package config

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

func TestLoadAndValidate(t *testing.T) {
	tests := []struct {
		name         string
		pipelineYAML string
		sessionYAML  string
		wantLoadErr  string
		wantValidate string
		checkDefault bool
		wantRoot     string
	}{
		{
			name: "valid minimal config",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  binary: audita
notification:
  timeout: 15s
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			checkDefault: true,
			wantRoot:     "/tmp/narratio",
		},
		{
			name: "seriatim and audita sections can be omitted",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
notification:
  timeout: 15s
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			checkDefault: true,
			wantRoot:     "/tmp/narratio",
		},
		{
			name: "workspace root defaults when omitted",
			pipelineYAML: `whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
notification:
  timeout: 15s
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			checkDefault: true,
			wantRoot:     DefaultWorkspaceRoot,
		},
		{
			name: "unknown pipeline field fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
bogus: true
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantLoadErr: "pipeline file",
		},
		{
			name: "legacy analyzer section fails strict decode",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
analyzer:
  timeout: 20m
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantLoadErr: "strict decode failed",
		},
		{
			name: "unknown whisperx field fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
  bogus: true
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantLoadErr: "strict decode failed",
		},
		{
			name: "unknown secrets field fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
secrets:
  bogus: true
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantLoadErr: "strict decode failed",
		},
		{
			name: "empty secrets env_dir fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
secrets:
  env_dir: "   "
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.secrets.env_dir must be non-empty when pipeline.secrets is configured",
		},
		{
			name: "unknown session field fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
unknown_field: true
`,
			wantLoadErr: "session file",
		},
		{
			name: "missing required field fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
`,
			sessionYAML: `session_id: ""
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "session config \"session.yml\" invalid: session.session_id is required",
		},
		{
			name: "valid previous_session_id passes",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
`,
			sessionYAML: `session_id: 2026-05-03
previous_session_id: 2026-04-26
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
		},
		{
			name: "previous_session_id equal to session_id fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
`,
			sessionYAML: `session_id: 2026-05-03
previous_session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "session config \"session.yml\" invalid: session.previous_session_id must not equal session.session_id",
		},
		{
			name: "missing transcribe_url fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
seriatim:
  binary: seriatim
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.whisperx.transcribe_url is required",
		},
		{
			name: "invalid transcribe_url fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: ://
seriatim:
  binary: seriatim
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.whisperx.transcribe_url must be a valid URL",
		},
		{
			name: "invalid timeout fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
  timeout: definitely-not-a-duration
seriatim:
  binary: seriatim
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.whisperx.timeout must be a valid duration",
		},
		{
			name: "invalid retry_delay fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
  retry_delay: not-a-duration
seriatim:
  binary: seriatim
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.whisperx.retry_delay must be a valid duration",
		},
		{
			name: "negative retries fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
  retries: -1
seriatim:
  binary: seriatim
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.whisperx.retries must be >= 0",
		},
		{
			name: "invalid concurrency fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
  concurrency: 0
seriatim:
  binary: seriatim
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.whisperx.concurrency must be > 0",
		},
		{
			name: "unknown seriatim field fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
  bogus: true
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantLoadErr: "strict decode failed",
		},
		{
			name: "unknown seriatim env field fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
  env:
    unknown_knob: 1.0
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantLoadErr: "strict decode failed",
		},
		{
			name: "missing seriatim binary uses default",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  timeout: 10m
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
		},
		{
			name: "invalid seriatim timeout fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
  timeout: not-a-duration
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.seriatim.timeout must be a valid duration",
		},
		{
			name: "invalid seriatim output schema fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
  output_schema: invalid-schema
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.seriatim.output_schema must be one of: seriatim-minimal, seriatim-intermediate, seriatim-full",
		},
		{
			name: "negative seriatim coalesce gap fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
  coalesce_gap: -0.1
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.seriatim.coalesce_gap must be >= 0",
		},
		{
			name: "invalid seriatim env float fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
  env:
    overlap_word_run_gap: 0
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.seriatim.env.overlap_word_run_gap must be > 0 when provided",
		},
		{
			name: "unknown audita field fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  binary: audita
  bogus: true
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantLoadErr: "strict decode failed",
		},
		{
			name: "missing audita binary uses default",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  timeout: 3h
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
		},
		{
			name: "invalid audita timeout fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  binary: audita
  timeout: bad-timeout
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.audita.timeout must be a valid duration",
		},
		{
			name: "empty audita modules is valid override",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  binary: audita
  modules: []
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
		},
		{
			name: "empty audita module item fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  binary: audita
  modules:
    - glossary
    - ""
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.audita.modules[1] must be non-empty",
		},
		{
			name: "invalid audita module item fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  binary: audita
  modules:
    - glossary
    - bad_module
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.audita.modules[1] must be one of: glossary, homophones, spoken_word, grammar",
		},
		{
			name: "invalid audita base_url fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  binary: audita
  base_url: ://
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.audita.base_url must be a valid URL",
		},
		{
			name: "legacy audita llm_concurrency field fails strict decode",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  binary: audita
  llm_concurrency: 1
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantLoadErr: "strict decode failed",
		},
		{
			name: "invalid audita total_llm_concurrency fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  binary: audita
  total_llm_concurrency: 0
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.audita.total_llm_concurrency must be > 0",
		},
		{
			name: "invalid audita proposal_llm_concurrency fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  binary: audita
  proposal_llm_concurrency: 0
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.audita.proposal_llm_concurrency must be > 0",
		},
		{
			name: "invalid audita validation_llm_concurrency fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  binary: audita
  validation_llm_concurrency: 0
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.audita.validation_llm_concurrency must be > 0",
		},
		{
			name: "invalid audita output_schema fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  binary: audita
  output_schema: bad
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.audita.output_schema must be one of: bare-segments, audita-v1",
		},
		{
			name: "invalid audita work_dir_retention fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
seriatim:
  binary: seriatim
audita:
  binary: audita
  work_dir_retention: sometimes
`,
			sessionYAML: `session_id: 2026-05-03
inputs:
  audio_dir: ./audio
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`,
			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.audita.work_dir_retention must be one of: always, auto, never",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			pipelinePath, sessionPath := writeConfigFiles(t, tt.pipelineYAML, tt.sessionYAML)

