package repository

import (
	"context"
	"testing"
	"time"

	"backupx/server/internal/model"
	"github.com/glebarez/sqlite"
	"gorm.io/gorm"
	gormlogger "gorm.io/gorm/logger"
)

func newTestDB(t *testing.T) *gorm.DB {
	t.Helper()
	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{Logger: gormlogger.Default.LogMode(gormlogger.Silent)})
	if err != nil {
		t.Fatalf("open: %v", err)
	}
	if err := db.AutoMigrate(&model.AgentCommand{}); err != nil {
		t.Fatalf("migrate: %v", err)
	}
	return db
}

func TestAgentCommandRepository_ClaimPending(t *testing.T) {
	db := newTestDB(t)
	repo := NewAgentCommandRepository(db)
	ctx := context.Background()

	// 插入两条 pending 命令
	c1 := &model.AgentCommand{NodeID: 5, Type: "run_task", Status: model.AgentCommandStatusPending, Payload: `{"taskId":1}`}
	c2 := &model.AgentCommand{NodeID: 5, Type: "list_dir", Status: model.AgentCommandStatusPending, Payload: `{"path":"/"}`}
	c3 := &model.AgentCommand{NodeID: 99, Type: "run_task", Status: model.AgentCommandStatusPending}
	for _, c := range []*model.AgentCommand{c1, c2, c3} {
		if err := repo.Create(ctx, c); err != nil {
			t.Fatal(err)
		}
	}

	// 第一次 Claim 应拿到 c1
	claimed, err := repo.ClaimPending(ctx, 5)
	if err != nil {
		t.Fatalf("claim: %v", err)
	}
	if claimed == nil || claimed.ID != c1.ID || claimed.Status != model.AgentCommandStatusDispatched {
		t.Fatalf("expected c1 dispatched: %+v", claimed)
	}

	// 第二次应拿到 c2
	claimed2, err := repo.ClaimPending(ctx, 5)
	if err != nil || claimed2 == nil || claimed2.ID != c2.ID {
		t.Fatalf("expected c2: %+v %v", claimed2, err)
	}

	// 第三次无 pending，返回 nil
	claimed3, err := repo.ClaimPending(ctx, 5)
	if err != nil || claimed3 != nil {
		t.Fatalf("expected nil, got %+v", claimed3)
	}

	// 不同 node 的命令不应被抢到
	other, err := repo.ClaimPending(ctx, 5)
	if err != nil || other != nil {
		t.Fatalf("expected nil: %+v", other)
	}
}

func TestAgentCommandRepository_Update(t *testing.T) {
	db := newTestDB(t)
	repo := NewAgentCommandRepository(db)
	ctx := context.Background()
	cmd := &model.AgentCommand{NodeID: 1, Type: "run_task", Status: model.AgentCommandStatusPending}
	_ = repo.Create(ctx, cmd)

	cmd.Status = model.AgentCommandStatusSucceeded
	cmd.Result = `{"ok":true}`
	now := time.Now().UTC()
	cmd.CompletedAt = &now
	if err := repo.Update(ctx, cmd); err != nil {
		t.Fatal(err)
	}

	got, err := repo.FindByID(ctx, cmd.ID)
	if err != nil || got == nil {
		t.Fatal(err)
	}
	if got.Status != model.AgentCommandStatusSucceeded || got.Result != `{"ok":true}` {
		t.Errorf("mismatch: %+v", got)
	}
}

func TestAgentCommandRepository_CompleteDispatchedOnlyUpdatesDispatchedCommand(t *testing.T) {
	db := newTestDB(t)
	repo := NewAgentCommandRepository(db)
	ctx := context.Background()
	dispatched := &model.AgentCommand{NodeID: 1, Type: "run_task", Status: model.AgentCommandStatusDispatched}
	timeout := &model.AgentCommand{NodeID: 1, Type: "run_task", Status: model.AgentCommandStatusTimeout, ErrorMessage: "timeout"}
	if err := repo.Create(ctx, dispatched); err != nil {
		t.Fatalf("Create dispatched returned error: %v", err)
	}
	if err := repo.Create(ctx, timeout); err != nil {
		t.Fatalf("Create timeout returned error: %v", err)
	}

