package config

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

func writeConfig(t *testing.T, body string) string {
	t.Helper()
	p := filepath.Join(t.TempDir(), "mavend.json")
	if err := writeFile(t, p, body); err != nil {
		t.Fatalf("write config: %v", err)
	}
	return p
}

func TestLoadDefaults(t *testing.T) {
	p := writeConfig(t, `{}`)
	c, err := Load(p)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if time.Duration(c.TickInterval) != DefaultTickInterval {
		t.Errorf("TickInterval default = %v, want %v", c.TickInterval, DefaultTickInterval)
	}
	if time.Duration(c.RepeatInterval) != DefaultRepeatInterval {
		t.Errorf("RepeatInterval default = %v, want %v", c.RepeatInterval, DefaultRepeatInterval)
	}
	if c.DBPath == "" {
		t.Error("DBPath default not applied")
	}
	if c.SocketPath == "" {
		t.Error("SocketPath default not applied")
	}
}

// Nudges come from templates unless the config says otherwise.
func TestPhraserLLMNudgesDefaultsOff(t *testing.T) {
	p := writeConfig(t, `{"phraser":{"model_path":"/tmp/m.gguf"}}`)
	c, err := Load(p)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if c.Phraser.LLMNudges {
		t.Error("llm_nudges defaults on; templates must be the default")
	}

	p = writeConfig(t, `{"phraser":{"model_path":"/tmp/m.gguf","llm_nudges":true}}`)
	c, err = Load(p)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if !c.Phraser.LLMNudges {
		t.Error("llm_nudges:true did not parse")
	}
}

func TestLoadDurationsParse(t *testing.T) {
	p := writeConfig(t, `{"tick_interval":"90s","repeat_interval":"10m"}`)
	c, err := Load(p)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if time.Duration(c.TickInterval) != 90*time.Second {
		t.Errorf("TickInterval = %v, want 90s", c.TickInterval)
	}
	if time.Duration(c.RepeatInterval) != 10*time.Minute {
		t.Errorf("RepeatInterval = %v, want 10m", c.RepeatInterval)
	}
}

func TestLoadBadDurationRejected(t *testing.T) {
	p := writeConfig(t, `{"tick_interval":"not-a-duration"}`)
	if _, err := Load(p); err == nil {
		t.Fatal("Load succeeded for a bad duration; want error")
	}
}

func TestLoadMissingFile(t *testing.T) {
	p := filepath.Join(t.TempDir(), "nonexistent.json")
	if _, err := Load(p); err == nil {
		t.Fatal("Load succeeded for a missing file; want error")
	}
}

func TestVoiceEnabledRequiresBind(t *testing.T) {
	// enabled=true without bind is refused — the voice surface can't
	// default a bind (127.0.0.1 too relaxed for production, a wg addr is
	// the user's). surfacing the gap explicitly beats an idle listener.
	p := writeConfig(t, `{"voice":{"enabled":true}}`)
	if _, err := Load(p); err == nil {
		t.Fatal("Load succeeded for voice.enabled=true with no bind; want error")
	}
}

func TestVoiceEnabledWithBindOK(t *testing.T) {
	// voice surface fully configured — accepted (the daemon wires Stub tts +
	// voicesink; no models on disk required).
	p := writeConfig(t, `{"voice":{"enabled":true,"bind":"127.0.0.1:9100"}}`)
	if _, err := Load(p); err != nil {
		t.Fatalf("Load: %v", err)
	}
}

func TestEmbedderAllPathsSetOK(t *testing.T) {
	p := writeConfig(t, `{
		"voice": {
			"enabled": true, "bind": "127.0.0.1:9100",
			"embedder": {
				"model_path": "m.onnx",
				"tokenizer_path": "t.json",
				"lib_path": "l.so"
			}
		}
	}`)
	if _, err := Load(p); err != nil {
		t.Fatalf("Load: %v", err)
	}
}

func TestEmbedderPartialConfigRejected(t *testing.T) {
	tests := []struct {
		name string
		json string
	}{
		{"missing model_path", `{"voice":{"enabled":true,"bind":"127.0.0.1:9100","embedder":{"tokenizer_path":"t.json","lib_path":"l.so"}}}`},
		{"missing tokenizer_path", `{"voice":{"enabled":true,"bind":"127.0.0.1:9100","embedder":{"model_path":"m.onnx","lib_path":"l.so"}}}`},
		{"missing lib_path", `{"voice":{"enabled":true,"bind":"127.0.0.1:9100","embedder":{"model_path":"m.onnx","tokenizer_path":"t.json"}}}`},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			p := writeConfig(t, tt.json)
			if _, err := Load(p); err == nil {
				t.Fatal("Load succeeded for partial embedder; want error")
			}
		})
	}
}

