import { NextRequest, NextResponse } from 'next/server'
import prisma from '@/lib/prisma'
import { getMobileUserId } from '@/lib/mobile-auth'

function getTodayKey(): string {
  return new Date().toISOString().slice(0, 10) // YYYY-MM-DD — clé de recherche interne
}

function getTodayTitle(): string {
  return new Date().toLocaleDateString('fr-FR', {
    weekday: 'long', year: 'numeric', month: 'long', day: 'numeric',
  })
  // ex : "vendredi 29 mai 2026"
}

function getTodayContent(title: string): string {
  // HTML simple lisible par la WebView mobile
  return `<h1>📅 ${title}</h1><p></p>`
}

export async function GET(req: NextRequest) {
  const userId = getMobileUserId(req)
  if (!userId) return NextResponse.json({ error: 'Non autorisé' }, { status: 401 })

  const todayKey = getTodayKey()
  const todayTitle = getTodayTitle()

  // Chercher par clé ISO (titre interne) ou par titre lisible (migration)
  let note = await prisma.note.findFirst({
    where: {
      userId,
      type: 'daily',
      trashedAt: null,
      title: { in: [todayKey, todayTitle] },
    },
  })

  if (!note) {
    note = await prisma.note.create({
      data: {
        userId,
        title: todayTitle,
        content: getTodayContent(todayTitle),
        type: 'daily',
        color: '#FEF9C3',
        labels: JSON.stringify(['daily']),
      },
    })
  } else if (note.title === todayKey) {
    // Migrer l'ancien titre ISO → titre lisible
    const htmlContent = getTodayContent(todayTitle)
    note = await prisma.note.update({
      where: { id: note.id },
      data: { title: todayTitle, content: htmlContent },
    })
  }

  return NextResponse.json({ id: note.id, note })
}