import { initTRPC, TRPCError } from '@trpc/server'
import superjson from 'superjson'
import { ZodError } from 'zod'
import { type Context } from './context'

const t = initTRPC.context<Context>().create({
  transformer: superjson,
  errorFormatter({ shape, error }) {
    return {
      ...shape,
      data: {
        ...shape.data,
        zodError:
          error.cause instanceof ZodError ? error.cause.flatten() : null,
      },
    }
  },
})

export const router = t.router
export const publicProcedure = t.procedure
export const createCallerFactory = t.createCallerFactory

/**
 * Protected: user must be authenticated
 */
export const protectedProcedure = t.procedure.use(({ ctx, next }) => {
  if (!ctx.session?.user) {
    throw new TRPCError({ code: 'UNAUTHORIZED' })
  }
  return next({
    ctx: {
      ...ctx,
      session: { ...ctx.session, user: ctx.session.user },
    },
  })
})

/**
 * Member: user must belong to an organization
 * Adds orgId + role to context
 */
export const memberProcedure = protectedProcedure.use(async ({ ctx, next }) => {
  const userRole = await ctx.prisma.userRole.findFirst({
    where: { userId: ctx.session.user.id },
    orderBy: { createdAt: 'asc' },
  })
  if (!userRole) {
    throw new TRPCError({
      code: 'FORBIDDEN',
      message: 'You are not a member of any organization.',
    })
  }
  return next({
    ctx: {
      ...ctx,
      orgId: userRole.orgId,
      role: userRole.role,
    },
  })
})

/**
 * Admin: user must be an admin of their organization
 */
export const adminProcedure = protectedProcedure.use(async ({ ctx, next }) => {
  const userRole = await ctx.prisma.userRole.findFirst({
    where: { userId: ctx.session.user.id, role: 'admin' },
    orderBy: { createdAt: 'asc' },
  })
  if (!userRole) {
    throw new TRPCError({
      code: 'FORBIDDEN',
      message: 'Admin access required.',
    })
  }
  return next({
    ctx: {
      ...ctx,
      orgId: userRole.orgId,
      role: 'admin' as const,
    },
  })
})
