package main

import (
	"fmt"
	"strings"

	"github.com/bdw/ship/internal/output"
	"github.com/bdw/ship/internal/ssh"
	"github.com/bdw/ship/internal/state"
	"github.com/bdw/ship/internal/templates"
	"github.com/spf13/cobra"
)

func initHostV2() {
	hostInitV2Cmd.Flags().String("domain", "", "Base domain for deployments (required)")
	hostInitV2Cmd.MarkFlagRequired("domain")
	
	hostV2Cmd.AddCommand(hostInitV2Cmd)
	hostV2Cmd.AddCommand(hostStatusV2Cmd)
}

var hostInitV2Cmd = &cobra.Command{
	Use:   "init USER@HOST --domain DOMAIN",
	Short: "Initialize a VPS for deployments",
	Long: `Set up a fresh VPS with Caddy, Docker, and required directories.

Example:
  ship host init user@my-vps --domain example.com`,
	Args: cobra.ExactArgs(1),
	RunE: runHostInitV2,
}

func runHostInitV2(cmd *cobra.Command, args []string) error {
	host := args[0]
	domain, _ := cmd.Flags().GetString("domain")

	if domain == "" {
		output.PrintAndExit(output.Err(output.ErrInvalidArgs, "--domain is required"))
	}

	// Connect
	client, err := ssh.Connect(host)
	if err != nil {
		output.PrintAndExit(output.Err(output.ErrSSHConnectFailed, err.Error()))
	}
	defer client.Close()

	// Detect OS
	osRelease, err := client.Run("cat /etc/os-release")
	if err != nil {
		output.PrintAndExit(output.Err(output.ErrSSHConnectFailed, "failed to detect OS: "+err.Error()))
	}

	if !strings.Contains(osRelease, "Ubuntu") && !strings.Contains(osRelease, "Debian") {
		output.PrintAndExit(output.Err(output.ErrInvalidArgs, "unsupported OS (only Ubuntu and Debian are supported)"))
	}

	var installed []string

	// Install Caddy if needed
	if _, err := client.Run("which caddy"); err != nil {
		if err := installCaddyV2(client); err != nil {
			output.PrintAndExit(output.Err(output.ErrServiceFailed, "failed to install Caddy: "+err.Error()))
		}
		installed = append(installed, "caddy")
	}

	// Configure Caddy
	caddyfile := `{
}

import /etc/caddy/sites-enabled/*
`
	if err := client.WriteSudoFile("/etc/caddy/Caddyfile", caddyfile); err != nil {
		output.PrintAndExit(output.Err(output.ErrCaddyFailed, "failed to write Caddyfile: "+err.Error()))
	}

	// Create directories
	dirs := []string{
		"/etc/ship/env",
		"/etc/ship/ports",
		"/etc/ship/ttl",
		"/etc/caddy/sites-enabled",
		"/var/www",
	}
	for _, dir := range dirs {
		if _, err := client.RunSudo(fmt.Sprintf("mkdir -p %s", dir)); err != nil {
			output.PrintAndExit(output.Err(output.ErrServiceFailed, "failed to create directory: "+err.Error()))
		}
	}

	// Install Docker
	if _, err := client.Run("which docker"); err != nil {
		if err := installDockerV2(client); err != nil {
			output.PrintAndExit(output.Err(output.ErrServiceFailed, "failed to install Docker: "+err.Error()))
		}
		installed = append(installed, "docker")
	}

	// Install cleanup timer for TTL
	if err := installCleanupTimer(client); err != nil {
		// Non-fatal
	}

	// Enable and start services
	if _, err := client.RunSudo("systemctl enable --now caddy docker"); err != nil {
		output.PrintAndExit(output.Err(output.ErrServiceFailed, "failed to enable services: "+err.Error()))
	}

	// Save state
	st, err := state.Load()
	if err != nil {
		output.PrintAndExit(output.Err(output.ErrServiceFailed, "failed to load state: "+err.Error()))
	}

	hostState := st.GetHost(host)
	hostState.BaseDomain = domain

	if st.GetDefaultHost() == "" {
		st.SetDefaultHost(host)
	}

	if err := st.Save(); err != nil {
		output.PrintAndExit(output.Err(output.ErrServiceFailed, "failed to save state: "+err.Error()))
	}

