package main

import (
	"fmt"
	"os"
	"path/filepath"
	"slices"
	"strings"
	"time"

	"github.com/BurntSushi/toml"

	"github.com/ying32/govcl/vcl"
	"github.com/ying32/govcl/vcl/types"
)

type TMainForm struct {
	*vcl.TForm

	MainMenu               *vcl.TMainMenu
	ChangePasswordMenuItem *vcl.TMenuItem
	AboutMenuItem          *vcl.TMenuItem

	PageControl *vcl.TPageControl

	TabSheet1            *vcl.TTabSheet
	GroupBox             *vcl.TGroupBox
	ConfigLabel          *vcl.TLabel
	ConfigComboBox       *vcl.TComboBox
	SqlFileLabel         *vcl.TLabel
	SqlFileComboBox      *vcl.TComboBox
	ExportFormatLabel    *vcl.TLabel
	ExportFormatComboBox *vcl.TComboBox
	CharsetLabel         *vcl.TLabel
	CharsetComboBox      *vcl.TComboBox
	ExportPathLabel      *vcl.TLabel
	ExportPathPicker     *vcl.TDirectoryEdit
	BottomPanel          *vcl.TPanel
	LaunchButton         *vcl.TBitBtn

	TabSheet2      *vcl.TTabSheet
	ServerListView *vcl.TListView
	c1             *vcl.TListColumn
	c2             *vcl.TListColumn

	StatusBar *vcl.TStatusBar
	p1        *vcl.TStatusPanel
	p2        *vcl.TStatusPanel
}

var mainForm *TMainForm

func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
	f.SetWidth(800)
	f.SetHeight(400)
	f.Constraints().SetMinHeight(400) // to prevent wrong ordering of widgets for small windows sizes
	f.SetPosition(types.PoDesktopCenter)
	f.SetCaption("OMQ")
	f.SetDoubleBuffered(true)

	f.MainMenu = vcl.NewMainMenu(f)
	f.ChangePasswordMenuItem = vcl.NewMenuItem(f)
	f.MainMenu.Items().Add(f.ChangePasswordMenuItem)
	f.ChangePasswordMenuItem.SetCaption("Изменить логин/пароль")
	f.ChangePasswordMenuItem.SetBitmap(getImageBitmap("img/change_password.png"))
	f.ChangePasswordMenuItem.SetOnClick(f.changePassword)
	f.AboutMenuItem = vcl.NewMenuItem(f)
	f.MainMenu.Items().Add(f.AboutMenuItem)
	f.AboutMenuItem.SetCaption("О программе")
	f.AboutMenuItem.SetBitmap(getImageBitmap("img/information.png"))
	f.AboutMenuItem.SetOnClick(func(sender vcl.IObject) {
		vcl.MessageDlg("Программа выгрузки результатов SQL-запросов с нескольких серверов баз данных Oracle.", types.MtInformation)
	})

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

	f.TabSheet1 = vcl.NewTabSheet(f.PageControl)
	f.TabSheet1.SetParent(f.PageControl)
	f.TabSheet1.SetTabVisible(false)

	f.GroupBox = vcl.NewGroupBox(f)
	f.GroupBox.SetParent(f.TabSheet1)
	f.GroupBox.SetAlign(types.AlClient)
	f.GroupBox.SetCaption("Параметры запроса")
	// TODO: добавить AutoSize

	f.ConfigLabel = vcl.NewLabel(f)
	f.ConfigLabel.SetParent(f.GroupBox)
	f.ConfigLabel.SetCaption("Настройки серверов")
	f.ConfigLabel.SetTop(0)
	f.ConfigLabel.BorderSpacing().SetTop(8)
	f.ConfigLabel.BorderSpacing().SetLeft(8)
	f.ConfigLabel.BorderSpacing().SetRight(8)
	f.ConfigLabel.SetAlign(types.AlTop)

	f.ConfigComboBox = vcl.NewComboBox(f)
	f.ConfigComboBox.SetParent(f.GroupBox)
	f.ConfigComboBox.SetAlign(types.AlTop)
	f.ConfigComboBox.BorderSpacing().SetTop(2)
	f.ConfigComboBox.BorderSpacing().SetLeft(8)
	f.ConfigComboBox.BorderSpacing().SetRight(8)
	f.ConfigComboBox.SetTop(100)
	f.ConfigComboBox.SetStyle(types.CsDropDownList)