func TestEmbedderNilOK(t *testing.T) {
	// voice block without embedder → ok (HashEmbedder floor)
	p := writeConfig(t, `{"voice":{"enabled":true,"bind":"127.0.0.1:9100"}}`)
	if _, err := Load(p); err != nil {
		t.Fatalf("Load: %v", err)
	}
}

func TestVoicePresentDisabledOK(t *testing.T) {
	// voice block present but not enabled — acceptable (the listener stays
	// down; the routing table's ChannelVoice selections drop).
	p := writeConfig(t, `{"voice":{"enabled":false}}`)
	if _, err := Load(p); err != nil {
		t.Fatalf("Load: %v", err)
	}
}

func TestVoiceSttTtsConfigParsed(t *testing.T) {
	// the stt/tts worker sub-blocks parse + remember socket/lang.
	p := writeConfig(t, `{
		"voice": {
			"enabled": true, "bind": "127.0.0.1:9100",
			"stt": {"socket": "/tmp/stt.sock", "lang": "ru"},
			"tts": {"socket": "/tmp/tts.sock", "lang": "ru", "voice": "natasha"}
		}
	}`)
	c, err := Load(p)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if c.Voice.Stt == nil || c.Voice.Stt.Socket != "/tmp/stt.sock" {
		t.Fatalf("Stt config not parsed: %+v", c.Voice)
	}
	if c.Voice.Tts == nil || c.Voice.Tts.Socket != "/tmp/tts.sock" || c.Voice.Tts.Voice != "natasha" {
		t.Fatalf("Tts config not parsed: %+v", c.Voice)
	}
}

func TestWeatherConfig(t *testing.T) {
	// Weather block with provider + default location → OK
	p := writeConfig(t, `{"voice":{"enabled":true,"bind":"127.0.0.1:9100","weather":{"provider":"open-meteo","default_location":"Moscow"}}}`)
	if _, err := Load(p); err != nil {
		t.Fatalf("Load with weather config: %v", err)
	}
}

func TestWeatherConfigNilOK(t *testing.T) {
	// No weather block → OK (stub)
	p := writeConfig(t, `{"voice":{"enabled":true,"bind":"127.0.0.1:9100"}}`)
	if _, err := Load(p); err != nil {
		t.Fatalf("Load without weather config: %v", err)
	}
}

func TestLLMRouterDefaultsOn(t *testing.T) {
	p := writeConfig(t, `{"voice":{"enabled":true,"bind":"127.0.0.1:9100"}}`)
	c, err := Load(p)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if !c.Voice.UseLLMRouter() {
		t.Error("voice.llm_router absent should mean on")
	}
}

// Missing and explicitly false must not mean the same thing.
func TestLLMRouterExplicitFalseTurnsItOff(t *testing.T) {
	p := writeConfig(t, `{"voice":{"enabled":true,"bind":"127.0.0.1:9100","llm_router":false}}`)
	c, err := Load(p)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if c.Voice.UseLLMRouter() {
		t.Error("voice.llm_router false should turn it off")
	}
}

func TestLLMRouterRead(t *testing.T) {
	p := writeConfig(t, `{"voice":{"enabled":true,"bind":"127.0.0.1:9100","llm_router":true}}`)
	c, err := Load(p)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if !c.Voice.UseLLMRouter() {
		t.Error("voice.llm_router true was not read")
	}
}

func TestDurationRoundTrip(t *testing.T) {
	d := Duration(15 * time.Minute)
	b, err := d.MarshalJSON()
	if err != nil {
		t.Fatalf("MarshalJSON: %v", err)
	}
	if got, want := string(b), `"15m0s"`; got != want {
		t.Errorf("MarshalJSON = %s, want %s", got, want)
	}
	var d2 Duration
	if err := d2.UnmarshalJSON(b); err != nil {
		t.Fatalf("UnmarshalJSON: %v", err)
	}
	if d2 != d {
		t.Errorf("round-trip = %v, want %v", d2, d)
	}
}

// Both new opt-in capabilities follow the same rule: absent block ⇒ nil ⇒ the
// behaviour does not exist. Presence is the enable act, so a bare `{}` block is
// valid and gets the defaults filled in.
func TestOptInBlocksAbsentStayNil(t *testing.T) {
	c, err := Load(writeConfig(t, `{}`))
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if c.PatternProposals != nil {
		t.Errorf("pattern_proposals absent but got %+v", c.PatternProposals)
	}
	if c.PatternProposals.AnnounceProposals() {
		t.Error("AnnounceProposals() true with no config block")
	}
	if c.MemoryEval != nil {
		t.Errorf("memory_eval absent but got %+v", c.MemoryEval)
	}
}

func TestOptInBlocksGetDefaultsWhenPresent(t *testing.T) {
	c, err := Load(writeConfig(t, `{"pattern_proposals":{"notify":true},"memory_eval":{}}`))
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if !c.PatternProposals.AnnounceProposals() {
		t.Error("notify:true did not enable announcements")
	}
	if time.Duration(c.PatternProposals.Cooldown) != DefaultProposalCooldown {
		t.Errorf("proposal cooldown = %v, want %v", c.PatternProposals.Cooldown, DefaultProposalCooldown)
	}
	if time.Duration(c.MemoryEval.Interval) != DefaultMemoryEvalInterval {
		t.Errorf("memory eval interval = %v, want %v", c.MemoryEval.Interval, DefaultMemoryEvalInterval)
	}
}

