"use client";

import { useEffect, useState } from "react";
import { useRouter } from "next/navigation";
import { Plus } from "lucide-react";
import { BrandProductPicker } from "@/components/product-profile/brand-product-picker";
import { Button } from "@/components/ui/button";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";
import { InlineAlert } from "@/components/ui/inline-alert";
import type { ActionFeedback } from "@/lib/use-action-feedback";
import type { TopicGoal } from "@/lib/types/topic-goal";
import { parseFetchJson } from "@/lib/utils";

interface TopicFormDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  defaultGoal: TopicGoal;
  onCreated?: () => void;
}

export function TopicFormDialog({
  open,
  onOpenChange,
  defaultGoal,
  onCreated,
}: TopicFormDialogProps) {
  const router = useRouter();
  const [label, setLabel] = useState("");
  const [query, setQuery] = useState("");
  const [brief, setBrief] = useState("");
  const topicGoal = defaultGoal;
  const [brandProfileId, setBrandProfileId] = useState<string | null>(null);
  const [productProfileId, setProductProfileId] = useState<string | null>(null);
  const [productContext, setProductContext] = useState("");
  const [submitting, setSubmitting] = useState(false);
  const [formFeedback, setFormFeedback] = useState<ActionFeedback | null>(null);

  useEffect(() => {
    if (!open) return;
    setLabel("");
    setQuery("");
    setBrief("");
    setBrandProfileId(null);
    setProductProfileId(null);
    setProductContext("");
    setFormFeedback(null);
  }, [open, defaultGoal]);

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    if (!label.trim() || !query.trim()) {
      setFormFeedback({ type: "warning", message: "請填寫主題名稱與種子關鍵字。" });
      return;
    }

    if (topicGoal === "placement" && !brandProfileId) {
      setFormFeedback({ type: "warning", title: "請選擇品牌", message: "置入模式需先選擇品牌。" });
      return;
    }

    setFormFeedback(null);
    setSubmitting(true);
    const res = await fetch("/api/topics", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        label: label.trim(),
        query: query.trim(),
        brief: brief.trim() || undefined,
        topicGoal,
        brandProfileId: topicGoal === "placement" ? brandProfileId : undefined,
        productProfileId: topicGoal === "placement" ? productProfileId : undefined,
        productContext: topicGoal === "placement" ? productContext : undefined,
      }),
    });
    let data: { error?: string; topic?: { id: string } } = {};
    try {
      data = await parseFetchJson(res);
    } catch (err) {
      setSubmitting(false);
      setFormFeedback({
        type: "error",
        title: "建立失敗",
        message: err instanceof Error ? err.message : "伺服器回應異常",
      });
      return;
    }
    if (!res.ok) {
      setSubmitting(false);
      setFormFeedback({
        type: "error",
        title: "建立失敗",
        message: data.error ?? "無法建立主題",
      });
      return;
    }

    const topicId = data.topic?.id;
    if (!topicId) {
      setSubmitting(false);
      setFormFeedback({ type: "error", title: "建立失敗", message: "未取得主題編號" });
      return;
    }

    const analyzeRes = await fetch("/api/analyze-topic", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ topicId, brief: brief.trim() || undefined }),
    });
    setSubmitting(false);

    onCreated?.();
    onOpenChange(false);
    if (analyzeRes.ok) window.dispatchEvent(new Event("haixun:jobs-updated"));
    router.push(`/scans/${topicId}?mode=${topicGoal}`);
  }

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="w-[min(100vw-2rem,36rem)]">
        <DialogHeader>
          <DialogTitle>{topicGoal === "placement" ? "新增找 TA 任務" : "新增拷貝忍者任務"}</DialogTitle>
          <DialogDescription>建立後會自動開始 AI 分析；完成後確認標籤，就能直接海巡。</DialogDescription>
        </DialogHeader>

        <form onSubmit={handleSubmit} className="space-y-4">
          {formFeedback && (
            <InlineAlert
              type={formFeedback.type}
              title={formFeedback.title}
              message={formFeedback.message}
              onDismiss={() => setFormFeedback(null)}
            />
          )}
          <div className="grid gap-4 sm:grid-cols-2">
            <div className="space-y-1.5">
              <Label>名稱</Label>
              <Input
                value={label}
                onChange={(e) => setLabel(e.target.value)}
                placeholder="居家狗狗洗澡"
                autoFocus
              />
            </div>
            <div className="space-y-1.5">
              <Label>種子關鍵字</Label>
              <Input value={query} onChange={(e) => setQuery(e.target.value)} placeholder="狗狗洗澡" />
            </div>
          </div>

          <div className="space-y-1.5">
            <Label>Brief（建議填）</Label>
            <Textarea
              value={brief}
              onChange={(e) => setBrief(e.target.value)}
              rows={2}
              placeholder={
                topicGoal === "placement"
                  ? "想服務誰、什麼情境"
                  : "你是誰、想服務誰、內容方向"
              }
            />
          </div>

          {topicGoal === "placement" && (
            <div className="rounded-lg border border-border bg-muted/30 p-3">
              <BrandProductPicker
                brandId={brandProfileId}
                productId={productProfileId}
                onChange={({ brandId, productId, context }) => {
                  setBrandProfileId(brandId);
                  setProductProfileId(productId);
                  if (context) setProductContext(context);
                }}
              />
            </div>
          )}

          <DialogFooter>
            <Button type="button" variant="ghost" onClick={() => onOpenChange(false)}>
              取消
            </Button>
            <Button type="submit" disabled={submitting}>
              {submitting ? "建立並分析中…" : (
                <>
                  <Plus className="h-4 w-4" />
                  建立並分析
                </>
              )}
            </Button>
          </DialogFooter>
        </form>
      </DialogContent>
    </Dialog>
  );
}