"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 } from "react"
import { Button } from "@/components/ui/button"
import { Card, CardTitle, CardHeader, CardContent } from "@/components/ui/card"
import { Input } from "@/components/ui/input"
import { Badge } from "@/components/ui/badge"

export default function ExecutionReportDetailsPage({ params }: { params: { id: string } }) {
  const { id } = params;
  const router = useRouter()
  const [report, setReport] = useState<any | null>(null)
  const [loading, setLoading] = useState(true)

  useEffect(() => {
    fetch("/execution-operations/api")
      .then(res => res.json())
      .then((data) => {
        const found = data.invoices.find((r: any) => r.id === Number(id))
        if (found) setReport(found)
        setLoading(false)
      })
  }, [id])

  const handleBack = () => {
    if (window.history.length > 1) {
      router.back();
    } else {
      router.push("/execution-operations/executionreport");
    }
  }

  const handleSave = async () => {
    if (!report) return;
    try {
      const response = await fetch('/execution-operations/api', {
        method: 'PUT',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(report)
      });
      if (!response.ok) throw new Error('Failed to save changes');
      alert('Report saved!');
      router.refresh();
    } catch (error) {
      alert('Failed to save changes.');
    }
  };

  if (loading) return <div>Loading...</div>
  if (!report) return <div>Report not found</div>

  // 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()
  }

  return (
    <SidebarProvider style={{"--sidebar-width": "calc(var(--spacing) * 72)","--header-height": "calc(var(--spacing) * 12)"} as React.CSSProperties}>
      <AppSidebar variant="inset" />
      <SidebarInset>
        <SiteHeader title="Execution Report Details" />
        <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">
              <div className="flex items-center gap-4">
                <h2 className="text-2xl font-bold">Execution Report Details</h2>
                <Badge variant={openAmount === "0" ? "default" : "destructive"}>
                  {openAmount === "0" ? "Paid" : "Unpaid"}
                </Badge>
              </div>
              <div className="flex gap-2">
                <Button variant="outline" onClick={handleBack}>Back</Button>
                <Button onClick={handleSave}>Save Changes</Button>
              </div>
            </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="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 "]?.replace(/,/g, "") || ""} 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>
        </div>
      </SidebarInset>
    </SidebarProvider>
  )
}