package main

import (
	"database/sql"
	"errors"
	"fmt"
	"math/rand"
	"os"
	"os/user"
	"strings"
	"time"

	"git.tilde.town/tildetown/town/invites"
	"git.tilde.town/tildetown/town/models"
	"git.tilde.town/tildetown/town/signup"
	tuser "git.tilde.town/tildetown/town/user"
	"github.com/gdamore/tcell/v2"
	"github.com/rivo/tview"
)

func getTitle() string {
	titles := []string{
		"yo bum rush the show",
		"can i kick it?",
		"super nintendo sega genesis",
		"birthdays was the worst days",
		"where were you when we were getting high?",
		"it's real time, real time, time to get real",
	}
	return titles[rand.Intn(len(titles))]
}

type reviewer struct {
	db        *sql.DB
	adminName string
}

func newReviewer(db *sql.DB, adminName string) *reviewer {
	return &reviewer{db: db, adminName: adminName}
}

func (r *reviewer) Review(s *models.TownSignup, decision models.SignupDecision) error {
	s.DecisionTime = time.Now()
	s.Decision = decision
	s.DecidedBy = r.adminName
	return s.Review(r.db)
}

func (r *reviewer) AddNote(s *models.TownSignup, content string) error {
	note := &models.SignupNote{
		Author:   r.adminName,
		Content:  content,
		SignupID: s.ID,
	}

	return note.Insert(r.db)
}

func renderSignup(s models.TownSignup) string {
	out := ""

	pairs := [][]string{
		{"submitted", s.Created.Format("2006-01-02 15:04")},
		{"e-mail", s.Email},
		{"how found / referral", s.How},
		{"why like town / plans", s.Why},
		{"links", s.Links},
	}

	for _, v := range pairs {
		out += fmt.Sprintf("[-:-:b]%s[-:-:-]\n", v[0])
		out += strings.TrimSpace(v[1])
		out += "\n\n"
	}

	return out
}

func renderNotes(s models.TownSignup) string {
	out := ""
	for _, note := range s.Notes {
		out += fmt.Sprintf(`%s said on %s:
  %s`, note.Author, note.Created.Format("2006-01-02 15:04"), note.Content)

		out += "\n\n"

	}
	return out
}

func _main() error {
	inviteDB, err := invites.ConnectDB()
	if err != nil {
		return fmt.Errorf("could not connect to invites database: %w", err)
	}

	signupDB, err := signup.ConnectDB()
	if err != nil {
		return fmt.Errorf("could not connect to signups database: %w", err)
	}

	u, err := user.Current()
	if err != nil {
		return fmt.Errorf("that's my purse. I don't know you! %w", err)
	}
	isAdmin, err := tuser.IsAdmin(u)
	if err != nil {
		return fmt.Errorf("that's my purse. I don't know you! %w", err)
	}

	if !isAdmin {
		return errors.New("this command can only be run by a town admin")
	}

	r := newReviewer(signupDB, u.Username)

	rand.Seed(time.Now().Unix())

	su := models.TownSignup{}

	signups, err := su.All(signupDB)
	if err != nil {
		return fmt.Errorf("could not fetch signups: %w", err)
	}

	signupIx := 0

	title := tview.NewTextView()
	title.SetText(getTitle())
	title.SetTextAlign(tview.AlignCenter)
	title.SetTextColor(tcell.ColorPurple)
	title.SetBackgroundColor(tcell.ColorBlack)

	appView := tview.NewTextView()
	appView.SetScrollable(true)
	appView.SetDynamicColors(true)

	legend := tview.NewTextView()
	legend.SetText("s: skip r: random A: approve R: reject N: notate Q: quit")
	legend.SetTextColor(tcell.ColorPurple)
	legend.SetTextAlign(tview.AlignCenter)
	legend.SetBackgroundColor(tcell.ColorBlack)

