package config

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

func TestCampaignConfigDefaultSearchOrder(t *testing.T) {
	want := []string{
		"/usr/local/etc/narratio/campaign.yml",
		"/etc/narratio/campaign.yml",
	}
	if len(DefaultCampaignConfigSearchPaths) != len(want) {
		t.Fatalf("DefaultCampaignConfigSearchPaths = %#v, want %#v", DefaultCampaignConfigSearchPaths, want)
	}
	for i := range want {
		if DefaultCampaignConfigSearchPaths[i] != want[i] {
			t.Fatalf("DefaultCampaignConfigSearchPaths[%d] = %q, want %q", i, DefaultCampaignConfigSearchPaths[i], want[i])
		}
	}
}

func TestCampaignStrictDecodeRejectsUnknownFields(t *testing.T) {
	pipelinePath, campaignPath, sessionPath := writeCampaignConfigTestFiles(t,
		"campaign: sample-campaign\nunknown: true\ninputs:\n  speakers_file: ./speakers.yml\n  autocorrect_file: ./autocorrect.yml\n  glossary_file: ./glossary.yml\n",
		"session_id: 2026-05-03\ninputs:\n  audio_dir: ./audio\n",
	)

	_, err := LoadWithSessionOptions(pipelinePath, campaignPath, sessionPath, SessionLoadOptions{})
	if err == nil {
		t.Fatal("expected load error, got nil")
	}
	if !strings.Contains(err.Error(), "campaign file") || !strings.Contains(err.Error(), "strict decode failed") {
		t.Fatalf("error = %q, want campaign strict decode context", err.Error())
	}
}

func TestCampaignSessionMergeFillsStableInputs(t *testing.T) {
	pipelinePath, campaignPath, sessionPath := writeCampaignConfigTestFiles(t,
		"campaign: sample-campaign\ninputs:\n  speakers_file: ./campaign-speakers.yml\n  autocorrect_file: ./campaign-autocorrect.yml\n  glossary_file: ./campaign-glossary.yml\n",
		"session_id: 2026-05-03\ninputs:\n  audio_dir: ./audio\n",
	)

	cfg, err := LoadWithSessionOptions(pipelinePath, campaignPath, sessionPath, SessionLoadOptions{})
	if err != nil {
		t.Fatalf("LoadWithSessionOptions() error = %v", err)
	}
	if err := Validate(cfg); err != nil {
		t.Fatalf("Validate() error = %v", err)
	}
	if cfg.Session.Campaign != "sample-campaign" {
		t.Fatalf("session campaign = %q, want campaign config value", cfg.Session.Campaign)
	}
	assertResolvedStableInput(t, cfg.StableInputs.SpeakersFile, "./campaign-speakers.yml", campaignPath, "campaign_config")
	assertResolvedStableInput(t, cfg.StableInputs.AutocorrectFile, "./campaign-autocorrect.yml", campaignPath, "campaign_config")
	assertResolvedStableInput(t, cfg.StableInputs.GlossaryFile, "./campaign-glossary.yml", campaignPath, "campaign_config")
}

func TestCampaignSessionMergeSessionOverridesStableInputs(t *testing.T) {
	pipelinePath, campaignPath, sessionPath := writeCampaignConfigTestFiles(t,
		"campaign: sample-campaign\ninputs:\n  speakers_file: ./campaign-speakers.yml\n  autocorrect_file: ./campaign-autocorrect.yml\n  glossary_file: ./campaign-glossary.yml\n",
		"session_id: 2026-05-03\ncampaign: sample-campaign\ninputs:\n  audio_dir: ./audio\n  speakers_file: ./session-speakers.yml\n",
	)

	cfg, err := LoadWithSessionOptions(pipelinePath, campaignPath, sessionPath, SessionLoadOptions{})
	if err != nil {
		t.Fatalf("LoadWithSessionOptions() error = %v", err)
	}
	if err := Validate(cfg); err != nil {
		t.Fatalf("Validate() error = %v", err)
	}
	assertResolvedStableInput(t, cfg.StableInputs.SpeakersFile, "./session-speakers.yml", sessionPath, "session_config")
	assertResolvedStableInput(t, cfg.StableInputs.AutocorrectFile, "./campaign-autocorrect.yml", campaignPath, "campaign_config")
	assertResolvedStableInput(t, cfg.StableInputs.GlossaryFile, "./campaign-glossary.yml", campaignPath, "campaign_config")
}

func TestCampaignSessionMismatchFails(t *testing.T) {
	pipelinePath, campaignPath, sessionPath := writeCampaignConfigTestFiles(t,
		"campaign: sample-campaign\ninputs:\n  speakers_file: ./speakers.yml\n  autocorrect_file: ./autocorrect.yml\n  glossary_file: ./glossary.yml\n",
		"session_id: 2026-05-03\ncampaign: other-campaign\ninputs:\n  audio_dir: ./audio\n",
	)

	_, err := LoadWithSessionOptions(pipelinePath, campaignPath, sessionPath, SessionLoadOptions{})
	if err == nil {
		t.Fatal("expected load error, got nil")
	}
	if !strings.Contains(err.Error(), "does not match campaign config") {
		t.Fatalf("error = %q, want campaign mismatch context", err.Error())
	}
}

func TestLoadMissingCampaignFileFails(t *testing.T) {
	pipelinePath, _, sessionPath := writeCampaignConfigTestFiles(t,
		"campaign: sample-campaign\ninputs:\n  speakers_file: ./speakers.yml\n  autocorrect_file: ./autocorrect.yml\n  glossary_file: ./glossary.yml\n",
		"session_id: 2026-05-03\ninputs:\n  audio_dir: ./audio\n",
	)
	missingCampaignPath := filepath.Join(filepath.Dir(sessionPath), "missing-campaign.yml")

	_, err := LoadWithSessionOptions(pipelinePath, missingCampaignPath, sessionPath, SessionLoadOptions{})
	if err == nil {
		t.Fatal("expected load error, got nil")
	}
	if !strings.Contains(err.Error(), "load campaign config") {
		t.Fatalf("error = %q, want campaign load context", err.Error())
	}
}

func writeCampaignConfigTestFiles(t *testing.T, campaignYAML, sessionYAML string) (string, string, string) {
	t.Helper()

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

	pipelineYAML := "workspace:\n  root: " + filepath.ToSlash(filepath.Join(dir, "work")) + "\nwhisperx:\n  transcribe_url: https://example.com/transcribe\nanalyzer:\n  timeout: 20m\nnotification:\n  timeout: 10s\n"
	if err := os.WriteFile(pipelinePath, []byte(pipelineYAML), 0o644); err != nil {
		t.Fatalf("write pipeline.yml: %v", err)
	}
	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, campaignPath, sessionPath
}

func assertResolvedStableInput(t *testing.T, got ResolvedInputFile, wantPath, wantConfigPath, wantSource string) {
	t.Helper()
	if got.Path != wantPath || got.ConfigPath != wantConfigPath || got.Source != wantSource {
		t.Fatalf("resolved input = %#v, want path=%q config_path=%q source=%q", got, wantPath, wantConfigPath, wantSource)
	}
}