package main

import (
	"fmt"
	"net/http"
	"strconv"
	"strings"
	"time"

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

// deployStaticV2 deploys a static site
// 1. rsync path to /var/www/<name>/
// 2. Generate and upload Caddyfile
// 3. Reload Caddy
func deployStaticV2(ctx *deployContext) *output.ErrorResponse {
	client, err := ssh.Connect(ctx.SSHHost)
	if err != nil {
		return output.Err(output.ErrSSHConnectFailed, err.Error())
	}
	defer client.Close()

	name := ctx.Name
	remotePath := fmt.Sprintf("/var/www/%s", name)

	// Create directory and set ownership for upload
	user, _ := client.Run("whoami")
	user = strings.TrimSpace(user)
	if _, err := client.RunSudo(fmt.Sprintf("mkdir -p %s", remotePath)); err != nil {
		return output.Err(output.ErrUploadFailed, "failed to create directory: "+err.Error())
	}
	if _, err := client.RunSudo(fmt.Sprintf("chown -R %s:%s %s", user, user, remotePath)); err != nil {
		return output.Err(output.ErrUploadFailed, "failed to set directory ownership: "+err.Error())
	}

	// Upload files using rsync
	if err := client.UploadDir(ctx.Path, remotePath); err != nil {
		return output.Err(output.ErrUploadFailed, err.Error())
	}

	// Set ownership back to www-data
	if _, err := client.RunSudo(fmt.Sprintf("chown -R www-data:www-data %s", remotePath)); err != nil {
		// Non-fatal, continue
	}

	// Generate Caddyfile
	caddyfile, err := templates.StaticCaddy(map[string]string{
		"Domain":  ctx.URL[8:], // Strip https://
		"RootDir": remotePath,
		"Name":    name,
	})
	if err != nil {
		return output.Err(output.ErrCaddyFailed, "failed to generate Caddyfile: "+err.Error())
	}

	// Upload Caddyfile
	caddyPath := fmt.Sprintf("/etc/caddy/sites-enabled/%s.caddy", name)
	if err := client.WriteSudoFile(caddyPath, caddyfile); err != nil {
		return output.Err(output.ErrCaddyFailed, "failed to write Caddyfile: "+err.Error())
	}

	// Reload Caddy
	if _, err := client.RunSudo("systemctl reload caddy"); err != nil {
		return output.Err(output.ErrCaddyFailed, "failed to reload Caddy: "+err.Error())
	}

	return nil
}

// deployDockerV2 deploys a Docker-based app
// 1. Allocate port
// 2. rsync path to /var/lib/<name>/src/
// 3. docker build
// 4. Generate systemd unit and env file
// 5. Generate Caddyfile
// 6. Start service, reload Caddy
func deployDockerV2(ctx *deployContext) *output.ErrorResponse {
	client, err := ssh.Connect(ctx.SSHHost)
	if err != nil {
		return output.Err(output.ErrSSHConnectFailed, err.Error())
	}
	defer client.Close()

	name := ctx.Name

	// Allocate port on server
	port, err := allocatePort(client, name)
	if err != nil {
		return output.Err(output.ErrServiceFailed, "failed to allocate port: "+err.Error())
	}

	srcPath := fmt.Sprintf("/var/lib/%s/src", name)
	dataPath := fmt.Sprintf("/var/lib/%s/data", name)

	// Create directories
	if _, err := client.RunSudo(fmt.Sprintf("mkdir -p %s %s", srcPath, dataPath)); err != nil {
		return output.Err(output.ErrUploadFailed, "failed to create directories: "+err.Error())
	}

	// Upload source
	if err := client.UploadDir(ctx.Path, srcPath); err != nil {
		return output.Err(output.ErrUploadFailed, err.Error())
	}

	// Docker build
	buildCmd := fmt.Sprintf("docker build -t %s:latest %s", name, srcPath)
	if _, err := client.RunSudo(buildCmd); err != nil {
		return output.Err(output.ErrBuildFailed, err.Error())
	}

	// Generate and write env file
	envContent := fmt.Sprintf("PORT=%d\nSHIP_NAME=%s\nSHIP_URL=%s\n", port, name, ctx.URL)
	for _, e := range ctx.Opts.Env {
		envContent += e + "\n"
	}
	envPath := fmt.Sprintf("/etc/ship/env/%s.env", name)
	if _, err := client.RunSudo("mkdir -p /etc/ship/env"); err != nil {
		// Continue, directory might exist
	}
	if err := client.WriteSudoFile(envPath, envContent); err != nil {
		return output.Err(output.ErrServiceFailed, "failed to write env file: "+err.Error())
	}

