/*
Copyright © Brian Buller <brian@bullercodeworks.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
package app

import (
	"fmt"
	"log/slog"
	"net/url"
	"slices"
	"strings"
	"time"

	"git.bullercodeworks.com/brian/expds/data"
	"git.bullercodeworks.com/brian/expds/data/models"
	wd "git.bullercodeworks.com/brian/expds/widgets"
	w "git.bullercodeworks.com/brian/tcell-widgets"
	"github.com/bluesky-social/indigo/atproto/syntax"
	"github.com/gdamore/tcell"
	"github.com/skratchdot/open-golang/open"
	"github.com/spf13/viper"
	"golang.design/x/clipboard"
)

type ScreenHome struct {
	a     *App
	r     *data.Repo
	w, h  int
	style tcell.Style

	alert *w.Alert

	menuLayout *w.TopMenuLayout

	openPdsEntry *w.Field

	layout  *w.LinearLayout
	columns *w.LinearLayout

	activePds   *models.Pds
	pdsListing  *wd.TreeBrowser
	jsonContent *wd.JsonContent
	status      *wd.StatusBar
	stPathBlock *wd.StatusBlock

	cli *w.Cli

	doOpen    bool
	isLoading bool
	loading   *w.Spinner

	cursor int
}

func (s *ScreenHome) Init(a *App) {
	s.a, s.r = a, a.repo
	s.r.SetLogFunc(s.Log)

	s.style = a.style

	s.alert = w.NewAlert("expds.alert", s.style)
	s.alert.SetOkPressed(func() bool {
		s.alert.SetVisible(false)
		return true
	})
	s.alert.SetCancelPressed(nil)

	s.openPdsEntry = w.NewField("home.openpds.field", s.style)
	s.openPdsEntry.SetLabel("ID")
	s.openPdsEntry.SetActive(true)
	s.openPdsEntry.SetPos(w.Coord{X: 3, Y: 1})
	s.openPdsEntry.SetSize(w.Coord{X: 20, Y: 1})
	s.doOpen = true

	s.isLoading = false
	s.loading = w.NewSpinner("home.loading", s.style)
	s.loading.SetVisible(true)
	s.loading.SetPos(w.Coord{X: 2, Y: 1})

	s.menuLayout = w.NewTopMenuLayout("home.toplayout", s.style)
	s.initMenu()

	s.cli = w.NewCli("home.cli", s.style)
	s.initCli()
	s.cli.SetVisible(false)

	s.layout = w.NewLinearLayout("home.layout", s.style)

	s.columns = w.NewLinearLayout("home.layout.columns", s.style)
	s.columns.SetOrientation(w.LinLayH)

	//s.pdsListing = w.NewSimpleListWithHelp("pdslisting", s.style)
	s.pdsListing = wd.NewTreeBrowser("pdslisting", s.style)
	s.pdsListing.SetBorder([]rune{'─', '┬', '│', '┴', '─', '└', '│', '┌', '├', '─', '┤', '┬', '│', '┴', '┼'})

	s.pdsListing.SetTitle(strings.Repeat(" ", 30))
	s.pdsListing.SetOnSelect(s.selectPdsListingEntry)
	s.pdsListing.SetOnChange(s.changePdsList)
	s.pdsListing.SetVimMode(viper.GetBool(data.KeyVimMode))
	s.pdsListing.SetLogger(s.Log)

	s.jsonContent = wd.NewJsonContent("jsoncontent", s.style)
	km := s.jsonContent.GetKeyMap()
	km.Add(
		w.NewKey(w.BuildEK(tcell.KeyEnter), func(ev *tcell.EventKey) bool {
			// Init returns an error if the package is not ready for use.
			err := clipboard.Init()
			if err != nil {
				s.Log("Error initializing clipboard: %s", err.Error())
				return true
			}
			clipboard.Write(clipboard.FmtText, []byte(s.jsonContent.GetSelectedValue()))
			return true
		}),
		w.NewKey(w.BuildEKr('O'), func(ev *tcell.EventKey) bool {
			url := fmt.Sprintf("https://%s/xrpc/com.atproto.sync.getBlob?did=did:plc:pqwuemo2ic5tqmpwrajb2phi&cid=%s", s.activePds.AtId.String(), s.jsonContent.GetSelectedValue())
			open.Run(url)
			return true
		}),
	)
	s.jsonContent.SetKeyMap(km)
	s.jsonContent.SetVimMode(viper.GetBool(data.KeyVimMode))
	s.jsonContent.SetBorder(
		[]rune{'─', '┐', '│', '┘', '─', '─', ' ', '─', '├', '─', '┤', '┬', '│', '┴', '┼'},
	)

