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
	}{
		{
			name: "valid minimal config",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  timeout: 10m
seriatim:
  timeout: 30s
audita:
  timeout: 1h
analyzer:
  timeout: 20m
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
`,
		},
		{
			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: "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
`,
			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: "invalid timeout fails",
			pipelineYAML: `workspace:
  root: /tmp/narratio
whisperx:
  timeout: definitely-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.whisperx.timeout must be a valid duration",
		},
	}

	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)
			}

			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) {
	cfg := &Config{
		Pipeline: &PipelineConfig{Workspace: WorkspaceConfig{Root: "/tmp/narratio"}},
		Session: &SessionConfig{
			SessionID: "2026-05-03",
			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 or at least one audio_files") {
		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) {
	pipelinePath := filepath.Join("..", "..", "examples", "pipeline.minimal.yml")
	sessionPath := filepath.Join("..", "..", "examples", "session.minimal.yml")

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

func writeConfigFiles(t *testing.T, pipelineYAML, sessionYAML string) (string, string) {
	t.Helper()

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

	if err := os.WriteFile(pipelinePath, []byte(pipelineYAML), 0o644); err != nil {
		t.Fatalf("write pipeline.yml: %v", err)
	}
	if err := os.WriteFile(sessionPath, []byte(sessionYAML), 0o644); err != nil {
		t.Fatalf("write session.yml: %v", err)
	}

	return pipelinePath, sessionPath
}