package tui

import (
	"fmt"
	"math/rand"

	"charm.land/bubbles/v2/spinner"
	tea "charm.land/bubbletea/v2"
)

const (
	imageName           = "hub.davinti.com.br:443/app-dono/app-cliente:latest"
	wireguardImageName  = "hub.davinti.com.br:443/davinti-vproxy:latest"
	updaterImageName    = "docker:cli"
	configPath          = "config.toml"
	wireguardConfigPath = "envs"
)

func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	if key, ok := msg.(tea.KeyPressMsg); ok {
		switch key.String() {
		case "ctrl+c":
			return m, tea.Quit
		case "esc":
			// Global "back" on input steps. Action/wait steps handle esc themselves.
			if m.canGoBack() {
				m.goBack()
				return m, nil
			}
		}
	}

	switch msg := msg.(type) {
	case tea.WindowSizeMsg:
		m.width = msg.Width
		m.height = msg.Height

		// Fit inputs to the terminal: subtract the left padding, the "> " prompt and
		// the cursor cell, with a sensible floor for very narrow terminals.
		inputWidth := msg.Width - (padding * 2) - 4
		if inputWidth < 20 {
			inputWidth = 20
		}
		for _, f := range []*FormStep{
			&m.loginForm, &m.wireguardForm, &m.appForm,
			&m.serverForm, &m.dbForm, &m.certForm,
		} {
			f.SetWidth(inputWidth)
		}
	case spinner.TickMsg:
		var cmd tea.Cmd
		m.spinner, cmd = m.spinner.Update(msg)
		return m, cmd
	}

	switch m.currentStep {
	case StepCheckDocker:
		return m.updateCheckDocker(msg)
	case StepDockerInstall:
		return m.updateDockerInstall(msg)
	case StepDockerLogin:
		done, cmd := m.loginForm.Update(msg)

		if done {
			m.configValues.Login = m.loginForm.Values()
			m.advance(StepDownloadImage)

			return m, DownloadImageCmd(imageName, m.configValues.Login["user"], m.configValues.Login["password"])
		}

		return m, cmd
	case StepDownloadImage:
		return m.updateDownloadImage(msg)

	// Ip & Wireguard
	case StepIPQuestion:
		return m.updateIPQuestion(msg)
	case StepWireguardConfig:
		done, cmd := m.wireguardForm.Update(msg)

		if done {
			m.configValues.Wireguard = m.wireguardForm.Values()

			m.downloadDone = false
			m.downloadMessage = ""
			m.downloadError = nil
			m.advance(StepGenerateWireguardFile)

			return m, GenerateWireguardConfigFile(m.configValues, wireguardConfigPath)
		}

		return m, cmd
	case StepGenerateWireguardFile:
		return m.updateGenerateWireguardFile(msg)
	case StepDownloadWireguard:
		return m.updateDownloadWireguard(msg)
	case StepRunWireguard:
		return m.updateRunWireguardDocker(msg)

	case StepAppConfig:
		done, cmd := m.appForm.Update(msg)

		if done {
			m.configValues.Application = m.appForm.Values()
			m.advance(StepServerConfig)
		}

		return m, cmd
	case StepServerConfig:
		done, cmd := m.serverForm.Update(msg)

		if done {
			m.configValues.Server = m.serverForm.Values()
			m.advance(StepDatabaseConfig)
		}

		return m, cmd
	case StepDatabaseConfig:
		done, cmd := m.dbForm.Update(msg)

		if done {
			m.configValues.Database = m.dbForm.Values()
			m.advance(StepCertConfig)
		}

		return m, cmd
	case StepCertConfig:
		done, cmd := m.certForm.Update(msg)

		if done {
			m.configValues.Cert = m.certForm.Values()
			m.advance(StepReview)
		}

		return m, cmd
	case StepReview:
		return m.updateReview(msg)
	case StepGenerateFile:
		return m.updateGenerateFile(msg)
	case StepRunDocker:
		return m.updateRunDocker(msg)
	case StepRunUpdater:
		return m.updateRunUpdater(msg)
	case StepDone:
		return m, tea.Quit
	}

