"use client";

// ============================================================================
// Project Selector (Multi-select)
// ============================================================================

import * as React from "react";
import { Check, ChevronsUpDown, Tv, X } from "lucide-react";
import { Button } from "@/components/ui/button";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuTrigger,
  DropdownMenuSeparator,
} from "@/components/ui/dropdown-menu";
import { Checkbox } from "@/components/ui/checkbox";
import { Badge } from "@/components/ui/badge";
import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
import { useWorkspace } from "@/components/providers/workspace-provider";
import { cn } from "@/lib/utils";

export const ProjectSelector: React.FC = () => {
  const {
    projects,
    selectedProjects,
    toggleProject,
    selectAllProjects,
    clearProjectSelection,
    isLoadingProjects,
  } = useWorkspace();

  if (isLoadingProjects) {
    return (
      <div className="w-[240px] h-10 rounded-lg border border-input bg-background animate-pulse" />
    );
  }

  if (projects.length === 0) {
    return (
      <div className="text-sm text-muted-foreground px-3 py-2">
        Нет проектов
      </div>
    );
  }

  const allSelected = selectedProjects.length === projects.length;

  const getAvatarUrl = (project: typeof projects[0]) => {
    return project.username
      ? `https://t.me/i/userpic/320/${project.username}.jpg`
      : null;
  };

  return (
    <DropdownMenu>
      <DropdownMenuTrigger asChild>
        <Button
          variant="outline"
          className="w-[240px] h-10 px-3 rounded-lg justify-start gap-2"
        >
          {selectedProjects.length === 0 ? (
            <>
              <span className="text-muted-foreground">Все проекты</span>
            </>
          ) : selectedProjects.length === 1 ? (
            <>
              <Avatar className="h-6 w-6 shrink-0">
                <AvatarImage src={getAvatarUrl(selectedProjects[0]) || undefined} />
                <AvatarFallback className="text-xs">
                  {selectedProjects[0].title.charAt(0).toUpperCase()}
                </AvatarFallback>
              </Avatar>
              <span className="truncate max-w-[180px]">
                {selectedProjects[0].title}
              </span>
            </>
          ) : allSelected ? (
            <>
              <span className="font-medium">Все проекты</span>
            </>
          ) : (
            <>
              <Avatar className="h-6 w-6 shrink-0">
                <AvatarFallback className="text-xs">
                  {selectedProjects.length}
                </AvatarFallback>
              </Avatar>
              <span className="truncate max-w-[180px]">
                {selectedProjects.length} проекта
              </span>
            </>
          )}
          <ChevronsUpDown className="h-4 w-4 shrink-0 opacity-50 ml-auto" />
        </Button>
      </DropdownMenuTrigger>

      <DropdownMenuContent className="w-[240px] p-2" align="start">
        {/* Quick actions */}
        <div className="flex gap-2 mb-2">
          <Button
            variant="ghost"
            size="sm"
            className="flex-1 text-xs"
            onClick={selectAllProjects}
            disabled={allSelected}
          >
            Выбрать все
          </Button>
          <Button
            variant="ghost"
            size="sm"
            className="flex-1 text-xs"
            onClick={clearProjectSelection}
            disabled={selectedProjects.length <= 1}
          >
            Сбросить
          </Button>
        </div>

        <DropdownMenuSeparator />

        {/* Projects list */}
        <div className="max-h-[300px] overflow-y-auto">
          {projects.map((project) => {
            const isSelected = selectedProjects.some((p) => p.id === project.id);
            const isOnlyOne = selectedProjects.length === 1 && isSelected;

            return (
              <div
                key={project.id}
                className={cn(
                  "flex items-center gap-2 px-2 py-1.5 rounded-md cursor-pointer hover:bg-accent",
                  isSelected && "bg-accent/50"
                )}
                onClick={() => !isOnlyOne && toggleProject(project)}
              >
                <Checkbox
                  checked={isSelected}
                  disabled={isOnlyOne}
                  onCheckedChange={() => !isOnlyOne && toggleProject(project)}
                  className="shrink-0"
                />
                <Avatar className="h-5 w-5 shrink-0">
                  <AvatarImage src={getAvatarUrl(project) || undefined} />
                  <AvatarFallback className="text-[10px]">
                    {project.title.charAt(0).toUpperCase()}
                  </AvatarFallback>
                </Avatar>
                <span className="truncate text-sm">{project.title}</span>
              </div>
            );
          })}
        </div>
      </DropdownMenuContent>
    </DropdownMenu>
  );
};