// src/commands/voiceDiag.js
//
// /voicediag <storeNum> [detail] [--only id1,id2]
// /voicediag list-checks
//
// Thin orchestrator around services/voiceDiag/voiceDiagService.js. This
// handler:
//
//   1. Parses args (or query params on the HTTP path).
//   2. Runs `buildContext(storeNum)` + `runVoiceDiag(ctx, opts)`.
//   3. Renders the results via voiceDiagRenderer.
//   4. For every fixable result, posts a per-issue confirmation card
//      through the same "pending map + one-shot dispatch" pattern used
//      by /webexhost, /offboarduser, and the IGMP-fix inline card.
//
// The remediation dispatch (`applyVoiceDiagRemediation` /
// `cancelVoiceDiagRemediation`) is called from index.js after the
// `attachmentAction` router matches `confirm_voicediag` /
// `cancel_voicediag`. Each pending card entry carries its
// `remediationId`, which we look up in a registry built from every
// check's `remediations` export. Adding a new check with a new
// remediation therefore requires zero changes to index.js — the
// action namespace routes through this single dispatcher.

import { randomUUID } from 'node:crypto';
import { logger } from '../utils/logger.js';
import { extractRequester, describeRequester } from '../utils/requester.js';
import { pendingVoiceFixes } from '../utils/pendingVoiceFixes.js';
import { renderVoiceDiagMarkdown } from '../services/renderers/voiceDiagRenderer.js';
import {
  buildContext,
  runVoiceDiag,
  buildRemediationRegistry,
  CHECKS,
} from '../services/voiceDiag/voiceDiagService.js';

// Built once at module load. `buildRemediationRegistry` throws on
// duplicate action ids, so any collision surfaces at import time —
// which is exactly what we want.
const REMEDIATION_REGISTRY = buildRemediationRegistry();

export async function handleVoiceDiag(bot, trigger) {
  logger('voicediag', 'Handler entered', 'debug');

  const query = trigger.query || {};
  // Normalise Unicode dashes → ASCII `--`. macOS auto-correct silently
  // turns `--detailed` into `—detailed` when typed inline in Webex,
  // and the framework passes the arg through verbatim. Do the same
  // for a run of consecutive hyphens (`---detailed` → `--detailed`).
  const args = (trigger.args || []).map(normalizeArg);

  // Special-case a discovery / debug mode.
  if ((args[0] || query.mode || '').toString().toLowerCase() === 'list-checks') {
    await bot.say('markdown', renderListChecks());
    return;
  }

  let storeNum = args[0]?.trim() || query.storeNum || query.store || query.s;

  // Accept every reasonable variant so the footer hint ("pass
  // `detailed`") and the /phonestatus muscle memory ("`detailed`" as
  // the second positional) both work, alongside the flag forms
  // (`--detail`, `--detailed`) and the `?detailed=true` query param.
  const detailed = argIncludes(args, 'detail')
    || argIncludes(args, 'detailed')
    || argIncludes(args, '--detail')
    || argIncludes(args, '--detailed')
    || query.mode === 'detailed'
    || query.detailed === 'true'
    || query.detailed === true;

  const onlyRaw = pickOnlyArg(args) ?? query.only ?? '';
  const only = String(onlyRaw)
    .split(',')
    .map((s) => s.trim())
    .filter(Boolean);

  // Look-back window for WAN checks (healthscore + LQM + alarms).
  // Accepts `15m`, `1h`, `24h`, `1d` etc. Defaults to whatever
  // `buildContext` resolves via env WAN_STANDARD_WINDOW_MINUTES.
  const windowRaw = pickWindowArg(args) ?? query.window ?? null;
  const windowMinutes = parseWindowMinutes(windowRaw);
  if (windowRaw && windowMinutes == null) {
    await bot.say(
      'markdown',
      `Unrecognised window \`${windowRaw}\`. Use \`15m\`, \`1h\`, \`6h\`, \`24h\`, or \`1d\`.`,
    );
    return;
  }

