package story_service

import (
	"context"
	"evening_detective/internal/modules/cleaner"
	"evening_detective/internal/modules/formatter"
	"regexp"
	"strings"
)

type StoryService struct {
	cleaner      cleaner.ICleaner
	formatter    formatter.IFormatter
	story        *Story
	storyStorage IStoryStorage
}

func NewStoryService(
	cleaner cleaner.ICleaner,
	formatter formatter.IFormatter,
	storyStorage IStoryStorage,
) (*StoryService, error) {
	s := &StoryService{
		cleaner:      cleaner,
		formatter:    formatter,
		storyStorage: storyStorage,
	}
	story, err := s.storyStorage.Load(context.Background())
	if err != nil {
		return nil, err
	}
	s.story = story
	return s, nil
}

func (s *StoryService) Update(ctx context.Context) error {
	if err := s.storyStorage.Save(ctx, s.story); err != nil {
		return err
	}
	story, err := s.storyStorage.Load(ctx)
	if err != nil {
		return err
	}
	s.story = story
	return nil
}

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.",
		}
	}
	clearCode := s.cleaner.ClearCode(code)
	for _, place := range s.story.Places {
		if s.cleaner.ClearCode(place.Code) == clearCode {
			applications := make([]*Application, 0, len(place.Applications))
			for _, application := range place.Applications {
				name := s.cleaner.ClearText(application.Name)
				applications = append(
					applications,
					&Application{
						Name: name,
					},
				)
			}
			return &Place{
				Code:         place.Code,
				Name:         place.Name,
				Text:         s.cleaner.ClearText(place.Text),
				Applications: applications,
			}
		}
	}
	return &Place{
		Code: code,
		Name: "Не найдено",
		Text: "Такой точки не существует.",
	}
}

func (s *StoryService) UpdatePlace(ctx context.Context, code string, node *GraphNode) error {
	if code != "" && node.Code == "" {
		return s.deletePlace(ctx, code)
	}
	if code == "" && node.Code != "" {
		return s.addPlace(ctx, node)
	}
	if code == "" || node.Code == "" {
		return nil
	}
	return s.updatePlace(ctx, code, node)
}

func (s *StoryService) deletePlace(ctx context.Context, code string) error {
	for i := range s.story.Places {
		if s.story.Places[i].Code == code {
			s.story.Places = append(s.story.Places[:i], s.story.Places[i+1:]...)
			break
		}
	}
	return s.Update(ctx)
}

func (s *StoryService) addPlace(ctx context.Context, node *GraphNode) error {
	s.story.Places = append(
		s.story.Places,
		&Place{
			Code:         node.Code,
			Name:         node.Name,
			Text:         s.formatter.FormatText(node.Text),
			Applications: s.getApplications(node),
		},
	)
	return s.Update(ctx)
}

func (s *StoryService) updatePlace(ctx context.Context, code string, node *GraphNode) error {
	for i := range s.story.Places {
		if s.story.Places[i].Code == code {
			s.story.Places[i] = &Place{
				Code:         node.Code,
				Name:         node.Name,
				Text:         s.formatter.FormatText(node.Text),
				Applications: s.getApplications(node),
			}
			return s.Update(ctx)
		}
	}
	for i := range s.story.Places {
		if s.story.Places[i].Code == node.Code {
			s.story.Places[i] = &Place{
				Code:         code,
				Name:         node.Name,
				Text:         s.formatter.FormatText(node.Text),
				Applications: s.getApplications(node),
			}
			break
		}
	}
	return s.Update(ctx)
}

func (s *StoryService) getApplications(node *GraphNode) []*Application {
	nodeApplications := make([]*Application, 0, len(node.Applications))
	for _, application := range node.Applications {
		nodeApplications = append(
			nodeApplications,
			&Application{
				Name: application.Name,
			},
		)
	}
	return nodeApplications
}

func (s *StoryService) GetGraph(ctx context.Context) *Graph {
	m := make(map[string]string, len(s.story.Places))
	nodes := make([]*GraphNode, 0, len(s.story.Places))
	for _, place := range s.story.Places {
		m[s.cleaner.ClearCode(place.Code)] = place.Code
		applications := make([]*GraphApplication, 0, len(place.Applications))
		for _, application := range place.Applications {
			applications = append(
				applications,
				&GraphApplication{
					Name: application.Name,
				},
			)
		}
		nodes = append(
			nodes, &GraphNode{
				Code:         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 {
		placeLinks := s.findPlaceLinksInText(place.Text)
		for _, placeLink := range placeLinks {
			edges = append(
				edges,
				&GraphEdge{
					From: m[s.cleaner.ClearCode(place.Code)],
					To:   m[s.cleaner.ClearCode(placeLink)],
					Type: "node",
				},
			)
		}
		for _, application := range place.Applications {
			placeLinks := s.findPlaceLinksInText(application.Name)
			for _, placeLink := range placeLinks {
				edges = append(
					edges,
					&GraphEdge{
						From: m[s.cleaner.ClearCode(place.Code)],
						To:   m[s.cleaner.ClearCode(placeLink)],
						Type: "application",
					},
				)
			}
		}
	}

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

func (s *StoryService) findPlaceLinksInText(text string) []string {
	re := regexp.MustCompile(`\(\[[a-zA-Zа-яА-Я\d-]+\]\)`)
	return re.FindAllString(text, -1)
}