import type { HttpContext } from '@adonisjs/core/http'
import Auction from '#models/auction'
import ParseLog from '#models/parse_log'
import { errors as lucidErrors } from '@adonisjs/lucid'
import { DateTime } from 'luxon'
import { ScraperService } from '#services/scraper_service'
import { NotificationService } from '#services/notification_service'
import logger from '@adonisjs/core/services/logger'

export default class AuctionsController {
  /**
   * List auctions with pagination
   * GET /api/auctions?page=1&limit=20
   */
  async index({ request, response }: HttpContext) {
    const page = request.input('page', 1)
    const limit = request.input('limit', 20)

    const pageNumber = Math.max(1, Number(page))
    const limitNumber = Math.min(100, Math.max(1, Number(limit)))

    try {
      const auctions = await Auction.query()
        .orderBy('created_at', 'desc')
        .paginate(pageNumber, limitNumber)

      return response.ok(auctions.serialize())
    } catch (error) {
      return response.internalServerError({
        error: 'Failed to fetch auctions',
        message: error instanceof Error ? error.message : 'Unknown error',
      })
    }
  }

  /**
   * Get a single auction by id with relationships
   * GET /api/auctions/:id
   */
  async show({ params, response }: HttpContext) {
    const auctionId = params.id

    if (!auctionId || isNaN(Number(auctionId))) {
      return response.badRequest({
        error: 'Invalid auction id',
      })
    }

    try {
      const auction = await Auction.query()
        .where('id', auctionId)
        .preload('notifications')
        .firstOrFail()

      return response.ok(auction.serialize())
    } catch (error) {
      if (error instanceof lucidErrors.E_ROW_NOT_FOUND) {
        return response.notFound({
          error: 'Auction not found',
        })
      }

      return response.internalServerError({
        error: 'Failed to fetch auction',
        message: error instanceof Error ? error.message : 'Unknown error',
      })
    }
  }

  /**
   * Search auctions by keyword/title/status
   * GET /api/auctions/search?q=keyword&status=active&page=1&limit=20
   */
  async search({ request, response }: HttpContext) {
    const searchQuery = request.input('q', '')
    const status = request.input('status')
    const page = request.input('page', 1)
    const limit = request.input('limit', 20)

    const pageNumber = Math.max(1, Number(page))
    const limitNumber = Math.min(100, Math.max(1, Number(limit)))

    try {
      const query = Auction.query()

      if (searchQuery && typeof searchQuery === 'string' && searchQuery.trim().length > 0) {
        const trimmedQuery = searchQuery.trim()
        query.where((builder) => {
          builder
            .whereILike('title', `%${trimmedQuery}%`)
            .orWhereILike('description', `%${trimmedQuery}%`)
            .orWhereILike('auction_num', `%${trimmedQuery}%`)
            .orWhereILike('organization', `%${trimmedQuery}%`)
        })
      }

      if (status && typeof status === 'string' && status.trim().length > 0) {
        query.where('status', status.trim())
      }

      const auctions = await query.orderBy('created_at', 'desc').paginate(pageNumber, limitNumber)

      return response.ok(auctions.serialize())
    } catch (error) {
      return response.internalServerError({
        error: 'Failed to search auctions',
        message: error instanceof Error ? error.message : 'Unknown error',
      })
    }
  }

  /**
   * List all auctions from last 3 days
   * GET /list
   */
  async list({ response }: HttpContext) {
    try {
      const threeDaysAgo = DateTime.now().minus({ days: 3 })

      const auctions = await Auction.query()
        .where('created_at', '>=', threeDaysAgo.toSQL())
        .orderBy('created_at', 'desc')

      return response.ok({
        data: auctions.map((auction) => auction.serialize()),
        meta: {
          total: auctions.length,
          from_date: threeDaysAgo.toISO(),
        },
      })
    } catch (error) {
      return response.internalServerError({
        error: 'Failed to fetch recent auctions',
        message: error instanceof Error ? error.message : 'Unknown error',
      })
    }
  }

  /**
   * Render HTML view of auctions from last 3 days
   * GET /list-view
   */
  async listView({ view }: HttpContext) {
    const threeDaysAgo = DateTime.now().minus({ days: 3 })

    const auctions = await Auction.query()
      .where('created_at', '>=', threeDaysAgo.toSQL())
      .orderBy('created_at', 'desc')

    return view.render('auctions/list', {
      auctions,
      fromDate: threeDaysAgo.toFormat('dd.MM.yyyy HH:mm'),
    })
  }