	count := tview.NewTextView()
	count.SetDynamicColors(true)
	updateCount := func() {
		count.SetText(fmt.Sprintf("[-:-:b]%d of %d[-:-:-]", signupIx+1, len(signups)))
		if len(signups) == 0 {
			count.SetText("")
		}
	}
	updateCount()

	notesView := tview.NewTextView()
	notesView.SetDynamicColors(true)
	notesView.SetBorder(true).SetBorderColor(tcell.ColorPurple)

	bottomFlex := tview.NewFlex()
	bottomFlex.SetDirection(tview.FlexColumn)
	bottomFlex.AddItem(count, 0, 1, false)
	bottomFlex.AddItem(legend, 0, 10, false)

	innerFlex := tview.NewFlex()
	innerFlex.SetDirection(tview.FlexColumn)
	innerFlex.AddItem(appView, 0, 2, true)
	innerFlex.AddItem(notesView, 0, 1, true)

	mainFlex := tview.NewFlex()
	mainFlex.SetDirection(tview.FlexRow)
	mainFlex.AddItem(title, 1, -1, false)
	mainFlex.AddItem(innerFlex, 0, 1, false)
	mainFlex.AddItem(bottomFlex, 1, -1, false)
	// set scrollable
	mainFlex.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		appView.InputHandler()(event, func (p tview.Primitive) {})
		return nil
	})

	pages := tview.NewPages()

	errorModal := tview.NewModal()
	errorModal.AddButtons([]string{"damn"})
	errorModal.SetDoneFunc(func(ix int, _ string) {
		pages.SwitchToPage("main")
	})

	render := func() {
		if len(signups) == 0 {
			appView.SetText("no signups")
			return
		}
		currSignup := signups[signupIx]
		err := currSignup.RefreshNotes(signupDB)
		if err != nil {
			errorModal.SetText(fmt.Sprintf("error! failed to add note: %s", err.Error()))
			pages.SwitchToPage("error")
		}

		appView.SetText(renderSignup(*currSignup))
		notesView.SetText(renderNotes(*currSignup))
	}

	render()

	notate := tview.NewForm()
	notate.AddTextArea("note", "", 80, 10, 1000, func(string) {})
	notate.AddButton("submit", func() {
		fi := notate.GetFormItemByLabel("note").(*tview.TextArea)
		err = r.AddNote(signups[signupIx], fi.GetText())
		if err != nil {
			errorModal.SetText(fmt.Sprintf("error! failed to add note: %s", err.Error()))
			pages.SwitchToPage("error")
			return
		}

		render()

		pages.SwitchToPage("main")
	})
	notate.AddButton("cancel", func() {
		pages.SwitchToPage("main")
	})

	reviewModal := tview.NewFlex().SetDirection(tview.FlexRow)

	providedEmailView := tview.NewTextView()
	providedEmailView.SetTitle("provided email input")

	reviewForm := tview.NewForm()
	decisionFI := tview.NewDropDown().SetLabel("decision")
	decisionFI.SetOptions([]string{"accepted", "rejected"}, func(_ string, _ int) {})

	cleanEmailInput := tview.NewInputField()
	cleanEmailInput.SetLabel("clean email")
	cleanEmailInput.SetAcceptanceFunc(func(tx string, _ rune) bool { return len(tx) > 0 })

	reviewForm.AddFormItem(decisionFI)
	reviewForm.AddFormItem(cleanEmailInput)
	reviewForm.AddButton("submit", func() {
		currSignup := signups[signupIx]
		cleanEmail := reviewForm.GetFormItemByLabel("clean email").(*tview.InputField).GetText()
		defer func() {
			cleanEmailInput.SetText("")
		}()
		currSignup.CleanEmail = cleanEmail

		decision := models.SignupRejected
		_, d := reviewForm.GetFormItemByLabel("decision").(*tview.DropDown).GetCurrentOption()
		if d == "accepted" {
			decision = models.SignupAccepted
		}