  if (!storeNum || !/^\d{2,4}$/.test(storeNum)) {
    await bot.say(
      'markdown',
      'Please provide a 2–4 digit store number.\n' +
      'Examples:\n' +
      '- `/voicediag 782`\n' +
      '- `/voicediag 782 detailed`\n' +
      '- `/voicediag 782 --window 24h`\n' +
      '- `/voicediag 782 --only dnd,callForwarding`\n' +
      '- `/voicediag list-checks`',
    );
    return;
  }

  let ctx;
  try {
    ctx = await buildContext(storeNum, { windowMinutes });
  } catch (err) {
    logger('voicediag', `buildContext failed for store ${storeNum}: ${err.message}`, 'error');
    await bot.say('markdown', `❌ Failed to build diagnostic context for store ${storeNum}: ${err.message}`);
    return;
  }

  if (!ctx.personId) {
    await bot.say(
      'markdown',
      `❌ Could not resolve a Webex user for store ${storeNum} (expected \`${ctx.email}\`). ` +
      `Verify the store number is correct.`,
    );
    return;
  }

  let results;
  try {
    results = await runVoiceDiag(ctx, { only });
  } catch (err) {
    // runVoiceDiag should never throw (each check is isolated), but
    // guard anyway so a runner-level bug surfaces to the operator.
    logger('voicediag', `runVoiceDiag threw for store ${storeNum}: ${err.message}`, 'error');
    await bot.say('markdown', `❌ Diagnostic run failed for store ${storeNum}: ${err.message}`);
    return;
  }

  const reply = renderVoiceDiagMarkdown(results, {
    storeNum: ctx.storeNum,
    personLabel: ctx.personLabel,
    email: ctx.email,
    detailed,
    wanWindowMinutes: ctx.sdwanData?.window?.minutes ?? null,
  });
  await bot.say('markdown', reply || 'No diagnostic results.');

  // Adaptive-card remediation is chat-only. HTTP callers get the
  // markdown snapshot but no interactive cards (same rule the
  // /phonestatus + IGMP-fix inline card follows). `trigger.person`
  // is populated for chat, absent for the HTTP fake trigger.
  if (!trigger.person) return;

  const requester = extractRequester(trigger);
  const fixable = results.filter((r) => r.status !== 'ok' && r.remediation);
  for (const result of fixable) {
    await postRemediationCard(bot, {
      storeNum: ctx.storeNum,
      result,
      requester,
    });
  }

  // If there are 2+ independent remediations, add a bulk "apply all"
  // card as a shortcut. The individual cards remain on-screen so an
  // operator who only wants to fix one thing can still do that; the
  // combined card just spares them from N confirm clicks when the
  // whole set looks fine. Single-remediation cases skip this — one
  // card is already the minimum interaction.
  if (fixable.length >= 2) {
    await postCombinedRemediationCard(bot, {
      storeNum: ctx.storeNum,
      fixable,
      requester,
    });
  }
}

/**
 * apply / cancel dispatchers — invoked from index.js after the
 * attachmentAction router matches `confirm_voicediag` /
 * `cancel_voicediag`.
 *
 * The pending payload (see pendingVoiceFixes) always carries a
 * `remediationId` and `remediationPayload`. `remediationId` looks up
 * the check that owns the action + its handler in REMEDIATION_REGISTRY.
 */
export async function applyVoiceDiagRemediation(bot, data, _roomId, requester) {
  const entry = REMEDIATION_REGISTRY.get(data?.remediationId);
  if (!entry) {
    logger(
      'voicediag:action',
      `No handler registered for remediationId "${data?.remediationId}" — ignoring`,
      'warn',
    );
    await bot.say(
      'markdown',
      `⚠️ No handler is registered for remediation \`${data?.remediationId || 'unknown'}\`. ` +
      `This card may have been created by an older build of the bot.`,
    );
    return;
  }

  logger(
    'voicediag:audit',
    `Dispatching ${data.remediationId} for store ${data?.storeNum} ` +
    `(check=${entry.check.id}) requested by ${describeRequester(requester)}`,
  );

  await entry.handler(bot, data.remediationPayload || {}, requester);
}

export async function cancelVoiceDiagRemediation(bot, data, _roomId, requester) {
  const { storeNum, remediationId, personLabel } = data || {};
  await bot.say(
    'markdown',
    `❌ Cancelled \`${remediationId || 'voicediag'}\` for **${personLabel || `store ${storeNum || '?'}`}**. No changes were made.`,
  );
  logger(
    'voicediag:audit',
    `CANCELLED ${remediationId || 'unknown'} for store ${storeNum || '?'} ` +
    `by ${describeRequester(requester)}`,
  );
}

