"use client";

import {
  Braces,
  ChevronLeft,
  MoreVertical,
  Pencil,
  Settings2,
  Share2,
  Wand2,
} from "lucide-react";
import { AnimatePresence, motion } from "motion/react";
import { Button } from "@/components/ui/button";
import { Card } from "@/components/ui/card";
import { AgentPreviewPanel } from "./agent-preview-panel";
import { AgentThread } from "./agent-thread";
import { ChatComposer } from "./chat-composer";
import { ChatEmptyState } from "./chat-empty-state";
import {
  agentFadeIn,
  agentLayoutTransition,
} from "./agent-motion";
import {
  AGENT_BREADCRUMB,
  AGENT_WORKSPACE_TITLE,
} from "./playground-content";
import type { ChatMessage } from "./types";
import type { ToolsTab } from "./playground-tools-sheet";
import { cn } from "@/lib/utils";
import { type } from "@/lib/typography";

interface ChatPanelProps {
  messages: ChatMessage[];
  inputValue: string;
  onInputChange: (value: string) => void;
  onSubmit: () => void;
  onStarterSelect: (id: string, prompt: string) => void;
  onOpenTools: (tab: ToolsTab) => void;
  isSending?: boolean;
  isTyping?: boolean;
  bottomRef?: React.RefObject<HTMLDivElement | null>;
  className?: string;
}

function AgentHeader({
  onOpenTools,
}: {
  onOpenTools: (tab: ToolsTab) => void;
}) {
  return (
    <div className="shrink-0 border-b bg-card">
      <div className="flex items-center gap-1.5 px-4 py-2 sm:px-5">
        <span className={cn(type.caption, "text-muted-foreground")}>
          {AGENT_BREADCRUMB.parent}
        </span>
        <ChevronLeft className="size-3 rotate-180 text-muted-foreground/60" aria-hidden />
        <span className={cn(type.caption, "font-medium text-foreground")}>
          {AGENT_BREADCRUMB.current}
        </span>
      </div>

      <div className="flex items-center justify-between gap-3 border-t bg-muted/20 px-4 py-2.5 sm:px-5">
        <h2 className={cn("min-w-0 truncate", type["card-title"])}>
          {AGENT_WORKSPACE_TITLE}
        </h2>

        <div className="flex shrink-0 items-center gap-0.5">
          <Button
            type="button"
            variant="ghost"
            size="icon-sm"
            className="text-muted-foreground"
            aria-label="ویرایش"
          >
            <Pencil className="size-3.5" aria-hidden />
          </Button>
          <Button
            type="button"
            variant="ghost"
            size="icon-sm"
            className="text-muted-foreground"
            aria-label="اشتراک‌گذاری"
          >
            <Share2 className="size-3.5" aria-hidden />
          </Button>
          <Button
            type="button"
            variant="ghost"
            size="icon-sm"
            className="text-muted-foreground"
            aria-label="گزینه‌های بیشتر"
          >
            <MoreVertical className="size-3.5" aria-hidden />
          </Button>

          <div className="mx-1 hidden h-4 w-px bg-border sm:block" aria-hidden />

          <Button
            type="button"
            variant="ghost"
            size="sm"
            className="hidden h-8 gap-1.5 px-2 sm:inline-flex"
            onClick={() => onOpenTools("scenarios")}
            aria-label="سناریوها"
          >
            <Wand2 className="size-3.5 shrink-0" aria-hidden />
            <span className={type.caption}>سناریوها</span>
          </Button>
          <Button
            type="button"
            variant="ghost"
            size="icon-sm"
            className="sm:hidden"
            onClick={() => onOpenTools("scenarios")}
            aria-label="سناریوها"
          >
            <Wand2 className="size-3.5" aria-hidden />
          </Button>
          <Button
            type="button"
            variant="ghost"
            size="sm"
            className="hidden h-8 gap-1.5 px-2 sm:inline-flex"
            onClick={() => onOpenTools("settings")}
            aria-label="تنظیمات"
          >
            <Settings2 className="size-3.5 shrink-0" aria-hidden />
            <span className={type.caption}>تنظیمات</span>
          </Button>
          <Button
            type="button"
            variant="ghost"
            size="icon-sm"
            className="sm:hidden"
            onClick={() => onOpenTools("settings")}
            aria-label="تنظیمات"
          >
            <Settings2 className="size-3.5" aria-hidden />
          </Button>
          <Button
            type="button"
            variant="ghost"
            size="sm"
            className="hidden h-8 gap-1.5 px-2 sm:inline-flex"
            onClick={() => onOpenTools("output")}
            aria-label="خروجی"
          >
            <Braces className="size-3.5 shrink-0" aria-hidden />
            <span className={type.caption}>خروجی</span>
          </Button>
          <Button
            type="button"
            variant="ghost"
            size="icon-sm"
            className="sm:hidden"
            onClick={() => onOpenTools("output")}
            aria-label="خروجی"
          >
            <Braces className="size-3.5" aria-hidden />
          </Button>
        </div>
      </div>
    </div>
  );
}

export function ChatPanel({
  messages,
  inputValue,
  onInputChange,
  onSubmit,
  onStarterSelect,
  onOpenTools,
  isSending = false,
  isTyping = false,
  bottomRef,
  className,
}: ChatPanelProps) {
  const showEmptyState = messages.length === 0 && !isTyping;
  const showPreview = messages.length > 0 || isTyping;

  return (
    <Card
      className={cn(
        "flex min-h-[min(70dvh,42rem)] flex-col gap-0 overflow-hidden border-border/80 bg-muted/30 py-0 shadow-sm md:min-h-[min(75dvh,48rem)]",
        className
      )}
    >
      <AgentHeader onOpenTools={onOpenTools} />

      <motion.div
        layout
        className="flex min-h-0 flex-1 flex-col lg:flex-row"
        transition={agentLayoutTransition}
      >
        <motion.div
          layout
          className="flex min-h-0 min-w-0 flex-1 flex-col bg-background/60"
          transition={agentLayoutTransition}
        >
          <div className="relative min-h-0 flex-1">
            <AnimatePresence mode="sync">
              {showEmptyState ? (
                <motion.div
                  key="empty"
                  className="absolute inset-0 flex flex-col"
                  variants={agentFadeIn}
                  initial="hidden"
                  animate="visible"
                  exit="exit"
                >
                  <ChatEmptyState
                    onSelectStarter={onStarterSelect}
                    disabled={isSending}
                    className="flex-1"
                  />
                </motion.div>
              ) : (
                <motion.div
                  key="thread"
                  className="absolute inset-0 flex flex-col"
                  variants={agentFadeIn}
                  initial="hidden"
                  animate="visible"
                  exit="exit"
                >
                  <AgentThread
                    messages={messages}
                    isTyping={isTyping}
                    bottomRef={bottomRef}
                  />
                </motion.div>
              )}
            </AnimatePresence>
          </div>

          <motion.div layout transition={agentLayoutTransition}>
            <ChatComposer
              value={inputValue}
              onChange={onInputChange}
              onSubmit={onSubmit}
              disabled={false}
              isSending={isSending}
            />
          </motion.div>
        </motion.div>

        <AnimatePresence>
          {showPreview && (
            <AgentPreviewPanel key="preview" className="hidden lg:flex" />
          )}
        </AnimatePresence>
      </motion.div>
    </Card>
  );
}