"use client";

import { useState, useEffect } from "react";
import { Card } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";
import { ProgressCard } from "@/components/shared/ProgressCard";
import { ResultsTable, type ResultRow } from "@/components/shared/ResultsTable";
import { ExportButtons } from "@/components/shared/ExportButtons";
import { EmptyState } from "@/components/shared/EmptyState";
import { toast } from "sonner";
import {
  Linkedin, ChevronRight, AlertTriangle, CheckCircle2, XCircle,
  ChevronDown, ChevronUp, Info
} from "lucide-react";
import { useAppStore } from "@/lib/store";
import type { DecisionMakerCategory } from "@/lib/services/anymailfinder";
import type { ExportRow } from "@/lib/utils/csv";

const CATEGORY_OPTIONS: { value: DecisionMakerCategory; label: string; recommended?: boolean }[] = [
  { value: "ceo", label: "CEO / Owner / President / Founder", recommended: true },
  { value: "operations", label: "COO" },
  { value: "engineering", label: "CTO" },
  { value: "marketing", label: "CMO" },
  { value: "finance", label: "CFO" },
  { value: "sales", label: "Vertriebsleiter" },
];

type Stage = "idle" | "scraping" | "scraped" | "enriching" | "done" | "failed";

export default function LinkedInPage() {
  const [salesNavUrl, setSalesNavUrl] = useState("");
  const [maxResults, setMaxResults] = useState(100);
  const [vayneConfigured, setVayneConfigured] = useState<boolean | null>(null);
  const [guideOpen, setGuideOpen] = useState(false);
  const [stage, setStage] = useState<Stage>("idle");
  const [scrapeJobId, setScrapeJobId] = useState<string | null>(null);
  const [enrichJobId, setEnrichJobId] = useState<string | null>(null);
  const [scrapeProgress, setScrapeProgress] = useState({ current: 0, total: 0 });
  const [enrichProgress, setEnrichProgress] = useState({ current: 0, total: 0 });
  const [results, setResults] = useState<ResultRow[]>([]);
  const [selectedIds, setSelectedIds] = useState<string[]>([]);
  const [category, setCategory] = useState<DecisionMakerCategory>("ceo");
  const { addJob, updateJob, removeJob } = useAppStore();

  useEffect(() => {
    fetch("/api/credentials")
      .then(r => r.json())
      .then((d: Record<string, boolean>) => setVayneConfigured(d.vayne))
      .catch(() => setVayneConfigured(false));
  }, []);

  const urlValid = salesNavUrl.includes("linkedin.com/sales");

  const startScrape = async () => {
    if (!urlValid) return toast.error("Bitte gültige Sales Navigator URL einfügen");
    if (!vayneConfigured) return toast.error("Bitte zuerst Vayne API-Token in den Einstellungen konfigurieren");

    setStage("scraping");
    setScrapeProgress({ current: 0, total: maxResults });
    setResults([]);

    try {
      const res = await fetch("/api/jobs/vayne-scrape", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ salesNavUrl, maxResults }),
      });
      const data = await res.json() as { jobId?: string; error?: string };
      if (!res.ok || !data.jobId) throw new Error(data.error || "Failed");

      setScrapeJobId(data.jobId);
      addJob({ id: data.jobId, type: "linkedin-scrape", status: "running", progress: 0, total: maxResults });
      pollScrape(data.jobId);
    } catch (err) {
      toast.error(err instanceof Error ? err.message : "Scraping konnte nicht gestartet werden");
      setStage("failed");
    }
  };

  const pollScrape = (id: string) => {
    const interval = setInterval(async () => {
      try {
        const res = await fetch(`/api/jobs/${id}/status`);
        const data = await res.json() as {
          status: string; totalLeads: number; results: ResultRow[];
        };

        setScrapeProgress({ current: data.totalLeads, total: maxResults });
        if (data.results?.length) setResults(data.results);

        updateJob(id, { status: data.status, progress: data.totalLeads });

        if (data.status === "complete" || data.status === "failed") {
          clearInterval(interval);
          removeJob(id);
          if (data.status === "complete") {
            setStage("scraped");
            setResults(data.results || []);
            setSelectedIds(data.results?.map(r => r.id) || []);
            toast.success(`${data.totalLeads} Profile von LinkedIn gescrapt`);
          } else {
            setStage("failed");
            toast.error("Scraping fehlgeschlagen. Bitte Vayne-Token in den Einstellungen prüfen.");
          }
        }
      } catch {
        clearInterval(interval);
        setStage("failed");
      }
    }, 2000);
  };

