package settings

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

func TestSaveLoadRoundTrip(t *testing.T) {
	path := filepath.Join(t.TempDir(), "settings.json")
	want := Settings{AIBackend: "codex", MarvinCmd: "uv run am", KnowledgePath: "/tmp/k.md", AWURL: "http://aw.local:5600"}
	if err := Save(path, want); err != nil {
		t.Fatalf("save: %v", err)
	}
	got, err := Load(path)
	if err != nil {
		t.Fatalf("load: %v", err)
	}
	if got != want {
		t.Errorf("round trip = %+v, want %+v", got, want)
	}
}

func TestLoadMissingFileIsError(t *testing.T) {
	_, err := Load(filepath.Join(t.TempDir(), "nope.json"))
	if err == nil {
		t.Fatal("want error loading missing file, got nil")
	}
}

func TestSeedFromEnvReadsVars(t *testing.T) {
	t.Setenv("KEEL_AI_BACKEND", "codex")
	t.Setenv("KEEL_MARVIN_CMD", "uv run am")
	t.Setenv("KEEL_KNOWLEDGE_FILE", "/tmp/k.md")
	t.Setenv("KEEL_AW_URL", "http://aw.local:5600")
	t.Setenv("KEEL_AMBIENT_MODE", "")
	t.Setenv("KEEL_AMBIENT_CADENCE_SECS", "")
	got := SeedFromEnv()
	want := Settings{AIBackend: "codex", MarvinCmd: "uv run am", KnowledgePath: "/tmp/k.md", AWURL: "http://aw.local:5600", AmbientMode: AmbientNotify, AmbientCadenceSecs: 300}
	if got != want {
		t.Errorf("SeedFromEnv = %+v, want %+v", got, want)
	}
}

func TestSeedFromEnvDefaultsBackend(t *testing.T) {
	t.Setenv("KEEL_AI_BACKEND", "")
	t.Setenv("KEEL_MARVIN_CMD", "")
	t.Setenv("KEEL_KNOWLEDGE_FILE", "")
	got := SeedFromEnv()
	if got.AIBackend != "claude" {
		t.Errorf("default backend = %q, want claude", got.AIBackend)
	}
}

func TestSaveCreatesDir(t *testing.T) {
	path := filepath.Join(t.TempDir(), "sub", "settings.json")
	if err := Save(path, Settings{AIBackend: "claude"}); err != nil {
		t.Fatalf("save: %v", err)
	}
	if _, err := os.Stat(path); err != nil {
		t.Fatalf("file not written: %v", err)
	}
}

func TestSeedFromEnvAWURL(t *testing.T) {
	t.Setenv("KEEL_AW_URL", "http://aw.example:9999")
	if got := SeedFromEnv().AWURL; got != "http://aw.example:9999" {
		t.Fatalf("AWURL = %q", got)
	}
}

func TestSeedFromEnvAWURLDefault(t *testing.T) {
	t.Setenv("KEEL_AW_URL", "")
	if got := SeedFromEnv().AWURL; got != "http://localhost:5600" {
		t.Fatalf("default AWURL = %q", got)
	}
}

func TestValidAmbientMode(t *testing.T) {
	for _, m := range []string{AmbientOff, AmbientStatus, AmbientNotify} {
		if !ValidAmbientMode(m) {
			t.Fatalf("%q should be valid", m)
		}
	}
	if ValidAmbientMode("loud") {
		t.Fatal("loud should be invalid")
	}
	if ValidAmbientMode("") {
		t.Fatal("empty should be invalid (callers default before validating)")
	}
}

func TestSeedFromEnvAmbientDefaults(t *testing.T) {
	t.Setenv("KEEL_AMBIENT_MODE", "")
	t.Setenv("KEEL_AMBIENT_CADENCE_SECS", "")
	s := SeedFromEnv()
	if s.AmbientMode != AmbientNotify {
		t.Fatalf("ambient_mode default = %q, want %q", s.AmbientMode, AmbientNotify)
	}
	if s.AmbientCadenceSecs != 300 {
		t.Fatalf("ambient_cadence_secs default = %d, want 300", s.AmbientCadenceSecs)
	}
}

func TestSeedFromEnvAmbientFromEnv(t *testing.T) {
	t.Setenv("KEEL_AMBIENT_MODE", "status")
	t.Setenv("KEEL_AMBIENT_CADENCE_SECS", "120")
	s := SeedFromEnv()
	if s.AmbientMode != "status" || s.AmbientCadenceSecs != 120 {
		t.Fatalf("env not honored: mode=%q cadence=%d", s.AmbientMode, s.AmbientCadenceSecs)
	}
}