package spindle

import (
	"context"
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"path/filepath"
	"testing"
	"time"

	kgit "tangled.org/core/knotserver/git"
	"tangled.org/core/spindle/config"
	"tangled.org/core/spindle/db"
	"tangled.org/core/spindle/mill/executor"
	"tangled.org/core/spindle/models"
	"tangled.org/core/spindle/observability"
)

func TestHasSkipCIPushOption(t *testing.T) {
	tests := []struct {
		name        string
		pushOptions []string
		want        bool
	}{
		{
			name:        "skip-ci requests skip",
			pushOptions: []string{"skip-ci"},
			want:        true,
		},
		{
			name:        "ci-skip requests skip",
			pushOptions: []string{"ci-skip"},
			want:        true,
		},
		{
			name:        "unrelated ci options do not skip",
			pushOptions: []string{"verbose-ci", "ci-verbose"},
			want:        false,
		},
		{
			name:        "empty options do not skip",
			pushOptions: []string{},
			want:        false,
		},
		{
			name:        "nil options do not skip",
			pushOptions: nil,
			want:        false,
		},
		{
			name:        "mixed options skip when any skip option appears",
			pushOptions: []string{"verbose-ci", "skip-ci", "ci-verbose"},
			want:        true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := kgit.HasSkipCIPushOption(tt.pushOptions)
			if got != tt.want {
				t.Fatalf("hasSkipCIPushOption(%v) = %v, want %v", tt.pushOptions, got, tt.want)
			}
		})
	}
}

func TestExecutorRoleBuildsMinimalSpindle(t *testing.T) {
	ctx := context.Background()
	dbPath := filepath.Join(t.TempDir(), "spindle.db")
	d, err := db.Make(ctx, dbPath)
	if err != nil {
		t.Fatalf("db.Make() error = %v", err)
	}

	cfg := &config.Config{Role: config.RoleExecutor}
	cfg.Server.DBPath = dbPath
	cfg.Server.Hostname = "executor.test"
	cfg.Server.Tap.Embed = true
	cfg.ArtifactStores.Disk.Dir = t.TempDir()
	cfg.Mill.ArtifactStore = "disk"

	s, err := New(ctx, cfg, d, map[string]models.Engine{}, nil)
	if err != nil {
		t.Fatalf("New() error = %v", err)
	}

	if s.jc != nil || s.tap != nil || s.e != nil || s.feed != nil || s.res != nil || s.vault != nil || s.scheduler != nil {
		t.Fatal("executor role built coordinator-only spindle dependencies")
	}

	rr := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/", nil)
	s.Router().ServeHTTP(rr, req)
	if rr.Code != http.StatusOK {
		t.Fatalf("root status = %d, want %d", rr.Code, http.StatusOK)
	}
	rr = httptest.NewRecorder()
	req = httptest.NewRequest(http.MethodGet, "/_health", nil)
	s.Router().ServeHTTP(rr, req)
	if rr.Code != http.StatusOK {
		t.Fatalf("health status = %d, want %d", rr.Code, http.StatusOK)
	}
	if got := rr.Header().Get("Content-Type"); got != "application/json" {
		t.Fatalf("health content type = %q, want application/json", got)
	}
	if got := rr.Body.String(); got != "{\"status\":\"ok\"}\n" {
		t.Fatalf("health response = %q, want JSON ok status", got)
	}

	rr = httptest.NewRecorder()
	req = httptest.NewRequest(http.MethodGet, "/xrpc/_health", nil)
	s.Router().ServeHTTP(rr, req)
	if rr.Code != http.StatusNotFound {
		t.Fatalf("executor xrpc status = %d, want %d", rr.Code, http.StatusNotFound)
	}
}

type drainTestExecutor struct {
	connected    chan struct{}
	connectCtx   chan context.Context
	disconnected chan struct{}
	drainStarted chan struct{}
	releaseDrain chan struct{}
}

func (e *drainTestExecutor) Connect(ctx context.Context) {
	e.connectCtx <- ctx
	close(e.connected)
	<-ctx.Done()
	close(e.disconnected)
}

func (e *drainTestExecutor) Drain(ctx context.Context) error {
	close(e.drainStarted)
	select {
	case <-e.releaseDrain:
		return nil
	case <-ctx.Done():
		return ctx.Err()
	}
}