	f.SqlFileLabel = vcl.NewLabel(f)
	f.SqlFileLabel.SetParent(f.GroupBox)
	f.SqlFileLabel.SetCaption("SQL-скрипт")
	f.SqlFileLabel.SetAlign(types.AlTop)
	f.SqlFileLabel.BorderSpacing().SetTop(8)
	f.SqlFileLabel.SetTop(200)
	f.SqlFileLabel.BorderSpacing().SetLeft(8)
	f.SqlFileLabel.BorderSpacing().SetRight(8)

	f.SqlFileComboBox = vcl.NewComboBox(f)
	f.SqlFileComboBox.SetParent(f.GroupBox)
	f.SqlFileComboBox.SetAlign(types.AlTop)
	f.SqlFileComboBox.BorderSpacing().SetTop(2)
	f.SqlFileComboBox.BorderSpacing().SetLeft(8)
	f.SqlFileComboBox.BorderSpacing().SetRight(8)
	f.SqlFileComboBox.SetTop(300)
	f.SqlFileComboBox.SetStyle(types.CsDropDownList)

	f.ExportFormatLabel = vcl.NewLabel(f)
	f.ExportFormatLabel.SetParent(f.GroupBox)
	f.ExportFormatLabel.SetCaption("Формат выгрузки")
	f.ExportFormatLabel.SetAlign(types.AlTop)
	f.ExportFormatLabel.SetTop(400)
	f.ExportFormatLabel.BorderSpacing().SetTop(8)
	f.ExportFormatLabel.BorderSpacing().SetLeft(8)
	f.ExportFormatLabel.BorderSpacing().SetRight(8)

	f.ExportFormatComboBox = vcl.NewComboBox(f)
	f.ExportFormatComboBox.SetParent(f.GroupBox)
	f.ExportFormatComboBox.SetAlign(types.AlTop)
	f.ExportFormatComboBox.BorderSpacing().SetTop(2)
	f.ExportFormatComboBox.BorderSpacing().SetLeft(8)
	f.ExportFormatComboBox.BorderSpacing().SetRight(8)
	f.ExportFormatComboBox.SetTop(500)
	f.ExportFormatComboBox.SetStyle(types.CsDropDownList)
	f.ExportFormatComboBox.SetOnChange(f.OnExportFormatComboBoxChange)

	f.CharsetLabel = vcl.NewLabel(f)
	f.CharsetLabel.SetParent(f.GroupBox)
	f.CharsetLabel.SetCaption("Кодировка CSV-файла")
	f.CharsetLabel.SetAlign(types.AlTop)
	f.CharsetLabel.SetTop(600)
	f.CharsetLabel.BorderSpacing().SetTop(8)
	f.CharsetLabel.BorderSpacing().SetLeft(8)
	f.CharsetLabel.BorderSpacing().SetRight(8)

	f.CharsetComboBox = vcl.NewComboBox(f)
	f.CharsetComboBox.SetParent(f.GroupBox)
	f.CharsetComboBox.SetAlign(types.AlTop)
	f.CharsetComboBox.BorderSpacing().SetTop(2)
	f.CharsetComboBox.BorderSpacing().SetLeft(8)
	f.CharsetComboBox.BorderSpacing().SetRight(8)
	f.CharsetComboBox.SetTop(700)
	f.CharsetComboBox.SetStyle(types.CsDropDownList)

	f.ExportPathLabel = vcl.NewLabel(f)
	f.ExportPathLabel.SetParent(f.GroupBox)
	f.ExportPathLabel.SetCaption("Путь сохранения результата")
	f.ExportPathLabel.SetAlign(types.AlTop)
	f.ExportPathLabel.SetTop(800)
	f.ExportPathLabel.BorderSpacing().SetTop(8)
	f.ExportPathLabel.BorderSpacing().SetLeft(8)
	f.ExportPathLabel.BorderSpacing().SetRight(8)