	return m, nil
}

func (m Model) updateCheckDocker(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case DockerCheckedMsg:
		m.dockerInstalled = msg.Installed
		m.checkDockerDone = true
	case TickMsg:
		if m.checkProgress < 1.0 {
			m.checkProgress += 0.2 + (rand.Float64()*0.2 - 0.2)
			if m.checkProgress > 1.0 {
				m.checkProgress = 1.0
			}
			return m, TickCmd()
		}
	case tea.KeyPressMsg:
		if m.checkDockerDone && m.checkProgress == 1 {
			if m.dockerInstalled {
				m.loading = true
				m.advance(StepDockerLogin)
			} else {
				m.advance(StepDockerInstall)
			}
		}
	}

	return m, nil
}

func (m Model) updateDockerInstall(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg.(type) {
	case tea.KeyPressMsg:
		return m, tea.Quit
	}

	return m, nil
}

func (m Model) updateDownloadImage(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case ImageDownloadFinishedMsg:
		m.downloadDone = true
		m.downloadMessage = msg.Message
		m.downloadError = msg.Err
		return m, nil

	case tea.KeyPressMsg:
		if m.downloadDone && m.downloadError == nil {
			m.advance(StepIPQuestion)
		} else if m.downloadDone {
			switch msg.String() {
			case "r":
				m.downloadDone = false
				m.downloadMessage = ""
				m.downloadError = nil
				return m, DownloadImageCmd(imageName, m.configValues.Login["user"], m.configValues.Login["password"])
			default:
				return m, tea.Quit
			}
		}
	}

	return m, nil
}

func (m Model) updateIPQuestion(msg tea.Msg) (tea.Model, tea.Cmd) {
	numOptions := 2

	switch msg := msg.(type) {
	case tea.KeyPressMsg:
		switch msg.String() {
		case "up", "k":
			if m.cursor > 0 {
				m.cursor--
			}
		case "down", "j":
			if m.cursor < numOptions-1 {
				m.cursor++
			}
		case "enter":
			// Yes
			if m.cursor == 0 {
				m.advance(StepAppConfig)
				return m, nil
			}

			m.advance(StepWireguardConfig)
		}
	}

	return m, nil
}

func (m Model) updateDownloadWireguard(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case ImageDownloadFinishedMsg:
		m.downloadDone = true
		m.downloadMessage = msg.Message
		m.downloadError = msg.Err

		if m.downloadError == nil {
			m.currentStep = StepRunWireguard

			return m, RunWireguardContainer(wireguardConfigPath, m.configValues)
		}

	case tea.KeyPressMsg:
		if m.downloadDone && m.downloadError == nil {
			m.currentStep = StepRunWireguard
		} else if m.downloadDone {
			switch msg.String() {
			case "r":
				m.downloadDone = false
				m.downloadMessage = ""
				m.downloadError = nil
				return m, DownloadImageCmd(wireguardImageName, m.configValues.Login["user"], m.configValues.Login["password"])
			default:
				return m, tea.Quit
			}
		}
	}

	return m, nil
}

func (m Model) updateGenerateWireguardFile(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case ConfigFileMsg:
		m.finishedFile = true
		m.configFileError = msg.Err

		if msg.Err == nil {
			m.currentStep = StepDownloadWireguard

			return m, DownloadImageCmd(wireguardImageName, m.configValues.Login["user"], m.configValues.Login["password"])
		}

	case tea.KeyPressMsg:
		if m.finishedFile && m.configFileError != nil {
			// Validation error (e.g. MTU): go back to the form to correct it. The form
			// is the top of the history stack, so goBack lands on it without leaving a
			// duplicate entry; fall back to a direct set if history is unexpectedly empty.
			if !m.goBack() {
				m.currentStep = StepWireguardConfig
			}
		} else if m.finishedFile && m.configFileError == nil {
			m.currentStep = StepDownloadWireguard