  const startEnrich = async () => {
    if (!selectedIds.length) return toast.error("Mindestens ein Profil zum Anreichern auswählen");

    setStage("enriching");
    setEnrichProgress({ current: 0, total: selectedIds.length });

    try {
      const res = await fetch("/api/jobs/linkedin-enrich", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ jobId: scrapeJobId, resultIds: selectedIds, categories: [category] }),
      });
      const data = await res.json() as { jobId?: string; error?: string };
      if (!res.ok || !data.jobId) throw new Error(data.error || "Failed");

      setEnrichJobId(data.jobId);
      addJob({ id: data.jobId, type: "linkedin-enrich", status: "running", progress: 0, total: selectedIds.length });
      pollEnrich(data.jobId);
    } catch (err) {
      toast.error(err instanceof Error ? err.message : "Anreicherung konnte nicht gestartet werden");
      setStage("scraped");
    }
  };

  const pollEnrich = (id: string) => {
    const interval = setInterval(async () => {
      try {
        const res = await fetch(`/api/jobs/${id}/status`);
        const data = await res.json() as {
          status: string; totalLeads: number; emailsFound: number;
        };

        setEnrichProgress({ current: data.emailsFound, total: data.totalLeads });
        updateJob(id, { status: data.status, progress: data.emailsFound });

        if (data.status === "complete" || data.status === "failed") {
          clearInterval(interval);
          removeJob(id);
          // Refresh results from scrape job
          const jobRes = await fetch(`/api/jobs/${scrapeJobId}/status`);
          const jobData = await jobRes.json() as { results: ResultRow[] };
          setResults(jobData.results || []);

          if (data.status === "complete") {
            setStage("done");
            toast.success(`${data.emailsFound} E-Mails gefunden`);
          } else {
            setStage("scraped");
            toast.error("Anreicherung fehlgeschlagen");
          }
        }
      } catch {
        clearInterval(interval);
      }
    }, 2000);
  };

  const exportRows: ExportRow[] = results.map(r => ({
    company_name: r.companyName,
    domain: r.domain,
    contact_name: r.contactName,
    contact_title: r.contactTitle,
    email: r.email,
    confidence_score: r.confidence !== undefined ? Math.round(r.confidence * 100) : undefined,
    source_tab: "linkedin",
    job_id: scrapeJobId || "",
    found_at: new Date().toISOString(),
  }));

  const emailsFound = results.filter(r => r.email).length;

  return (
    <div className="space-y-6 max-w-5xl">
      {/* Header */}
      <div className="relative rounded-2xl bg-gradient-to-r from-blue-700/10 to-blue-500/10 border border-[#1e1e2e] p-6 overflow-hidden">
        <div className="absolute inset-0 bg-gradient-to-br from-blue-600/5 to-transparent" />
        <div className="relative">
          <div className="flex items-center gap-2 text-sm text-blue-400 mb-2">
            <Linkedin className="w-4 h-4" />
            <span>Tab 2</span>
            <ChevronRight className="w-3 h-3" />
            <span>LinkedIn Sales Navigator</span>
          </div>
          <h1 className="text-2xl font-bold text-white">LinkedIn → E-Mail Pipeline</h1>
          <p className="text-gray-400 mt-1 text-sm">
            Scrape Sales Navigator-Profile über Vayne und reichere sie mit Anymailfinder an.
          </p>
        </div>
      </div>

