// ── AI Assistant: Job Selector Component ──
// Dropdown that fetches and displays job categories from the API.
// Allows the user to pick a job, then triggers a Facebook search.

"use client"

import { useState, useEffect } from "react"
import { Briefcase, ChevronDown, Loader2, Search } from "lucide-react"

/** A job category returned from the API */
interface Job {
  job_title: string
  keywords: string[]
  industry: string
  description: string
}

interface JobSelectorProps {
  /** Called when a job is selected or cleared (null) */
  onSelect: (job: Job | null) => void
  /** Called when the user clicks the "Search Facebook" button */
  onSearch?: (job: Job) => void
  /** Whether a search is currently in progress */
  searching?: boolean
}

/**
 * JobSelector — dropdown to pick a job category and initiate a Facebook search.
 * Fetches available jobs on mount and provides a "Search Facebook" CTA once a job is selected.
 */
export function JobSelector({ onSelect, onSearch, searching }: JobSelectorProps) {
  const [jobs, setJobs] = useState<Job[]>([])
  const [loading, setLoading] = useState(true)
  const [open, setOpen] = useState(false)
  const [selected, setSelected] = useState<Job | null>(null)

  // ── Fetch available job categories on mount ──
  useEffect(() => {
    fetch("/api/ai/jobs")
      .then((r) => r.json())
      .then((data) => setJobs(data.jobs || []))
      .catch(() => setJobs([]))
      .finally(() => setLoading(false))
  }, [])

  // ── Select a job, close dropdown, notify parent ──
  const handleSelect = (job: Job) => {
    setSelected(job)
    setOpen(false)
    onSelect(job)
  }

  return (
    <div className="relative">
      {/* ── Dropdown trigger button ── */}
      <button
        type="button"
        onClick={() => setOpen(!open)}
        className="w-full flex items-center gap-2.5 bg-card/50 border border-border hover:border-primary/20 rounded-xl px-4 py-3 text-sm text-muted-foreground hover:text-foreground transition-all duration-200"
      >
        <Briefcase className="h-4 w-4 text-[#f97316] flex-none" />
        <span className="flex-1 text-left truncate">
          {selected ? selected.job_title : loading ? "Loading jobs..." : "Select a job category"}
        </span>
        {loading ? <Loader2 className="h-3.5 w-3.5 animate-spin text-primary" /> : <ChevronDown className={`h-3.5 w-3.5 text-muted-foreground/60 transition-transform duration-200 ${open ? "rotate-180" : ""}`} />}
      </button>

      {/* ── Dropdown menu — visible when open ── */}
      {open && (
        <>
          {/* Backdrop to close on click outside */}
          <div className="fixed inset-0 z-10" onClick={() => setOpen(false)} />
          <div className="absolute top-full left-0 right-0 mt-1.5 z-20 bg-card border border-border rounded-xl shadow-xl max-h-60 overflow-y-auto">
            {jobs.map((job, i) => (
              <button
                key={i}
                type="button"
                onClick={() => handleSelect(job)}
                className="w-full text-left px-4 py-3 text-sm text-muted-foreground hover:bg-muted hover:text-foreground transition-all duration-150 border-b border-border/20 last:border-b-0 border-l-2 border-l-transparent hover:border-l-primary/40"
              >
                <div className="font-medium">{job.job_title}</div>
                <div className="text-xs text-muted-foreground/60 mt-0.5">{job.industry} — {job.description}</div>
              </button>
            ))}
            {jobs.length === 0 && !loading && (
              <div className="px-4 py-4 text-xs text-muted-foreground/60 text-center">No job categories loaded</div>
            )}
          </div>
        </>
      )}
      {/* ── "Search Facebook" CTA — shown only when a job is selected ── */}
      {selected && onSearch && (
        <button
          type="button"
          onClick={() => onSearch(selected)}
          disabled={searching}
          className="w-full flex items-center justify-center gap-2 mt-3 bg-primary hover:bg-primary/90 disabled:opacity-50 disabled:cursor-not-allowed text-primary-foreground text-sm font-semibold rounded-xl px-4 py-3 transition-all duration-200 shadow-lg shadow-primary/20"
        >
          {searching ? <Loader2 className="h-4 w-4 animate-spin" /> : <Search className="h-4 w-4" />}
          {searching ? "Searching..." : "Search Facebook"}
        </button>
      )}
    </div>
  )
}