import { getDb } from '../db/client.js'
import { ExtensionTimeoutAction } from '../constants.js'

const sql = getDb()

export const getAnonymityConfig = async () => {
  const [row] = await sql`SELECT value FROM app_config WHERE key = 'anonymity'`
  return { anonymity_enabled: row?.value?.enabled ?? false }
}

export const setAnonymityConfig = async (enabled) => {
  await sql`
    INSERT INTO app_config (key, value, updated_at)
    VALUES ('anonymity', ${sql.json({ enabled })}, NOW())
    ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
  `
  return { anonymity_enabled: enabled }
}

export const getMaxCustomersPerMitra = async () => {
  const [row] = await sql`SELECT value FROM app_config WHERE key = 'max_customers_per_mitra'`
  return { max_customers_per_mitra: row?.value?.value ?? 3 }
}

export const setMaxCustomersPerMitra = async (value) => {
  await sql`
    INSERT INTO app_config (key, value, updated_at)
    VALUES ('max_customers_per_mitra', ${sql.json({ value })}, NOW())
    ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
  `
  // Capacity changed → drop cached availability snapshot.
  // Imported lazily to avoid a circular import (mitra-status.service uses config).
  const { invalidateAvailabilityCache } = await import('./mitra-status.service.js')
  invalidateAvailabilityCache()
  return { max_customers_per_mitra: value }
}

// --- Phase 4: First-session discount config (back-compat shim) ---
//
// The canonical source of truth for the first-session discount lives in the
// `pricing_promotions` table (eligibility = 'first_session'). The CC settings
// page still calls `/internal/config/free-trial`, which exposes a slim
// {enabled, duration_minutes} view — kept as a back-compat shim until the CC
// UI is migrated to the richer /internal/config/first-session-discount handler.
// Reads and writes go directly against `pricing_promotions` so operator edits
// stay in sync with the customer-facing pricing payload.
//
// The legacy `first_session_discount_*` keys in `app_config` were retired in
// Stage 5 (deleted by migrate.js) — do NOT reintroduce them.

export const getFreeTrialConfig = async () => {
  const [row] = await sql`
    SELECT enabled, duration_minutes FROM pricing_promotions
    WHERE eligibility = 'first_session'
  `
  return {
    enabled: row?.enabled ?? true,
    duration_minutes: row?.duration_minutes ?? 12,
  }
}

export const setFreeTrialConfig = async ({ enabled, duration_minutes }) => {
  // Build a sparse UPDATE so undefined fields are left alone (matches the prior
  // semantics where missing patch fields were no-ops). Use COALESCE on each
  // column with the sentinel-when-undefined pattern; postgres.js parameterizes
  // null/undefined identically, so we branch on which fields the caller sent.
  if (enabled === undefined && duration_minutes === undefined) {
    return getFreeTrialConfig()
  }

  await sql`
    UPDATE pricing_promotions
    SET enabled          = ${enabled === undefined ? sql`enabled` : enabled},
        duration_minutes = ${duration_minutes === undefined ? sql`duration_minutes` : duration_minutes},
        updated_at       = NOW()
    WHERE eligibility = 'first_session'
  `
  return getFreeTrialConfig()
}

// --- Phase 4: Support handles ---

export const getSupportHandles = async () => {
  const [row] = await sql`SELECT value FROM app_config WHERE key = 'support_handles_json'`
  // Stored shape: { wa: {...}, telegram: {...} }. Fall back to a safe empty payload
  // so the client renders an empty Tanya Admin sheet rather than crashing.
  return row?.value ?? {
    wa: { label: 'WhatsApp', deeplink: '' },
    telegram: { label: 'Telegram', deeplink: '' },
  }
}

export const setSupportHandles = async ({ wa, telegram }) => {
  const current = await getSupportHandles()
  const next = {
    wa: { ...current.wa, ...(wa || {}) },
    telegram: { ...current.telegram, ...(telegram || {}) },
  }
  await sql`
    INSERT INTO app_config (key, value, updated_at)
    VALUES ('support_handles_json', ${sql.json(next)}, NOW())
    ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
  `
  return next
}

export const getExtensionTimeoutConfig = async () => {
  const [row] = await sql`SELECT value FROM app_config WHERE key = 'extension_timeout_seconds'`
  // Default 10s pairs with the auto-approve-on-timeout flow; raise this if you change the policy to auto-reject.
  return { extension_timeout_seconds: row?.value?.value ?? 10 }
}

export const setExtensionTimeoutConfig = async (seconds) => {
  await sql`
    INSERT INTO app_config (key, value, updated_at)
    VALUES ('extension_timeout_seconds', ${sql.json({ value: seconds })}, NOW())
    ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
  `
  return { extension_timeout_seconds: seconds }
}

export const getEarlyEndConfig = async () => {
  const [mitraRow] = await sql`SELECT value FROM app_config WHERE key = 'early_end_mitra_enabled'`
  const [customerRow] = await sql`SELECT value FROM app_config WHERE key = 'early_end_customer_enabled'`
  return {
    mitra_enabled: mitraRow?.value?.value ?? false,
    customer_enabled: customerRow?.value?.value ?? false,
  }
}

