import _ from 'lodash'
import * as z from 'zod'
import type { RouteHandler } from 'fastify'
import config from '../../../config.ts'
import emitter from '../../../lib/emitter.ts'
import knex from '../../../lib/knex.ts'
import AdmissionQueries from '../../../services/admissions/queries.ts'
import InviteQueries from '../../../services/invites/queries.ts'
import UserQueries from '../../../services/users/queries.ts'
import verifyEmailTemplate from '../../../templates/emails/verify_email.ts'
import sendMail from '../../../lib/send_mail.ts'
import StatusError from '../../../lib/status_error.ts'
import { generateToken, hashPassword } from '../helpers.ts'
import type { Invite } from '../../../services/invites/types.ts'
import type { Role } from '../../../services/roles/types.ts'

const admissionQueries = AdmissionQueries({ knex, emitter })
const inviteQueries = InviteQueries({ knex, emitter })
const userQueries = UserQueries({ knex, emitter })

const { errors, timeouts } = config.auth

const BodySchema = z.object({
  email: z.email(),
  password: z.string(),
  inviteEmail: z.email().optional(),
  inviteToken: z.string().optional(),
  // required: config.auth.requireInvite ? ['email', 'password', 'inviteEmail', 'inviteToken'] : ['email', 'password'],
})

const ResponseSchema = {
  201: {
    type: 'object',
    properties: {
      id: { type: 'integer' },
      email: { type: 'string' },
      password: { type: 'string' },
      emailVerifiedAt: { type: 'string' },
      bannedAt: { type: 'string' },
      blockedAt: { type: 'string' },
      loginAttempts: { type: 'integer' },
    },
  },
  '4XX': { $ref: 'status-error' },
}

const register: RouteHandler<{ Body: z.infer<typeof BodySchema> }> = async function (request, reply) {
  try {
    // TODO validate and ensure same as confirm
    const email = request.body.email.trim().toLowerCase()

    let invite: Invite | null = null

    if (request.body.inviteEmail && request.body.inviteToken) {
      invite = await inviteQueries.findOne({ email: request.body.inviteEmail, token: request.body.inviteToken })
      const latestInvite = await inviteQueries.findOne({
        email: request.body.inviteEmail,
        sort: [{ column: 'createdAt', order: 'desc' }],
      })

      if (!invite) {
        throw new StatusError(...errors.tokenNotFound)
      } else if (invite.id !== latestInvite.id) {
        throw new StatusError(...errors.tokenNotLatest)
      } else if (Date.now() > new Date(invite.createdAt).getTime() + timeouts.invite) {
        throw new StatusError(...errors.tokenExpired)
      } else if (invite.consumedAt) {
        throw new StatusError(...errors.tokenConsumed)
      }
    }

    const admissions = await admissionQueries.findMatches(email)

    const roles = Array.from(
      new Set(
        [
          invite?.roles ? invite.roles.map((role) => role.id) : [],
          ...admissions.map((admission) => (admission.roles ? admission.roles.map((role: Role) => role.id) : [])),
        ].flat(),
      ),
    )

    if (!roles.length) {
      throw new StatusError(...errors.notAuthorized)
    }

    const user = await knex.transaction(async (trx) => {
      const user = await userQueries.create(
        {
          email,
          password: await hashPassword(request.body.password),
          roles,
          emailVerifiedAt: invite && invite.email === email ? (knex.fn.now() as unknown as string) : null,
        },
        trx,
      )

      if (invite) {
        await inviteQueries.consume(invite.id, user.id, trx)
      }

      if (!user.emailVerifiedAt) {
        const token = generateToken()

        await trx('email_token').insert({
          user_id: user.id,
          email: user.email,
          token,
        })

        const link = `${new URL('/auth/verify-email', config.site.url)}?email=${user.email}&token=${token}`

        await sendMail({
          to: user.email,
          subject: `Verify ${config.site.title} account`,
          html: await verifyEmailTemplate({ link }).text(),
        })
      }

      return userQueries.findById(user.id)
    })

    reply.type('application/json')

    return reply.status(201).send(_.omit(user, 'password'))
  } catch (err) {
    this.log.error(err)

    // @ts-ignore
    if (err.code == 23505) {
      err = new StatusError(...errors.duplicateEmail)
    }

    if (err instanceof StatusError) {
      return reply
        .status(err.status || 500)
        .type('application/json')
        .send(err.toJSON())
    } else {
      throw err
    }
  }
}

export default {
  handler: register,
  schema: {
    body: BodySchema,
    resopnse: ResponseSchema,
  },
}