import { NextRequest, NextResponse } from 'next/server'
import { auth } from '@/auth'
import { prisma } from '@/lib/prisma'
import { MAX_PROPERTIES_PER_NOTEBOOK } from '@/lib/structured-views/types'
import { isValidPropertyType } from '@/lib/structured-views/property-utils'
import { buildNoteValuesMap, parseViewSettings, serializeSchema } from '@/lib/structured-views/schema-serialize'

async function assertNotebookAccess(notebookId: string, userId: string) {
  return prisma.notebook.findFirst({
    where: { id: notebookId, userId, trashedAt: null },
    select: { id: true },
  })
}

const schemaInclude = {
  properties: { orderBy: { position: 'asc' as const } },
} as const

export async function GET(
  _request: NextRequest,
  { params }: { params: Promise<{ id: string }> },
) {
  const session = await auth()
  if (!session?.user?.id) {
    return NextResponse.json({ success: false, error: 'Unauthorized' }, { status: 401 })
  }

  try {
    const { id: notebookId } = await params
    const notebook = await assertNotebookAccess(notebookId, session.user.id)
    if (!notebook) {
      return NextResponse.json({ success: false, error: 'Notebook not found' }, { status: 404 })
    }

    const raw = await prisma.notebookSchema.findUnique({
      where: { notebookId },
      include: schemaInclude,
    })

    const schema = serializeSchema(raw)
    if (!schema) {
      return NextResponse.json({ success: true, data: { schema: null, noteValues: {} } })
    }

    const notes = await prisma.note.findMany({
      where: { notebookId, userId: session.user.id, trashedAt: null },
      select: { id: true },
    })
    const noteIds = notes.map((n) => n.id)

    const rows = noteIds.length
      ? await prisma.noteProperty.findMany({
          where: { noteId: { in: noteIds } },
          include: { property: { select: { type: true } } },
        })
      : []

    const noteValues = buildNoteValuesMap(noteIds, rows)

    return NextResponse.json({ success: true, data: { schema, noteValues } })
  } catch (error) {
    console.error('GET notebook schema:', error)
    return NextResponse.json({ success: false, error: 'Failed to load schema' }, { status: 500 })
  }
}

export async function POST(
  _request: NextRequest,
  { params }: { params: Promise<{ id: string }> },
) {
  const session = await auth()
  if (!session?.user?.id) {
    return NextResponse.json({ success: false, error: 'Unauthorized' }, { status: 401 })
  }

  try {
    const { id: notebookId } = await params
    const notebook = await assertNotebookAccess(notebookId, session.user.id)
    if (!notebook) {
      return NextResponse.json({ success: false, error: 'Notebook not found' }, { status: 404 })
    }

    const existing = await prisma.notebookSchema.findUnique({ where: { notebookId } })
    if (existing) {
      const raw = await prisma.notebookSchema.findUnique({
        where: { notebookId },
        include: schemaInclude,
      })
      return NextResponse.json({ success: true, data: { schema: serializeSchema(raw) } })
    }

    const created = await prisma.notebookSchema.create({
      data: { notebookId },
      include: schemaInclude,
    })

    return NextResponse.json({ success: true, data: { schema: serializeSchema(created) } })
  } catch (error) {
    console.error('POST notebook schema:', error)
    return NextResponse.json({ success: false, error: 'Failed to create schema' }, { status: 500 })
  }
}

export async function PATCH(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> },
) {
  const session = await auth()
  if (!session?.user?.id) {
    return NextResponse.json({ success: false, error: 'Unauthorized' }, { status: 401 })
  }

  try {
    const { id: notebookId } = await params
    const notebook = await assertNotebookAccess(notebookId, session.user.id)
    if (!notebook) {
      return NextResponse.json({ success: false, error: 'Notebook not found' }, { status: 404 })
    }

    const body = await request.json()
    const action = typeof body.action === 'string' ? body.action : ''

    let schema = await prisma.notebookSchema.findUnique({ where: { notebookId } })
    if (!schema) {
      schema = await prisma.notebookSchema.create({ data: { notebookId } })
    }

    if (action === 'addProperty') {
      const name = typeof body.name === 'string' ? body.name.trim() : ''
      const type = typeof body.type === 'string' ? body.type : ''
      if (!name || !isValidPropertyType(type)) {
        return NextResponse.json({ success: false, error: 'Invalid property' }, { status: 400 })
      }

      const count = await prisma.notebookProperty.count({ where: { schemaId: schema.id } })
      if (count >= MAX_PROPERTIES_PER_NOTEBOOK) {
        return NextResponse.json({ success: false, error: 'Max properties reached' }, { status: 400 })
      }

      let options: string[] = []
      if (type === 'select' || type === 'multiselect') {
        options = Array.isArray(body.options)
          ? body.options
              .filter((o: unknown): o is string => typeof o === 'string' && o.trim().length > 0)
              .map((o: string) => o.trim())
          : []
        if (options.length === 0) {
          return NextResponse.json({ success: false, error: 'Options required' }, { status: 400 })
        }
      }

      await prisma.notebookProperty.create({
        data: {
          schemaId: schema.id,
          name,
          type,
          options: options.length ? JSON.stringify(options) : null,
          position: count,
        },
      })
    } else if (action === 'deleteProperty') {
      const propertyId = typeof body.propertyId === 'string' ? body.propertyId : ''
      if (!propertyId) {
        return NextResponse.json({ success: false, error: 'propertyId required' }, { status: 400 })
      }
      const currentSettings = parseViewSettings(schema.viewSettings)
      await prisma.notebookProperty.deleteMany({
        where: { id: propertyId, schemaId: schema.id },
      })
      if (currentSettings.kanbanGroupPropertyId === propertyId) {
        await prisma.notebookSchema.update({
          where: { id: schema.id },
          data: { viewSettings: JSON.stringify({ ...currentSettings, kanbanGroupPropertyId: null }) },
        })
      }
    } else if (action === 'updateViewSettings') {
      const current = parseViewSettings(schema.viewSettings)
      const next: Record<string, unknown> = { ...current }
      if ('kanbanGroupPropertyId' in body) {
        next.kanbanGroupPropertyId =
          typeof body.kanbanGroupPropertyId === 'string' ? body.kanbanGroupPropertyId : null
      }
      await prisma.notebookSchema.update({
        where: { id: schema.id },
        data: { viewSettings: JSON.stringify(next) },
      })
    } else if (action === 'disable') {
      await prisma.notebookSchema.delete({ where: { id: schema.id } })
      return NextResponse.json({ success: true, data: { schema: null } })
    } else {
      return NextResponse.json({ success: false, error: 'Unknown action' }, { status: 400 })
    }

    const raw = await prisma.notebookSchema.findUnique({
      where: { notebookId },
      include: schemaInclude,
    })

    return NextResponse.json({ success: true, data: { schema: serializeSchema(raw) } })
  } catch (error) {
    console.error('PATCH notebook schema:', error)
    return NextResponse.json({ success: false, error: 'Failed to update schema' }, { status: 500 })
  }
}