"use server";

import { db } from "@/db";
import { submissions, answers } from "@/db/schema";
import { eq } from "drizzle-orm";
import { revalidatePath } from "next/cache";
import { getServerSession } from "next-auth";
import { authOptions } from "@/app/api/auth/[...nextauth]/route";

export async function submitForm(
  formId: string,
  answersList: { questionId: string; value: string }[]
) {
  const session = await getServerSession(authOptions);
  if (!session?.user) throw new Error("Not authenticated");

  const discordId = (session.user as { discordId?: string }).discordId;
  if (!discordId) throw new Error("No Discord ID found");

  const form = await db.query.forms.findFirst({
    where: (f, { eq }) => eq(f.id, formId),
  });
  if (!form) throw new Error("Form not found");
  if (!form.isOpen) throw new Error("This form is disabled for now");

  const existingSubmission = await db.query.submissions.findFirst({
    where: (s, { eq, and }) =>
      and(eq(s.formId, formId), eq(s.userDiscordId, discordId)),
  });

  let submissionId = "";
  const isUpdate = !!existingSubmission;

  if (existingSubmission) {
    submissionId = existingSubmission.id;

    // Fetch old answers
    const oldAnswersList = await db.query.answers.findMany({
      where: (a, { eq }) => eq(a.submissionId, submissionId),
    });

    const oldAnswersDict = oldAnswersList.reduce((acc, curr) => {
      acc[curr.questionId] = curr.value;
      return acc;
    }, {} as Record<string, string>);

    // Ensure editHistory is an array
    let history = existingSubmission.editHistory;
    if (!Array.isArray(history)) {
      history = [];
    }

    // Push the old answers to history
    history.push({
      editedAt: new Date().toISOString(),
      oldAnswers: oldAnswersDict,
    });

    // Update submission record
    await db
      .update(submissions)
      .set({
        editHistory: history,
      })
      .where(eq(submissions.id, submissionId));

    // Delete old answers
    await db.delete(answers).where(eq(answers.submissionId, submissionId));
  } else {
    // Insert new submission
    const [inserted] = await db
      .insert(submissions)
      .values({
        formId,
        userDiscordId: discordId,
        userName: session.user.name ?? null,
      })
      .returning();
    submissionId = inserted.id;
  }

  // Insert new/updated answers
  if (answersList.length > 0) {
    await db.insert(answers).values(
      answersList.map((a) => ({
        submissionId,
        questionId: a.questionId,
        value: a.value,
      }))
    );
  }

  // Send Discord Webhook
  const templateToUse = isUpdate ? (form as any).discordWebhookUpdateTemplate : form.discordWebhookTemplate;

  if (form.discordWebhookUrl && templateToUse) {
    try {
      const questionsList = await db.query.questions.findMany({
        where: (q, { eq }) => eq(q.formId, formId),
        orderBy: (q, { asc }) => asc(q.displayOrder)
      });
      const questionMap = questionsList.reduce((acc, q, index) => {
        acc[q.id] = String(index + 1);
        return acc;
      }, {} as Record<string, string>);

      const answersDict = answersList.reduce((acc, a) => {
        const idx = questionMap[a.questionId];
        if (idx) {
          acc[idx] = a.value;
        }
        return acc;
      }, {} as Record<string, string>);

      let message = templateToUse;
      // Replace {1}, {2}, etc. with value, and new variables
      message = message.replace(/\{([^}]+)\}/g, (match: string, p1: string) => {
        const key = p1.toLowerCase();
        if (key === "username" || key === "displayname") {
          return session.user?.name || "Unknown User";
        }
        if (key === "id") {
          return discordId || "Unknown ID";
        }
        return answersDict[p1] || "Not Provided";
      });

      await fetch(form.discordWebhookUrl, {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          content: message,
        }),
      });
    } catch (e) {
      console.error("Failed to send webhook", e);
    }
  }

  revalidatePath("/form/admin/result");
  return { ok: true };
}

export async function deleteSubmission(id: string) {
  const session = await getServerSession(authOptions);
  if (!session?.user) throw new Error("Not authenticated");

  await db.delete(submissions).where(eq(submissions.id, id));
  revalidatePath("/form/admin/result");
  return { ok: true };
}

export async function deleteAllSubmissions(formId: string) {
  const session = await getServerSession(authOptions);
  if (!session?.user) throw new Error("Not authenticated");

  await db.delete(submissions).where(eq(submissions.formId, formId));
  revalidatePath(`/admin/form/${formId}/result`);
  return { ok: true };
}

export async function deleteOwnSubmission(formId: string) {
  const session = await getServerSession(authOptions);
  if (!session?.user) throw new Error("Not authenticated");

  const discordId = (session.user as { discordId?: string }).discordId;
  if (!discordId) throw new Error("No Discord ID found");

  const { and } = await import("drizzle-orm");

  await db.delete(submissions).where(
    and(
      eq(submissions.formId, formId),
      eq(submissions.userDiscordId, discordId)
    )
  );
  revalidatePath(`/form`);
  revalidatePath("/form/admin/result");
  return { ok: true };
}