/**
 * Combined "apply all N fixes" dispatcher — invoked when an operator
 * clicks the bulk confirm on the summary card posted after 2+
 * individually-fixable results. Iterates the queued entries in
 * *sequence* rather than parallel:
 *
 *   - Sequential keeps Webex-side audit lines readable (one
 *     "COMPLETED foo" line per fix, in the order the check ran).
 *   - Sequential avoids compounding rate-limit exposure on the
 *     `/v1/people/{id}/features/*` surface (Webex applies a
 *     per-person write throttle that we've hit in bursts before).
 *   - Individual failure isolation: one 500 doesn't abort the rest;
 *     failures accumulate into `errors[]` and get reported at the end.
 */
export async function applyAllVoiceDiagRemediations(bot, data, _roomId, requester) {
  const entries = Array.isArray(data?.entries) ? data.entries : [];
  const { storeNum, personLabel } = data || {};

  if (entries.length === 0) {
    await bot.say(
      'markdown',
      `⚠️ No pending remediations to apply for store ${storeNum || '?'}. The card may have expired.`,
    );
    return;
  }

  logger(
    'voicediag:audit',
    `Dispatching APPLY-ALL (${entries.length} fixes) for store ${storeNum} ` +
    `requested by ${describeRequester(requester)}`,
  );

  const applied = [];
  const errors = [];

  for (const entry of entries) {
    const registered = REMEDIATION_REGISTRY.get(entry.remediationId);
    if (!registered) {
      errors.push({ id: entry.remediationId, reason: 'no handler registered' });
      logger(
        'voicediag:action',
        `No handler registered for remediationId "${entry.remediationId}" in apply-all — skipping`,
        'warn',
      );
      continue;
    }

    try {
      logger(
        'voicediag:audit',
        `apply-all → ${entry.remediationId} (check=${registered.check.id}) for store ${storeNum}`,
      );
      await registered.handler(bot, entry.remediationPayload || {}, requester);
      applied.push(entry.remediationId);
    } catch (err) {
      errors.push({ id: entry.remediationId, reason: err.message });
      logger(
        'voicediag:action',
        `apply-all: ${entry.remediationId} failed: ${err.message}`,
        'error',
      );
    }
  }

  // Post a final summary line so the operator sees the aggregate
  // outcome in one place — individual handlers already posted their
  // own ✅ / ❌ per-fix, but a final tally scannable in one glance
  // is much friendlier than reading N separate lines.
  const lines = [
    `**Apply-all complete for store ${storeNum}** (${personLabel || 'store user'})`,
    `- Applied: ${applied.length} / ${entries.length}`,
  ];
  if (errors.length > 0) {
    lines.push(`- Failed: ${errors.length}`);
    for (const e of errors) {
      lines.push(`  - \`${e.id}\` — ${e.reason}`);
    }
    lines.push(`Re-run \`/voicediag ${storeNum}\` to re-inspect and retry any leftovers.`);
  }
  await bot.say('markdown', lines.join('\n'));

  logger(
    'voicediag:audit',
    `COMPLETED apply-all for store ${storeNum} — applied=${applied.length}/${entries.length}, ` +
    `errors=${errors.length}`,
  );
}

export async function cancelAllVoiceDiagRemediations(bot, data, _roomId, requester) {
  const { storeNum, personLabel } = data || {};
  const entries = Array.isArray(data?.entries) ? data.entries : [];
  await bot.say(
    'markdown',
    `❌ Cancelled all pending remediations for **${personLabel || `store ${storeNum || '?'}`}** ` +
    `(${entries.length} fix${entries.length === 1 ? '' : 'es'} not applied).`,
  );
  logger(
    'voicediag:audit',
    `CANCELLED APPLY-ALL (${entries.length} entries) for store ${storeNum || '?'} ` +
    `by ${describeRequester(requester)}`,
  );
}

