package registry

import (
	"context"
	"errors"
	"sync"
	"testing"
	"time"

	"github.com/DATA-DOG/go-sqlmock"
	"github.com/Molecule-AI/molecule-monorepo/platform/internal/models"
)

// fakeEmitter records every RecordAndBroadcast call so tests can assert
// payload shape + emission count. Safe for concurrent use since the sweeper
// itself is single-goroutine but keeping the lock lets the suite fan out.
type fakeEmitter struct {
	mu     sync.Mutex
	events []emittedEvent
	fail   bool
}

type emittedEvent struct {
	Type        string
	WorkspaceID string
	Payload     interface{}
}

func (f *fakeEmitter) RecordAndBroadcast(_ context.Context, eventType string, workspaceID string, payload interface{}) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.events = append(f.events, emittedEvent{eventType, workspaceID, payload})
	if f.fail {
		return errors.New("broadcast boom")
	}
	return nil
}

func (f *fakeEmitter) count() int {
	f.mu.Lock()
	defer f.mu.Unlock()
	return len(f.events)
}

// candidateRows builds the new-shape query result (id, runtime, age_sec).
// Use this in every sweep test to match the runtime-aware SELECT.
func candidateRows(rows ...[3]any) *sqlmock.Rows {
	r := sqlmock.NewRows([]string{"id", "runtime", "age_sec"})
	for _, row := range rows {
		r = r.AddRow(row[0], row[1], row[2])
	}
	return r
}

// TestSweepStuckProvisioning_FlipsOverdue verifies the happy path: a stuck
// provisioning workspace gets flipped to failed AND an event is broadcast.
func TestSweepStuckProvisioning_FlipsOverdue(t *testing.T) {
	mock := setupTestDB(t)

	// claude-code workspace, 700s old > 600s default timeout → flipped.
	mock.ExpectQuery(`SELECT id, COALESCE\(runtime, ''\), EXTRACT`).
		WillReturnRows(candidateRows([3]any{"ws-stuck", "claude-code", 700}))

	mock.ExpectExec(`UPDATE workspaces`).
		WithArgs("ws-stuck", sqlmock.AnyArg(), sqlmock.AnyArg(), models.StatusFailed).
		WillReturnResult(sqlmock.NewResult(0, 1))

	emit := &fakeEmitter{}
	sweepStuckProvisioning(context.Background(), emit)

	if emit.count() != 1 {
		t.Fatalf("expected 1 event, got %d", emit.count())
	}
	if emit.events[0].Type != "WORKSPACE_PROVISION_FAILED" {
		t.Errorf("event type = %q, want WORKSPACE_PROVISION_FAILED", emit.events[0].Type)
	}
	if emit.events[0].WorkspaceID != "ws-stuck" {
		t.Errorf("workspace id = %q, want ws-stuck", emit.events[0].WorkspaceID)
	}
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Errorf("unmet expectations: %v", err)
	}
}

// TestSweepStuckProvisioning_HermesGets30MinSlack — the regression that
// motivated the runtime-aware change. A hermes workspace 11 min into
// cold-boot must NOT be flipped to failed; the watcher's 25-min budget
// covers it. Without the fix, the 10-min sweep killed healthy hermes
// boots mid-install (issue #2061's E2E failure on 2026-04-26).
func TestSweepStuckProvisioning_HermesGets30MinSlack(t *testing.T) {
	mock := setupTestDB(t)

	// 11 min = 660 sec. < HermesProvisioningTimeout (1800s).
	// No UPDATE should fire — hermes still has time.
	mock.ExpectQuery(`SELECT id, COALESCE\(runtime, ''\), EXTRACT`).
		WillReturnRows(candidateRows([3]any{"ws-hermes-booting", "hermes", 660}))

	emit := &fakeEmitter{}
	sweepStuckProvisioning(context.Background(), emit)

	if emit.count() != 0 {
		t.Fatalf("hermes at 11min should NOT have been flipped, got %d events", emit.count())
	}
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Errorf("unmet expectations: %v", err)
	}
}