// Notify is off even when the block exists — the block is where you tune it,
// notify:true is the act that lets her speak.
func TestPatternProposalNotifyDefaultsOff(t *testing.T) {
	c, err := Load(writeConfig(t, `{"pattern_proposals":{"cooldown":"6h"}}`))
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if c.PatternProposals.AnnounceProposals() {
		t.Error("notify defaulted to on")
	}
	if time.Duration(c.PatternProposals.Cooldown) != 6*time.Hour {
		t.Errorf("cooldown = %v, want 6h", c.PatternProposals.Cooldown)
	}
}

// TestSwapModelsAbsentMeansOff — the swap capability does not exist unless the
// operator lists the models he allows (Vikunja #250).
func TestSwapModelsAbsentMeansOff(t *testing.T) {
	c, err := Load(writeConfig(t, `{"phraser": {"model_path": "/m/qwen.gguf"}}`))
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if len(c.Phraser.SwapModels) != 0 {
		t.Errorf("swap_models = %v; want empty when unconfigured", c.Phraser.SwapModels)
	}
}

func TestSwapModelsParsedAndMustBeAbsolute(t *testing.T) {
	c, err := Load(writeConfig(t, `{"phraser": {
		"model_path": "/m/qwen.gguf",
		"swap_models": ["/m/qwen.gguf", "/m/qwen-cpt.gguf"]
	}}`))
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if len(c.Phraser.SwapModels) != 2 {
		t.Fatalf("swap_models = %v; want 2 entries", c.Phraser.SwapModels)
	}
	// A relative entry would resolve against the daemon's cwd, not the operator's.
	if _, err := Load(writeConfig(t, `{"phraser": {
		"model_path": "/m/qwen.gguf",
		"swap_models": ["models/llm/qwen.gguf"]
	}}`)); err == nil {
		t.Error("Load accepted a relative swap_models entry; want a startup failure")
	}
}

// TestUpdateBlockAbsentMeansOff — mavend never updates itself; the block only
// exists so cmd/mavupdate can find the deployment it is asked to update
// (Vikunja #249). Absent is the normal state.
func TestUpdateBlockAbsentMeansOff(t *testing.T) {
	c, err := Load(writeConfig(t, `{}`))
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if c.Update != nil {
		t.Errorf("update = %+v; want nil when unconfigured", c.Update)
	}
}

func TestUpdateBlockValidatedAtStartup(t *testing.T) {
	good := `{"update": {
		"source_dir": "/srv/maven",
		"install_dir": "/srv/maven",
		"snapshot_dir": "/var/lib/maven/snapshots",
		"binaries": ["mavend", "mavweb"],
		"restart_cmd": ["docker", "compose", "up", "-d", "--build", "mavend"],
		"health_socket": "/run/maven/mavend.sock",
		"source_rollback": "git"
	}}`
	c, err := Load(writeConfig(t, good))
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	if c.Update == nil || len(c.Update.Binaries) != 2 {
		t.Fatalf("update block = %+v; want it parsed", c.Update)
	}
	// A block with no health check cannot detect its own failure, so it cannot
	// roll back — refused at load, not halfway through a deploy.
	noHealth := `{"update": {
		"source_dir": "/srv/maven", "install_dir": "/srv/maven",
		"snapshot_dir": "/var/lib/maven/snapshots",
		"binaries": ["mavend"], "restart_cmd": ["true"]
	}}`
	if _, err := Load(writeConfig(t, noHealth)); err == nil {
		t.Error("Load accepted an update block with no health_socket")
	}
}