		err := r.Review(currSignup, decision)
		if err != nil {
			errorModal.SetText(fmt.Sprintf("error! failed to submit review: %s", err.Error()))
			pages.SwitchToPage("error")
			return
		}

		newSignups := []*models.TownSignup{}
		for ix, s := range signups {
			if ix != signupIx {
				newSignups = append(newSignups, s)
			}
		}
		signups = newSignups
		if len(signups) > 0 {
			if signupIx >= len(signups) {
				signupIx = 0
			}
		}
		updateCount()
		render()
		if decision == models.SignupAccepted {
			invite := &invites.Invite{
				Email: currSignup.CleanEmail,
			}

			if err = invite.Insert(inviteDB); err != nil {
				errorModal.SetText(fmt.Sprintf("error! failed to create invite: %s", err.Error()))
				pages.SwitchToPage("error")
			}

			if err = sendInviteEmail(*invite); err != nil {
				errorModal.SetText(fmt.Sprintf("error! failed to send welcome email: %s", err.Error()))
				pages.SwitchToPage("error")
			}
		}
		pages.SwitchToPage("main")
	})
	reviewForm.AddButton("cancel", func() {
		pages.SwitchToPage("main")
	})

	reviewModal.AddItem(tview.NewTextView().SetText("provided email input"), 1, 1, false)
	reviewModal.AddItem(providedEmailView, 0, 1, false)
	reviewModal.AddItem(reviewForm, 0, 1, true)

	pages.AddPage("main", mainFlex, true, true)
	pages.AddPage("error", errorModal, false, false)
	pages.AddPage("notate", notate, true, false)
	pages.AddPage("review", reviewModal, true, false)

	app := tview.NewApplication()
	app.SetRoot(pages, true)

	app.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		currPage, _ := pages.GetFrontPage()
		if currPage == "notate" || currPage == "review" {
			return event
		}
		switch event.Rune() {
		case 's':
			signupIx++
			if signupIx == len(signups) {
				signupIx = 0
			}
			updateCount()
			render()
			return nil
		case 'S':
			signupIx--
			if signupIx < 0 {
				signupIx = len(signups) - 1
			}
			updateCount()
			render()
			return nil
		case 'r':
			if len(signups) > 0 {
				signupIx = rand.Intn(len(signups))
				updateCount()
				render()
			}
		case 'A':
			if len(signups) == 0 {
				return nil
			}
			emailVal := signups[signupIx].Email
			providedEmailView.SetText(emailVal)
			/*
				TODO the placeholder doesn't appear to become the default text which is
				what I wanted it to do. Just taking this out so the blank box beckons
				input. Also, it seems like the AcceptanceFunc didn't work since a blank
				value got through.
				cleanEmailInput.SetPlaceholder(
					strings.TrimSpace(strings.ReplaceAll(emailVal, "\n", " ")))
			*/
			decisionFI.SetCurrentOption(0)
			pages.SwitchToPage("review")
			app.SetFocus(cleanEmailInput)
			return nil
		case 'R':
			if len(signups) == 0 {
				return nil
			}
			emailVal := signups[signupIx].Email
			providedEmailView.SetText(emailVal)
			/*
				TODO the placeholder doesn't appear to become the default text which is
				what I wanted it to do. Just taking this out so the blank box beckons
				input. Also, it seems like the AcceptanceFunc didn't work since a blank
				value got through.
				cleanEmailInput.SetPlaceholder(
					strings.TrimSpace(strings.ReplaceAll(emailVal, "\n", " ")))
			*/
			decisionFI.SetCurrentOption(1)
			pages.SwitchToPage("review")
			app.SetFocus(cleanEmailInput)
			return nil
		case 'N':
			if len(signups) == 0 {
				return nil
			}
			pages.SwitchToPage("notate")
			return nil
		case 'Q':
			app.Stop()
		}

		return event
	})

	return app.Run()
}

func main() {
	err := _main()
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}