"use client";

import { useState } 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 { Checkbox } from "@/components/ui/checkbox";
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 { MapPin, ChevronRight, Plus, X, Info } from "lucide-react";
import { useAppStore } from "@/lib/store";
import type { DecisionMakerCategory } from "@/lib/services/anymailfinder";
import type { ExportRow } from "@/lib/utils/csv";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";

const CATEGORY_OPTIONS: { value: DecisionMakerCategory; label: string }[] = [
  { value: "ceo", label: "CEO / Owner / Founder" },
  { value: "engineering", label: "Engineering" },
  { value: "marketing", label: "Marketing" },
  { value: "sales", label: "Sales" },
  { value: "operations", label: "Operations" },
  { value: "finance", label: "Finance" },
  { value: "hr", label: "HR" },
  { value: "it", label: "IT" },
  { value: "buyer", label: "Procurement" },
  { value: "logistics", label: "Logistics" },
];

const RESULTS_OPTIONS = [
  { value: "20", label: "20 per query" },
  { value: "40", label: "40 per query" },
  { value: "60", label: "60 per query (max)" },
];

// Preset queries for common German solar use cases
const PRESET_QUERIES = [
  "Solaranlage Installateur Deutschland",
  "Photovoltaik Montage",
  "Solar Handwerker",
  "Solarstrom Installation",
];

const GERMAN_REGIONS = [
  "Bayern", "Baden-Württemberg", "Nordrhein-Westfalen", "Hessen",
  "Niedersachsen", "Sachsen", "Rheinland-Pfalz", "Brandenburg",
  "Berlin", "Hamburg", "München", "Frankfurt", "Stuttgart",
  "Düsseldorf", "Köln", "Leipzig", "Dresden",
];

type Stage = "idle" | "running" | "done" | "failed";

export default function MapsPage() {
  const [keyword, setKeyword] = useState("Solaranlage Installateur");
  const [regions, setRegions] = useState<string[]>(["Bayern", "Baden-Württemberg"]);
  const [regionInput, setRegionInput] = useState("");
  const [maxResults, setMaxResults] = useState("60");
  const [enrichEmails, setEnrichEmails] = useState(true);
  const [categories, setCategories] = useState<DecisionMakerCategory[]>(["ceo"]);
  const [stage, setStage] = useState<Stage>("idle");
  const [jobId, setJobId] = useState<string | null>(null);
  const [progress, setProgress] = useState({ current: 0, total: 0, phase: "" });
  const [results, setResults] = useState<ResultRow[]>([]);
  const { addJob, updateJob, removeJob } = useAppStore();

  // Build the final queries array: one per region
  const queries = regions.length > 0
    ? regions.map(r => `${keyword} ${r}`)
    : [keyword];

  const addRegion = (r: string) => {
    const trimmed = r.trim();
    if (trimmed && !regions.includes(trimmed)) {
      setRegions(prev => [...prev, trimmed]);
    }
    setRegionInput("");
  };

  const removeRegion = (r: string) => setRegions(prev => prev.filter(x => x !== r));

  const startJob = async () => {
    if (!keyword.trim()) return toast.error("Enter a search keyword");
    if (!categories.length && enrichEmails) return toast.error("Select at least one email category");

    setStage("running");
    setResults([]);
    setProgress({ current: 0, total: queries.length, phase: "Searching Google Maps..." });

    try {
      const res = await fetch("/api/jobs/maps-enrich", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          queries,
          maxResultsPerQuery: Number(maxResults),
          languageCode: "de",
          categories,
          enrichEmails,
        }),
      });
      const data = await res.json() as { jobId?: string; error?: string };
      if (!res.ok || !data.jobId) throw new Error(data.error || "Failed");

      setJobId(data.jobId);
      addJob({ id: data.jobId, type: "maps", status: "running", progress: 0, total: queries.length * Number(maxResults) });
      pollJob(data.jobId);
    } catch (err) {
      toast.error(err instanceof Error ? err.message : "Failed to start");
      setStage("failed");
    }
  };

  const pollJob = (id: string) => {
    let phase = "Searching Google Maps...";
    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; results: ResultRow[];
        };

