package main

import (
	"crypto/rand"
	"encoding/hex"
	"fmt"
	"regexp"
	"strings"
	"time"

	"github.com/bdw/ship/internal/detect"
	"github.com/bdw/ship/internal/output"
	"github.com/bdw/ship/internal/state"
)

// deployV2 implements the new agent-first deploy interface.
// Usage: ship [PATH] [FLAGS]
// PATH defaults to "." if not provided.
func deployV2(path string, opts deployV2Options) {
	start := time.Now()

	// Validate name if provided
	if opts.Name != "" {
		if err := validateNameV2(opts.Name); err != nil {
			output.PrintAndExit(err)
		}
	}

	// Parse TTL if provided
	var ttlDuration time.Duration
	if opts.TTL != "" {
		var err error
		ttlDuration, err = parseTTL(opts.TTL)
		if err != nil {
			output.PrintAndExit(output.Err(output.ErrInvalidTTL, err.Error()))
		}
	}

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

	hostName := opts.Host
	if hostName == "" {
		hostName = st.DefaultHost
	}
	if hostName == "" {
		output.PrintAndExit(output.Err(output.ErrHostNotConfigured, "no host specified and no default host configured. Run: ship host init"))
	}

	hostConfig := st.GetHost(hostName)
	if hostConfig.BaseDomain == "" {
		output.PrintAndExit(output.Err(output.ErrHostNotConfigured, fmt.Sprintf("host %q has no base domain configured. Run: ship host init", hostName)))
	}

	// Auto-detect project type
	result := detect.Detect(path)
	if result.Error != nil {
		output.PrintAndExit(result.Error)
	}

	// Generate name if not provided
	name := opts.Name
	if name == "" {
		name = generateName()
	}

	// Build URL: use custom domain if provided, otherwise use subdomain
	var url string
	if opts.Domain != "" {
		url = fmt.Sprintf("https://%s", opts.Domain)
	} else {
		url = fmt.Sprintf("https://%s.%s", name, hostConfig.BaseDomain)
	}

	// Build deploy context
	ctx := &deployContext{
		SSHHost:    hostName,
		HostConfig: hostConfig,
		Name:       name,
		Path:       result.Path,
		URL:        url,
		Opts:       opts,
	}

	// Deploy based on type
	var deployErr *output.ErrorResponse
	switch result.Type {
	case detect.TypeStatic:
		deployErr = deployStaticV2(ctx)
	case detect.TypeDocker:
		deployErr = deployDockerV2(ctx)
	case detect.TypeBinary:
		deployErr = deployBinaryV2(ctx)
	}

	if deployErr != nil {
		deployErr.Name = name
		deployErr.URL = url
		output.PrintAndExit(deployErr)
	}

	// Set TTL if specified
	if ttlDuration > 0 {
		if err := setTTLV2(ctx, ttlDuration); err != nil {
			// Non-fatal, deploy succeeded
			// TODO: log warning
		}
	}

	// Health check
	var healthResult *output.HealthResult
	if opts.Health != "" || result.Type == detect.TypeStatic {
		endpoint := opts.Health
		if endpoint == "" {
			endpoint = "/"
		}
		healthResult, deployErr = runHealthCheck(url, endpoint)
		if deployErr != nil {
			deployErr.Name = name
			deployErr.URL = url
			output.PrintAndExit(deployErr)
		}
	}

	// Build response
	resp := &output.DeployResponse{
		Status: "ok",
		Name:   name,
		URL:    url,
		Type:   string(result.Type),
		TookMs: time.Since(start).Milliseconds(),
		Health: healthResult,
	}

	if ttlDuration > 0 {
		resp.Expires = time.Now().Add(ttlDuration).UTC().Format(time.RFC3339)
	}

	output.PrintAndExit(resp)
}

type deployV2Options struct {
	Name          string
	Host          string
	Domain        string
	Health        string
	TTL           string
	Env           []string
	EnvFile       string
	ContainerPort int // Port the container listens on (default 80 for Docker)
	Pretty        bool
}

// deployContext holds all info needed for a deploy
type deployContext struct {
	SSHHost    string       // SSH connection string (config alias or user@host)
	HostConfig *state.Host  // Host configuration
	Name       string       // Deploy name
	Path       string       // Local path to deploy
	URL        string       // Full URL after deploy
	Opts       deployV2Options
}

// validateNameV2 checks if name matches allowed pattern
func validateNameV2(name string) *output.ErrorResponse {
	// Must be lowercase alphanumeric with hyphens, 1-63 chars
	pattern := regexp.MustCompile(`^[a-z0-9][a-z0-9-]{0,61}[a-z0-9]$|^[a-z0-9]$`)
	if !pattern.MatchString(name) {
		return output.Err(output.ErrInvalidName,
			"name must be lowercase alphanumeric with hyphens, 1-63 characters")
	}
	return nil
}

// generateName creates a random deploy name
func generateName() string {
	bytes := make([]byte, 3)
	rand.Read(bytes)
	return "ship-" + hex.EncodeToString(bytes)
}

// parseTTL converts duration strings like "1h", "7d" to time.Duration
func parseTTL(s string) (time.Duration, error) {
	s = strings.TrimSpace(s)
	if s == "" {
		return 0, nil
	}

	// Handle days specially (not supported by time.ParseDuration)
	if strings.HasSuffix(s, "d") {
		days := strings.TrimSuffix(s, "d")
		var d int
		_, err := fmt.Sscanf(days, "%d", &d)
		if err != nil {
			return 0, fmt.Errorf("invalid TTL: %s", s)
		}
		return time.Duration(d) * 24 * time.Hour, nil
	}

	d, err := time.ParseDuration(s)
	if err != nil {
		return 0, fmt.Errorf("invalid TTL: %s", s)
	}
	return d, nil
}

// Deploy implementations are in deploy_impl_v2.go