			cfg, err := Load(pipelinePath, sessionPath)
			if tt.wantLoadErr != "" {
				if err == nil {
					t.Fatalf("expected load error containing %q, got nil", tt.wantLoadErr)
				}
				if !strings.Contains(err.Error(), tt.wantLoadErr) {
					t.Fatalf("load error = %q, want to contain %q", err.Error(), tt.wantLoadErr)
				}
				if !strings.Contains(err.Error(), "strict decode failed") {
					t.Fatalf("load error = %q, want strict decode context", err.Error())
				}
				return
			}

			if err != nil {
				t.Fatalf("Load() error = %v", err)
			}
			if cfg.PipelinePath != pipelinePath {
				t.Fatalf("PipelinePath = %q, want %q", cfg.PipelinePath, pipelinePath)
			}
			if cfg.SessionPath != sessionPath {
				t.Fatalf("SessionPath = %q, want %q", cfg.SessionPath, sessionPath)
			}
			if tt.checkDefault {
				if tt.wantRoot != "" && cfg.Pipeline.Workspace.Root != tt.wantRoot {
					t.Fatalf("workspace.root = %q, want %q", cfg.Pipeline.Workspace.Root, tt.wantRoot)
				}
				if cfg.Pipeline.WhisperX.Language != "en" {
					t.Fatalf("whisperx.language = %q, want %q", cfg.Pipeline.WhisperX.Language, "en")
				}
				if cfg.Pipeline.WhisperX.Timeout != "30m" {
					t.Fatalf("whisperx.timeout = %q, want %q", cfg.Pipeline.WhisperX.Timeout, "30m")
				}
				if cfg.Pipeline.WhisperX.RetryDelay != "2s" {
					t.Fatalf("whisperx.retry_delay = %q, want %q", cfg.Pipeline.WhisperX.RetryDelay, "2s")
				}
				if cfg.Pipeline.WhisperX.Retries == nil || *cfg.Pipeline.WhisperX.Retries != 3 {
					t.Fatalf("whisperx.retries = %v, want 3", cfg.Pipeline.WhisperX.Retries)
				}
				if cfg.Pipeline.WhisperX.Concurrency == nil || *cfg.Pipeline.WhisperX.Concurrency != 2 {
					t.Fatalf("whisperx.concurrency = %v, want 2", cfg.Pipeline.WhisperX.Concurrency)
				}
				if cfg.Pipeline.Seriatim.Timeout != "10m" {
					t.Fatalf("seriatim.timeout = %q, want %q", cfg.Pipeline.Seriatim.Timeout, "10m")
				}
				if cfg.Pipeline.Seriatim.Binary != "seriatim" {
					t.Fatalf("seriatim.binary = %q, want %q", cfg.Pipeline.Seriatim.Binary, "seriatim")
				}
				if cfg.Pipeline.Seriatim.OutputSchema != "seriatim-intermediate" {
					t.Fatalf("seriatim.output_schema = %q, want %q", cfg.Pipeline.Seriatim.OutputSchema, "seriatim-intermediate")
				}
				if cfg.Pipeline.Seriatim.CoalesceGap == nil || *cfg.Pipeline.Seriatim.CoalesceGap != 3.0 {
					t.Fatalf("seriatim.coalesce_gap = %v, want 3.0", cfg.Pipeline.Seriatim.CoalesceGap)
				}
				if cfg.Pipeline.Seriatim.Report == nil || *cfg.Pipeline.Seriatim.Report != true {
					t.Fatalf("seriatim.report = %v, want true", cfg.Pipeline.Seriatim.Report)
				}
				if cfg.Pipeline.Audita.Timeout != "3h" {
					t.Fatalf("audita.timeout = %q, want %q", cfg.Pipeline.Audita.Timeout, "3h")