	now := time.Now().UTC()
	dispatched.Status = model.AgentCommandStatusSucceeded
	dispatched.Result = `{"ok":true}`
	dispatched.CompletedAt = &now
	updated, err := repo.CompleteDispatched(ctx, dispatched)
	if err != nil {
		t.Fatalf("CompleteDispatched returned error: %v", err)
	}
	if !updated {
		t.Fatal("expected dispatched command to be updated")
	}

	timeout.Status = model.AgentCommandStatusSucceeded
	timeout.Result = `{"late":true}`
	timeout.CompletedAt = &now
	updated, err = repo.CompleteDispatched(ctx, timeout)
	if err != nil {
		t.Fatalf("CompleteDispatched terminal returned error: %v", err)
	}
	if updated {
		t.Fatal("expected terminal command not to be updated")
	}
	gotTimeout, err := repo.FindByID(ctx, timeout.ID)
	if err != nil {
		t.Fatalf("FindByID timeout returned error: %v", err)
	}
	if gotTimeout.Status != model.AgentCommandStatusTimeout || gotTimeout.Result != "" {
		t.Fatalf("expected timeout command unchanged, got %#v", gotTimeout)
	}
}

func TestAgentCommandRepository_TimeoutActiveDoesNotOverwriteTerminalCommand(t *testing.T) {
	db := newTestDB(t)
	repo := NewAgentCommandRepository(db)
	ctx := context.Background()
	succeeded := &model.AgentCommand{NodeID: 1, Type: "run_task", Status: model.AgentCommandStatusSucceeded, Result: `{"ok":true}`}
	if err := repo.Create(ctx, succeeded); err != nil {
		t.Fatalf("Create succeeded returned error: %v", err)
	}

	now := time.Now().UTC()
	succeeded.ErrorMessage = "timeout"
	succeeded.CompletedAt = &now
	updated, err := repo.TimeoutActive(ctx, succeeded)
	if err != nil {
		t.Fatalf("TimeoutActive returned error: %v", err)
	}
	if updated {
		t.Fatal("expected terminal command not to be timed out")
	}
	got, err := repo.FindByID(ctx, succeeded.ID)
	if err != nil {
		t.Fatalf("FindByID returned error: %v", err)
	}
	if got.Status != model.AgentCommandStatusSucceeded || got.ErrorMessage != "" || got.Result != `{"ok":true}` {
		t.Fatalf("expected succeeded command unchanged, got %#v", got)
	}
}

func TestAgentCommandRepository_MarkStaleTimeout(t *testing.T) {
	db := newTestDB(t)
	repo := NewAgentCommandRepository(db)
	ctx := context.Background()
	old := time.Now().Add(-time.Hour)
	recent := time.Now()
	// 两条 dispatched：一条旧、一条新
	oldCmd := &model.AgentCommand{NodeID: 1, Type: "run_task", Status: model.AgentCommandStatusDispatched, DispatchedAt: &old}
	newCmd := &model.AgentCommand{NodeID: 1, Type: "run_task", Status: model.AgentCommandStatusDispatched, DispatchedAt: &recent}
	_ = repo.Create(ctx, oldCmd)
	_ = repo.Create(ctx, newCmd)

	n, err := repo.MarkStaleTimeout(ctx, time.Now().Add(-30*time.Minute))
	if err != nil {
		t.Fatal(err)
	}
	if n != 1 {
		t.Errorf("expected 1 row, got %d", n)
	}
	oldGot, _ := repo.FindByID(ctx, oldCmd.ID)
	newGot, _ := repo.FindByID(ctx, newCmd.ID)
	if oldGot.Status != model.AgentCommandStatusTimeout {
		t.Errorf("old should be timeout: %+v", oldGot)
	}
	if newGot.Status != model.AgentCommandStatusDispatched {
		t.Errorf("new should stay dispatched: %+v", newGot)
	}
}

