package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strings"
	"time"

	"gopkg.in/yaml.v2"
)

type (
	DB interface {
		HistoryOf(string) map[string][]History
		Next(string, string) time.Time
		Question(string) Question
		LastAnswer(string, string) (string, Answer)
		Answer(string) Answer
		PushAnswer(string, string, string, bool) error
	}
	Question struct {
		Q     string
		Clues []string
		Tags  []string
	}
	Answer struct {
		Q      string
		A      string
		TS     int64
		Author string
	}
	History struct {
		A    string
		TS   int64
		Pass bool
	}
)

func main() {
	if err := Main(); err != nil {
		panic(err)
	}
}

func Main() error {
	db, err := NewDB()
	if err != nil {
		return err
	}
	user := os.Getenv("USER")
	for q, history := range db.HistoryOf(user) {
		log.Printf("%s/%s/%+v", user, q, history)
		if time.Until(db.Next(user, q)) > 0 {
			continue
		}
		question := db.Question(q)
		fmt.Printf("> Q: %s\n", question.Q)
		fmt.Printf("> %+v\n", question.Tags)
		var response string
		for i := range question.Clues {
			if i == 0 {
				fmt.Printf("> /clue for a clue\n")
			}
			response = readline()
			if response != "/clue" {
				break
			}
			fmt.Printf("> %s", question.Clues[i])
			if i+1 < len(question.Clues) {
				fmt.Printf(" | /clue for another clue")
			}
			fmt.Printf("\n")
		}
		if len(question.Clues) == 0 || response == "/clue" {
			response = readline()
		}
		if id, _ := db.LastAnswer(user, q); id == "" {
		} else if lastAnswer := db.Answer(id); lastAnswer.A != "" {
			fmt.Printf("> Last time, you responded:\n\t%s\n", lastAnswer.A)
		}
		fmt.Printf("> Did you pass this time? [Yns]\n")
		switch readline() {
		case "s":
		case "n":
			if err := db.PushAnswer(user, q, response, false); err != nil {
				return err
			}
		default:
			if err := db.PushAnswer(user, q, response, true); err != nil {
				return err
			}
		}
		fmt.Println()
	}
	if b, _ := yaml.Marshal(db); len(b) > 0 {
		log.Printf("%s\n", b)
	}
	return nil
}

func readline() string {
	fmt.Printf("\t")
	reader := bufio.NewReader(os.Stdin)
	text, _ := reader.ReadString('\n')
	return strings.TrimSpace(text)
}

func NewDB() (DB, error) {
	var db yamlDB
	if b, err := os.ReadFile(os.Getenv("DB")); err != nil {
		return nil, err
	} else if err := yaml.Unmarshal(b, &db); err != nil {
		return nil, err
	}
	return db, nil
}