package config

import (
	"os"
	"testing"
	"time"
)

func TestDefaultConfig(t *testing.T) {
	cfg := DefaultConfig()
	if cfg == nil {
		t.Fatal("DefaultConfig() returned nil")
	}

	// Check Ollama defaults
	if cfg.Ollama.BaseURL != "http://localhost:11434" {
		t.Errorf("expected default Ollama BaseURL 'http://localhost:11434', got %q", cfg.Ollama.BaseURL)
	}
	if cfg.Ollama.Model != "gemma4:e4b" {
		t.Errorf("expected default Ollama Model 'gemma4:e4b', got %q", cfg.Ollama.Model)
	}
	if cfg.Ollama.Timeout != 120*time.Second {
		t.Errorf("expected default Ollama Timeout 120s, got %v", cfg.Ollama.Timeout)
	}

	// Check Sandbox defaults
	if cfg.Sandbox.Timeout != 30*time.Second {
		t.Errorf("expected default Sandbox Timeout 30s, got %v", cfg.Sandbox.Timeout)
	}
	if cfg.Sandbox.MaxMemory != 512*1024*1024 {
		t.Errorf("expected default Sandbox MaxMemory 512MB, got %d", cfg.Sandbox.MaxMemory)
	}
	if cfg.Sandbox.WorkingDir != "/tmp/orca/sandbox" {
		t.Errorf("expected default Sandbox WorkingDir '/tmp/orca/sandbox', got %q", cfg.Sandbox.WorkingDir)
	}

	// Check Session defaults
	if cfg.Session.MaxHistory != 100 {
		t.Errorf("expected default Session MaxHistory 100, got %d", cfg.Session.MaxHistory)
	}
	if cfg.Session.StorageDir == "" {
		t.Error("expected non-empty Session StorageDir")
	}
}

func TestDefaultConfigStorageDir(t *testing.T) {
	cfg := DefaultConfig()
	home, _ := os.UserHomeDir()
	expected := home + "/.orca/sessions"
	if cfg.Session.StorageDir != expected {
		t.Errorf("expected StorageDir %q, got %q", expected, cfg.Session.StorageDir)
	}
}

func TestLoadConfigFromEnv(t *testing.T) {
	// Set environment variables
	os.Setenv("ORCA_OLLAMA_BASE_URL", "http://custom:11434")
	os.Setenv("ORCA_OLLAMA_MODEL", "codellama")
	os.Setenv("ORCA_OLLAMA_TIMEOUT", "60s")
	os.Setenv("ORCA_SANDBOX_TIMEOUT", "120s")
	os.Setenv("ORCA_SANDBOX_MAX_MEMORY", "1073741824")
	os.Setenv("ORCA_SANDBOX_WORKING_DIR", "/custom/sandbox")
	os.Setenv("ORCA_SESSION_STORAGE_DIR", "/custom/sessions")
	os.Setenv("ORCA_SESSION_MAX_HISTORY", "200")

	defer func() {
		os.Unsetenv("ORCA_OLLAMA_BASE_URL")
		os.Unsetenv("ORCA_OLLAMA_MODEL")
		os.Unsetenv("ORCA_OLLAMA_TIMEOUT")
		os.Unsetenv("ORCA_SANDBOX_TIMEOUT")
		os.Unsetenv("ORCA_SANDBOX_MAX_MEMORY")
		os.Unsetenv("ORCA_SANDBOX_WORKING_DIR")
		os.Unsetenv("ORCA_SESSION_STORAGE_DIR")
		os.Unsetenv("ORCA_SESSION_MAX_HISTORY")
	}()

	cfg := LoadConfigFromEnv()

	if cfg.Ollama.BaseURL != "http://custom:11434" {
		t.Errorf("expected Ollama BaseURL 'http://custom:11434', got %q", cfg.Ollama.BaseURL)
	}
	if cfg.Ollama.Model != "codellama" {
		t.Errorf("expected Ollama Model 'codellama', got %q", cfg.Ollama.Model)
	}
	if cfg.Ollama.Timeout != 60*time.Second {
		t.Errorf("expected Ollama Timeout 60s, got %v", cfg.Ollama.Timeout)
	}
	if cfg.Sandbox.Timeout != 120*time.Second {
		t.Errorf("expected Sandbox Timeout 120s, got %v", cfg.Sandbox.Timeout)
	}
	if cfg.Sandbox.MaxMemory != 1073741824 {
		t.Errorf("expected Sandbox MaxMemory 1073741824, got %d", cfg.Sandbox.MaxMemory)
	}
	if cfg.Sandbox.WorkingDir != "/custom/sandbox" {
		t.Errorf("expected Sandbox WorkingDir '/custom/sandbox', got %q", cfg.Sandbox.WorkingDir)
	}
	if cfg.Session.StorageDir != "/custom/sessions" {
		t.Errorf("expected Session StorageDir '/custom/sessions', got %q", cfg.Session.StorageDir)
	}
	if cfg.Session.MaxHistory != 200 {
		t.Errorf("expected Session MaxHistory 200, got %d", cfg.Session.MaxHistory)
	}
}

func TestLoadConfigFromEnvPartial(t *testing.T) {
	os.Setenv("ORCA_OLLAMA_MODEL", "mistral")
	defer os.Unsetenv("ORCA_OLLAMA_MODEL")

	cfg := LoadConfigFromEnv()

