export interface DaySnapshot {
  date: string;
  adventureSlots: number;
  adventureTouched: number;
  exerciseDone: boolean;
  workHours: number;
  workTarget: number;
  sleepLogged: boolean;
  classesDone: number;
  teachingDone: boolean;
  explorationsDone: number;
  prayerChecks: number;
  prayerTotal: number;
  litanyChecks: number;
  litanyTotal: number;
  pagesRead: number;
  readingGoalWeekly: number;
  hadSpiritualEver: boolean;
}

function decayWeight(daysAgo: number): number {
  return Math.exp(-daysAgo / 10);
}

export function computeConsistencyScore(days: DaySnapshot[]): number {
  if (days.length === 0) return 0;
  let weighted = 0;
  let totalWeight = 0;
  days.forEach((d, i) => {
    const w = decayWeight(i);
    totalWeight += w;
    if (d.adventureSlots === 0) {
      weighted += w * 50;
      return;
    }
    weighted += w * (d.adventureTouched / d.adventureSlots) * 100;
  });
  return Math.round(weighted / totalWeight);
}

export function computeDisciplineScore(days: DaySnapshot[]): number {
  if (days.length === 0) return 0;
  let weighted = 0;
  let totalWeight = 0;
  days.forEach((d, i) => {
    const w = decayWeight(i);
    totalWeight += w;
    const exercise = d.exerciseDone ? 100 : 0;
    const sleep = d.sleepLogged ? 100 : 50;
    const work =
      d.workTarget > 0
        ? Math.min(100, (d.workHours / d.workTarget) * 100)
        : 50;
    weighted += w * (exercise * 0.4 + sleep * 0.3 + work * 0.3);
  });
  return Math.round(weighted / totalWeight);
}

export function computeLearningScore(days: DaySnapshot[]): number {
  if (days.length === 0) return 0;
  let weighted = 0;
  let totalWeight = 0;
  days.forEach((d, i) => {
    const w = decayWeight(i);
    totalWeight += w;
    let dayScore = 0;
    if (d.classesDone > 0) dayScore += 40;
    if (d.teachingDone) dayScore += 30;
    if (d.explorationsDone > 0) dayScore += 30;
    weighted += w * Math.min(100, dayScore);
  });
  return Math.round(weighted / totalWeight);
}

export function computeSpiritualScore(days: DaySnapshot[]): number {
  const hadEver = days.some((d) => d.hadSpiritualEver);
  if (days.length === 0) return hadEver ? 20 : 0;
  let weighted = 0;
  let totalWeight = 0;
  days.forEach((d, i) => {
    const w = decayWeight(i);
    totalWeight += w;
    const total = d.prayerTotal + d.litanyTotal;
    const checked = d.prayerChecks + d.litanyChecks;
    const rate = total > 0 ? (checked / total) * 100 : 0;
    weighted += w * rate;
  });
  const score = Math.round(weighted / totalWeight);
  return hadEver ? Math.max(20, score) : score;
}

export function computeHealthScore(days: DaySnapshot[]): number {
  if (days.length === 0) return 0;
  let weighted = 0;
  let totalWeight = 0;
  days.forEach((d, i) => {
    const w = decayWeight(i);
    totalWeight += w;
    const exercise = d.exerciseDone ? 100 : 0;
    const sleep = d.sleepLogged ? 100 : 40;
    weighted += w * (exercise * 0.6 + sleep * 0.4);
  });
  return Math.round(weighted / totalWeight);
}

export function computeReadingScore(
  days: DaySnapshot[],
  weeklyGoal: number
): number {
  if (days.length === 0) return 0;
  const recentWeek = days.slice(0, 7);
  const pages = recentWeek.reduce((s, d) => s + d.pagesRead, 0);
  const goalScore = weeklyGoal > 0 ? Math.min(100, (pages / weeklyGoal) * 100) : 50;
  let streakBonus = 0;
  let streak = 0;
  for (const d of days) {
    if (d.pagesRead > 0) streak++;
    else break;
  }
  if (streak >= 7) streakBonus = 20;
  else if (streak >= 3) streakBonus = 10;
  return Math.min(100, Math.round(goalScore * 0.8 + streakBonus));
}

export function computeAllScores(
  days: DaySnapshot[],
  weeklyReadingGoal: number
) {
  return {
    consistencyScore: computeConsistencyScore(days),
    disciplineScore: computeDisciplineScore(days),
    learningScore: computeLearningScore(days),
    spiritualScore: computeSpiritualScore(days),
    healthScore: computeHealthScore(days),
    readingScore: computeReadingScore(days, weeklyReadingGoal),
  };
}