package main

import (
	"fmt"
	"os"
	"os/exec"

	"github.com/charmbracelet/bubbles/textinput"
	tea "github.com/charmbracelet/bubbletea"
)

type detailsModel struct {
	returnTo      tea.Model
	validationMsg string
	snippet       snippetDetails
	ti            textinput.Model
}

type snippetDetails struct {
	name     string
	prevName string
	contents string
}

func (m detailsModel) Init() tea.Cmd {
	return nil
}

func (m detailsModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	var cmd tea.Cmd

	switch msg := msg.(type) {
	case tea.KeyMsg:
		switch msg.Type {
		case tea.KeyEnter:
			m.snippet.name = m.ti.Value()
			if len(m.snippet.name) == 0 || len(m.snippet.name) > 250 {
				m.validationMsg = "Name must be 0-250 characters"
				return m, nil
			}

			return m.returnTo, tea.Batch(m.returnTo.Init(), saveSnippetCmd(m.snippet))
		case tea.KeyCtrlC, tea.KeyEsc:
			// exit without saving
			return m.returnTo, m.returnTo.Init()
		}
	case fatalErrorMsg:
		fmt.Printf("encountered fatal error: %s\n", msg.Error())
		return m, tea.Quit
	}
	m.ti, cmd = m.ti.Update(msg)
	return m, cmd
}

func (m detailsModel) View() string {
	out := "Enter snippet name\n"
	out += errorTextStyle.Render(m.validationMsg) + "\n"
	out += m.ti.View()
	return appStyle.Render(out)
}

func switchToDetails(returnTo tea.Model, snippet snippetDetails) (tea.Model, tea.Cmd) {
	ti := textinput.New()
	ti.Placeholder = "Snippet name"
	ti.Focus()
	ti.CharLimit = 250
	ti.SetValue(snippet.name)

	m := detailsModel{returnTo, "", snippet, ti}
	return m, m.Init()
}

func saveSnippetCmd(snippet snippetDetails) tea.Cmd {
	return func() tea.Msg {
		err := saveSnippet(snippet)
		if err != nil {
			return fatalErrorMsg(err)
		}

		return updateListMsg{}
	}

}

type updateListMsg struct{}

type vimFinishedMsg struct {
	snippet snippetDetails
	err     error
}

func newItemCmd() tea.Cmd {
	return editContentsCmd("", snippetDetails{})
}

func editItemCmd(item item) tea.Cmd {
	return editContentsCmd(item.contents, snippetDetails{name: item.title, prevName: item.title, contents: item.contents})
}

func deleteItemCmd(item item) tea.Cmd {
	return func() tea.Msg {
		err := deleteItem(item)
		if err != nil {
			return fatalErrorMsg(err)
		}

		return updateListMsg{}
	}
}

func editContentsCmd(existingContents string, snippet snippetDetails) tea.Cmd {
	f, _ := os.CreateTemp("", "doe.sh")
	name := f.Name()
	f.WriteString(existingContents)
	f.Close()

	c := exec.Command("vim", f.Name())

	return tea.ExecProcess(c, func(err error) tea.Msg {
		contents, _ := os.ReadFile(name)
		snippet.contents = string(contents)

		return vimFinishedMsg{snippet, err}
	})
}