// --- Mitra reachability config ---
//
// Two separate concerns, deliberately decoupled:
//   - heartbeat_cadence_seconds: how often the mitra app sends a heartbeat.
//     Fixed per backend deployment via the MITRA_HEARTBEAT_CADENCE_SECONDS
//     env (default 30). The mitra app reads this from /api/mitra/status and
//     uses it directly as its Timer.periodic interval.
//   - stale_after_seconds: how long the backend tolerates silence before
//     marking a mitra offline. DB-stored, CC-tunable. Must be >= the
//     heartbeat cadence (CC PATCH validates this).
//
// `require_ping` stays as the master switch — when false, the auto-offline
// sweep is skipped entirely and mitras stay online forever once they toggle.

export const getMitraHeartbeatCadenceSeconds = () => {
  const raw = process.env.MITRA_HEARTBEAT_CADENCE_SECONDS
  if (!raw || raw.trim() === '') return 30
  const parsed = Number.parseInt(raw, 10)
  return Number.isFinite(parsed) && parsed >= 5 ? parsed : 30
}

export const getMitraPingConfig = async () => {
  const [requireRow] = await sql`SELECT value FROM app_config WHERE key = 'require_mitra_ping'`
  const [staleRow] = await sql`SELECT value FROM app_config WHERE key = 'mitra_stale_after_seconds'`
  return {
    require_ping: requireRow?.value?.value ?? true,
    stale_after_seconds: staleRow?.value?.value ?? 45,
    heartbeat_cadence_seconds: getMitraHeartbeatCadenceSeconds(),
  }
}

export const setMitraPingConfig = async ({ require_ping, stale_after_seconds }) => {
  if (require_ping !== undefined) {
    await sql`
      INSERT INTO app_config (key, value, updated_at)
      VALUES ('require_mitra_ping', ${sql.json({ value: require_ping })}, NOW())
      ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
    `
  }
  if (stale_after_seconds !== undefined) {
    await sql`
      INSERT INTO app_config (key, value, updated_at)
      VALUES ('mitra_stale_after_seconds', ${sql.json({ value: stale_after_seconds })}, NOW())
      ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
    `
  }
  return getMitraPingConfig()
}

export const setEarlyEndConfig = async ({ mitra_enabled, customer_enabled }) => {
  if (mitra_enabled !== undefined) {
    await sql`
      INSERT INTO app_config (key, value, updated_at)
      VALUES ('early_end_mitra_enabled', ${sql.json({ value: mitra_enabled })}, NOW())
      ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
    `
  }
  if (customer_enabled !== undefined) {
    await sql`
      INSERT INTO app_config (key, value, updated_at)
      VALUES ('early_end_customer_enabled', ${sql.json({ value: customer_enabled })}, NOW())
      ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
    `
  }
  return getEarlyEndConfig()
}

// --- Phase 3.3: Session Topic Sensitivity ---

export const getSensitivityConfig = async () => {
  const [confirmRow] = await sql`SELECT value FROM app_config WHERE key = 'sensitive_flip_confirmation_enabled'`
  const [latchRow] = await sql`SELECT value FROM app_config WHERE key = 'sensitive_flag_one_way_latch'`
  return {
    flip_confirmation_enabled: confirmRow?.value?.value ?? true,
    one_way_latch: latchRow?.value?.value ?? false,
  }
}

export const setSensitivityConfig = async ({ flip_confirmation_enabled, one_way_latch }) => {
  if (flip_confirmation_enabled !== undefined) {
    await sql`
      INSERT INTO app_config (key, value, updated_at)
      VALUES ('sensitive_flip_confirmation_enabled', ${sql.json({ value: flip_confirmation_enabled })}, NOW())
      ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
    `
  }
  if (one_way_latch !== undefined) {
    await sql`
      INSERT INTO app_config (key, value, updated_at)
      VALUES ('sensitive_flag_one_way_latch', ${sql.json({ value: one_way_latch })}, NOW())
      ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
    `
  }
  return getSensitivityConfig()
}

