// src/services/voiceDiag/checks/callForwarding.js
//
// Detects Webex Calling forwarding variants on the store's canonical
// user. Endpoint returns three sub-blocks that are all evaluated in a
// single API round-trip:
//
//   {
//     callForwarding: {
//       always:   { enabled, destination, destinationVoicemailEnabled, ringReminderEnabled },
//       busy:     { enabled, destination, destinationVoicemailEnabled },
//       noAnswer: { enabled, destination, numberOfRings, destinationVoicemailEnabled, systemMaxNumberOfRings }
//     },
//     businessContinuity: { enabled, destination, ... }   // optional; not fixed here
//   }
//
// Endpoint: GET/PUT /v1/people/{personId}/features/callForwarding
// Scope:    spark-admin:people_read (GET) + spark-admin:people_write (PUT).
//
// Because PUT expects the full callForwarding object shape (partial
// updates are rejected as bad request in practice), remediation
// fetches fresh state right before writing and only mutates the
// targeted variant's `enabled` flag. This avoids clobbering a
// destination the operator might still want configured for the day
// they re-enable it — clearing forwarding in Control Hub UI works the
// same way (leaves the destination string intact).
//
// Severity rules:
//   - Any variant with enabled=true → warn (with per-variant
//     remediation card).
//   - `always` forwarded to a destination outside the +1AE prefix
//     range is currently just noted in the message, not upgraded to
//     an error — the plan calls it out but false positives on hand-
//     entered destinations are high enough that we keep it at warn
//     for now and let the operator judge.

import { logger } from '../../../utils/logger.js';
import { describeRequester } from '../../../utils/requester.js';

const ENDPOINT = (personId) =>
  `people/${personId}/features/callForwarding`;

/** Registered forwarding variants + their human labels. Order matters
 * for stable messages / audit lines. */
const VARIANTS = [
  { key: 'always',   label: 'Call Forwarding — Always' },
  { key: 'busy',     label: 'Call Forwarding — Busy' },
  { key: 'noAnswer', label: 'Call Forwarding — No Answer' },
];

// Store-line standard: no forwarding of any variant. Forwarding a
// store line silently routes calls elsewhere, which is a top cause
// of "the store phone isn't ringing" tickets. Hard rule → error
// severity (was warn in the initial cut).
export const CALL_FORWARDING_STANDARDS = Object.freeze({
  always:   { enabled: false },
  busy:     { enabled: false },
  noAnswer: { enabled: false },
});

export const callForwardingCheck = {
  id: 'callForwarding',
  label: 'Call Forwarding',
  requires: ['personId'],
  scope: 'spark-admin:people_read',
  standards: CALL_FORWARDING_STANDARDS,

  async run(ctx) {
    const data = await ctx.webex.request('GET', ENDPOINT(ctx.personId));
    const cf = data?.callForwarding || {};

    const perVariant = VARIANTS.map(({ key, label }) => {
      const v = cf[key] || {};
      return {
        key,
        label,
        enabled: !!v.enabled,
        destination: v.destination || null,
        destinationVoicemailEnabled: !!v.destinationVoicemailEnabled,
        numberOfRings: v.numberOfRings ?? null,
      };
    });

    const active = perVariant.filter((v) => v.enabled);

    if (active.length === 0) {
      return {
        status: 'ok',
        message: 'No forwarding variants are active.',
        details: { perVariant },
        remediation: null,
      };
    }

    // A single check produces at most one remediation card in this
    // architecture. When multiple forwarding variants are active, we
    // build a compound remediation carrying every enabled variant —
    // one PUT clears them all in a single button click, which is
    // what the operator wants ("stop everything forwarding this user").
    const variantsToClear = active.map((v) => v.key);
    const summaryLine = active
      .map((v) => `${v.label} → ${v.destination || 'unspecified'}`)
      .join('; ');

    return {
      status: 'error',
      message:
        `${active.length} forwarding ${active.length === 1 ? 'variant is' : 'variants are'} ` +
        `active: ${summaryLine}. Store phone standard requires all forwarding disabled.`,
      details: { perVariant, active: variantsToClear },
      remediation: {
        action: 'clear_call_forwarding',
        title:
          active.length === 1
            ? `Turn off ${active[0].label}`
            : `Turn off ${active.length} forwarding variants`,
        summary:
          active.length === 1
            ? `Disable ${active[0].label} for ${ctx.personLabel} (destination ${active[0].destination || 'unspecified'} preserved).`
            : `Disable ${active.length} forwarding variants for ${ctx.personLabel}. Destinations are preserved so they can be re-enabled later without re-typing.`,
        payload: {
          personId: ctx.personId,
          personLabel: ctx.personLabel,
          storeNum: ctx.storeNum,
          variantsToClear,
          before: perVariant,
        },
      },
    };
  },

  remediations: {
    async clear_call_forwarding(bot, data, requester) {
      const { personId, personLabel, storeNum, variantsToClear, before } = data;
      if (!Array.isArray(variantsToClear) || variantsToClear.length === 0) {
        await bot.say(
          'markdown',
          `⚠️ Forwarding remediation for **${personLabel}** had no variants to clear — nothing to do.`,
        );
        return;
      }

      logger(
        'voicediag:audit',
        `CONFIRMED clear_call_forwarding for ${personLabel} (person=${personId}, store=${storeNum}) ` +
        `by ${describeRequester(requester)} — variants=${variantsToClear.join(',')}, ` +
        `before=${JSON.stringify(before)}`,
      );

      try {
        const { default: webex } = await import('../../../integrations/webex/WebexClient.js');
        // Fetch fresh state to avoid stomping on a destination change
        // that happened between diagnose and remediate.
        const fresh = await webex.request('GET', ENDPOINT(personId));
        const cf = { ...(fresh?.callForwarding || {}) };
        for (const variant of variantsToClear) {
          cf[variant] = { ...(cf[variant] || {}), enabled: false };
        }
        await webex.request('PUT', ENDPOINT(personId), { callForwarding: cf });
      } catch (err) {
        logger(
          'voicediag:audit',
          `FAILED clear_call_forwarding for ${personLabel}: ${err.message}`,
          'error',
        );
        await bot.say(
          'markdown',
          `❌ Failed to clear call forwarding for **${personLabel}**: ${err.message}`,
        );
        return;
      }

      const humanList = variantsToClear
        .map((k) => VARIANTS.find((v) => v.key === k)?.label || k)
        .join(', ');
      await bot.say(
        'markdown',
        `✅ Cleared forwarding for **${personLabel}** (store ${storeNum}): ${humanList}. ` +
        `Destinations were preserved. Re-run \`/voicediag ${storeNum}\` to verify.`,
      );
      logger(
        'voicediag:audit',
        `COMPLETED clear_call_forwarding for ${personLabel} (store ${storeNum}) — variants=${variantsToClear.join(',')}`,
      );
    },
  },
};