package config

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestPipelineConfigKitImportsProfileAndBaseSelection(t *testing.T) {
	dir := t.TempDir()
	writePipelineFixture(t, dir, "pipeline.yml", `configkit:
  imports:
    - path: config/workspace.yml
    - path: config/artifact.yml
whisperx:
  transcribe_url: https://transcription.example.test/transcribe
`)
	writePipelineFixture(t, dir, "config/workspace.yml", "workspace:\n  root: /srv/base\n")
	writePipelineFixture(t, dir, "config/artifact.yml", `scriptorium:
  artifacts:
    recap:
      enabled: false
      output_path: artifacts/recap.md
`)
	writePipelineFixture(t, dir, "profiles/testing.yml", "workspace:\n  root: /srv/testing\n")
	writePipelineFixture(t, dir, "profiles/unselected.yml", "unknown: [\n")

	root := filepath.Join(dir, "pipeline.yml")
	for _, profile := range []*string{nil, stringPointer(""), stringPointer("default")} {
		cfg, err := LoadPipelineWithOptions(root, PipelineLoadOptions{Profile: profile})
		if err != nil {
			t.Fatalf("load base selection %#v: %v", profile, err)
		}
		if cfg.Workspace.Root != "/srv/base" {
			t.Fatalf("base workspace = %q", cfg.Workspace.Root)
		}
	}
	selected := "testing"
	cfg, err := LoadPipelineWithOptions(root, PipelineLoadOptions{Profile: &selected})
	if err != nil {
		t.Fatal(err)
	}
	if cfg.Workspace.Root != "/srv/testing" || len(EffectivePipelineImports(cfg)) != 2 {
		t.Fatalf("profiled pipeline = %#v, imports=%#v", cfg.Workspace, EffectivePipelineImports(cfg))
	}
	profile, ok := SelectedPipelineProfile(cfg)
	if !ok || profile.Name != "testing" || profile.OverlayPath != filepath.Join(dir, "profiles", "testing.yml") {
		t.Fatalf("selected profile = %#v, %v", profile, ok)
	}
}

func TestPipelineConfigKitRejectsDuplicateBaseDeclarations(t *testing.T) {
	for _, test := range []struct {
		name, first, second, clearedContainer string
	}{
		{name: "artifact", first: "scriptorium:\n  artifacts:\n    recap:\n      prompt_id: recap\n", second: "scriptorium:\n  artifacts:\n    recap:\n      output_path: artifacts/recap.md\n", clearedContainer: "scriptorium:\n  artifacts: null\n"},
		{name: "artifact family", first: "scriptorium:\n  artifact_families:\n    recap:\n      for_each: party.characters\n", second: "scriptorium:\n  artifact_families:\n    recap:\n      output_path_pattern: artifacts/{character_id}.md\n", clearedContainer: "scriptorium:\n  artifact_families: null\n"},
	} {
		t.Run(test.name, func(t *testing.T) {
			dir := t.TempDir()
			writePipelineFixture(t, dir, "pipeline.yml", `configkit:
  imports:
    - path: first.yml
    - path: second.yml
whisperx:
  transcribe_url: https://transcription.example.test/transcribe
`)
			writePipelineFixture(t, dir, "first.yml", test.first)
			writePipelineFixture(t, dir, "second.yml", test.second)
			writePipelineFixture(t, dir, "profiles/clear-container.yml", test.clearedContainer)
			writePipelineFixture(t, dir, "profiles/clear-scriptorium.yml", "scriptorium: null\n")

			for _, profile := range []string{"", "clear-container", "clear-scriptorium"} {
				t.Run(profile, func(t *testing.T) {
					options := PipelineLoadOptions{}
					if profile != "" {
						options.Profile = &profile
					}
					_, err := LoadPipelineWithOptions(filepath.Join(dir, "pipeline.yml"), options)
					if err == nil || !strings.Contains(err.Error(), "declared by multiple base files") ||
						!strings.Contains(err.Error(), "first.yml") || !strings.Contains(err.Error(), "second.yml") {
						t.Fatalf("duplicate declaration error = %v", err)
					}
				})
			}
		})
	}
}

func TestPipelineConfigKitAllowsOneBaseDeclarationWithProfileOverride(t *testing.T) {
	dir := t.TempDir()
	writePipelineFixture(t, dir, "pipeline.yml", `configkit:
  imports:
    - path: artifact.yml
whisperx:
  transcribe_url: https://transcription.example.test/transcribe
`)
	writePipelineFixture(t, dir, "artifact.yml", "scriptorium:\n  artifacts:\n    recap:\n      prompt_id: base\n      output_path: artifacts/recap.md\n")
	writePipelineFixture(t, dir, "profiles/testing.yml", "scriptorium:\n  artifacts:\n    recap:\n      prompt_id: testing\n")
	profile := "testing"
	cfg, err := LoadPipelineWithOptions(filepath.Join(dir, "pipeline.yml"), PipelineLoadOptions{Profile: &profile})
	if err != nil {
		t.Fatal(err)
	}
	if got := cfg.Scriptorium.Artifacts["recap"].PromptID; got != "testing" {
		t.Fatalf("profile prompt = %q, want testing", got)
	}
}

func TestPipelineConfigKitRejectsUnknownDirectiveAlias(t *testing.T) {
	dir := t.TempDir()
	path := writePipelineFixture(t, dir, "pipeline.yml", "composition:\n  imports: []\n")
	_, err := LoadPipeline(path)
	if err == nil || !strings.Contains(err.Error(), "decode.unknown_field") {
		t.Fatalf("composition alias error = %v", err)
	}
}

func writePipelineFixture(t *testing.T, root, relative, contents string) string {
	t.Helper()
	path := filepath.Join(root, filepath.FromSlash(relative))
	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(path, []byte(contents), 0o644); err != nil {
		t.Fatal(err)
	}
	return path
}

func stringPointer(value string) *string { return &value }