	statusStyle := s.style.Background(tcell.ColorDarkSlateGray)
	s.status = wd.NewStatusBar("home.statusbar", statusStyle)
	s.status.SetPos(w.Coord{X: 0, Y: s.a.GetH() - 1})
	s.status.SetLogger(s.Log)
	s.stPathBlock = wd.NewStatusBlock("home.statusbar.block", statusStyle.Foreground(tcell.ColorDarkSlateGray).Background(tcell.ColorOrange))
	s.stPathBlock.SetType(wd.SBTypePath)
	s.stPathBlock.SetParts([]string{"No PDS Loaded"})
	s.status.Add(s.stPathBlock)

	s.columns.AddAll(s.pdsListing, s.jsonContent)

	s.layout.AddAll(s.columns)
	s.layout.SetLogger(s.Log)
	s.layout.SetWeight(s.columns, 4)
	s.menuLayout.SetWidget(s.layout)
	s.layout.SetLogger(s.Log)
	s.columns.SetLogger(s.Log)
}

func (s *ScreenHome) GetName() string { return "home" }
func (s *ScreenHome) HandleResize(ev *tcell.EventResize) {
	s.w, s.h = ev.Size()
	s.menuLayout.HandleResize(w.Coord{X: s.w, Y: s.h - 1}.ResizeEvent())
	s.alert.HandleResize(w.Coord{X: s.w / 2, Y: s.h / 2}.ResizeEvent())
	s.alert.SetPos(w.Coord{X: s.w / 4, Y: s.h / 4})

	s.status.SetPos(w.Coord{X: 0, Y: s.h - 1})
	s.status.HandleResize(w.Coord{X: s.w, Y: 1}.ResizeEvent())
}

func (s *ScreenHome) HandleKey(ev *tcell.EventKey) bool {
	if s.alert.Visible() {
		return s.alert.HandleKey(ev)
	}
	if ev.Key() == tcell.KeyF12 {
		s.toggleCli()
		return true
	}
	m := s.menuLayout.Menu()
	if ev.Key() == tcell.KeyEscape {
		return s.menuLayout.HandleKey(ev)
	} else if m.Active() {
		return s.menuLayout.HandleKey(ev)
	}

	if s.doOpen {
		if ev.Key() == tcell.KeyCtrlU {
			s.openPdsEntry.SetValue("")
			return true
		}

		if ev.Key() == tcell.KeyEnter {
			return s.cliGetPds("getpds", s.openPdsEntry.Value())
		}
		return s.openPdsEntry.HandleKey(ev)
	}
	switch ev.Key() {
	case tcell.KeyCtrlO:
		return s.menuOpenPds()
	case tcell.KeyCtrlD:
		return s.deleteCurrentRecord()
	case tcell.KeyCtrlR:
		return s.menuRefreshPds()
	}
	return s.menuLayout.HandleKey(ev)
}
func (s *ScreenHome) HandleTime(ev *tcell.EventTime) {
	s.menuLayout.HandleTime(ev)
	s.loading.HandleTime(ev)
	s.status.HandleTime(ev)
}
func (s *ScreenHome) Draw() {
	if s.alert.Visible() {
		s.a.DrawWidget(s.alert)
		return
	}
	if s.doOpen {
		s.menuLayout.SetStyle(s.style.Foreground(tcell.ColorGray))
	}
	s.menuLayout.SetStyle(s.style)
	m := s.menuLayout.Menu()
	s.a.DrawWidget(s.menuLayout)
	if s.doOpen && !m.Active() {
		x, y := s.pdsListing.GetX(), s.pdsListing.GetY()
		s.a.DrawText(x+2, y, strings.Repeat(" ", len(s.pdsListing.Title())), s.style)
		s.a.DrawWidget(s.openPdsEntry)
	}

