package Parser

import (
	"encoding/json"
	"errors"
	"fmt"
	"io/ioutil"
	"os"

	"github.com/fatih/color"
	"gitlab.com/EternalWanderer/dice-roller/Dice"
)

const exampleFile string = "/etc/sheet-parser/example.json"

var (
	path, pathFlag, skillString, saveString, statString             string
	modifier, diceThrows, surfaces                                  int
	X, Y                                                            int
	char                                                            Character
	skillMap                                                        = make(map[string]int)
	statMap                                                         = make(map[string]int)
	advantage, disadvantage, stat_list, skill_list, verbose, trivia bool
)

func handleError(err error) {
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	}
}

func ReadJson(envVar string) {
	envPath, isSet := os.LookupEnv(envVar)
	switch {
	case len(pathFlag) > 0:
		path = pathFlag
	case isSet:
		path = envPath
	default:
		path = exampleFile
	}

	fmt.Println("Opening file:", path)
	var file, err = os.Open(path)
	handleError(err)
	defer file.Close()

	byteValue, _ := ioutil.ReadAll(file)

	err = json.Unmarshal(byteValue, &char)
	handleError(err)
}

func initMaps() {
	for i := 0; i < len(char.Skills); i++ {
		skillMap[char.Skills[i].SkillName] = i
	}

	for i := 0; i < len(char.Stats); i++ {
		statMap[char.Stats[i].StatName] = i
	}
}

func GetProficiency() int {
	// https://worldbuildersjunction.com/what-is-proficiency-bonus-in-dd-5e-how-it-works-calculated/
	return (char.Misc.Level-1)/4 + 2
}

func GetSkill(skillName string) Skill {
	return char.Skills[skillMap[skillName]]
}

func GetStat(statName string) Stat {
	return char.Stats[statMap[statName]]
}

func GetModifier(stat Stat) int {
	// https://worldbuildersjunction.com/dungeon-and-dragons-ability-scores-explained-for-beginners/
	return (stat.Score - 10) / 2
}

func rollDice() int {
	var die int
	switch {
	case advantage:
		die, X, Y = Dice.Advantage()
	case disadvantage:
		die, X, Y = Dice.Disadvantage()
	default:
		die = Dice.SimpleCast()
	}
	switch die {
	case 20:
		color.Magenta("Natural 20!\n")
	case 1:
		color.Magenta("Natural 1!\n")
	}
	return die
}

func badCheck(errorMessage string, err error) {
	if err == nil {
		return
	}
	fmt.Println(err)
	fmt.Println(errorMessage)
	os.Exit(1)
}

func statErrorCheck() error {
	for i := 0; i < len(char.Stats); i++ {
		if statString == char.Stats[i].StatName || saveString == char.Stats[i].StatName {
			return nil
		}
	}
	return errors.New("Unknown stat:")
}

func skillErrorCheck() error {
	for i := 0; i < len(char.Skills); i++ {
		if skillString == char.Skills[i].SkillName {
			return nil
		}
	}
	return errors.New("Unknown skill:")
}

func statCheck(stat Stat) (int, int, error) {
	die := rollDice()
	return die + GetModifier(stat), die, statErrorCheck()

}

func savingThrow(stat Stat) (int, int, error) {
	die := rollDice()
	plainDie := die

	if stat.Proficient {
		die += GetProficiency()
	}
	return die + GetModifier(stat), plainDie, statErrorCheck()
}

func SkillCheck(skill Skill) (int, int, error) {
	die := rollDice()
	if char.Misc.ReliableTalent && skill.Proficient && die < 10 {
		die = 10
	}
	plainDie := die

	die += GetModifier(GetStat(skill.BaseStat))

	switch {
	case skill.Expertise:
		die += GetProficiency() * 2
	case skill.Proficient:
		die += GetProficiency()
	case !skill.Proficient && char.Misc.JackOfAllTrades:
		die += (GetProficiency() / 2)
	}
	return die, plainDie, skillErrorCheck()
}

func PrintStatList(verbose bool) {
	color.Magenta("Listing stats...")
	if verbose {
		var proficiency string
		for i := 0; i < len(char.Stats); i++ {
			name := char.Stats[i].StatName
			isProficient := char.Stats[i].Proficient
			if isProficient {
				proficiency = "Proficient"
			} else {
				proficiency = "Not proficient"
			}
			score := char.Stats[i].Score
			fmt.Printf("Stat: %13s\t%s\tStat score: %2d\tStat modifier: %2d\n", name, proficiency, score, GetModifier(char.Stats[i]))
		}
	} else {
		for i := 0; i < len(char.Stats); i++ {
			fmt.Println(char.Stats[i].StatName)
		}
	}
}

func PrintSkillList(verbose bool) {
	color.Magenta("Listing skills...")
	var proficiency string
	var expertise string
	if verbose {
		for i := 0; i < len(char.Skills); i++ {
			name := char.Skills[i].SkillName
			localModifier := GetModifier(GetStat(char.Skills[i].BaseStat))
			if char.Skills[i].Proficient {
				proficiency = "Proficient"
				localModifier += GetProficiency()
			} else {
				proficiency = "Not proficient"
			}
			if char.Skills[i].Expertise {
				expertise = "Has expertise"
				localModifier += GetProficiency()
			} else {
				expertise = "Doesn't have expertise"
			}
			fmt.Printf("Skill:%16s\tSkill modifier:%3d\t%s\t%s\n", name, localModifier, proficiency, expertise)
		}
	} else {
		for i := 0; i < len(char.Skills); i++ {
			fmt.Println(char.Skills[i].SkillName)
		}
	}
}