// A kiwix block with no address, or no book, has nothing to search.
// kiwix-serve answers 400 to an empty books.name, so the block is dropped here
// rather than left to fail one query at a time.
func TestNormaliseDropsIncompleteKiwix(t *testing.T) {
	for _, tc := range []struct {
		name string
		in   *KiwixConfig
	}{
		{"no url", &KiwixConfig{Book: "wikipedia_en_all_maxi"}},
		{"no book", &KiwixConfig{URL: "http://kiwix:8080"}},
		{"blank url", &KiwixConfig{URL: "   ", Book: "b"}},
	} {
		t.Run(tc.name, func(t *testing.T) {
			c := &Config{Kiwix: tc.in}
			c.applyDefaults()
			if c.Kiwix != nil {
				t.Errorf("kept an unusable kiwix block: %+v", c.Kiwix)
			}
		})
	}
}

func TestNormaliseFillsKiwixDefaults(t *testing.T) {
	c := &Config{Kiwix: &KiwixConfig{URL: "http://kiwix:8080", Book: "b"}}
	c.applyDefaults()
	if c.Kiwix == nil {
		t.Fatal("dropped a complete kiwix block")
	}
	if c.Kiwix.MaxResults != DefaultKiwixResults {
		t.Errorf("MaxResults = %d, want %d", c.Kiwix.MaxResults, DefaultKiwixResults)
	}
	if c.Kiwix.SnippetRunes != DefaultKiwixSnippetRunes {
		t.Errorf("SnippetRunes = %d, want %d", c.Kiwix.SnippetRunes, DefaultKiwixSnippetRunes)
	}
	// Rewriting is on unless it is turned off: an English ZIM searched with a
	// Russian sentence matches nothing, so the useful default is the on one.
	if !c.Kiwix.RewriteEnabled() {
		t.Error("rewriting defaulted to off")
	}
	off := false
	c.Kiwix.Rewrite = &off
	if c.Kiwix.RewriteEnabled() {
		t.Error("rewrite: false was not honoured")
	}
}

// A workstation with no address is not a workstation. The unconfigured deploy
// must be indistinguishable from today, so the block is dropped rather than
// left to fail one probe at a time.
func TestNormaliseDropsAddresslessWorkstation(t *testing.T) {
	for _, tc := range []struct {
		name string
		in   *WorkstationConfig
	}{
		{"no url", &WorkstationConfig{Probe: Duration(time.Second)}},
		{"blank url", &WorkstationConfig{URL: "   "}},
	} {
		t.Run(tc.name, func(t *testing.T) {
			c := &Config{Workstation: tc.in}
			c.applyDefaults()
			if c.Workstation != nil {
				t.Errorf("kept an unusable workstation block: %+v", c.Workstation)
			}
		})
	}
}

// The health endpoint defaults to the supervisor's, not llama-server's: mavgpud
// answers 503 while the card is held, and that refusal is the whole signal.
func TestNormaliseFillsWorkstationDefaults(t *testing.T) {
	c := &Config{Workstation: &WorkstationConfig{URL: "http://192.168.1.105:8080/"}}
	c.applyDefaults()
	if c.Workstation == nil {
		t.Fatal("dropped a usable workstation block")
	}
	if got, want := c.Workstation.Health, "http://192.168.1.105:8080/health"; got != want {
		t.Errorf("Health = %q, want %q", got, want)
	}
	if time.Duration(c.Workstation.Probe) != DefaultWorkstationProbe {
		t.Errorf("Probe = %s, want %s", time.Duration(c.Workstation.Probe), DefaultWorkstationProbe)
	}
	if time.Duration(c.Workstation.Timeout) != DefaultWorkstationTimeout {
		t.Errorf("Timeout = %s, want %s", time.Duration(c.Workstation.Timeout), DefaultWorkstationTimeout)
	}
}

// An explicit health URL is left alone: the supervisor may sit behind something
// that does not put /health at the root.
func TestNormaliseKeepsExplicitWorkstationHealth(t *testing.T) {
	c := &Config{Workstation: &WorkstationConfig{
		URL:    "http://192.168.1.105:8080",
		Health: "http://192.168.1.105:9000/ready",
	}}
	c.applyDefaults()
	if got, want := c.Workstation.Health, "http://192.168.1.105:9000/ready"; got != want {
		t.Errorf("Health = %q, want %q", got, want)
	}
}

func TestTelegramIntakeRefusesNamedChat(t *testing.T) {
	// The push half accepts an @channelusername and the intake half cannot use
	// one, so a box with both boots clean and answers nothing. Refuse the
	// config instead.
	p := writeConfig(t, `{"telegram":{"bot_token":"t","chat_id":"@maven","intake":true}}`)
	if _, err := Load(p); err == nil {
		t.Fatal("Load succeeded for intake with an @-name chat id; want error")
	}
}

func TestTelegramNamedChatOKWithoutIntake(t *testing.T) {
	// Push-only is what the @-name is for, so nothing changes for a box that
	// never turned intake on.
	p := writeConfig(t, `{"telegram":{"bot_token":"t","chat_id":"@maven"}}`)
	if _, err := Load(p); err != nil {
		t.Fatalf("Load: %v", err)
	}
}

func TestTelegramIntakeAcceptsNumericChat(t *testing.T) {
	p := writeConfig(t, `{"telegram":{"bot_token":"t","chat_id":"-1001234567890","intake":true}}`)
	if _, err := Load(p); err != nil {
		t.Fatalf("Load: %v", err)
	}
}