import { redirect } from "next/navigation"
import { and, desc, eq } from "drizzle-orm"
import { db } from "@/lib/db"
import { ai_recommendations, activity_log } from "@/lib/db/schema"
import { getSessionUser } from "@/lib/session"
import { ImpactClient } from "./impact-client"

export const metadata = { title: "AI Impact" }

export default async function ImpactPage() {
  const user = await getSessionUser()
  if (!user) redirect("/login")

  const [recs, activityRows] = await Promise.all([
    db
      .select()
      .from(ai_recommendations)
      .where(eq(ai_recommendations.user_id, user.id)),
    db
      .select()
      .from(activity_log)
      .where(and(eq(activity_log.user_id, user.id), eq(activity_log.type, "ai_action")))
      .orderBy(desc(activity_log.created_at))
      .limit(20),
  ])

  const all = recs ?? []
  const approved = all.filter((r) => r.status === "approved")
  const dismissed = all.filter((r) => r.status === "dismissed")

  let totalRevenue = 0
  let totalSavings = 0
  let totalRiskPrevented = 0

  for (const r of approved) {
    const val = Number(r.action_data?.estimated_value ?? 0)
    const vtype = r.action_data?.value_type ?? "revenue"
    if (vtype === "revenue") totalRevenue += val
    else if (vtype === "savings") totalSavings += val
    else if (vtype === "risk_prevention") totalRiskPrevented += val
  }

  const stats = {
    totals: {
      generated: all.length,
      approved: approved.length,
      dismissed: dismissed.length,
      pending: all.filter((r) => r.status === "pending").length,
      approval_rate: all.length > 0 ? Math.round((approved.length / all.length) * 100) : 0,
    },
    impact: {
      revenue: totalRevenue,
      savings: totalSavings,
      risk_prevented: totalRiskPrevented,
      total: totalRevenue + totalSavings + totalRiskPrevented,
    },
    recent_approved: approved
      .sort((a, b) => new Date(b.applied_at ?? 0).getTime() - new Date(a.applied_at ?? 0).getTime())
      .slice(0, 5),
  }

  return <ImpactClient stats={stats} activityLog={activityRows ?? []} />
}