package main

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

	"git.tilde.town/tildetown/town/models"
	//"git.tilde.town/tildetown/town/review"
	"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))]
}

// TODO affordance for cleaning up email response

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
	s.Insert(r.db)
	return nil
}

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 := fmt.Sprintf("[-:-:b]submitted:[-:-:-] %s\n", s.Created.Format("2006-01-02 15:04"))

	pairs := map[string]string{
		"e-mail":                  s.Email,
		"how found / referral":    s.How,
		"why like town / what do": s.Why,
		"links":                   s.Links,
	}

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

	return out
}

func _main() error {
	/*
		TODO will use this for invites
		userDB, err := review.ConnectDB()
		if err != nil {
			return fmt.Errorf("could not connect to user 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.SetDynamicColors(true)
	if len(signups) == 0 {
		appView.SetText("no signups found.")
	} else {
		appView.SetText(renderSignup(*signups[signupIx]))
	}

	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 pending signups[-:-:-]", len(signups)))
	}
	updateCount()

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

	mainFlex := tview.NewFlex()
	mainFlex.SetDirection(tview.FlexRow)
	mainFlex.AddItem(title, 1, -1, false)
	mainFlex.AddItem(appView, 0, 1, true)
	mainFlex.AddItem(bottomFlex, 1, -1, false)

	pages := tview.NewPages()

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

	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
		}

		// TODO force redraw of current item

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

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

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

	// TODO replace imperative shit with a signupManager
	advanceSignup := func() {
		if len(signups) == 0 {
			appView.SetText("no signups found.")
			return
		}
		signupIx++
		if signupIx == len(signups) {
			signupIx = 0
		}
		appView.SetText(renderSignup(*signups[signupIx]))
	}

	removeSignup := func(signup *models.TownSignup) {
		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
			}
		}
		appView.SetText(renderSignup(*signups[signupIx]))
	}

	app.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		currPage, _ := pages.GetFrontPage()
		if currPage == "notate" {
			return event
		}
		switch event.Rune() {
		case 's':
			advanceSignup()
		case 'r':
			if len(signups) > 0 {
				signupIx = rand.Intn(len(signups))
				appView.SetText(renderSignup(*signups[signupIx]))
			}
		case 'A':
			if len(signups) == 0 {
				return nil
			}
			// TODO modal for collecting clean email
			signup := signups[signupIx]
			err := r.Review(signup, models.SignupAccepted)
			if err != nil {
				errorModal.SetText(fmt.Sprintf("error! failed to approve '%d': %s", signup.ID, err.Error()))
				pages.SwitchToPage("error")
				return nil
			}
			removeSignup(signup)
			updateCount()
			// TODO generate invite token
			// TODO send invite email
		case 'R':
			if len(signups) == 0 {
				return nil
			}
			signup := signups[signupIx]
			err = r.Review(signup, models.SignupRejected)
			if err != nil {
				errorModal.SetText(fmt.Sprintf("error! failed to reject '%d': %s", signup.ID, err.Error()))
				pages.SwitchToPage("error")
				return nil
			}
			removeSignup(signup)
			updateCount()
		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)
	}
}