package cmd

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

func TestGetChatHistoryFile(t *testing.T) {
	// Save original HOME
	oldHome := os.Getenv("HOME")
	defer os.Setenv("HOME", oldHome)

	tmpDir := t.TempDir()
	os.Setenv("HOME", tmpDir)

	histFile := getChatHistoryFile()
	expected := filepath.Join(tmpDir, ".config", "grokkit", "chat_history.json")

	if histFile != expected {
		t.Errorf("getChatHistoryFile() = %q, want %q", histFile, expected)
	}
}

func TestLoadChatHistory_NoFile(t *testing.T) {
	tmpDir := t.TempDir()
	oldHome := os.Getenv("HOME")
	os.Setenv("HOME", tmpDir)
	defer os.Setenv("HOME", oldHome)

	history := loadChatHistory()
	if history != nil {
		t.Errorf("loadChatHistory() expected nil for non-existent file, got %v", history)
	}
}

func TestSaveAndLoadChatHistory(t *testing.T) {
	tmpDir := t.TempDir()
	oldHome := os.Getenv("HOME")
	os.Setenv("HOME", tmpDir)
	defer os.Setenv("HOME", oldHome)

	// Create test messages
	messages := []map[string]string{
		{"role": "system", "content": "test system message"},
		{"role": "user", "content": "hello"},
		{"role": "assistant", "content": "hi there"},
	}

	// Save
	err := saveChatHistory(messages)
	if err != nil {
		t.Fatalf("saveChatHistory() error: %v", err)
	}

	// Load
	loaded := loadChatHistory()
	if loaded == nil {
		t.Fatal("loadChatHistory() returned nil")
	}

	if len(loaded) != len(messages) {
		t.Errorf("loadChatHistory() length = %d, want %d", len(loaded), len(messages))
	}

	// Verify content
	for i, msg := range loaded {
		if msg["role"] != messages[i]["role"] {
			t.Errorf("Message[%d] role = %q, want %q", i, msg["role"], messages[i]["role"])
		}
		if msg["content"] != messages[i]["content"] {
			t.Errorf("Message[%d] content = %q, want %q", i, msg["content"], messages[i]["content"])
		}
	}
}

func TestLoadChatHistory_InvalidJSON(t *testing.T) {
	tmpDir := t.TempDir()
	oldHome := os.Getenv("HOME")
	os.Setenv("HOME", tmpDir)
	defer os.Setenv("HOME", oldHome)

	// Create invalid JSON file
	histDir := filepath.Join(tmpDir, ".config", "grokkit")
	os.MkdirAll(histDir, 0755)
	histFile := filepath.Join(histDir, "chat_history.json")
	os.WriteFile(histFile, []byte("invalid json{{{"), 0644)

	history := loadChatHistory()
	if history != nil {
		t.Errorf("loadChatHistory() expected nil for invalid JSON, got %v", history)
	}
}