	// These are outside of the menuLayout
	if s.isLoading {
		s.a.DrawWidget(s.loading)
	}
	s.a.DrawWidget(s.status)
}
func (s *ScreenHome) Exit() error { return nil }
func (s *ScreenHome) Log(t string, a ...any) {
	if strings.Contains(fmt.Sprintf(t, a...), "auth server request failed") {
		// This error happens even on successfully creating an oAuth request? Maybe it's just me
		return
	}
	s.cli.Log(t, a...)
	s.showCli()
}

func (s *ScreenHome) initMenu() {
	s.menuLayout.SetActive(true)
	wrk := "[ ]"
	if viper.GetBool(data.KeyVimMode) {
		wrk = "[X]"
	}
	vimText := fmt.Sprintf("%s Vim Mode", wrk)
	wrk = "[ ]"
	if viper.GetBool(data.KeyRecNmInfer) {
		wrk = "[X]"
	}
	inferRecNm := fmt.Sprintf("%s Infer Record Names", wrk)
	s.menuLayout.AddMenuItems(
		s.menuLayout.CreateMenuItem("file", "File", nil, 'f',
			s.menuLayout.CreateMenuItem("file.openpds", "Open PDS", s.menuOpenPds, 'o'),
			s.menuLayout.CreateMenuItem("file.reloadpds", "Reload PDS", s.menuRefreshPds, 'r'),
			s.menuLayout.CreateMenuItem("file.exit", "Exit", s.menuExit, 'x'),
		),
		s.menuLayout.CreateMenuItem("settings", "Settings", nil, 's',
			s.menuLayout.CreateMenuItem("settings.vimmode", vimText, s.menuVimMode, 'v'),
			s.menuLayout.CreateMenuItem("settings.inferrecnm", inferRecNm, s.menuInferRecNm, 'r'),
		),
	)
}

func (s *ScreenHome) update() {
	if s.doOpen {
		s.menuLayout.SetWidget(s.openPdsEntry)
	} else {
		s.menuLayout.SetWidget(s.layout)
	}
	s.pdsListing.SetVimMode(viper.GetBool(data.KeyVimMode))
	s.jsonContent.SetVimMode(viper.GetBool(data.KeyVimMode))
	vimMI := s.menuLayout.FindItem("settings.vimmode")
	wrk := "[ ]"
	if viper.GetBool(data.KeyVimMode) {
		wrk = "[X]"
	}
	vimMI.SetLabel(fmt.Sprintf("%s Vim Mode", wrk))
	recNmInf := s.menuLayout.FindItem("settings.inferrecnm")
	wrk = "[ ]"
	if viper.GetBool(data.KeyRecNmInfer) {
		wrk = "[X]"
	}
	recNmInf.SetLabel(fmt.Sprintf("%s Infer Record Names", wrk))

	miReload := s.menuLayout.FindItem("file.reloadpds")
	if s.activePds == nil {
		miReload.SetDisabled(true)
		miReload.SetStyle(s.style.Foreground(tcell.ColorGray))
	} else {
		miReload.SetDisabled(false)
		miReload.SetStyle(s.style.Foreground(tcell.ColorLime))
	}
}

func (s *ScreenHome) initCli() {
	s.cli.SetVisible(true)
	s.cli.AddCommand(w.NewCliCommand("getpds", s.cliGetPds))
	s.cli.AddCommand(w.NewCliCommand("authpds", s.cliAuthPds))
	s.cli.AddCommand(w.NewCliCommand("backuppds", s.cliBackupPds))
	s.cli.AddCommand(w.NewCliCommand("sendstatus", s.cliSendStatus))
}

func (s *ScreenHome) toggleCli() {
	if s.layout.Contains(s.cli) {
		s.layout.Delete(s.cli)
		s.layout.ActivateWidget(s.columns)
	} else {
		s.layout.Add(s.cli)
		s.cli.SetVisible(true)
		s.layout.ActivateWidget(s.cli)
	}
}
func (s *ScreenHome) hideCli() {
	s.cli.SetVisible(false)
	if s.layout.Contains(s.cli) {
		s.layout.Delete(s.cli)
	}
}
func (s *ScreenHome) showCli() {
	s.cli.SetVisible(true)
	if !s.layout.Contains(s.cli) {
		s.layout.Add(s.cli)
	}
}

func (s *ScreenHome) cliGetPds(args ...string) bool {
	if len(args) < 1 {
		s.Log("No id given.")
		s.Log("Usage: 'getpds <atproto id>'")
		s.isLoading = false
		return true
	}
	s.getPds(args[1])
	return true
}