// --- Phase 3.4: Self-Managed Auth ---

export const getOtpRateLimits = async () => {
  const [phoneRow] = await sql`SELECT value FROM app_config WHERE key = 'otp_max_per_phone_per_hour'`
  const [ipRow] = await sql`SELECT value FROM app_config WHERE key = 'otp_max_per_ip_per_hour'`
  const [resendRow] = await sql`SELECT value FROM app_config WHERE key = 'otp_resend_cooldown_seconds'`
  const [attemptsRow] = await sql`SELECT value FROM app_config WHERE key = 'otp_verify_max_attempts'`
  return {
    max_per_phone_per_hour: phoneRow?.value?.value ?? 3,
    max_per_ip_per_hour: ipRow?.value?.value ?? 10,
    resend_cooldown_seconds: resendRow?.value?.value ?? 60,
    verify_max_attempts: attemptsRow?.value?.value ?? 5,
  }
}

export const setOtpRateLimits = async ({
  max_per_phone_per_hour,
  max_per_ip_per_hour,
  resend_cooldown_seconds,
  verify_max_attempts,
}) => {
  const pairs = [
    ['otp_max_per_phone_per_hour', max_per_phone_per_hour],
    ['otp_max_per_ip_per_hour', max_per_ip_per_hour],
    ['otp_resend_cooldown_seconds', resend_cooldown_seconds],
    ['otp_verify_max_attempts', verify_max_attempts],
  ]
  for (const [key, value] of pairs) {
    if (value === undefined) continue
    await sql`
      INSERT INTO app_config (key, value, updated_at)
      VALUES (${key}, ${sql.json({ value })}, NOW())
      ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
    `
  }
  return getOtpRateLimits()
}

export const getCcLoginLockoutConfig = async () => {
  const [attemptsRow] = await sql`SELECT value FROM app_config WHERE key = 'cc_login_max_attempts'`
  const [minutesRow] = await sql`SELECT value FROM app_config WHERE key = 'cc_login_lockout_minutes'`
  return {
    max_attempts: attemptsRow?.value?.value ?? 5,
    lockout_minutes: minutesRow?.value?.value ?? 15,
  }
}

export const setCcLoginLockoutConfig = async ({ max_attempts, lockout_minutes }) => {
  if (max_attempts !== undefined) {
    await sql`
      INSERT INTO app_config (key, value, updated_at)
      VALUES ('cc_login_max_attempts', ${sql.json({ value: max_attempts })}, NOW())
      ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
    `
  }
  if (lockout_minutes !== undefined) {
    await sql`
      INSERT INTO app_config (key, value, updated_at)
      VALUES ('cc_login_lockout_minutes', ${sql.json({ value: lockout_minutes })}, NOW())
      ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
    `
  }
  return getCcLoginLockoutConfig()
}

// --- Paid Pairing Flow + Returning-Chat + Extension Flip ---

export const getPaymentSessionTimeoutMinutes = async () => {
  const [row] = await sql`SELECT value FROM app_config WHERE key = 'payment_session_timeout_minutes'`
  return { payment_session_timeout_minutes: row?.value?.value ?? 20 }
}

export const setPaymentSessionTimeoutMinutes = async (value) => {
  await sql`
    INSERT INTO app_config (key, value, updated_at)
    VALUES ('payment_session_timeout_minutes', ${sql.json({ value })}, NOW())
    ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
  `
  return { payment_session_timeout_minutes: value }
}

export const getReturningChatConfirmationTimeoutSeconds = async () => {
  const [row] = await sql`SELECT value FROM app_config WHERE key = 'returning_chat_confirmation_timeout_seconds'`
  return { returning_chat_confirmation_timeout_seconds: row?.value?.value ?? 20 }
}

export const setReturningChatConfirmationTimeoutSeconds = async (value) => {
  await sql`
    INSERT INTO app_config (key, value, updated_at)
    VALUES ('returning_chat_confirmation_timeout_seconds', ${sql.json({ value })}, NOW())
    ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
  `
  return { returning_chat_confirmation_timeout_seconds: value }
}

export const getExtensionDefaultActionOnTimeout = async () => {
  const [row] = await sql`SELECT value FROM app_config WHERE key = 'extension_default_action_on_timeout'`
  return { extension_default_action_on_timeout: row?.value?.value ?? ExtensionTimeoutAction.AUTO_APPROVE }
}

export const setExtensionDefaultActionOnTimeout = async (value) => {
  await sql`
    INSERT INTO app_config (key, value, updated_at)
    VALUES ('extension_default_action_on_timeout', ${sql.json({ value })}, NOW())
    ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
  `
  return { extension_default_action_on_timeout: value }
}

export const getPairingBlastTimeoutSeconds = async () => {
  const [row] = await sql`SELECT value FROM app_config WHERE key = 'pairing_blast_timeout_seconds'`
  return { pairing_blast_timeout_seconds: row?.value?.value ?? 60 }
}

export const setPairingBlastTimeoutSeconds = async (value) => {
  await sql`
    INSERT INTO app_config (key, value, updated_at)
    VALUES ('pairing_blast_timeout_seconds', ${sql.json({ value })}, NOW())
    ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
  `
  return { pairing_blast_timeout_seconds: value }
}