package wcore

import (
	"context"
	"fmt"
	"time"

	"github.com/wavetermdev/waveterm/pkg/blockcontroller"
	"github.com/wavetermdev/waveterm/pkg/panichandler"
	"github.com/wavetermdev/waveterm/pkg/telemetry"
	"github.com/wavetermdev/waveterm/pkg/waveobj"
	"github.com/wavetermdev/waveterm/pkg/wps"
	"github.com/wavetermdev/waveterm/pkg/wshrpc"
	"github.com/wavetermdev/waveterm/pkg/wstore"
)

func CreateSubBlock(ctx context.Context, blockId string, blockDef *waveobj.BlockDef) (*waveobj.Block, error) {
	if blockDef == nil {
		return nil, fmt.Errorf("blockDef is nil")
	}
	if blockDef.Meta == nil || blockDef.Meta.GetString(waveobj.MetaKey_View, "") == "" {
		return nil, fmt.Errorf("no view provided for new block")
	}
	blockData, err := wstore.CreateSubBlock(ctx, blockId, blockDef)
	if err != nil {
		return nil, fmt.Errorf("error creating sub block: %w", err)
	}
	return blockData, nil
}

func CreateBlock(ctx context.Context, tabId string, blockDef *waveobj.BlockDef, rtOpts *waveobj.RuntimeOpts) (*waveobj.Block, error) {
	if blockDef == nil {
		return nil, fmt.Errorf("blockDef is nil")
	}
	if blockDef.Meta == nil || blockDef.Meta.GetString(waveobj.MetaKey_View, "") == "" {
		return nil, fmt.Errorf("no view provided for new block")
	}
	blockData, err := wstore.CreateBlock(ctx, tabId, blockDef, rtOpts)
	if err != nil {
		return nil, fmt.Errorf("error creating block: %w", err)
	}
	go func() {
		defer panichandler.PanicHandler("CreateBlock:telemetry")
		blockView := blockDef.Meta.GetString(waveobj.MetaKey_View, "")
		if blockView == "" {
			return
		}
		tctx, cancelFn := context.WithTimeout(context.Background(), 2*time.Second)
		defer cancelFn()
		telemetry.UpdateActivity(tctx, wshrpc.ActivityUpdate{
			Renderers: map[string]int{blockView: 1},
		})
	}()
	return blockData, nil
}

func DeleteBlock(ctx context.Context, blockId string) error {
	block, err := wstore.DBMustGet[*waveobj.Block](ctx, blockId)
	if err != nil {
		return fmt.Errorf("error getting block: %w", err)
	}
	if block == nil {
		return nil
	}
	if len(block.SubBlockIds) > 0 {
		for _, subBlockId := range block.SubBlockIds {
			err := DeleteBlock(ctx, subBlockId)
			if err != nil {
				return fmt.Errorf("error deleting subblock %s: %w", subBlockId, err)
			}
		}
	}
	err = wstore.DeleteBlock(ctx, blockId)
	if err != nil {
		return fmt.Errorf("error deleting block: %w", err)
	}
	go blockcontroller.StopBlockController(blockId)
	sendBlockCloseEvent(blockId)
	return nil
}

func sendBlockCloseEvent(blockId string) {
	waveEvent := wps.WaveEvent{
		Event: wps.Event_BlockClose,
		Scopes: []string{
			waveobj.MakeORef(waveobj.OType_Block, blockId).String(),
		},
		Data: blockId,
	}
	wps.Broker.Publish(waveEvent)
}