// Define the type for all solar terms
export type SolarTermKey =
  | "the_beginning_of_spring"
  | "rain_water"
  | "the_waking_of_insects"
  | "the_spring_equinox"
  | "pure_brightness"
  | "grain_rain"
  | "the_beginning_of_summer"
  | "lesser_fullness_of_grain"
  | "grain_in_beard"
  | "the_summer_solstice"
  | "lesser_heat"
  | "greater_heat"
  | "the_beginning_of_autumn"
  | "the_end_of_heat"
  | "white_dew"
  | "the_autumn_equinox"
  | "code_dew"
  | "frost_descent"
  | "the_beginning_of_winter"
  | "lesser_snow"
  | "greater_snow"
  | "the_winter_solstice"
  | "lesser_cold"
  | "greater_cold";

/**
 * 计算节气用的 C 值
 * 2000年的小寒、大寒、立春、雨水按照20世纪的C值来算
 * 节气: [20世纪值， 21世纪值]
 * */
export const SOLAR_TERMS_C_NUMS = {
  the_beginning_of_spring: [4.6295, 3.87],
  rain_water: [19.4599, 18.73],
  the_waking_of_insects: [6.3926, 5.63],
  the_spring_equinox: [21.4155, 20.646],
  pure_brightness: [5.59, 4.81],
  grain_rain: [20.888, 20.1],
  the_beginning_of_summer: [6.318, 5.52],
  lesser_fullness_of_grain: [21.86, 21.04],
  grain_in_beard: [6.5, 5.678],
  the_summer_solstice: [22.2, 21.37],
  lesser_heat: [7.928, 7.108],
  greater_heat: [23.65, 22.83],
  the_beginning_of_autumn: [28.35, 7.5],
  the_end_of_heat: [23.95, 23.13],
  white_dew: [8.44, 7.646],
  the_autumn_equinox: [23.822, 23.042],
  code_dew: [9.098, 8.318],
  frost_descent: [24.218, 23.438],
  the_beginning_of_winter: [8.218, 7.438],
  lesser_snow: [23.08, 22.36],
  greater_snow: [7.9, 7.18],
  the_winter_solstice: [22.6, 21.94],
  lesser_cold: [6.11, 5.4055],
  greater_cold: [20.84, 20.12],
};

/** 月份和节气对应关系 */
export const SOLAR_TERMS_MONTH: { [key: number]: SolarTermKey[] } = {
  1: ["lesser_cold", "greater_cold"],
  2: ["the_beginning_of_spring", "rain_water"],
  3: ["the_waking_of_insects", "the_spring_equinox"],
  4: ["pure_brightness", "grain_rain"],
  5: ["the_beginning_of_summer", "lesser_fullness_of_grain"],
  6: ["grain_in_beard", "the_summer_solstice"],
  7: ["lesser_heat", "greater_heat"],
  8: ["the_beginning_of_autumn", "the_end_of_heat"],
  9: ["white_dew", "the_autumn_equinox"],
  10: ["code_dew", "frost_descent"],
  11: ["the_beginning_of_winter", "lesser_snow"],
  12: ["greater_snow", "the_winter_solstice"],
};

export const SOLAR_TERMS_DELTA = {
  "2026_rain_water": -1,
  "2084_the_spring_equinox": 1,
  "1911_the_beginning_of_summer": 1,
  "2008_lesser_fullness_of_grain": 1,
  "1902_grain_in_beard": 1,
  "1928_the_summer_solstice": 1,
  "1925_lesser_heat": 1,
  "2016_lesser_heat": 1,
  "1922_greater_heat": 1,
  "2002_the_beginning_of_autumn": 1,
  "1927_white_dew": 1,
  "1942_the_autumn_equinox": 1,
  "2089_frost_descent": 1,
  "2089_the_beginning_of_winter": 1,
  "1978_lesser_snow": 1,
  "1954_greater_snow": 1,
  "1918_the_winter_solstice": -1,
  "2021_the_winter_solstice": -1,
  "1982_lesser_cold": 1,
  "2019_lesser_cold": -1,
  "2000_greater_cold": 1,
  "2082_greater_cold": 1,
};

export const SOLAR_TERMS = {
  lesser_cold: "小寒",
  greater_cold: "大寒",
  the_beginning_of_spring: "立春",
  rain_water: "雨水",
  the_waking_of_insects: "惊蛰",
  the_spring_equinox: "春分",
  pure_brightness: "清明",
  grain_rain: "谷雨",
  the_beginning_of_summer: "立夏",
  lesser_fullness_of_grain: "小满",
  grain_in_beard: "芒种",
  the_summer_solstice: "夏至",
  lesser_heat: "小暑",
  greater_heat: "大暑",
  the_beginning_of_autumn: "立秋",
  the_end_of_heat: "处暑",
  white_dew: "白露",
  the_autumn_equinox: "秋分",
  code_dew: "寒露",
  frost_descent: "霜降",
  the_beginning_of_winter: "立冬",
  lesser_snow: "小雪",
  greater_snow: "大雪",
  the_winter_solstice: "冬至",
};