func (s *ScreenHome) cliAuthPds(args ...string) bool {
	if s.activePds == nil {
		s.Log("No active PDS.")
		return true
	}
	s.isLoading = true
	go func() {
		defer func() { s.isLoading = false }()
		// Check if we already have authentication.
		if !s.r.Auth.HasAuth(s.activePds.Did) {
			atid := s.activePds.AtId.String()
			callbackRes := make(chan url.Values, 1)
			listenPort, err := s.r.Auth.ListenForCallback(callbackRes)
			if err != nil {
				s.Log("Error Instantiating HTTP Server for Callback: %w", err)
				return
			}
			s.Log("Listening on %d", listenPort)
			_, err = s.r.Auth.StartAuthFlow(listenPort, atid, callbackRes)
			if err != nil {
				s.Log("Error starting auth flow: %w", err)
			} else {
				s.alert.SetTitle("Authentication Started")
				s.alert.SetMessage(fmt.Sprintf("OAuth Process Started.\nIf a browser window didn't open, you can open this URL manually:\nhttp://localhost:%d/auth\nThis url will redirect to the PDS OAuth Page.", listenPort))
				s.alert.SetVisible(true)
				s.alert.SetActive(true)
				go func() {
					for s.isLoading {
						time.Sleep(100)
					}
					s.alert.SetVisible(false)
				}()
			}
		}
	}()
	return true
}

func (s *ScreenHome) cliBackupPds(args ...string) bool {
	if s.activePds == nil {
		s.Log("No active PDS.")
		return true
	}
	s.isLoading = true
	go func() {
		defer func() { s.isLoading = false }()
		nm, sz, err := s.activePds.Backup()
		if err != nil {
			s.Log("Error: %w", err)
			return
		}
		s.Log("Backup Created: %s (%d bytes)", nm, sz)
	}()
	return true
}

func (s *ScreenHome) cliSendStatus(args ...string) bool {
	if s.activePds == nil {
		s.Log("No active PDS.")
		return true
	}
	s.isLoading = true
	go func() {
		defer func() { s.isLoading = false }()
		if !s.r.Auth.HasAuth(s.activePds.Did) {
			s.Log("Not authorized. Run `authpds`")
			return
		}
		err := s.r.SendToPDS(s.activePds.Did)
		if err != nil {
			s.Log("Error sending status: %w", err)
		}
	}()
	return true
}

func (s *ScreenHome) updatePdsListing() {
	s.pdsListing.SetTitle(fmt.Sprintf("─ %s (%s)", s.activePds.AtId.String(), s.activePds.Did.String()))
	s.pdsListing.Clear()
	nsidList := s.activePds.NSIDStringList()
	var tree []*wd.TreeNode
	for i, v := range nsidList {
		t := wd.NewTreeNode(v, v)
		nsid := s.activePds.NSIDs[i]
		rIds := s.activePds.GetRecordIdsFor(nsid)
		for j := range rIds {
			label := rIds[j]
			if viper.GetBool(data.KeyRecNmInfer) {
				if rec, ok := s.activePds.Records[rIds[j]]; ok {
					for k := range rec {
						if k == "name" || k == "title" || k == "label" || k == "displayName" {
							if f, ok := rec[k].(string); ok {
								label = fmt.Sprintf("%s (%s)", f, rIds[j])
								break
							}
						}
					}
				}
			}

			c := wd.NewTreeNode(label, rIds[j])
			t.AddChild(c)
		}
		tree = append(tree, t)
	}
	s.pdsListing.SetTree(tree)
	s.layout.ActivateWidget(s.columns)
	s.columns.ActivateWidget(s.pdsListing)
	s.pdsListing.SetActive(true)
	s.pdsListing.SetFocusable(true)
	s.hideCli()
}

func (s *ScreenHome) selectPdsListingEntry(tn *wd.TreeNode) bool {
	if !s.updateJsonView(tn) {
		return false
	}
	if tn.HasChildren() {
		tn.ToggleExpand()
		s.pdsListing.UpdateList()
	} else {
		s.columns.ActivateWidget(s.jsonContent)
	}

	return true
}

func (s *ScreenHome) changePdsList(tn *wd.TreeNode) bool {
	upd := s.updateJsonView(tn)
	upd = s.updateStatusPathBlock(tn)
	return upd
}
func (s *ScreenHome) updateStatusPathBlock(tn *wd.TreeNode) bool {
	s.stPathBlock.SetParts(tn.GetLabelPath())
	return true
}

