/**
 * Initiative Activity — derives current activity state from initiative + phases.
 */

import type { Initiative, Phase } from '../../db/schema.js';
import type { InitiativeActivity, InitiativeActivityState } from '@codewalk-district/shared';

export interface ActiveArchitectAgent {
  initiativeId: string;
  mode: string;
  status: string;
}

const MODE_TO_STATE: Record<string, InitiativeActivityState> = {
  discuss: 'discussing',
  plan: 'detailing',
  detail: 'detailing',
  refine: 'refining',
};

export function deriveInitiativeActivity(
  initiative: Initiative,
  phases: Phase[],
  activeArchitectAgents?: ActiveArchitectAgent[],
): InitiativeActivity {
  const phasesTotal = phases.length;
  const phasesCompleted = phases.filter(p => p.status === 'completed').length;
  const base = { phasesTotal, phasesCompleted };

  if (initiative.status === 'archived') {
    return { ...base, state: 'archived' };
  }
  if (initiative.status === 'pending_review') {
    return { ...base, state: 'pending_review' };
  }
  if (initiative.status === 'completed') {
    return { ...base, state: 'complete' };
  }

  // Check for active architect agents BEFORE zero-phases check
  // so architect agents (discuss/plan/detail/refine) surface activity
  const activeAgent = activeArchitectAgents?.find(
    a => a.initiativeId === initiative.id
      && (a.status === 'running' || a.status === 'waiting_for_input'),
  );
  if (activeAgent) {
    const state = MODE_TO_STATE[activeAgent.mode] ?? 'detailing';
    return { ...base, state };
  }

  if (phasesTotal === 0) {
    return { ...base, state: 'idle' };
  }

  // Priority-ordered state detection (first match wins)
  const priorities: Array<{ status: Phase['status']; state: InitiativeActivityState }> = [
    { status: 'pending_review', state: 'pending_review' },
    { status: 'in_progress', state: 'executing' },
    { status: 'blocked', state: 'blocked' },
  ];

  for (const { status, state } of priorities) {
    const match = phases.find(p => p.status === status);
    if (match) {
      return { ...base, state, activePhase: { id: match.id, name: match.name } };
    }
  }

  if (phasesCompleted === phasesTotal) {
    return { ...base, state: 'complete' };
  }

  const approved = phases.find(p => p.status === 'approved');
  if (approved) {
    return { ...base, state: 'ready', activePhase: { id: approved.id, name: approved.name } };
  }

  return { ...base, state: 'planning' };
}