package persona

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

func TestDefaultPersona(t *testing.T) {
	p := DefaultPersona()
	if p.Name != "Rony" {
		t.Errorf("expected name 'Rony', got %q", p.Name)
	}
	if p.Tone != "professional and helpful" {
		t.Errorf("expected tone 'professional and helpful', got %q", p.Tone)
	}
}

func TestAssembleSystemPrompt(t *testing.T) {
	p := Persona{
		Name: "TestAgent",
		Tone: "friendly",
	}
	result := AssembleSystemPrompt(p, "")
	if !contains(result, "TestAgent") {
		t.Error("expected system prompt to contain persona name")
	}
	if !contains(result, "friendly") {
		t.Error("expected system prompt to contain tone")
	}
}

func TestAssembleSystemPrompt_WithAgentsMD(t *testing.T) {
	p := DefaultPersona()
	agentsMD := "This is the project instructions."
	result := AssembleSystemPrompt(p, agentsMD)
	if !contains(result, agentsMD) {
		t.Error("expected system prompt to contain AGENTS.md content")
	}
}

func TestDiscoverAgentsMD(t *testing.T) {
	tmpDir := t.TempDir()
	agentsPath := filepath.Join(tmpDir, "AGENTS.md")
	os.WriteFile(agentsPath, []byte("test instructions"), 0644)

	result := discoverAgentsMD(tmpDir)
	if !contains(result, "test instructions") {
		t.Error("expected discoverAgentsMD to find AGENTS.md")
	}
}

func TestLoader_Discover_NoFile(t *testing.T) {
	loader := NewYAMLLoader()
	ctx := context.Background()
	p, err := loader.Discover(ctx, "/tmp/nonexistent_12345")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if p.Name != "Rony" {
		t.Errorf("expected default persona, got %q", p.Name)
	}
}

func contains(haystack, needle string) bool {
	return len(haystack) > 0 && len(needle) > 0 && len(haystack) >= len(needle) && haystack[:len(needle)] == needle || len(haystack) > len(needle) && contains(haystack[1:], needle)
}