func TestAgentCommandRepository_ListStaleActiveIncludesPendingAndDispatched(t *testing.T) {
	db := newTestDB(t)
	repo := NewAgentCommandRepository(db)
	ctx := context.Background()
	old := time.Now().Add(-time.Hour)
	recent := time.Now()
	oldPending := &model.AgentCommand{NodeID: 1, Type: "run_task", Status: model.AgentCommandStatusPending, CreatedAt: old}
	oldDispatched := &model.AgentCommand{NodeID: 1, Type: "restore_record", Status: model.AgentCommandStatusDispatched, DispatchedAt: &old}
	recentPending := &model.AgentCommand{NodeID: 1, Type: "run_task", Status: model.AgentCommandStatusPending, CreatedAt: recent}
	succeeded := &model.AgentCommand{NodeID: 1, Type: "run_task", Status: model.AgentCommandStatusSucceeded, CreatedAt: old}
	for _, cmd := range []*model.AgentCommand{oldPending, oldDispatched, recentPending, succeeded} {
		if err := repo.Create(ctx, cmd); err != nil {
			t.Fatalf("Create returned error: %v", err)
		}
	}

	items, err := repo.ListStaleActive(ctx, time.Now().Add(-30*time.Minute))
	if err != nil {
		t.Fatalf("ListStaleActive returned error: %v", err)
	}
	if len(items) != 2 {
		t.Fatalf("expected 2 stale active commands, got %#v", items)
	}
	if items[0].ID != oldPending.ID || items[1].ID != oldDispatched.ID {
		t.Fatalf("unexpected stale active order/items: %#v", items)
	}
}

func TestAgentCommandRepository_NodeQueueSummaries(t *testing.T) {
	db := newTestDB(t)
	repo := NewAgentCommandRepository(db)
	ctx := context.Background()
	old := time.Now().UTC().Add(-20 * time.Minute)
	recent := time.Now().UTC().Add(-2 * time.Minute)
	dispatchedAt := time.Now().UTC().Add(-5 * time.Minute)
	completedAt := time.Now().UTC().Add(-1 * time.Minute)
	commands := []*model.AgentCommand{
		{NodeID: 1, Type: model.AgentCommandTypeRunTask, Status: model.AgentCommandStatusPending, CreatedAt: old},
		{NodeID: 1, Type: model.AgentCommandTypeRestoreRecord, Status: model.AgentCommandStatusPending, CreatedAt: recent},
		{NodeID: 1, Type: model.AgentCommandTypeRunTask, Status: model.AgentCommandStatusDispatched, DispatchedAt: &dispatchedAt},
		{NodeID: 1, Type: model.AgentCommandTypeRunTask, Status: model.AgentCommandStatusFailed, ErrorMessage: "boom", CompletedAt: &completedAt},
		{NodeID: 1, Type: model.AgentCommandTypeRunTask, Status: model.AgentCommandStatusTimeout, ErrorMessage: "late", CompletedAt: &recent},
		{NodeID: 2, Type: model.AgentCommandTypeRunTask, Status: model.AgentCommandStatusPending, CreatedAt: old},
	}
	for _, cmd := range commands {
		if err := repo.Create(ctx, cmd); err != nil {
			t.Fatalf("Create returned error: %v", err)
		}
	}

	summaries, err := repo.NodeQueueSummaries(ctx)
	if err != nil {
		t.Fatalf("NodeQueueSummaries returned error: %v", err)
	}
	nodeOne := summaries[1]
	if nodeOne.Pending != 2 || nodeOne.Dispatched != 1 || nodeOne.Running != 1 || nodeOne.Depth != 3 {
		t.Fatalf("unexpected node 1 summary: %#v", nodeOne)
	}
	if nodeOne.Timeouts != 1 || nodeOne.LastError != "boom" {
		t.Fatalf("expected terminal timeout and latest error in summary, got %#v", nodeOne)
	}
	if nodeOne.OldestActiveAt == nil || !nodeOne.OldestActiveAt.Equal(old) {
		t.Fatalf("expected oldest active at %s, got %#v", old, nodeOne.OldestActiveAt)
	}
	if nodeTwo := summaries[2]; nodeTwo.Pending != 1 || nodeTwo.Depth != 1 || nodeTwo.Timeouts != 0 || nodeTwo.LastError != "" {
		t.Fatalf("unexpected node 2 summary: %#v", nodeTwo)
	}
}