package main

import (
	"fmt"
	"os"
	"strings"
	"unsafe"

	_ "github.com/ying32/govcl/pkgs/winappres" // Extra _syso files for Windows
	"github.com/ying32/govcl/vcl"
	"github.com/ying32/govcl/vcl/types"
)

const (
	MY_SPACING = 6
	MY_WIDTH   = 180
)

type TMainForm struct {
	*vcl.TForm

	ImageList     *vcl.TImageList
	Menu          *vcl.TMainMenu
	Buckets       *vcl.TTreeView
	Tabs          *vcl.TPageControl
	propertiesBox *vcl.TMemo
	contentBox    *vcl.TListView

	dbs []loadedDatabase
}

var (
	mainForm *TMainForm
)

func main() {
	vcl.RunApp(&mainForm)
}

func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
	f.ImageList = loadImages(f)

	f.SetCaption("yvbolt")
	f.ImageList.GetIcon(imgDatabaseLightning, f.Icon())

	mnuFile := vcl.NewMenuItem(f)
	mnuFile.SetCaption("File")

	mnuFileOpen := vcl.NewMenuItem(mnuFile)
	mnuFileOpen.SetCaption("Open Bolt database...")
	mnuFileOpen.SetImageIndex(imgDatabaseAdd)
	mnuFileOpen.SetShortCutFromString("Ctrl+O")
	mnuFileOpen.SetOnClick(f.OnMnuFileOpenClick)
	mnuFile.Add(mnuFileOpen)

	mnuFileSqliteOpen := vcl.NewMenuItem(mnuFile)
	mnuFileSqliteOpen.SetCaption("Open SQLite database...")
	mnuFileSqliteOpen.SetImageIndex(imgDatabaseAdd)
	mnuFileSqliteOpen.SetOnClick(f.OnMnuFileSqliteOpenClick)
	mnuFile.Add(mnuFileSqliteOpen)

	mnuFileSqliteMemory := vcl.NewMenuItem(mnuFile)
	mnuFileSqliteMemory.SetCaption("New SQLite in-memory database")
	mnuFileSqliteMemory.SetImageIndex(imgDatabaseAdd)
	mnuFileSqliteMemory.SetOnClick(f.OnMnuFileSqliteMemoryClick)
	mnuFile.Add(mnuFileSqliteMemory)

	mnuSep := vcl.NewMenuItem(mnuFile)
	mnuSep.SetCaption("-") // Creates separator
	mnuFile.Add(mnuSep)

	mnuFileExit := vcl.NewMenuItem(mnuFile)
	mnuFileExit.SetCaption("Exit")
	mnuFileExit.SetOnClick(f.OnMnuFileExitClick)
	mnuFile.Add(mnuFileExit)

	f.Menu = vcl.NewMainMenu(f)
	f.Menu.SetImages(f.ImageList)
	f.Menu.Items().Add(mnuFile)

	f.Buckets = vcl.NewTreeView(f)
	f.Buckets.SetParent(f)
	f.Buckets.SetImages(f.ImageList)
	f.Buckets.SetAlign(types.AlLeft)
	f.Buckets.SetWidth(MY_WIDTH)
	f.Buckets.SetReadOnly(true) // prevent click to rename on nodes
	f.Buckets.SetOnExpanding(f.OnNavExpanding)
	f.Buckets.SetOnChange(f.OnNavChange)

	hsplit := vcl.NewSplitter(f)
	hsplit.SetParent(f)
	hsplit.SetAlign(types.AlLeft)
	hsplit.SetLeft(1) // Just needs to be further "over" than f.Buckets for auto-alignment

	f.Tabs = vcl.NewPageControl(f)
	f.Tabs.SetParent(f)
	f.Tabs.SetAlign(types.AlClient)

	propertiesTab := vcl.NewTabSheet(f.Tabs)
	propertiesTab.SetParent(f.Tabs)
	propertiesTab.SetCaption("Properties")

	f.propertiesBox = vcl.NewMemo(propertiesTab)
	f.propertiesBox.SetParent(propertiesTab)
	f.propertiesBox.BorderSpacing().SetAround(MY_SPACING)
	f.propertiesBox.SetAlign(types.AlClient) // fill remaining space
	f.propertiesBox.SetReadOnly(true)
	f.propertiesBox.SetEnabled(false)
	f.propertiesBox.SetBorderStyle(types.BsNone)
	f.propertiesBox.SetText("Open a database to get started...")

