number,
    commitId: string
  ): Promise<void> {
    const ctx = als.getStore()
    const teamId = ctx?.repo?.owner || 'default'
    const repoSlug = ctx?.repo?.repo || 'default'

    logger.info(
      { pullNumber, reviewId },
      'Tracking review submission'
    )

    try {
      const comments = await octokit.rest.pulls.listReviewComments({
        owner: teamId,
        repo: repoSlug,
        // eslint-disable-next-line camelcase
        pull_number: pullNumber
      })

      for (const comment of comments.data) {
        if (!comment.body?.includes(FEEDBACK_TAG)) continue
        if (comment.user?.login !== 'github-actions[bot]') continue

        const metadataMatch = comment.body.match(/data-pattern="([^"]+)"/)
        const severityMatch = comment.body.match(/data-severity="([^"]+)"/)
        const confidenceMatch = comment.body.match(/data-confidence="([^"]+)"/)

        if (metadataMatch && severityMatch && confidenceMatch) {
          const key = this.getCommentKey(
            pullNumber,
            comment.path || '',
            comment.line || comment.original_line || 0
          )

          this.commentMetadata.set(key, {
            commentId: comment.id,
            pullNumber,
            path: comment.path || '',
            patternType: metadataMatch[1] as PatternCategory,
            severity: severityMatch[1] as
              | 'critical'
              | 'major'
              | 'minor'
              | 'info',
            confidence: parseFloat(confidenceMatch[1])
          })
        }
      }
    } catch (e) {
      logger.warn({ error: e }, 'Failed to track review submission')
    }
  }

  getFeedbackStats(teamId: string, repoSlug: string) {
    return feedbackTracker.getTeamInsights(teamId, repoSlug)
  }

  shouldSuppressFinding(
    patternType: PatternCategory,
    filename: string,
    teamId: string,
    repoSlug: string
  ): boolean {
    return feedbackTracker.shouldSuppressPattern(patternType, teamId, repoSlug)
  }
}

export const feedbackCapture = new FeedbackCapture()