import { Ionicons } from '@expo/vector-icons';
import { useLocalSearchParams, useRouter } from 'expo-router';
import { useState } from 'react';
import {
  ActivityIndicator,
  Alert,
  Pressable,
  ScrollView,
  StyleSheet,
  Text,
  TextInput,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import Svg, { Circle, Line, Polygon, Text as SvgText } from 'react-native-svg';
import { useJobDetail } from '../../src/hooks';
import { buildJobShareText } from '../../src/api';
import { shareText } from '../../src/lib/shareFile';
import {colors, spacing} from '../../src/theme';
import { formatThousands } from '../../src/utils';
import type { JobDimensionScore } from '../../src/types';

/* ===================== 雷达图（6 维度，SVG 绘制） ===================== */

/** 六边形雷达图：同心网格 + 轴线 + 数据多边形 + 维度标签 */
function RadarChart({
  dimensions,
  size = 160,
}: {
  dimensions: JobDimensionScore[];
  size?: number;
}) {
  const cx = size / 2;
  const cy = size / 2;
  const count = dimensions.length;
  // 数据/网格最大半径（预留标签空间）
  const R = size / 2 - 36;
  const labelR = R + 16;
  const levels = [0.25, 0.5, 0.75, 1];
  const angleFor = (i: number) => (-90 + i * (360 / count)) * (Math.PI / 180);
  const pointFor = (i: number, ratio: number) => ({
    x: cx + R * ratio * Math.cos(angleFor(i)),
    y: cy + R * ratio * Math.sin(angleFor(i)),
  });
  const polygonPoints = (ratio: number) =>
    dimensions
      .map((_, i) => {
        const p = pointFor(i, ratio);
        return `${p.x},${p.y}`;
      })
      .join(' ');

  const dataPoints = dimensions.map((d, i) => pointFor(i, d.value / 100));

  return (
    <Svg width={size} height={size}>
      {/* 同心网格 */}
      {levels.map((ratio) => (
        <Polygon
          key={ratio}
          points={polygonPoints(ratio)}
          fill="none"
          stroke={colors.border}
          strokeWidth={1}
        />
      ))}
      {/* 轴线 */}
      {dimensions.map((_, i) => {
        const p = pointFor(i, 1);
        return (
          <Line key={i} x1={cx} y1={cy} x2={p.x} y2={p.y} stroke={colors.border} strokeWidth={1} />
        );
      })}
      {/* 数据多边形 */}
      <Polygon
        points={dataPoints.map((p) => `${p.x},${p.y}`).join(' ')}
        fill={colors.primary}
        fillOpacity={0.15}
        stroke={colors.primary}
        strokeWidth={2}
      />
      {/* 数据点 */}
      {dataPoints.map((p, i) => (
        <Circle key={i} cx={p.x} cy={p.y} r={3} fill={colors.primary} />
      ))}
      {/* 维度标签 */}
      {dimensions.map((d, i) => {
        const lx = cx + labelR * Math.cos(angleFor(i));
        const ly = cy + labelR * Math.sin(angleFor(i));
        return (
          <SvgText
            key={d.id}
            x={lx}
            y={ly}
            fontSize={10}
            fill={colors.textSecondary}
            textAnchor="middle"
            alignmentBaseline="middle"
          >
            {d.name}
          </SvgText>
        );
      })}
    </Svg>
  );
}

/* ===================== 子组件 ===================== */

/** 顶部导航：返回 + 标题 + 分享（onShare 缺省时不渲染分享按钮，避免留下点了没反应的入口） */
function Header({ onBack, onShare }: { onBack: () => void; onShare?: () => void }) {
  return (
    <View style={styles.header}>
      <Pressable style={styles.headerBtn} onPress={onBack} hitSlop={8}>
        <Ionicons name="chevron-back" size={24} color={colors.textPrimary} />
      </Pressable>
      <Text style={styles.headerTitle}>岗位详情</Text>
      {onShare ? (
        <Pressable style={styles.headerBtnRight} onPress={onShare} hitSlop={8}>
          <Ionicons name="share-social-outline" size={22} color={colors.textPrimary} />
        </Pressable>
      ) : (
        <View style={styles.headerBtnRight} />
      )}
    </View>
  );
}