				}
				if cfg.Pipeline.Audita.Binary != "audita" {
					t.Fatalf("audita.binary = %q, want %q", cfg.Pipeline.Audita.Binary, "audita")
				}
				if cfg.Pipeline.Audita.LLMAPIKeyEnv != "" {
					t.Fatalf("audita.llm_api_key_env = %q, want empty by default", cfg.Pipeline.Audita.LLMAPIKeyEnv)
				}
				if cfg.Pipeline.Audita.Modules != nil {
					t.Fatalf("audita.modules = %#v, want nil default (optional override)", cfg.Pipeline.Audita.Modules)
				}
				if cfg.Pipeline.Audita.BaseURL != "" {
					t.Fatalf("audita.base_url = %q, want empty default", cfg.Pipeline.Audita.BaseURL)
				}
				if cfg.Pipeline.Audita.Model != "" {
					t.Fatalf("audita.model = %q, want empty default", cfg.Pipeline.Audita.Model)
				}
				if cfg.Pipeline.Audita.ValidationModel != "" {
					t.Fatalf("audita.validation_model = %q, want empty default", cfg.Pipeline.Audita.ValidationModel)
				}
				if cfg.Pipeline.Audita.TotalLLMConcurrency != nil {
					t.Fatalf("audita.total_llm_concurrency = %v, want nil default", cfg.Pipeline.Audita.TotalLLMConcurrency)
				}
				if cfg.Pipeline.Audita.ProposalLLMConcurrency != nil {
					t.Fatalf("audita.proposal_llm_concurrency = %v, want nil default", cfg.Pipeline.Audita.ProposalLLMConcurrency)
				}
				if cfg.Pipeline.Audita.ValidationLLMConcurrency != nil {
					t.Fatalf("audita.validation_llm_concurrency = %v, want nil default", cfg.Pipeline.Audita.ValidationLLMConcurrency)
				}
				if cfg.Pipeline.Audita.Report == nil || *cfg.Pipeline.Audita.Report != true {
					t.Fatalf("audita.report = %v, want true", cfg.Pipeline.Audita.Report)
				}
				if cfg.Pipeline.Normalize == nil {
					t.Fatal("normalize config should be present via defaults")
				}
				if cfg.Pipeline.Normalize.OutputPath != "transcripts/final.json" {
					t.Fatalf("normalize.output_path = %q, want %q", cfg.Pipeline.Normalize.OutputPath, "transcripts/final.json")
				}
				if cfg.Pipeline.Normalize.OutputSchema != "seriatim-intermediate" {
					t.Fatalf("normalize.output_schema = %q, want %q", cfg.Pipeline.Normalize.OutputSchema, "seriatim-intermediate")
				}
				if cfg.Pipeline.Normalize.Report == nil || *cfg.Pipeline.Normalize.Report != true {
					t.Fatalf("normalize.report = %v, want true", cfg.Pipeline.Normalize.Report)
				}
			}

			err = Validate(cfg)
			if tt.wantValidate != "" {
				if err == nil {
					t.Fatalf("expected validation error containing %q, got nil", tt.wantValidate)
				}
				if !strings.Contains(err.Error(), tt.wantValidate) {
					t.Fatalf("validation error = %q, want to contain %q", err.Error(), tt.wantValidate)
				}
				return
			}
			if err != nil {
				t.Fatalf("Validate() error = %v", err)
			}
		})
	}
}

