package app

import (
	"context"
	"flag"
	"fmt"
	"io"

	"gitea.maximumdirect.net/eric/narratio/internal/config"
)

// Run executes the pipeline plan and persists manifest state.
func Run(ctx context.Context, args []string, out io.Writer) error {
	fs := flag.NewFlagSet("run", flag.ContinueOnError)
	fs.SetOutput(io.Discard)

	var flags commonConfigFlags
	var force bool
	var selectedArtifacts artifactSelectionFlag
	addCommonConfigFlags(fs, &flags)
	fs.BoolVar(&force, "force", false, "rerun stages even when already succeeded")
	fs.Var(&selectedArtifacts, "artifacts", "configured artifact names to execute and publish (comma-separated or repeatable)")

	if err := parseSessionAwareFlags("run", fs, args, &flags.sessionID); err != nil {
		return err
	}
	if flags.sessionID == "" {
		return fmt.Errorf("run: session_id is required")
	}
	loaded, err := loadCommandConfig(ctx, flags.pipelinePath, flags.campaignPath, flags.campaignFilePath, flags.sessionPath, flags.sessionOptions())
	if err != nil {
		return fmt.Errorf("run: %w", err)
	}
	defer func() { _ = loaded.Close() }()
	cfg := loaded.Config
	if err := config.Validate(cfg); err != nil {
		return fmt.Errorf("run: %w", err)
	}
	normalizedArtifacts, err := selectedArtifacts.Normalize()
	if err != nil {
		return fmt.Errorf("run: invalid --artifacts: %w", err)
	}
	effectiveArtifacts, err := resolveEffectiveArtifacts(cfg, normalizedArtifacts)
	if err != nil {
		return fmt.Errorf("run: %w", err)
	}
	stages := BuildFullPlan()
	summary, err := executeStagesFn(ctx, cfg, stages, RunOptions{
		Force:              force,
		SelectedArtifacts:  normalizedArtifacts,
		EffectiveArtifacts: effectiveArtifacts,
	})
	if err != nil {
		return fmt.Errorf("run: %w", err)
	}

	_, err = fmt.Fprintf(
		out,
		"narratio run: session %s; executed=%d skipped=%d; manifest=%s\n",
		summary.SessionID,
		len(summary.Executed),
		len(summary.Skipped),
		summary.ManifestPath,
	)
	return err
}