package tui

import (
	"sevenkeys/constants"
	"sevenkeys/figlet"
	"sevenkeys/tui/searchui"
	"sevenkeys/tui/updateui"
	"strings"

	"github.com/charmbracelet/bubbles/help"
	"github.com/charmbracelet/bubbles/key"
	tea "github.com/charmbracelet/bubbletea"
)

type sessionState int

const (
	homeView sessionState = iota
	updateView
	searchView
)

type homeKeyMappings struct {
	Update         key.Binding
	SearchCriteria key.Binding
	Search         key.Binding
	StorageOptions key.Binding
	Find           key.Binding
	Quit           key.Binding
}

func (k homeKeyMappings) ShortHelp() []key.Binding {
	return []key.Binding{k.Update, k.SearchCriteria, k.Search, k.StorageOptions, k.Find, k.Quit}
}

func (k homeKeyMappings) FullHelp() [][]key.Binding {
	return [][]key.Binding{
		{k.Update, k.SearchCriteria, k.Search},
		{k.StorageOptions, k.Find, k.Quit},
	}
}

type MainModel struct {
	state       sessionState
	updateModel tea.Model
	searchModel tea.Model

	help        help.Model
	keyMappings homeKeyMappings
}

func NewMainModel() MainModel {
	help := help.New()
	help.ShortSeparator = help.FullSeparator

	updateModel := updateui.NewUpdateModel()
	searchModel := searchui.NewSearchModel()

	keyMappings := homeKeyMappings{
		Update: key.NewBinding(
			key.WithKeys("u"),
			key.WithHelp("u", "update database"),
		),
		SearchCriteria: key.NewBinding(
			key.WithKeys("c"),
			key.WithHelp("c", "card printing search criteria"),
		),
		Search: key.NewBinding(
			key.WithKeys("s"),
			key.WithHelp("s", "card printing search"),
		),
		StorageOptions: key.NewBinding(
			key.WithKeys("o"),
			key.WithHelp("o", "card storage options"),
		),
		Find: key.NewBinding(
			key.WithKeys("f"),
			key.WithHelp("f", "find in storage"),
		),
		Quit: key.NewBinding(
			key.WithKeys("ctrl+c", "q"),
			key.WithHelp("q", "quit program"),
		),
	}

	return MainModel{
		state:       homeView,
		updateModel: updateModel,
		searchModel: searchModel,

		help:        help,
		keyMappings: keyMappings,
	}
}

func (m MainModel) Init() tea.Cmd {
	return nil
}

func renderHomeScreen(m MainModel) string {
	var ui string

	// Display splash screen
	ui += figlet.SprintMsgSlant("SEVENKEYS", "center")
	ui += figlet.SprintMsgTerm("the ultimate Magic: the Gathering trading card storage system", "center")

	// Display help
	ui += strings.Repeat("\n", constants.WindowHeight-8) // TODO: Avoid hardcoding height somehow
	ui += m.help.View(m.keyMappings)

	return ui
}

func (m MainModel) View() string {
	var ui string

	if constants.WindowWidth <= 0 {
		return ui
	}

	switch m.state {
	case homeView:
		ui += renderHomeScreen(m)
		break
	case updateView:
		ui += m.updateModel.View()
		break
	case searchView:
		ui += m.searchModel.View()
		break
	}

	return ui
}

func (m MainModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	var cmd tea.Cmd
	var cmds []tea.Cmd

	switch msg := msg.(type) {
	case tea.WindowSizeMsg:
		constants.WindowHeight = msg.Height
		constants.WindowWidth = msg.Width
		m.help.Width = msg.Width
	case tea.KeyMsg:
		switch {
		case key.Matches(msg, m.keyMappings.Quit):
			return m, tea.Quit
		}
	case updateui.BackMsg:
		m.state = homeView
	}

	switch m.state {
	case homeView:
		switch msg := msg.(type) {
		case tea.KeyMsg:
			switch {
			case key.Matches(msg, m.keyMappings.Update):
				m.state = updateView
			case key.Matches(msg, m.keyMappings.Search):
				m.state = searchView
			}
		}
	case updateView:
		newUpdate, newCmd := m.updateModel.Update(msg)

		newUpdateModel, ok := newUpdate.(updateui.Model)
		if !ok {
			panic("Could not perform assertion on updateui.Model")
		}

		m.updateModel = newUpdateModel
		cmd = newCmd
	case searchView:
		newSearch, newCmd := m.searchModel.Update(msg)
		newSearchModel, ok := newSearch.(searchui.Model)
		if !ok {
			panic("Could not perform assertion on searchui.Model")
		}

		m.searchModel = newSearchModel
		cmd = newCmd
	}

	cmds = append(cmds, cmd)
	return m, tea.Batch(cmds...)
}