import { NextResponse } from 'next/server'
import { auth } from '@/auth'
import prisma from '@/lib/prisma'

function getTodayTitle(): string {
  return new Date().toISOString().slice(0, 10) // YYYY-MM-DD
}

function getTodayContent(dateStr: string): string {
  const d = new Date(dateStr)
  const options: Intl.DateTimeFormatOptions = {
    weekday: 'long',
    year: 'numeric',
    month: 'long',
    day: 'numeric',
  }
  const formatted = d.toLocaleDateString('fr-FR', options)
  return JSON.stringify({
    type: 'doc',
    content: [
      { type: 'heading', attrs: { level: 1 }, content: [{ type: 'text', text: `📅 ${formatted}` }] },
      { type: 'paragraph', content: [{ type: 'text', text: '' }] },
    ],
  })
}

/**
 * GET /api/notes/daily
 * Returns (or creates) today's daily note for the authenticated user.
 */
export async function GET() {
  const session = await auth()
  if (!session?.user?.id) {
    return NextResponse.json({ success: false, error: 'Unauthorized' }, { status: 401 })
  }

  const today = getTodayTitle()
  const userId = session.user.id

  // Try to find existing daily note for today
  let note = await prisma.note.findFirst({
    where: {
      userId,
      title: today,
      type: 'daily',
      trashedAt: null,
    },
  })

  if (!note) {
    note = await prisma.note.create({
      data: {
        userId,
        title: today,
        content: getTodayContent(today),
        type: 'daily',
        color: '#FEF9C3', // yellow-100 — distinguishes daily notes visually
        labels: JSON.stringify(['daily']),
      },
    })
  }

  return NextResponse.json({ success: true, note })
}