	// Success
	output.PrintAndExit(&output.HostInitResponse{
		Status:    "ok",
		Host:      host,
		Domain:    domain,
		Installed: installed,
	})

	return nil
}

func installCaddyV2(client *ssh.Client) error {
	commands := []string{
		"apt-get update",
		"apt-get install -y debian-keyring debian-archive-keyring apt-transport-https curl gnupg",
		"curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/gpg.key' -o /tmp/caddy.gpg",
		"gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg < /tmp/caddy.gpg",
		"curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/debian.deb.txt' -o /etc/apt/sources.list.d/caddy-stable.list",
		"apt-get update",
		"apt-get install -y caddy",
	}

	for _, cmd := range commands {
		if _, err := client.RunSudo(cmd); err != nil {
			return fmt.Errorf("command failed: %s: %w", cmd, err)
		}
	}
	return nil
}

func installDockerV2(client *ssh.Client) error {
	commands := []string{
		"apt-get install -y ca-certificates curl gnupg",
		"install -m 0755 -d /etc/apt/keyrings",
		"curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc",
		"chmod a+r /etc/apt/keyrings/docker.asc",
		`sh -c 'echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu $(. /etc/os-release && echo ${VERSION_CODENAME}) stable" > /etc/apt/sources.list.d/docker.list'`,
		"apt-get update",
		"apt-get install -y docker-ce docker-ce-cli containerd.io",
	}

	for _, cmd := range commands {
		if _, err := client.RunSudo(cmd); err != nil {
			return fmt.Errorf("command failed: %s: %w", cmd, err)
		}
	}
	return nil
}

func installCleanupTimer(client *ssh.Client) error {
	// Cleanup script
	script := `#!/bin/bash
now=$(date +%s)
for f in /etc/ship/ttl/*; do
    [ -f "$f" ] || continue
    name=$(basename "$f")
    expires=$(cat "$f")
    if [ "$now" -gt "$expires" ]; then
        systemctl stop "$name" 2>/dev/null || true
        systemctl disable "$name" 2>/dev/null || true
        rm -f "/etc/systemd/system/${name}.service"
        rm -f "/etc/caddy/sites-enabled/${name}.caddy"
        rm -rf "/var/www/${name}"
        rm -rf "/var/lib/${name}"
        rm -f "/usr/local/bin/${name}"
        rm -f "/etc/ship/env/${name}.env"
        rm -f "/etc/ship/ports/${name}"
        rm -f "/etc/ship/ttl/${name}"
        docker rm -f "$name" 2>/dev/null || true
        docker rmi "$name" 2>/dev/null || true
    fi
done
systemctl daemon-reload
systemctl reload caddy
`
	if err := client.WriteSudoFile("/usr/local/bin/ship-cleanup", script); err != nil {
		return err
	}
	if _, err := client.RunSudo("chmod +x /usr/local/bin/ship-cleanup"); err != nil {
		return err
	}

	// Timer unit
	timer := `[Unit]
Description=Ship TTL cleanup timer

[Timer]
OnCalendar=hourly
Persistent=true

[Install]
WantedBy=timers.target
`
	if err := client.WriteSudoFile("/etc/systemd/system/ship-cleanup.timer", timer); err != nil {
		return err
	}

	// Service unit
	service := `[Unit]
Description=Ship TTL cleanup

[Service]
Type=oneshot
ExecStart=/usr/local/bin/ship-cleanup
`
	if err := client.WriteSudoFile("/etc/systemd/system/ship-cleanup.service", service); err != nil {
		return err
	}

	// Enable timer
	if _, err := client.RunSudo("systemctl daemon-reload"); err != nil {
		return err
	}
	if _, err := client.RunSudo("systemctl enable --now ship-cleanup.timer"); err != nil {
		return err
	}

	return nil
}

var hostStatusV2Cmd = &cobra.Command{
	Use:   "status",
	Short: "Check host status",
	RunE: func(cmd *cobra.Command, args []string) error {
		st, err := state.Load()
		if err != nil {
			output.PrintAndExit(output.Err(output.ErrHostNotConfigured, err.Error()))
		}

		hostName := hostFlag
		if hostName == "" {
			hostName = st.DefaultHost
		}
		if hostName == "" {
			output.PrintAndExit(output.Err(output.ErrHostNotConfigured, "no host specified"))
		}

		hostConfig := st.GetHost(hostName)

		client, err := ssh.Connect(hostName)
		if err != nil {
			output.PrintAndExit(output.Err(output.ErrSSHConnectFailed, err.Error()))
		}
		defer client.Close()

