package app

import (
	"context"
	"fmt"

	"github.com/wailsapp/wails/v2/pkg/runtime"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
)

type OpenCollectionResult struct {
	Stats      bson.M `json:"stats"`
	StatsError string `json:"statsError"`
}

func (a *App) OpenCollection(hostKey, dbKey, collKey string) (result OpenCollectionResult) {
	client, ctx, close, err := a.connectToHost(hostKey)
	if err != nil {
		return
	}
	defer close()

	command := bson.M{"collStats": collKey}
	err = client.Database(dbKey).RunCommand(ctx, command).Decode(&result.Stats)
	if err != nil {
		runtime.LogWarningf(a.ctx, "Could not retrieve collection stats for %s: %s", collKey, err.Error())
		result.StatsError = err.Error()
	}

	return
}

func (a *App) RenameCollection(hostKey, dbKey, collKey, newCollKey string) bool {
	client, ctx, close, err := a.connectToHost(hostKey)
	if err != nil {
		return false
	}
	defer close()

	var result bson.M
	command := bson.D{
		bson.E{Key: "renameCollection", Value: fmt.Sprintf("%v.%v", dbKey, collKey)},
		bson.E{Key: "to", Value: fmt.Sprintf("%v.%v", dbKey, newCollKey)},
	}
	err = client.Database("admin").RunCommand(ctx, command).Decode(&result)
	if err != nil {
		runtime.LogWarningf(a.ctx, "Could not rename collection %s: %s", collKey, err.Error())
		runtime.MessageDialog(a.ctx, runtime.MessageDialogOptions{
			Title:   "Error renaming collection",
			Message: err.Error(),
			Type:    runtime.ErrorDialog,
		})
		return false
	}

	return true
}

func (a *App) DuplicateCollection(origHostKey, origDbKey, origCollKey, destHostKey, destDbKey, destCollKey string) bool {
	runtime.LogDebugf(a.ctx, "Duplicating collection %s:%s.%s to %s:%s.%s", origHostKey, origDbKey, origCollKey, destHostKey, destDbKey, destCollKey)

	if (origHostKey == destHostKey) && (origDbKey == destDbKey) && (origCollKey == destCollKey) {
		runtime.LogInfof(a.ctx, "Duplicating collection: cannot duplicate to the same collection")
		runtime.MessageDialog(a.ctx, runtime.MessageDialogOptions{
			Type:    runtime.WarningDialog,
			Title:   "Error while duplicating collection",
			Message: "The new collection name cannot equal the old one!",
		})
		return false
	}

	origHost, origCtx, origClose, err := a.connectToHost(origHostKey)
	if err != nil {
		return false
	}
	defer origClose()

	var destHost *mongo.Client
	var destCtx context.Context

	if origHostKey != destHostKey {
		var destClose func()
		destHost, destCtx, destClose, err = a.connectToHost(destHostKey)

		if err != nil {
			return false
		}

		defer destClose()
	} else {
		destHost = origHost
		destCtx = origCtx
	}

	destColl := destHost.Database(destDbKey).Collection(destCollKey)
	origCur, err := origHost.Database(origDbKey).Collection(origCollKey).Find(origCtx, bson.D{})

	if err != nil {
		runtime.LogInfof(a.ctx, "Duplicating collection: could not create origin cursor: %s", err.Error())
		runtime.MessageDialog(a.ctx, runtime.MessageDialogOptions{
			Type:    runtime.WarningDialog,
			Title:   "Error while duplicating collection",
			Message: "Could not create origin cursor: " + err.Error(),
		})
		return false
	}

	var n int64 = 0
	var ok = true

	for origCur.Next(origCtx) {
		_, err := destColl.InsertOne(destCtx, origCur.Current)

		if err != nil {
			ok = false
			runtime.LogInfof(a.ctx, "Duplicating collection: could not insert item %d: %s", n, err.Error())
			runtime.MessageDialog(a.ctx, runtime.MessageDialogOptions{
				Type:    runtime.WarningDialog,
				Title:   "Error while duplicating collection",
				Message: fmt.Sprintf("Could not insert item %d: %s", n, err.Error()),
			})
		}

		n += 1
	}

	return ok
}

func (a *App) TruncateCollection(hostKey, dbKey, collKey string) bool {
	choice, _ := runtime.MessageDialog(a.ctx, runtime.MessageDialogOptions{
		Title:         "Confirm",
		Message:       "Are you sure you want to remove all items in " + collKey + "?",
		Buttons:       []string{"Yes", "Cancel"},
		DefaultButton: "Yes",
		CancelButton:  "Cancel",
	})
	if choice != "Yes" {
		return false
	}

	client, ctx, close, err := a.connectToHost(hostKey)
	if err != nil {
		return false
	}
	defer close()

	_, err = client.Database(dbKey).Collection(collKey).DeleteMany(ctx, bson.D{})
	if err != nil {
		runtime.LogWarningf(a.ctx, "Could not truncate collection %s: %s", collKey, err.Error())
		runtime.MessageDialog(a.ctx, runtime.MessageDialogOptions{
			Title:   "Error truncating collection",
			Message: err.Error(),
			Type:    runtime.ErrorDialog,
		})
		return false
	}

	return true
}

func (a *App) DropCollection(hostKey, dbKey, collKey string) bool {
	choice, _ := runtime.MessageDialog(a.ctx, runtime.MessageDialogOptions{
		Title:         "Confirm",
		Message:       "Are you sure you want to drop " + collKey + "?",
		Buttons:       []string{"Yes", "Cancel"},
		DefaultButton: "Yes",
		CancelButton:  "Cancel",
	})
	if choice != "Yes" {
		return false
	}

	client, ctx, close, err := a.connectToHost(hostKey)
	if err != nil {
		return false
	}
	defer close()

	err = client.Database(dbKey).Collection(collKey).Drop(ctx)
	if err != nil {
		runtime.LogWarningf(a.ctx, "Could not drop collection %s: %s", collKey, err.Error())
		runtime.MessageDialog(a.ctx, runtime.MessageDialogOptions{
			Title:   "Error dropping collection",
			Message: err.Error(),
			Type:    runtime.ErrorDialog,
		})
		return false
	}

	return true
}