import { NextResponse } from "next/server"
import { fetchMutation } from "convex/nextjs"
import { api } from "@/convex/_generated/api"
import { requireGhlSyncAuth } from "@/app/api/internal/ghl/shared"
import { fetchGhlMessages } from "@/lib/server/ghl-sync"

export async function POST(request: Request) {
  const authError = await requireGhlSyncAuth(request)
  if (authError) {
    return authError
  }

  try {
    const body = await request.json().catch(() => ({}))
    const providedItems = Array.isArray(body.items) ? body.items : null
    const fetched = providedItems
      ? {
          items: providedItems,
          nextCursor:
            typeof body.nextCursor === "string" ? body.nextCursor : undefined,
        }
      : await fetchGhlMessages({
          limit: typeof body.limit === "number" ? body.limit : undefined,
          cursor: body.cursor ? String(body.cursor) : undefined,
          channel: body.channel === "Call" ? "Call" : "SMS",
        })

    const grouped = new Map<string, any>()
    for (const item of fetched.items) {
      const conversationId = String(item.conversationId || item.id || "")
      if (!conversationId || grouped.has(conversationId)) {
        continue
      }
      grouped.set(conversationId, item)
    }

    let imported = 0
    for (const [entityId, item] of grouped.entries()) {
      await fetchMutation(api.crm.importConversation, {
        provider: "ghl",
        entityId,
        payload: item,
      })
      imported += 1
    }

    await fetchMutation(api.crm.updateSyncCheckpoint, {
      provider: "ghl",
      entityType: "conversations",
      entityId: "conversations",
      cursor: fetched.nextCursor,
      status: "synced",
      metadata: JSON.stringify({
        imported,
      }),
    })

    return NextResponse.json({
      success: true,
      imported,
      nextCursor: fetched.nextCursor,
    })
  } catch (error) {
    console.error("Failed to sync GHL conversations:", error)
    return NextResponse.json(
      { error: "Failed to sync GHL conversations" },
      { status: 500 }
    )
  }
}