import { Ionicons } from '@expo/vector-icons';
import { useRouter } from 'expo-router';
import {
  Alert,
  Pressable,
  ScrollView,
  StyleSheet,
  Text,
  TextInput,
  View,
} from 'react-native';
import { SafeAreaView } from 'react-native-safe-area-context';
import Svg, { Line, Polygon, Text as SvgText } from 'react-native-svg';
import { useInterviewScore } from '../src/hooks';
import { LoadingState, ErrorState } from '../src/components/StateView';
import {colors, semanticColorTokens, spacing} from '../src/theme';
import { formatDateTime } from '../src/utils';
import type { HireSuggestion, InterviewScoreData, InterviewScoreDimension, InterviewScoreTag } from '../src/types';

/* ===================== 子组件：顶部导航 ===================== */

function Header({ onBack }: { onBack: () => 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}>面试评分</Text>
      {/* 原先这里是「历史评分」入口：没有历史评分页，先摘掉，加页面时再挂回来 */}
      <View style={styles.headerBtn} />
    </View>
  );
}

/* ===================== 子组件：面试信息卡 ===================== */

function InterviewInfoCard({ data }: { data: InterviewScoreData }) {
  return (
    <View style={styles.infoCard}>
      <View style={styles.infoRow}>
        <View style={styles.infoItem}>
          <Text style={styles.infoLabel}>候选人</Text>
          <Text style={styles.infoValue}>{data.candidateName}</Text>
        </View>
        <View style={styles.infoItem}>
          <Text style={styles.infoLabel}>面试岗位</Text>
          <Text style={styles.infoValue}>{data.positionName}</Text>
        </View>
      </View>
      <View style={styles.infoRow}>
        <View style={styles.infoItem}>
          <Text style={styles.infoLabel}>面试时间</Text>
          <Text style={styles.infoValue}>{data.interviewTime}</Text>
        </View>
      </View>
    </View>
  );
}

/* ===================== 子组件：综合评分卡 ===================== */

function OverallScoreCard({ score }: { score: number }) {
  return (
    <View style={styles.scoreCard}>
      <View>
        <Text style={styles.scoreLabel}>综合评分</Text>
        <Text style={styles.scoreValue}>{score}</Text>
      </View>
      <View style={styles.scoreIcon}>
        <Ionicons name="ribbon-outline" size={40} color={colors.white} />
      </View>
    </View>
  );
}

/* ===================== 子组件：雷达图 ===================== */

function RadarChart({ dimensions }: { dimensions: InterviewScoreDimension[] }) {
  const size = 220;
  const center = size / 2;
  const radius = 80;
  const angleStep = (Math.PI * 2) / dimensions.length;

  const axisPoints = dimensions.map((_, i) => {
    const angle = i * angleStep - Math.PI / 2;
    return {
      x: center + radius * Math.cos(angle),
      y: center + radius * Math.sin(angle),
      label: dimensions[i].name,
    };
  });

  const dataPoints = dimensions.map((d, i) => {
    const angle = i * angleStep - Math.PI / 2;
    const r = (d.score / d.maxScore) * radius;
    return {
      x: center + r * Math.cos(angle),
      y: center + r * Math.sin(angle),
    };
  });

  const polygonPoints = dataPoints.map((p) => `${p.x},${p.y}`).join(' ');

  return (
    <View style={styles.card}>
      <Text style={styles.cardTitle}>八维能力评分</Text>
      <View style={styles.radarWrap}>
        <Svg width={size} height={size}>
          {[0.2, 0.4, 0.6, 0.8, 1].map((scale) => (
            <Polygon
              key={scale}
              points={axisPoints.map((a) => {
                const px = center + (a.x - center) * scale;
                const py = center + (a.y - center) * scale;
                return `${px},${py}`;
              }).join(' ')}
              fill="none"
              stroke={colors.borderLight}
              strokeWidth={1}
            />
          ))}
          {axisPoints.map((a, i) => (
            <Line key={i} x1={center} y1={center} x2={a.x} y2={a.y} stroke={colors.borderLight} strokeWidth={1} />
          ))}
          <Polygon points={polygonPoints} fill={colors.primary + '25'} stroke={colors.primary} strokeWidth={2} />
          {axisPoints.map((a, i) => {
            const labelX = center + (a.x - center) * 1.18;
            const labelY = center + (a.y - center) * 1.18;
            return (
              <SvgText key={i} x={labelX} y={labelY} fill={colors.textSecondary} fontSize={10} textAnchor="middle" alignmentBaseline="middle">
                {a.label}
              </SvgText>
            );
          })}
        </Svg>
      </View>
      <View style={styles.dimensionList}>
        {dimensions.map((d) => (
          <View key={d.id} style={styles.dimensionItem}>
            <Text style={styles.dimensionName}>{d.name}</Text>
            <View style={styles.dimensionTrack}>
              <View style={[styles.dimensionFill, { width: `${d.score}%` }]} />
            </View>
            <Text style={styles.dimensionScore}>{d.score}</Text>
          </View>
        ))}
      </View>
    </View>
  );
}