	dataTab := vcl.NewTabSheet(f.Tabs)
	dataTab.SetParent(f.Tabs)
	dataTab.SetCaption("Data")

	f.contentBox = vcl.NewListView(dataTab)
	f.contentBox.SetParent(dataTab)
	f.contentBox.BorderSpacing().SetAround(MY_SPACING)
	f.contentBox.SetAlign(types.AlClient)     // fill remaining space
	f.contentBox.SetViewStyle(types.VsReport) // "Report style" i.e. has columns
	f.contentBox.SetAutoWidthLastColumn(true)
	f.contentBox.SetReadOnly(true)
	f.contentBox.Columns().Clear()
}

func (f *TMainForm) OnMnuFileOpenClick(sender vcl.IObject) {
	dlg := vcl.NewOpenDialog(f)
	dlg.SetTitle("Select a database file...")
	dlg.SetFilter("Bolt database|*.db|All files|*.*")
	ret := dlg.Execute() // Fake blocking
	if ret {
		f.boltAddDatabaseFromFile(dlg.FileName())
	}
}

func (f *TMainForm) OnMnuFileSqliteOpenClick(sender vcl.IObject) {
	dlg := vcl.NewOpenDialog(f)
	dlg.SetTitle("Select a database file...")
	dlg.SetFilter("SQLite database|*.db;*.db3;*.sqlite;*.sqlite3|All files|*.*")
	ret := dlg.Execute() // Fake blocking
	if ret {
		f.sqliteAddDatabaseFromFile(dlg.FileName())
	}
}

func (f *TMainForm) OnMnuFileSqliteMemoryClick(sender vcl.IObject) {
	f.sqliteAddDatabaseFromFile(`:memory:`)
}

func (f *TMainForm) OnMnuFileExitClick(sender vcl.IObject) {
	os.Exit(0)
}

func (f *TMainForm) OnNavChange(sender vcl.IObject, node *vcl.TTreeNode) {

	if node.Data() == nil {
		vcl.ShowMessage("unexpected nil data")
		return
	}

	ndata := (*navData)(node.Data())
	ndata.ld.RenderForNav(f, ndata) // Handover to the database type's own renderer function
}

func (f *TMainForm) OnNavExpanding(sender vcl.IObject, node *vcl.TTreeNode, allowExpansion *bool) {

	if node.Data() == nil {
		vcl.ShowMessage("unexpected nil data")
		*allowExpansion = false
		return
	}

	ndata := (*navData)(node.Data())

	if ndata.childrenLoaded {
		return
	}

	// Find the child buckets from this point under the element
	nextBucketNames, err := ndata.ld.NavChildren(ndata)
	if err != nil {
		vcl.ShowMessage(fmt.Sprintf("Failed to find child buckets under %q: %s", strings.Join(ndata.bucketPath, `/`), err.Error()))
		*allowExpansion = false
		return
	}

	ndata.childrenLoaded = true // don't repeat this work

	if len(nextBucketNames) == 0 {
		node.SetHasChildren(false)
		*allowExpansion = false

	} else {

		// Populate LCL child nodes
		for _, bucketName := range nextBucketNames {

			node := f.Buckets.Items().AddChild(node, formatUtf8([]byte(bucketName)))
			node.SetHasChildren(true) // dynamically populate in OnNavExpanding
			navData := &navData{
				ld:             ndata.ld,
				childrenLoaded: false,      // will be loaded dynamically
				bucketPath:     []string{}, // empty = root
			}
			navData.bucketPath = append(navData.bucketPath, ndata.bucketPath...)
			navData.bucketPath = append(navData.bucketPath, bucketName)
			node.SetData(unsafe.Pointer(navData))

			ndata.ld.Keepalive(navData)
		}

		*allowExpansion = true
	}
}