package session

import (
	"encoding/json"
	"errors"
	"fmt"
	"os"

	"git.andreafazzi.eu/andrea/probo/pkg/models"
	"git.andreafazzi.eu/andrea/probo/pkg/store/file"

	"github.com/charmbracelet/bubbles/key"
	"github.com/charmbracelet/bubbles/spinner"
	btTable "github.com/charmbracelet/bubbles/table"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/glamour"
	"github.com/charmbracelet/huh"
	"github.com/charmbracelet/lipgloss"
	"github.com/d5/tengo/v2"
	"github.com/d5/tengo/v2/stdlib"
	foam "github.com/remogatto/sugarfoam"
	"github.com/remogatto/sugarfoam/components/form"
	"github.com/remogatto/sugarfoam/components/group"
	"github.com/remogatto/sugarfoam/components/header"
	"github.com/remogatto/sugarfoam/components/help"
	"github.com/remogatto/sugarfoam/components/statusbar"
	"github.com/remogatto/sugarfoam/components/table"
	"github.com/remogatto/sugarfoam/components/viewport"
	"github.com/remogatto/sugarfoam/layout"
	"github.com/remogatto/sugarfoam/layout/tiled"
)

var mockSession = `
{"participants":[{"Attributes":{"class":"Math 101A"},"created_at":"2024-04-03T09:22:11.201142494+02:00","firstname":"THOMAS","id":"1024758d-0dba-4bec-aaab-339e87a0649b","lastname":"MANN","token":"427628","updated_at":"2024-05-27T13:48:50.096492274+02:00"},{"Attributes":{"class":"Math 101A"},"created_at":"2024-04-04T10:23:12.203143495+02:00","firstname":"JAMES","id":"f3c5a7bd-6fda-4bce-bbbb-333e88a0650c","lastname":"BROWN","token":"428629","updated_at":"2024-05-27T13:48:50.075089555+02:00"},{"Attributes":{"class":"Math 101A"},"created_at":"2024-04-05T11:24:13.204144496+02:00","firstname":"LUCY","id":"g4d6c8cd-7eda-4cce-cccc-444e89a0661d","lastname":"DOE","token":"429630","updated_at":"2024-05-27T13:48:50.079134348+02:00"}], "quizzes": [{"CorrectPos":0,"answers":[{"created_at":"2024-05-27T13:55:26.448679335+02:00","id":"6771592e-4e2c-45f1-b14f-91f943a5616b","text":"3 + 1 = 1 + 3","updated_at":"2024-05-27T13:55:26.448679428+02:00"},{"created_at":"2024-05-27T13:55:26.448681412+02:00","id":"bad7db2a-f5be-4f22-879a-fd783bb1c0a9","text":"3 - 1 = 1 - 3","updated_at":"2024-05-27T13:55:26.448681456+02:00"},{"created_at":"2024-05-27T13:55:26.448683251+02:00","id":"8ae29e51-65a7-4618-8074-58ee90c4fb83","text":"3 / 2 = 2 / 3","updated_at":"2024-05-27T13:55:26.448683289+02:00"},{"created_at":"2024-05-27T13:55:26.448685048+02:00","id":"7d2a9491-338d-4274-9e62-3d2641788777","text":"-3 + 1 = -1 + 3","updated_at":"2024-05-27T13:55:26.448685085+02:00"}],"correct":{"created_at":"2024-05-27T13:55:26.448679335+02:00","id":"6771592e-4e2c-45f1-b14f-91f943a5616b","text":"3 + 1 = 1 + 3","updated_at":"2024-05-27T13:55:26.448679428+02:00"},"created_at":"2024-05-27T13:49:24.170080837+02:00","hash":"","id":"6a21d3fa-d63c-4acf-9238-551692ed74c4","question":{"created_at":"2024-05-27T13:55:26.448673273+02:00","id":"bf19c1f1-6896-4ca2-b7dc-1657adcce4cd","text":"In #mathematics, for the commutative property of addition, we