package api

import (
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"forge.secuaas.ovh/olivier/claude-failover/internal/delegation"
	"forge.secuaas.ovh/olivier/claude-failover/internal/state"
)

// fakeDelegation implements DelegationProvider for tests.
type fakeDelegation struct {
	active   []delegation.ActiveJob
	snapshot delegation.Snapshot
}

func (f *fakeDelegation) Active() []delegation.ActiveJob { return f.active }
func (f *fakeDelegation) CountersSnapshot() delegation.Snapshot { return f.snapshot }

func newTestServer(t *testing.T, deleg DelegationProvider) *httptest.Server {
	t.Helper()
	s := New("ignored", state.New(""))
	if deleg != nil {
		s.WithDelegation(deleg)
	}
	mux := http.NewServeMux()
	mux.HandleFunc("/health", s.handleHealth)
	mux.HandleFunc("/status", s.handleStatus)
	mux.HandleFunc("/watchdog/status", s.handleWatchdogStatus)
	mux.HandleFunc("/api/delegated/status", s.handleDelegatedStatus)
	return httptest.NewServer(mux)
}

func TestHandleHealth(t *testing.T) {
	srv := newTestServer(t, nil)
	defer srv.Close()
	resp, err := http.Get(srv.URL + "/health")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	if !strings.Contains(string(body), `"status":"ok"`) {
		t.Errorf("unexpected /health body: %s", body)
	}
}

func TestHandleDelegatedStatus_Disabled(t *testing.T) {
	srv := newTestServer(t, nil)
	defer srv.Close()
	resp, err := http.Get(srv.URL + "/api/delegated/status")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusNotFound {
		t.Errorf("expected 404 when delegation disabled, got %d", resp.StatusCode)
	}
}

func TestHandleDelegatedStatus_Enabled(t *testing.T) {
	deleg := &fakeDelegation{
		active: []delegation.ActiveJob{
			{JobID: "j1", Project: "/p/a", TaskFile: "task-1.md", Provider: "gpu", Duration: "12s"},
		},
		snapshot: delegation.Snapshot{Active: 1, CompletedTotal: 5, FailedTotal: 1},
	}
	srv := newTestServer(t, deleg)
	defer srv.Close()

	resp, err := http.Get(srv.URL + "/api/delegated/status")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("expected 200, got %d", resp.StatusCode)
	}
	var out struct {
		Active   []delegation.ActiveJob `json:"active"`
		Counters delegation.Snapshot    `json:"counters"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&out); err != nil {
		t.Fatal(err)
	}
	if len(out.Active) != 1 || out.Active[0].JobID != "j1" {
		t.Errorf("active mismatch: %+v", out.Active)
	}
	if out.Counters.CompletedTotal != 5 || out.Counters.Active != 1 {
		t.Errorf("counters mismatch: %+v", out.Counters)
	}
}

func TestHandleWatchdogStatus_IncludesDelegationCounters(t *testing.T) {
	deleg := &fakeDelegation{snapshot: delegation.Snapshot{
		Active: 2, CompletedTotal: 7, FailedTotal: 3,
	}}
	srv := newTestServer(t, deleg)
	defer srv.Close()

	resp, err := http.Get(srv.URL + "/watchdog/status")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	for _, want := range []string{`"delegated_active":2`, `"delegated_completed_total":7`, `"delegated_failed_total":3`} {
		if !strings.Contains(string(body), want) {
			t.Errorf("missing %s in body: %s", want, body)
		}
	}
}