package pages

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

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

type ReportPickerPage struct {
	common  *common.Common
	reports taskwarrior.Reports
	picker  *picker.Picker
}

func NewReportPickerPage(common *common.Common, activeReport *taskwarrior.Report) *ReportPickerPage {
	p := &ReportPickerPage{
		common:  common,
		reports: common.TW.GetReports(),
	}

	itemProvider := func() []list.Item {
		options := make([]string, 0)
		for _, r := range p.reports {
			options = append(options, r.Name)
		}
		slices.Sort(options)

		items := []list.Item{}
		for _, opt := range options {
			items = append(items, picker.NewItem(opt))
		}
		return items
	}

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

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

	if activeReport != nil {
		p.picker.SelectItemByFilterValue(activeReport.Name)
	}

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

	return p
}

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

type reportSelectedMsg struct {
	item list.Item
}

func (p *ReportPickerPage) 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 reportSelectedMsg:
		reportName := msg.item.FilterValue()
		report := p.common.TW.GetReport(reportName)

		model, err := p.common.PopPage()
		if err != nil {
			slog.Error("page stack empty")
			return nil, tea.Quit
		}
		return model, func() tea.Msg { return UpdateReportMsg(report) }
	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 *ReportPickerPage) 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 UpdateReportMsg *taskwarrior.Report