      {/* Filter Guide */}
      <Card className="bg-[#111118] border-purple-500/20 p-0 overflow-hidden">
        <button
          onClick={() => setGuideOpen(g => !g)}
          className="w-full flex items-center justify-between px-6 py-4 hover:bg-purple-500/5 transition-colors"
        >
          <div className="flex items-center gap-2 text-purple-300 font-medium">
            <Info className="w-4 h-4" />
            Empfohlene Sales Navigator Filtereinstellungen
          </div>
          {guideOpen ? <ChevronUp className="w-4 h-4 text-gray-500" /> : <ChevronDown className="w-4 h-4 text-gray-500" />}
        </button>
        {guideOpen && (
          <div className="px-6 pb-5 border-t border-purple-500/10 space-y-4 text-sm">
            <div className="grid grid-cols-2 gap-4 pt-4">
              <div>
                <p className="text-gray-400 font-medium mb-2">Zielpositionen</p>
                <div className="flex flex-wrap gap-1.5">
                  {["Founder", "Co-Founder", "CEO", "CTO", "COO", "CMO", "Owner", "Owner Operator", "President", "Principal", "Partner", "CXO", "Geschäftsführer", "Inhaber"].map(k => (
                    <span key={k} className="bg-purple-500/10 text-purple-300 px-2 py-0.5 rounded text-xs">{k}</span>
                  ))}
                </div>
              </div>
              <div>
                <p className="text-gray-400 font-medium mb-2">Mitarbeiterzahl</p>
                <div className="flex flex-wrap gap-1.5">
                  {["1–10", "11–50", "51–200"].map(k => (
                    <span key={k} className="bg-blue-500/10 text-blue-300 px-2 py-0.5 rounded text-xs">{k}</span>
                  ))}
                </div>
              </div>
              <div>
                <p className="text-gray-400 font-medium mb-2">Land</p>
                <span className="bg-green-500/10 text-green-300 px-2 py-0.5 rounded text-xs">Deutschland</span>
              </div>
              <div>
                <p className="text-gray-400 font-medium mb-2">Schlüsselwörter (optional)</p>
                <div className="flex flex-wrap gap-1.5">
                  {["Solaranlage", "Photovoltaik", "Solar", "Handwerker", "Installateur"].map(k => (
                    <span key={k} className="bg-green-500/10 text-green-300 px-2 py-0.5 rounded text-xs">{k}</span>
                  ))}
                </div>
              </div>
            </div>
          </div>
        )}
      </Card>

      {/* Step 1: Input */}
      <Card className="bg-[#111118] border-[#1e1e2e] p-6 space-y-5">
        <h2 className="text-base font-semibold text-white flex items-center gap-2">
          <span className="w-6 h-6 rounded-full bg-blue-500/20 text-blue-400 text-xs flex items-center justify-center font-bold">1</span>
          Sales Navigator URL
        </h2>

        {/* Vayne status */}
        <div className={`flex items-center gap-2 px-3 py-2.5 rounded-lg border text-sm ${
          vayneConfigured === null ? "bg-[#0d0d18] border-[#1e1e2e] text-gray-400"
          : vayneConfigured ? "bg-green-500/5 border-green-500/20 text-green-400"
          : "bg-red-500/5 border-red-500/20 text-red-400"
        }`}>
          {vayneConfigured === null ? "Vayne-Konfiguration wird geprüft..."
          : vayneConfigured ? (
            <><CheckCircle2 className="w-4 h-4" /> Vayne API-Token konfiguriert</>
          ) : (
            <><XCircle className="w-4 h-4" /> Vayne-Token nicht konfiguriert — <a href="/settings" className="underline">zu den Einstellungen</a></>
          )}
        </div>

        <div>
          <Label className="text-gray-300 text-sm mb-1.5 block">Sales Navigator Such-URL</Label>
          <Textarea
            placeholder="https://www.linkedin.com/sales/search/people?query=..."
            value={salesNavUrl}
            onChange={e => setSalesNavUrl(e.target.value)}
            className="bg-[#0d0d18] border-[#2e2e3e] text-white placeholder:text-gray-600 focus:border-blue-500 resize-none h-20 font-mono text-xs"
          />
          {salesNavUrl && !urlValid && (
            <p className="text-xs text-red-400 mt-1">Muss eine linkedin.com/sales/search URL sein</p>
          )}
        </div>

        <div>
          <Label className="text-gray-300 text-sm mb-1.5 block">Maximale Ergebnisse</Label>
          <Input
            type="number"
            min={1}
            max={2500}
            value={maxResults}
            onChange={e => setMaxResults(Number(e.target.value))}
            className="bg-[#0d0d18] border-[#2e2e3e] text-white w-32"
          />
        </div>

        {/* Warning */}
        <div className="flex items-start gap-2 bg-yellow-500/5 border border-yellow-500/20 rounded-lg px-4 py-3">
          <AlertTriangle className="w-4 h-4 text-yellow-400 flex-shrink-0 mt-0.5" />
          <p className="text-xs text-yellow-300">
            Diesen Tab nicht schließen, solange das Scraping läuft. Der Job läuft im Hintergrund,
            aber die Fortschrittsanzeige benötigt diesen Tab.
          </p>
        </div>

