package llm

import (
	"testing"
	"time"

	"code.chimeric.al/chimerical/odidere/internal/config"
)

func TestTool_ParseArguments(t *testing.T) {
	tool := &Tool{
		Arguments: []string{"--name {{.name}}", "{{if .flag}}--enabled{{end}}"},
	}
	tests := []struct {
		name     string
		args     string
		expected []string
	}{
		{
			name:     "basic",
			args:     `{"name": "test"}`,
			expected: []string{"--name test"},
		},
		{
			name:     "with flag",
			args:     `{"name": "test", "flag": true}`,
			expected: []string{"--name test", "--enabled"},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := tool.ParseArguments(tt.args)
			if err != nil {
				t.Fatalf("ParseArguments failed: %v", err)
			}
			if len(got) != len(tt.expected) {
				t.Errorf("expected len %d, got %d", len(tt.expected), len(got))
			}
			for i := range got {
				if got[i] != tt.expected[i] {
					t.Errorf("expected %q, got %q", tt.expected[i], got[i])
				}
			}
		})
	}
}

func TestNewTool(t *testing.T) {
	tests := []struct {
		name    string
		cfg     config.ToolConfig
		wantErr bool
	}{
		{
			name: "valid",
			cfg: config.ToolConfig{
				Name:        "test",
				Description: "desc",
				Command:     "ls",
				Timeout:     "10s",
			},
			wantErr: false,
		},
		{
			name: "invalid timeout",
			cfg: config.ToolConfig{
				Name:        "test",
				Description: "desc",
				Command:     "ls",
				Timeout:     "invalid",
			},
			wantErr: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			tool, err := NewTool(tt.cfg)
			if (err != nil) != tt.wantErr {
				t.Errorf("NewTool() error = %v, wantErr %v", err, tt.wantErr)
			}
			if err == nil {
				if tool.Name != tt.cfg.Name {
					t.Errorf("expected name %s, got %s", tt.cfg.Name, tool.Name)
				}
				if tt.cfg.Timeout == "10s" && tool.timeout != 10*time.Second {
					t.Errorf("expected timeout 10s, got %v", tool.timeout)
				}
			}
		})
	}
}

func TestRegistry_NewRegistry(t *testing.T) {
	tests := []struct {
		name    string
		tools   []config.ToolConfig
		wantErr bool
	}{
		{
			name: "valid",
			tools: []config.ToolConfig{
				{Name: "t1", Description: "d1", Command: "c1"},
				{Name: "t2", Description: "d2", Command: "c2"},
			},
			wantErr: false,
		},
		{
			name: "duplicate",
			tools: []config.ToolConfig{
				{Name: "t1", Description: "d1", Command: "c1"},
				{Name: "t1", Description: "d2", Command: "c2"},
			},
			wantErr: true,
		},
		{
			name: "invalid tool",
			tools: []config.ToolConfig{
				{Name: "t1", Description: "d1", Command: "c1", Timeout: "invalid"},
			},
			wantErr: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			_, err := NewRegistry(tt.tools)
			if (err != nil) != tt.wantErr {
				t.Errorf("NewRegistry() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
	}
}

func TestRegistry_ToAPI_Nil(t *testing.T) {
	var reg *Registry
	got := reg.ToAPI()
	if got != nil {
		t.Errorf("Registry.ToAPI(nil) = %v, want nil", got)
	}
}

func TestRegistry_ToAPI_Empty(t *testing.T) {
	reg, err := NewRegistry(nil)
	if err != nil {
		t.Fatalf("NewRegistry(nil) error = %v", err)
	}
	got := reg.ToAPI()
	if len(got) != 0 {
		t.Errorf("Registry.ToAPI(empty) len = %d, want 0", len(got))
	}
}

func TestRegistry_ToAPI_Single(t *testing.T) {
	reg, err := NewRegistry([]config.ToolConfig{
		{
			Name:        "weather",
			Description: "Get the weather",
			Parameters:  map[string]any{"type": "object"},
		},
	})
	if err != nil {
		t.Fatalf("NewRegistry error = %v", err)
	}
	got := reg.ToAPI()
	if len(got) != 1 {
		t.Fatalf("len = %d, want 1", len(got))
	}
	if got[0].Type != "function" {
		t.Errorf("type = %q, want %q", got[0].Type, "function")
	}
	if got[0].Function.Name != "weather" {
		t.Errorf("name = %q, want %q", got[0].Function.Name, "weather")
	}
	if got[0].Function.Description != "Get the weather" {
		t.Errorf("description = %q, want %q", got[0].Function.Description, "Get the weather")
	}
}

func TestTool_ToAPI(t *testing.T) {
	tool := &Tool{
		Name:        "test",
		Description: "A test tool",
		Parameters:  map[string]any{"type": "object"},
		Command:     "echo",
		Arguments:   []string{"hello"},
	}

	api := tool.ToAPI()
	if api.Type != "function" {
		t.Errorf("type = %q, want %q", api.Type, "function")
	}
	if api.Function.Name != "test" {
		t.Errorf("name = %q, want %q", api.Function.Name, "test")
	}
	if api.Function.Description != "A test tool" {
		t.Errorf("description = %q, want %q", api.Function.Description, "A test tool")
	}
	if api.Function.Parameters == nil {
		t.Error("parameters is nil")
	}
}