package openapi

import (
	"encoding/json"
	"os"
	"path/filepath"
	"regexp"
	"sort"
	"strings"
	"testing"
)

var routePattern = regexp.MustCompile(`HandleFunc\("([A-Z]+) (/[^"]*)"`)

func registeredRoutes(t *testing.T) map[string]bool {
	t.Helper()
	files, err := filepath.Glob("../*api/*.go")
	if err != nil {
		t.Fatal(err)
	}
	extra, _ := filepath.Glob("../apiwiring/*.go")
	files = append(files, extra...)
	files = append(files, "../../cmd/app/main.go")
	routes := map[string]bool{}
	for _, f := range files {
		if strings.HasSuffix(f, "_test.go") {
			continue
		}
		raw, err := os.ReadFile(f)
		if err != nil {
			t.Fatal(err)
		}
		for _, m := range routePattern.FindAllStringSubmatch(string(raw), -1) {
			routes[m[1]+" "+m[2]] = true
		}
	}
	return routes
}

// Vertragstest: jede registrierte Route ist beschrieben und umgekehrt.
func TestEveryRegisteredRouteIsDocumentedAndViceVersa(t *testing.T) {
	registered := registeredRoutes(t)
	if len(registered) < 40 {
		t.Fatalf("nur %d routen im quelltext gefunden, muster kaputt?", len(registered))
	}
	documented := map[string]bool{}
	for _, op := range Operations() {
		documented[op.Method+" "+op.Path] = true
	}
	var missing, stale []string
	for r := range registered {
		if !documented[r] {
			missing = append(missing, r)
		}
	}
	for d := range documented {
		if !registered[d] {
			stale = append(stale, d)
		}
	}
	sort.Strings(missing)
	sort.Strings(stale)
	if len(missing) > 0 {
		t.Errorf("routen ohne beschreibung: %v", missing)
	}
	if len(stale) > 0 {
		t.Errorf("beschriebene routen ohne implementierung: %v", stale)
	}
}

func TestEveryOperationDeclaresPermissionAndErrorSchema(t *testing.T) {
	var doc struct {
		Paths map[string]map[string]struct {
			Permission string                    `json:"x-permission"`
			Security   *[]any                    `json:"security"`
			Responses  map[string]map[string]any `json:"responses"`
		} `json:"paths"`
	}
	if err := json.Unmarshal(Document(), &doc); err != nil {
		t.Fatal(err)
	}
	for path, methods := range doc.Paths {
		for method, o := range methods {
			id := method + " " + path
			if o.Permission == "" {
				t.Errorf("%s: x-permission fehlt", id)
			}
			public := o.Security != nil && len(*o.Security) == 0
			if !public && !strings.HasPrefix(o.Permission, "dms.") {
				t.Errorf("%s: recht %q ausserhalb des dms-namensraums", id, o.Permission)
			}
			if !public {
				if _, ok := o.Responses["401"]; !ok {
					t.Errorf("%s: 401 nicht beschrieben", id)
				}
			}
			for status, resp := range o.Responses {
				if status[0] == '4' || status[0] == '5' {
					if !strings.Contains(toJSON(resp), "#/components/schemas/Error") {
						t.Errorf("%s: fehlerantwort %s ohne einheitliches Fehlerschema", id, status)
					}
				}
			}
		}
	}
}

func toJSON(v any) string {
	b, _ := json.Marshal(v)
	return string(b)
}

func TestMatchPrefersLiteralSegments(t *testing.T) {
	cases := []struct{ method, path, perm string }{
		{"GET", "/folders/children", "dms.folder.read"},
		{"GET", "/folders/abc/children", "dms.folder.read"},
		{"GET", "/documents/1/revisions/2/content", "dms.revision.read"},
		{"DELETE", "/documents/1/tags/2", "dms.tag.write"},
		{"POST", "/trash", "dms.trash.write"},
		{"POST", "/trash/purge", "dms.trash.purge"},
	}
	for _, c := range cases {
		op, ok := Match(c.method, c.path)
		if !ok || op.Permission != c.perm {
			t.Errorf("%s %s: %+v ok=%v, erwartet %s", c.method, c.path, op, ok, c.perm)
		}
	}
	if _, ok := Match("GET", "/gibt-es-nicht"); ok {
		t.Error("unbekannte route darf nicht matchen")
	}
	if _, ok := Match("PATCH", "/tags"); ok {
		t.Error("falsche methode darf nicht matchen")
	}
}

func TestPublicPathsAreExactlySignatureAndServiceRoutes(t *testing.T) {
	got := PublicPaths()
	for _, p := range []string{"/download", "/openapi.json", "/retention/destroy-callback", "/share/{token}"} {
		if !got[p] {
			t.Errorf("%s fehlt in PublicPaths", p)
		}
	}
	if len(got) != 4 {
		t.Errorf("unerwartete oeffentliche pfade: %v", got)
	}
}