package commands

import (
	"encoding/json"
	"fmt"
	"sort"

	"github.com/urfave/cli/v2"

	"github.com/photoprism/photoprism/internal/meta"
	"github.com/photoprism/photoprism/pkg/txt/report"
)

// ShowMetadataCommand configures the command name, flags, and action.
var ShowMetadataCommand = &cli.Command{
	Name:    "metadata",
	Aliases: []string{"meta"},
	Usage:   "Displays supported metadata tags and standards",
	Flags: append(report.CliFlags, &cli.BoolFlag{
		Name:    "short",
		Aliases: []string{"s"},
		Usage:   "hide links to documentation",
	}),
	Action: showMetadataAction,
}

// showMetadataAction reports supported Exif and XMP metadata tags.
func showMetadataAction(ctx *cli.Context) error {
	rows, cols := meta.Report(&meta.Data{})

	// Sort rows by type data type and name.
	sort.Slice(rows, func(i, j int) bool {
		if rows[i][1] == rows[j][1] {
			return rows[i][0] < rows[j][0]
		} else {
			return rows[i][1] < rows[j][1]
		}
	})

	// Output overview of supported metadata tags.
	format, formatErr := report.CliFormatStrict(ctx)
	if formatErr != nil {
		return formatErr
	}
	if format == report.JSON {
		resp := struct {
			Items []map[string]string `json:"items"`
			Docs  []map[string]string `json:"docs,omitempty"`
		}{
			Items: report.RowsToObjects(rows, cols),
		}
		if !ctx.Bool("short") {
			resp.Docs = report.RowsToObjects(meta.Docs, []string{"Namespace", "Documentation"})
		}
		b, err := json.Marshal(resp)
		if err != nil {
			return err
		}
		fmt.Println(string(b))
		return nil
	}

	result, err := report.RenderFormat(rows, cols, format)
	fmt.Println(result)
	if err != nil || ctx.Bool("short") || format == report.TSV {
		return err
	}
	// Documentation links for those who want to delve deeper.
	result, err = report.RenderFormat(meta.Docs, []string{"Namespace", "Documentation"}, format)
	fmt.Printf("## Metadata Tags by Namespace ##\n\n")
	fmt.Println(result)
	return err
}