func (e *drainTestExecutor) RegisterMetrics(*observability.Metrics) {}

func (e *drainTestExecutor) SetQuotaClient(*executor.QuotaClient) {}

func TestExecutorShutdownDrainsBeforeDisconnecting(t *testing.T) {
	exec := &drainTestExecutor{
		connected:    make(chan struct{}),
		connectCtx:   make(chan context.Context, 1),
		disconnected: make(chan struct{}),
		drainStarted: make(chan struct{}),
		releaseDrain: make(chan struct{}, 1),
	}
	t.Cleanup(func() {
		select {
		case exec.releaseDrain <- struct{}{}:
		default:
		}
	})

	cfg := &config.Config{Role: config.RoleExecutor}
	cfg.Server.ListenAddr = "127.0.0.1:0"
	cfg.Mill.DrainTimeout = 2 * time.Second
	s := &Spindle{
		cfg:     cfg,
		exec:    exec,
		l:       slog.New(slog.NewTextHandler(io.Discard, nil)),
		jobWake: make(chan struct{}, 1),
	}

	ctx, cancel := context.WithCancel(context.Background())
	done := make(chan error, 1)
	go func() {
		done <- s.Start(ctx)
	}()

	select {
	case <-exec.connected:
	case <-time.After(2 * time.Second):
		t.Fatal("executor did not connect")
	}
	connectCtx := <-exec.connectCtx
	cancel()

	select {
	case <-exec.drainStarted:
	case <-time.After(2 * time.Second):
		t.Fatal("executor drain did not start")
	}
	if err := connectCtx.Err(); err != nil {
		t.Fatalf("Connect context canceled during drain: %v", err)
	}
	select {
	case <-exec.disconnected:
		t.Fatal("executor disconnected before drain completed")
	case err := <-done:
		t.Fatalf("Start returned before drain completed: %v", err)
	default:
	}

	exec.releaseDrain <- struct{}{}

	select {
	case <-exec.disconnected:
	case <-time.After(2 * time.Second):
		t.Fatal("executor did not disconnect after drain completed")
	}
	select {
	case err := <-done:
		if err != nil {
			t.Fatalf("Start() error = %v", err)
		}
	case <-time.After(2 * time.Second):
		t.Fatal("Start did not return after executor shutdown")
	}
}

func TestExecutorListenerFailureDrainsBeforeDisconnecting(t *testing.T) {
	exec := &drainTestExecutor{
		connected:    make(chan struct{}),
		connectCtx:   make(chan context.Context, 1),
		disconnected: make(chan struct{}),
		drainStarted: make(chan struct{}),
		releaseDrain: make(chan struct{}, 1),
	}
	cfg := &config.Config{Role: config.RoleExecutor}
	cfg.Server.ListenAddr = "127.0.0.1:-1"
	cfg.Mill.DrainTimeout = 2 * time.Second
	s := &Spindle{
		cfg:     cfg,
		exec:    exec,
		l:       slog.New(slog.NewTextHandler(io.Discard, nil)),
		jobWake: make(chan struct{}, 1),
	}

	done := make(chan error, 1)
	go func() {
		done <- s.Start(context.Background())
	}()
	<-exec.connected
	connectCtx := <-exec.connectCtx
	select {
	case <-exec.drainStarted:
	case <-time.After(2 * time.Second):
		t.Fatal("listener failure did not start executor drain")
	}
	if err := connectCtx.Err(); err != nil {
		t.Fatalf("Connect context canceled during drain: %v", err)
	}
	select {
	case <-exec.disconnected:
		t.Fatal("executor disconnected before drain completed")
	default:
	}

	exec.releaseDrain <- struct{}{}
	select {
	case err := <-done:
		if err == nil {
			t.Fatal("Start discarded the listener error")
		}
	case <-time.After(2 * time.Second):
		t.Fatal("Start did not return after listener failure cleanup")
	}
}

func TestNewOwnsLifecycleContextBeforeStart(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	dbPath := filepath.Join(t.TempDir(), "spindle.db")
	d, err := db.Make(ctx, dbPath)
	if err != nil {
		t.Fatal(err)
	}
	cfg := &config.Config{Role: config.RoleExecutor}
	cfg.Server.DBPath = dbPath
	cfg.Server.Hostname = "executor.test"
	cfg.ArtifactStores.Disk.Dir = t.TempDir()
	cfg.Mill.ArtifactStore = "disk"

	s, err := New(ctx, cfg, d, map[string]models.Engine{}, nil)
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(s.rootCancel)
	cancel()
	if err := s.rootCtx.Err(); err != nil {
		t.Fatalf("lifecycle context inherited caller cancellation: %v", err)
	}
}