package com.aiosman.riderpro.data

import androidx.paging.PagingSource
import androidx.paging.PagingState
import com.aiosman.riderpro.data.api.ApiClient
import com.aiosman.riderpro.model.MomentEntity
import com.aiosman.riderpro.test.TestDatabase
import java.io.IOException

data class UserAuth(
    val id: Int,
    val token: String? = null
)

class AccountPagingSource(
    private val userService: UserService,
    private val nickname: String? = null
) : PagingSource<Int, AccountProfileEntity>() {
    override suspend fun load(params: LoadParams<Int>): LoadResult<Int, AccountProfileEntity> {
        return try {
            val currentPage = params.key ?: 1
            val users = userService.getUsers(
                page = currentPage,
                nickname = nickname
            )
            LoadResult.Page(
                data = users.list,
                prevKey = if (currentPage == 1) null else currentPage - 1,
                nextKey = if (users.list.isEmpty()) null else users.page + 1
            )
        } catch (exception: IOException) {
            return LoadResult.Error(exception)
        }
    }

    override fun getRefreshKey(state: PagingState<Int, AccountProfileEntity>): Int? {
        return state.anchorPosition
    }

}

interface UserService {
    suspend fun getUserProfile(id: String): AccountProfileEntity
    suspend fun followUser(id: String)
    suspend fun unFollowUser(id: String)
    suspend fun getUsers(
        pageSize: Int = 20,
        page: Int = 1,
        nickname: String? = null
    ): ListContainer<AccountProfileEntity>

}

class TestUserServiceImpl : UserService {
    override suspend fun getUserProfile(id: String): AccountProfileEntity {
        val resp = ApiClient.api.getAccountProfileById(id.toInt())
        val body = resp.body() ?: throw ServiceException("Failed to get account")
        return body.data.toAccountProfileEntity()
    }

    override suspend fun followUser(id: String) {
        val resp = ApiClient.api.followUser(id.toInt())
        return
    }

    override suspend fun unFollowUser(id: String) {
        val resp = ApiClient.api.unfollowUser(id.toInt())
        return
    }

    override suspend fun getUsers(
        pageSize: Int,
        page: Int,
        nickname: String?
    ): ListContainer<AccountProfileEntity> {
        val resp = ApiClient.api.getUsers(page, pageSize, nickname)
        val body = resp.body() ?: throw ServiceException("Failed to get account")
        return ListContainer<AccountProfileEntity>(
            list = body.list.map { it.toAccountProfileEntity() },
            page = body.page,
            total = body.total,
            pageSize = body.pageSize
        )
    }
}