// TestSweepStuckProvisioning_HermesPastDeadline — a hermes workspace
// past 30 min DOES get flipped. Closes the loop on the runtime-aware
// fix: it's still bounded, just with a longer threshold than other
// runtimes.
func TestSweepStuckProvisioning_HermesPastDeadline(t *testing.T) {
	mock := setupTestDB(t)

	// 31 min = 1860 sec > HermesProvisioningTimeout (1800s).
	mock.ExpectQuery(`SELECT id, COALESCE\(runtime, ''\), EXTRACT`).
		WillReturnRows(candidateRows([3]any{"ws-hermes-stuck", "hermes", 1860}))
	mock.ExpectExec(`UPDATE workspaces`).
		WithArgs("ws-hermes-stuck", sqlmock.AnyArg(), sqlmock.AnyArg(), models.StatusFailed).
		WillReturnResult(sqlmock.NewResult(0, 1))

	emit := &fakeEmitter{}
	sweepStuckProvisioning(context.Background(), emit)

	if emit.count() != 1 {
		t.Fatalf("hermes past 30min must be flipped, got %d events", emit.count())
	}
	// Payload should include runtime so ops can distinguish in logs.
	payload, ok := emit.events[0].Payload.(map[string]interface{})
	if !ok {
		t.Fatalf("payload not a map: %T", emit.events[0].Payload)
	}
	if payload["runtime"] != "hermes" {
		t.Errorf("payload.runtime = %v, want hermes", payload["runtime"])
	}
}

// TestSweepStuckProvisioning_RaceSafe covers the case where UPDATE affects
// 0 rows because the workspace flipped to online (or got restarted) between
// the SELECT and the UPDATE. We should skip the event, not emit a false
// WORKSPACE_PROVISION_FAILED.
func TestSweepStuckProvisioning_RaceSafe(t *testing.T) {
	mock := setupTestDB(t)

	mock.ExpectQuery(`SELECT id, COALESCE\(runtime, ''\), EXTRACT`).
		WillReturnRows(candidateRows([3]any{"ws-raced", "claude-code", 700}))

	mock.ExpectExec(`UPDATE workspaces`).
		WithArgs("ws-raced", sqlmock.AnyArg(), sqlmock.AnyArg(), models.StatusFailed).
		WillReturnResult(sqlmock.NewResult(0, 0)) // 0 rows — raced

	emit := &fakeEmitter{}
	sweepStuckProvisioning(context.Background(), emit)

	if emit.count() != 0 {
		t.Errorf("expected 0 events on race, got %d", emit.count())
	}
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Errorf("unmet expectations: %v", err)
	}
}

// TestSweepStuckProvisioning_NoStuck verifies that an empty candidate list
// produces no events and no update queries.
func TestSweepStuckProvisioning_NoStuck(t *testing.T) {
	mock := setupTestDB(t)

	mock.ExpectQuery(`SELECT id, COALESCE\(runtime, ''\), EXTRACT`).
		WillReturnRows(candidateRows())

	emit := &fakeEmitter{}
	sweepStuckProvisioning(context.Background(), emit)

	if emit.count() != 0 {
		t.Errorf("expected 0 events when nothing stuck, got %d", emit.count())
	}
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Errorf("unmet expectations: %v", err)
	}
}

// TestSweepStuckProvisioning_MultipleStuck covers the realistic case where
// both agents (claude-code + hermes) are stuck — both should get flipped
// and both should get events. claude-code at 11 min (over its 10-min
// limit), hermes at 31 min (over its 30-min limit).
func TestSweepStuckProvisioning_MultipleStuck(t *testing.T) {
	mock := setupTestDB(t)

	mock.ExpectQuery(`SELECT id, COALESCE\(runtime, ''\), EXTRACT`).
		WillReturnRows(candidateRows(
			[3]any{"ws-claude-code", "claude-code", 700},
			[3]any{"ws-hermes", "hermes", 1860},
		))

