package api

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

	"github.com/kami/hexis/internal/domain"
	"github.com/kami/hexis/internal/execution"
	"github.com/kami/hexis/internal/nexusclient"
	"github.com/kami/hexis/internal/provider"
	"github.com/kami/hexis/internal/storage"
)

type targetTestProvider struct{}

func (targetTestProvider) Name() string { return "fake" }
func (targetTestProvider) Execute(ctx context.Context, c *domain.Capability, r *domain.ExecuteRequest) (map[string]any, error) {
	return map[string]any{"ok": true}, nil
}

// newTargetValidationServer wires a Handler against a stub Nexus that knows
// exactly one container entity, plus one capability scoped to containers.
func newTargetValidationServer(t *testing.T) (*http.ServeMux, *domain.Capability) {
	t.Helper()

	nexus := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch strings.TrimPrefix(r.URL.Path, "/api/v1/entities/") {
		case "ent_container_maven":
			json.NewEncoder(w).Encode(map[string]any{
				"id": "ent_container_maven", "type": "container", "state": "active",
			})
		case "ent_host_homesrv":
			json.NewEncoder(w).Encode(map[string]any{
				"id": "ent_host_homesrv", "type": "host", "state": "active",
			})
		default:
			w.WriteHeader(http.StatusNotFound)
			json.NewEncoder(w).Encode(map[string]string{"error": "entity not found"})
		}
	}))
	t.Cleanup(nexus.Close)

	store, err := storage.Open(filepath.Join(t.TempDir(), "hexis.db"))
	if err != nil {
		t.Fatalf("open store: %v", err)
	}
	t.Cleanup(func() { store.Close() })

	reg := provider.NewRegistry()
	reg.Register(targetTestProvider{})

	now := time.Now().UTC()
	cap := &domain.Capability{
		ID:          domain.NewCapabilityID(),
		Name:        "workspace.docker.restart",
		Provider:    "fake",
		Operation:   "noop",
		Risk:        "low",
		Enabled:     true,
		TargetTypes: []string{"container"},
		Attributes:  map[string]any{},
		CreatedAt:   now,
		UpdatedAt:   now,
		Version:     1,
	}
	if err := store.CreateCapability(cap); err != nil {
		t.Fatalf("create capability: %v", err)
	}

	engine := execution.New(store, reg, execution.WithEntityLookup(nexusclient.New(nexus.URL)))
	mux := http.NewServeMux()
	NewHandler(store, engine, testToken).Register(mux)
	return mux, cap
}

// TestExecuteHTTP_TargetValidation pins the HTTP status codes for each way a
// target can be refused (ECOSYSTEM-SPEC.md §4.3).
func TestExecuteHTTP_TargetValidation(t *testing.T) {
	mux, cap := newTargetValidationServer(t)

	cases := []struct {
		name   string
		target string
		want   int
	}{
		{"free text", "the maven container", http.StatusBadRequest},
		{"bare name", "maven", http.StatusBadRequest},
		{"unknown entity", "ent_not_real", http.StatusNotFound},
		{"wrong type", "ent_host_homesrv", http.StatusUnprocessableEntity},
		{"valid target", "ent_container_maven", http.StatusOK},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			body := `{"capability_id":"` + cap.ID + `","target_entity_id":"` + tc.target + `"}`
			req := httptest.NewRequest(http.MethodPost, "/api/v1/execute", strings.NewReader(body))
			req.Header.Set("Authorization", "Bearer "+testToken)
			w := httptest.NewRecorder()
			mux.ServeHTTP(w, req)

			if w.Code != tc.want {
				t.Fatalf("target %q: expected %d, got %d: %s", tc.target, tc.want, w.Code, w.Body.String())
			}
		})
	}
}