package app

import (
	"context"
	"io"
	"os"
	"path/filepath"
	"strings"
	"testing"

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

func TestRunOverlaySelectionFlowsThroughSharedLoader(t *testing.T) {
	workspaceRoot := t.TempDir()
	pipelinePath, campaignPath, sessionPath := writeValidConfigFiles(t, workspaceRoot)
	enableCommandTestOverlays(t, pipelinePath)

	var language string
	executor := func(_ context.Context, cfg *config.Config, _ BoundedPlan, _ RunOptions) (*RunSummary, error) {
		language = cfg.Pipeline.WhisperX.Language
		return &RunSummary{SessionID: cfg.Session.SessionID, ManifestPath: "manifest.json"}, nil
	}

	if err := runWithPipelineExecutor(context.Background(), []string{
		"2026-05-03", "--config", pipelinePath, "--campaign-file", campaignPath, "--session", sessionPath, "--overlay", "testing",
	}, io.Discard, executor); err != nil {
		t.Fatal(err)
	}
	if language != "fr" {
		t.Fatalf("explicit overlay language = %q, want fr", language)
	}
	if err := runWithPipelineExecutor(context.Background(), []string{
		"2026-05-03", "--config", pipelinePath, "--campaign-file", campaignPath, "--session", sessionPath, "--profile", "testing",
	}, io.Discard, executor); err == nil {
		t.Fatal("retired pipeline selector was accepted")
	}

	if err := runWithPipelineExecutor(context.Background(), []string{
		"2026-05-03", "--config", pipelinePath, "--campaign-file", campaignPath, "--session", sessionPath,
	}, io.Discard, executor); err != nil {
		t.Fatal(err)
	}
	if language != "en" {
		t.Fatalf("base configuration language = %q, want en", language)
	}

	for _, overlay := range []string{"unknown"} {
		err := runWithPipelineExecutor(context.Background(), []string{
			"2026-05-03", "--config", pipelinePath, "--campaign-file", campaignPath, "--session", sessionPath, "--overlay", overlay,
		}, io.Discard, executor)
		if err == nil || !strings.Contains(err.Error(), "overlay") {
			t.Fatalf("overlay %q error = %v, want selection rejection", overlay, err)
		}
	}

	if err := runWithPipelineExecutor(context.Background(), []string{
		"2026-05-03", "--config", pipelinePath, "--campaign-file", campaignPath, "--session", sessionPath, "--overlay", "",
	}, io.Discard, executor); err != nil {
		t.Fatalf("explicit empty overlay should select base: %v", err)
	}
}

func enableCommandTestOverlays(t *testing.T, pipelinePath string) {
	t.Helper()
	dir := filepath.Join(filepath.Dir(pipelinePath), "overlays")
	if err := os.MkdirAll(dir, 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(dir, "production.yml"), []byte("whisperx:\n  language: en\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(dir, "testing.yml"), []byte("whisperx:\n  language: fr\n"), 0o644); err != nil {
		t.Fatal(err)
	}
}