package cli

import (
	"fmt"
	"time"

	"github.com/urfave/cli/v2"
	"sneak.berlin/go/mfer/internal/log"
	"sneak.berlin/go/mfer/mfer"
)

func (mfa *CLIApp) listManifestOperation(ctx *cli.Context) error {
	// Default to ErrorLevel for clean output
	log.SetLevel(log.ErrorLevel)

	longFormat := ctx.Bool("long")
	print0 := ctx.Bool("print0")

	pathOrURL, err := mfa.resolveManifestArg(ctx)
	if err != nil {
		return fmt.Errorf("list: %w", err)
	}

	rc, err := mfa.openManifestReader(pathOrURL)
	if err != nil {
		return fmt.Errorf("list: %w", err)
	}

	defer func() { _ = rc.Close() }()

	manifest, err := mfer.NewManifestFromReader(rc)
	if err != nil {
		return fmt.Errorf("list: failed to parse manifest: %w", err)
	}

	files := manifest.Files()

	// Determine line ending
	lineEnd := "\n"
	if print0 {
		lineEnd = "\x00"
	}

	for _, f := range files {
		if longFormat {
			// An entry may legitimately carry no mtime; render that as
			// mtimeAbsent rather than as the Unix epoch.
			mtimeStr := mtimeAbsent
			if mtime, ok := entryMtime(f); ok {
				mtimeStr = mtime.Format(time.RFC3339)
			}

			_, _ = fmt.Fprintf(mfa.Stdout, "%d\t%s\t%s%s",
				f.GetSize(), mtimeStr, f.GetPath(), lineEnd)
		} else {
			_, _ = fmt.Fprintf(mfa.Stdout, "%s%s", f.GetPath(), lineEnd)
		}
	}

	return nil
}