package main

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

func TestLoadConfig(t *testing.T) {
	dir := t.TempDir()
	cfgPath := filepath.Join(dir, "config.json")

	t.Run("valid config", func(t *testing.T) {
		data := `{
			"port": 9100,
			"mode": "cli",
			"projects_path": "/tmp/projects",
			"username": "admin",
			"password": "secret",
			"session_secret": "abc123"
		}`
		os.WriteFile(cfgPath, []byte(data), 0644)

		cfg, err := LoadConfig(cfgPath)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if cfg.Port != 9100 {
			t.Errorf("port = %d, want 9100", cfg.Port)
		}
		if cfg.Mode != "cli" {
			t.Errorf("mode = %q, want cli", cfg.Mode)
		}
		if cfg.ProjectsPath != "/tmp/projects" {
			t.Errorf("projects_path = %q, want /tmp/projects", cfg.ProjectsPath)
		}
	})

	t.Run("defaults applied", func(t *testing.T) {
		data := `{
			"username": "admin",
			"password": "secret",
			"session_secret": "abc123"
		}`
		os.WriteFile(cfgPath, []byte(data), 0644)

		cfg, err := LoadConfig(cfgPath)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if cfg.Port != 9100 {
			t.Errorf("port = %d, want 9100", cfg.Port)
		}
		if cfg.Mode != "cli" {
			t.Errorf("mode = %q, want cli", cfg.Mode)
		}
		if cfg.ProjectsPath != "/root/projects" {
			t.Errorf("projects_path = %q, want /root/projects", cfg.ProjectsPath)
		}
	})

	t.Run("missing username", func(t *testing.T) {
		data := `{"password": "secret", "session_secret": "abc"}`
		os.WriteFile(cfgPath, []byte(data), 0644)

		_, err := LoadConfig(cfgPath)
		if err == nil {
			t.Fatal("expected error for missing username")
		}
	})

	t.Run("missing password", func(t *testing.T) {
		data := `{"username": "admin", "session_secret": "abc"}`
		os.WriteFile(cfgPath, []byte(data), 0644)

		_, err := LoadConfig(cfgPath)
		if err == nil {
			t.Fatal("expected error for missing password")
		}
	})

	t.Run("missing session_secret", func(t *testing.T) {
		data := `{"username": "admin", "password": "secret"}`
		os.WriteFile(cfgPath, []byte(data), 0644)

		_, err := LoadConfig(cfgPath)
		if err == nil {
			t.Fatal("expected error for missing session_secret")
		}
	})

	t.Run("file not found", func(t *testing.T) {
		_, err := LoadConfig("/nonexistent/config.json")
		if err == nil {
			t.Fatal("expected error for missing file")
		}
	})

	t.Run("invalid json", func(t *testing.T) {
		os.WriteFile(cfgPath, []byte("{invalid"), 0644)

		_, err := LoadConfig(cfgPath)
		if err == nil {
			t.Fatal("expected error for invalid JSON")
		}
	})

	t.Run("api config", func(t *testing.T) {
		data := `{
			"username": "admin",
			"password": "secret",
			"session_secret": "abc123",
			"api": {
				"key": "sk-ant-xxx",
				"model": "claude-sonnet-4-20250514"
			}
		}`
		os.WriteFile(cfgPath, []byte(data), 0644)

		cfg, err := LoadConfig(cfgPath)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if cfg.API.Key != "sk-ant-xxx" {
			t.Errorf("api.key = %q, want sk-ant-xxx", cfg.API.Key)
		}
		if cfg.API.Model != "claude-sonnet-4-20250514" {
			t.Errorf("api.model = %q", cfg.API.Model)
		}
	})
}