/** 分区标题：竖条装饰 + 标题 + 可选右侧链接 */
function SectionTitle({
  title,
  link,
  onLink,
}: {
  title: string;
  link?: string;
  onLink?: () => void;
}) {
  return (
    <View style={styles.sectionHeader}>
      <View style={styles.sectionBar} />
      <Text style={styles.sectionTitle}>{title}</Text>
      {link ? (
        <Pressable style={styles.sectionLinkBtn} onPress={onLink} hitSlop={8}>
          <Text style={styles.sectionLink}>{link} &gt;</Text>
        </Pressable>
      ) : null}
    </View>
  );
}

/* ===================== 页面 ===================== */

export default function JobDetailScreen() {
  const { id } = useLocalSearchParams<{ id: string }>();
  const router = useRouter();
  const { detail, overallScore, salaryData, reviews, loading, error, refresh, publishReview } =
    useJobDetail(id);
  const [comment, setComment] = useState('');
  const [publishing, setPublishing] = useState(false);

  /**
   * 分享岗位：把当前岗位拼成文本经系统分享面板发出。
   * `ok` 只代表面板已拉起，不能据此提示「分享成功」，只在失败时说明原因（见 lib/shareFile）。
   */
  const handleShare = async () => {
    if (!detail) return;
    const outcome = await shareText(
      buildJobShareText(detail, overallScore, salaryData, reviews.length),
      `${detail.positionName}｜${detail.companyName}`,
    );
    if (!outcome.ok) Alert.alert('无法分享', outcome.message);
  };

  // 发布评价：空内容拦截，成功后清空输入框（列表由 hook 自动刷新）
  const handlePublish = async () => {
    const text = comment.trim();
    if (!text) {
      Alert.alert('提示', '请先输入你的评价内容');
      return;
    }
    setPublishing(true);
    try {
      await publishReview(text);
      setComment('');
    } catch (e) {
      Alert.alert('发布失败', (e as Error).message || '请稍后重试');
    } finally {
      setPublishing(false);
    }
  };

  // 错误态
  if (error) {
    return (
      <SafeAreaView style={styles.safeArea} edges={['top', 'bottom']}>
        <Header onBack={() => router.back()} />
        <View style={styles.stateWrap}>
          <Text style={styles.stateText}>加载失败，请重试</Text>
          <Pressable style={styles.retryBtn} onPress={refresh}>
            <Text style={styles.retryText}>重试</Text>
          </Pressable>
        </View>
      </SafeAreaView>
    );
  }

  // 加载态
  if (loading || !detail || !overallScore || !salaryData) {
    return (
      <SafeAreaView style={styles.safeArea} edges={['top', 'bottom']}>
        <Header onBack={() => router.back()} />
        <View style={styles.stateWrap}>
          <ActivityIndicator size="large" color={colors.primary} />
        </View>
      </SafeAreaView>
    );
  }

  return (
    <SafeAreaView style={styles.safeArea} edges={['top', 'bottom']}>
      <Header onBack={() => router.back()} onShare={handleShare} />

      <ScrollView
        style={styles.scroll}
        contentContainerStyle={styles.content}
        showsVerticalScrollIndicator={false}
      >
        {/* 1. 岗位基本信息 */}
        <View style={styles.card}>
          <View style={styles.basicTop}>
            <Text style={styles.positionName}>{detail.positionName}</Text>
            <View style={styles.statusCol}>
              <View style={styles.statusTag}>
                <Text style={styles.statusText}>{detail.status}</Text>
              </View>
              <Text style={styles.viewsText}>浏览{formatThousands(detail.views)}</Text>
            </View>
          </View>
          <Text style={styles.salary}>
            {detail.salaryMin}-{detail.salaryMax}K · {detail.salaryMonths}薪
          </Text>
          <Text style={styles.metaText}>
            {detail.companyName} · {detail.industry} · {detail.companySize}
          </Text>
          <Text style={styles.metaText}>
            {detail.companyLocation} · {detail.experience} · {detail.education}
          </Text>
          <View style={styles.benefits}>
            {detail.benefits.map((item) => (
              <View key={item} style={styles.benefitTag}>
                <Text style={styles.benefitText}>{item}</Text>
              </View>
            ))}
          </View>
        </View>