/* ===================== 子组件：评价标签 ===================== */

function TagGroup({ tags, onToggle }: { tags: InterviewScoreTag[]; onToggle: (id: string) => void }) {
  return (
    <View style={styles.card}>
      <Text style={styles.cardTitle}>面试评价标签</Text>
      <View style={styles.tagRow}>
        {tags.map((tag) => {
          const color = semanticColorTokens[tag.color] ?? colors.primary;
          return (
            <Pressable
              key={tag.id}
              style={[styles.tag, tag.selected && { backgroundColor: color, borderColor: color }]}
              onPress={() => onToggle(tag.id)}
            >
              {tag.selected && <Ionicons name="checkmark" size={12} color={colors.white} />}
              <Text style={[styles.tagText, tag.selected && styles.tagTextActive]}>{tag.label}</Text>
            </Pressable>
          );
        })}
      </View>
    </View>
  );
}

/* ===================== 子组件：文字评价 ===================== */

function CommentInput({ value, onChangeText }: { value: string; onChangeText: (text: string) => void }) {
  return (
    <View style={styles.card}>
      <Text style={styles.cardTitle}>文字评价</Text>
      <TextInput
        style={styles.textarea}
        value={value}
        onChangeText={onChangeText}
        placeholder="请输入对候选人的综合评价..."
        placeholderTextColor={colors.textHint}
        multiline
        textAlignVertical="top"
        maxLength={500}
      />
      <Text style={styles.charCount}>{value.length}/500</Text>
    </View>
  );
}

/* ===================== 子组件：录用建议 ===================== */

function HireSuggestionGroup({
  suggestions,
  onSelect,
}: {
  suggestions: HireSuggestion[];
  onSelect: (type: HireSuggestion['type']) => void;
}) {
  const typeColor: Record<string, string> = {
    strong: colors.success,
    consider: colors.compareOrange,
    reject: colors.danger,
  };
  return (
    <View style={styles.card}>
      <Text style={styles.cardTitle}>录用建议</Text>
      {suggestions.map((s) => (
        <Pressable
          key={s.type}
          style={[
            styles.suggestionRow,
            s.selected && { backgroundColor: typeColor[s.type] + '10', borderColor: typeColor[s.type] },
          ]}
          onPress={() => onSelect(s.type)}
        >
          <View style={[styles.suggestionDot, { backgroundColor: typeColor[s.type] }]} />
          <View style={styles.suggestionBody}>
            <Text style={styles.suggestionTitle}>{s.title}</Text>
            <Text style={styles.suggestionDesc}>{s.desc}</Text>
          </View>
          {s.selected && <Ionicons name="checkmark-circle" size={20} color={typeColor[s.type]} />}
        </Pressable>
      ))}
    </View>
  );
}

/* ===================== 子组件：薪资建议 ===================== */

function SalarySuggestionCard({ salary }: { salary: InterviewScoreData['salarySuggestion'] }) {
  return (
    <View style={styles.card}>
      <Text style={styles.cardTitle}>薪资建议（选填）</Text>
      <View style={styles.salaryBox}>
        <View>
          <Text style={styles.salaryRange}>{salary.range}</Text>
          <Text style={styles.salaryLevel}>{salary.level}</Text>
        </View>
        <Ionicons name="cash-outline" size={32} color={colors.info} />
      </View>
      <Text style={styles.salaryNote}>{salary.note}</Text>
    </View>
  );
}

/* ===================== 页面主组件 ===================== */

export default function InterviewScoreScreen() {
  const router = useRouter();
  const {
    score,
    loading,
    error,
    toggleTag,
    updateComment,
    selectHireSuggestion,
    submit,
    submitting,
    saveDraft,
    savingDraft,
    restoreDraft,
    discardDraft,
    hasPendingDraft,
    draftSavedAt,
    refresh,
  } = useInterviewScore('interview-1');

