"use client"

import { AppSidebar } from "@/components/app-sidebar"
import { SiteHeader } from "@/components/site-header"
import { SidebarInset, SidebarProvider } from "@/components/ui/sidebar"
import { useRouter } from "next/navigation"
import { useState, useEffect, useMemo } from "react"
import { Button } from "@/components/ui/button"
import { Card, CardTitle, CardHeader, CardContent } from "@/components/ui/card"
import { Input } from "@/components/ui/input"
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select"

export default function NewExecutionReportPage() {
  const router = useRouter()
  const [invoices, setInvoices] = useState<any[]>([])
  const [selectedInvoice, setSelectedInvoice] = useState<any | null>(null)
  const [report, setReport] = useState<any>({})
  const [loading, setLoading] = useState(true)
  const [saving, setSaving] = useState(false)

  useEffect(() => {
    fetch("/execution-operations/api")
      .then(res => res.json())
      .then(data => {
        setInvoices(data.invoices)
        setLoading(false)
      })
  }, [])

  const invoiceNumbers = useMemo(() => [...new Set(invoices.map(i => i["Invoice no"]))], [invoices])

  const handleInvoiceSelect = (val: string) => {
    const invoice = invoices.find(i => i["Invoice no"] === val)
    setSelectedInvoice(invoice)
    if (invoice) {
      setReport({
        ...report,
        ...invoice,
        "Cashed in date": invoice["Cashed in date"] || "",
        " Cashed in value ": invoice[" Cashed in value "] || "",
        "Mentions": invoice["Mentions"] || ""
      })
    }
  }

  // Calculate open amount and delay days
  const cashedInValue = parseFloat(report[" Cashed in value "]?.replace(/,/g, "") || "0")
  const totalValue = parseFloat(report[" Invoice Total Value "]?.replace(/,/g, "") || "0")
  const openAmount = (totalValue - cashedInValue).toLocaleString(undefined, { maximumFractionDigits: 2 })

  let delayDays = "-"
  if (report["Invoice due date"] && report["Cashed in date"]) {
    const due = new Date(report["Invoice due date"])
    const cashed = new Date(report["Cashed in date"])
    delayDays = Math.max(0, Math.ceil((cashed.getTime() - due.getTime()) / (1000 * 60 * 60 * 24))).toString()
  }

  const handleSave = async () => {
    setSaving(true)
    // Simulate POST
    setTimeout(() => {
      alert("Execution report created! (Simulated)")
      setSaving(false)
      router.push("/execution-operations/executionreport")
    }, 1000)
  }

  if (loading) return <div>Loading...</div>

  return (
    <SidebarProvider style={{"--sidebar-width": "calc(var(--spacing) * 72)","--header-height": "calc(var(--spacing) * 12)"} as React.CSSProperties}>
      <AppSidebar variant="inset" />
      <SidebarInset>
        <SiteHeader title="New Execution Report" />
        <div className="flex flex-1 flex-col">
          <div className="flex flex-col gap-4 py-4 md:gap-6 md:py-4">
            <div className="flex justify-between items-center px-4 lg:px-6">
              <h2 className="text-2xl font-bold">New Execution Report</h2>
            </div>
            <div className="grid grid-cols-1 lg:grid-cols-2 gap-4 px-4 lg:px-6">
              <Card>
                <CardHeader>
                  <CardTitle>Report Information</CardTitle>
                </CardHeader>
                <CardContent className="space-y-4">
                  <div className="mb-4">
                    <Select value={selectedInvoice?.["Invoice no"] || ""} onValueChange={handleInvoiceSelect}>
                      <SelectTrigger><SelectValue placeholder="Select invoice number" /></SelectTrigger>
                      <SelectContent>
                        {invoiceNumbers.map(num => (
                          <SelectItem key={num} value={num}>{num}</SelectItem>
                        ))}
                      </SelectContent>
                    </Select>
                  </div>
                  <div className="grid grid-cols-2 gap-4">
                    <div className="flex flex-col gap-2">
                      <span className="font-medium">Cashed in Date</span>
                      <Input type="date" value={report["Cashed in date"] || ""} onChange={e => setReport({ ...report, "Cashed in date": e.target.value })} />
                    </div>
                    <div className="flex flex-col gap-2">
                      <span className="font-medium">Cashed in Value</span>
                      <Input type="number" value={report[" Cashed in value "] || ""} onChange={e => setReport({ ...report, " Cashed in value ": e.target.value })} />
                    </div>
                    <div className="flex flex-col gap-2">
                      <span className="font-medium">Mentions</span>
                      <Input value={report["Mentions"] || ""} onChange={e => setReport({ ...report, "Mentions": e.target.value })} placeholder="Enter mentions..." />
                    </div>
                  </div>
                </CardContent>
              </Card>
              <Card>
                <CardHeader>
                  <CardTitle>Auto-calculated</CardTitle>
                </CardHeader>
                <CardContent className="space-y-4">
                  <div className="flex flex-col gap-2">
                    <span className="font-medium">Open Amount</span>
                    <Input value={openAmount} readOnly />
                  </div>
                  <div className="flex flex-col gap-2">
                    <span className="font-medium">Delay Days</span>
                    <Input value={delayDays} readOnly />
                  </div>
                </CardContent>
              </Card>
            </div>
            <div className="flex justify-end px-4 lg:px-6">
              <Button onClick={handleSave} disabled={saving}>{saving ? "Saving..." : "Save Execution Report"}</Button>
            </div>
          </div>
        </div>
      </SidebarInset>
    </SidebarProvider>
  )
}