        {/* 2. 岗位综合评分 */}
        {/* 「评分说明」入口已摘除：项目没有评分规则说明页 */}
        <SectionTitle title="岗位综合评分" />
        <View style={styles.card}>
          <View style={styles.scoreRow}>
            <RadarChart dimensions={overallScore.dimensions} />
            <View style={styles.scoreInfo}>
              <View style={styles.scoreNumberRow}>
                <Text style={styles.scoreNumber}>{overallScore.totalScore}</Text>
                <Text style={styles.scoreUnit}>分</Text>
              </View>
              <View style={styles.levelTag}>
                <Text style={styles.levelTagText}>{overallScore.level}</Text>
              </View>
              <Text style={styles.scoreRank}>{overallScore.rank}</Text>
            </View>
          </View>
          <Pressable style={styles.compareBtn} onPress={() => router.push('/jobs/compare')} hitSlop={6}>
            <Ionicons name="add-circle-outline" size={16} color={colors.primary} />
            <Text style={styles.compareText}>加入对比</Text>
          </Pressable>
        </View>

        {/* 3. 真实薪资区间 */}
        {/* 「全部」入口已摘除：下面这张卡已经把 4 档经验区间列全了，点进去没有更多内容 */}
        <SectionTitle title="真实薪资区间" />
        <View style={styles.card}>
          {salaryData.ranges.map((range, index) => (
            <View
              key={range.experience}
              style={[styles.salaryRow, index === salaryData.ranges.length - 1 && styles.salaryRowLast]}
            >
              <Text style={styles.salaryExp}>{range.experience}</Text>
              <Text style={styles.salaryRange}>
                {range.min}-{range.max}K
              </Text>
            </View>
          ))}
          <Text style={styles.salarySource}>{salaryData.dataSource}</Text>
        </View>

        {/* 4. 员工评价 */}
        <SectionTitle title="员工评价" />
        {reviews.length === 0 && (
          /* 标题是常驻的，没有这一块时下方会是一片空白，看上去像加载坏了 */
          <View style={styles.emptyCard}>
            <Ionicons name="chatbubble-outline" size={32} color={colors.textHint} />
            <Text style={styles.emptyText}>暂无员工评价</Text>
            <Text style={styles.emptyHint}>成为第一个分享这家公司真实情况的人</Text>
          </View>
        )}
        {reviews.map((review) => (
          <View key={review.id} style={styles.card}>
            <View style={styles.reviewHeader}>
              <Text style={styles.reviewName}>{review.userName}</Text>
              <Text style={styles.reviewRole}>{review.userRole}</Text>
              <Text style={styles.reviewTime}>{review.time}</Text>
            </View>
            <Text style={styles.reviewContent}>{review.content}</Text>
            <View style={styles.reviewTags}>
              {review.tags.map((tag) => (
                <View key={tag} style={styles.reviewTag}>
                  <Text style={styles.reviewTagText}>{tag}</Text>
                </View>
              ))}
            </View>
          </View>
        ))}
      </ScrollView>

