"use client";

import { useMemo, useState } from "react";
import { convertLexicalToPlaintext } from "@payloadcms/richtext-lexical/plaintext";
import type { Ticket } from "@/payload-types";
import { Badge } from "@/components/ui/badge";
import { Item, ItemContent, ItemDescription, ItemMedia, ItemTitle } from "@/components/ui/item";
import { Input } from "@/components/ui/input";
import { Tabs, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { CreateTicketDialog } from "@/components/frontend/helpdesk/CreateTicketDialog";
import { TicketCard } from "@/components/frontend/helpdesk/TicketCard";
import { CLOSING_STATUSES, STATUS_STYLES, type TicketStatus } from "@/lib/tickets/ticketMeta";
import { InboxIcon, SearchIcon } from "lucide-react";
import { cn } from "@/lib/utils";

type TicketFilter = "all" | "open" | "resolved" | "closed" | "unassigned";

interface TicketsViewProps {
  readonly tickets: readonly Ticket[];
  readonly currentUserId: number;
  readonly isStaff: boolean;
}

const OPEN_STATUSES: readonly TicketStatus[] = [
  "open",
  "in_review",
  "planning",
  "in_progress",
  "waiting_on_reporter",
  "in_testing",
];

const FILTER_OPTIONS = [
  { label: "All", value: "all" },
  { label: "Open", value: "open" },
  { label: "Resolved", value: "resolved" },
  { label: "Closed", value: "closed" },
  { label: "Unassigned", value: "unassigned" },
] as const satisfies readonly { label: string; value: TicketFilter }[];

function isTicketFilter(value: string): value is TicketFilter {
  return FILTER_OPTIONS.some((option) => option.value === value);
}

function isOpenTicket(ticket: Ticket): boolean {
  return OPEN_STATUSES.includes(ticket.status);
}

function isUnassignedTicket(ticket: Ticket): boolean {
  return (
    (ticket.assignee === null || ticket.assignee === undefined) &&
    !CLOSING_STATUSES.includes(ticket.status)
  );
}

export function TicketsView({ tickets, currentUserId: _currentUserId, isStaff }: TicketsViewProps) {
  const [activeFilter, setActiveFilter] = useState<TicketFilter>("all");
  const [search, setSearch] = useState("");

  const counts = useMemo<Record<TicketFilter, number>>(
    () => ({
      all: tickets.length,
      open: tickets.filter(isOpenTicket).length,
      resolved: tickets.filter((ticket) => ticket.status === "resolved").length,
      closed: tickets.filter((ticket) => ticket.status === "canceled" || ticket.status === "closed")
        .length,
      unassigned: tickets.filter(isUnassignedTicket).length,
    }),
    [tickets],
  );

  const filteredTickets = useMemo(() => {
    const query = search.trim().toLowerCase();
    return tickets.filter((ticket) => {
      const matchesFilter =
        activeFilter === "all" ||
        (activeFilter === "open" && isOpenTicket(ticket)) ||
        (activeFilter === "resolved" && ticket.status === "resolved") ||
        (activeFilter === "closed" &&
          (ticket.status === "canceled" || ticket.status === "closed")) ||
        (activeFilter === "unassigned" && isUnassignedTicket(ticket));
      if (!matchesFilter) return false;
      if (!query) return true;

      const description = convertLexicalToPlaintext({ data: ticket.description });
      return `${ticket.title} ${description}`.toLowerCase().includes(query);
    });
  }, [activeFilter, search, tickets]);

  const visibleFilters = isStaff
    ? FILTER_OPTIONS
    : FILTER_OPTIONS.filter((option) => option.value !== "unassigned");

  // Helper to derive a small per-filter class from STATUS_STYLES.
  // STATUS_STYLES is keyed by TicketStatus and contains a space-separated
  // class string (e.g. "bg-emerald-50 text-emerald-700"). The original
  // implementation attempted to build a complex mapping but had type errors
  // and didn't return values from the map. Keep this simple and typed: pick
  // the second token (usually the foreground color) when available.
  const statusStyles = STATUS_STYLES as Record<string, string>;

  function classForFilter(filter: TicketFilter): string {
    switch (filter) {
      case "open":
        return (statusStyles.open ?? "").split(" ")[1] ?? "";
      case "resolved":
        return (statusStyles.resolved ?? "").split(" ")[1] ?? "";
      case "closed":
        // prefer explicit closed style, fall back to canceled if present
        return (statusStyles.closed ?? statusStyles.canceled ?? "").split(" ")[1] ?? "";
      case "unassigned":
        return "text-muted-foreground";
      case "all":
      default:
        return "";
    }
  }

  return (
    <div className="flex flex-col gap-5">
      <div className="flex flex-wrap items-end justify-between gap-3">
        <div className="flex flex-col gap-1">
          <div className="flex items-center gap-2">
            <h2 className="text-sm font-semibold uppercase tracking-wider text-muted-foreground">
              {isStaff ? "Ticket queue" : "Your tickets"}
            </h2>
            <span className="text-xs text-muted-foreground">{tickets.length} total</span>
          </div>
          <p className="text-sm text-muted-foreground">
            {isStaff
              ? "Review incoming requests and keep members updated."
              : "Keep an eye on your open requests."}
          </p>
        </div>
        <CreateTicketDialog />
      </div>

      <div className="flex flex-col gap-3 lg:flex-row lg:items-center lg:justify-between">
        <Tabs
          value={activeFilter}
          onValueChange={(value) => {
            if (isTicketFilter(value)) setActiveFilter(value);
          }}
        >
          <TabsList className="max-w-full justify-start sm:w-fit gap-1">
            {visibleFilters.map((option) => (
              <TabsTrigger
                key={option.value}
                value={option.value}
                className={cn("flex-none", classForFilter(option.value))}
              >
                {option.label}
                <Badge variant="secondary" className="px-1.5 text-[10px]">
                  {counts[option.value]}
                </Badge>
              </TabsTrigger>
            ))}
          </TabsList>
        </Tabs>

        <div className="relative w-full lg:max-w-xs">
          <SearchIcon className="pointer-events-none absolute left-2.5 top-1/2 size-4 -translate-y-1/2 text-muted-foreground" />
          <Input
            aria-label="Search tickets"
            className="pl-8"
            placeholder="Search tickets..."
            value={search}
            onChange={(event) => setSearch(event.target.value)}
          />
        </div>
      </div>

      {filteredTickets.length === 0 ? (
        <Item variant="outline" className="">
          <ItemMedia variant="icon">
            <InboxIcon className="text-muted-foreground" />
          </ItemMedia>
          <ItemContent className="items-center gap-1">
            <ItemTitle>{tickets.length === 0 ? "No tickets yet" : "No matching tickets"}</ItemTitle>
            <ItemDescription>
              {tickets.length === 0
                ? "Create a ticket to send a request to the helpdesk."
                : "Try a different filter or search phrase."}
            </ItemDescription>
          </ItemContent>
        </Item>
      ) : (
        <div className="grid grid-cols-1 gap-3 xl:grid-cols-2">
          {filteredTickets.map((ticket) => (
            <TicketCard key={ticket.id} ticket={ticket} />
          ))}
        </div>
      )}
    </div>
  );
}