const { getRedisClient } = require("./client")
const prisma = require("../../db/client")
const voteDb = require("../../db/vote.db")
const commentLikeDb = require("../../db/commentLike.db")
const dealAnalyticsDb = require("../../db/dealAnalytics.db")
const dealSaveDb = require("../../db/dealSave.db")

const VOTE_HASH_KEY = "bull:dbsync:votes"
const COMMENT_LIKE_HASH_KEY = "bull:dbsync:commentLikes"
const COMMENT_HASH_KEY = "bull:dbsync:comments"
const COMMENT_DELETE_HASH_KEY = "bull:dbsync:commentDeletes"
const DEAL_UPDATE_HASH_KEY = "bull:dbsync:dealUpdates"
const DEAL_CREATE_HASH_KEY = "bull:dbsync:dealCreates"
const DEAL_AI_REVIEW_HASH_KEY = "bull:dbsync:dealAiReviews"
const NOTIFICATION_HASH_KEY = "bull:dbsync:notifications"
const NOTIFICATION_READ_HASH_KEY = "bull:dbsync:notificationReads"
const DEAL_SAVE_HASH_KEY = "bull:dbsync:dealSaves"
const AUDIT_HASH_KEY = "bull:dbsync:audits"
const USER_UPDATE_HASH_KEY = "bull:dbsync:users"
const USER_NOTE_HASH_KEY = "bull:dbsync:userNotes"
const DEAL_REPORT_UPDATE_HASH_KEY = "bull:dbsync:dealReportUpdates"
const CATEGORY_UPSERT_HASH_KEY = "bull:dbsync:categoryUpserts"
const SELLER_UPSERT_HASH_KEY = "bull:dbsync:sellerUpserts"
const SELLER_DOMAIN_UPSERT_HASH_KEY = "bull:dbsync:sellerDomainUpserts"
const DEAL_ANALYTICS_TOTAL_HASH_KEY = "bull:dbsync:dealAnalyticsTotals"

function createRedisClient() {
  return getRedisClient()
}

async function tryQueue({ redisAction, fallbackAction, label }) {
  try {
    await redisAction()
    return { queued: true }
  } catch (err) {
    if (fallbackAction) {
      try {
        await fallbackAction()
        return { queued: false, fallback: true }
      } catch (fallbackErr) {
        console.error(`[dbsync-fallback] ${label || "unknown"} failed:`, fallbackErr?.message || fallbackErr)
      }
    }
    console.error(`[dbsync-queue] ${label || "unknown"} failed:`, err?.message || err)
    return { queued: false, fallback: false }
  }
}

const DEAL_UPDATE_FIELDS = new Set([
  "title",
  "description",
  "url",
  "price",
  "originalPrice",
  "shippingPrice",
  "couponCode",
  "location",
  "discountType",
  "discountValue",
  "barcodeId",
  "maxNotifiedMilestone",
  "status",
  "saletype",
  "affiliateType",
  "sellerId",
  "customSeller",
  "categoryId",
  "userId",
])

function sanitizeDealUpdate(data) {
  const patch = {}
  if (!data || typeof data !== "object") return patch
  for (const [key, value] of Object.entries(data)) {
    if (!DEAL_UPDATE_FIELDS.has(key)) continue
    patch[key] = value
  }
  return patch
}

function normalizeDealCreateData(data = {}) {
  return {
    id: Number(data.id),
    title: String(data.title || ""),
    description: data.description ?? null,
    url: data.url ?? null,
    price: data.price ?? null,
    originalPrice: data.originalPrice ?? null,
    shippingPrice: data.shippingPrice ?? null,
    percentOff: data.percentOff ?? null,
    couponCode: data.couponCode ?? null,
    location: data.location ?? null,
    discountType: data.discountType ?? null,
    discountValue: data.discountValue ?? null,
    barcodeId: data.barcodeId ?? null,
    maxNotifiedMilestone: Number.isFinite(Number(data.maxNotifiedMilestone))
      ? Number(data.maxNotifiedMilestone)
      : 0,
    userId: Number(data.userId),
    status: String(data.status || "PENDING"),
    saletype: String(data.saletype || "ONLINE"),
    affiliateType: String(data.affiliateType || "NON_AFFILIATE"),
    sellerId: data.sellerId ? Number(data.sellerId) : null,
    customSeller: data.customSeller ?? null,
    categoryId: Number.isInteger(Number(data.categoryId)) ? Number(data.categoryId) : 0,
    createdAt: data.createdAt ? new Date(data.createdAt) : new Date(),
    updatedAt: data.updatedAt ? new Date(data.updatedAt) : new Date(),
  }
}