        if (data.totalLeads > 0 && data.emailsFound === 0 && enrichEmails) {
          phase = "Enriching with Anymailfinder...";
        }
        if (data.emailsFound > 0) {
          phase = `Found ${data.emailsFound} emails so far...`;
        }

        setProgress({
          current: enrichEmails ? data.emailsFound : data.totalLeads,
          total: enrichEmails ? data.totalLeads : queries.length * Number(maxResults),
          phase,
        });
        if (data.results?.length) setResults(data.results);
        updateJob(id, { status: data.status, progress: data.emailsFound, total: data.totalLeads });

        if (data.status === "complete" || data.status === "failed") {
          clearInterval(interval);
          removeJob(id);
          setResults(data.results || []);
          if (data.status === "complete") {
            setStage("done");
            const msg = enrichEmails
              ? `Done! ${data.totalLeads} companies found, ${data.emailsFound} emails enriched`
              : `Done! ${data.totalLeads} companies found`;
            toast.success(msg);
          } else {
            setStage("failed");
            toast.error("Job failed. Check your Google Maps API key in Settings.");
          }
        }
      } catch {
        clearInterval(interval);
        setStage("failed");
      }
    }, 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: "maps",
    job_id: jobId || "",
    found_at: new Date().toISOString(),
  }));

  const emailsFound = results.filter(r => r.email).length;
  const hitRate = results.length > 0 ? Math.round((emailsFound / results.length) * 100) : 0;
  const totalExpected = queries.length * Number(maxResults);

  return (
    <div className="space-y-6 max-w-5xl">
      {/* Header */}
      <div className="relative rounded-2xl bg-gradient-to-r from-green-600/10 to-blue-600/10 border border-[#1e1e2e] p-6 overflow-hidden">
        <div className="absolute inset-0 bg-gradient-to-br from-green-500/5 to-transparent" />
        <div className="relative">
          <div className="flex items-center gap-2 text-sm text-green-400 mb-2">
            <MapPin className="w-4 h-4" />
            <span>Tab 4</span>
            <ChevronRight className="w-3 h-3" />
            <span>Google Maps</span>
          </div>
          <h1 className="text-2xl font-bold text-white">Google Maps → Email</h1>
          <p className="text-gray-400 mt-1 text-sm">
            Finde lokale Unternehmen über Google Maps und bereichere sie mit Entscheider-Emails.
          </p>
        </div>
      </div>

      {/* Info banner */}
      <div className="flex items-start gap-3 bg-blue-500/5 border border-blue-500/20 rounded-xl px-4 py-3">
        <Info className="w-4 h-4 text-blue-400 flex-shrink-0 mt-0.5" />
        <p className="text-xs text-blue-300">
          Nutzt die Google Maps Places API (New). Max. 60 Ergebnisse pro Suchanfrage.
          Füge mehrere Regionen hinzu um mehr Ergebnisse zu erhalten.
          <span className="text-gray-400 ml-1">
            $200 Free Credit/Monat ≈ ~6.000 kostenlose Searches.
          </span>
        </p>
      </div>

      {/* Step 1: Search config */}
      <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-green-500/20 text-green-400 text-xs flex items-center justify-center font-bold">1</span>
          Suchanfrage konfigurieren
        </h2>

        {/* Keyword */}
        <div>
          <Label className="text-gray-300 text-sm mb-1.5 block">Suchbegriff</Label>
          <Input
            placeholder="z.B. Solaranlage Installateur"
            value={keyword}
            onChange={e => setKeyword(e.target.value)}
            className="bg-[#0d0d18] border-[#2e2e3e] text-white placeholder:text-gray-600 focus:border-green-500"
          />
          {/* Presets */}
          <div className="flex flex-wrap gap-1.5 mt-2">
            {PRESET_QUERIES.map(q => (
              <button
                key={q}
                onClick={() => setKeyword(q)}
                className={`text-xs px-2.5 py-1 rounded-md border transition-all ${
                  keyword === q
                    ? "bg-green-500/20 text-green-300 border-green-500/40"
                    : "bg-[#0d0d18] text-gray-500 border-[#2e2e3e] hover:border-green-500/30 hover:text-gray-300"
                }`}
              >
                {q}
              </button>
            ))}
          </div>
        </div>