	// Generate systemd unit
	service, err := templates.DockerService(map[string]string{
		"Name": name,
		"Port": strconv.Itoa(port),
	})
	if err != nil {
		return output.Err(output.ErrServiceFailed, "failed to generate systemd unit: "+err.Error())
	}

	servicePath := fmt.Sprintf("/etc/systemd/system/%s.service", name)
	if err := client.WriteSudoFile(servicePath, service); err != nil {
		return output.Err(output.ErrServiceFailed, "failed to write systemd unit: "+err.Error())
	}

	// Generate Caddyfile
	caddyfile, err := templates.AppCaddy(map[string]string{
		"Domain": ctx.URL[8:], // Strip https://
		"Port":   strconv.Itoa(port),
	})
	if err != nil {
		return output.Err(output.ErrCaddyFailed, "failed to generate Caddyfile: "+err.Error())
	}

	caddyPath := fmt.Sprintf("/etc/caddy/sites-enabled/%s.caddy", name)
	if err := client.WriteSudoFile(caddyPath, caddyfile); err != nil {
		return output.Err(output.ErrCaddyFailed, "failed to write Caddyfile: "+err.Error())
	}

	// Reload systemd and start service
	if _, err := client.RunSudo("systemctl daemon-reload"); err != nil {
		return output.Err(output.ErrServiceFailed, "failed to reload systemd: "+err.Error())
	}
	if _, err := client.RunSudo(fmt.Sprintf("systemctl restart %s", name)); err != nil {
		return output.Err(output.ErrServiceFailed, "failed to start service: "+err.Error())
	}

	// Reload Caddy
	if _, err := client.RunSudo("systemctl reload caddy"); err != nil {
		return output.Err(output.ErrCaddyFailed, "failed to reload Caddy: "+err.Error())
	}

	return nil
}

// deployBinaryV2 deploys a pre-built binary
// 1. Allocate port
// 2. scp binary to /usr/local/bin/<name>
// 3. Create user for service
// 4. Generate systemd unit and env file
// 5. Generate Caddyfile
// 6. Start service, reload Caddy
func deployBinaryV2(ctx *deployContext) *output.ErrorResponse {
	client, err := ssh.Connect(ctx.SSHHost)
	if err != nil {
		return output.Err(output.ErrSSHConnectFailed, err.Error())
	}
	defer client.Close()

	name := ctx.Name

	// Allocate port on server
	port, err := allocatePort(client, name)
	if err != nil {
		return output.Err(output.ErrServiceFailed, "failed to allocate port: "+err.Error())
	}

	binaryPath := fmt.Sprintf("/usr/local/bin/%s", name)
	workDir := fmt.Sprintf("/var/lib/%s", name)

	// Upload binary
	if err := client.Upload(ctx.Path, "/tmp/"+name); err != nil {
		return output.Err(output.ErrUploadFailed, err.Error())
	}

	// Move to final location and set permissions
	if _, err := client.RunSudo(fmt.Sprintf("mv /tmp/%s %s && chmod +x %s", name, binaryPath, binaryPath)); err != nil {
		return output.Err(output.ErrUploadFailed, "failed to install binary: "+err.Error())
	}

	// Create work directory
	if _, err := client.RunSudo(fmt.Sprintf("mkdir -p %s", workDir)); err != nil {
		return output.Err(output.ErrServiceFailed, "failed to create work directory: "+err.Error())
	}

	// Create service user (ignore error if exists)
	client.RunSudo(fmt.Sprintf("useradd -r -s /bin/false %s 2>/dev/null || true", name))
	client.RunSudo(fmt.Sprintf("chown -R %s:%s %s", name, name, workDir))

	// Generate and write env file
	envContent := fmt.Sprintf("PORT=%d\nSHIP_NAME=%s\nSHIP_URL=%s\n", port, name, ctx.URL)
	for _, e := range ctx.Opts.Env {
		envContent += e + "\n"
	}
	envPath := fmt.Sprintf("/etc/ship/env/%s.env", name)
	if _, err := client.RunSudo("mkdir -p /etc/ship/env"); err != nil {
		// Continue
	}
	if err := client.WriteSudoFile(envPath, envContent); err != nil {
		return output.Err(output.ErrServiceFailed, "failed to write env file: "+err.Error())
	}

