/**
 * API envois planifiés / attente / envoi immédiat — placeholders jusqu’au branchement serveur.
 * Remplacer par fetch() vers vos routes (ex. POST /api/mail/scheduled, …).
 */

import type { Email } from "@/lib/email-data"

export type ScheduleSendPayload = {
  sendAtIso: string
  to: { name: string; email: string }[]
  subject: string
  previewText: string
  bodyHtml: string
}

let scheduledStore: Email[] = []
let snoozedStore: Email[] = []
let sentPlaceholderStore: Email[] = []

export function __resetScheduledMailPlaceholderStoreForTests() {
  scheduledStore = []
  snoozedStore = []
  sentPlaceholderStore = []
}

export async function listScheduledSends(): Promise<Email[]> {
  // TODO: fetch GET /api/mail/scheduled
  await Promise.resolve()
  return [...scheduledStore]
}

export async function listSnoozedSends(): Promise<Email[]> {
  // TODO: fetch GET /api/mail/snoozed
  await Promise.resolve()
  return [...snoozedStore]
}

export async function listSentPlaceholder(): Promise<Email[]> {
  // TODO: fusion avec réponse serveur « Envoyés »
  await Promise.resolve()
  return [...sentPlaceholderStore]
}

export async function createScheduledSend(
  payload: ScheduleSendPayload
): Promise<{ id: string }> {
  // TODO: POST /api/mail/scheduled
  await Promise.resolve()
  const id = `sched-${Date.now()}-${Math.random().toString(36).slice(2, 7)}`
  const first = payload.to[0]
  const toName = first?.name?.trim() || first?.email || "Destinataire"
  const row: Email = {
    id,
    sender: toName,
    senderEmail: first?.email,
    subject: payload.subject.trim() || "(Sans objet)",
    preview: payload.previewText.slice(0, 200),
    body: payload.bodyHtml,
    date: payload.sendAtIso,
    read: true,
    starred: false,
    important: false,
    labels: ["scheduled"],
    scheduledSendAt: payload.sendAtIso,
    scheduledToName: toName,
  }
  scheduledStore = [row, ...scheduledStore.filter((e) => e.id !== id)]
  return { id }
}

export async function deleteScheduledSend(id: string): Promise<void> {
  // TODO: DELETE /api/mail/scheduled/:id
  await Promise.resolve()
  scheduledStore = scheduledStore.filter((e) => e.id !== id)
}

export async function archiveScheduledSend(id: string): Promise<void> {
  // TODO: POST /api/mail/scheduled/:id/archive
  await Promise.resolve()
  scheduledStore = scheduledStore.filter((e) => e.id !== id)
}

/** Retire de « planifié » et place dans « En attente » (snooze). */
export async function snoozeScheduledSend(id: string): Promise<void> {
  // TODO: POST /api/mail/scheduled/:id/snooze
  await Promise.resolve()
  const i = scheduledStore.findIndex((e) => e.id === id)
  if (i === -1) return
  const row = scheduledStore[i]!
  scheduledStore = scheduledStore.filter((e) => e.id !== id)
  const wake = new Date(Date.now() + 24 * 60 * 60 * 1000)
  const wakeIso = wake.toISOString()
  snoozedStore.unshift({
    ...row,
    labels: ["snoozed"],
    scheduledSendAt: undefined,
    scheduledToName: undefined,
    snoozeWakeAt: wakeIso,
    sender: row.scheduledToName ?? row.sender,
    read: true,
  })
}

export async function rescheduleScheduledSend(
  id: string,
  sendAtIso: string
): Promise<void> {
  // TODO: PATCH /api/mail/scheduled/:id { sendAt }
  await Promise.resolve()
  const idx = scheduledStore.findIndex((e) => e.id === id)
  if (idx === -1) return
  scheduledStore[idx] = {
    ...scheduledStore[idx]!,
    scheduledSendAt: sendAtIso,
  }
}

function rowToSchedulePayload(row: Email): ScheduleSendPayload {
  const email = row.senderEmail?.trim() ?? ""
  const name = row.scheduledToName ?? row.sender
  return {
    sendAtIso: row.scheduledSendAt ?? new Date().toISOString(),
    to: email ? [{ name: name, email }] : [],
    subject: row.subject,
    previewText: row.preview,
    bodyHtml: row.body ?? `<p></p>`,
  }
}

/** Lecture seule pour ouvrir le compose sans retirer de la liste « Planifié ». */
export async function getScheduledSendPayloadForEdit(
  id: string
): Promise<ScheduleSendPayload | null> {
  // TODO: GET /api/mail/scheduled/:id/edit
  await Promise.resolve()
  const row = scheduledStore.find((e) => e.id === id)
  if (!row) return null
  return rowToSchedulePayload(row)
}

/** Met à jour contenu + date d’envoi pour un id planifié existant. */
export async function updateScheduledSend(
  id: string,
  payload: ScheduleSendPayload
): Promise<void> {
  // TODO: PUT /api/mail/scheduled/:id
  await Promise.resolve()
  const idx = scheduledStore.findIndex((e) => e.id === id)
  if (idx === -1) return
  const row = scheduledStore[idx]!
  const first = payload.to[0]
  const toName = first?.name?.trim() || first?.email || "Destinataire"
  scheduledStore[idx] = {
    ...row,
    sender: toName,
    senderEmail: first?.email,
    subject: payload.subject.trim() || "(Sans objet)",
    preview: payload.previewText.slice(0, 200),
    body: payload.bodyHtml,
    scheduledSendAt: payload.sendAtIso,
    scheduledToName: toName,
  }
}

/** Retire le planifié et renvoie le contenu (ex. flux legacy). */
export async function popScheduledSendForEdit(
  id: string
): Promise<ScheduleSendPayload | null> {
  // TODO: POST /api/mail/scheduled/:id/edit-session
  await Promise.resolve()
  const i = scheduledStore.findIndex((e) => e.id === id)
  if (i === -1) return null
  const row = scheduledStore[i]!
  scheduledStore = scheduledStore.filter((e) => e.id !== id)
  return rowToSchedulePayload(row)
}

export async function sendScheduledNow(id: string): Promise<void> {
  // TODO: POST /api/mail/scheduled/:id/send-now
  await Promise.resolve()
  const i = scheduledStore.findIndex((e) => e.id === id)
  if (i === -1) return
  const row = scheduledStore[i]!
  scheduledStore = scheduledStore.filter((e) => e.id !== id)
  const now = new Date()
  sentPlaceholderStore.unshift({
    id: `sent-now-${Date.now()}-${Math.random().toString(36).slice(2, 5)}`,
    sender: row.scheduledToName ?? row.sender,
    senderEmail: row.senderEmail,
    subject: row.subject,
    preview: row.preview,
    body: row.body,
    date: now.toISOString(),
    read: true,
    starred: false,
    important: false,
    labels: ["sent"],
  })
}

export async function markScheduledSendReadState(
  id: string,
  read: boolean
): Promise<void> {
  // TODO: PATCH
  await Promise.resolve()
  const i = scheduledStore.findIndex((e) => e.id === id)
  if (i === -1) return
  scheduledStore[i] = { ...scheduledStore[i]!, read }
}