// Politics tuning: public opinion, approval penalties, propaganda campaigns,
// minority policies, migration, war crimes, uprisings and cultural impact.
//
// Every population (an ethnicity, indexed like the civilisations) holds an
// opinion of every other ethnicity and of every government. Opinions run from 0
// (hatred) to 1 (devotion) and start at the neutral 50%. All of it lives in
// shared/game_state/politics.js so the server simulates it and the browser only
// reads it from the snapshot.

// The opinion scale. `driftPerDay` pulls every opinion back toward the neutral
// baseline; at this rate the full 0..1 span recovers over roughly 45 years, so
// a campaign's goodwill lingers for years while a war crime is not forgotten
// for a generation.
export const OPINION = {
  baseline: 0.5,
  driftPerDay: 1.0 / (365.25 * 45),
  min: 0.0,
  max: 1.0,
};

// A region whose people approve of their government by less than
// `rebellionThreshold` suffers the penalties below. Construction slows
// exponentially as approval falls and the tax take collapses toward
// `taxFloorFraction` of its normal value.
export const APPROVAL = {
  rebellionThreshold: 0.1,
  constructionExponent: 2.5,
  taxFloorFraction: 0.1,
};

// Popularity is counted in integer points, centred on 0 (neutral). The whole
// 0..1 opinion scale maps to -100..+100 points, one point being half a percent.
// What the player sees is a logistic of those points: 0 points reads 50%, +100
// reads 75% and -100 reads 25%. Opinions drift one point an hour toward
// neutrality, and war, captures and casualties move them in points.
export const POPULARITY = {
  opinionPerPoint: 0.005,
  // Steepness chosen so display(0) = 0.5 and display(100) = 0.75.
  logisticScale: Math.log(3) / 100,
  // Points a population's opinion of its government moves toward neutral each
  // hour, in either direction.
  driftPerHour: 1,
  // Declaring war costs the aggressor this many points with every population.
  declareWar: 8,
  // Being declared on grants the victim this many points with its own people,
  // but only when the aggressor was already loathed there (below threshold).
  declaredOnBoost: 15,
  declaredOnThreshold: 0.15,
  // Points won or lost per military unit destroyed, and per city taken.
  unitLoss: 1,
  unitKill: 1,
  cityLoss: 10,
  cityCapture: 10,
  // Pillaging a tile costs the aggressor standing with the whole world, doubled
  // among the populations directly affected.
  pillage: 6,
};

// A campaign costs nothing to start: it charges `defaultHourlyCost` for as long
// as it runs, like any other upkeep and shown in the budget. The player may
// raise or lower the spending up to `maxHourlyCost`; the opinion shift scales
// with it. A campaign stays in force until cancelled. `dailyDelta` is the
// opinion shift per day at the default spend and balanced cultural impact;
// `culturalWeight` is how strongly the two nations' cultural impacts bend the
// result.
//
// Convincing the last few points is the hardest: the daily shift is scaled by
// how much room is left before the opinion reaches its maximum (warming) or
// minimum (cooling), raised to `difficultyExponent`. The rate is unchanged at
// or below the neutral midpoint, so only the final approach to a devoted or
// hateful population suffers the diminishing returns that make the last
// percentage points disproportionately expensive.
//
// Opinions otherwise drift one point an hour toward neutral (0.12 a day), so a
// campaign must out-spend that drift to change minds; `dailyDelta` is set well
// above it.
export const PROPAGANDA = {
  defaultHourlyCost: 8_000,
  maxHourlyCost: 40_000,
  dailyDelta: 0.18,
  culturalWeight: 0.6,
  difficultyExponent: 2,
};

export const CAMPAIGN_ETHNICITY = "ethnicity";
export const CAMPAIGN_GOVERNMENT = "government";

// Minority policies a government may proclaim. Any number may be active at
// once, but the same policy may not be enacted twice for the same ethnicity.
// `targetEffect` and `politicalCost` are the estimates the wizard shows; the
// model applies them through POLICY_OPINION below. Effects are stated in
// popularity points (the integer unit the model works in); only the final
// approval figure is ever shown as a percentage.
export const POLICY_CHAMPION = "champion";
export const POLICY_EXPEL = "expel";
export const POLICY_PROTECT = "protect";
export const POLICY_IMMIGRATION = "immigration";

