package note

import (
	"context"
	"encoding/json"
	"log/slog"

	filehandling "github.com/KristianJBorgwarth/dendrite.daemon/core/file_handling"
	"github.com/KristianJBorgwarth/dendrite.daemon/core/models"
	"github.com/KristianJBorgwarth/dendrite.daemon/core/services"
	"github.com/KristianJBorgwarth/dendrite.daemon/persistence"
	"github.com/KristianJBorgwarth/dendrite.daemon/persistence/repositories"
)

type saveNoteCommand struct {
	Path string `json:"path"`
}

type SaveNoteHandler struct {
	uow         *repositories.UnitOfWork
	linkRepo    repositories.ILinkRepository
	tagService  services.ITagService
	noteService services.INoteService
	noteRepo    repositories.NoteRepository
}

func NewSaveNoteHandler(
	uow *repositories.UnitOfWork,
	linkRepo repositories.ILinkRepository,
	tagService services.ITagService,
	noteService services.INoteService,
	noteRepo repositories.NoteRepository,
) *SaveNoteHandler {
	return &SaveNoteHandler{uow, linkRepo, tagService, noteService, noteRepo}
}

func (h *SaveNoteHandler) Handle(ctx context.Context, raw json.RawMessage) (any, error) {
	var cmd saveNoteCommand
	slog.Debug("Handling SaveNoteCommand", "raw", string(raw))

	if err := json.Unmarshal(raw, &cmd); err != nil {
		return nil, err
	}

	file, err := filehandling.ReadFile(cmd.Path)
	if err != nil {
		slog.Debug("Failed to read file", "path", cmd.Path, "error", err)
		return nil, err
	}

	tx, err := h.uow.Begin()
	if err != nil {
		return nil, err
	}
	defer h.uow.Rollback()

	note, err := h.noteRepo.GetBySlug(ctx, tx, file.Slug)
	if err != nil {
		slog.Debug("Failed to get note by slug", "slug", file.Slug, "error", err)
		return nil, err
	}


	if note == nil {
		if err := h.handleNewNote(ctx, tx, file); err != nil {
			return nil, err
		}
	} else {
		if err := h.handleExistingNote(ctx, tx, note, file); err != nil {
			return nil, err
		}
	}

	if err := h.uow.Commit(); err != nil {
		return nil, err
	}
	return nil, nil
}

func (h *SaveNoteHandler) handleNewNote(
	ctx context.Context,
	dbCtx persistence.IDbContext,
	file *filehandling.File,
) error {
	note := models.CreateNote(file.Path, file.Title, file.Slug)
	slog.Debug("EXTRACTED FILE", "path", file.Path, "title", file.Title, "slug", file.Slug, "links", file.ExtractedLinks, "tags", file.FrontMatter.Tags)

	if err := h.noteRepo.Insert(ctx, dbCtx, note); err != nil {
		slog.Debug("Failed to insert new note", "noteID", note.ID(), "error", err)
		return err
	}

	links := models.MapToLinkModel(note.ID(), file.ExtractedLinks)

	if err := h.linkRepo.Insert(ctx, dbCtx, links); err != nil {
		slog.Debug("Failed to insert links for new note", "noteID", note.ID(), "error", err)
		return err
	}

	tagModels, err := h.tagService.CreateTags(ctx, dbCtx, file.FrontMatter.Tags)
	if err != nil {
		slog.Debug("Failed to create tags for new note", "noteID", note.ID(), "error", err)
		return err
	}

	if err := h.tagService.CreateNoteTags(ctx, dbCtx, note.ID(), tagModels); err != nil {
		slog.Debug("Failed to insert note tags for new note", "noteID", note.ID(), "error", err)
		return err
	}

	return nil
}

func (h *SaveNoteHandler) handleExistingNote(
	ctx context.Context,
	dbCtx persistence.IDbContext,
	note *models.Note,
	file *filehandling.File,
) error {
	err := h.noteService.DeleteNote(ctx, dbCtx, note.ID())
	if err != nil {
		slog.Debug("Failed to delete existing note relations", "noteID", note.ID(), "error", err)
		return err
	}

	links := models.MapToLinkModel(note.ID(), file.ExtractedLinks)

	if err = h.linkRepo.Insert(ctx, dbCtx, links); err != nil {
		slog.Debug("Failed to insert links for existing note", "noteID", note.ID(), "error", err)
		return err
	}

	tagModels, err := h.tagService.CreateTags(ctx, dbCtx, file.FrontMatter.Tags)
	if err != nil {
		slog.Debug("Failed to create tags for existing note", "noteID", note.ID(), "error", err)
		return err
	}

	if err = h.tagService.CreateNoteTags(ctx, dbCtx, note.ID(), tagModels); err != nil {
		slog.Debug("Failed to insert note tags for existing note", "noteID", note.ID(), "error", err)
		return err
	}

	return nil
}