package tui

import (
	"fmt"
	"os"
	"strconv"

	"charm.land/bubbles/v2/spinner"
	tea "charm.land/bubbletea/v2"
	"github.com/BurntSushi/toml"
)

type Model struct {
	currentStep step
	history     []step // stack of input steps visited, for back navigation
	cursor      int
	width       int
	height      int
	spinner     spinner.Model
	loading     bool

	dockerInstalled bool
	checkDockerDone bool
	checkProgress   float64
	downloadDone    bool
	downloadMessage string
	downloadError   error
	loginData       DockerLoginData

	isPublicIP bool

	loginForm     FormStep
	wireguardForm FormStep
	appForm       FormStep
	serverForm    FormStep
	dbForm        FormStep
	certForm      FormStep
	configValues  ConfigValues

	finishedFile      bool
	configFileError   error
	finishedDockerRun bool
	dockerRunError    error

	err error
}

type DockerLoginData struct {
	Login    string
	Password string
}

type ConfigValues struct {
	Login       map[string]string
	Wireguard   map[string]string
	Server      map[string]string
	Database    map[string]string
	Cert        map[string]string
	Application map[string]string
}

type AppConfig struct {
	Server struct {
		Port        int64  `toml:"port"`
		Timeout     int64  `toml:"timeout_seconds"`
		Environment string `toml:"environment"`
	} `toml:"server"`
	Database struct {
		Type     string `toml:"type"`
		URL      string `toml:"url"`
		MaxConns int64  `toml:"max_conns"`
		MinConns int64  `toml:"min_conns"`
	} `toml:"database"`
	Certificates struct {
		DirPath string `toml:"mapped_dir"`
	} `toml:"certificate"`
	Application struct {
		CentralServerURL string `toml:"central_server_url"`
		EnrollmentToken  string `toml:"enrollment_token"`
	} `toml:"application"`
}

func loadConfig() AppConfig {
	var config AppConfig

	config.Server.Port = 8081
	config.Server.Timeout = 30
	config.Server.Environment = "production"

	config.Database.Type = "postgres"
	config.Database.MaxConns = 10
	config.Database.MinConns = 2

	config.Certificates.DirPath = "/caminho/para/diretorio"

	// Database.URL and Application.CentralServerURL are intentionally left empty so the
	// fields show their placeholder instead of a pre-filled dummy. A real config.toml
	// (re-run) still seeds them through the decode below.

	_, err := os.Stat("config.toml")
	if err == nil {
		if _, err := toml.DecodeFile("config.toml", &config); err != nil {
			fmt.Printf("Error loading config: %v\n", err)
		}
	}

	return config
}

func InitialModel() Model {
	cfg := loadConfig()

