import { colorFamily, hueFromRgb } from './color';
import { recombineProfiles } from './breeder';
import { bloomScoreFromPalette, generatePhenotype } from './phenotype';
import { canAttempt } from './state';
import type {
  BloomPredictionSummary,
  ColorPattern,
  CrossPrediction,
  DistributionSummary,
  GermplasmRecord,
  LabPayload,
  Rgb,
  SeedProfile,
  TraitVariable,
} from './types';

export const TRAIT_VARIABLES: TraitVariable[] = [
  { key: 'THC', label: 'THC', unit: '%', min: 0, max: 35, scale: 'numeric' },
  { key: 'CBD', label: 'CBD', unit: '%', min: 0, max: 20, scale: 'numeric' },
  { key: 'Yield', label: 'Yield', unit: 'g', min: 30, max: 140, scale: 'numeric' },
  { key: 'GrowTime', label: 'Grow Time', unit: 'd', min: 40, max: 80, scale: 'numeric' },
  { key: 'BudHue', label: 'Bud Hue', unit: 'deg', min: 0, max: 360, scale: 'circular' },
  { key: 'LeafHue', label: 'Leaf Hue', unit: 'deg', min: 0, max: 360, scale: 'circular' },
  { key: 'Stability', label: 'Stability', unit: '', min: 0, max: 1, scale: 'numeric' },
  { key: 'Volatility', label: 'Volatility', unit: '', min: 0, max: 1, scale: 'numeric' },
  { key: 'Bloom', label: 'Bloom', unit: '', min: 0, max: 100, scale: 'numeric' },
];

function generation(seed: SeedProfile, byId: Map<string, SeedProfile>, cache: Map<string, number>): number {
  const cached = cache.get(seed.seedId);
  if (cached !== undefined) return cached;
  const parentGenerations = seed.lineage
    .map((parentId) => (parentId ? byId.get(parentId) : undefined))
    .filter((parent): parent is SeedProfile => Boolean(parent))
    .map((parent) => generation(parent, byId, cache));
  const value = parentGenerations.length ? Math.max(...parentGenerations) + 1 : 0;
  cache.set(seed.seedId, value);
  return value;
}

function pedigree(seed: SeedProfile, byId: Map<string, SeedProfile>): string {
  const [parentOneId, parentTwoId] = seed.lineage;
  const parentOne = parentOneId ? byId.get(parentOneId) : undefined;
  const parentTwo = parentTwoId ? byId.get(parentTwoId) : undefined;
  if (parentOne && parentTwo) return `${parentOne.strainName} / ${parentTwo.strainName}`;
  if (parentOne) return `${parentOne.strainName} (clone)`;
  return 'founder';
}

function meanStability(seed: SeedProfile): number {
  const values = Object.values(seed.stabilities).filter((value) => Number.isFinite(value));
  return values.length ? Math.round((values.reduce((sum, value) => sum + value, 0) / values.length) * 1000) / 1000 : 0;
}

export function germplasmRecords(seeds: SeedProfile[]): GermplasmRecord[] {
  const byId = new Map(seeds.map((seed) => [seed.seedId, seed]));
  const cache = new Map<string, number>();
  return seeds.map((seed) => {
    const budHue = hueFromRgb(seed.budColor);
    const leafHue = hueFromRgb(seed.leafColor);
    const stability = meanStability(seed);
    const budBloom = bloomScoreFromPalette(seed.budPalette, seed.budPattern);
    const leafBloom = bloomScoreFromPalette(seed.leafPalette, seed.leafPattern);
    return {
      germplasmDbId: seed.seedId,
      germplasmName: seed.strainName,
      germplasmType: seed.type,
      generation: generation(seed, byId, cache),
      pedigree: pedigree(seed, byId),
      parents: seed.lineage,
      isStarter: seed.isStarter,
      stage: seed.growthStage,
      THC: seed.thc,
      CBD: seed.cbd,
      Yield: seed.yield,
      GrowTime: seed.growTime,
      BudHue: budHue,
      LeafHue: leafHue,
      Stability: stability,
      Volatility: Math.round((1 - stability) * 1000) / 1000,
      Bloom: budBloom.score,
      budColor: seed.budColor,
      leafColor: seed.leafColor,
      budPalette: seed.budPalette,
      leafPalette: seed.leafPalette,
      budPattern: seed.budPattern,
      leafPattern: seed.leafPattern,
      budBloom,
      leafBloom,
      budFamily: colorFamily(budHue),
      alleles: seed.alleles,
      attemptsUsed: seed.attemptsUsed,
      maxAttempts: seed.maxAttempts,
      canAttempt: canAttempt(seed),
    };
  });
}

