import { isValidTimeZone } from "@beenvoice/domain/time-zone";
import { and, eq } from "drizzle-orm";
import { TRPCError } from "@trpc/server";
import { z } from "zod";

import { getRequestOrigin } from "~/lib/app-url";
import { createTRPCRouter, sessionProcedure } from "~/server/api/trpc";
import { backgroundJobs, invoices } from "~/server/db/schema";
import { enqueueJob, jobTypes } from "~/server/jobs/queue";
import { deliverInvoiceEmail } from "~/server/services/send-invoice-email";

const emailOptionsSchema = z.object({
  invoiceId: z.string().min(1),
  customSubject: z.string().max(500).optional(),
  customContent: z.string().max(50_000).optional(),
  customMessage: z.string().max(10_000).optional(),
  useHtml: z.boolean().default(false),
  ccEmails: z.string().max(2_000).optional(),
  bccEmails: z.string().max(2_000).optional(),
});

export const emailRouter = createTRPCRouter({
  sendInvoice: sessionProcedure
    .input(emailOptionsSchema)
    .mutation(async ({ ctx, input }) =>
      deliverInvoiceEmail({
        ...input,
        actorUserId: ctx.session.user.id,
        baseUrl: getRequestOrigin(ctx.headers),
      }),
    ),

  scheduleInvoice: sessionProcedure
    .input(
      emailOptionsSchema.extend({
        scheduledAt: z.coerce.date(),
        timeZone: z
          .string()
          .min(1)
          .max(100)
          .refine(isValidTimeZone, "Invalid time zone"),
      }),
    )
    .mutation(async ({ ctx, input }) => {
      const invoice = await ctx.db.query.invoices.findFirst({
        where: and(
          eq(invoices.id, input.invoiceId),
          eq(invoices.createdById, ctx.session.user.id),
        ),
        with: { client: true, items: true },
      });
      if (!invoice)
        throw new TRPCError({
          code: "NOT_FOUND",
          message: "Invoice not found",
        });
      if (!invoice.client?.email) {
        throw new TRPCError({
          code: "BAD_REQUEST",
          message: "Client has no email address",
        });
      }
      if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(invoice.client.email)) {
        throw new TRPCError({
          code: "BAD_REQUEST",
          message: "Invalid client email address format",
        });
      }
      if (!invoice.items.length) {
        throw new TRPCError({
          code: "BAD_REQUEST",
          message: "Add at least one line item before sending this invoice",
        });
      }
      if (input.scheduledAt.getTime() < Date.now() + 60_000) {
        throw new TRPCError({
          code: "BAD_REQUEST",
          message: "Choose a send time at least one minute in the future",
        });
      }
      if (
        invoice.scheduledSendJobId &&
        invoice.scheduledSendStatus === "processing"
      ) {
        throw new TRPCError({
          code: "CONFLICT",
          message: "This invoice is already being sent",
        });
      }
      const idempotencyKey = `${jobTypes.sendInvoice}:${invoice.id}:${input.scheduledAt.toISOString()}:${crypto.randomUUID()}`;
      const job = await enqueueJob({
        type: jobTypes.sendInvoice,
        idempotencyKey,
        runAt: input.scheduledAt,
        payload: {
          invoiceId: invoice.id,
          actorUserId: ctx.session.user.id,
          customSubject: input.customSubject,
          customContent: input.customContent,
          customMessage: input.customMessage,
          useHtml: input.useHtml,
          ccEmails: input.ccEmails,
          bccEmails: input.bccEmails,
          timeZone: input.timeZone,
        },
      });
      if (!job) {
        throw new TRPCError({
          code: "CONFLICT",
          message: "Unable to schedule invoice",
        });
      }

      await ctx.db.transaction(async (tx) => {
        if (
          invoice.scheduledSendJobId &&
          invoice.scheduledSendStatus === "pending"
        ) {
          await tx
            .update(backgroundJobs)
            .set({ status: "cancelled", updatedAt: new Date() })
            .where(
              and(
                eq(backgroundJobs.id, invoice.scheduledSendJobId),
                eq(backgroundJobs.status, "pending"),
              ),
            );
        }
        await tx
          .update(invoices)
          .set({
            scheduledSendAt: input.scheduledAt,
            scheduledSendTimeZone: input.timeZone,
            scheduledSendJobId: job.id,
            scheduledSendStatus: "pending",
            updatedAt: new Date(),
          })
          .where(eq(invoices.id, invoice.id));
      });

      return {
        success: true,
        jobId: job.id,
        scheduledAt: input.scheduledAt.toISOString(),
        timeZone: input.timeZone,
      };
    }),

  cancelScheduledInvoice: sessionProcedure
    .input(z.object({ invoiceId: z.string().min(1) }))
    .mutation(async ({ ctx, input }) => {
      const invoice = await ctx.db.query.invoices.findFirst({
        where: and(
          eq(invoices.id, input.invoiceId),
          eq(invoices.createdById, ctx.session.user.id),
        ),
      });
      if (!invoice)
        throw new TRPCError({
          code: "NOT_FOUND",
          message: "Invoice not found",
        });
      if (
        !invoice.scheduledSendJobId ||
        invoice.scheduledSendStatus !== "pending"
      ) {
        throw new TRPCError({
          code: "CONFLICT",
          message: "This scheduled send can no longer be cancelled",
        });
      }

      const cancelled = await ctx.db
        .update(backgroundJobs)
        .set({ status: "cancelled", updatedAt: new Date() })
        .where(
          and(
            eq(backgroundJobs.id, invoice.scheduledSendJobId),
            eq(backgroundJobs.status, "pending"),
          ),
        )
        .returning({ id: backgroundJobs.id });
      if (!cancelled.length) {
        throw new TRPCError({
          code: "CONFLICT",
          message: "The worker has already started sending this invoice",
        });
      }

      await ctx.db
        .update(invoices)
        .set({ scheduledSendStatus: "cancelled", updatedAt: new Date() })
        .where(eq(invoices.id, invoice.id));
      return { success: true };
    }),
});