package story_service

import (
	"context"
	"encoding/json"
	"fmt"
	"log"
	"os"
	"regexp"
	"strings"
)

type StoryService struct {
	filepath string
	story    *Story
}

func NewStoryService(filepath string) (*StoryService, error) {
	s := &StoryService{filepath: filepath}
	if err := s.Load(); err != nil {
		return nil, err
	}
	return s, nil
}

func (s *StoryService) Load() error {
	data, err := os.ReadFile(s.filepath)
	if err != nil {
		return fmt.Errorf("story file %s not found", s.filepath)
	}
	log.Printf("load story from: %s", s.filepath)
	story := &Story{}
	if err := json.Unmarshal(data, story); err != nil {
		return err
	}
	s.story = story
	return nil
}

func (s *StoryService) Save() error {
	story := s.story
	data, err := json.Marshal(story)
	if err != nil {
		return err
	}
	if err := os.WriteFile(s.filepath, data, 0x777); err != nil {
		return err
	}
	log.Printf("save story to: %s", s.filepath)
	return nil
}

func (s *StoryService) Update() error {
	if err := s.Save(); err != nil {
		return err
	}
	return s.Load()
}

func (s *StoryService) GetPlace(code string) *Place {
	if strings.HasPrefix(code, "[") || strings.HasSuffix(code, "]") {
		return &Place{
			Code: code,
			Name: "Не найдено",
			Text: "Уважаемые детективы внимательно прочитайте правила.",
		}
	}
	code = clearCode(code)
	for _, place := range s.story.Places {
		if clearCode(place.Code) == code {
			re := regexp.MustCompile(`\(\[[a-zA-Zа-яА-Я\d-]+\]\)`)
			text := re.ReplaceAllString(place.Text, "")
			return &Place{
				Code:         place.Code,
				Name:         place.Name,
				Text:         text,
				Applications: place.Applications,
			}
		}
	}
	return &Place{
		Code: code,
		Name: "Не найдено",
		Text: "Такой точки не существует.",
	}
}

func (s *StoryService) UpdatePlace(node *GraphNode) error {
	for i := range s.story.Places {
		if s.story.Places[i].Code == node.Label {
			s.story.Places[i] = &Place{
				Code:         s.story.Places[i].Code,
				Name:         node.Name,
				Text:         node.Text,
				Applications: s.story.Places[i].Applications,
			}
			break
		}
	}
	s.Update()
	return nil
}

func (s *StoryService) GetGraph(ctx context.Context) *Graph {
	m := make(map[string]int32, len(s.story.Places))
	nodes := make([]*GraphNode, 0, len(s.story.Places))
	for i, place := range s.story.Places {
		m[clearCode(place.Code)] = int32(i)
		applications := make([]*GraphApplication, 0, len(place.Applications))
		for _, application := range place.Applications {
			applications = append(
				applications,
				&GraphApplication{
					Name: application.Name,
				},
			)
		}
		nodes = append(
			nodes, &GraphNode{
				ID:           int32(i),
				Label:        place.Code,
				Name:         place.Name,
				Text:         place.Text,
				Applications: applications,
			},
		)
	}

	edges := make([]*GraphEdge, 0, len(s.story.Places)*3)
	for _, place := range s.story.Places {
		re := regexp.MustCompile(`\(\[[a-zA-Zа-яА-Я\d-]+\]\)`)
		matches := re.FindAllString(place.Text, -1)

		for _, match := range matches {
			edges = append(
				edges,
				&GraphEdge{
					From: m[clearCode(place.Code)],
					To:   m[clearMatch(match)],
				},
			)
		}
	}

	return &Graph{
		Nodes: nodes,
		Edges: edges,
	}
}