function countFacet(records: GermplasmRecord[], key: keyof GermplasmRecord): Record<string, number> {
  const counts: Record<string, number> = {};
  for (const record of records) {
    const value = String(record[key]);
    counts[value] = (counts[value] ?? 0) + 1;
  }
  return Object.fromEntries(Object.entries(counts).sort(([left], [right]) => left.localeCompare(right)));
}

export function facets(records: GermplasmRecord[]): Record<string, Record<string, number>> {
  return {
    germplasmType: countFacet(records, 'germplasmType'),
    generation: countFacet(records, 'generation'),
    stage: countFacet(records, 'stage'),
    budFamily: countFacet(records, 'budFamily'),
    budPattern: countFacet(records, 'budPattern'),
  };
}

export function labPayload(seeds: SeedProfile[]): LabPayload {
  const records = germplasmRecords(seeds);
  return {
    variables: TRAIT_VARIABLES,
    records,
    facets: facets(records),
    count: records.length,
  };
}

function downsample<T>(values: T[], cap: number): T[] {
  if (values.length <= cap) return values;
  const step = values.length / cap;
  const out: T[] = [];
  for (let index = 0; index < cap; index += 1) out.push(values[Math.floor(index * step)] as T);
  return out;
}

function summarize(values: number[], keepValues = true, cap = 80): DistributionSummary {
  const sorted = [...values].sort((left, right) => left - right);
  const total = sorted.reduce((sum, value) => sum + value, 0);
  return {
    min: sorted[0] ?? 0,
    max: sorted[sorted.length - 1] ?? 0,
    mean: sorted.length ? Math.round((total / sorted.length) * 100) / 100 : 0,
    median: sorted[Math.floor(sorted.length / 2)] ?? 0,
    values: keepValues ? downsample(values, cap) : [],
  };
}

function incrementPattern(target: Record<ColorPattern, number>, pattern: ColorPattern): void {
  target[pattern] = (target[pattern] ?? 0) + 1;
}

function bloomHint(summary: { score: DistributionSummary; volatility: DistributionSummary; colorCount: DistributionSummary; maxColors: number; patterns: Record<ColorPattern, number> }): string {
  const topPattern = Object.entries(summary.patterns).sort((left, right) => right[1] - left[1])[0]?.[0] ?? 'solid';
  if (summary.maxColors >= 5 || summary.score.max >= 82) return `wild bloom lane: up to ${summary.maxColors} colors, ${topPattern} dominant`;
  if (summary.colorCount.mean >= 3.2 || summary.score.mean >= 64) return `bloom-positive: ${topPattern} bias, mean ${summary.colorCount.mean.toFixed(1)} colors`;
  if (summary.volatility.mean >= 0.42) return `volatile but unproven: color spread needs a lucky roll`;
  return `stable expression: safer traits, lower bloom odds`;
}

function bloomSummary(scores: number[], volatilities: number[], colorCounts: number[], patterns: Record<ColorPattern, number>, keepValues = true): BloomPredictionSummary {
  const summary = {
    score: summarize(scores, keepValues),
    volatility: summarize(volatilities, keepValues),
    colorCount: summarize(colorCounts, keepValues),
    maxColors: Math.max(0, ...colorCounts),
    patterns,
    hint: '',
  };
  return { ...summary, hint: bloomHint(summary) };
}