async function queueVoteUpdate({ dealId, userId, voteType, createdAt }) {
  if (!dealId || !userId) return
  const redis = createRedisClient()

  const field = `vote:${dealId}:${userId}`
  const payload = JSON.stringify({
    dealId: Number(dealId),
    userId: Number(userId),
    voteType: Number(voteType),
    createdAt,
  })

  await tryQueue({
    label: "vote",
    redisAction: () => redis.hset(VOTE_HASH_KEY, field, payload),
    fallbackAction: () =>
      voteDb.voteDealTx({
        dealId: Number(dealId),
        userId: Number(userId),
        voteType: Number(voteType),
        createdAt,
      }),
  })
}

async function queueCommentLikeUpdate({ commentId, userId, like, createdAt }) {
  if (!commentId || !userId) return
  const redis = createRedisClient()

  const field = `commentLike:${commentId}:${userId}`
  const payload = JSON.stringify({
    commentId: Number(commentId),
    userId: Number(userId),
    like: Boolean(like),
    createdAt,
  })

  await tryQueue({
    label: "comment-like",
    redisAction: () => redis.hset(COMMENT_LIKE_HASH_KEY, field, payload),
    fallbackAction: () =>
      commentLikeDb.setCommentLike({
        commentId: Number(commentId),
        userId: Number(userId),
        like: Boolean(like),
      }),
  })
}

async function queueCommentCreate({ commentId, dealId, userId, text, parentId, createdAt }) {
  if (!commentId || !dealId || !userId) return
  const redis = createRedisClient()

  const field = `comment:${commentId}`
  const payload = JSON.stringify({
    commentId: Number(commentId),
    dealId: Number(dealId),
    userId: Number(userId),
    text: String(text || ""),
    parentId: parentId ? Number(parentId) : null,
    createdAt,
  })

  await tryQueue({
    label: "comment-create",
    redisAction: () => redis.hset(COMMENT_HASH_KEY, field, payload),
    fallbackAction: async () => {
      await prisma.$transaction(async (tx) => {
        await tx.comment.create({
          data: {
            id: Number(commentId),
            dealId: Number(dealId),
            userId: Number(userId),
            text: String(text || ""),
            parentId: parentId ? Number(parentId) : null,
            createdAt: createdAt ? new Date(createdAt) : new Date(),
          },
        })
        await tx.deal.update({
          where: { id: Number(dealId) },
          data: { commentCount: { increment: 1 } },
        })
      })
    },
  })
}

async function queueCommentDelete({ commentId, dealId, createdAt }) {
  if (!commentId || !dealId) return
  const redis = createRedisClient()

  const field = `commentDelete:${commentId}`
  const payload = JSON.stringify({
    commentId: Number(commentId),
    dealId: Number(dealId),
    createdAt,
  })

  await tryQueue({
    label: "comment-delete",
    redisAction: () => redis.hset(COMMENT_DELETE_HASH_KEY, field, payload),
    fallbackAction: async () => {
      await prisma.$transaction(async (tx) => {
        const result = await tx.comment.updateMany({
          where: { id: Number(commentId), deletedAt: null },
          data: { deletedAt: new Date() },
        })
        if (result.count > 0) {
          await tx.deal.update({
            where: { id: Number(dealId) },
            data: { commentCount: { decrement: 1 } },
          })
        }
      })
    },
  })
}

async function queueDealUpdate({ dealId, data, updatedAt }) {
  if (!dealId || !data || typeof data !== "object") return
  const redis = createRedisClient()

  const field = `dealUpdate:${dealId}`
  const payload = JSON.stringify({
    dealId: Number(dealId),
    data,
    updatedAt,
  })
  const patch = sanitizeDealUpdate(data)

