package api_test

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

	"github.com/go-chi/chi/v5"

	"vetting/internal/api"
	"vetting/internal/db"
	"vetting/internal/events"
	"vetting/internal/model"
	"vetting/internal/orchestrator"
	"vetting/internal/store"
)

// setupHeartbeat wires just enough of UI to exercise the heartbeat
// handler. Runner is left nil by default — the Phase-2 command path
// short-circuits to idle when Runner is absent, which is fine for the
// "no run yet" happy path. Callers that want to drive the Phase-2
// transition use setupHeartbeatWithRunner.
func setupHeartbeat(t *testing.T) (*api.UI, *store.Hosts) {
	t.Helper()
	conn, err := db.Open(filepath.Join(t.TempDir(), "vetting.db"))
	if err != nil {
		t.Fatalf("open db: %v", err)
	}
	t.Cleanup(func() { _ = conn.Close() })
	hosts := &store.Hosts{DB: conn}
	return &api.UI{Hosts: hosts}, hosts
}

// setupHeartbeatWithRunner also wires a Runs store + Runner so
// Phase-2 tests can exercise the Queued → WaitingWoL transition and
// the 10-minute WaitingWoL re-issue window.
func setupHeartbeatWithRunner(t *testing.T) (*api.UI, *store.Hosts, *store.Runs) {
	t.Helper()
	conn, err := db.Open(filepath.Join(t.TempDir(), "vetting.db"))
	if err != nil {
		t.Fatalf("open db: %v", err)
	}
	t.Cleanup(func() { _ = conn.Close() })
	hosts := &store.Hosts{DB: conn}
	runs := &store.Runs{DB: conn}
	stages := &store.Stages{DB: conn}
	hub := events.NewHub()
	runner := &orchestrator.Runner{Runs: runs, Hosts: hosts, Stages: stages, EventHub: hub}
	ui := &api.UI{Hosts: hosts, Runs: runs, Runner: runner}
	return ui, hosts, runs
}

func heartbeatReq(mac string) *http.Request {
	req := httptest.NewRequest(http.MethodPost, "/api/v1/hosts/"+mac+"/heartbeat", nil)
	rctx := chi.NewRouteContext()
	rctx.URLParams.Add("mac", mac)
	return req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))
}

func TestUIHeartbeat_Success(t *testing.T) {
	ui, hosts := setupHeartbeat(t)
	id, err := hosts.Create(context.Background(), model.Host{
		Name:             "hb-host",
		MAC:              "aa:bb:cc:dd:ee:10",
		WoLBroadcastIP:   "10.0.0.255",
		WoLPort:          9,
		ExpectedSpecYAML: "memory:\n  total_gib: 16\n",
	})
	if err != nil {
		t.Fatalf("create: %v", err)
	}

	before := time.Now().UTC().Add(-time.Second)
	rr := httptest.NewRecorder()
	ui.Heartbeat(rr, heartbeatReq("aa:bb:cc:dd:ee:10"))
	if rr.Code != http.StatusOK {
		t.Fatalf("status = %d, body = %q", rr.Code, rr.Body.String())
	}
	var resp map[string]any
	if err := json.Unmarshal(rr.Body.Bytes(), &resp); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if resp["ok"] != true {
		t.Fatalf("response = %v, want ok:true", resp)
	}

	got, err := hosts.Get(context.Background(), id)
	if err != nil {
		t.Fatalf("Get: %v", err)
	}
	if got.LastSeenAt == nil {
		t.Fatalf("LastSeenAt not stamped")
	}
	if got.LastSeenAt.Before(before) {
		t.Fatalf("LastSeenAt = %v, want >= %v", got.LastSeenAt, before)
	}
}

func TestUIHeartbeat_UnknownMAC(t *testing.T) {
	ui, _ := setupHeartbeat(t)
	rr := httptest.NewRecorder()
	ui.Heartbeat(rr, heartbeatReq("aa:bb:cc:dd:ee:ff"))
	if rr.Code != http.StatusNotFound {
		t.Fatalf("status = %d, want 404", rr.Code)
	}
	var resp map[string]string
	_ = json.NewDecoder(rr.Body).Decode(&resp)
	if resp["error"] == "" {
		t.Fatalf("missing error body")
	}
}

func TestUIHeartbeat_BadMAC(t *testing.T) {
	ui, _ := setupHeartbeat(t)
	rr := httptest.NewRecorder()
	ui.Heartbeat(rr, heartbeatReq("not-a-mac"))
	if rr.Code != http.StatusBadRequest {
		t.Fatalf("status = %d, want 400", rr.Code)
	}
}

func TestUIHeartbeat_QueuedDispatches(t *testing.T) {
	ui, hosts, runs := setupHeartbeatWithRunner(t)
	ctx := context.Background()
	hostID, err := hosts.Create(ctx, model.Host{
		Name:             "hb-dispatch",
		MAC:              "aa:bb:cc:dd:ee:20",
		WoLBroadcastIP:   "10.0.0.255",
		WoLPort:          9,
		ExpectedSpecYAML: "memory:\n  total_gib: 16\n",
	})
	if err != nil {
		t.Fatalf("create host: %v", err)
	}
	runID, err := runs.Create(ctx, hostID, "deadbeef")
	if err != nil {
		t.Fatalf("create run: %v", err)
	}

