package draftbot

import (
	"encoding/json"
	"io/ioutil"
	"net/http"
	"strings"

	"git.fromouter.space/mcg/draft"
	"git.fromouter.space/mcg/draft/mlp"
)

func loadCube(cubeURL string) ([]draft.Card, error) {
	// Fetch document
	resp, err := http.Get(cubeURL)
	if err != nil {
		return nil, err
	}

	respBytes, err := ioutil.ReadAll(resp.Body)
	resp.Body.Close()
	if err != nil {
		return nil, err
	}

	// Each line is a card ID
	cardids := strings.Split(string(respBytes), "\n")
	cards := make([]draft.Card, 0)
	// Convert to draft.Card
	for _, cardid := range cardids {
		cardid := strings.TrimSpace(cardid)
		if len(cardid) < 1 {
			// Skip empty lines
			continue
		}
		cards = append(cards, draft.Card{ID: cardid})
	}
	return cards, nil
}

// I8PCubeConfig is an external JSON doc with the I8PCube pack seeding schema and card list
type I8PCubeConfig struct {
	Schema          mlp.I8PSchema
	ProblemPackSize int
	Cards           map[mlp.I8PType][]string
}

// ToCube creates a I8PCube from the config
func (cfg *I8PCubeConfig) ToCube() (*mlp.I8PCube, error) {
	// Load cards from given list
	var err error
	pool := make(mlp.I8PPool)
	for typ, cardids := range cfg.Cards {
		pool[typ], err = mlp.LoadCardList(cardids, true)
		if err != nil {
			return nil, err
		}
	}

	// Make cube and return it
	return mlp.MakeI8PCube(pool, cfg.Schema, cfg.ProblemPackSize), nil
}

func loadI8PCube(cubeURL string) (*mlp.I8PCube, error) {
	// Fetch document
	resp, err := http.Get(cubeURL)
	if err != nil {
		return nil, err
	}

	// Deserialize response to JSON object
	var cubeconf I8PCubeConfig
	err = json.NewDecoder(resp.Body).Decode(&cubeconf)
	resp.Body.Close()
	if err != nil {
		return nil, err
	}

	// Create cube from config
	return cubeconf.ToCube()
}