package tide

import (
	"context"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"sync/atomic"
	"testing"
)

func TestManifestContract(t *testing.T) {
	ctx := context.Background()
	fixtures := t.TempDir()
	if err := os.MkdirAll(filepath.Join(fixtures, "routes"), 0o755); err != nil {
		t.Fatal(err)
	}

	var hits atomic.Int32
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		hits.Add(1)
		w.Header().Set("Content-Type", "application/json")
		switch r.URL.Path {
		case "/pass":
			_, _ = w.Write([]byte(`{"v":1}`))
		case "/fail":
			_, _ = w.Write([]byte(`{"v":2}`))
		default:
			_, _ = w.Write([]byte(`{"v":0}`))
		}
	}))
	t.Cleanup(srv.Close)

	writeRouteFixture(t, srv.URL, fixtures, "pass", "/pass", `{"v":1}`)
	writeRouteFixture(t, srv.URL, fixtures, "fail", "/fail", `{"v":1}`)

	m := Manifest{
		Version:    1,
		AuthGroups: []string{"public"},
		Routes: []Route{
			routeEntry("GET /pass public", "/pass", StatusPorted, "routes/pass.yaml"),
			routeEntry("GET /fail public", "/fail", StatusPorted, "routes/fail.yaml"),
			{ID: "GET /none public", Method: http.MethodGet, Path: "/none", AuthGroup: "public", Status: StatusPending},
		},
	}
	before := hits.Load()
	cov, err := ReplayManifest(ctx, m, ManifestConfig{Target: srv.URL, Fixtures: fixtures, Mode: ModeRequireRecorded})
	if err == nil {
		t.Fatal("ported fail plus unrecorded required must be nonzero")
	}
	if cov.Passing != 1 || cov.Failing != 1 || cov.Unrecorded != 1 || cov.Recorded != 2 {
		t.Fatalf("coverage %+v", cov)
	}
	if cov.Pending != 1 || cov.Ported != 2 {
		t.Fatalf("pending/ported counts %+v", cov)
	}
	if !strings.Contains(cov.SummaryLine(), "recorded 2/3") {
		t.Fatalf("summary %s", cov.SummaryLine())
	}
	if hits.Load()-before != 2 {
		t.Fatalf("comparison failure must still replay later recorded flows, extra hits=%d", hits.Load()-before)
	}
	foundFailPath := false
	for _, d := range cov.Diffs {
		if strings.Contains(d, "GET /fail public") && (strings.Contains(d, "$.v") || strings.Contains(d, ".v")) {
			foundFailPath = true
		}
	}
	if !foundFailPath {
		t.Fatalf("coverage diffs missing path for failing route: %v", cov.Diffs)
	}

	t.Run("pending mismatch is measured not fatal", func(t *testing.T) {
		pending := Manifest{
			Version:    1,
			AuthGroups: []string{"public"},
			Routes:     []Route{routeEntry("GET /fail public", "/fail", StatusPending, "routes/fail.yaml")},
		}
		cov, err := ReplayManifest(ctx, pending, ManifestConfig{Target: srv.URL, Fixtures: fixtures})
		if err != nil {
			t.Fatalf("pending mismatch must not fail: %v", err)
		}
		if cov.Failing != 1 || cov.Passing != 0 {
			t.Fatalf("pending failing %+v", cov)
		}
		if _, err := ReplayManifest(ctx, pending, ManifestConfig{Target: srv.URL, Fixtures: fixtures, SelfCheck: true}); err == nil {
			t.Fatal("self-check must fail pending mismatches")
		}
	})

	t.Run("require-recorded reports unrecorded", func(t *testing.T) {
		empty := Manifest{
			Version:    1,
			AuthGroups: []string{"public"},
			Routes: []Route{{
				ID: "GET /ghost public", Method: http.MethodGet, Path: "/ghost",
				AuthGroup: "public", Status: StatusPending,
			}},
		}
		if err := ValidateManifest(empty, fixtures, ModeAllowIncomplete); err != nil {
			t.Fatal(err)
		}
		if err := ValidateManifest(empty, fixtures, ModeRequireRecorded); err == nil {
			t.Fatal("missing cases must fail require-recorded")
		}
		cov, err := ReplayManifest(ctx, empty, ManifestConfig{Target: srv.URL, Fixtures: fixtures, Mode: ModeRequireRecorded})
		if err == nil {
			t.Fatal("unrecorded required must error")
		}
		if cov.Unrecorded != 1 || cov.Passing != 0 {
			t.Fatalf("unrecorded coverage %+v", cov)
		}
	})
}