'use server';
import { createServerClient } from '@/utils/supabase';
import type { Profile, Result } from '@/utils/supabase';
import { getUser, getProfileWithAvatar, getSignedUrl } from '@/lib/actions';

export type UserWithStatus = {
  id?: string;
  user: Profile;
  status: string;
  created_at: string;
  updated_by?: Profile;
};

type PaginatedHistory = {
  statuses: UserWithStatus[];
  meta: {
    current_page: number;
    per_page: number;
    total_pages: number;
    total_count: number;
  };
};

export const getRecentUsersWithStatuses = async (): Promise<
  Result<UserWithStatus[]>
> => {
  const getAvatarUrl = async (url: string | null | undefined) => {
    if (!url) return null;
    const avatarUrl = await getSignedUrl({
      bucket: 'avatars',
      url,
      transform: { width: 128, height: 128 },
    });
    if (avatarUrl.success) return avatarUrl.data;
    else return null;
  };
  try {
    const supabase = await createServerClient();
    const oneDayAgo = new Date(Date.now() - 1000 * 60 * 60 * 24);

    const { data, error } = (await supabase
      .from('statuses')
      .select(
        `
        user:profiles!user_id(*),
        status,
        created_at,
        updated_by:profiles!updated_by_id(*)
      `,
      )
      .gte('created_at', oneDayAgo.toISOString())
      .order('created_at', { ascending: false })) as {
      data: UserWithStatus[];
      error: unknown;
    };

    if (error) throw error as Error;
    if (!data?.length) return { success: true, data: [] };

    // 3️⃣ client-side dedupe: keep the first status you see per user
    const seen = new Set<string>();
    const filtered = data.filter((row) => {
      if (seen.has(row.user.id)) return false;
      seen.add(row.user.id);
      return true;
    });

    const filteredWithAvatars = new Array<UserWithStatus>();
    for (const userWithStatus of filtered) {
      if (userWithStatus.user.avatar_url)
        userWithStatus.user.avatar_url = await getAvatarUrl(
          userWithStatus.user.avatar_url,
        );
      if (userWithStatus.updated_by?.avatar_url)
        userWithStatus.updated_by.avatar_url = await getAvatarUrl(
          userWithStatus.updated_by?.avatar_url,
        );
      filteredWithAvatars.push(userWithStatus);
    }

    return { success: true, data: filteredWithAvatars };
  } catch (error) {
    return { success: false, error: `Error: ${error as Error}` };
  }
};

export const broadcastStatusUpdates = async (
  userStatuses: UserWithStatus[],
): Promise<Result<void>> => {
  try {
    const supabase = await createServerClient();

    for (const userStatus of userStatuses) {
      const broadcast = await supabase.channel('status_updates').send({
        type: 'broadcast',
        event: 'status_updated',
        payload: {
          user_status: userStatus,
          timestamp: new Date().toISOString(),
        },
      });
      if (broadcast === 'error' || broadcast === 'timed out')
        throw new Error(
          'Failed to broadcast status update. Timed out or errored.',
        );
    }
    return { success: true, data: undefined };
  } catch (error) {
    return {
      success: false,
      error: error instanceof Error ? error.message : 'Unknown error',
    };
  }
};

export const updateStatuses = async (
  usersWithStatuses: UserWithStatus[],
  status: string,
): Promise<Result<void>> => {
  try {
    const supabase = await createServerClient();
    const profileResponse = await getProfileWithAvatar();
    if (!profileResponse.success) throw new Error('Not authenticated!');
    const user = profileResponse.data;

    const { data: insertedStatuses, error: insertedStatusesError } =
      await supabase
        .from('statuses')
        .insert(
          usersWithStatuses.map((userWithStatus) => ({
            user_id: userWithStatus.user.id,
            status,
            updated_by_id: user.id,
          })),
        )
        .select();

