"use client";

import { useState } from "react";
import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";
import { Card, CardContent } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import {
  Loader2,
  Sparkles,
  ArrowRight,
  Activity,
  AlertTriangle,
} from "lucide-react";
import {
  healthScoreApi,
  type HealthScoreResponse,
  type HealthScoreDimension,
} from "@/lib/api/health-score";
import {
  round,
  getStatusColor,
  getProgressBg,
  DIMENSION_ICONS,
} from "@/lib/utils/health-score";

interface Step0HealthScoreProps {
  onNext: (brandName: string, healthScore: HealthScoreResponse | null) => void;
  initialBrandName?: string;
}

export function Step0HealthScore({
  onNext,
  initialBrandName = "",
}: Step0HealthScoreProps) {
  const [brandName, setBrandName] = useState(initialBrandName);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [result, setResult] = useState<HealthScoreResponse | null>(null);

  const handleCheck = async () => {
    const trimmed = brandName.trim();
    if (!trimmed || trimmed.length < 2) {
      setError("请输入至少2个字符的品牌名称");
      return;
    }

    setLoading(true);
    setError(null);

    try {
      const data = await healthScoreApi.getHealthScore(trimmed);
      setResult(data);
    } catch (err) {
      setError(err instanceof Error ? err.message : "检测失败，请重试");
    } finally {
      setLoading(false);
    }
  };

  const handleNext = () => {
    onNext(brandName.trim(), result);
  };

  return (
    <div className="flex flex-col items-center justify-center py-8">
      <div className="mb-8 text-center">
        <div className="mb-4 inline-flex h-16 w-16 items-center justify-center rounded-full bg-primary/10">
          <Sparkles className="h-8 w-8 text-primary" />
        </div>
        <h2 className="mb-2 text-2xl font-bold">免费检测您的GEO健康分</h2>
        <p className="text-muted-foreground">
          输入品牌名称，即刻查看您的品牌在AI搜索中的表现
        </p>
      </div>

      <Card className="w-full max-w-md">
        <CardContent className="pt-6">
          <div className="space-y-4">
            <div className="flex gap-2">
              <Input
                value={brandName}
                onChange={(e) => {
                  setBrandName(e.target.value);
                  setError(null);
                }}
                placeholder="输入品牌名称，例如：华为"
                className="h-12 text-base"
                maxLength={50}
                autoFocus
                onKeyDown={(e) => {
                  if (e.key === "Enter" && !loading) {
                    handleCheck();
                  }
                }}
              />
              <Button
                onClick={handleCheck}
                disabled={loading || !brandName.trim()}
                size="lg"
                className="h-12 px-6"
              >
                {loading ? (
                  <Loader2 className="h-5 w-5 animate-spin" />
                ) : (
                  <>
                    检测
                    <ArrowRight className="ml-1 h-4 w-4" />
                  </>
                )}
              </Button>
            </div>

            {error && (
              <div className="flex items-center gap-2 rounded-lg bg-destructive/10 p-3 text-destructive text-sm">
                <AlertTriangle className="h-4 w-4 shrink-0" />
                {error}
              </div>
            )}
          </div>
        </CardContent>
      </Card>

      {result && (
        <div className="mt-6 w-full max-w-lg space-y-4">
          <Card className="border-2 border-primary/20">
            <CardContent className="pt-6">
              <div className="flex flex-col items-center">
                <div className="relative mb-3">
                  <span className="text-6xl font-bold">
                    {result.overall_score}
                  </span>
                  <span className="absolute top-1 text-xl text-muted-foreground">
                    /100
                  </span>
                </div>
                <Badge
                  variant="secondary"
                  className="text-base px-4 py-1 mb-2"
                >
                  {result.health_level_label}
                </Badge>
                <p className="text-sm text-muted-foreground">
                  {result.brand_name} 的GEO健康分
                </p>
              </div>
            </CardContent>
          </Card>

          <Card>
            <CardContent className="pt-6 space-y-4">
              <h3 className="font-semibold text-base">核心维度评分</h3>
              {result.dimensions.map((dim: HealthScoreDimension) => {
                const Icon = DIMENSION_ICONS[dim.name] || Activity;
                return (
                  <div key={dim.name} className="space-y-2">
                    <div className="flex items-center justify-between">
                      <div className="flex items-center gap-2">
                        <Icon className="h-4 w-4 text-muted-foreground" />
                        <span className="text-sm font-medium">{dim.name}</span>
                      </div>
                      <span className={`text-sm font-semibold ${getStatusColor(dim.percentage)}`}>
                        {round(dim.percentage, 1)}%
                      </span>
                    </div>
                    <div className="h-2 w-full overflow-hidden rounded-full bg-gray-100">
                      <div
                        className={`h-full rounded-full transition-all ${getProgressBg(dim.percentage)}`}
                        style={{ width: `${Math.max(dim.percentage, 2)}%` }}
                      />
                    </div>
                  </div>
                );
              })}

              {result.recommendations.length > 0 && (
                <div className="border-t pt-4 space-y-2">
                  <h4 className="text-sm font-semibold">关键问题</h4>
                  {result.recommendations.slice(0, 3).map((rec, i) => (
                    <div
                      key={i}
                      className="flex items-start gap-2 text-sm text-muted-foreground"
                    >
                      <span className="mt-0.5 h-1.5 w-1.5 shrink-0 rounded-full bg-amber-500" />
                      <span>{rec.title}</span>
                    </div>
                  ))}
                </div>
              )}

              <div className="border-t pt-4">
                <p className="text-xs text-muted-foreground text-center">
                  免费版仅展示3个核心维度 · 升级Pro解锁完整6维度诊断
                </p>
              </div>
            </CardContent>
          </Card>

          <Button onClick={handleNext} size="lg" className="w-full">
            注册查看完整报告
            <ArrowRight className="ml-2 h-4 w-4" />
          </Button>

          <p className="text-xs text-center text-muted-foreground">
            免费注册即可保存品牌并获取持续监控
          </p>
        </div>
      )}

      {!result && !loading && (
        <div className="mt-8 flex items-center gap-2 text-sm text-muted-foreground">
          <div className="h-2 w-2 rounded-full bg-primary" />
          <span>无需注册，即刻查看您的GEO健康分</span>
        </div>
      )}
    </div>
  );
}