      {/* 5. 评论输入框（固定底部） */}
      <View style={styles.commentBar}>
        <TextInput
          style={styles.commentInput}
          placeholder="说说你对这个岗位的看法..."
          placeholderTextColor={colors.textHint}
          value={comment}
          onChangeText={setComment}
        />
        <Pressable
          style={[styles.publishBtn, publishing && styles.publishBtnDisabled]}
          onPress={handlePublish}
          disabled={publishing}
        >
          {publishing ? (
            <ActivityIndicator size="small" color={colors.white} />
          ) : (
            <Text style={styles.publishText}>发布</Text>
          )}
        </Pressable>
      </View>
    </SafeAreaView>
  );
}


const styles = StyleSheet.create({
  safeArea: {
    flex: 1,
    backgroundColor: colors.pageBg,
  },
  stateWrap: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
  stateText: {
    marginTop: 12,
    fontSize: 14,
    color: colors.textSecondary,
  },
  retryBtn: {
    marginTop: 16,
    paddingHorizontal: 24,
    paddingVertical: 8,
    borderRadius: 18,
    backgroundColor: colors.primaryBtn,
  },
  retryText: {
    fontSize: 13,
    fontWeight: '600',
    color: colors.white,
  },
  /* ---- 顶部导航 ---- */
  header: {
    height: 48,
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
  },
  headerTitle: {
    fontSize: 17,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  /**
   * 头部按钮：返回靠左、分享靠右。
   * 原先两者共用一条**只写了 `top`、没写 `left`/`right`** 的 absolute 样式，
   * 在 `justifyContent: 'center'` 的父容器里落到同一处彼此重叠 —— 返回键与分享键
   * 都不在用户预期位置（分享键实测点不到）。absolute 必须成对写清水平锚点。
   */
  headerBtn: {
    position: 'absolute',
    top: 0,
    left: 0,
    width: 48,
    height: 48,
    alignItems: 'center',
    justifyContent: 'center',
  },
  headerBtnRight: {
    position: 'absolute',
    top: 0,
    right: 0,
    width: 48,
    height: 48,
    alignItems: 'center',
    justifyContent: 'center',
  },
  scroll: {
    flex: 1,
  },
  content: {
    paddingHorizontal: 8,
    paddingBottom: 24,
  },
  card: {
    backgroundColor: colors.white,
    borderRadius: 8,
    padding: 8,
    marginBottom: 8,
  },
  /* ---- 空态 ---- */
  emptyCard: {
    backgroundColor: colors.white,
    borderRadius: 8,
    paddingVertical: 8,
    paddingHorizontal: 8,
    marginBottom: 8,
    alignItems: 'center',
    gap: 8,
  },
  emptyText: {
    fontSize: 14,
    fontWeight: '600',
    color: colors.textSecondary,
  },
  emptyHint: {
    fontSize: 12,
    color: colors.textHint,
    textAlign: 'center',
  },
  /* ---- 基本信息 ---- */
  basicTop: {
    flexDirection: 'row',
    alignItems: 'flex-start',
    justifyContent: 'space-between',
  },
  positionName: {
    flex: 1,
    fontSize: 22,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  statusCol: {
    alignItems: 'flex-end',
    marginLeft: 12,
  },
  statusTag: {
    backgroundColor: colors.successLight,
    paddingHorizontal: 8,
    paddingVertical: 3,
    borderRadius: 10,
  },
  statusText: {
    fontSize: 12,
    fontWeight: '600',
    color: colors.successText,
  },
  viewsText: {
    marginTop: 6,
    fontSize: 12,
    color: colors.textHint,
  },
  salary: {
    marginTop: 14,
    fontSize: 20,
    fontWeight: '700',
    color: colors.primary,
  },
  metaText: {
    marginTop: 8,
    fontSize: 13,
    color: colors.textSecondary,
  },
  benefits: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    marginTop: 12,
  },
  benefitTag: {
    backgroundColor: colors.primaryLight,
    borderWidth: 1,
    borderColor: colors.primaryBorder,
    borderRadius: 12,
    paddingHorizontal: 10,
    paddingVertical: 4,
    marginRight: 8,
    marginBottom: 8,
  },
  benefitText: {
