package httpapi

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

	"basicstack.de/proofedmesh/services/admin-api/internal/attest"
	"basicstack.de/proofedmesh/services/admin-api/internal/store"
)

type recordingSigner struct {
	calls   int
	lastKey string
}

func (s *recordingSigner) SignDSSE(_ context.Context, keyRef string, stmt attest.Statement) (attest.Envelope, string, error) {
	s.calls++
	s.lastKey = keyRef
	env := attest.Envelope{
		PayloadType: "application/vnd.in-toto+json",
		Payload:     "ZmFrZS1wYXlsb2Fk",
		Signatures:  []attest.EnvelopeSignature{{KeyID: keyRef, Sig: "ZmFrZS1zaWc"}},
	}
	ch, _ := attest.EnvelopeContentHash(env)
	return env, ch, nil
}

type recordingSubmitter struct {
	calls int
	last  attest.LogReceipt
}

func (s *recordingSubmitter) Submit(_ context.Context, env attest.Envelope, ch string) (attest.LogReceipt, error) {
	s.calls++
	r := attest.LogReceipt{
		LogIndex:    int64(s.calls),
		ContentHash: ch,
		LoggedAt:    time.Now().UTC(),
	}
	s.last = r
	return r, nil
}

func TestCreate_WithAttestation_AttachesHash(t *testing.T) {
	sig := &recordingSigner{}
	sub := &recordingSubmitter{}
	deps := Dependencies{
		Store:  store.NewMemory(),
		Now:    func() time.Time { return time.Date(2026, 10, 25, 12, 0, 0, 0, time.UTC) },
		Attest: &attest.Orchestrator{Signer: sig, Submitter: sub, KeyRef: "trust-api/test-key"},
	}
	srv := httptest.NewServer(newMux(deps))
	defer srv.Close()

	body := `{"country":"DE","currency":"EUR","full_day":"28.00","partial_day_min8h":"14.00","arrival_day":"14.00","departure_day":"14.00","valid_from":"2026-01-01T00:00:00Z","source_regulation":"BMF 2026"}`
	req, _ := http.NewRequest("POST", srv.URL+"/admin/per-diem-rates/", strings.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusCreated {
		t.Fatalf("expected 201, got %d", resp.StatusCode)
	}
	var out map[string]map[string]any
	_ = json.NewDecoder(resp.Body).Decode(&out)
	ref, _ := out["rate"]["rate_change_attestation_ref"].(string)
	if !strings.HasPrefix(ref, "sha256:") || len(ref) != 71 {
		t.Fatalf("rate_change_attestation_ref not attached as sha256 hash: %q", ref)
	}
	if sig.calls != 1 || sub.calls != 1 {
		t.Fatalf("expected one signer + one submitter call, got signer=%d submitter=%d", sig.calls, sub.calls)
	}
	if sig.lastKey != "trust-api/test-key" {
		t.Errorf("key ref not passed through: %q", sig.lastKey)
	}
}

type failingSubmitter struct{}

func (failingSubmitter) Submit(_ context.Context, _ attest.Envelope, _ string) (attest.LogReceipt, error) {
	return attest.LogReceipt{}, &net503Error{}
}

type net503Error struct{}

func (*net503Error) Error() string { return "tlog: status 503: trillian down" }

func TestCreate_WithFailingTLog_RowPending(t *testing.T) {
	deps := Dependencies{
		Store:  store.NewMemory(),
		Now:    func() time.Time { return time.Date(2026, 10, 25, 12, 0, 0, 0, time.UTC) },
		Attest: &attest.Orchestrator{Signer: &recordingSigner{}, Submitter: failingSubmitter{}, KeyRef: "k"},
	}
	srv := httptest.NewServer(newMux(deps))
	defer srv.Close()

	body := `{"country":"DE","currency":"EUR","full_day":"28.00","partial_day_min8h":"14.00","arrival_day":"14.00","departure_day":"14.00","valid_from":"2026-01-01T00:00:00Z","source_regulation":"BMF 2026"}`
	req, _ := http.NewRequest("POST", srv.URL+"/admin/per-diem-rates/", strings.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	// Create still succeeds: Row exists, attestation pending.
	if resp.StatusCode != http.StatusCreated {
		t.Fatalf("expected 201 even when tlog is down, got %d", resp.StatusCode)
	}
	var out map[string]map[string]any
	_ = json.NewDecoder(resp.Body).Decode(&out)
	if _, hasRef := out["rate"]["rate_change_attestation_ref"]; hasRef {
		if v := out["rate"]["rate_change_attestation_ref"]; v != nil {
			t.Fatalf("expected no attestation ref when tlog is down, got %v", v)
		}
	}
}