	rr := httptest.NewRecorder()
	ui.Heartbeat(rr, heartbeatReq("aa:bb:cc:dd:ee:20"))
	if rr.Code != http.StatusOK {
		t.Fatalf("status = %d, body = %q", rr.Code, rr.Body.String())
	}
	var resp struct {
		OK    bool   `json:"ok"`
		Cmd   string `json:"cmd"`
		RunID int64  `json:"run_id"`
	}
	if err := json.Unmarshal(rr.Body.Bytes(), &resp); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if resp.Cmd != "reboot_for_vetting" || resp.RunID != runID {
		t.Fatalf("response = %+v, want cmd=reboot_for_vetting run_id=%d", resp, runID)
	}
	// Run advanced Queued → WaitingWoL via the state machine.
	got, err := runs.Get(ctx, runID)
	if err != nil {
		t.Fatalf("get run: %v", err)
	}
	if got.State != model.StateWaitingWoL {
		t.Fatalf("state = %s, want WaitingWoL", got.State)
	}
}

func TestUIHeartbeat_WaitingWoLRetries(t *testing.T) {
	ui, hosts, runs := setupHeartbeatWithRunner(t)
	ctx := context.Background()
	hostID, err := hosts.Create(ctx, model.Host{
		Name:             "hb-retry",
		MAC:              "aa:bb:cc:dd:ee:21",
		WoLBroadcastIP:   "10.0.0.255",
		WoLPort:          9,
		ExpectedSpecYAML: "memory:\n  total_gib: 16\n",
	})
	if err != nil {
		t.Fatalf("create host: %v", err)
	}
	runID, err := runs.Create(ctx, hostID, "deadbeef")
	if err != nil {
		t.Fatalf("create run: %v", err)
	}
	// Simulate: dispatcher already moved the run to WaitingWoL, now
	// the host's reporter comes back from a crashed reboot.
	if err := runs.SetState(ctx, runID, model.StateWaitingWoL); err != nil {
		t.Fatalf("set state: %v", err)
	}

	rr := httptest.NewRecorder()
	ui.Heartbeat(rr, heartbeatReq("aa:bb:cc:dd:ee:21"))
	var resp struct {
		Cmd   string `json:"cmd"`
		RunID int64  `json:"run_id"`
	}
	_ = json.Unmarshal(rr.Body.Bytes(), &resp)
	if resp.Cmd != "reboot_for_vetting" || resp.RunID != runID {
		t.Fatalf("response = %+v, want reboot_for_vetting retry", resp)
	}
}

func TestUIHeartbeat_NoRunIsIdle(t *testing.T) {
	ui, hosts, _ := setupHeartbeatWithRunner(t)
	if _, err := hosts.Create(context.Background(), model.Host{
		Name:             "hb-idle",
		MAC:              "aa:bb:cc:dd:ee:22",
		WoLBroadcastIP:   "10.0.0.255",
		WoLPort:          9,
		ExpectedSpecYAML: "memory:\n  total_gib: 16\n",
	}); err != nil {
		t.Fatalf("create host: %v", err)
	}
	rr := httptest.NewRecorder()
	ui.Heartbeat(rr, heartbeatReq("aa:bb:cc:dd:ee:22"))
	// Idle = cmd omitted entirely; the agent's heartbeatResponse
	// decodes that as "", and handleResponse bails early.
	body := rr.Body.String()
	if strings.Contains(body, "reboot_for_vetting") {
		t.Fatalf("idle host got reboot cmd: %s", body)
	}
	if strings.Contains(body, `"cmd"`) {
		t.Fatalf("idle response should omit cmd, got: %s", body)
	}
}

func TestUIHeartbeat_CompletedRunIsIdle(t *testing.T) {
	ui, hosts, runs := setupHeartbeatWithRunner(t)
	ctx := context.Background()
	hostID, err := hosts.Create(ctx, model.Host{
		Name:             "hb-done",
		MAC:              "aa:bb:cc:dd:ee:23",
		WoLBroadcastIP:   "10.0.0.255",
		WoLPort:          9,
		ExpectedSpecYAML: "memory:\n  total_gib: 16\n",
	})
	if err != nil {
		t.Fatalf("create host: %v", err)
	}
	runID, err := runs.Create(ctx, hostID, "deadbeef")
	if err != nil {
		t.Fatalf("create run: %v", err)
	}
	if err := runs.SetState(ctx, runID, model.StateCompleted); err != nil {
		t.Fatalf("set state: %v", err)
	}
	rr := httptest.NewRecorder()
	ui.Heartbeat(rr, heartbeatReq("aa:bb:cc:dd:ee:23"))
	body := rr.Body.String()
	if strings.Contains(body, "reboot_for_vetting") {
		t.Fatalf("completed run returned reboot cmd: %s", body)
	}
}