    fontSize: 12,
    color: colors.primary,
  },
  /* ---- 分区标题 ---- */
  sectionHeader: {
    flexDirection: 'row',
    alignItems: 'center',
    marginBottom: 12,
  },
  sectionBar: {
    width: 4,
    height: 16,
    borderRadius: 2,
    backgroundColor: colors.primary,
    marginRight: 8,
  },
  sectionTitle: {
    flex: 1,
    fontSize: 17,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  sectionLinkBtn: {
    paddingLeft: 8,
  },
  sectionLink: {
    fontSize: 13,
    color: colors.primary,
  },
  /* ---- 综合评分 ---- */
  scoreRow: {
    flexDirection: 'row',
    alignItems: 'center',
  },
  scoreInfo: {
    flex: 1,
    alignItems: 'flex-start',
    marginLeft: 8,
  },
  scoreNumberRow: {
    flexDirection: 'row',
    alignItems: 'baseline',
  },
  scoreNumber: {
    fontSize: 40,
    fontWeight: '700',
    color: colors.primary,
  },
  scoreUnit: {
    fontSize: 14,
    fontWeight: '600',
    color: colors.primary,
  },
  levelTag: {
    marginTop: 4,
    backgroundColor: colors.successLight,
    paddingHorizontal: 10,
    paddingVertical: 4,
    borderRadius: 12,
  },
  levelTagText: {
    fontSize: 13,
    fontWeight: '600',
    color: colors.successText,
  },
  scoreRank: {
    marginTop: 8,
    fontSize: 12,
    color: colors.textSecondary,
  },
  compareBtn: {
    flexDirection: 'row',
    alignItems: 'center',
    alignSelf: 'flex-start',
    marginTop: 16,
  },
  compareText: {
    marginLeft: 4,
    fontSize: 14,
    fontWeight: '600',
    color: colors.primary,
  },
  /* ---- 薪资区间 ---- */
  salaryRow: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingVertical: 12,
    borderBottomWidth: 1,
    borderBottomColor: colors.borderLight,
  },
  salaryRowLast: {
    borderBottomWidth: 0,
  },
  salaryExp: {
    fontSize: 14,
    color: colors.textSecondary,
  },
  salaryRange: {
    fontSize: 15,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  salarySource: {
    marginTop: 12,
    fontSize: 12,
    color: colors.textHint,
  },
  /* ---- 员工评价 ---- */
  reviewHeader: {
    flexDirection: 'row',
    alignItems: 'center',
  },
  reviewName: {
    fontSize: 14,
    fontWeight: '700',
    color: colors.textPrimary,
  },
  reviewRole: {
    marginLeft: 8,
    fontSize: 12,
    color: colors.textSecondary,
  },
  reviewTime: {
    flex: 1,
    textAlign: 'right',
    fontSize: 12,
    color: colors.textHint,
  },
  reviewContent: {
    marginTop: 10,
    fontSize: 13,
    lineHeight: 20,
    color: colors.textPrimary,
  },
  reviewTags: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    marginTop: 10,
  },
  reviewTag: {
    backgroundColor: colors.pageBg,
    borderWidth: 1,
    borderColor: colors.border,
    borderRadius: 12,
    paddingHorizontal: 10,
    paddingVertical: 4,
    marginRight: 8,
    marginBottom: 8,
  },
  reviewTagText: {
    fontSize: 12,
    color: colors.textSecondary,
  },
  /* ---- 评论输入框 ---- */
  commentBar: {
    flexDirection: 'row',
    alignItems: 'center',
    paddingHorizontal: spacing.framework,
    paddingVertical: 10,
    backgroundColor: colors.white,
    borderTopWidth: 1,
    borderTopColor: colors.borderLight,
  },
  commentInput: {
    flex: 1,
    height: 40,
    borderRadius: 20,
    backgroundColor: colors.pageBg,
    paddingHorizontal: spacing.framework,
    fontSize: 14,
    color: colors.textPrimary,
  },
  publishBtn: {
    marginLeft: 12,
    paddingHorizontal: 18,
    height: 40,
    borderRadius: 20,
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: colors.primaryBtn,
  },
  publishBtnDisabled: {
    opacity: 0.6,
  },
  publishText: {
    fontSize: 14,
    fontWeight: '600',
    color: colors.white,
  },
});