import { fail, handleOptions, json } from "../_shared/http.ts";
import {
  createServiceClient,
  requireUser,
  slugify,
} from "../_shared/supabase.ts";

const allowedTypes = new Set(["text", "voice", "operations"]);

Deno.serve(async (req) => {
  const preflight = handleOptions(req);
  if (preflight) return preflight;

  if (req.method !== "POST") return fail("Method not allowed", 405);

  const { user, error: userError } = await requireUser(req);
  if (!user) return fail(userError ?? "Unauthorized", 401);
  const serviceClient = createServiceClient();

  let body: {
    organization_id?: string;
    name?: string;
    description?: string;
    slug?: string;
    type?: string;
    topic?: string;
    position?: number;
    is_private?: boolean;
  };
  try {
    body = await req.json();
  } catch {
    return fail("Invalid JSON body");
  }

  const organizationId = body.organization_id;
  const name = (body.name ?? "").trim();
  const description = (body.description ?? "").trim();
  const type = body.type ?? "text";
  const topic = body.topic?.trim() || null;
  const isPrivate = Boolean(body.is_private);
  const position = Number.isInteger(body.position) ? Number(body.position) : 0;

  if (!organizationId) return fail("organization_id is required");
  if (!name) return fail("name is required");
  if (!allowedTypes.has(type)) return fail("type is invalid");

  const { data: member, error: roleError } = await serviceClient
    .from("organization_members")
    .select("role")
    .eq("organization_id", organizationId)
    .eq("user_id", user.id)
    .maybeSingle();

  if (roleError) return fail(roleError.message, 400);
  if (!member || !["owner", "admin"].includes(member.role)) {
    return fail("forbidden", 403);
  }

  const slug = slugify(body.slug?.trim() || name);
  if (!slug) return fail("slug is invalid");

  const { data: channel, error: createError } = await serviceClient
    .from("channels")
    .insert({
      organization_id: organizationId,
      name,
      description,
      slug,
      type,
      topic,
      is_private: isPrivate,
      position,
      created_by: user.id,
    })
    .select(
      "id, organization_id, name, description, slug, type, topic, is_private, position, created_by, created_at",
    )
    .single();

  if (createError) {
    if (createError.code === "23505") return fail("channel slug already exists", 409);
    return fail(createError.message, 400);
  }

  if (channel.is_private) {
    const { error: cmError } = await serviceClient.from("channel_members").insert({
      channel_id: channel.id,
      user_id: user.id,
    });
    if (cmError) return fail(cmError.message, 400);
  }

  return json({ channel }, 201);
});