  await tryQueue({
    label: "deal-update",
    redisAction: () => redis.hset(DEAL_UPDATE_HASH_KEY, field, payload),
    fallbackAction: async () => {
      if (!Object.keys(patch).length) return
      await prisma.deal.update({
        where: { id: Number(dealId) },
        data: { ...patch, updatedAt: updatedAt ? new Date(updatedAt) : new Date() },
      })
    },
  })
}

async function queueDealCreate({ dealId, data, images = [], createdAt }) {
  if (!dealId || !data || typeof data !== "object") return
  const redis = createRedisClient()

  const field = `dealCreate:${dealId}`
  const payload = JSON.stringify({
    dealId: Number(dealId),
    data,
    images: Array.isArray(images) ? images : [],
    createdAt,
  })

  await tryQueue({
    label: "deal-create",
    redisAction: () => redis.hset(DEAL_CREATE_HASH_KEY, field, payload),
    fallbackAction: async () => {
      const normalized = normalizeDealCreateData({ ...data, id: dealId })
      await prisma.deal.create({ data: normalized })
      await dealAnalyticsDb.ensureTotalsForDealIds([Number(dealId)])
      if (Array.isArray(images) && images.length) {
        const imagesData = images.map((img) => ({
          dealId: Number(dealId),
          imageUrl: String(img.imageUrl || ""),
          order: Number(img.order || 0),
        }))
        await prisma.dealImage.createMany({ data: imagesData })
      }
      await prisma.$executeRawUnsafe(
        'SELECT setval(pg_get_serial_sequence(\'"Deal"\', \'id\'), (SELECT MAX(id) FROM "Deal"))'
      )
    },
  })
}

async function queueDealAiReviewUpdate({ dealId, data, updatedAt }) {
  if (!dealId || !data || typeof data !== "object") return
  const redis = createRedisClient()

  const field = `dealAiReview:${dealId}`
  const payload = JSON.stringify({
    dealId: Number(dealId),
    data,
    updatedAt,
  })

  await tryQueue({
    label: "deal-ai-review",
    redisAction: () => redis.hset(DEAL_AI_REVIEW_HASH_KEY, field, payload),
    fallbackAction: () =>
      prisma.dealAiReview.upsert({
        where: { dealId: Number(dealId) },
        create: {
          dealId: Number(dealId),
          bestCategoryId: Number(data.bestCategoryId) || 0,
          tags: Array.isArray(data.tags) ? data.tags : [],
          needsReview: Boolean(data.needsReview),
          hasIssue: Boolean(data.hasIssue),
          issueType: String(data.issueType || "NONE"),
          issueReason: data.issueReason ?? null,
        },
        update: {
          bestCategoryId: Number(data.bestCategoryId) || 0,
          tags: Array.isArray(data.tags) ? data.tags : [],
          needsReview: Boolean(data.needsReview),
          hasIssue: Boolean(data.hasIssue),
          issueType: String(data.issueType || "NONE"),
          issueReason: data.issueReason ?? null,
        },
      }),
  })
}

async function queueNotificationCreate({ userId, message, type = "INFO", createdAt }) {
  if (!userId || !message) return
  const redis = createRedisClient()

  const field = `notification:${userId}:${Date.now()}`
  const payload = JSON.stringify({
    userId: Number(userId),
    message: String(message),
    type: String(type || "INFO"),
    createdAt,
  })

  await tryQueue({
    label: "notification-create",
    redisAction: () => redis.hset(NOTIFICATION_HASH_KEY, field, payload),
    fallbackAction: async () => {
      await prisma.$transaction(async (tx) => {
        await tx.notification.create({
          data: {
            userId: Number(userId),
            message: String(message),
            type: String(type || "INFO"),
            createdAt: createdAt ? new Date(createdAt) : new Date(),
          },
        })
        await tx.user.update({
          where: { id: Number(userId) },
          data: { notificationCount: { increment: 1 } },
        })
      })
    },
  })
}

async function queueNotificationReadAll({ userId, readAt }) {
  if (!userId) return
  const redis = createRedisClient()