have\nthat:","updated_at":"2024-05-27T13:55:26.448673633+02:00"},"tags":["#mathematics"],"type":0,"updated_at":"2024-05-27T13:55:26.448701931+02:00"},{"CorrectPos":0,"answers":[{"created_at":"2024-05-27T13:55:26.449222989+02:00","id":"37f741c2-12de-4463-b6c0-42b8b5249e7a","text":"3 * (4 + 5) = 3 * 4 + 3 * 5","updated_at":"2024-05-27T13:55:26.449223079+02:00"},{"created_at":"2024-05-27T13:55:26.44922686+02:00","id":"c60b1b81-5e16-4401-831c-d9fffba1d1eb","text":"6 * (2 - 3) = 6 * 2 + 6 * 3","updated_at":"2024-05-27T13:55:26.449226924+02:00"},{"created_at":"2024-05-27T13:55:26.449230299+02:00","id":"fb0ba30c-1e4e-41a1-9630-7f18aa24a6db","text":"7 * (8 + 2) = 7 * 8 - 7 * 2","updated_at":"2024-05-27T13:55:26.449230351+02:00"},{"created_at":"2024-05-27T13:55:26.449233993+02:00","id":"0cfd6fbb-7aac-4d35-aa17-3e62f5297c68","text":"2 * (1 + 2) = (- 2) * 1 - 4","updated_at":"2024-05-27T13:55:26.449234055+02:00"}],"correct":{"created_at":"2024-05-27T13:55:26.449222989+02:00","id":"37f741c2-12de-4463-b6c0-42b8b5249e7a","text":"3 * (4 + 5) = 3 * 4 + 3 * 5","updated_at":"2024-05-27T13:55:26.449223079+02:00"},"created_at":"2024-05-27T13:49:24.173550821+02:00","hash":"","id":"40aa188a-46c6-4f26-9a1e-4d5a028ba367","question":{"created_at":"2024-05-27T13:55:26.449216807+02:00","id":"723acb0a-5c60-4062-8615-fd3494220b4d","text":"In #mathematics, the distributive property allows us to multiply a sum\nor difference by a single number. Which statement correctly applies\nthis property?","updated_at":"2024-05-27T13:55:26.449216918+02:00"},"tags":["#mathematics"],"type":0,"updated_at":"2024-05-27T13:55:26.449281612+02:00"},{"CorrectPos":0,"answers":[{"created_at":"2024-05-27T13:55:26.449440615+02:00","id":"11be2252-45f0-44c1-a9f0-19dcdcd45b68","text":"1","updated_at":"2024-05-27T13:55:26.449440713+02:00"},{"created_at":"2024-05-27T13:55:26.449452222+02:00","id":"971fbf3b-27b1-4b67-9636-ac681056ce62","text":"0","updated_at":"2024-05-27T13:55:26.449452291+02:00"},{"created_at":"2024-05-27T13:55:26.449455664+02:00","id":"d35104b1-37f9-4312-aa21-a470650cb4dc","text":"2","updated_at":"2024-05-27T13:55:26.44945573+02:00"},{"created_at":"2024-05-27T13:55:26.449459322+02:00","id":"220077d2-1994-40ed-8d28-f39d2ebb8dcf","text":"3","updated_at":"2024-05-27T13:55:26.449459397+02:00"}],"correct":{"created_at":"2024-05-27T13:55:26.449440615+02:00","id":"11be2252-45f0-44c1-a9f0-19dcdcd45b68","text":"1","updated_at":"2024-05-27T13:55:26.449440713+02:00"},"created_at":"2024-05-27T13:49:24.175865713+02:00","hash":"","id":"f9fab318-3373-4729-a80f-b681460824e3","question":{"created_at":"2024-05-27T13:55:26.449432971+02:00","id":"af7d973a-a83c-4a18-ac36-92ab6442ef07","text":"In #mathematics, certain numbers have special properties. Identify the\nidentity element for multiplication among the options given:","updated_at":"2024-05-27T13:55:26.449433136+02:00"},"tags":["#mathematics"],"type":0,"updated_at":"2024-05-27T13:55:26.449476666+02:00"}]}`

