package pages

import (
	"log/slog"
	"tasksquire/common"
	"tasksquire/components/picker"

	"github.com/charmbracelet/bubbles/key"
	"github.com/charmbracelet/bubbles/list"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
)

type TimespanPickerPage struct {
	common           *common.Common
	picker           *picker.Picker
	selectedTimespan string
}

func NewTimespanPickerPage(common *common.Common, currentTimespan string) *TimespanPickerPage {
	p := &TimespanPickerPage{
		common:           common,
		selectedTimespan: currentTimespan,
	}

	timespanOptions := []list.Item{
		picker.NewItem(":day"),
		picker.NewItem(":yesterday"),
		picker.NewItem(":week"),
		picker.NewItem(":lastweek"),
		picker.NewItem(":month"),
		picker.NewItem(":lastmonth"),
		picker.NewItem(":year"),
	}

	itemProvider := func() []list.Item {
		return timespanOptions
	}

	onSelect := func(item list.Item) tea.Cmd {
		return func() tea.Msg { return timespanSelectedMsg{item: item} }
	}

	p.picker = picker.New(common, "Select Timespan", itemProvider, onSelect)

	// Select the current timespan in the picker
	p.picker.SelectItemByFilterValue(currentTimespan)

	p.SetSize(common.Width(), common.Height())

	return p
}

func (p *TimespanPickerPage) SetSize(width, height int) {
	p.common.SetSize(width, height)

	// Set list size with some padding/limits to look like a picker
	listWidth := width - 4
	if listWidth > 40 {
		listWidth = 40
	}
	listHeight := height - 6
	if listHeight > 20 {
		listHeight = 20
	}
	p.picker.SetSize(listWidth, listHeight)
}

func (p *TimespanPickerPage) Init() tea.Cmd {
	return p.picker.Init()
}

type timespanSelectedMsg struct {
	item list.Item
}

func (p *TimespanPickerPage) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	var cmd tea.Cmd

	switch msg := msg.(type) {
	case tea.WindowSizeMsg:
		p.SetSize(msg.Width, msg.Height)
	case timespanSelectedMsg:
		timespan := msg.item.FilterValue()

		model, err := p.common.PopPage()
		if err != nil {
			slog.Error("page stack empty")
			return nil, tea.Quit
		}
		return model, func() tea.Msg { return UpdateTimespanMsg(timespan) }
	case tea.KeyMsg:
		if !p.picker.IsFiltering() {
			switch {
			case key.Matches(msg, p.common.Keymap.Back):
				model, err := p.common.PopPage()
				if err != nil {
					slog.Error("page stack empty")
					return nil, tea.Quit
				}
				return model, BackCmd
			}
		}
	}

	_, cmd = p.picker.Update(msg)
	return p, cmd
}

func (p *TimespanPickerPage) View() string {
	width := p.common.Width() - 4
	if width > 40 {
		width = 40
	}

	content := p.picker.View()
	styledContent := lipgloss.NewStyle().Width(width).Render(content)

	return lipgloss.Place(
		p.common.Width(),
		p.common.Height(),
		lipgloss.Center,
		lipgloss.Center,
		p.common.Styles.Base.Render(styledContent),
	)
}

type UpdateTimespanMsg string