package main

import (
	"bytes"
	"fmt"
	"os"
	"path/filepath"
	"strings"

	onlyoffice "github.com/eslider/go-onlyoffice"
	"github.com/spf13/cobra"
)

func docsCommentCmd() *cobra.Command {
	var spec, author, out, basePath string
	var replace bool
	cmd := &cobra.Command{
		Use:   "comment FILE_ID",
		Short: "Add Word comments to an OO .docx, anchored to paragraph text",
		Long: `Adds real Word (DOCX) comments to a Documents file and, with --replace,
uploads the annotated copy back over the same file id.

OnlyOffice Workspace exposes no comments REST route (GET/POST
/api/2.0/files/file/{id}/comment answer 404/500), while ONLYOFFICE Docs renders
DOCX comments natively, so the comments are injected into the file itself.

The spec is a JSON array of {"anchor":"<paragraph text>","text":"<comment>"}.
An anchor is matched against the paragraph's concatenated text, so it survives
text split across runs. At most one comment lands on a paragraph.

  oo docs comment 4379 --spec comments.json --out review.docx
  oo docs comment 4379 --spec comments.json --replace`,
		Args: cobra.ExactArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			if spec == "" {
				return fmt.Errorf("--spec is required")
			}
			raw, err := os.ReadFile(spec)
			if err != nil {
				return err
			}
			comments, err := onlyoffice.ParseDocxComments(raw)
			if err != nil {
				return err
			}
			if len(comments) == 0 {
				return fmt.Errorf("spec %s has no comments", spec)
			}

			c, err := newOO(cmd)
			if err != nil {
				return err
			}
			ctx := cmd.Context()

			meta, err := c.GetFile(ctx, args[0])
			if err != nil {
				return err
			}
			title := onlyoffice.FileEntryTitle(meta)
			if title == "" {
				title = "file-" + args[0] + ".docx"
			}
			if !strings.HasSuffix(strings.ToLower(title), ".docx") {
				return fmt.Errorf("%s is not a .docx (comments need Word format)", title)
			}

			var base []byte
			if basePath != "" {
				base, err = os.ReadFile(basePath)
				if err != nil {
					return err
				}
			} else {
				var buf bytes.Buffer
				if _, err := c.DownloadFile(ctx, args[0], &buf); err != nil {
					return err
				}
				base = buf.Bytes()
			}
			if author == "" {
				author = selfDisplayName(cmd)
			}
			annotated, applied, err := onlyoffice.InjectDocxComments(base, author, comments)
			if err != nil {
				return err
			}
			if applied == 0 {
				return fmt.Errorf("no anchor matched; check the spec against the document text")
			}

			dest := out
			if dest == "" {
				base := strings.TrimSuffix(onlyoffice.SafeLocalFileName(title), filepath.Ext(onlyoffice.SafeLocalFileName(title)))
				dest = base + " - comments.docx"
			}
			if err := os.WriteFile(dest, annotated, 0o600); err != nil {
				return err
			}

			obj := map[string]any{
				"file_id":         args[0],
				"title":           title,
				"comments":        len(comments),
				"applied":         applied,
				"author":          author,
				"local":           dest,
				"replaced":        false,
				"onlyoffice_link": c.FileEditorURL(args[0]),
			}
			if replace {
				tmp, err := os.MkdirTemp("", "oo-docs-comment-*")
				if err != nil {
					return err
				}
				defer os.RemoveAll(tmp)
				up := filepath.Join(tmp, onlyoffice.SafeLocalFileName(title))
				if err := os.WriteFile(up, annotated, 0o600); err != nil {
					return err
				}
				// UpdateFile replaces the content in place, keeping the file id
				// (so existing links and the CRM entry stay valid).
				if _, err := c.UpdateFile(ctx, args[0], up); err != nil {
					return err
				}
				obj["replaced"] = true
				obj["folder_id"] = onlyoffice.FileFolderID(meta)
			}
			printJSON(obj)
			return nil
		},
	}
	cmd.Flags().StringVar(&spec, "spec", "", "JSON file: [{\"anchor\":...,\"text\":...}] (required)")
	cmd.Flags().StringVar(&author, "author", "", "comment author (default: the authenticated portal user)")
	cmd.Flags().StringVar(&out, "out", "", "local output path (default: <title> - comments.docx)")
	cmd.Flags().StringVar(&basePath, "base", "", "local clean .docx to annotate instead of downloading FILE_ID (re-apply without stacking comments)")
	cmd.Flags().BoolVar(&replace, "replace", false, "upload the annotated copy back over the same file id")
	return cmd
}

// selfDisplayName resolves the authenticated user's display name for the
// comment author, falling back to first and last name, then to "OnlyOffice".
func selfDisplayName(cmd *cobra.Command) string {
	c, err := newOO(cmd)
	if err != nil {
		return "OnlyOffice"
	}
	ctx := cmd.Context()
	id, err := c.SelfUserID(ctx)
	if err != nil || id == "" {
		return "OnlyOffice"
	}
	u, err := c.GetUser(ctx, id)
	if err != nil {
		return "OnlyOffice"
	}
	if s, ok := u["displayName"].(string); ok && strings.TrimSpace(s) != "" {
		return s
	}
	first, _ := u["firstName"].(string)
	last, _ := u["lastName"].(string)
	if name := strings.TrimSpace(first + " " + last); name != "" {
		return name
	}
	return "OnlyOffice"
}