type SessionModel struct {
	// UI
	form      *form.Model
	viewport  *viewport.Model
	table     *table.Model
	group     *group.Model
	help      *help.Model
	statusBar *statusbar.Model
	spinner   spinner.Model

	// Layout
	document *layout.Layout

	// Key bindings
	bindings *keyBindings

	// store
	store    *file.SessionFileStore
	lenStore int
	result   []any

	// json
	InputJson string
	Result    string

	// session
	session *models.Session

	// markdown
	mdRenderer *glamour.TermRenderer

	// filter file
	scriptFilePath string

	state int
}

func New(path string, stdin string) *SessionModel {
	form := form.New(
		form.WithGroups(huh.NewGroup(
			huh.NewInput().
				Key("sessionTitle").
				Title("Session title").
				Description("Enter the title of the session").
				Validate(func(str string) error {
					if str == "" {
						return errors.New("You must set a session name!")
					}
					return nil

				}),
		)))

	formBinding := huh.NewDefaultKeyMap()
	formBinding.Input.Next = key.NewBinding(key.WithKeys("down"), key.WithHelp("down", "next"))
	formBinding.Input.Prev = key.NewBinding(key.WithKeys("up"), key.WithHelp("up", "prev"))
	formBinding.Confirm.Next = key.NewBinding(key.WithKeys("down"), key.WithHelp("down", "next"))
	formBinding.Confirm.Prev = key.NewBinding(key.WithKeys("up"), key.WithHelp("up", "prev"))

	form.WithShowHelp(false).WithTheme(huh.ThemeDracula()).WithKeyMap(formBinding)

	viewport := viewport.New()

	table := table.New(table.WithRelWidths(20, 10, 25, 25, 20))
	table.Model.SetColumns([]btTable.Column{
		{Title: "UUID", Width: 20},
		{Title: "Token", Width: 20},
		{Title: "Lastname", Width: 20},
		{Title: "Firstname", Width: 20},
		{Title: "Class", Width: 20},
	})

	group := group.New(
		group.WithItems(form, table, viewport),
		group.WithLayout(
			layout.New(
				layout.WithStyles(&layout.Styles{Container: lipgloss.NewStyle().Padding(1, 1)}),
				layout.WithItem(form),
				layout.WithItem(tiled.New(table, viewport)),
			),
		),
	)

	bindings := newBindings(group)
	statusBar := statusbar.New(bindings)

	s := spinner.New(
		spinner.WithStyle(
			lipgloss.NewStyle().Foreground(lipgloss.Color("265"))),
	)
	s.Spinner = spinner.Dot

	header := header.New(
		header.WithContent(
			lipgloss.NewStyle().
				Bold(true).
				Border(lipgloss.NormalBorder(), false, false, true, false).
				Render("✨ Create session ✨"),
		),
	)

	help := help.New(
		bindings,
		help.WithStyles(&foam.Styles{NoBorder: lipgloss.NewStyle().Padding(1, 1)}))

	document := layout.New(
		layout.WithStyles(&layout.Styles{Container: lipgloss.NewStyle().Margin(1)}),
		layout.WithItem(header),
		layout.WithItem(group),
		layout.WithItem(help),
		layout.WithItem(statusBar),
	)

	renderer, err := glamour.NewTermRenderer(
		glamour.WithStandardStyle("dracula"),
		glamour.WithWordWrap(80),
	)
	if err != nil {
		panic(err)
	}

	return &SessionModel{
		form:           form,
		table:          table,
		viewport:       viewport,
		group:          group,
		statusBar:      statusBar,
		spinner:        s,
		document:       document,
		mdRenderer:     renderer,
		bindings:       bindings,
		help:           help,
		scriptFilePath: path,
		InputJson:      stdin,
	}

}

func (m *SessionModel) Init() tea.Cmd {
	var cmds []tea.Cmd

	cmds = append(cmds, m.group.Init(), m.loadStore(), m.spinner.Tick)

	m.group.Focus()

	return tea.Batch(cmds...)
}

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

	switch msg := msg.(type) {

	case tea.WindowSizeMsg:
		m.handleWindowSize(msg)

	case tea.KeyMsg:
		switch {
		case key.Matches(msg, m.bindings.quit):
			cmds = append(cmds, tea.Quit)
		}

	case storeLoadedMsg:
		cmds = append(cmds, m.handleStoreLoaded(msg))

	case scriptExecutedMsg:
		m.handleScriptExecuted(msg)

	case errorMsg:
		m.handleError(msg)
		m.state = ErrorState
	}

	cmds = m.handleState(msg, cmds)

	return m, tea.Batch(cmds...)
}

func (m *SessionModel) View() string {
	return m.document.View()
}

func (m *SessionModel) marshalJSON() (string, error) {
	session, err := m.createSession()
	if err != nil {
		return "", err
	}
	resultJson, err := json.Marshal(session)
	if err != nil {
		return "", err
	}

	return string(resultJson), nil
}

func (m *SessionModel) executeScript() tea.Cmd {
	return func() tea.Msg {
		if m.scriptFilePath == "" {
			return nil
		}

		sessionJson, err := json.Marshal(models.Session{Exams: map[string]*models.Exam{}})
		if err != nil {
			panic(err)
		}

		script, err := os.ReadFile(m.scriptFilePath)
		if err != nil {
			panic(err)
		}

		s := tengo.NewScript(script)

		s.SetImports(stdlib.GetModuleMap("fmt", "json", "rand", "times"))
		_ = s.Add("input", m.InputJson)
		_ = s.Add("output", string(sessionJson))

		c, err := s.Compile()
		if err != nil {
			panic(err)
		}

		if err := c.Run(); err != nil {
			panic(err)
		}

		return scriptExecutedMsg{fmt.Sprintf("%s", c.Get("output"))}

	}
}

func (m *SessionModel) createSession() (*models.Session, error) {
	m.session.Title = m.form.GetString("sessionTitle")

	session, err := m.store.Storer.Create(m.session)
	if err != nil {
		return nil, err
	}

	return session, err
}

func (m *SessionModel) showErrorOnStatusBar(err error) {
	m.statusBar.SetContent(
		stateFormats[ErrorState][0],
		fmt.Sprintf(stateFormats[ErrorState][1], err),
		stateFormats[ErrorState][2],
	)
}

func (m *SessionModel) updateTableContent(session *models.Session) {
	rows := make([]btTable.Row, 0)

	for _, exam := range session.Exams {
		rows = append(rows, btTable.Row{
			exam.Participant.ID,
			exam.Participant.Token,
			exam.Participant.Lastname,
			exam.Participant.Firstname,
			exam.Participant.Attributes.Get("class"),
		})

