import type { GameState, EventDefinition, AchievementDefinition } from '@ai-tycoon/shared';
import { processEconomy } from './systems/economySystem';
import { processInfrastructure } from './systems/infrastructureSystem';
import { processCompute } from './systems/computeSystem';
import { processResearch } from './systems/researchSystem';
import { processModels } from './systems/modelSystem';
import { processMarket } from './systems/marketSystem';
import { processReputation } from './systems/reputationSystem';
import { processTalent } from './systems/talentSystem';
import { processEvents } from './systems/eventSystem';
import { processCompetitors } from './systems/competitorSystem';
import { processData } from './systems/dataSystem';
import { checkEraTransition } from './systems/eraSystem';
import { processAchievements } from './systems/achievementSystem';
import { computeValuation } from './systems/fundingSystem';

export interface TickResult {
  state: Partial<GameState>;
  notifications: TickNotification[];
}

export interface TickNotification {
  title: string;
  message: string;
  type: 'info' | 'success' | 'warning' | 'danger';
}

let cachedEventDefs: EventDefinition[] | null = null;
let cachedAchievementDefs: AchievementDefinition[] | null = null;

export function setEventDefinitions(defs: EventDefinition[]) {
  cachedEventDefs = defs;
}

export function setAchievementDefinitions(defs: AchievementDefinition[]) {
  cachedAchievementDefs = defs;
}

export function processTick(state: GameState): Partial<GameState> {
  const notifications: TickNotification[] = [];

  const infrastructure = processInfrastructure(state);

  const stateWithInfra = { ...state, infrastructure };
  const modelResult = processModels(stateWithInfra);

  if (modelResult.modelCompleted) {
    notifications.push({
      title: 'Training Complete',
      message: `${modelResult.modelCompleted.name} is ready! Benchmark: ${modelResult.modelCompleted.benchmarkScore.toFixed(1)}/100`,
      type: 'success',
    });
  }

  const stateWithModels = { ...stateWithInfra, models: modelResult.modelsState };
  const market = processMarket(stateWithModels, state.compute);

  const compute = processCompute(state, infrastructure);
  compute.tokensPerSecondDemand = market.totalTokenDemand;
  compute.inferenceUtilization = compute.tokensPerSecondCapacity > 0
    ? Math.min(1, market.totalTokenDemand / compute.tokensPerSecondCapacity)
    : 0;

  const talent = processTalent(stateWithModels);
  const stateWithTalent = { ...stateWithModels, talent };
  const researchResult = processResearch(stateWithTalent, compute);

  if (researchResult.researchCompleted) {
    notifications.push({
      title: 'Research Complete',
      message: `${researchResult.researchCompleted} has been unlocked!`,
      type: 'success',
    });
  }

  const reputationResult = processReputation(stateWithTalent);
  const { _safetyIncident, ...reputation } = reputationResult;
  if (_safetyIncident) {
    notifications.push({
      title: 'Safety Incident!',
      message: 'Your AI model caused a safety incident. Public trust and safety record damaged.',
      type: 'danger',
    });
  }
  const economy = processEconomy(stateWithTalent, market, infrastructure);
  const data = processData(stateWithTalent);
  const competitors = processCompetitors(stateWithTalent);

  const eventResult = cachedEventDefs
    ? processEvents(stateWithTalent, cachedEventDefs)
    : { events: state.events, newEvents: [] };

  for (const evt of eventResult.newEvents) {
    notifications.push({
      title: evt.title,
      message: evt.description,
      type: evt.category === 'regulatory' ? 'warning' : 'info',
    });
  }

  const tickCount = state.meta.tickCount + 1;

  let meta = {
    ...state.meta,
    tickCount,
    lastTickTimestamp: Date.now(),
    totalPlayTime: state.meta.totalPlayTime + 1,
  };

  const newEra = checkEraTransition({ ...stateWithTalent, economy, reputation, research: researchResult.research });
  if (newEra) {
    meta = { ...meta, currentEra: newEra };
    notifications.push({
      title: 'Era Transition!',
      message: `Your company has entered the ${newEra === 'scaleup' ? 'Scale-up' : newEra === 'bigtech' ? 'Big Tech' : 'AGI'} era!`,
      type: 'success',
    });
  }

  const valuation = computeValuation({ ...stateWithTalent, economy, reputation, research: researchResult.research });
  const updatedEconomy = {
    ...economy,
    funding: { ...economy.funding, valuation },
  };

  const stateForAchievements: GameState = {
    ...stateWithTalent,
    meta,
    economy: updatedEconomy,
    infrastructure,
    compute,
    research: researchResult.research,
    models: modelResult.modelsState,
    market: market.marketState,
    reputation,
    data,
    competitors,
    events: eventResult.events,
    achievements: state.achievements,
  };

  const achievementResult = cachedAchievementDefs
    ? processAchievements(stateForAchievements, cachedAchievementDefs)
    : { achievements: state.achievements, newAchievements: [] };

  for (const name of achievementResult.newAchievements) {
    notifications.push({
      title: 'Achievement Unlocked!',
      message: name,
      type: 'success',
    });
  }

  const result: Partial<GameState> = {
    meta,
    economy: updatedEconomy,
    infrastructure,
    compute,
    research: researchResult.research,
    models: modelResult.modelsState,
    market: market.marketState,
    talent,
    reputation,
    data,
    competitors,
    events: eventResult.events,
    achievements: achievementResult.achievements,
  };

  (result as Record<string, unknown>)['_notifications'] = notifications;

  return result;
}