package main

import (
	"fmt"
	"log"
	"reflect"
	"regexp"
	"strings"
	"time"
)

func BuildWhereQuery(params interface{}) string {
	conditions := []string{}
	v := reflect.ValueOf(params)
	t := v.Type()

	for i := 0; i < v.NumField(); i++ {
		field := v.Field(i)
		if field.Kind() == reflect.Ptr && !field.IsNil() {
			dbTag := t.Field(i).Tag.Get("db")
			if dbTag != "" {
				switch field.Elem().Kind() {
				case reflect.String:
					conditions = append(conditions, fmt.Sprintf("%s = '%s'", dbTag, field.Elem().String()))
				case reflect.Bool:
					conditions = append(conditions, fmt.Sprintf("%s = %t", dbTag, field.Elem().Bool()))
				case reflect.Int:
					conditions = append(conditions, fmt.Sprintf("%s = %d", dbTag, field.Elem().Int()))
				case reflect.Int64:
					conditions = append(conditions, fmt.Sprintf("%s = %d", dbTag, field.Elem().Int()))
				}
			}
		}
	}

	if len(conditions) > 0 {
		return "WHERE " + strings.Join(conditions, " AND ")
	}
	return ""
}

var associationRe = regexp.MustCompile(`r:(\w+)(?:\(([^)]+)\))?`)
func ParseNote(data string) (NoteData, error) {
	log.Printf("Parsing note: %q", data)
	res := NoteData{}
	lines := strings.Split(data, "\n")
	note := []string{}
	for _, line := range lines {
		line = strings.TrimSpace(line)
		if line == "" {
			continue
		}
		parts := strings.Split(line, ":")
		switch parts[0] {
		case "p":
			res.Player = parts[1]
		case "d":
			var err error
			res.Date, err = time.Parse(time.DateOnly, parts[1])
			if err != nil {
				return res, fmt.Errorf("failed to parse date: %v", err)
			}
		case "g":
			res.Guild = parts[1]
		default:
			note = append(note, line)
		}
	}
	res.Note = strings.Join(note, "\n")

	matches := associationRe.FindAllStringSubmatch(res.Note, -1)
	for _, match := range matches {
		res.Associations = append(res.Associations, NoteAssociationData{
			Player: match[1],
			Note:   match[2],
		})
	}

	return res, nil
}

func PersistNoteData(note NoteData) (Note, []Association, error) {
	res := Note{}
	ass := []Association{}

	res.Content = note.Note
	res.Timestamp = note.Date
	guild, err := gs.GetOrCreate(note.Guild)
	if err != nil {
		return res, ass, fmt.Errorf("failed getting guild for %s: %v", note.Guild, err)
	}

	player, err := ps.GetOrCreate(note.Player, guild)
	if err != nil {
		return res, ass, fmt.Errorf("failed getting player for %s: %v", note.Player, err)
	}
	res.Player = player
	player.Guild = guild

	for _, assoc := range note.Associations {
		assocPlayer, err := ps.GetOrCreate(assoc.Player, Guild{})
		if err != nil {
			return res, ass, fmt.Errorf("failed getting player for %s: %v", assoc.Player, err)
		}
		association, err := as.Create(player, assocPlayer, assoc.Note)
		if err != nil {
			return res, ass, fmt.Errorf("failed creating association: %v", err)
		}
		ass = append(ass, association)
	}

	res, err = ns.Create(res.Content, res.Timestamp, res.Player)
	if err != nil {
		return res, ass, fmt.Errorf("failed creating note: %v", err)
	}

	return res, ass, nil
}