// ─── internals ────────────────────────────────────────────────────

function argIncludes(args, needle) {
  const n = String(needle).toLowerCase();
  return args.some((a) => String(a).toLowerCase() === n);
}

// Coerce macOS-style smart-dashes back to plain ASCII hyphens so
// `—detailed` (em-dash), `–detailed` (en-dash), and `---detailed`
// all end up matching `--detailed`. Applied per-arg before any
// other parsing. Exported for unit tests.
export function normalizeArg(raw) {
  if (raw === null || raw === undefined) return raw;
  return String(raw)
    .replace(/[\u2010-\u2015\u2212]/g, '--')  // hyphens/dashes/minus → --
    .replace(/^-{3,}/, '--');                  // collapse ---+ to --
}

// Supports both `--only=dnd,callWaiting` and `--only dnd,callWaiting`
// (i.e. the value is the token immediately after `--only`).
function pickOnlyArg(args) {
  return pickFlagValue(args, '--only');
}

function pickWindowArg(args) {
  return pickFlagValue(args, '--window');
}

// Generic `--flag=value` / `--flag value` extractor.
function pickFlagValue(args, flag) {
  const prefix = `${flag.toLowerCase()}=`;
  for (let i = 0; i < args.length; i += 1) {
    const a = String(args[i] || '').toLowerCase();
    if (a.startsWith(prefix)) return String(args[i]).slice(prefix.length);
    if (a === flag.toLowerCase() && i + 1 < args.length) return args[i + 1];
  }
  return null;
}

/**
 * Parse a window shorthand (`15m`, `1h`, `24h`, `1d`, `1440`) into
 * minutes. Returns null on unrecognised input so the caller can
 * decide whether to surface a friendly error or fall back to the
 * env default.
 */
export function parseWindowMinutes(raw) {
  if (raw === null || raw === undefined || raw === '') return undefined;
  const s = String(raw).trim().toLowerCase();
  // Bare integer → treat as minutes.
  if (/^\d+$/.test(s)) return Math.max(1, parseInt(s, 10));
  const m = s.match(/^(\d+)\s*(m|min|mins|h|hr|hrs|hour|hours|d|day|days)$/);
  if (!m) return null;
  const n = parseInt(m[1], 10);
  const unit = m[2];
  if (['m', 'min', 'mins'].includes(unit)) return n;
  if (['h', 'hr', 'hrs', 'hour', 'hours'].includes(unit)) return n * 60;
  if (['d', 'day', 'days'].includes(unit)) return n * 60 * 24;
  return null;
}

function renderListChecks() {
  let md = '**/voicediag registered checks**\n\n';
  for (const c of CHECKS) {
    const rems = c.remediations ? Object.keys(c.remediations) : [];
    md += `- **${c.id}** — ${c.label}\n`;
    md += `  - Requires: ${(c.requires || []).join(', ') || 'none'}\n`;
    md += `  - Scope: \`${c.scope || 'unspecified'}\`\n`;
    if (rems.length > 0) {
      md += `  - Remediations: ${rems.map((r) => `\`${r}\``).join(', ')}\n`;
    }
  }
  return md;
}

/**
 * Registers a pending remediation payload and posts the adaptive
 * card. All cards share the same `confirm_voicediag` /
 * `cancel_voicediag` action namespace — the specific remediation is
 * carried by `data.remediationId` inside the pending map entry.
 */
async function postRemediationCard(bot, { storeNum, result, requester }) {
  const cardId = randomUUID();
  const { remediation } = result;

  pendingVoiceFixes.set(cardId, {
    storeNum,
    personId: remediation.payload?.personId || null,
    personLabel: remediation.payload?.personLabel || null,
    requester,
    remediationId: remediation.action,
    remediationPayload: remediation.payload || {},
  });

  const card = buildVoiceDiagCard({
    storeNum,
    result,
    cardId,
  });

  await bot.say({
    markdown: `Remediation available for **${result.label}** — review and confirm:`,
    attachments: [{
      contentType: 'application/vnd.microsoft.card.adaptive',
      content: card,
    }],
  });
}