	// Generate systemd unit
	service, err := templates.SystemdService(map[string]string{
		"Name":       name,
		"User":       name,
		"WorkDir":    workDir,
		"EnvFile":    envPath,
		"BinaryPath": binaryPath,
		"Args":       "",
	})
	if err != nil {
		return output.Err(output.ErrServiceFailed, "failed to generate systemd unit: "+err.Error())
	}

	servicePath := fmt.Sprintf("/etc/systemd/system/%s.service", name)
	if err := client.WriteSudoFile(servicePath, service); err != nil {
		return output.Err(output.ErrServiceFailed, "failed to write systemd unit: "+err.Error())
	}

	// Generate Caddyfile
	caddyfile, err := templates.AppCaddy(map[string]string{
		"Domain": ctx.URL[8:], // Strip https://
		"Port":   strconv.Itoa(port),
	})
	if err != nil {
		return output.Err(output.ErrCaddyFailed, "failed to generate Caddyfile: "+err.Error())
	}

	caddyPath := fmt.Sprintf("/etc/caddy/sites-enabled/%s.caddy", name)
	if err := client.WriteSudoFile(caddyPath, caddyfile); err != nil {
		return output.Err(output.ErrCaddyFailed, "failed to write Caddyfile: "+err.Error())
	}

	// Reload systemd and start service
	if _, err := client.RunSudo("systemctl daemon-reload"); err != nil {
		return output.Err(output.ErrServiceFailed, "failed to reload systemd: "+err.Error())
	}
	if _, err := client.RunSudo(fmt.Sprintf("systemctl enable --now %s", name)); err != nil {
		return output.Err(output.ErrServiceFailed, "failed to start service: "+err.Error())
	}

	// Reload Caddy
	if _, err := client.RunSudo("systemctl reload caddy"); err != nil {
		return output.Err(output.ErrCaddyFailed, "failed to reload Caddy: "+err.Error())
	}

	return nil
}

// allocatePort allocates or retrieves a port for a service
func allocatePort(client *ssh.Client, name string) (int, error) {
	portFile := fmt.Sprintf("/etc/ship/ports/%s", name)

	// Try to read existing port
	out, err := client.Run(fmt.Sprintf("cat %s 2>/dev/null || echo ''", portFile))
	if err == nil && out != "" {
		port, err := strconv.Atoi(out[:len(out)-1]) // Strip newline
		if err == nil && port > 0 {
			return port, nil
		}
	}

	// Allocate new port
	// Find highest used port and increment
	out, err = client.RunSudo("mkdir -p /etc/ship/ports && ls /etc/ship/ports/ 2>/dev/null | xargs -I{} cat /etc/ship/ports/{} 2>/dev/null | sort -n | tail -1")
	if err != nil {
		out = ""
	}

	nextPort := 9000
	if out != "" {
		if lastPort, err := strconv.Atoi(out[:len(out)-1]); err == nil {
			nextPort = lastPort + 1
		}
	}

	// Write port allocation
	if err := client.WriteSudoFile(portFile, strconv.Itoa(nextPort)); err != nil {
		return 0, err
	}

	return nextPort, nil
}

// setTTLV2 sets auto-expiry for a deploy
func setTTLV2(ctx *deployContext, ttl time.Duration) error {
	client, err := ssh.Connect(ctx.SSHHost)
	if err != nil {
		return err
	}
	defer client.Close()

	expires := time.Now().Add(ttl).Unix()
	ttlPath := fmt.Sprintf("/etc/ship/ttl/%s", ctx.Name)

	if _, err := client.RunSudo("mkdir -p /etc/ship/ttl"); err != nil {
		return err
	}

	return client.WriteSudoFile(ttlPath, strconv.FormatInt(expires, 10))
}

// runHealthCheck verifies the deploy is responding
func runHealthCheck(url, endpoint string) (*output.HealthResult, *output.ErrorResponse) {
	fullURL := url + endpoint

	// Wait for app to start
	time.Sleep(2 * time.Second)

	var lastErr error
	var lastStatus int

	for i := 0; i < 15; i++ {
		start := time.Now()
		resp, err := http.Get(fullURL)
		latency := time.Since(start).Milliseconds()

		if err != nil {
			lastErr = err
			time.Sleep(2 * time.Second)
			continue
		}
		resp.Body.Close()
		lastStatus = resp.StatusCode

		if resp.StatusCode >= 200 && resp.StatusCode < 400 {
			return &output.HealthResult{
				Endpoint:  endpoint,
				Status:    resp.StatusCode,
				LatencyMs: latency,
			}, nil
		}

		time.Sleep(2 * time.Second)
	}

	msg := fmt.Sprintf("health check failed after 30s: ")
	if lastErr != nil {
		msg += lastErr.Error()
	} else {
		msg += fmt.Sprintf("status %d", lastStatus)
	}

	return nil, output.Err(output.ErrHealthCheckFailed, msg)
}