func TestValidateMissingAudioSource(t *testing.T) {
	retries := 3
	concurrency := 2
	cfg := &Config{
		Pipeline: &PipelineConfig{
			Workspace: WorkspaceConfig{Root: "/tmp/narratio"},
			WhisperX: WhisperXConfig{
				TranscribeURL: "https://transcription.ai.rakestrawhome.com/transcribe",
				Language:      "en",
				Timeout:       "30m",
				Retries:       &retries,
				RetryDelay:    "2s",
				Concurrency:   &concurrency,
			},
			Seriatim: SeriatimConfig{
				Binary:       "seriatim",
				Timeout:      "10m",
				OutputSchema: "seriatim-intermediate",
				CoalesceGap:  float64Ptr(3.0),
				Report:       boolPtr(true),
			},
			Audita: AuditaConfig{
				Binary:                   "audita",
				Timeout:                  "3h",
				LLMAPIKeyEnv:             "AUDITA_LLM_API_KEY",
				Modules:                  []string{"glossary", "homophones"},
				BaseURL:                  "https://openrouter.ai/api/v1",
				Model:                    "openrouter/google/gemma-4-31b-it",
				TotalLLMConcurrency:      intPtr(1),
				ProposalLLMConcurrency:   intPtr(1),
				ValidationModel:          "",
				ValidationLLMConcurrency: intPtr(1),
				Report:                   boolPtr(true),
			},
		},
		Campaign: &CampaignConfig{Campaign: "sample-campaign"},
		Session: &SessionConfig{
			SessionID: "2026-05-03",
			Campaign:  "sample-campaign",
			Inputs: SessionInputsConfig{
				SpeakersFile:    "speakers.yml",
				AutocorrectFile: "autocorrect.yml",
				GlossaryFile:    "glossary.yml",
			},
		},
	}

	err := Validate(cfg)
	if err == nil {
		t.Fatal("expected validation error, got nil")
	}
	if !strings.Contains(err.Error(), "audio_dir, at least one audio_files entry, or audio_s3") {
		t.Fatalf("error = %q, want audio source guidance", err.Error())
	}
	if !strings.Contains(err.Error(), "session config") {
		t.Fatalf("error = %q, want session config context", err.Error())
	}
}

func TestExamplesLoadAndValidate(t *testing.T) {
	examplesDir := filepath.Join("..", "..", "examples")
	tests := []struct {
		name         string
		pipelineFile string
		sessionFile  string
	}{
		{
			name:         "minimal pipeline with local audio session",
			pipelineFile: "pipeline.minimal.yml",
			sessionFile:  "session.local-audio.yml",
		},
		{
			name:         "production pipeline with s3 audio session",
			pipelineFile: "pipeline.production.yml",
			sessionFile:  "session.s3-audio.yml",
		},
		{
			name:         "full annotated pipeline with local audio session",
			pipelineFile: "pipeline.full.annotated.yml",
			sessionFile:  "session.local-audio.yml",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			pipelinePath := filepath.Join(examplesDir, tt.pipelineFile)
			campaignPath := filepath.Join(examplesDir, "campaign.yml")
			sessionPath := filepath.Join(examplesDir, tt.sessionFile)

			cfg, err := Load(pipelinePath, campaignPath, sessionPath)
			if err != nil {
				t.Fatalf("load example config error = %v", err)
			}
			if err := Validate(cfg); err != nil {
				t.Fatalf("validate example config error = %v", err)
			}
		})
	}
}

func writeConfigFiles(t *testing.T, pipelineYAML, sessionYAML string) (string, string) {
	t.Helper()
	if !strings.Contains(pipelineYAML, "\naudita:") && !strings.HasPrefix(pipelineYAML, "audita:") {
		if !strings.HasSuffix(pipelineYAML, "\n") {
			pipelineYAML += "\n"
		}
		pipelineYAML += "audita:\n  binary: audita\n"
	}
	if !strings.Contains(sessionYAML, "\ncampaign:") && !strings.HasPrefix(sessionYAML, "campaign:") {
		if !strings.HasSuffix(sessionYAML, "\n") {
			sessionYAML += "\n"
		}
		sessionYAML += "campaign: sample-campaign\n"
	}

	dir := t.TempDir()
	pipelinePath := filepath.Join(dir, "pipeline.yml")
	campaignPath := filepath.Join(dir, "campaign.yml")
	sessionPath := filepath.Join(dir, "session.yml")

	if err := os.WriteFile(pipelinePath, []byte(pipelineYAML), 0o644); err != nil {
		t.Fatalf("write pipeline.yml: %v", err)
	}
	campaignYAML := `campaign: ` + campaignNameFromSessionYAML(sessionYAML) + `
inputs:
  speakers_file: ./speakers.yml
  autocorrect_file: ./autocorrect.yml
  glossary_file: ./glossary.yml
`
	if err := os.WriteFile(campaignPath, []byte(campaignYAML), 0o644); err != nil {
		t.Fatalf("write campaign.yml: %v", err)
	}
	if err := os.WriteFile(sessionPath, []byte(sessionYAML), 0o644); err != nil {
		t.Fatalf("write session.yml: %v", err)
	}

	return pipelinePath, sessionPath
}

func campaignNameFromSessionYAML(sessionYAML string) string {
	for _, line := range strings.Split(sessionYAML, "\n") {
		trimmed := strings.TrimSpace(line)
		if strings.HasPrefix(trimmed, "campaign:") {
			return strings.Trim(strings.TrimSpace(strings.TrimPrefix(trimmed, "campaign:")), `"'`)
		}
	}
	return "sample-campaign"
}