	s := spinner.New()
	s.Spinner = spinner.Dot
	s.Style = SpinnerStyle

	return Model{
		currentStep: StepCheckDocker,
		loginForm: NewFormStep("Login no Repositório Docker", []FormField{
			{
				Id:          "user",
				Label:       "Usuário",
				Placeholder: "usuario",
				Type:        FieldTypeText,
			},
			{
				Id:          "password",
				Label:       "Senha",
				Placeholder: "senhaForte123",
				Type:        FieldTypePassword,
			},
		}),
		wireguardForm: NewFormStep("Configurações vproxy", []FormField{
			{
				Id:          "privkey",
				Label:       "Chave Privada",
				Placeholder: "",
				Type:        FieldTypeText,
			},
			{
				Id:          "vip",
				Label:       "IP Virtual",
				Default:     "127.0.0.1",
				Placeholder: "127.0.0.1",
				Type:        FieldTypeText,
			},
			{
				Id:          "psk",
				Label:       "Pre-Shared Key",
				Placeholder: "",
				Type:        FieldTypeText,
			},
			{
				Id:          "proxy_edps",
				Label:       "Proxy EDPS",
				Placeholder: "22:127.0.0.1:22",
				Type:        FieldTypeText,
			},
			{
				Id:          "mtu",
				Label:       "MTU",
				Default:     "1380",
				Placeholder: "1380",
				Type:        FieldTypeNumber,
			},
			{
				Id:      "proto",
				Label:   "Protocolo",
				Default: "UDP",
				Type:    FieldTypeSelect,
				Options: []string{"UDP", "TCP"},
			},
		}),
		serverForm: NewFormStep("Servidor", []FormField{
			{
				Id:          "port",
				Label:       "Porta (host)",
				Placeholder: "8081",
				Default:     strconv.FormatInt(cfg.Server.Port, 10),
				Type:        FieldTypeNumber,
				CharLimit:   4,
			},
			{
				Id:          "timeout",
				Label:       "Timeout (Segundos)",
				Placeholder: "30",
				Default:     strconv.FormatInt(cfg.Server.Timeout, 10),
				Type:        FieldTypeNumber,
				CharLimit:   3,
			},
			{
				Id:      "environment",
				Label:   "Ambiente",
				Default: cfg.Server.Environment,
				Type:    FieldTypeSelect,
				Options: []string{"development", "production"},
			},
			{
				Id:      "seccomp_unconfined",
				Label:   "Modo Compatibilidade (máquinas antigas)",
				Default: "Não",
				Type:    FieldTypeSelect,
				Options: []string{"Não", "Sim"},
			},
		}),
		dbForm: NewFormStep("Banco de Dados", []FormField{
			{
				Id:      "database_type",
				Label:   "Tipo do Banco",
				Default: cfg.Database.Type,
				Type:    FieldTypeSelect,
				Options: []string{"postgres", "oracle"},
			},
			{
				Id:          "database_url",
				Label:       "URL de acesso",
				Placeholder: "postgres://usuario:senha@banco:5432/app_dono_db",
				Default:     cfg.Database.URL,
				Type:        FieldTypeText,
			},
			{
				Id:          "max_conns",
				Label:       "Conexões ativas (máximo)",
				Placeholder: "10",
				Default:     strconv.FormatInt(cfg.Database.MaxConns, 10),
				Type:        FieldTypeNumber,
			},
			{
				Id:          "min_conns",
				Label:       "Conexões ativas (mínimo)",
				Placeholder: "2",
				Default:     strconv.FormatInt(cfg.Database.MinConns, 10),
				Type:        FieldTypeNumber,
			},
		}),
		appForm: NewFormStep("Aplicação", []FormField{
			{
				Id:          "central_server_url",
				Label:       "URL do Servidor Central",
				Placeholder: "https://app-dono-api.vitruvio.com.br:8443",
				Default:     cfg.Application.CentralServerURL,
				Type:        FieldTypeText,
			},
			{
				Id:          "enrollment_token",
				Label:       "Token de Inscrição",
				Placeholder: "token gerado no painel web",
				Default:     cfg.Application.EnrollmentToken,
				Type:        FieldTypeText,
			},
		}),
		certForm: NewFormStep("Certificado", []FormField{
			{
				Id:          "cert_dir_path",
				Label:       "Diretório para armazenar certificados",
				Placeholder: "/caminho/para/diretorio",
				Default:     cfg.Certificates.DirPath,
				Type:        FieldTypeText,
			},
		}),
		spinner: s,
	}
}

func (m Model) Init() tea.Cmd {
	return tea.Batch(CheckDockerCmd(), TickCmd(), m.spinner.Tick)
}

// advance moves to the next step, recording the current step on the history stack when
// it is an input step so that Esc can return to it. Consecutive duplicates are skipped.
func (m *Model) advance(next step) {
	if isInputStep(m.currentStep) {
		if n := len(m.history); n == 0 || m.history[n-1] != m.currentStep {
			m.history = append(m.history, m.currentStep)
		}
	}
	m.currentStep = next
}

// goBack returns to the previous input step on the history stack, if any. It reports
// whether the step changed.
func (m *Model) goBack() bool {
	if len(m.history) == 0 {
		return false
	}
	last := m.history[len(m.history)-1]
	m.history = m.history[:len(m.history)-1]
	m.currentStep = last
	return true
}

// canGoBack reports whether Esc would return to a previous step from the current one.
func (m Model) canGoBack() bool {
	return isInputStep(m.currentStep) && len(m.history) > 0
}