	// Should use env override
	if cfg.Ollama.Model != "mistral" {
		t.Errorf("expected Model 'mistral', got %q", cfg.Ollama.Model)
	}
	// Should keep defaults for unset values
	if cfg.Ollama.BaseURL != "http://localhost:11434" {
		t.Errorf("expected default BaseURL, got %q", cfg.Ollama.BaseURL)
	}
}

func TestConfigIsValid(t *testing.T) {
	cfg := DefaultConfig()
	if err := cfg.IsValid(); err != nil {
		t.Errorf("default config should be valid: %v", err)
	}
}

func TestConfigInvalidBaseURL(t *testing.T) {
	cfg := DefaultConfig()
	cfg.Provider = ProviderOllama
	cfg.Ollama.BaseURL = ""
	if err := cfg.IsValid(); err == nil {
		t.Error("expected error for empty BaseURL")
	}
}

func TestConfigInvalidModel(t *testing.T) {
	cfg := DefaultConfig()
	cfg.Provider = ProviderOllama
	cfg.Ollama.Model = ""
	if err := cfg.IsValid(); err == nil {
		t.Error("expected error for empty Model")
	}
}

func TestConfigInvalidOllamaTimeout(t *testing.T) {
	cfg := DefaultConfig()
	cfg.Provider = ProviderOllama
	cfg.Ollama.Timeout = 0
	if err := cfg.IsValid(); err == nil {
		t.Error("expected error for zero Ollama Timeout")
	}
}

func TestConfigInvalidDeepSeekAPIKey(t *testing.T) {
	cfg := DefaultConfig()
	cfg.Provider = ProviderDeepSeek
	cfg.DeepSeek.APIKey = ""
	if err := cfg.IsValid(); err == nil {
		t.Error("expected error for empty DeepSeek APIKey")
	}
}

func TestConfigInvalidSandboxTimeout(t *testing.T) {
	cfg := DefaultConfig()
	cfg.Sandbox.Timeout = -1
	if err := cfg.IsValid(); err == nil {
		t.Error("expected error for negative Sandbox Timeout")
	}
}

func TestConfigInvalidMaxMemory(t *testing.T) {
	cfg := DefaultConfig()
	cfg.Sandbox.MaxMemory = 0
	if err := cfg.IsValid(); err == nil {
		t.Error("expected error for zero MaxMemory")
	}
}

func TestConfigInvalidMaxHistory(t *testing.T) {
	cfg := DefaultConfig()
	cfg.Session.MaxHistory = 0
	if err := cfg.IsValid(); err == nil {
		t.Error("expected error for zero MaxHistory")
	}
}

func TestConfigError(t *testing.T) {
	err := errConfig("test error")
	if err.Error() != "config: test error" {
		t.Errorf("unexpected error message: %s", err.Error())
	}

	ce, ok := err.(*ConfigError)
	if !ok {
		t.Fatal("expected ConfigError type")
	}
	if ce.Message != "test error" {
		t.Errorf("expected Message 'test error', got %q", ce.Message)
	}
}

func TestLoadConfigFromEnvInvalidTimeout(t *testing.T) {
	os.Setenv("ORCA_OLLAMA_TIMEOUT", "not-a-duration")
	defer os.Unsetenv("ORCA_OLLAMA_TIMEOUT")

	cfg := LoadConfigFromEnv()
	// Should keep default when env var is unparseable
	if cfg.Ollama.Timeout != 120*time.Second {
		t.Errorf("expected default 120s when env is invalid, got %v", cfg.Ollama.Timeout)
	}
}

func TestLoadConfigFromEnvInvalidMaxMemory(t *testing.T) {
	os.Setenv("ORCA_SANDBOX_MAX_MEMORY", "not-a-number")
	defer os.Unsetenv("ORCA_SANDBOX_MAX_MEMORY")

	cfg := LoadConfigFromEnv()
	// Should keep default when env var is unparseable
	if cfg.Sandbox.MaxMemory != 512*1024*1024 {
		t.Errorf("expected default MaxMemory when env is invalid, got %d", cfg.Sandbox.MaxMemory)
	}
}

func TestLoadConfigFromEnvInvalidMaxHistory(t *testing.T) {
	os.Setenv("ORCA_SESSION_MAX_HISTORY", "not-a-number")
	defer os.Unsetenv("ORCA_SESSION_MAX_HISTORY")

	cfg := LoadConfigFromEnv()
	if cfg.Session.MaxHistory != 100 {
		t.Errorf("expected default MaxHistory when env is invalid, got %d", cfg.Session.MaxHistory)
	}
}