func (s *ScreenHome) updateJsonView(tn *wd.TreeNode) bool {
	// TODO: Update JSON View
	if tn.Depth() == 0 {
		nsid, err := syntax.ParseNSID(tn.Value())
		if err != nil {
			s.Log("error parsing NSID from %s: %w", tn.Value(), err)
			return false
		}
		recordIds := s.activePds.GetRecordIdsFor(nsid)
		s.jsonContent.SetValue(recordIds)
		return true
	} else {
		s.jsonContent.SetValue(s.activePds.Records[tn.Value()])
	}
	return true
}

func (s *ScreenHome) menuOpenPds() bool {
	s.menuLayout.HideMenu()
	s.doOpen = true
	s.pdsListing.SetTitle(strings.Repeat(" ", 30))
	return true
}

func (s *ScreenHome) menuRefreshPds() bool {
	s.menuLayout.HideMenu()
	if s.activePds == nil {
		return false
	}

	// We want to persist 'opened' nodes
	var opened []string
	for _, n := range s.pdsListing.GetNodeList() {
		if n.IsExpanded() {
			opened = append(opened, n.Value())
			s.Log("Opened: %s", n.Value())
		}
	}
	s.getPds(s.activePds.AtId.String())
	for _, n := range s.pdsListing.GetNodeList() {
		s.Log("Testing: %s", n.Value())
		if slices.Contains(opened, n.Value()) {
			s.Log("-> Is Opened")
			n.Expand()
		}
	}
	return true
}

func (s *ScreenHome) menuExit() bool {
	s.a.Exit()
	return true
}

func (s *ScreenHome) menuVimMode() bool {
	s.menuLayout.HideMenu()
	viper.Set(data.KeyVimMode, !viper.GetBool(data.KeyVimMode))
	viper.WriteConfig()
	s.update()
	return true
}

func (s *ScreenHome) menuInferRecNm() bool {
	s.menuLayout.HideMenu()
	viper.Set(data.KeyRecNmInfer, !viper.GetBool(data.KeyRecNmInfer))
	viper.WriteConfig()
	s.update()
	return true
}

func (s *ScreenHome) getPds(atId string) {
	s.isLoading = true
	go func() {
		defer func() { s.isLoading = false }()
		var pds *models.Pds
		var err error
		if s.activePds != nil && string(s.activePds.AtId) == atId {
			pds, err = s.r.ReloadPds(atId)
		} else {
			pds, err = s.r.GetPDS(atId)
		}
		if err != nil {
			s.Log(err.Error())
			return
		} else if pds == nil {
			s.Log("PDS (%s) Not Found.", atId)
			return
		}
		s.doOpen = false
		slog.Default().Debug(fmt.Sprintf("Retrieved: %s (%s) at %s", pds.AtId, pds.Did, time.Now().Format(time.RFC3339)))
		s.activePds = pds
		s.updatePdsListing()
		n, err := s.pdsListing.GetActiveNode()
		if err == nil && n != nil {
			s.changePdsList(n)
		}

		s.layout.ActivateWidget(s.columns)
		s.columns.ActivateWidget(s.pdsListing)
	}()
}

func (s *ScreenHome) deleteCurrentRecord() bool {
	tn, err := s.pdsListing.GetActiveNode()
	if err != nil {
		s.Log("error getting active node")
		return false
	}
	tnPath := tn.GetValuePath()
	if len(tnPath) != 2 {
		return false
	}
	//tnLabelPath := tn.GetLabelPath()
	nsid, err := syntax.ParseNSID(tnPath[0])
	if err != nil {
		s.Log("error parsing NSID from %s: %w", tnPath[0], err)
		return false
	}
	rkey := tnPath[1]
	if err := s.r.DeleteRecord(s.activePds.Did, nsid, rkey); err != nil {
		s.Log("error deleting record: %w", err)
	}
	/*
		s.alert.SetTitle("Confirm Deletion")
		s.alert.SetMessage(fmt.Sprintf("Are you sure you want to delete this record?\n%s %s\nThis cannot be undone.", tnLabelPath[0], tnLabelPath[1]))
		s.alert.SetVisible(true)
		s.alert.SetActive(true)
		s.alert.SetOkPressed(func() bool {
			s.r.DeleteRecord(s.activePds.Did, nsid, rkey)
			s.alert.SetVisible(false)
			s.alert.SetActive(false)
			return true
		})
		s.alert.SetCancelPressed(func() bool {
			s.alert.SetVisible(false)
			s.alert.SetActive(false)
			return true
		})
	*/
	return true
}