  /**
   * Trigger auction parsing from web interface
   * POST /trigger-parse
   */
  async triggerParse({ request, response, session }: HttpContext) {
    try {
      // Validate input
      const pages = request.input('pages', 1)
      const notifySubscribers = request.input('notifySubscribers') === 'on'

      const pagesNumber = Math.max(1, Math.min(10, Number(pages)))

      if (isNaN(pagesNumber)) {
        session.flash('error', 'Invalid number of pages')
        return response.redirect('/list-view')
      }

      logger.info(`Parsing triggered from web interface`, {
        pages: pagesNumber,
        notifySubscribers,
      })

      const startTime = DateTime.now()
      const scraper = new ScraperService()
      const notificationService = new NotificationService()

      // Create ParseLog entry
      const parseLog = await ParseLog.create({
        parseType: 'auction',
        status: 'running',
        itemsFound: 0,
        errors: null,
        startedAt: startTime,
        completedAt: null,
      })

      let newAuctions = 0
      let updatedAuctions = 0
      let totalScraped = 0
      const errors: string[] = []

      // Step 1: Scrape auctions
      logger.info(`Scraping ${pagesNumber} page(s) from icetrade.by`)
      const auctionData = await scraper.scrapeAuctions(pagesNumber)
      totalScraped = auctionData.length

      if (totalScraped === 0) {
        await this.updateParseLog(parseLog, 'completed', 0, null)
        session.flash('error', 'No auctions found during parsing')
        return response.redirect('/list-view')
      }

      // Step 2: Upsert auctions to database
      logger.info(`Saving ${totalScraped} auction(s) to database`)

      for (const data of auctionData) {
        try {
          // Check if auction exists by auctionNum
          const existingAuction = await Auction.query()
            .where('auctionNum', data.auctionNum)
            .first()

          let auction: Auction

          if (existingAuction) {
            // Update existing auction
            existingAuction.title = data.title
            existingAuction.description = data.description
            existingAuction.organization = data.organization
            existingAuction.status = data.status
            existingAuction.deadline = data.deadline ? DateTime.fromISO(data.deadline) : null
            existingAuction.url = data.link
            existingAuction.rawData = data

            await existingAuction.save()
            auction = existingAuction
            updatedAuctions++

            logger.debug(`Updated auction: ${data.auctionNum}`)
          } else {
            // Create new auction
            auction = await Auction.create({
              auctionNum: data.auctionNum,
              title: data.title,
              description: data.description,
              organization: data.organization,
              status: data.status,
              price: null,
              deadline: data.deadline ? DateTime.fromISO(data.deadline) : null,
              url: data.link,
              rawData: data,
            })

            newAuctions++
            logger.debug(`Created auction: ${data.auctionNum}`)

            // Step 3: Check for keyword matches and send notifications (for new auctions only)
            if (notifySubscribers) {
              try {
                await notificationService.checkAndNotify(auction)
              } catch (error) {
                const errorMsg = `Notification check failed for auction ${data.auctionNum}: ${error instanceof Error ? error.message : String(error)}`
                logger.error(errorMsg)
                errors.push(errorMsg)
                // Don't fail the entire process if notification fails
              }
            }
          }
        } catch (error) {
          const errorMsg = `Failed to save auction ${data.auctionNum}: ${error instanceof Error ? error.message : String(error)}`
          logger.error(errorMsg)
          errors.push(errorMsg)
        }
      }

      // Update ParseLog with success status
      const status = errors.length > 0 ? 'completed_with_errors' : 'completed'
      await this.updateParseLog(
        parseLog,
        status,
        newAuctions + updatedAuctions,
        errors.length > 0 ? errors.join('\n') : null
      )

      // Create success message
      let successMessage = `Parsing completed: ${totalScraped} auctions scraped, ${newAuctions} new, ${updatedAuctions} updated`

      if (!notifySubscribers) {
        successMessage += ' (notifications disabled)'
      }

      if (errors.length > 0) {
        successMessage += ` with ${errors.length} error(s)`
      }

      session.flash('success', successMessage)
      logger.info(successMessage)

      return response.redirect('/list-view')
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : 'Unknown error during parsing'

      logger.error('Error in triggerParse', {
        error: errorMessage,
      })

      session.flash('error', `Parsing failed: ${errorMessage}`)
      return response.redirect('/list-view')
    }
  }

  /**
   * Update ParseLog entry with final status
   */
  private async updateParseLog(
    parseLog: ParseLog,
    status: string,
    itemsFound: number,
    errors: string | null
  ): Promise<void> {
    parseLog.status = status
    parseLog.itemsFound = itemsFound
    parseLog.errors = errors
    parseLog.completedAt = DateTime.now()
    await parseLog.save()

    logger.info(`Updated ParseLog ${parseLog.id}: status=${status}, items=${itemsFound}`)
  }
}