    if (insertedStatusesError) throw new Error("Couldn't insert statuses!");
    else if (insertedStatuses) {
      const createdAtFallback = new Date(Date.now()).toISOString();
      await broadcastStatusUpdates(
        usersWithStatuses.map((s, i) => {
          return {
            user: s.user,
            status: status,
            created_at: insertedStatuses[i]?.created_at ?? createdAtFallback,
            updated_by: user,
          };
        }),
      );
    }
    return { success: true, data: undefined };
  } catch (error) {
    return {
      success: false,
      error: error instanceof Error ? error.message : 'Unknown error',
    };
  }
};

export const updateUserStatus = async (
  status: string,
): Promise<Result<void>> => {
  try {
    const supabase = await createServerClient();
    const profileResponse = await getProfileWithAvatar();
    if (!profileResponse.success)
      throw new Error(`Not authenticated! ${profileResponse.error}`);
    const userProfile = profileResponse.data;

    const { data: insertedStatus, error: insertedStatusError } = await supabase
      .from('statuses')
      .insert({
        user_id: userProfile.id,
        status,
        updated_by_id: userProfile.id,
      })
      .select()
      .single();
    if (insertedStatusError) throw insertedStatusError as Error;

    await broadcastStatusUpdates([
      {
        user: userProfile,
        status: insertedStatus.status,
        created_at: insertedStatus.created_at,
        updated_by: userProfile,
      },
    ]);

    return { success: true, data: undefined };
  } catch (error) {
    return {
      success: false,
      error: `Error updating user's status: ${error as Error}`,
    };
  }
};

export const getUserHistory = async (
  userId: string,
  page = 1,
  perPage = 50,
): Promise<Result<PaginatedHistory>> => {
  try {
    const supabase = await createServerClient();
    const userResponse = await getUser();
    if (!userResponse.success)
      throw new Error(`Not authenticated! ${userResponse.error}`);

    const offset = (page - 1) * perPage;
    const { count } = await supabase
      .from('statuses')
      .select('*', { count: 'exact', head: true })
      .eq('user_id', userId);

    const { data: statuses, error: statusesError } = (await supabase
      .from('statuses')
      .select(
        `
        id,
        user:profiles!user_id(*),
        status,
        created_at,
        updated_by:profiles!updated_by_id(*)
      `,
      )
      .eq('user_id', userId)
      .order('created_at', { ascending: false })
      .range(offset, offset + perPage - 1)) as {
      data: UserWithStatus[];
      error: unknown;
    };
    if (statusesError) throw statusesError as Error;

    const totalCount = count ?? 0;
    const totalPages = Math.ceil(totalCount / perPage);

    return {
      success: true,
      data: {
        statuses,
        meta: {
          current_page: page,
          per_page: perPage,
          total_pages: totalPages,
          total_count: totalCount,
        },
      },
    };
  } catch (error) {
    return {
      success: false,
      error: `Error getting user's history: ${error as Error}`,
    };
  }
};

export const getAllHistory = async (
  page = 1,
  perPage = 50,
): Promise<Result<PaginatedHistory>> => {
  try {
    const supabase = await createServerClient();
    const userResponse = await getUser();
    if (!userResponse.success)
      throw new Error(`Not authenticated! ${userResponse.error}`);

    const offset = (page - 1) * perPage;
    const { count } = await supabase
      .from('statuses')
      .select('*', { count: 'exact', head: true });

    const { data: statuses, error: statusesError } = (await supabase
      .from('statuses')
      .select(
        `
        id,
        user:profiles!user_id(*),
        status,
        created_at,
        updated_by:profiles!updated_by_id(*)
      `,
      )
      .order('created_at', { ascending: false })
      .range(offset, offset + perPage - 1)) as {
      data: UserWithStatus[];
      error: unknown;
    };
    if (statusesError) throw statusesError as Error;

    const totalCount = count ?? 0;
    const totalPages = Math.ceil(totalCount / perPage);

    return {
      success: true,
      data: {
        statuses,
        meta: {
          current_page: page,
          per_page: perPage,
          total_pages: totalPages,
          total_count: totalCount,
        },
      },
    };
  } catch (error) {
    return {
      success: false,
      error: `Error getting all history: ${error as Error}`,
    };
  }
};