export const POLICIES = [
  {
    id: POLICY_CHAMPION,
    name: "Champion a minority",
    description:
      "Proclaim the state the protector of an ethnicity. Its people everywhere warm to you, but your own other populations resent the favouritism.",
    targetEffect: "+30 popularity among the chosen people",
    politicalCost: "−16 popularity among every other population in your country",
  },
  {
    id: POLICY_PROTECT,
    name: "Protect a minority",
    description:
      "Shield an ethnicity inside your borders. It raises their view of you at home and abroad, at some cost with your other populations.",
    targetEffect: "+24 popularity among the chosen people",
    politicalCost: "−8 popularity among every other population in your country",
  },
  {
    id: POLICY_EXPEL,
    name: "Expel a minority",
    description:
      "Force an ethnicity out of the country. Its people, in and outside your borders, will hate you for a long time, and they will press into your neighbours.",
    targetEffect: "The people begin to leave for neighbouring countries",
    politicalCost: "−80 popularity among the expelled people, remembered for a generation",
  },
  {
    id: POLICY_IMMIGRATION,
    name: "Encourage immigration",
    description:
      "Invite an ethnicity in. They will come from lands where their government is unpopular, but every other population in your country dislikes the influx.",
    targetEffect: "The chosen people migrate into your country",
    politicalCost: "−10 popularity among every other population in your country",
  },
];

export function policyById(id) {
  return POLICIES.find((policy) => policy.id === id) || null;
}

// Immediate opinion shifts of proclaiming each policy, addressed to the target
// ethnicity and to the rest of the nation's people.
export const POLICY_OPINION = {
  championTarget: 0.15,
  championMajority: -0.08,
  protectTarget: 0.12,
  protectMajority: -0.04,
  expelTarget: -0.4,
  immigrationOthers: -0.05,
};

// Daily share of a minority that is expelled to neighbouring tiles, and the
// rate at which an encouraged ethnicity is drawn into the country. Immigration
// is scaled by how much the newcomer dislikes their current government:
// a 5% approval government sheds people fast, a 90% one holds them.
export const MIGRATION = {
  expelSharePerDay: 0.004,
  immigrationSharePerDay: 0.002,
  // People fly from any other airport city into a city with an airport. The
  // share is per destination airport level, per source city, per day.
  airportSharePerDay: 0.0005,
  // The approval at or above which nobody is inclined to leave.
  comfortableApproval: 0.9,

  // People move only to a region at least this much richer per head, and the
  // bar rises with the travel time: a destination `time` hours away must be
  // `incomeRatioBase * (1 + time * incomeTimePenalty)` times as rich. So the
  // closer and richer a place is, the more attractive.
  incomeRatioBase: 2,
  incomeTimePenalty: 0.02,
  // People travel the transport network; a tile of open terrain costs this many
  // hours at walking pace, a road or railway less, open water a flat sea rate.
  peopleSpeed: 1,
  seaHoursPerTile: 1.5,
  // Land routes are only traced this far; beyond it a destination is reachable
  // only by air.
  maxTravelHours: 120,
  // Of the people who qualify, this share of the poorer region moves per day,
  // scaled by how far the ratio clears the bar and capped.
  incomeSharePerDay: 0.0015,
  incomeGapCap: 1,
  // No single day moves more than this share of a region's people by land.
  incomeMaxSharePerDay: 0.005,
  // An airport flies people over the distance at a flat time cost, but moves at
  // most this many people per day for each airport level on the route.
  airHours: 6,
  airPeoplePerDayPerLevel: 1000,

  // At generation, regions of a nation trade people until their production per
  // head is level. `equalizeTolerance` is the residual spread accepted and
  // `equalizePasses` bounds the refinement; no region is emptied below
  // `minRegionPopulation`.
  equalizeTolerance: 0.005,
  equalizePasses: 30,
  minRegionPopulation: 20000,
};

// A pillaged tile is a war crime. The people of the tile loathe the aggressor
// immediately; the stain spreads to neighbours, the region, the victim nation
// and the watching world, and is remembered for a generation.
export const WAR_CRIME = {
  tileOpinion: 0.35,
  tileEthnicOpinion: 0.2,
  neighbourFactor: 0.5,
  regionalFactor: 0.3,
  nationalFactor: 0.2,
  worldFactor: 0.08,
  memoryYears: 25,
};

// A mistreated minority rises up when it hates its government and adores the
// one that shares its ethnicity, taking up arms for the latter.
export const REBELLION = {
  approvalMax: 0.1,
  championApprovalMin: 0.7,
  populationShareMin: 0.12,
  cooldownDays: 60,
  maxUnitsPerEthnicity: 8,
};

// Declaring war on a government its people like costs the aggressor dear; a war
// on a loathed government can even be popular. The penalty scales with how far
// the onlookers' opinion of the victim strays from neutral.
export const WAR_DECLARATION = {
  penalty: 0.3,
};

// Cultural impact is a nation's share of the world's cultural output, so it is
// zero-sum by construction. A nation above the average impact slowly wins the
// world over to its government.
export const CULTURE_IMPACT = {
  dailyPopularityGain: 0.0004,
};