import { isApiError } from "@/lib/errors"
import type { Post } from "@/lib/types"

import { httpJson } from "./http"

type Paginated<T> = {
  items: T[]
  meta: {
    total: number
    offset: number
    limit: number
  }
}

type ListOptions = {
  offset?: number
  limit?: number
}

function withOffsetLimit(path: string, options?: ListOptions): string {
  const offset = options?.offset ?? 0
  const limit = options?.limit ?? 100

  const searchParams = new URLSearchParams({
    offset: String(offset),
    limit: String(limit),
  })
  return `${path}?${searchParams.toString()}`
}

export async function listPosts(options?: ListOptions): Promise<Post[]> {
  const res = await httpJson<Paginated<Post>>(withOffsetLimit("/api/v1/posts", options), {
    cache: "no-store",
  })
  return res.items
}

export async function getPostById(postId: string): Promise<Post | undefined> {
  try {
    return await httpJson<Post>(`/api/v1/posts/${encodeURIComponent(postId)}`, {
      cache: "no-store",
    })
  } catch (error) {
    if (error instanceof Error && error.message === "UNAUTHORIZED") {
      throw error
    }
    if (isApiError(error) && error.code === 404) {
      return undefined
    }
    throw error
  }
}

export async function listPostsByAuthor(userId: string, options?: ListOptions): Promise<Post[]> {
  const res = await httpJson<Paginated<Post>>(
    withOffsetLimit(`/api/v1/users/${encodeURIComponent(userId)}/posts`, options),
    {
      cache: "no-store",
    },
  )
  return res.items
}

export async function togglePostLike(postId: string, currentlyLiked: boolean): Promise<void> {
  const encodedId = encodeURIComponent(postId)
  if (currentlyLiked) {
    await httpJson<unknown>(`/api/v1/posts/${encodedId}/like`, {
      method: "DELETE",
      cache: "no-store",
    })
    return
  }

  await httpJson<unknown>(`/api/v1/posts/${encodedId}/like`, {
    method: "POST",
    cache: "no-store",
  })
}