        <Button
          onClick={startScrape}
          disabled={!urlValid || !vayneConfigured || stage === "scraping"}
          className="bg-gradient-to-r from-blue-500 to-purple-600 hover:from-blue-600 hover:to-purple-700 text-white font-medium px-8 shadow-lg hover:shadow-blue-500/25 transition-all disabled:opacity-50"
        >
          LinkedIn-Scraping starten
        </Button>
      </Card>

      {/* Scrape progress */}
      {(stage === "scraping") && (
        <ProgressCard
          title="LinkedIn-Profile werden über Vayne gescrapt..."
          current={scrapeProgress.current}
          total={scrapeProgress.total}
          subtitle="Auftrag erstellen → Scraping → Export generieren..."
          status="running"
        />
      )}

      {/* Results table */}
      {results.length > 0 && (
        <Card className="bg-[#111118] border-[#1e1e2e] p-6 space-y-4">
          <h2 className="text-base font-semibold text-white flex items-center gap-2">
            <span className="w-6 h-6 rounded-full bg-blue-500/20 text-blue-400 text-xs flex items-center justify-center font-bold">2</span>
            Gescrapte Profile ({results.length})
          </h2>
          <p className="text-xs text-gray-500">Profile für die E-Mail-Anreicherung auswählen</p>
          <ResultsTable
            rows={results}
            selectable
            onSelectionChange={setSelectedIds}
          />
        </Card>
      )}

      {/* Step 3: Enrich */}
      {(stage === "scraped" || stage === "enriching" || stage === "done") && results.length > 0 && (
        <Card className="bg-[#111118] border-[#1e1e2e] p-6 space-y-5">
          <h2 className="text-base font-semibold text-white flex items-center gap-2">
            <span className="w-6 h-6 rounded-full bg-blue-500/20 text-blue-400 text-xs flex items-center justify-center font-bold">3</span>
            Mit E-Mails anreichern
          </h2>

          <div className="flex flex-wrap gap-2">
            {CATEGORY_OPTIONS.map(opt => (
              <button
                key={opt.value}
                onClick={() => setCategory(opt.value)}
                className={`flex items-center gap-2 px-3 py-1.5 rounded-lg text-sm font-medium border transition-all ${
                  category === opt.value
                    ? "bg-blue-500/20 text-blue-300 border-blue-500/40"
                    : "bg-[#0d0d18] text-gray-400 border-[#2e2e3e] hover:border-blue-500/30"
                }`}
              >
                {opt.label}
                {opt.recommended && (
                  <span className="text-[10px] bg-blue-500/30 text-blue-300 px-1.5 py-0.5 rounded font-semibold">Empfohlen</span>
                )}
              </button>
            ))}
          </div>

          {stage === "enriching" && (
            <ProgressCard
              title="Profile werden angereichert..."
              current={enrichProgress.current}
              total={enrichProgress.total}
              subtitle="E-Mails werden über Anymailfinder gesucht"
              status="running"
            />
          )}

          {stage === "scraped" && (
            <Button
              onClick={startEnrich}
              disabled={!selectedIds.length}
              className="bg-gradient-to-r from-blue-500 to-purple-600 hover:from-blue-600 hover:to-purple-700 text-white font-medium px-8 shadow-lg hover:shadow-blue-500/25 transition-all"
            >
              {selectedIds.length} ausgewählte Profile mit E-Mails anreichern
            </Button>
          )}
        </Card>
      )}

      {/* Export */}
      {(stage === "done" || emailsFound > 0) && (
        <Card className="bg-[#111118] border-[#1e1e2e] p-6">
          <ExportButtons
            rows={exportRows}
            filename={`linkedin-leads-${scrapeJobId?.slice(0, 8) || "export"}`}
            summary={`${emailsFound} E-Mails aus ${results.length} Profilen gefunden`}
          />
        </Card>
      )}

      {/* Empty state */}
      {stage === "idle" && (
        <EmptyState
          icon={Linkedin}
          title="Sales Navigator URL einfügen"
          description="Suchfilter in Sales Navigator konfigurieren, URL kopieren und oben einfügen."
        />
      )}
    </div>
  );
}