	}

	m.table.SetRows(rows)
}

func (m *SessionModel) updateViewportContent(session *models.Session) {
	if len(m.table.Rows()) == 0 {
		panic(errors.New("Session have not exams"))
	}

	currentUUID := m.table.SelectedRow()[0]
	currentExam := session.Exams[currentUUID]

	if currentExam == nil {
		panic("Current token is not associate to any exam!")
	}

	// md, err := currentExam.ToMarkdown()
	// if err != nil {
	// 	m.showErrorOnStatusBar(err)
	// }

	// data, err := currentExam.Marshal()
	// if err != nil {
	// 	panic(err)
	// }

	// result, err := m.mdRenderer.Render(md)
	// if err != nil {
	// 	m.showErrorOnStatusBar(err)
	// }

	//	m.viewport.SetContent(result)
	// m.viewport.SetContent(string(data))
	m.viewport.SetContent(mockSession)
}

func (m *SessionModel) createMDRenderer() *glamour.TermRenderer {
	renderer, err := glamour.NewTermRenderer(
		glamour.WithStandardStyle("dracula"),
		glamour.WithWordWrap(m.viewport.GetWidth()),
	)
	if err != nil {
		panic(err)
	}
	return renderer
}

func (m *SessionModel) handleWindowSize(msg tea.WindowSizeMsg) {
	m.group.SetSize(msg.Width, msg.Height)
	m.document.SetSize(msg.Width, msg.Height)
	m.mdRenderer = m.createMDRenderer()
}

func (m *SessionModel) handleError(msg tea.Msg) {
	err := msg.(errorMsg)

	m.statusBar.SetContent(
		stateFormats[ErrorState][0],
		fmt.Sprintf(stateFormats[ErrorState][1], err.error),
		stateFormats[ErrorState][2],
	)
}

func (m *SessionModel) handleScriptExecuted(msg tea.Msg) {
	session := new(models.Session)
	jsonData := []byte(msg.(scriptExecutedMsg).result)

	err := json.Unmarshal(jsonData, &session)
	if err != nil {
		panic(err)
	}

	m.session = session

	m.updateTableContent(session)
	m.updateViewportContent(session)

	m.state = BrowseState
}

func (m *SessionModel) handleStoreLoaded(msg tea.Msg) tea.Cmd {
	storeMsg := msg.(storeLoadedMsg)

	m.store = storeMsg.store
	m.lenStore = len(m.store.ReadAll())

	return m.executeScript()

}

func (m *SessionModel) handleState(msg tea.Msg, cmds []tea.Cmd) []tea.Cmd {
	_, cmd := m.group.Update(msg)

	if m.state == LoadingStoreState {
		return m.updateSpinner(msg, cmd, cmds)
	}

	if m.form.State == huh.StateCompleted {
		var err error

		m.Result, err = m.marshalJSON()
		if err != nil {
			panic(err)
		}

		cmds = append(cmds, tea.Quit)
	}

	if len(m.form.Errors()) > 0 {
		m.state = ErrorState
		for _, err := range m.form.Errors() {
			m.showErrorOnStatusBar(err)
		}
	} else {
		m.state = BrowseState
	}

	if m.state == BrowseState {
		m.updateViewportContent(m.session)
	}

	if m.state != ErrorState {
		m.statusBar.SetContent(
			stateFormats[BrowseState][0],
			fmt.Sprintf(stateFormats[BrowseState][1], m.lenStore, len(m.session.Exams)),
			stateFormats[BrowseState][2],
		)
	}

	cmds = append(cmds, cmd)

	return cmds
}

func (m *SessionModel) updateSpinner(msg tea.Msg, cmd tea.Cmd, cmds []tea.Cmd) []tea.Cmd {
	m.spinner, cmd = m.spinner.Update(msg)

	m.statusBar.SetContent(fmt.Sprintf(stateFormats[m.state][0], m.spinner.View()), stateFormats[m.state][1], stateFormats[m.state][2])

	cmds = append(cmds, cmd)

	return cmds
}

func (m *SessionModel) loadStore() tea.Cmd {
	return func() tea.Msg {
		sStore, err := file.NewDefaultSessionFileStore()
		if err != nil {
			panic(err)
		}

		return storeLoadedMsg{sStore}
	}
}