  /** 保存草稿：成功后就地在按钮旁显示保存时间，失败给出提示 */
  const handleSaveDraft = async () => {
    try {
      const savedAt = await saveDraft();
      if (savedAt) {
        Alert.alert('已保存草稿', `保存时间 ${formatDateTime(savedAt)}，下次进入这场面试时可恢复。`);
      }
    } catch {
      Alert.alert('保存失败', '草稿没能存到本机，请稍后重试。');
    }
  };

  if (loading) {
    return (
      <SafeAreaView style={styles.loadingContainer} edges={['top']}>
        <LoadingState text="加载中…" />
      </SafeAreaView>
    );
  }

  if (error || !score) {
    return (
      <SafeAreaView style={styles.loadingContainer} edges={['top']}>
        <ErrorState onRetry={refresh} />
      </SafeAreaView>
    );
  }

  return (
    <View style={styles.container}>
      <SafeAreaView edges={['top']}>
        <Header onBack={() => router.back()} />
      </SafeAreaView>
      <ScrollView style={styles.scroll} contentContainerStyle={styles.scrollContent}>
        {hasPendingDraft && (
          <View style={styles.draftBanner}>
            <Ionicons name="time-outline" size={18} color={colors.infoText} />
            <View style={styles.draftBannerBody}>
              <Text style={styles.draftBannerTitle}>
                发现未提交的草稿{draftSavedAt ? `（${formatDateTime(draftSavedAt)} 保存）` : ''}
              </Text>
              <Text style={styles.draftBannerDesc}>恢复后会覆盖当前页面上的评分内容</Text>
            </View>
            <Pressable style={styles.draftBannerBtn} onPress={restoreDraft} hitSlop={6}>
              <Text style={styles.draftBannerBtnText}>恢复</Text>
            </Pressable>
            <Pressable onPress={() => void discardDraft()} hitSlop={6}>
              <Text style={styles.draftBannerDiscard}>放弃</Text>
            </Pressable>
          </View>
        )}

        <InterviewInfoCard data={score} />
        <OverallScoreCard score={score.overallScore} />
        <RadarChart dimensions={score.dimensions} />
        <TagGroup tags={score.tags} onToggle={toggleTag} />
        <CommentInput value={score.comment} onChangeText={updateComment} />
        <HireSuggestionGroup suggestions={score.hireSuggestions} onSelect={selectHireSuggestion} />
        <SalarySuggestionCard salary={score.salarySuggestion} />
      </ScrollView>
      <View style={styles.footer}>
        <Pressable
          style={[styles.draftBtn, savingDraft && styles.draftBtnDisabled]}
          onPress={handleSaveDraft}
          disabled={savingDraft}
        >
          <Text style={styles.draftText}>{savingDraft ? '保存中…' : '保存草稿'}</Text>
        </Pressable>
        <Pressable
          style={[styles.submitBtn, submitting && styles.submitBtnDisabled]}
          onPress={submit}
          disabled={submitting}
        >
          <Text style={styles.submitText}>{submitting ? '提交中...' : '提交评分'}</Text>
        </Pressable>
      </View>
    </View>
  );
}

