package openweather

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"pilotvault/apiserver/internal/plugins"
)

func TestDescriptor(t *testing.T) {
	p := &Plugin{}
	d := p.Descriptor()
	if d.Name != "openweather" {
		t.Fatalf("name = %q, want openweather", d.Name)
	}
	if d.Kind != plugins.KindBuiltin {
		t.Fatalf("kind = %q, want builtin", d.Kind)
	}
	if d.Category != plugins.CategoryAPIsExternal {
		t.Fatalf("category = %q, want %q", d.Category, plugins.CategoryAPIsExternal)
	}
	if d.AuthType != plugins.AuthAPIKey {
		t.Fatalf("authType = %q, want %q", d.AuthType, plugins.AuthAPIKey)
	}
	if len(d.Capabilities) == 0 {
		t.Fatal("expected capabilities")
	}
	// The apiKey field must be flagged so the manager masks it, and no field may
	// be Required (so the plugin can be enabled as an empty master switch).
	for _, f := range d.ConfigFields {
		if f.Key == "apiKey" && !f.Secret {
			t.Errorf("config field %q must be Secret", f.Key)
		}
		if f.Required {
			t.Errorf("config field %q must not be Required", f.Key)
		}
		// Units must be blank-able so the value can fall through the settings
		// cascade: a blank "" option and no Default, otherwise the global layer
		// always sets it and locks organizations/users out.
		if f.Key == "units" {
			if f.Default != "" {
				t.Errorf("units field must not carry a Default (got %q) — it would lock lower cascade layers", f.Default)
			}
			hasBlank := false
			for _, o := range f.Options {
				if o.Value == "" {
					hasBlank = true
				}
			}
			if !hasBlank {
				t.Error("units field must offer a blank \"\" (Not set) option so it can fall through the cascade")
			}
		}
	}
}

func TestInitDefaults(t *testing.T) {
	p := &Plugin{}
	if err := p.Init(context.Background(), nil); err != nil {
		t.Fatal(err)
	}
	if p.units != "metric" {
		t.Errorf("default units = %q, want metric", p.units)
	}
	if p.lat != defaultLat || p.lon != defaultLon {
		t.Errorf("default location = %q,%q, want %q,%q", p.lat, p.lon, defaultLat, defaultLon)
	}
	if p.client == nil {
		t.Error("Init must build an http client")
	}
}

func TestRequestURL(t *testing.T) {
	p := &Plugin{}
	_ = p.Init(context.Background(), map[string]string{
		"apiKey": "secret", "units": "imperial", "lang": "pl",
	})
	got := p.requestURL("/data/2.5/weather", p.pointQuery("10", "20"))
	for _, want := range []string{"lat=10", "lon=20", "units=imperial", "lang=pl", "appid=secret", "/data/2.5/weather?"} {
		if !strings.Contains(got, want) {
			t.Errorf("requestURL %q missing %q", got, want)
		}
	}
}

// TestRequestURLNoKey confirms the appid param is omitted when no key is set, so
// a key is never leaked as an empty value.
func TestRequestURLNoKey(t *testing.T) {
	p := &Plugin{}
	_ = p.Init(context.Background(), nil)
	if got := p.requestURL("/data/2.5/weather", p.pointQuery("", "")); strings.Contains(got, "appid") {
		t.Errorf("requestURL %q must not contain appid when key is unset", got)
	}
}

// TestHealthCheckNoKey confirms a missing key is reported as down, not a panic.
func TestHealthCheckNoKey(t *testing.T) {
	p := &Plugin{}
	_ = p.Init(context.Background(), nil)
	if h := p.HealthCheck(context.Background()); h.Status != plugins.StatusDown {
		t.Errorf("status = %q, want down (detail=%q)", h.Status, h.Detail)
	}
}

func TestRegistered(t *testing.T) {
	m := plugins.NewManager(t.TempDir() + "/plugins.json")
	if _, ok := m.Get("openweather"); !ok {
		t.Fatal("openweather not registered in the plugin manager")
	}
}

// fakeOW is a minimal OpenWeather stand-in: it validates the appid and echoes a
// small current-weather body, and returns 401 for a wrong key.
func newFakeOW(t *testing.T) *httptest.Server {
	t.Helper()
	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Query().Get("appid") != "good-key" {
			w.WriteHeader(http.StatusUnauthorized)
			return
		}
		switch r.URL.Path {
		case "/data/2.5/weather":
			w.Header().Set("Content-Type", "application/json")
			_, _ = w.Write([]byte(`{"name":"Warsaw","main":{"temp":12.5},"weather":[{"description":"clear sky"}]}`))
		case "/data/2.5/forecast":
			w.Header().Set("Content-Type", "application/json")
			_, _ = w.Write([]byte(`{"cnt":40,"list":[]}`))
		default:
			w.WriteHeader(http.StatusNotFound)
		}
	}))
}

func TestHealthCheckOK(t *testing.T) {
	srv := newFakeOW(t)
	defer srv.Close()

	p := &Plugin{}
	_ = p.Init(context.Background(), map[string]string{"apiKey": "good-key"})
	p.base = srv.URL

	h := p.HealthCheck(context.Background())
	if h.Status != plugins.StatusOK {
		t.Fatalf("status = %q, want ok (detail=%q)", h.Status, h.Detail)
	}
	if !strings.Contains(h.Detail, "Warsaw") || !strings.Contains(h.Detail, "clear sky") {
		t.Errorf("detail = %q, want it to summarise the current conditions", h.Detail)
	}
}

func TestHealthCheckAuthFailure(t *testing.T) {
	srv := newFakeOW(t)
	defer srv.Close()

	p := &Plugin{}
	_ = p.Init(context.Background(), map[string]string{"apiKey": "wrong"})
	p.base = srv.URL

	if h := p.HealthCheck(context.Background()); h.Status != plugins.StatusDegraded {
		t.Errorf("status = %q, want degraded on 401 (detail=%q)", h.Status, h.Detail)
	}
}

func TestInvoke(t *testing.T) {
	srv := newFakeOW(t)
	defer srv.Close()

	p := &Plugin{}
	_ = p.Init(context.Background(), map[string]string{"apiKey": "good-key"})
	p.base = srv.URL
	ctx := context.Background()

	// current weather with an explicit location override
	raw, err := p.Invoke(ctx, "weather.current", json.RawMessage(`{"lat":"51.5","lon":"-0.12"}`))
	if err != nil {
		t.Fatalf("weather.current: %v", err)
	}
	var cur struct {
		Name string `json:"name"`
	}
	if err := json.Unmarshal(raw, &cur); err != nil || cur.Name != "Warsaw" {
		t.Fatalf("weather.current body = %s (err=%v)", raw, err)
	}

	// 5-day forecast using the default location
	if _, err := p.Invoke(ctx, "forecast.5day", nil); err != nil {
		t.Fatalf("forecast.5day: %v", err)
	}

	// unknown action
	if _, err := p.Invoke(ctx, "nope", nil); err == nil {
		t.Error("expected error for unknown action")
	}
}

// TestInvokeNoKey confirms Invoke refuses to call upstream without a key.
func TestInvokeNoKey(t *testing.T) {
	p := &Plugin{}
	_ = p.Init(context.Background(), nil)
	if _, err := p.Invoke(context.Background(), "weather.current", nil); err == nil {
		t.Error("expected errNoKey when no API key is configured")
	}
}