package io.oxygenhub.android.ui.proposals

import androidx.lifecycle.ViewModel

import io.oxygenhub.android.api.HubApi

import io.oxygenhub.android.api.Proposal

import io.oxygenhub.android.api.ProposalState

import io.oxygenhub.android.ui.common.Load

import io.oxygenhub.android.ui.common.load

import kotlinx.coroutines.Job

import kotlinx.coroutines.flow.MutableStateFlow

import kotlinx.coroutines.flow.StateFlow

import kotlinx.coroutines.flow.asStateFlow

/** A repository's proposals: open (with drafts), landed, closed or all; newest first. */

class ProposalsViewModel(

    private val api: HubApi,

    val owner: String,

    val name: String,

) : ViewModel() {

    private val _state = MutableStateFlow<Load<List<Proposal>>>(Load.Loading)

    val state: StateFlow<Load<List<Proposal>>> = _state.asStateFlow()

    private val _filter = MutableStateFlow(ProposalState.Open)

    val filter: StateFlow<ProposalState> = _filter.asStateFlow()

    private var job: Job? = null

    init {

        refresh()

    }

    fun setFilter(state: ProposalState) {

        if (state == _filter.value) return

        _filter.value = state

        _state.value = Load.Loading

        refresh()

    }

    fun refresh() {

        val state = _filter.value

        job = load(_state, job) { api.proposals(owner, name, state).sortedByDescending { it.number } }

    }

}