/* ===================== 样式 ===================== */

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: colors.pageBg,
  },
  loadingContainer: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: colors.pageBg,
  },
  header: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: spacing.framework,
    paddingVertical: 12,
    backgroundColor: colors.white,
    borderBottomWidth: 1,
    borderBottomColor: colors.borderLight,
  },
  headerBtn: {
    width: 36,
    height: 36,
    justifyContent: 'center',
    alignItems: 'center',
  },
  headerTitle: {
    fontSize: 17,
    fontWeight: '600',
    color: colors.textPrimary,
  },
  scroll: {
    flex: 1,
  },
  scrollContent: {
    padding: spacing.card,
    paddingBottom: 100,
  },
  infoCard: {
    backgroundColor: colors.white,
    borderRadius: spacing.card,
    padding: spacing.card,
    marginBottom: 8,
  },
  infoRow: {
    flexDirection: 'row',
    marginBottom: 12,
  },
  infoItem: {
    flex: 1,
  },
  infoLabel: {
    fontSize: 12,
    color: colors.textHint,
    marginBottom: 4,
  },
  infoValue: {
    fontSize: 15,
    fontWeight: '600',
    color: colors.textPrimary,
  },
  scoreCard: {
    backgroundColor: colors.primary,
    borderRadius: spacing.card,
    padding: spacing.card,
    marginBottom: 8,
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
  },
  scoreLabel: {
    fontSize: 14,
    color: colors.white,
    opacity: 0.9,
  },
  scoreValue: {
    fontSize: 42,
    fontWeight: '700',
    color: colors.white,
    marginTop: 4,
  },
  scoreIcon: {
    width: 64,
    height: 64,
    borderRadius: 32,
    backgroundColor: colors.onBrandSurface,
    justifyContent: 'center',
    alignItems: 'center',
  },
  card: {
    backgroundColor: colors.white,
    borderRadius: spacing.card,
    padding: spacing.card,
    marginBottom: 8,
  },
  cardTitle: {
    fontSize: 16,
    fontWeight: '700',
    color: colors.textPrimary,
    marginBottom: 12,
  },
  radarWrap: {
    alignItems: 'center',
  },
  dimensionList: {
    marginTop: 16,
  },
  dimensionItem: {
    flexDirection: 'row',
    alignItems: 'center',
    marginBottom: 10,
  },
  dimensionName: {
    width: 70,
    fontSize: 13,
    color: colors.textSecondary,
  },
  dimensionTrack: {
    flex: 1,
    height: 8,
    borderRadius: 4,
    backgroundColor: colors.borderLight,
    marginHorizontal: 10,
  },
  dimensionFill: {
    height: 8,
    borderRadius: 4,
    backgroundColor: colors.primary,
  },
  dimensionScore: {
    width: 28,
    fontSize: 13,
    fontWeight: '600',
    color: colors.textPrimary,
    textAlign: 'right',
  },
  tagRow: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    marginHorizontal: -4,
  },
  tag: {
    flexDirection: 'row',
    alignItems: 'center',
    paddingHorizontal: 12,
    paddingVertical: 7,
    borderRadius: 18,
    borderWidth: 1,
    borderColor: colors.border,
    margin: 4,
    backgroundColor: colors.white,
  },
  tagText: {
    fontSize: 13,
    color: colors.textPrimary,
    marginLeft: 4,
  },
  tagTextActive: {
    color: colors.white,
    fontWeight: '500',
  },
  textarea: {
    height: 120,
    borderWidth: 1,
    borderColor: colors.border,
    borderRadius: 12,
    padding: 12,
    fontSize: 14,
    color: colors.textPrimary,
    backgroundColor: colors.pageBg,
  },
  charCount: {
    textAlign: 'right',
    fontSize: 12,
    color: colors.textHint,
    marginTop: 8,
  },
  suggestionRow: {
    flexDirection: 'row',
    alignItems: 'center',
    padding: spacing.card,
    borderRadius: spacing.card,
    borderWidth: 1,
    borderColor: colors.borderLight,
    marginBottom: 8,
  },
  suggestionDot: {
    width: 10,
    height: 10,
    borderRadius: 5,
    marginRight: 10,
  },
  suggestionBody: {
    flex: 1,
  },
  suggestionTitle: {
    fontSize: 14,
    fontWeight: '600',
    color: colors.textPrimary,
    marginBottom: 2,
  },
  suggestionDesc: {
    fontSize: 12,
    color: colors.textSecondary,
  },
  salaryBox: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    backgroundColor: colors.infoLight,
    borderRadius: spacing.card,
    padding: spacing.card,
  },
  salaryRange: {
    fontSize: 24,
    fontWeight: '700',
    color: colors.info,
  },
  salaryLevel: {
    fontSize: 14,
    color: colors.infoText,
    marginTop: 4,
  },
  salaryNote: {
    fontSize: 12,
    color: colors.textSecondary,
    marginTop: 10,
  },
  footer: {
    flexDirection: 'row',
    padding: spacing.framework,
    paddingBottom: 24,
    backgroundColor: colors.white,
    borderTopWidth: 1,
    borderTopColor: colors.borderLight,
  },
  draftBtn: {
    flex: 1,
    height: 46,
    borderRadius: 24,
    borderWidth: 1,
    borderColor: colors.border,
    justifyContent: 'center',
    alignItems: 'center',
    marginRight: 12,
  },
  draftText: {
    fontSize: 15,
    fontWeight: '600',
    color: colors.textPrimary,
  },
  draftBtnDisabled: { opacity: 0.6 },
  draftBanner: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 10,
    backgroundColor: colors.infoLight,
    borderWidth: 1,
    borderColor: colors.infoBorder,
    borderRadius: spacing.card,
    paddingHorizontal: spacing.card,
    paddingVertical: spacing.card,
    marginBottom: 8,
  },
  draftBannerBody: { flex: 1 },
  draftBannerTitle: { fontSize: 13, fontWeight: '700', color: colors.infoText },
  draftBannerDesc: { fontSize: 11, color: colors.textSecondary, marginTop: 2 },
  draftBannerBtn: {
    backgroundColor: colors.infoBtn,
    borderRadius: 14,
    paddingHorizontal: 12,
    paddingVertical: 6,
  },
  draftBannerBtnText: { fontSize: 12, fontWeight: '700', color: colors.white },
  draftBannerDiscard: { fontSize: 12, color: colors.textSecondary },
  submitBtn: {
    flex: 2,
    height: 46,
    borderRadius: 24,
    backgroundColor: colors.primaryBtn,
    justifyContent: 'center',
    alignItems: 'center',
  },
  submitBtnDisabled: {
    opacity: 0.6,
  },
  submitText: {
    fontSize: 15,
    fontWeight: '600',
    color: colors.white,
  },
});