	mock.ExpectExec(`UPDATE workspaces`).
		WithArgs("ws-claude-code", sqlmock.AnyArg(), sqlmock.AnyArg(), models.StatusFailed).
		WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectExec(`UPDATE workspaces`).
		WithArgs("ws-hermes", sqlmock.AnyArg(), sqlmock.AnyArg(), models.StatusFailed).
		WillReturnResult(sqlmock.NewResult(0, 1))

	emit := &fakeEmitter{}
	sweepStuckProvisioning(context.Background(), emit)

	if emit.count() != 2 {
		t.Fatalf("expected 2 events, got %d", emit.count())
	}
}

// TestSweepStuckProvisioning_BroadcastFailureDoesNotCrash ensures the
// sweeper tolerates a broadcast error (Redis hiccup) — the DB row is
// already flipped so the state stays coherent.
func TestSweepStuckProvisioning_BroadcastFailureDoesNotCrash(t *testing.T) {
	mock := setupTestDB(t)

	mock.ExpectQuery(`SELECT id, COALESCE\(runtime, ''\), EXTRACT`).
		WillReturnRows(candidateRows([3]any{"ws-stuck", "claude-code", 700}))
	mock.ExpectExec(`UPDATE workspaces`).
		WithArgs("ws-stuck", sqlmock.AnyArg(), sqlmock.AnyArg(), models.StatusFailed).
		WillReturnResult(sqlmock.NewResult(0, 1))

	emit := &fakeEmitter{fail: true}
	// Must not panic.
	sweepStuckProvisioning(context.Background(), emit)
}

// TestProvisioningTimeout_EnvOverride verifies PROVISION_TIMEOUT_SECONDS
// env var takes effect when set to a positive integer, and falls back to
// the per-runtime default otherwise.
func TestProvisioningTimeout_EnvOverride(t *testing.T) {
	t.Setenv("PROVISION_TIMEOUT_SECONDS", "60")
	// When env override is set it wins over runtime defaults.
	if got := provisioningTimeoutFor(""); got.Seconds() != 60 {
		t.Errorf("override (no runtime): got %v, want 60s", got)
	}
	if got := provisioningTimeoutFor("hermes"); got.Seconds() != 60 {
		t.Errorf("override (hermes): got %v, want 60s", got)
	}
	t.Setenv("PROVISION_TIMEOUT_SECONDS", "")
	if got := provisioningTimeoutFor(""); got != DefaultProvisioningTimeout {
		t.Errorf("default (no runtime): got %v, want %v", got, DefaultProvisioningTimeout)
	}
	t.Setenv("PROVISION_TIMEOUT_SECONDS", "not-a-number")
	if got := provisioningTimeoutFor("claude-code"); got != DefaultProvisioningTimeout {
		t.Errorf("bad override (claude-code): got %v, want default %v", got, DefaultProvisioningTimeout)
	}
}

// TestProvisioningTimeout_RuntimeAware verifies hermes gets the longer
// HermesProvisioningTimeout while other runtimes keep the default.
// Mirrors bootstrap_watcher.go's bootstrapTimeoutFn — these two
// timeouts must stay in sync (sweep > watcher) or healthy hermes
// boots get killed mid-install.
func TestProvisioningTimeout_RuntimeAware(t *testing.T) {
	cases := []struct {
		runtime string
		want    time.Duration
	}{
		{"hermes", HermesProvisioningTimeout},
		{"langgraph", DefaultProvisioningTimeout},
		{"claude-code", DefaultProvisioningTimeout},
		{"crewai", DefaultProvisioningTimeout},
		{"autogen", DefaultProvisioningTimeout},
		{"", DefaultProvisioningTimeout},
		{"unknown-runtime", DefaultProvisioningTimeout},
	}
	for _, c := range cases {
		if got := provisioningTimeoutFor(c.runtime); got != c.want {
			t.Errorf("runtime=%q: got %v, want %v", c.runtime, got, c.want)
		}
	}
}