/**
 * Registers a *combined* pending payload holding every fixable
 * result's remediationId + payload, and posts one adaptive card
 * offering to apply the whole batch in a single click. Shape of the
 * stored payload:
 *
 *   {
 *     combined: true,
 *     storeNum, personLabel,
 *     entries: [{ remediationId, remediationPayload }, ...],
 *     requester,
 *   }
 *
 * Uses the same pendingVoiceFixes map (single sweep, single TTL) —
 * the `combined: true` flag + the dispatcher's `switch` on
 * `actionType` are what decides whether to hit the single-fix or
 * batch handler.
 */
async function postCombinedRemediationCard(bot, { storeNum, fixable, requester }) {
  const cardId = randomUUID();
  // All fixable results in a run share the same person (they're
  // per-user features on the store line), so grab the label from
  // the first entry — safer than reaching for ctx here since this
  // helper only receives what it needs.
  const personLabel =
    fixable.find((r) => r.remediation?.payload?.personLabel)?.remediation?.payload?.personLabel ||
    `store ${storeNum}`;

  const entries = fixable.map((r) => ({
    remediationId: r.remediation.action,
    remediationPayload: r.remediation.payload || {},
    // Kept for the card summary + audit context. Not read by the
    // dispatcher.
    label: r.label,
    title: r.remediation.title,
  }));

  pendingVoiceFixes.set(cardId, {
    combined: true,
    storeNum,
    personLabel,
    requester,
    entries,
  });

  const card = buildCombinedVoiceDiagCard({
    storeNum,
    personLabel,
    entries,
    cardId,
  });

  await bot.say({
    markdown: `Or apply **all ${entries.length} fixes** at once:`,
    attachments: [{
      contentType: 'application/vnd.microsoft.card.adaptive',
      content: card,
    }],
  });
}

function buildVoiceDiagCard({ storeNum, result, cardId }) {
  const { label, message, remediation } = result;
  return {
    type: 'AdaptiveCard',
    $schema: 'http://adaptivecards.io/schemas/adaptive-card.json',
    version: '1.3',
    body: [
      {
        type: 'TextBlock',
        size: 'Medium',
        weight: 'Bolder',
        text: `${label} — Store ${storeNum}`,
        wrap: true,
      },
      {
        type: 'TextBlock',
        text: message,
        wrap: true,
        spacing: 'Small',
      },
      {
        type: 'TextBlock',
        text: remediation.summary || remediation.title,
        wrap: true,
        spacing: 'Small',
        isSubtle: true,
      },
    ],
    actions: [
      {
        type: 'Action.Submit',
        title: `✅ ${remediation.title}`,
        data: { action: 'confirm_voicediag', cardId },
      },
      {
        type: 'Action.Submit',
        title: '❌ Cancel',
        data: { action: 'cancel_voicediag', cardId },
      },
    ],
  };
}

function buildCombinedVoiceDiagCard({ storeNum, personLabel, entries, cardId }) {
  const bulletBody = entries.map((e) => `• ${e.label}: ${e.title}`).join('\n');
  return {
    type: 'AdaptiveCard',
    $schema: 'http://adaptivecards.io/schemas/adaptive-card.json',
    version: '1.3',
    body: [
      {
        type: 'TextBlock',
        size: 'Medium',
        weight: 'Bolder',
        text: `Apply all ${entries.length} fixes — Store ${storeNum}`,
        wrap: true,
      },
      {
        type: 'TextBlock',
        text: `Target: ${personLabel}`,
        wrap: true,
        spacing: 'Small',
        isSubtle: true,
      },
      {
        type: 'TextBlock',
        text: bulletBody,
        wrap: true,
        spacing: 'Small',
      },
      {
        type: 'TextBlock',
        text: 'Fixes will be applied in sequence. Any failures are reported at the end.',
        wrap: true,
        spacing: 'Small',
        isSubtle: true,
      },
    ],
    actions: [
      {
        type: 'Action.Submit',
        title: `✅ Apply all ${entries.length}`,
        data: { action: 'confirm_voicediag_all', cardId },
      },
      {
        type: 'Action.Submit',
        title: '❌ Cancel',
        data: { action: 'cancel_voicediag_all', cardId },
      },
    ],
  };
}