  const field = `notificationRead:${userId}:${Date.now()}`
  const payload = JSON.stringify({
    userId: Number(userId),
    readAt,
  })

  await tryQueue({
    label: "notification-read",
    redisAction: () => redis.hset(NOTIFICATION_READ_HASH_KEY, field, payload),
    fallbackAction: async () => {
      const readAtDate = readAt ? new Date(readAt) : new Date()
      await prisma.notification.updateMany({
        where: {
          userId: Number(userId),
          readAt: null,
          createdAt: { lte: readAtDate },
        },
        data: { readAt: readAtDate },
      })
    },
  })
}

async function queueDealSaveUpdate({ dealId, userId, action, createdAt }) {
  if (!dealId || !userId) return
  const normalized = String(action || "").toUpperCase()
  if (!["SAVE", "UNSAVE"].includes(normalized)) return
  const redis = createRedisClient()

  const field = `dealSave:${dealId}:${userId}`
  const payload = JSON.stringify({
    dealId: Number(dealId),
    userId: Number(userId),
    action: normalized,
    createdAt,
  })

  await tryQueue({
    label: "deal-save",
    redisAction: () => redis.hset(DEAL_SAVE_HASH_KEY, field, payload),
    fallbackAction: async () => {
      if (normalized === "SAVE") {
        await dealSaveDb.upsertDealSave({
          dealId: Number(dealId),
          userId: Number(userId),
          createdAt: createdAt ? new Date(createdAt) : new Date(),
        })
        return
      }
      await dealSaveDb.deleteDealSave({ dealId: Number(dealId), userId: Number(userId) })
    },
  })
}

async function queueAuditEvent({ userId, action, ip, userAgent, meta = null, createdAt }) {
  if (!action) return
  const redis = createRedisClient()
  const field = `audit:${Date.now()}:${Math.random().toString(36).slice(2, 8)}`
  const payload = JSON.stringify({
    userId: userId ? Number(userId) : null,
    action: String(action),
    ip: ip ?? null,
    userAgent: userAgent ?? null,
    meta,
    createdAt,
  })

  await tryQueue({
    label: "audit",
    redisAction: () => redis.hset(AUDIT_HASH_KEY, field, payload),
    fallbackAction: () =>
      prisma.auditEvent.create({
        data: {
          userId: userId ? Number(userId) : null,
          action: String(action),
          ip: ip ?? null,
          userAgent: userAgent ?? null,
          meta,
          createdAt: createdAt ? new Date(createdAt) : new Date(),
        },
      }),
  })
}

async function queueUserUpdate({ userId, data, updatedAt }) {
  if (!userId || !data || typeof data !== "object") return
  const redis = createRedisClient()
  const field = `userUpdate:${userId}`
  const payload = JSON.stringify({
    userId: Number(userId),
    data,
    updatedAt,
  })

  await tryQueue({
    label: "user-update",
    redisAction: () => redis.hset(USER_UPDATE_HASH_KEY, field, payload),
    fallbackAction: () =>
      prisma.user.update({
        where: { id: Number(userId) },
        data: { ...data, updatedAt: updatedAt ? new Date(updatedAt) : new Date() },
      }),
  })
}

async function queueUserNoteCreate({ userId, createdById, note, createdAt }) {
  if (!userId || !createdById || !note) return
  const redis = createRedisClient()
  const field = `userNote:${userId}:${Date.now()}`
  const payload = JSON.stringify({
    userId: Number(userId),
    createdById: Number(createdById),
    note: String(note),
    createdAt,
  })

  await tryQueue({
    label: "user-note",
    redisAction: () => redis.hset(USER_NOTE_HASH_KEY, field, payload),
    fallbackAction: () =>
      prisma.userNote.create({
        data: {
          userId: Number(userId),
          createdById: Number(createdById),
          note: String(note),
          createdAt: createdAt ? new Date(createdAt) : new Date(),
        },
      }),
  })
}

async function queueDealReportStatusUpdate({ reportId, status, updatedAt }) {
  if (!reportId || !status) return
  const redis = createRedisClient()
  const field = `dealReport:${reportId}`
  const payload = JSON.stringify({
    reportId: Number(reportId),
    status: String(status),
    updatedAt,
  })

