package settings

import (
	"strings"

	"git.mlow.ca/mlow/lmcli/pkg/tui/bubbles/list"
	"git.mlow.ca/mlow/lmcli/pkg/tui/model"
	"git.mlow.ca/mlow/lmcli/pkg/tui/shared"
	"git.mlow.ca/mlow/lmcli/pkg/tui/styles"
	"github.com/charmbracelet/bubbles/viewport"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
)

type Model struct {
	App       *model.AppModel
	prevView  shared.View
	content   viewport.Model
	modelList list.Model
	width     int
	height    int
}

type modelOpt struct {
	provider string
	model    string
}

const (
	modelListId int = iota + 1
)

func Settings(app *model.AppModel) *Model {
	m := &Model{
		App:     app,
		content: viewport.New(0, 0),
	}
	return m
}

func (m *Model) Init() tea.Cmd {
	m.modelList = list.NewWithGroups(m.getModelOptions())
	m.modelList.ID = modelListId
	return nil
}

func (m *Model) Update(msg tea.Msg) (shared.ViewModel, tea.Cmd) {
	var cmd tea.Cmd

	switch msg := msg.(type) {
	case tea.KeyMsg:
		m.modelList, cmd = m.modelList.Update(msg)
		if cmd != nil {
			return m, cmd
		}

		switch msg.String() {
		case "esc":
			return m, func() tea.Msg {
				return shared.MsgViewChange(m.prevView)
			}
		}
	case shared.MsgViewEnter:
		m.prevView = shared.View(msg)
		m.modelList.Focus()
		m.content.SetContent(m.renderContent())
	case tea.WindowSizeMsg:
		m.width, m.height = msg.Width, msg.Height
		m.content.Width = msg.Width
		m.content.Height = msg.Height
		m.content.SetContent(m.renderContent())
	case list.MsgOptionSelected:
		switch msg.ID {
		case modelListId:
			if modelOpt, ok := msg.Option.Value.(modelOpt); ok {
				m.App.Model = modelOpt.model
				m.App.ProviderName = modelOpt.provider
			}
			return m, shared.ChangeView(m.prevView)
		}
	}

	m.modelList, cmd = m.modelList.Update(msg)
	if cmd != nil {
		return m, cmd
	}

	m.content.SetContent(m.renderContent())
	return m, nil
}

func (m *Model) getModelOptions() []list.OptionGroup {
	modelOpts := []list.OptionGroup{}
	for _, p := range m.App.Ctx.Config.Providers {
		provider := p.Name
		if provider == "" {
			provider = p.Kind
		}
		providerLabel := p.Display
		if providerLabel == "" {
			providerLabel = strings.ToUpper(provider[:1]) + provider[1:]
		}
		group := list.OptionGroup{
			Name: providerLabel,
		}
		for _, model := range p.Models {
			group.Options = append(group.Options, list.Option{
				Label: model,
				Value: modelOpt{provider, model},
			})
		}
		modelOpts = append(modelOpts, group)
	}
	return modelOpts
}

func (m *Model) Header(width int) string {
	boldStyle := lipgloss.NewStyle().Bold(true)
	// TODO: update header depending on active settings mode (model, agent, etc)
	header := boldStyle.Render("Model selection")
	return styles.Header.Width(width).Render(header)
}

func (m *Model) Content(width, height int, errors string) string {
	// TODO: see Header()
	currentModel := " Active model: " + m.App.ActiveModel(lipgloss.NewStyle())
	m.modelList.Width, m.modelList.Height = width, height - 2
	content := "\n" + currentModel + "\n" + m.modelList.View()
	if errors != "" {
		content += errors
	}
	return content
}

func (m *Model) Footer(width int) string {
	return ""
}

func (m *Model) renderContent() string {
	return m.modelList.View()
}