export function predictCross(parentOne: SeedProfile, parentTwo: SeedProfile, sampleCount = 200, summaryOnly = false): CrossPrediction {
  const n = Math.max(20, Math.min(1000, sampleCount));
  const thc: number[] = [];
  const cbd: number[] = [];
  const yieldValues: number[] = [];
  const growTime: number[] = [];
  const budCloud: Rgb[] = [];
  const leafCloud: Rgb[] = [];
  const budBloomScores: number[] = [];
  const leafBloomScores: number[] = [];
  const budColorCounts: number[] = [];
  const leafColorCounts: number[] = [];
  const budVolatility: number[] = [];
  const leafVolatility: number[] = [];
  const budPatterns: Record<ColorPattern, number> = { solid: 0, speckled: 0, split: 0, mosaic: 0, rimmed: 0, polycolor: 0 };
  const leafPatterns: Record<ColorPattern, number> = { solid: 0, speckled: 0, split: 0, mosaic: 0, rimmed: 0, polycolor: 0 };

  for (let index = 0; index < n; index += 1) {
    const { alleles, stabilities } = recombineProfiles(parentOne, parentTwo);
    const phenotype = generatePhenotype(alleles, stabilities);
    thc.push(Math.round(phenotype.thc * 100) / 100);
    cbd.push(Math.round(phenotype.cbd * 100) / 100);
    yieldValues.push(Math.round(phenotype.yield * 10) / 10);
    growTime.push(Math.round(phenotype.growTime * 10) / 10);
    const budBloom = bloomScoreFromPalette(phenotype.budPaletteRgb, phenotype.budPattern);
    const leafBloom = bloomScoreFromPalette(phenotype.leafPaletteRgb, phenotype.leafPattern);
    budCloud.push(phenotype.budColorRgb);
    leafCloud.push(phenotype.leafColorRgb);
    budBloomScores.push(budBloom.score);
    leafBloomScores.push(leafBloom.score);
    budColorCounts.push(budBloom.colorCount);
    leafColorCounts.push(leafBloom.colorCount);
    budVolatility.push(Math.round((1 - stabilities.BudColor) * 1000) / 1000);
    leafVolatility.push(Math.round((1 - stabilities.LeafColor) * 1000) / 1000);
    incrementPattern(budPatterns, phenotype.budPattern);
    incrementPattern(leafPatterns, phenotype.leafPattern);
  }

  const keepValues = !summaryOnly;
  return {
    n,
    parents: [parentOne.strainName, parentTwo.strainName],
    THC: summarize(thc, keepValues),
    CBD: summarize(cbd, keepValues),
    Yield: summarize(yieldValues, keepValues),
    GrowTime: summarize(growTime, keepValues),
    budCloud: summaryOnly ? [] : downsample(budCloud, 80),
    leafCloud: summaryOnly ? [] : downsample(leafCloud, 80),
    budBloom: bloomSummary(budBloomScores, budVolatility, budColorCounts, budPatterns, keepValues),
    leafBloom: bloomSummary(leafBloomScores, leafVolatility, leafColorCounts, leafPatterns, keepValues),
  };
}

function safeLabel(name: string): string {
  return name.replaceAll(',', '_').replaceAll('(', '[').replaceAll(')', ']').replaceAll(':', '-');
}

export function toNewick(seeds: SeedProfile[]): string {
  const byId = new Map(seeds.map((seed) => [seed.seedId, seed]));
  const children = new Map<string, string[]>();
  const hasParent = new Set<string>();

  for (const seed of seeds) {
    for (const parentId of seed.lineage) {
      if (parentId && byId.has(parentId)) {
        children.set(parentId, [...(children.get(parentId) ?? []), seed.seedId]);
        hasParent.add(seed.seedId);
      }
    }
  }

  const seen = new Set<string>();
  const render = (nodeId: string): string => {
    const node = byId.get(nodeId);
    if (!node) return '';
    const kids = (children.get(nodeId) ?? []).filter((kid) => !seen.has(kid));
    for (const kid of kids) seen.add(kid);
    const label = `${safeLabel(node.strainName)}#${node.seedId.slice(0, 6)}`;
    if (!kids.length) return label;
    return `(${kids.map(render).join(',')})${label}`;
  };

  const roots = seeds.map((seed) => seed.seedId).filter((seedId) => !hasParent.has(seedId));
  return `(${roots.filter((root) => !seen.has(root)).map(render).join(',')});`;
}