package cli

import (
	"context"
	"fmt"
	"io"

	"gitea.maximumdirect.net/eric/distributor/internal/app"
)

func reconcileStateCommand(ctx context.Context, args []string, stdout, stderr io.Writer) int {
	if hasHelp(args) {
		printReconcileStateHelp(stdout)
		return exitOK
	}

	flags := newFlagSet("reconcile-state", stderr)
	configPath := flags.String("config", "", "path to config file")
	pipelineID := flags.String("pipeline", "", "pipeline id")
	destinationID := flags.String("destination", "", "destination id")
	allOwners := flags.Bool("all-owners", false, "repair all shared-root owners in the selected destination root")
	dryRun := flags.Bool("dry-run", false, "report repairs without rewriting state")
	formatFlag := addFormatFlag(flags)
	if err := flags.Parse(args); err != nil {
		return exitUsage
	}
	if rejectPositionalArgs(stderr, "reconcile-state", flags.Args()) {
		return exitUsage
	}
	format, ok := parseOutputFormat(stderr, "reconcile-state", *formatFlag)
	if !ok {
		return exitUsage
	}
	if !validateReconcileStateFlags(stderr, *configPath, *pipelineID, *destinationID) {
		return exitUsage
	}

	if _, err := app.ReconcileState(ctx, app.ReconcileStateOptions{
		ConfigPath:    *configPath,
		PipelineID:    *pipelineID,
		DestinationID: *destinationID,
		AllOwners:     *allOwners,
		DryRun:        *dryRun,
		Stdout:        stdout,
		OutputFormat:  format,
	}); err != nil {
		return fail(stderr, err)
	}
	return exitOK
}

func validateReconcileStateFlags(stderr io.Writer, configPath, pipelineID, destinationID string) bool {
	if configPath == "" {
		fmt.Fprintf(stderr, "%s: reconcile-state requires --config\n", app.Name)
		return false
	}
	if pipelineID == "" {
		fmt.Fprintf(stderr, "%s: reconcile-state requires --pipeline\n", app.Name)
		return false
	}
	if destinationID == "" {
		fmt.Fprintf(stderr, "%s: reconcile-state requires --destination\n", app.Name)
		return false
	}
	return true
}

func printReconcileStateHelp(w io.Writer) {
	fmt.Fprint(w, `Usage:
  distributor reconcile-state --config <path> --pipeline <id> --destination <id> [--all-owners] [--dry-run] [--format text|json]

Options:
  --config <path>       Path to config file
  --pipeline <id>       Pipeline id that selects the destination root
  --destination <id>    Destination id that selects the destination root
  --all-owners          Repair all shared-root owners in the selected destination root
  --dry-run             Report repairs without rewriting state
  --format text|json    Output format

Reconcile-state checks managed output records against destination storage and
removes records for missing managed outputs unless --dry-run is set. It reports
unmanaged entries but does not delete or adopt destination files.
`)
}