  await tryQueue({
    label: "deal-report",
    redisAction: () => redis.hset(DEAL_REPORT_UPDATE_HASH_KEY, field, payload),
    fallbackAction: () =>
      prisma.dealReport.update({
        where: { id: Number(reportId) },
        data: { status: String(status), updatedAt: updatedAt ? new Date(updatedAt) : new Date() },
      }),
  })
}

async function queueCategoryUpsert({ categoryId, data, updatedAt }) {
  if (!categoryId || !data || typeof data !== "object") return
  const redis = createRedisClient()
  const field = `category:${categoryId}`
  const payload = JSON.stringify({
    categoryId: Number(categoryId),
    data,
    updatedAt,
  })

  await tryQueue({
    label: "category-upsert",
    redisAction: () => redis.hset(CATEGORY_UPSERT_HASH_KEY, field, payload),
    fallbackAction: () =>
      prisma.category.upsert({
        where: { id: Number(categoryId) },
        create: { id: Number(categoryId), ...data },
        update: data,
      }),
  })
}

async function queueSellerUpsert({ sellerId, data, updatedAt }) {
  if (!sellerId || !data || typeof data !== "object") return
  const redis = createRedisClient()
  const field = `seller:${sellerId}`
  const payload = JSON.stringify({
    sellerId: Number(sellerId),
    data,
    updatedAt,
  })

  await tryQueue({
    label: "seller-upsert",
    redisAction: () => redis.hset(SELLER_UPSERT_HASH_KEY, field, payload),
    fallbackAction: () =>
      prisma.seller.upsert({
        where: { id: Number(sellerId) },
        create: { id: Number(sellerId), ...data },
        update: data,
      }),
  })
}

async function queueSellerDomainUpsert({ sellerId, domain, createdById }) {
  if (!sellerId || !domain || !createdById) return
  const redis = createRedisClient()
  const normalizedDomain = String(domain).toLowerCase()
  const field = `sellerDomain:${sellerId}:${normalizedDomain}`
  const payload = JSON.stringify({
    sellerId: Number(sellerId),
    domain: normalizedDomain,
    createdById: Number(createdById),
  })

  await tryQueue({
    label: "seller-domain-upsert",
    redisAction: () => redis.hset(SELLER_DOMAIN_UPSERT_HASH_KEY, field, payload),
    fallbackAction: () =>
      prisma.sellerDomain.upsert({
        where: { domain: normalizedDomain },
        create: {
          domain: normalizedDomain,
          sellerId: Number(sellerId),
          createdById: Number(createdById),
        },
        update: { sellerId: Number(sellerId) },
      }),
  })
}

module.exports = {
  queueVoteUpdate,
  queueCommentLikeUpdate,
  queueCommentCreate,
  queueCommentDelete,
  queueDealUpdate,
  queueDealCreate,
  queueDealAiReviewUpdate,
  queueNotificationCreate,
  queueNotificationReadAll,
  queueDealSaveUpdate,
  queueAuditEvent,
  queueUserUpdate,
  queueUserNoteCreate,
  queueDealReportStatusUpdate,
  queueCategoryUpsert,
  queueSellerUpsert,
  queueSellerDomainUpsert,
  COMMENT_HASH_KEY,
  COMMENT_DELETE_HASH_KEY,
  VOTE_HASH_KEY,
  COMMENT_LIKE_HASH_KEY,
  DEAL_UPDATE_HASH_KEY,
  DEAL_CREATE_HASH_KEY,
  DEAL_AI_REVIEW_HASH_KEY,
  NOTIFICATION_HASH_KEY,
  NOTIFICATION_READ_HASH_KEY,
  DEAL_SAVE_HASH_KEY,
  AUDIT_HASH_KEY,
  USER_UPDATE_HASH_KEY,
  USER_NOTE_HASH_KEY,
  DEAL_REPORT_UPDATE_HASH_KEY,
  CATEGORY_UPSERT_HASH_KEY,
  SELLER_UPSERT_HASH_KEY,
  SELLER_DOMAIN_UPSERT_HASH_KEY,
  DEAL_ANALYTICS_TOTAL_HASH_KEY,
}