"use client";

import { useState, useCallback } from "react";
import { StatusBadge } from "./StatusBadge";
import { StatusPopover } from "./StatusPopover";
import { LeadSidePanel } from "./LeadSidePanel";

export interface Lead {
  id: string;
  domain: string | null;
  companyName: string | null;
  contactName: string | null;
  contactTitle: string | null;
  email: string | null;
  linkedinUrl: string | null;
  phone: string | null;
  address: string | null;
  sourceTab: string;
  sourceTerm: string | null;
  sourceJobId: string | null;
  serpTitle: string | null;
  serpSnippet: string | null;
  serpRank: number | null;
  serpUrl: string | null;
  status: string;
  priority: string;
  notes: string | null;
  tags: string | null;
  country: string | null;
  headcount: string | null;
  industry: string | null;
  description: string | null;
  capturedAt: string;
  contactedAt: string | null;
}

interface LeadsTableProps {
  leads: Lead[];
  selected: Set<string>;
  onToggleSelect: (id: string) => void;
  onToggleAll: () => void;
  allSelected: boolean;
  onLeadUpdate: (id: string, updates: Partial<Lead>) => void;
}

function relativeDate(iso: string): string {
  const now = new Date();
  const d = new Date(iso);
  const diffMs = now.getTime() - d.getTime();
  const diffDays = Math.floor(diffMs / (1000 * 60 * 60 * 24));
  if (diffDays === 0) return "heute";
  if (diffDays === 1) return "gestern";
  if (diffDays < 7) return `vor ${diffDays} Tagen`;
  const diffWeeks = Math.floor(diffDays / 7);
  if (diffWeeks < 5) return `vor ${diffWeeks} Woche${diffWeeks > 1 ? "n" : ""}`;
  const diffMonths = Math.floor(diffDays / 30);
  return `vor ${diffMonths} Monat${diffMonths > 1 ? "en" : ""}`;
}

function fullDate(iso: string): string {
  return new Date(iso).toLocaleDateString("de-DE", {
    day: "2-digit",
    month: "2-digit",
    year: "numeric",
  });
}

interface StatusCellProps {
  lead: Lead;
  onUpdate: (id: string, updates: Partial<Lead>) => void;
}

function StatusCell({ lead, onUpdate }: StatusCellProps) {
  const [open, setOpen] = useState(false);

  async function handleSelect(newStatus: string) {
    // Optimistic update
    onUpdate(lead.id, { status: newStatus });
    try {
      await fetch(`/api/leads/${lead.id}`, {
        method: "PATCH",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ status: newStatus }),
      });
    } catch {
      // revert on error
      onUpdate(lead.id, { status: lead.status });
    }
  }

  return (
    <div style={{ position: "relative", display: "inline-block" }}>
      <StatusBadge status={lead.status} onClick={() => setOpen((v) => !v)} />
      {open && (
        <StatusPopover
          currentStatus={lead.status}
          onSelect={handleSelect}
          onClose={() => setOpen(false)}
        />
      )}
    </div>
  );
}

export function LeadsTable({
  leads,
  selected,
  onToggleSelect,
  onToggleAll,
  allSelected,
  onLeadUpdate,
}: LeadsTableProps) {
  const [sidePanelLead, setSidePanelLead] = useState<Lead | null>(null);
  const [copiedId, setCopiedId] = useState<string | null>(null);

  const handleCopyEmail = useCallback(async (lead: Lead, e: React.MouseEvent) => {
    e.stopPropagation();
    if (!lead.email) return;
    await navigator.clipboard.writeText(lead.email);
    setCopiedId(lead.id);
    setTimeout(() => setCopiedId(null), 1500);
  }, []);

  async function handleMarkContacted(lead: Lead) {
    onLeadUpdate(lead.id, { status: "contacted" });
    try {
      await fetch(`/api/leads/${lead.id}`, {
        method: "PATCH",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ status: "contacted" }),
      });
    } catch {
      onLeadUpdate(lead.id, { status: lead.status });
    }
  }

  const thStyle: React.CSSProperties = {
    padding: "10px 16px",
    fontSize: 11,
    fontWeight: 500,
    color: "#6b7280",
    textTransform: "uppercase",
    letterSpacing: "0.05em",
    textAlign: "left",
    whiteSpace: "nowrap",
    background: "#0d0d18",
    borderBottom: "1px solid #1e1e2e",
  };