        {/* Regions */}
        <div>
          <Label className="text-gray-300 text-sm mb-1.5 block">
            Regionen / Städte
            <span className="text-gray-500 font-normal ml-2">— je Region eine eigene Suchanfrage</span>
          </Label>

          {/* Region chips */}
          <div className="min-h-[44px] flex flex-wrap gap-2 p-2.5 bg-[#0d0d18] border border-[#2e2e3e] rounded-lg focus-within:border-green-500 transition-colors mb-2">
            {regions.map(r => (
              <span
                key={r}
                className="flex items-center gap-1 bg-green-500/15 text-green-300 border border-green-500/25 rounded-md px-2.5 py-0.5 text-sm"
              >
                {r}
                <button onClick={() => removeRegion(r)} className="hover:text-white transition-colors">
                  <X className="w-3 h-3" />
                </button>
              </span>
            ))}
            <input
              className="flex-1 min-w-[120px] bg-transparent text-sm text-white outline-none placeholder:text-gray-600"
              placeholder="Region eingeben, Enter drücken..."
              value={regionInput}
              onChange={e => setRegionInput(e.target.value)}
              onKeyDown={e => {
                if (e.key === "Enter" || e.key === ",") { e.preventDefault(); addRegion(regionInput); }
              }}
              onBlur={() => regionInput && addRegion(regionInput)}
            />
          </div>

          {/* Region presets */}
          <div className="flex flex-wrap gap-1.5">
            {GERMAN_REGIONS.filter(r => !regions.includes(r)).map(r => (
              <button
                key={r}
                onClick={() => addRegion(r)}
                className="flex items-center gap-1 text-xs px-2 py-0.5 rounded border border-[#2e2e3e] text-gray-500 hover:border-green-500/30 hover:text-gray-300 transition-all"
              >
                <Plus className="w-2.5 h-2.5" /> {r}
              </button>
            ))}
          </div>
        </div>

        {/* Max results + language */}
        <div className="grid grid-cols-2 gap-4">
          <div>
            <Label className="text-gray-300 text-sm mb-1.5 block">Ergebnisse pro Region</Label>
            <Select value={maxResults} onValueChange={v => setMaxResults(v ?? "60")}>
              <SelectTrigger className="bg-[#0d0d18] border-[#2e2e3e] text-white">
                <SelectValue />
              </SelectTrigger>
              <SelectContent className="bg-[#111118] border-[#2e2e3e]">
                {RESULTS_OPTIONS.map(o => (
                  <SelectItem key={o.value} value={o.value} className="text-gray-300">{o.label}</SelectItem>
                ))}
              </SelectContent>
            </Select>
          </div>
          <div className="flex items-end pb-1">
            <p className="text-sm text-gray-500">
              = bis zu{" "}
              <span className="text-white font-semibold">{totalExpected.toLocaleString()}</span>{" "}
              Ergebnisse total ({queries.length} {queries.length === 1 ? "Query" : "Queries"})
            </p>
          </div>
        </div>

        {/* Preview queries */}
        {queries.length > 0 && (
          <div className="bg-[#0d0d18] rounded-lg border border-[#1e1e2e] p-3">
            <p className="text-xs text-gray-500 mb-2">Suchanfragen die ausgeführt werden:</p>
            <div className="space-y-1">
              {queries.slice(0, 5).map((q, i) => (
                <div key={i} className="flex items-center gap-2 text-xs">
                  <span className="w-4 h-4 rounded bg-green-500/20 text-green-400 flex items-center justify-center font-mono text-[10px]">{i+1}</span>
                  <span className="text-gray-300 font-mono">"{q}"</span>
                </div>
              ))}
              {queries.length > 5 && (
                <p className="text-xs text-gray-600 pl-6">+{queries.length - 5} weitere...</p>
              )}
            </div>
          </div>
        )}
      </Card>

