import { useState } from 'react'
import {
  Ticket,
  Building2,
  UserCircle,
  Monitor,
  MessageSquare,
  Link2,
  ChevronDown,
  ChevronRight,
  RefreshCw,
  Loader2,
  AlertTriangle,
} from 'lucide-react'
import { cn } from '@/lib/utils'
import type { TicketContext } from '@/api/psaContext'

interface TicketContextPanelProps {
  context: TicketContext | null
  loading: boolean
  error: string | null
  onRefresh: () => void
}

interface AccordionSectionProps {
  label: string
  icon: React.ReactNode
  count?: number
  children: React.ReactNode
}

function AccordionSection({ label, icon, count, children }: AccordionSectionProps) {
  const [open, setOpen] = useState(false)

  return (
    <div className="border-t border-[rgba(255,255,255,0.06)]">
      <button
        onClick={() => setOpen(!open)}
        className="flex w-full items-center gap-2 px-3 py-2 text-left hover:bg-[rgba(255,255,255,0.03)] transition-colors"
      >
        <span className="text-muted-foreground">{icon}</span>
        <span className="flex-1 text-xs font-medium text-foreground">{label}</span>
        {count !== undefined && count > 0 && (
          <span className="rounded-full bg-accent-dim px-1.5 py-0.5 text-[0.6rem] font-sans text-xs text-primary">
            {count}
          </span>
        )}
        <span className="text-muted-foreground">
          {open ? <ChevronDown className="h-3.5 w-3.5" /> : <ChevronRight className="h-3.5 w-3.5" />}
        </span>
      </button>
      {open && (
        <div className="px-3 pb-3 pt-1">
          {children}
        </div>
      )}
    </div>
  )
}

export function TicketContextPanel({ context, loading, error, onRefresh }: TicketContextPanelProps) {
  return (
    <div className="card-flat overflow-hidden rounded-lg">
      {/* Header */}
      <div className="flex items-center gap-2 bg-[rgba(96,165,250,0.05)] px-3 py-2.5">
        <Ticket className="h-3.5 w-3.5 text-primary" />
        <span className="flex-1 font-sans text-xs text-[0.625rem] uppercase tracking-[0.1em] text-primary">
          Ticket Context
        </span>
        <button
          onClick={onRefresh}
          disabled={loading}
          title="Refresh ticket context"
          className="rounded p-0.5 text-muted-foreground hover:text-foreground disabled:cursor-not-allowed transition-colors"
        >
          <RefreshCw className={cn('h-3 w-3', loading && 'animate-spin')} />
        </button>
      </div>

      {/* Loading */}
      {loading && !context && (
        <div className="flex items-center justify-center py-6">
          <Loader2 className="h-5 w-5 animate-spin text-muted-foreground" />
        </div>
      )}

      {/* Error */}
      {error && !loading && (
        <div className="flex items-start gap-2 px-3 py-3">
          <AlertTriangle className="mt-0.5 h-3.5 w-3.5 shrink-0 text-rose-400" />
          <p className="text-xs text-rose-400">{error}</p>
        </div>
      )}

      {/* Context content */}
      {context && !loading && (
        <>
          {/* Compact summary */}
          <div className="px-3 py-2.5">
            <div className="flex items-baseline gap-2">
              <span className="font-sans text-xs text-xs font-medium text-primary">#{context.ticket.id}</span>
              <span className="flex-1 truncate text-xs text-foreground">{context.ticket.summary}</span>
            </div>
            <div className="mt-1.5 flex flex-wrap gap-1.5">
              <span className="rounded-md bg-card px-1.5 py-0.5 font-sans text-xs text-[0.6rem] text-muted-foreground border border-[rgba(255,255,255,0.06)]">
                {context.ticket.status}
              </span>
              <span className="rounded-md bg-card px-1.5 py-0.5 font-sans text-xs text-[0.6rem] text-muted-foreground border border-[rgba(255,255,255,0.06)]">
                {context.ticket.priority}
              </span>
              {context.ticket.sla && (
                <span className="rounded-md bg-amber-400/10 px-1.5 py-0.5 font-sans text-xs text-[0.6rem] text-amber-400 border border-amber-400/20">
                  SLA: {context.ticket.sla}
                </span>
              )}
            </div>
            <p className="mt-1 text-[0.6875rem] text-muted-foreground">{context.company.name}</p>
          </div>