  return (
    <>
      <div style={{ overflowX: "auto" }}>
        <table style={{ width: "100%", borderCollapse: "collapse" }}>
          <thead>
            <tr>
              <th style={{ ...thStyle, width: 40 }}>
                <input
                  type="checkbox"
                  checked={allSelected && leads.length > 0}
                  onChange={onToggleAll}
                  style={{ cursor: "pointer", accentColor: "#3b82f6" }}
                />
              </th>
              <th style={thStyle}>Unternehmen</th>
              <th style={thStyle}>E-Mail</th>
              <th style={thStyle}>Branche</th>
              <th style={thStyle}>Region</th>
              <th style={thStyle}>Status</th>
              <th style={thStyle}>Gefunden am</th>
              <th style={{ ...thStyle, textAlign: "right" }}>Aktionen</th>
            </tr>
          </thead>
          <tbody>
            {leads.map((lead) => {
              const isSelected = selected.has(lead.id);
              const isNew = lead.status === "new";
              return (
                <tr
                  key={lead.id}
                  style={{
                    background: isSelected ? "rgba(59,130,246,0.04)" : "transparent",
                    borderBottom: "1px solid #1e1e2e",
                    transition: "background 0.1s",
                  }}
                  onMouseEnter={(e) => {
                    if (!isSelected) (e.currentTarget as HTMLTableRowElement).style.background = "#0d0d18";
                  }}
                  onMouseLeave={(e) => {
                    if (!isSelected) (e.currentTarget as HTMLTableRowElement).style.background = "transparent";
                  }}
                >
                  {/* Checkbox */}
                  <td style={{ padding: "11px 16px", width: 40 }}>
                    <input
                      type="checkbox"
                      checked={isSelected}
                      onChange={() => onToggleSelect(lead.id)}
                      style={{ cursor: "pointer", accentColor: "#3b82f6" }}
                    />
                  </td>

                  {/* Unternehmen */}
                  <td style={{ padding: "11px 16px", maxWidth: 200 }}>
                    <div style={{ fontSize: 13, fontWeight: 500, color: "#ffffff", marginBottom: 1 }}>
                      {lead.companyName || lead.domain || "—"}
                    </div>
                    {lead.domain && lead.companyName && (
                      <div style={{ fontSize: 11, color: "#6b7280" }}>{lead.domain}</div>
                    )}
                  </td>

                  {/* Email */}
                  <td style={{ padding: "11px 16px", maxWidth: 220 }}>
                    {lead.email ? (
                      <div
                        className="email-cell"
                        style={{ display: "flex", alignItems: "center", gap: 6 }}
                      >
                        <span
                          style={{
                            fontFamily: "monospace",
                            fontSize: 11,
                            color: "#3b82f6",
                            wordBreak: "break-all",
                          }}
                        >
                          {lead.email}
                        </span>
                        <button
                          onClick={(e) => handleCopyEmail(lead, e)}
                          title="Kopieren"
                          style={{
                            background: "transparent",
                            border: "none",
                            cursor: "pointer",
                            padding: 2,
                            color: copiedId === lead.id ? "#22c55e" : "#6b7280",
                            flexShrink: 0,
                            fontSize: 11,
                          }}
                        >
                          {copiedId === lead.id ? "✓" : "⎘"}
                        </button>
                      </div>
                    ) : (
                      <span style={{ fontSize: 11, color: "#6b7280" }}>— nicht gefunden</span>
                    )}
                  </td>

                  {/* Branche */}
                  <td style={{ padding: "11px 16px" }}>
                    <span style={{ fontSize: 12, color: "#9ca3af" }}>
                      {lead.industry || "—"}
                    </span>
                  </td>

                  {/* Region */}
                  <td style={{ padding: "11px 16px" }}>
                    <span style={{ fontSize: 12, color: "#9ca3af" }}>
                      {lead.address ?? lead.sourceTerm ?? "—"}
                    </span>
                  </td>

                  {/* Status */}
                  <td style={{ padding: "11px 16px" }}>
                    <StatusCell lead={lead} onUpdate={onLeadUpdate} />
                  </td>

                  {/* Gefunden am */}
                  <td style={{ padding: "11px 16px" }}>
                    <span
                      style={{ fontSize: 12, color: "#9ca3af" }}
                      title={fullDate(lead.capturedAt)}
                    >
                      {relativeDate(lead.capturedAt)}
                    </span>
                  </td>

                  {/* Aktionen */}
                  <td style={{ padding: "11px 16px", textAlign: "right", whiteSpace: "nowrap" }}>
                    <div style={{ display: "flex", gap: 6, justifyContent: "flex-end" }}>
                      {/* Primary action */}
                      <button
                        onClick={() => (isNew ? handleMarkContacted(lead) : undefined)}
                        style={{
                          background: isNew ? "rgba(59,130,246,0.12)" : "#0d0d18",
                          border: `1px solid ${isNew ? "rgba(59,130,246,0.3)" : "#2e2e3e"}`,
                          borderRadius: 6,
                          padding: "4px 10px",
                          fontSize: 11,
                          color: isNew ? "#93c5fd" : "#9ca3af",
                          cursor: "pointer",
                          transition: "all 0.1s",
                        }}
                      >
                        {isNew ? "Kontaktiert ✓" : "Status ändern"}
                      </button>
                      {/* Notiz */}
                      <button
                        onClick={() => setSidePanelLead(lead)}
                        style={{
                          background: "#0d0d18",
                          border: "1px solid #2e2e3e",
                          borderRadius: 6,
                          padding: "4px 10px",
                          fontSize: 11,
                          color: "#9ca3af",
                          cursor: "pointer",
                        }}
                      >
                        Notiz
                      </button>
                    </div>
                  </td>
                </tr>
              );
            })}
          </tbody>
        </table>
      </div>

      {/* Side panel */}
      {sidePanelLead && (
        <LeadSidePanel
          lead={sidePanelLead}
          onClose={() => setSidePanelLead(null)}
          onUpdate={(id, updates) => {
            onLeadUpdate(id, updates);
            setSidePanelLead((prev) => (prev && prev.id === id ? { ...prev, ...updates } : prev));
          }}
        />
      )}
    </>
  );
}