package main

import (
	"fmt"
	"os"
	"time"

	"github.com/charmbracelet/bubbles/key"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/taigrr/gico/commits"
)

type errMsg error

type model struct {
	SettingsModel  Settings
	GraphModel     Graph
	CommitLogModel CommitLog
	HelpModel      Help
	quitting       bool
	cursor         Cursor
	err            error
}

type Help struct{}

type CommitLog struct{}

type Settings struct{}

type Graph struct {
	Selected int
	Year     int
	Repos    []string
	Authors  []string
}

var quitKeys = key.NewBinding(
	key.WithKeys("q", "esc", "ctrl+c"),
	key.WithHelp("", "press q to quit"),
)

const (
	settings Cursor = iota
	graph
	commitLog
)

type Cursor int

func initialModel() (model, error) {
	var m model
	var err error
	m.GraphModel, err = NewGraph()
	if err != nil {
		return m, err
	}
	m.cursor = graph
	return m, nil
}

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

func (m Settings) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	return m, nil
}

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

func (m Settings) View() string {
	return ""
}

func (m CommitLog) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	return m, nil
}

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

func (m CommitLog) View() string {
	return ""
}

func (m Graph) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case tea.KeyMsg:
		switch msg.String() {
		case "down":
			if m.Selected%7 != 6 {
				m.Selected++
			}
		case "up":
			if m.Selected%7 != 0 {
				m.Selected--
			}
		case "left":
			if m.Selected > 6 {
				m.Selected -= 7
			} else {
				// TODO calculate the square for this day last year
			}
		case "right":
			if m.Selected < 358 {
				m.Selected += 7
			} else {
				// TODO
			}
		}
	}
	return m, nil
}

func NewGraph() (Graph, error) {
	var m Graph
	now := time.Now()
	today := now.YearDay() - 1
	year := now.Year()
	aName, _ := commits.GetAuthorName()
	aEmail, _ := commits.GetAuthorEmail()
	authors := []string{aName, aEmail}
	mr, err := commits.GetMRRepos()
	if err != nil {
		return m, err
	}
	m.Repos = mr
	m.Authors = authors
	m.Year = year
	m.Selected = today
	return m, nil
}

func (m Graph) Init() tea.Cmd {
	go func() {
		mr := commits.RepoSet(m.Repos)
		mr.FrequencyChan(m.Year-1, m.Authors)
	}()
	return nil
}

func (m Graph) View() string {
	mr := commits.RepoSet(m.Repos)
	gfreq, _ := mr.FrequencyChan(m.Year, m.Authors)
	return gfreq.StringSelected(m.Selected)
}

func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch cmd := msg.(type) {

	case tea.KeyMsg:
		if key.Matches(cmd, quitKeys) {
			m.quitting = true
			return m, tea.Quit
		}
	case errMsg:
		m.err = cmd
		return m, nil

	default:
	}
	switch m.cursor {
	case graph:
		tmp, cmd := m.GraphModel.Update(msg)
		m.GraphModel, _ = tmp.(Graph)
		return m, cmd
	}
	return m, nil
}

func (m model) View() string {
	if m.err != nil {
		return m.err.Error()
	}
	if m.quitting {
		return ""
	}
	return m.GraphModel.View()
}

func main() {
	m, err := initialModel()
	if err != nil {
		panic(err)
	}
	p := tea.NewProgram(m)
	if _, err := p.Run(); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}