// SPDX-FileCopyrightText: Amolith <amolith@secluded.site>
//
// SPDX-License-Identifier: AGPL-3.0-or-later

package note

import (
	"fmt"

	"git.secluded.site/go-lunatask"
	"git.secluded.site/lune/internal/client"
	"git.secluded.site/lune/internal/completion"
	"git.secluded.site/lune/internal/config"
	"git.secluded.site/lune/internal/dateutil"
	"git.secluded.site/lune/internal/ui"
	"git.secluded.site/lune/internal/validate"
	"github.com/spf13/cobra"
)

// UpdateCmd updates a note. Exported for potential use by shortcuts.
var UpdateCmd = &cobra.Command{
	Use:   "update ID",
	Short: "Update a note",
	Long: `Update an existing note in Lunatask.

Accepts a UUID or lunatask:// deep link.
Only specified flags are modified; other fields remain unchanged.`,
	Args: cobra.ExactArgs(1),
	RunE: runUpdate,
}

func init() {
	UpdateCmd.Flags().String("name", "", "New note name")
	UpdateCmd.Flags().StringP("notebook", "b", "", "Move to notebook key")
	UpdateCmd.Flags().StringP("content", "c", "", "Note content (use - for stdin)")
	UpdateCmd.Flags().StringP("date", "d", "", "Note date (natural language)")

	_ = UpdateCmd.RegisterFlagCompletionFunc("notebook", completion.Notebooks)
}

func runUpdate(cmd *cobra.Command, args []string) error {
	id, err := validate.Reference(args[0])
	if err != nil {
		return err
	}

	apiClient, err := client.New()
	if err != nil {
		return err
	}

	builder := apiClient.NewNoteUpdate(id)

	if err := applyUpdateName(cmd, builder); err != nil {
		return err
	}

	if err := applyUpdateNotebook(cmd, builder); err != nil {
		return err
	}

	if err := applyUpdateContent(cmd, builder); err != nil {
		return err
	}

	if err := applyUpdateDate(cmd, builder); err != nil {
		return err
	}

	note, err := ui.Spin("Updating note…", func() (*lunatask.Note, error) {
		return builder.Update(cmd.Context())
	})
	if err != nil {
		return err
	}

	fmt.Fprintln(cmd.OutOrStdout(), ui.Success.Render("Updated note: "+note.ID))

	return nil
}

func applyUpdateName(cmd *cobra.Command, builder *lunatask.NoteUpdateBuilder) error {
	name, _ := cmd.Flags().GetString("name")
	if name == "" {
		return nil
	}

	resolved, err := resolveName(name)
	if err != nil {
		return err
	}

	builder.WithName(resolved)

	return nil
}

func applyUpdateNotebook(cmd *cobra.Command, builder *lunatask.NoteUpdateBuilder) error {
	notebookKey, _ := cmd.Flags().GetString("notebook")
	if notebookKey == "" {
		return nil
	}

	cfg, err := config.Load()
	if err != nil {
		return err
	}

	notebook := cfg.NotebookByKey(notebookKey)
	if notebook == nil {
		return fmt.Errorf("%w: %s", ErrUnknownNotebook, notebookKey)
	}

	builder.InNotebook(notebook.ID)

	return nil
}

func applyUpdateContent(cmd *cobra.Command, builder *lunatask.NoteUpdateBuilder) error {
	content, _ := cmd.Flags().GetString("content")
	if content == "" {
		return nil
	}

	resolved, err := resolveContent(content)
	if err != nil {
		return err
	}

	builder.WithContent(resolved)

	return nil
}

func applyUpdateDate(cmd *cobra.Command, builder *lunatask.NoteUpdateBuilder) error {
	dateStr, _ := cmd.Flags().GetString("date")
	if dateStr == "" {
		return nil
	}

	date, err := dateutil.Parse(dateStr)
	if err != nil {
		return err
	}

	builder.OnDate(date)

	return nil
}