			return m, DownloadImageCmd(wireguardImageName, m.configValues.Login["user"], m.configValues.Login["password"])
		}
	}

	return m, nil
}

func (m Model) updateRunWireguardDocker(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case DockerRunMsg:
		m.finishedDockerRun = true
		m.dockerRunError = msg.Err

	case tea.KeyPressMsg:
		if m.finishedDockerRun && m.dockerRunError != nil {
			switch msg.String() {
			case "r":
				m.finishedDockerRun = false
				m.dockerRunError = nil
				return m, RunWireguardContainer(wireguardConfigPath, m.configValues)
			default:
				return m, tea.Quit
			}
		} else if m.finishedDockerRun && m.dockerRunError == nil {
			m.advance(StepAppConfig)
		}
	}

	return m, nil
}

// updateReview shows the collected configuration for confirmation before any files are
// written. Enter confirms and generates config.toml; Esc (handled globally) goes back
// to the previous form to edit.
func (m Model) updateReview(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case tea.KeyPressMsg:
		switch msg.String() {
		case "enter":
			m.advance(StepGenerateFile)

			m.finishedFile = false
			m.configFileError = nil

			return m, GenerateConfigFile(m.configValues, configPath)
		}
	}

	return m, nil
}

func (m Model) updateGenerateFile(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case ConfigFileMsg:
		m.finishedFile = true
		m.configFileError = msg.Err

	case tea.KeyPressMsg:
		if m.finishedFile && m.configFileError != nil {
			// Validation error: return to the review (top of the stack) so the user can
			// navigate back to the forms; direct set as a fallback.
			if !m.goBack() {
				m.currentStep = StepReview
			}
		} else if m.finishedFile && m.configFileError == nil {
			m.currentStep = StepRunDocker

			m.finishedDockerRun = false
			m.dockerRunError = nil

			return m, RunAppContainer(
				imageName,
				"app-dono-cliente",
				configPath,
				fmt.Sprintf("/app/%s", configPath),
				m.configValues,
			)
		}
	}

	return m, nil
}

func (m Model) updateRunDocker(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case DockerRunMsg:
		m.finishedDockerRun = true
		m.dockerRunError = msg.Err

	case tea.KeyPressMsg:
		if m.finishedDockerRun && m.dockerRunError != nil {
			switch msg.String() {
			case "r":
				m.finishedDockerRun = false
				m.dockerRunError = nil
				return m, RunAppContainer(
					imageName,
					"app-dono-cliente",
					configPath,
					fmt.Sprintf("/app/%s", configPath),
					m.configValues,
				)
			default:
				return m, tea.Quit
			}
		} else if m.finishedDockerRun && m.dockerRunError == nil {
			m.currentStep = StepRunUpdater

			m.finishedDockerRun = false
			m.dockerRunError = nil

			return m, RunUpdaterContainer(
				imageName,
				"app-dono-cliente",
				configPath,
				fmt.Sprintf("/app/%s", configPath),
				m.configValues,
			)
		}
	}

	return m, nil
}

// updateRunUpdater starts the auto-update agent that watches the app-dono-cliente
// container and pulls/recreates it whenever a new image is pushed to :latest.
func (m Model) updateRunUpdater(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case DockerRunMsg:
		m.finishedDockerRun = true
		m.dockerRunError = msg.Err

	case tea.KeyPressMsg:
		if m.finishedDockerRun && m.dockerRunError != nil {
			switch msg.String() {
			case "r":
				m.finishedDockerRun = false
				m.dockerRunError = nil
				return m, RunUpdaterContainer(
					imageName,
					"app-dono-cliente",
					configPath,
					fmt.Sprintf("/app/%s", configPath),
					m.configValues,
				)
			default:
				return m, tea.Quit
			}
		} else if m.finishedDockerRun && m.dockerRunError == nil {
			m.currentStep = StepDone
		}
	}

	return m, nil
}