/*
Copyright © 2024 filifa

This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cmd

import (
	"encoding/json"
	"errors"
	"fmt"
	"log"
	"os"
	"strconv"
	"time"

	"github.com/spf13/cobra"
	"scm.dairydemon.net/filifa/mlblive/cmd/internal/statsapi"
)

var Team string

func getGamePk() (string, error) {
	if Team == "" {
		return "", errors.New("need team ID")
	}

	id, ok := statsapi.TeamIds[Team]
	if !ok {
		return "", errors.New("invalid team ID")
	}

	sched, err := statsapi.RequestSchedule("1", strconv.Itoa(id))
	if err != nil {
		return "", err
	}

	var s statsapi.Schedule
	err = json.Unmarshal(sched, &s)
	if err != nil {
		return "", err
	}

	gamePk := s.Dates[0].Games[0].GamePk.String()
	return gamePk, nil
}

func updateFeed(feedResp []byte, gamePk, ts, updateId string) ([]byte, error) {
	diffPatchResp, err := statsapi.RequestDiffPatch(gamePk, ts, updateId)
	if err != nil {
		return statsapi.RequestFeed(gamePk)
	}

	patches, err := diffPatchResp.ExtractPatches()
	if err != nil {
		return statsapi.RequestFeed(gamePk)
	}

	for _, patch := range patches {
		feedResp, err = patch.Apply(feedResp)
		if err != nil {
			return statsapi.RequestFeed(gamePk)
		}
	}

	return feedResp, err
}

func mlblive(cmd *cobra.Command, args []string) {
	gamePk, err := getGamePk()
	if err != nil {
		log.Fatal(err)
	}

	ws, err := statsapi.NewGamedayWebsocket(gamePk)
	if err != nil {
		log.Fatal(err)
	}
	defer ws.Close()

	ch := make(chan error)
	go ws.KeepAlive(10*time.Second, ch)

	feedResp, err := statsapi.RequestFeed(gamePk)
	if err != nil {
		log.Fatal(err)
	}

	var feed statsapi.Feed
	for {
		fmt.Println(string(feedResp))

		err = json.Unmarshal(feedResp, &feed)
		if err != nil {
			log.Fatal(err)
		}
		ts := feed.MetaData.TimeStamp

		var p statsapi.Push
		err = ws.ReadJSON(&p)
		if err != nil {
			log.Fatal(err)
		}

		feedResp, err = updateFeed(feedResp, gamePk, ts, p.UpdateId)
		if err != nil {
			log.Fatal(err)
		}
	}
}

// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
	Use:   "mlblive",
	Short: "Output data from Major League Baseball's Stats API",
	Long:  `Output data from Major League Baseball's Stats API`,
	Run:   mlblive,
}

// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
	err := rootCmd.Execute()
	if err != nil {
		os.Exit(1)
	}
}

func init() {
	// Here you will define your flags and configuration settings.
	// Cobra supports persistent flags, which, if defined here,
	// will be global for your application.

	// Cobra also supports local flags, which will only run
	// when this action is called directly.
	rootCmd.Flags().StringVarP(&Team, "team", "t", "", "team to get updates for")
	rootCmd.MarkFlagRequired("team")
}