package pages

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

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

type ContextPickerPage struct {
	common   *common.Common
	contexts taskwarrior.Contexts
	form     *huh.Form
}

func NewContextPickerPage(common *common.Common) *ContextPickerPage {
	p := &ContextPickerPage{
		common:   common,
		contexts: common.TW.GetContexts(),
	}

	selected := common.TW.GetActiveContext().Name
	options := make([]string, 0)
	for _, c := range p.contexts {
		if c.Name != "none" {
			options = append(options, c.Name)
		}
	}
	slices.Sort(options)
	options = append([]string{"(none)"}, options...)

	p.form = huh.NewForm(
		huh.NewGroup(
			huh.NewSelect[string]().
				Key("context").
				Options(huh.NewOptions(options...)...).
				Title("Contexts").
				Description("Choose a context").
				Value(&selected),
		),
	).
		WithShowHelp(false).
		WithShowErrors(true).
		WithTheme(p.common.Styles.Form)

	return p
}

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

func (p *ContextPickerPage) Init() tea.Cmd {
	return p.form.Init()
}

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

	switch msg := msg.(type) {
	case tea.WindowSizeMsg:
		p.SetSize(msg.Width, msg.Height)
	case tea.KeyMsg:
		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
		}
	}

	f, cmd := p.form.Update(msg)
	if f, ok := f.(*huh.Form); ok {
		p.form = f
		cmds = append(cmds, cmd)
	}

	if p.form.State == huh.StateCompleted {
		cmds = append(cmds, p.updateContextCmd)
		model, err := p.common.PopPage()
		if err != nil {
			slog.Error("page stack empty")
			return nil, tea.Quit
		}
		return model, tea.Batch(cmds...)
	}

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

func (p *ContextPickerPage) View() string {
	return p.common.Styles.Main.Render(p.form.View())
}

func (p *ContextPickerPage) updateContextCmd() tea.Msg {
	context := p.form.GetString("context")
	if context == "(none)" {
		context = ""
	}
	return UpdateContextMsg(p.common.TW.GetContext(context))
}

type UpdateContextMsg *taskwarrior.Context