      {/* Step 2: Email enrichment */}
      <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-green-500/20 text-green-400 text-xs flex items-center justify-center font-bold">2</span>
          Email Enrichment
        </h2>

        <div className="flex items-start gap-3">
          <Checkbox
            id="enrichEmails"
            checked={enrichEmails}
            onCheckedChange={v => setEnrichEmails(!!v)}
            className="border-[#2e2e3e] mt-0.5"
          />
          <div>
            <label htmlFor="enrichEmails" className="text-sm text-gray-300 cursor-pointer font-medium">
              Direkt mit Anymailfinder anreichern
            </label>
            <p className="text-xs text-gray-500 mt-0.5">
              Entscheider-Emails für alle gefundenen Domains suchen (2 Credits/gültige Email)
            </p>
          </div>
        </div>

        {enrichEmails && (
          <div className="flex flex-wrap gap-2 pl-6">
            {CATEGORY_OPTIONS.map(opt => (
              <button
                key={opt.value}
                onClick={() => setCategories(prev =>
                  prev.includes(opt.value) ? prev.filter(c => c !== opt.value) : [...prev, opt.value]
                )}
                className={`px-3 py-1.5 rounded-lg text-sm font-medium border transition-all ${
                  categories.includes(opt.value)
                    ? "bg-green-500/20 text-green-300 border-green-500/40"
                    : "bg-[#0d0d18] text-gray-400 border-[#2e2e3e] hover:border-green-500/30"
                }`}
              >
                {opt.label}
              </button>
            ))}
          </div>
        )}
      </Card>

      {/* Step 3: Run */}
      <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-green-500/20 text-green-400 text-xs flex items-center justify-center font-bold">3</span>
          Starten
        </h2>

        {stage === "idle" || stage === "failed" ? (
          <Button
            onClick={startJob}
            disabled={!keyword.trim() || (!categories.length && enrichEmails)}
            className="bg-gradient-to-r from-green-500 to-blue-600 hover:from-green-600 hover:to-blue-700 text-white font-medium px-8 shadow-lg hover:shadow-green-500/25 transition-all"
          >
            <MapPin className="w-4 h-4 mr-2" />
            Google Maps durchsuchen
          </Button>
        ) : stage === "running" ? (
          <ProgressCard
            title={progress.phase || "Läuft..."}
            current={progress.current}
            total={progress.total || totalExpected}
            subtitle={enrichEmails ? "Google Maps → Anymailfinder Bulk Enrichment" : "Google Maps Suche läuft..."}
            status="running"
          />
        ) : (
          <ProgressCard
            title="Fertig"
            current={enrichEmails ? emailsFound : results.length}
            total={results.length}
            subtitle={enrichEmails ? `Hit Rate: ${hitRate}%` : `${results.length} Unternehmen gefunden`}
            status="complete"
          />
        )}
      </Card>

      {/* Results */}
      {results.length > 0 && (
        <Card className="bg-[#111118] border-[#1e1e2e] p-6 space-y-4">
          <div className="flex items-center justify-between flex-wrap gap-3">
            <h2 className="text-base font-semibold text-white">
              Ergebnisse ({results.length} Unternehmen{enrichEmails && emailsFound > 0 ? `, ${emailsFound} Emails` : ""})
            </h2>
            <ExportButtons
              rows={exportRows}
              filename={`maps-leads-${jobId?.slice(0, 8) || "export"}`}
              summary={enrichEmails ? `${emailsFound} Emails · ${hitRate}% Hit Rate` : `${results.length} Unternehmen`}
            />
          </div>
          <ResultsTable
            rows={results}
            loading={stage === "running" && results.length === 0}
            extraColumns={[
              { key: "address", label: "Adresse" },
              { key: "phone", label: "Telefon" },
            ]}
          />
        </Card>
      )}

      {stage === "idle" && (
        <EmptyState
          icon={MapPin}
          title="Suchbegriff eingeben und starten"
          description="Gib einen Suchbegriff und Regionen ein um lokale Unternehmen über Google Maps zu finden und deren Entscheider-Emails anzureichern."
        />
      )}
    </div>
  );
}