package config

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

func TestDefault_EmptyHome_ReturnsError(t *testing.T) {
	t.Setenv("HOME", "")
	_, err := Default()
	if err == nil {
		t.Fatal("expected error when HOME is empty, got nil")
	}
}

func TestDefault_ValidHome_ReturnsConfig(t *testing.T) {
	t.Setenv("HOME", "/tmp/testhome")
	cfg, err := Default()
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if cfg.DataDir != "/tmp/testhome/.claudomator" {
		t.Errorf("DataDir = %q, want /tmp/testhome/.claudomator", cfg.DataDir)
	}
}

func TestLoadFile_OverridesDefaults(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.toml")
	if err := os.WriteFile(path, []byte("server_addr = \":9191\"\n"), 0600); err != nil {
		t.Fatal(err)
	}
	t.Setenv("HOME", dir)

	cfg, err := LoadFile(path)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if cfg.ServerAddr != ":9191" {
		t.Errorf("ServerAddr = %q, want :9191", cfg.ServerAddr)
	}
	// Unset fields retain defaults.
	if cfg.MaxConcurrent != 3 {
		t.Errorf("MaxConcurrent = %d, want 3", cfg.MaxConcurrent)
	}
}

func TestLoadFile_MissingFile_ReturnsError(t *testing.T) {
	t.Setenv("HOME", t.TempDir())
	_, err := LoadFile("/nonexistent/config.toml")
	if err == nil {
		t.Fatal("expected error for missing file, got nil")
	}
}

func TestRunnersConfig_DefaultsAllEnabled(t *testing.T) {
	r := RunnersConfig{}
	if !r.ClaudeEnabled() {
		t.Error("claude should be enabled by default (nil)")
	}
	if !r.GeminiEnabled() {
		t.Error("gemini should be enabled by default (nil)")
	}
	if !r.LocalEnabled() {
		t.Error("local should be enabled by default (nil)")
	}
	if !r.ContainerEnabled() {
		t.Error("container should be enabled by default (nil)")
	}
}

func TestRunnersConfig_ExplicitFalseDisables(t *testing.T) {
	f := false
	r := RunnersConfig{Claude: &f, Gemini: &f, Local: &f, Container: &f}
	if r.ClaudeEnabled() {
		t.Error("explicit false should disable claude")
	}
	if r.GeminiEnabled() {
		t.Error("explicit false should disable gemini")
	}
	if r.LocalEnabled() {
		t.Error("explicit false should disable local")
	}
	if r.ContainerEnabled() {
		t.Error("explicit false should disable container")
	}
}

func TestRunnersConfig_ExplicitTrueEnables(t *testing.T) {
	tr := true
	r := RunnersConfig{Claude: &tr, Gemini: &tr, Local: &tr, Container: &tr}
	if !r.ClaudeEnabled() || !r.GeminiEnabled() || !r.LocalEnabled() || !r.ContainerEnabled() {
		t.Error("explicit true should keep all runners enabled")
	}
}

func TestRunnersConfig_MixedToggles(t *testing.T) {
	f, tr := false, true
	r := RunnersConfig{Claude: &tr, Gemini: &f, Local: &tr}
	if !r.ClaudeEnabled() {
		t.Error("claude should be enabled")
	}
	if r.GeminiEnabled() {
		t.Error("gemini should be disabled")
	}
	if !r.LocalEnabled() {
		t.Error("local should be enabled")
	}
	if !r.ContainerEnabled() {
		t.Error("container should be enabled (nil = default)")
	}
}

func TestRunnersConfig_TOMLRoundTrip(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.toml")
	toml := "[runners]\ngemini = false\n"
	if err := os.WriteFile(path, []byte(toml), 0600); err != nil {
		t.Fatal(err)
	}
	t.Setenv("HOME", dir)

	cfg, err := LoadFile(path)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if cfg.Runners.GeminiEnabled() {
		t.Error("gemini should be disabled after TOML load")
	}
	if !cfg.Runners.ClaudeEnabled() {
		t.Error("claude should remain enabled (not in TOML)")
	}
	if !cfg.Runners.LocalEnabled() {
		t.Error("local should remain enabled (not in TOML)")
	}
}

func TestLocalModel_UseForElaborate_EmptyEndpoint(t *testing.T) {
	m := LocalModel{}
	if m.UseForElaborate() {
		t.Error("empty endpoint should never opt into elaborate")
	}
}

func TestLocalModel_UseForElaborate_DefaultTrue(t *testing.T) {
	m := LocalModel{Endpoint: "http://localhost:11434/v1"}
	if !m.UseForElaborate() {
		t.Error("endpoint set + default flag should opt in")
	}
}

func TestLocalModel_UseForElaborate_ExplicitFalse(t *testing.T) {
	f := false
	m := LocalModel{Endpoint: "http://localhost:11434/v1", PreferForElaborate: &f}
	if m.UseForElaborate() {
		t.Error("explicit false should opt out")
	}
}

func TestLocalModel_UseForElaborate_ExplicitTrue(t *testing.T) {
	tr := true
	m := LocalModel{Endpoint: "http://localhost:11434/v1", PreferForElaborate: &tr}
	if !m.UseForElaborate() {
		t.Error("explicit true should opt in")
	}
}

func TestProvidersConfig_TOMLRoundTrip(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.toml")
	toml := `
[providers.groq]
endpoint = "https://api.groq.com/openai/v1"
api_key = "gsk_abc"
default_model = "llama-3.3-70b-versatile"
timeout_seconds = 30

[providers.anthropic]
api_key = "sk-ant-xyz"
default_model = "claude-sonnet-4-5"
`
	if err := os.WriteFile(path, []byte(toml), 0600); err != nil {
		t.Fatal(err)
	}
	t.Setenv("HOME", dir)

	cfg, err := LoadFile(path)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if len(cfg.Providers) != 2 {
		t.Fatalf("expected 2 providers, got %d: %+v", len(cfg.Providers), cfg.Providers)
	}
	groq, ok := cfg.Providers["groq"]
	if !ok {
		t.Fatal("expected [providers.groq] table")
	}
	if groq.Endpoint != "https://api.groq.com/openai/v1" || groq.APIKey != "gsk_abc" ||
		groq.DefaultModel != "llama-3.3-70b-versatile" || groq.TimeoutSeconds != 30 {
		t.Errorf("groq provider config: %+v", groq)
	}
	anthropic, ok := cfg.Providers["anthropic"]
	if !ok {
		t.Fatal("expected [providers.anthropic] table")
	}
	if anthropic.Endpoint != "" || anthropic.APIKey != "sk-ant-xyz" || anthropic.DefaultModel != "claude-sonnet-4-5" {
		t.Errorf("anthropic provider config: %+v", anthropic)
	}
}