import '../models/divination_params.dart';
import '../models/divination_result.dart';

class DivinationResultBuilder {
  DivinationResultData build({
    required DivinationParams params,
    required List<YaoType> yaoStates,
  }) {
    final binaryCode = params.toBinary(yaoStates);
    final changedBinaryCode = params.toChangedBinary(yaoStates);
    final baseHexagram = _hexagramMap[binaryCode];
    final changedHexagram = _hexagramMap[changedBinaryCode];
    if (baseHexagram == null || changedHexagram == null) {
      throw StateError(
        'Unknown hexagram mapping for binary=$binaryCode changed=$changedBinaryCode',
      );
    }

    final signType = _signByStates(yaoStates);
    final content = _mockContent(
      params.questionType,
      params.question,
      signType,
    );

    final lineData = _buildYaoLines(yaoStates, false);
    final targetStates = _toChangedStates(yaoStates);
    final targetLineData = _buildYaoLines(targetStates, true);

    return DivinationResultData(
      params: params,
      binaryCode: binaryCode,
      changedBinaryCode: changedBinaryCode,
      guaName: baseHexagram.name,
      targetGuaName: changedHexagram.name,
      upperName: baseHexagram.upper,
      lowerName: baseHexagram.lower,
      signType: signType,
      keywords: content.keywords,
      conclusion: content.conclusion,
      analysis: content.analysis,
      suggestion: content.suggestion,
      ganzhi: const GanzhiData(
        yearGanZhi: '丙午',
        monthGanZhi: '甲辰',
        dayGanZhi: '辛亥',
        timeGanZhi: '乙巳',
        yearKongWang: '子丑',
        monthKongWang: '申酉',
        dayKongWang: '寅卯',
        timeKongWang: '午未',
        yueJian: '辰',
        riChen: '亥',
        yuePo: '戌',
        riChong: '巳',
      ),
      wuXingStatus: const {'木': '旺', '火': '相', '土': '休', '金': '囚', '水': '死'},
      yaoLines: lineData,
      targetYaoLines: targetLineData,
    );
  }

  List<YaoLineData> _buildYaoLines(List<YaoType> states, bool target) {
    const spirits = ['龙', '雀', '勾', '蛇', '虎', '玄'];
    const relations = ['父母', '兄弟', '官鬼', '妻财', '子孙', '父母'];
    const branches = ['子', '寅', '辰', '午', '申', '戌'];
    const elements = ['水', '木', '土', '火', '金', '土'];
    return List<YaoLineData>.generate(6, (idx) {
      final mark = switch (idx) {
        1 => '应',
        4 => '世',
        _ => '',
      };
      return YaoLineData(
        index: idx,
        spirit: spirits[idx],
        relation: relations[idx],
        branch: branches[idx],
        element: elements[idx],
        type: states[idx],
        mark: target ? '' : mark,
      );
    });
  }

  List<YaoType> _toChangedStates(List<YaoType> source) {
    return source.map((state) {
      return switch (state) {
        YaoType.oldYang => YaoType.youngYin,
        YaoType.oldYin => YaoType.youngYang,
        _ => state,
      };
    }).toList();
  }

  String _signByStates(List<YaoType> states) {
    final dynamicCount = states
        .where((e) => e == YaoType.oldYang || e == YaoType.oldYin)
        .length;
    if (dynamicCount <= 1) {
      return '上上签';
    }
    if (dynamicCount <= 3) {
      return '中上签';
    }
    return '中下签';
  }

  _MockContent _mockContent(
    QuestionType type,
    String question,
    String signType,
  ) {
    final domain = switch (type) {
      QuestionType.career || QuestionType.study => '事业与成长',
      QuestionType.love => '关系与情感',
      QuestionType.wealth => '财富与资源',
      QuestionType.fortune => '阶段运势',
      QuestionType.dream => '潜意识信号',
      QuestionType.health => '身心节律',
      QuestionType.search => '寻物线索',
      QuestionType.other => '综合事项',
    };
    return _MockContent(
      keywords: '$signType · $domain',
      conclusion: '这个卦象的结果为$signType。你关注的“$question”处于可推进阶段，当前节奏重在稳步而行，不宜急进。',
      analysis:
          '本卦显示外在条件逐步成形，内在决心也在增强。若短期遇到反复，通常是资源重组与信息修正，并非方向错误。建议将目标拆分为可验证的小节点，持续复盘。',
      suggestion:
          '建议一：先定三周内可执行动作并按日推进。\n建议二：重要决定留有缓冲期，避免情绪化判断。\n建议三：遇到阻滞先调整节奏，再补关键资源。',
    );
  }
}

class _MockContent {
  const _MockContent({
    required this.keywords,
    required this.conclusion,
    required this.analysis,
    required this.suggestion,
  });

