import {
  analyzeKeywords,
  expandQueries,
  inferTargets,
  inferTemporalMode,
  isTemporalRecallQuery,
} from './keyword-rules.mjs';
import { parseTimeScope } from './time-parser.mjs';

function envCalendarEnabled() {
  const raw = String(process.env.MEMIND_TEMPORAL_RECALL_CALENDAR_ENABLED ?? '1').trim().toLowerCase();
  return ['1', 'true', 'yes', 'on'].includes(raw);
}

/**
 * @param {{ query: string, user_id: string, now?: Date, planner_level?: string }} input
 */
export function buildContextPlan(input) {
  const query = String(input.query ?? '').trim();
  const now = input.now instanceof Date ? input.now : new Date(input.now ?? Date.now());
  const planner_level = input.planner_level ?? 'auto';

  if (!query) {
    throw new Error('invalid_query');
  }

  if (planner_level === 'semantic') {
    const err = new Error('semantic planner not implemented in v0.1');
    err.code = 'not_implemented';
    throw err;
  }

  const temporal = isTemporalRecallQuery(query);
  if (!temporal) {
    return {
      query_type: 'general_chat',
      time: {
        mention_range: parseTimeScope('这周', now).mention_range,
        event_range: null,
        relative_label: 'this_week',
      },
      temporal_mode: 'AMBIGUOUS',
      targets: [{ type: 'mention', weight: 0.5 }],
      sources: { calendar: 0.2, chat: 0.4, meinput: 0.4, memory_v2: 0.3 },
      retrievals: [],
      filters: { importance_min: 0.35, status: 'any' },
      output: { group_by: 'importance', dedupe: true, timeline: true, wide_recall: true, max_items: 50 },
      context_needs: {
        user_snapshot: 'REQUIRED',
        temporal_recall: 'SKIP',
        memory_retrieval: 'SKIP',
      },
      planner_meta: { level: 'cheap_router', rule_hits: ['query:general_chat'], confidence: 0.9 },
    };
  }

  const time = parseTimeScope(query, now);
  const kw = analyzeKeywords(query);
  const targets = inferTargets(query, kw);
  const temporal_mode = inferTemporalMode(query);
  const rule_hits = [...time.rule_hits, ...kw.rule_hits, `temporal_mode:${temporal_mode}`];

  const sources = { ...kw.sources };
  if (temporal_mode === 'PLANNED_IN' || temporal_mode === 'DUE_IN') {
    sources.calendar = Math.min(1, sources.calendar + 0.2);
  }
  if (temporal_mode === 'MENTIONED_IN' || temporal_mode === 'CREATED_IN') {
    sources.meinput = Math.min(1, sources.meinput + 0.15);
    sources.chat = Math.min(1, sources.chat + 0.15);
  }

  const skip_below = 0.3;
  const retrievals = [];
  for (const [source, weight] of Object.entries(sources)) {
    if (weight < skip_below) continue;
    if (source === 'calendar' && !envCalendarEnabled()) continue;
    retrievals.push({
      source,
      query_type:
        source === 'meinput'
          ? 'important_mentions'
          : source === 'chat'
            ? 'commitments_and_decisions'
            : source === 'calendar'
              ? 'events'
              : 'time_bounded',
      expanded_queries: expandQueries(source, query, kw.commitmentKeywords),
      weight: Number(weight.toFixed(2)),
      skip_below,
    });
  }

  retrievals.sort((a, b) => b.weight - a.weight);

  const memoryHint = /决定|定了|上次|记得|记住/.test(query);
  const context_needs = {
    user_snapshot: 'OPTIONAL',
    temporal_recall: 'REQUIRED',
    memory_retrieval: memoryHint ? 'OPTIONAL' : 'SKIP',
  };

  return {
    query_type: 'personal_temporal_recall',
    time: {
      mention_range: time.mention_range,
      event_range: time.event_range,
      relative_label: time.relative_label,
    },
    temporal_mode,
    targets,
    sources: Object.fromEntries(
      Object.entries(sources).map(([k, v]) => [k, Number(v.toFixed(2))]),
    ),
    retrievals,
    filters: {
      importance_min: kw.importance_min,
      status: /还没|未完成|没做|待/.test(query) ? 'unresolved' : 'any',
    },
    output: {
      group_by: temporal_mode === 'AMBIGUOUS' ? 'importance' : 'time',
      dedupe: true,
      timeline: true,
      wide_recall: true,
      max_items: 50,
    },
    context_needs,
    planner_meta: {
      level: 'cheap_router',
      rule_hits,
      confidence: Math.min(0.95, 0.65 + retrievals.length * 0.08),
    },
  };
}