          {/* Client */}
          <AccordionSection label="Client" icon={<Building2 className="h-3.5 w-3.5" />}>
            <div className="space-y-1 text-xs">
              <p className="font-medium text-foreground">{context.company.name}</p>
              {context.company.type && (
                <p className="text-muted-foreground">Type: {context.company.type}</p>
              )}
              {context.company.territory && (
                <p className="text-muted-foreground">Territory: {context.company.territory}</p>
              )}
              {context.company.site && (
                <p className="text-muted-foreground">Site: {context.company.site}</p>
              )}
              {context.company.address && (
                <p className="text-muted-foreground">{context.company.address}</p>
              )}
              {context.company.phone && (
                <p className="text-muted-foreground">{context.company.phone}</p>
              )}
            </div>
          </AccordionSection>

          {/* Contact */}
          {context.contact && (
            <AccordionSection label="Contact" icon={<UserCircle className="h-3.5 w-3.5" />}>
              <div className="space-y-1 text-xs">
                <p className="font-medium text-foreground">{context.contact.name}</p>
                {context.contact.title && (
                  <p className="text-muted-foreground">{context.contact.title}</p>
                )}
                {context.contact.email && (
                  <p className="text-muted-foreground">{context.contact.email}</p>
                )}
                {context.contact.phone && (
                  <p className="text-muted-foreground">{context.contact.phone}</p>
                )}
              </div>
            </AccordionSection>
          )}

          {/* Devices */}
          {context.configurations.length > 0 && (
            <AccordionSection
              label="Devices"
              icon={<Monitor className="h-3.5 w-3.5" />}
              count={context.configurations.length}
            >
              <div className="space-y-2">
                {context.configurations.map((cfg, i) => (
                  <div key={i} className="rounded-md border border-[rgba(255,255,255,0.06)] bg-card p-2">
                    <p className="text-xs font-medium text-foreground">{cfg.device_identifier}</p>
                    <div className="mt-0.5 space-y-0.5 text-[0.6875rem] text-muted-foreground">
                      {cfg.type && <p>Type: {cfg.type}</p>}
                      {cfg.os_type && <p>OS: {cfg.os_type}</p>}
                      {cfg.ip_address && <p>IP: {cfg.ip_address}</p>}
                      {cfg.serial_number && <p>S/N: {cfg.serial_number}</p>}
                      {cfg.model_number && <p>Model: {cfg.model_number}</p>}
                    </div>
                  </div>
                ))}
              </div>
            </AccordionSection>
          )}

          {/* Notes */}
          {context.notes.length > 0 && (
            <AccordionSection
              label="Notes"
              icon={<MessageSquare className="h-3.5 w-3.5" />}
              count={context.notes.length}
            >
              <div className="space-y-2">
                {context.notes.map((note, i) => (
                  <div key={i} className="rounded-md border border-[rgba(255,255,255,0.06)] bg-card p-2">
                    <div className="mb-1 flex items-center justify-between gap-2">
                      {note.member && (
                        <span className="text-[0.6rem] font-sans text-xs text-muted-foreground">{note.member}</span>
                      )}
                      <span className="ml-auto text-[0.6rem] font-sans text-xs text-muted-foreground">
                        {new Date(note.date_created).toLocaleDateString()}
                      </span>
                    </div>
                    <p className="whitespace-pre-wrap text-[0.6875rem] text-foreground line-clamp-4">
                      {note.text}
                    </p>
                  </div>
                ))}
              </div>
            </AccordionSection>
          )}

          {/* Related Tickets */}
          {context.related_tickets.length > 0 && (
            <AccordionSection
              label="Related"
              icon={<Link2 className="h-3.5 w-3.5" />}
              count={context.related_tickets.length}
            >
              <div className="space-y-1.5">
                {context.related_tickets.map((rt) => (
                  <div
                    key={rt.id}
                    className="rounded-md border border-[rgba(255,255,255,0.06)] bg-card px-2 py-1.5"
                  >
                    <div className="flex items-baseline gap-1.5">
                      <span className="font-sans text-xs text-[0.6rem] text-primary">#{rt.id}</span>
                      <span className="flex-1 truncate text-[0.6875rem] text-foreground">{rt.summary}</span>
                    </div>
                    <div className="mt-0.5 flex gap-1">
                      <span className="text-[0.6rem] text-muted-foreground">{rt.status}</span>
                      <span className="text-[0.6rem] text-muted-foreground">·</span>
                      <span className="text-[0.6rem] text-muted-foreground">{rt.priority}</span>
                    </div>
                  </div>
                ))}
              </div>
            </AccordionSection>
          )}
        </>
      )}
    </div>
  )
}