	f.ExportPathPicker = vcl.NewDirectoryEdit(f)
	f.ExportPathPicker.SetParent(f.GroupBox)
	f.ExportPathPicker.SetAlign(types.AlTop)
	f.ExportPathPicker.BorderSpacing().SetTop(2)
	f.ExportPathPicker.BorderSpacing().SetLeft(8)
	f.ExportPathPicker.BorderSpacing().SetRight(8)
	f.ExportPathPicker.SetTop(900)
	f.ExportPathPicker.SetFlat(true)

	f.BottomPanel = vcl.NewPanel(f)
	f.BottomPanel.SetParent(f.TabSheet1)
	f.BottomPanel.SetAlign(types.AlBottom)
	f.BottomPanel.SetHeight(48)
	f.BottomPanel.SetBevelOuter(types.BvNone)

	f.LaunchButton = vcl.NewBitBtn(f)
	f.LaunchButton.SetParent(f.BottomPanel)
	f.LaunchButton.SetCaption("Запуск")
	f.LaunchButton.SetAlign(types.AlRight)
	f.LaunchButton.SetWidth(96)
	f.LaunchButton.BorderSpacing().SetAround(8)
	f.LaunchButton.SetOnClick(f.OnLaunchButtonClick)
	f.LaunchButton.SetGlyph(getImageBitmap("img/bullet_go.png"))

	f.TabSheet2 = vcl.NewTabSheet(f.PageControl)
	f.TabSheet2.SetParent(f.PageControl)
	f.TabSheet2.SetTabVisible(false)

	f.ServerListView = vcl.NewListView(f)
	f.ServerListView.SetParent(f.TabSheet2)
	f.ServerListView.SetAlign(types.AlClient)
	f.ServerListView.SetViewStyle(types.VsReport)
	f.ServerListView.SetBorderStyle(types.BsNone)
	f.ServerListView.SetReadOnly(true)
	f.ServerListView.SetRowSelect(true)

	f.c1 = f.ServerListView.Columns().Add()
	f.c1.SetCaption("Сервер")
	f.c1.SetAutoSize(true)

	f.c2 = f.ServerListView.Columns().Add()
	f.c2.SetCaption("Статус")

	f.StatusBar = vcl.NewStatusBar(f)
	f.StatusBar.SetParent(f)
	f.StatusBar.SetSimplePanel(false)
	f.p1 = f.StatusBar.Panels().Add()
	f.p2 = f.StatusBar.Panels().Add()

	f.SetOnResize(f.OnFormResize)

	// Servers file list -------------------------------------------------------
	configs, _ := filepath.Glob(filepath.Join(CONFIG_FILES_DIR, fmt.Sprintf("*.%s", CONFIG_FILE_EXT)))
	for i := range configs {
		configs[i] = strings.TrimSuffix(filepath.Base(configs[i]), "."+CONFIG_FILE_EXT)
	}
	for _, v := range configs {
		f.ConfigComboBox.Items().Add(v)
	}
	if len(configs) > 0 {
		f.ConfigComboBox.SetItemIndex(0)
	}
	// -------------------------------------------------------------------------

	// SQL-files list ----------------------------------------------------------
	files, _ := filepath.Glob(filepath.Join(SQL_FILES_DIR, fmt.Sprintf("*.%s", SQL_FILE_EXT)))
	for i := range files {
		files[i] = strings.TrimSuffix(filepath.Base(files[i]), "."+SQL_FILE_EXT)
	}
	for _, v := range files {
		f.SqlFileComboBox.Items().Add(v)
	}
	if len(configs) > 0 {
		f.SqlFileComboBox.SetItemIndex(0)
	}
	// -------------------------------------------------------------------------

	// File formats ------------------------------------------------------------
	for _, v := range []string{string(ExportFormatExcel), string(ExportFormatCsv), string(ExportFormatCsvZip)} {
		f.ExportFormatComboBox.Items().Add(v)
	}
	f.ExportFormatComboBox.SetItemIndex(0)

