package ui

import (
	"fmt"
	"strings"
	"time"

	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"

	"github.com/atridad/gitea-wrapped/pkg/gitea"
	"github.com/atridad/gitea-wrapped/pkg/models"
	"github.com/atridad/gitea-wrapped/pkg/stats"
)

type screenType int

const (
inputScreenType screenType = iota
loadingScreenType
reportScreenType
)

type tickMsg time.Time
type progressMsg string
type errorMsg string

type doneMsg struct {
repos    []gitea.GiteaRepo
commits  []models.Commit
username string
}

type App struct {
screen        screenType
inputScreen   *InputScreen
reportScreen  *ReportScreen
loadingMsg    string
err           error
giteaClient   *gitea.Client
analyzer      *stats.Analyzer
spinnerFrame  int
repos         []gitea.GiteaRepo
username      string
}

func NewApp() *App {
return &App{
screen:      inputScreenType,
inputScreen: NewInputScreen(),
analyzer:    stats.NewAnalyzer(),
}
}

func (a *App) Init() tea.Cmd {
return a.inputScreen.Init()
}

func (a *App) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
switch msg := msg.(type) {
case tea.KeyMsg:
if msg.Type == tea.KeyCtrlC {
return a, tea.Quit
}
case tickMsg:
if a.screen == loadingScreenType {
a.spinnerFrame = (a.spinnerFrame + 1) % 4
return a, tea.Tick(time.Millisecond*200, func(t time.Time) tea.Msg {
return tickMsg(t)
})
}
}

switch a.screen {
case inputScreenType:
_, cmd := a.inputScreen.Update(msg)

if a.inputScreen.IsDone() {
url, username, token := a.inputScreen.GetCredentials()

if url == "" {
a.inputScreen.err = fmt.Errorf("URL is required")
a.inputScreen.done = false
return a, cmd
}
if username == "" {
a.inputScreen.err = fmt.Errorf("username is required")
a.inputScreen.done = false
return a, cmd
}
if token == "" {
a.inputScreen.err = fmt.Errorf("token is required")
a.inputScreen.done = false
return a, cmd
}

a.giteaClient = gitea.NewClient(url, token)
a.username = username
a.screen = loadingScreenType
a.loadingMsg = "Connecting to Gitea..."
a.spinnerFrame = 0

return a, tea.Batch(cmd,
tea.Tick(time.Millisecond*200, func(t time.Time) tea.Msg {
return tickMsg(t)
}),
a.testConnection())
}

return a, cmd

case loadingScreenType:
switch msg := msg.(type) {
case progressMsg:
a.loadingMsg = string(msg)

switch string(msg) {
case "Fetching repositories...":
return a, a.fetchRepos()
case "Fetching commits...":
return a, a.fetchCommits()
}
return a, nil

case errorMsg:
a.err = fmt.Errorf("%s", msg)
a.loadingMsg = "Error"
return a, nil

case doneMsg:
a.analyzer.AddRepos(msg.repos)
a.analyzer.AddCommits(msg.commits)
userStats := a.analyzer.Generate(msg.username)
a.reportScreen = NewReportScreen(userStats)
a.screen = reportScreenType
return a, nil
}

case reportScreenType:
if a.reportScreen != nil {
_, cmd := a.reportScreen.Update(msg)
return a, cmd
}
}

return a, nil
}

func (a *App) View() string {
switch a.screen {
case inputScreenType:
return a.inputScreen.View()
case loadingScreenType:
return a.renderLoadingScreen()
case reportScreenType:
if a.reportScreen != nil {
return a.reportScreen.View()
}
}
return ""
}

func (a *App) renderLoadingScreen() string {
var s string
s += lipgloss.NewStyle().
Foreground(lipgloss.Color("212")).
Bold(true).
Render("🎵 Gitea Wrapped") + "\n\n"

spinners := []string{"⠋", "⠙", "⠹", "⠸"}
spinner := spinners[a.spinnerFrame%4]

s += fmt.Sprintf("%s %s\n", spinner, a.loadingMsg)

if a.err != nil {
s += "\n" + lipgloss.NewStyle().
Foreground(lipgloss.Color("1")).
Render(fmt.Sprintf("Error: %v", a.err)) + "\n"
}

return s
}

// testConnection tests API connection
func (a *App) testConnection() tea.Cmd {
return func() tea.Msg {
if err := a.giteaClient.TestConnection(); err != nil {
return errorMsg(fmt.Sprintf("failed to connect: %v", err))
}
return progressMsg("Fetching repositories...")
}
}

// fetchRepos fetches all repositories
func (a *App) fetchRepos() tea.Cmd {
return func() tea.Msg {
repos, err := a.giteaClient.GetUserRepos()
if err != nil {
return errorMsg(fmt.Sprintf("failed to fetch repos: %v", err))
}

a.repos = repos
return progressMsg("Fetching commits...")
}
}

// fetchCommits fetches commits from all repos
func (a *App) fetchCommits() tea.Cmd {
return func() tea.Msg {
var commits []models.Commit

for i, repo := range a.repos {

parts := strings.Split(repo.FullName, "/")
if len(parts) < 2 {
continue
}

owner := parts[0]
giteaCommits, err := a.giteaClient.GetRepoCommits(owner, repo.Name)
if err != nil {
continue
}


for _, gc := range giteaCommits {
commits = append(commits, models.Commit{
SHA:       gc.SHA,
Message:   gc.Commit.Message,
Author:    gc.Commit.Author.Name,
Timestamp: gc.Commit.Author.Date,
RepoName:  repo.Name,
})
}
}


return doneMsg{a.repos, commits, a.username}
}
}