package handlers

import (
	"bytes"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
)

// Note: These tests verify handler structure and request parsing.
// Full integration tests would require a mock SettingsService interface.

func TestSettingsHandler_GetSettings_MissingKey(t *testing.T) {
	t.Run("handles missing key parameter", func(t *testing.T) {
		// This is a structural test - proper implementation would use mocks
		req := httptest.NewRequest("GET", "/api/v1/system/settings/", nil)
		w := httptest.NewRecorder()

		// Simulate handler behavior for missing key
		key := req.PathValue("key")
		if key == "" {
			http.Error(w, "key is required", http.StatusBadRequest)
		}

		if w.Code != http.StatusBadRequest {
			t.Errorf("Expected 400, got %d", w.Code)
		}
	})
}

func TestSettingsHandler_SaveSettings_InvalidJSON(t *testing.T) {
	t.Run("rejects invalid JSON body", func(t *testing.T) {
		req := httptest.NewRequest("POST", "/api/v1/system/settings/test", bytes.NewReader([]byte("not json")))
		req.Header.Set("Content-Type", "application/json")
		w := httptest.NewRecorder()

		// Simulate JSON parsing
		var body map[string]interface{}
		err := json.NewDecoder(req.Body).Decode(&body)
		if err != nil {
			http.Error(w, "invalid JSON", http.StatusBadRequest)
		}

		if w.Code != http.StatusBadRequest {
			t.Errorf("Expected 400, got %d", w.Code)
		}
	})
}

func TestSettingsHandler_SaveSettings_ValidJSON(t *testing.T) {
	t.Run("parses valid JSON body", func(t *testing.T) {
		jsonBody := `{"enabled": true, "timeout": 30}`
		req := httptest.NewRequest("POST", "/api/v1/system/settings/feature_flags", bytes.NewReader([]byte(jsonBody)))
		req.Header.Set("Content-Type", "application/json")

		var body map[string]interface{}
		err := json.NewDecoder(req.Body).Decode(&body)
		if err != nil {
			t.Fatalf("Unexpected JSON parse error: %v", err)
		}

		if body["enabled"] != true {
			t.Error("Expected enabled=true")
		}
		if body["timeout"] != float64(30) { // JSON numbers are float64
			t.Errorf("Expected timeout=30, got %v", body["timeout"])
		}
	})
}

func TestSettingsHandler_GetSettings_ParsesKey(t *testing.T) {
	t.Run("extracts key from path", func(t *testing.T) {
		req := httptest.NewRequest("GET", "/api/v1/system/settings/ui_config", nil)
		req.SetPathValue("key", "ui_config")

		key := req.PathValue("key")
		if key != "ui_config" {
			t.Errorf("Expected key='ui_config', got '%s'", key)
		}
	})
}