	// Charsets ----------------------------------------------------------------
	for _, v := range []string{string(EncodingWin1251), string(EncodingUtf8)} {
		f.CharsetComboBox.Items().Add(v)
	}
	f.CharsetComboBox.SetItemIndex(0)
	f.OnExportFormatComboBoxChange(nil)
	// -------------------------------------------------------------------------
}

func (f *TMainForm) OnFormResize(sender vcl.IObject) {
	if f.Width() < 320 {
		f.StatusBar.Panels().Items(0).SetWidth(f.Width() / 2)
	} else {
		f.StatusBar.Panels().Items(0).SetWidth(f.Width() - 160)
	}

	f.ServerListView.Columns().Items(1).SetWidth(
		f.ServerListView.Width() - f.ServerListView.Columns().Items(0).Width())
}

func (f *TMainForm) OnLaunchButtonClick(sender vcl.IObject) {
	f.MainMenu.Free()

	job := &Job{
		configFilePath:   filepath.Join(CONFIG_FILES_DIR, f.ConfigComboBox.Text()) + "." + CONFIG_FILE_EXT,
		scriptFilePath:   filepath.Join(SQL_FILES_DIR, f.SqlFileComboBox.Text()) + "." + SQL_FILE_EXT,
		exportFileFormat: ExportFormat(f.ExportFormatComboBox.Text()),
		encoding:         Encoding(f.CharsetComboBox.Text()),
		exportPath:       f.ExportPathPicker.Directory()}

	err := job.init()
	if err != nil {
		vcl.MessageDlg(err.Error(), types.MtError)
		return
	}

	for _, server := range job.config.Servers {
		item := f.ServerListView.Items().Add()
		item.SetCaption(server.Name)

		item.SubItems().Add("")
	}

	f.PageControl.SetPageIndex(1)

	go func() {
		for !job.isFinished {
			f.UpdateStatus(job)

			time.Sleep(UI_UPDATE_PERIOD)
		}
	}()

	go func() {
		err = job.launch()
		f.UpdateStatus(job)
		if err != nil {
			vcl.ThreadSync(func() {
				vcl.MessageDlg(err.Error(), types.MtError)
				f.Close()
			})
		} else {
			vcl.ThreadSync(func() {
				vcl.MessageDlg("Завершено.", types.MtInformation)
				f.Close()
			})
		}
	}()
}

func (f *TMainForm) OnExportFormatComboBoxChange(sender vcl.IObject) {
	if slices.Contains([]string{string(ExportFormatCsv), string(ExportFormatCsvZip)}, f.ExportFormatComboBox.Text()) {
		f.CharsetComboBox.SetEnabled(true)
	} else {
		f.CharsetComboBox.SetEnabled(false)
	}
}

func (f *TMainForm) UpdateStatus(job *Job) {
	vcl.ThreadSync(func() {
		f.OnFormResize(nil)

		f.StatusBar.Panels().Items(0).SetText(job.status)
		f.StatusBar.Panels().Items(1).SetText(fmt.Sprintf("%d строк", job.exportedRows))

		for i, v := range job.config.Servers {
			s := []string{v.status}
			if v.err != nil {
				s = append(s, v.err.Error())
			}
			f.ServerListView.Items().Item(int32(i)).SubItems().SetText(strings.Join(s, ": "))
		}
	})
}

func (f *TMainForm) changePassword(sender vcl.IObject) {
	changePasswordForm := new(TConfigEditorForm)
	vcl.Application.CreateForm(&changePasswordForm)
	if changePasswordForm.ShowModal() != types.IdOK {
		return
	}

	newLogin := changePasswordForm.loginEdit.Text()
	newPassword := changePasswordForm.passwordEdit.Text()
	changePasswordForm.Free()

	configFilePath := filepath.Join(CONFIG_FILES_DIR, f.ConfigComboBox.Text()) + "." + CONFIG_FILE_EXT

	config, err := loadConfig(configFilePath)
	if err != nil {
		vcl.MessageDlg(err.Error(), types.MtError)
		return
	}

	for _, server := range config.Servers {
		server.Login = newLogin
		server.Password = newPassword
	}

	file, err := os.Create(configFilePath)
	if err != nil {
		vcl.MessageDlg(err.Error(), types.MtError)
		return
	}

	err = toml.NewEncoder(file).Encode(config)
	if err != nil {
		vcl.MessageDlg(err.Error(), types.MtError)
		file.Close()
		return
	}

	err = file.Close()
	if err != nil {
		vcl.MessageDlg(err.Error(), types.MtError)
		return
	}

	vcl.MessageDlg("Логин/пароль успешно изменены.", types.MtInformation)
}