		// Check services
		caddyStatus, _ := client.RunSudo("systemctl is-active caddy")
		dockerStatus, _ := client.RunSudo("systemctl is-active docker")

		// Print as JSON directly (custom response type)
		fmt.Printf(`{"status":"ok","host":%q,"domain":%q,"caddy":%t,"docker":%t}`+"\n",
			hostName,
			hostConfig.BaseDomain,
			strings.TrimSpace(caddyStatus) == "active",
			strings.TrimSpace(dockerStatus) == "active",
		)
		return nil
	},
}

// Preserve git setup functionality from v1 for advanced users
func setupGitDeployV2(client *ssh.Client, baseDomain string, hostState *state.Host) *output.ErrorResponse {
	// Install git, fcgiwrap, cgit
	if _, err := client.RunSudo("apt-get install -y git fcgiwrap cgit"); err != nil {
		return output.Err(output.ErrServiceFailed, "failed to install git tools: "+err.Error())
	}

	// Create git user
	client.RunSudo("useradd -r -m -d /home/git -s $(which git-shell) git")
	client.RunSudo("usermod -aG docker git")
	client.RunSudo("usermod -aG git www-data")
	client.RunSudo("usermod -aG www-data caddy")

	// Copy SSH keys
	copyKeysCommands := []string{
		"mkdir -p /home/git/.ssh",
		"cp ~/.ssh/authorized_keys /home/git/.ssh/authorized_keys",
		"chown -R git:git /home/git/.ssh",
		"chmod 700 /home/git/.ssh",
		"chmod 600 /home/git/.ssh/authorized_keys",
	}
	for _, cmd := range copyKeysCommands {
		if _, err := client.RunSudo(cmd); err != nil {
			return output.Err(output.ErrServiceFailed, "failed to setup git SSH: "+err.Error())
		}
	}

	// Create /srv/git
	client.RunSudo("mkdir -p /srv/git")
	client.RunSudo("chown git:git /srv/git")

	// Sudoers
	sudoersContent := `git ALL=(ALL) NOPASSWD: \
    /bin/systemctl daemon-reload, \
    /bin/systemctl reload caddy, \
    /bin/systemctl restart [a-z]*, \
    /bin/systemctl enable [a-z]*, \
    /bin/cp /var/lib/*/src/.ship/service /etc/systemd/system/*.service, \
    /bin/cp /var/lib/*/src/.ship/Caddyfile /etc/caddy/sites-enabled/*.caddy, \
    /bin/cp /var/www/*/.ship/Caddyfile /etc/caddy/sites-enabled/*.caddy, \
    /bin/mkdir -p /var/lib/*, \
    /bin/mkdir -p /var/www/*, \
    /bin/chown -R git\:git /var/lib/*, \
    /bin/chown git\:git /var/www/*
`
	if err := client.WriteSudoFile("/etc/sudoers.d/ship-git", sudoersContent); err != nil {
		return output.Err(output.ErrServiceFailed, "failed to write sudoers: "+err.Error())
	}
	client.RunSudo("chmod 440 /etc/sudoers.d/ship-git")

	// Vanity import template
	vanityHTML := `<!DOCTYPE html>
<html><head>
{{$path := trimPrefix "/" (placeholder "http.request.orig_uri.path")}}
{{$parts := splitList "/" $path}}
{{$module := first $parts}}
<meta name="go-import" content="{{.Host}}/{{$module}} git https://{{.Host}}/{{$module}}.git">
</head>
<body>go get {{.Host}}/{{$module}}</body>
</html>
`
	client.RunSudo("mkdir -p /opt/ship/vanity")
	client.WriteSudoFile("/opt/ship/vanity/index.html", vanityHTML)

	// cgit config
	codeCaddyContent, _ := templates.CodeCaddy(map[string]string{"BaseDomain": baseDomain})
	client.WriteSudoFile("/etc/caddy/sites-enabled/ship-code.caddy", codeCaddyContent)

	cgitrcContent, _ := templates.CgitRC(map[string]string{"BaseDomain": baseDomain})
	client.WriteSudoFile("/etc/cgitrc", cgitrcContent)
	client.WriteSudoFile("/opt/ship/cgit-header.html", templates.CgitHeader())

	// Start services
	client.RunSudo("systemctl enable --now fcgiwrap")
	client.RunSudo("systemctl restart caddy")

	hostState.GitSetup = true
	return nil
}