package api

import (
	"context"
	"encoding/json"
	"testing"

	"pilotvault/apiserver/internal/plugins"
)

// newOWServer builds a minimal Server whose plugin manager has openweather
// enabled with the given global config. admin is left nil (not configured), so
// the org layer is skipped and the cascade covers global + user only.
func newOWServer(t *testing.T, global map[string]string) *Server {
	t.Helper()
	mgr := plugins.NewManager(t.TempDir() + "/plugins.json")
	if _, err := mgr.Upsert(context.Background(), openWeatherPlugin, true, global); err != nil {
		t.Fatalf("enable openweather: %v", err)
	}
	return &Server{plugins: mgr}
}

// userRaw builds a pluginSettings blob with an openweather user layer.
func userRaw(t *testing.T, cfg owConfig, enabled bool) json.RawMessage {
	t.Helper()
	b, err := json.Marshal(owSettingsDoc{OpenWeather: owStored{Config: cfg, Enabled: enabled}})
	if err != nil {
		t.Fatal(err)
	}
	return b
}

func TestResolveOpenWeatherCascade(t *testing.T) {
	// Global supplies the API key + units and leaves the location blank so the
	// user layer fills it in. (A value set globally locks the lower layers — that
	// is verified separately by the masked/locked apiKey below.)
	s := newOWServer(t, map[string]string{"apiKey": "GLOBAL-KEY", "units": "metric"})
	who := &callerIdentity{ID: "u1", Role: roleUser} // org-less
	uRaw := userRaw(t, owConfig{Lat: "51.5", Lon: "-0.12"}, true)

	res := s.resolveOpenWeather(context.Background(), who, uRaw)

	if !res.available {
		t.Error("available should be true when the plugin is enabled")
	}
	if !res.enabled {
		t.Error("enabled should reflect the user's personal opt-in")
	}
	// API key + units come from global (user left them blank).
	if res.eff.APIKey != "GLOBAL-KEY" || res.source["apiKey"] != "global" {
		t.Errorf("apiKey = %q src %q, want GLOBAL-KEY/global", res.eff.APIKey, res.source["apiKey"])
	}
	if res.eff.Units != "metric" || res.source["units"] != "global" {
		t.Errorf("units = %q src %q, want metric/global", res.eff.Units, res.source["units"])
	}
	// Location comes from the user layer (top-wins over the global default).
	if res.eff.Lat != "51.5" || res.source["lat"] != "user" {
		t.Errorf("lat = %q src %q, want 51.5/user", res.eff.Lat, res.source["lat"])
	}
	if res.eff.Lon != "-0.12" || res.source["lon"] != "user" {
		t.Errorf("lon = %q src %q, want -0.12/user", res.eff.Lon, res.source["lon"])
	}
}

// A field set globally locks the lower layers: even when the user supplies units,
// the global value stays in force and is sourced to "global".
func TestResolveOpenWeatherGlobalLocksUser(t *testing.T) {
	s := newOWServer(t, map[string]string{"apiKey": "K", "units": "metric"})
	who := &callerIdentity{ID: "u1", Role: roleUser}
	uRaw := userRaw(t, owConfig{Units: "imperial"}, false)

	res := s.resolveOpenWeather(context.Background(), who, uRaw)
	if res.eff.Units != "metric" || res.source["units"] != "global" {
		t.Errorf("units = %q src %q, want metric/global (global must lock the user's imperial)", res.eff.Units, res.source["units"])
	}
}

// The view must never leak the concrete API key — only presence, masked.
func TestOpenWeatherViewMasksKey(t *testing.T) {
	s := newOWServer(t, map[string]string{"apiKey": "GLOBAL-KEY", "units": "metric"})
	who := &callerIdentity{ID: "u1", Role: roleUser}
	res := s.resolveOpenWeather(context.Background(), who, nil)

	view := s.openWeatherView(who, res)
	scopes := view["scopes"].(map[string]any)
	user := scopes["user"].(map[string]any)
	fields := user["fields"].(map[string]osFieldView)

	if got := fields["apiKey"].Effective; got != openSkySecretMask {
		t.Errorf("apiKey effective = %q, want the mask (never the raw key)", got)
	}
	if fields["apiKey"].Source != "global" || !fields["apiKey"].Locked {
		t.Errorf("apiKey field = %+v, want source global + locked for a plain user", fields["apiKey"])
	}
	// A non-secret field is shown in the clear.
	if fields["units"].Effective != "metric" {
		t.Errorf("units effective = %q, want metric", fields["units"].Effective)
	}
}

func TestValidLatLon(t *testing.T) {
	ok := [][2]string{{"0", "0"}, {"52.2297", "21.0122"}, {"-90", "180"}, {"90", "-180"}}
	for _, c := range ok {
		if !validLatLon(c[0], c[1]) {
			t.Errorf("validLatLon(%q,%q) = false, want true", c[0], c[1])
		}
	}
	bad := [][2]string{{"", ""}, {"91", "0"}, {"0", "181"}, {"-91", "0"}, {"abc", "0"}, {"0", "x"}}
	for _, c := range bad {
		if validLatLon(c[0], c[1]) {
			t.Errorf("validLatLon(%q,%q) = true, want false", c[0], c[1])
		}
	}
}

// mergeOpenWeather must preserve sibling plugin keys (opensky/webdav) untouched.
func TestMergeOpenWeatherPreservesSiblings(t *testing.T) {
	existing := json.RawMessage(`{"opensky":{"enabled":true},"webdav":{"config":{"baseURL":"https://x"}}}`)
	out := mergeOpenWeather(existing, func(ow *owStored) {
		ow.Config.APIKey = "K"
		ow.Enabled = true
	})

	var doc map[string]json.RawMessage
	if err := json.Unmarshal(out, &doc); err != nil {
		t.Fatal(err)
	}
	if _, ok := doc["opensky"]; !ok {
		t.Error("opensky key was dropped by mergeOpenWeather")
	}
	if _, ok := doc["webdav"]; !ok {
		t.Error("webdav key was dropped by mergeOpenWeather")
	}
	var ow owStored
	if err := json.Unmarshal(doc["openweather"], &ow); err != nil {
		t.Fatal(err)
	}
	if ow.Config.APIKey != "K" || !ow.Enabled {
		t.Errorf("openweather entry = %+v, want APIKey K + enabled", ow)
	}
}

// A saved secret left at the mask on PUT must not be re-checked here, but the
// merge/keep logic lives in the handler; this guards the field/secret metadata
// the handler relies on stays consistent with the plugin descriptor.
func TestOpenWeatherFieldMetadata(t *testing.T) {
	if !owSecretKeys["apiKey"] {
		t.Error("apiKey must be a secret key")
	}
	// Every declared field must round-trip through owGet/owSet.
	var c owConfig
	for _, k := range owFields {
		owSet(&c, k, "v-"+k)
	}
	for _, k := range owFields {
		if owGet(c, k) != "v-"+k {
			t.Errorf("owGet/owSet mismatch for %q", k)
		}
	}
}