package ui

import (
	"fmt"
	"io"
	"log/slog"
	"os"

	gemlog "git.travisshears.com/travisshears/gemlog-cli/gemlog"
	tea "github.com/charmbracelet/bubbletea"
)

type Page string

const (
	ActionList Page = "actionList"
	EntryList  Page = "entryList"
	Entry      Page = "entry"
)

type SwitchPages struct{ Page Page }
type Notification string
type ErrorMsg struct{ err error }
type GemLogsLoaded struct{ Logs []gemlog.GemlogListEntry }
type GemLogLoaded struct{ Log gemlog.GemlogEntry }

type uiState struct {
	notification string
	errorTxt     string

	page           Page
	entryListPage  EntryListPageModel
	entryPage      EntryPageModel
	actionListPage ActionListPageModel
}

type context struct {
	config *gemlog.Config
}

type model struct {
	ui      uiState
	context *context
}

func initialModel(config *gemlog.Config) model {
	return model{
		ui: uiState{
			page:           ActionList,
			actionListPage: initialActionListPageModel(),
			entryListPage:  initialEntryListPageModel(),
			entryPage:      initialEntryPageModel(),
		},
		context: &context{
			config: config,
		},
	}
}

func (m model) Init() tea.Cmd {
	cmds := make([]tea.Cmd, 0)
	cmds = append(cmds, tea.SetWindowTitle("Gemlog CLI"))
	// TODO: add init commands from other pages
	return tea.Batch(cmds...)
}

func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	cmds := make([]tea.Cmd, 3)
	switch msg := msg.(type) {
	case SwitchPages:
		m.ui.page = msg.Page
	case ErrorMsg:
		m.ui.errorTxt = fmt.Sprintf("%s\n\n", fmt.Errorf("%s", msg))
	case Notification:
		m.ui.notification = fmt.Sprintf("%s\n\n", string(msg))
	case tea.KeyMsg:
		switch msg.String() {
		case "ctrl+c", "q":
			return m, tea.Quit
		}
	}

	actionListM, cmd := m.ui.actionListPage.Update(msg, m.ui.page == ActionList, m.context)
	m.ui.actionListPage = actionListM
	cmds = append(cmds, cmd)

	entryListM, cmd := m.ui.entryListPage.Update(msg, m.ui.page == EntryList, m.context)
	m.ui.entryListPage = entryListM
	cmds = append(cmds, cmd)

	entrytM, cmd := m.ui.entryPage.Update(msg, m.ui.page == Entry, m.context)
	m.ui.entryPage = entrytM
	cmds = append(cmds, cmd)

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

func (m model) View() string {
	if len(m.ui.errorTxt) > 0 {
		return m.ui.errorTxt
	}
	s := ""
	if m.ui.notification != "" {
		s += m.ui.notification
	}

	switch m.ui.page {
	case ActionList:
		s += m.ui.actionListPage.View()
	case EntryList:
		s += m.ui.entryListPage.View()
	case Entry:
		s += m.ui.entryPage.View()
	}

	// s += "\nPress q to quit.\n"

	return s
}

var enableLogs bool = false

func Run() {
	if enableLogs {
		f, err := tea.LogToFile("debug.log", "debug")
		if err != nil {
			fmt.Println("fatal:", err)
			os.Exit(1)
		}
		defer f.Close()
	} else {
		logger := slog.New(slog.NewJSONHandler(io.Discard, nil))
		slog.SetDefault(logger)
	}
	slog.Info("Starting gemlog cli")
	config, err := gemlog.LoadConfig()
	if err != nil {
		fmt.Printf("Error loading config: %v", err)
		os.Exit(1)
	}
	err = gemlog.CheckDBConnection(config)
	if err != nil {
		fmt.Printf("Error checking db connection: %v", err)
		os.Exit(1)
	}
	p := tea.NewProgram(
		initialModel(config),
		tea.WithAltScreen(),       // use the full size of the terminal in its "alternate screen buffer"
		tea.WithMouseCellMotion(), // turn on mouse support so we can track the mouse wheel

	)

	if _, err := p.Run(); err != nil {
		fmt.Printf("Alas, there's been an error: %v", err)
		os.Exit(1)
	}
}