  final String keywords;
  final String conclusion;
  final String analysis;
  final String suggestion;
}

class _HexagramShort {
  const _HexagramShort(this.name, this.upper, this.lower);

  final String name;
  final String upper;
  final String lower;
}

const Map<String, _HexagramShort> _hexagramMap = {
  '111111': _HexagramShort('乾为天', '乾', '乾'),
  '011111': _HexagramShort('天风姤', '乾', '巽'),
  '001111': _HexagramShort('天山遁', '乾', '艮'),
  '000111': _HexagramShort('天地否', '乾', '坤'),
  '000011': _HexagramShort('风地观', '巽', '坤'),
  '000001': _HexagramShort('山地剥', '艮', '坤'),
  '000101': _HexagramShort('火地晋', '离', '坤'),
  '111101': _HexagramShort('火天大有', '离', '乾'),
  '010010': _HexagramShort('坎为水', '坎', '坎'),
  '110010': _HexagramShort('水泽节', '坎', '兑'),
  '100010': _HexagramShort('水雷屯', '坎', '震'),
  '101010': _HexagramShort('水火既济', '坎', '离'),
  '101110': _HexagramShort('泽火革', '兑', '离'),
  '101100': _HexagramShort('雷火丰', '震', '离'),
  '101000': _HexagramShort('地火明夷', '坤', '离'),
  '010000': _HexagramShort('地水师', '坤', '坎'),
  '001001': _HexagramShort('艮为山', '艮', '艮'),
  '101001': _HexagramShort('山火贲', '艮', '离'),
  '111001': _HexagramShort('山天大畜', '艮', '乾'),
  '110001': _HexagramShort('山泽损', '艮', '兑'),
  '110101': _HexagramShort('火泽睽', '离', '兑'),
  '110111': _HexagramShort('天泽履', '乾', '兑'),
  '110011': _HexagramShort('风泽中孚', '巽', '兑'),
  '001011': _HexagramShort('风山渐', '巽', '艮'),
  '100100': _HexagramShort('震为雷', '震', '震'),
  '000100': _HexagramShort('雷地豫', '震', '坤'),
  '010100': _HexagramShort('雷水解', '震', '坎'),
  '011100': _HexagramShort('雷风恒', '震', '巽'),
  '011000': _HexagramShort('地风升', '坤', '巽'),
  '011010': _HexagramShort('水风井', '坎', '巽'),
  '011110': _HexagramShort('泽风大过', '兑', '巽'),
  '100110': _HexagramShort('泽雷随', '兑', '震'),
  '011011': _HexagramShort('巽为风', '巽', '巽'),
  '111011': _HexagramShort('风天小畜', '巽', '乾'),
  '101011': _HexagramShort('风火家人', '巽', '离'),
  '100011': _HexagramShort('风雷益', '巽', '震'),
  '100111': _HexagramShort('天雷无妄', '乾', '震'),
  '100101': _HexagramShort('火雷噬嗑', '离', '震'),
  '100001': _HexagramShort('山雷颐', '艮', '震'),
  '011001': _HexagramShort('山风蛊', '艮', '巽'),
  '101101': _HexagramShort('离为火', '离', '离'),
  '001101': _HexagramShort('火山旅', '离', '艮'),
  '011101': _HexagramShort('火风鼎', '离', '巽'),
  '010101': _HexagramShort('火水未济', '离', '坎'),
  '010001': _HexagramShort('山水蒙', '艮', '坎'),
  '010011': _HexagramShort('风水涣', '巽', '坎'),
  '010111': _HexagramShort('天水讼', '乾', '坎'),
  '101111': _HexagramShort('天火同人', '乾', '离'),
  '000000': _HexagramShort('坤为地', '坤', '坤'),
  '100000': _HexagramShort('地雷复', '坤', '震'),
  '110000': _HexagramShort('地泽临', '坤', '兑'),
  '111000': _HexagramShort('地天泰', '坤', '乾'),
  '111100': _HexagramShort('雷天大壮', '震', '乾'),
  '111110': _HexagramShort('泽天夬', '兑', '乾'),
  '111010': _HexagramShort('水天需', '坎', '乾'),
  '000010': _HexagramShort('水地比', '坎', '坤'),
  '110110': _HexagramShort('兑为泽', '兑', '兑'),
  '010110': _HexagramShort('泽水困', '兑', '坎'),
  '000110': _HexagramShort('泽地萃', '兑', '坤'),
  '001110': _HexagramShort('泽山咸', '兑', '艮'),
  '001010': _HexagramShort('水山蹇', '坎', '艮'),
  '001000': _HexagramShort('地山谦', '坤', '艮'),
  '001100': _HexagramShort('雷山小过', '震', '艮'),
  '110100': _HexagramShort('雷泽归妹', '震', '兑'),
};