package deploy

import (
	"fmt"
	"os"
	"strings"

	"github.com/openboatmobile/obm/internal/config"
	"github.com/openboatmobile/obm/internal/prompt"
)

// Run executes the interactive deploy walkthrough.
func Run() error {
	cfg := &config.DeploymentConfig{}

	// Interactive mode - use prompt package for user input
	return runInteractive(cfg)
}

// RunFromFile executes deployment from a YAML config file (non-interactive mode).
// This is designed for CI/CD pipelines where all configuration is predefined.
func RunFromFile(configPath string) error {
	cfg, err := config.LoadYAMLConfig(configPath)
	if err != nil {
		return fmt.Errorf("failed to load config: %w", err)
	}

	deployCfg := cfg.ToDeploymentConfig()

	// Non-interactive mode - write config and proceed
	return writeConfig(deployCfg, configPath)
}

// RunWithConfig executes deployment with a pre-built DeploymentConfig.
// This is useful for programmatic usage where config is constructed elsewhere.
func RunWithConfig(cfg *config.DeploymentConfig) error {
	return writeConfig(cfg, "<config>")
}

// runInteractive handles the interactive wizard flow.
func runInteractive(cfg *config.DeploymentConfig) error {

	prompt.Header("🚢 OpenBoatmobile — Deploy your AI agent")

	stepFramework(cfg)
	stepCloudProvider(cfg)
	stepProviderToken(cfg)
	stepSSHKey(cfg)
	stepServerConfig(cfg)
	stepInferenceProvider(cfg)
	stepTailscale(cfg)
	stepDiscord(cfg)
	stepSummaryAndWrite(cfg)

	return nil
}

func stepFramework(cfg *config.DeploymentConfig) {
	prompt.StepHeader(1, "Agent Framework")
	idx, err := prompt.Select("Choose your agent framework:", []string{
		"Hermes Agent (Nous Research) — Python-based, highly configurable",
		"OpenClaw — Node.js-based, simpler setup",
	})
	if err != nil {
		prompt.Error(err.Error())
		return
	}
	cfg.Framework = []string{"hermes", "openclaw"}[idx-1]
	prompt.Success(fmt.Sprintf("Selected: %s", cfg.Framework))

	if cfg.Framework == "openclaw" {
		cfg.OpenClawVersion = "lts"
		cfg.NodeVersion = "22"
		cfg.EnableSwap = true
		cfg.SwapSizeGB = 2
		cfg.EnableFail2ban = true
		cfg.EnableUnattendedUpgrades = true
	}
	if cfg.Framework == "hermes" {
		cfg.DockerEnabled = true
		cfg.VeniceBaseURL = "https://api.venice.ai/api/v1"
		cfg.GatewayAllowAllUsers = true
		cfg.DiscordAutoThread = true
	}
}

func stepCloudProvider(cfg *config.DeploymentConfig) {
	prompt.StepHeader(2, "Cloud Provider")
	idx, err := prompt.Select("Choose your cloud provider:", []string{
		"Hetzner Cloud — from €4.49/mo (recommended, ~70% cheaper)",
		"DigitalOcean — from $6/mo (wider region availability)",
	})
	if err != nil {
		prompt.Error(err.Error())
		return
	}
	cfg.CloudProvider = []string{"hetzner", "digitalocean"}[idx-1]
	prompt.Success(fmt.Sprintf("Selected: %s", cfg.CloudProvider))
}

func stepProviderToken(cfg *config.DeploymentConfig) {
	prompt.StepHeader(3, "Provider API Token")

	switch cfg.CloudProvider {
	case "hetzner":
		prompt.Info("Get yours at: https://console.hetzner.cloud/ → Security → API Tokens")
		cfg.HetznerToken = prompt.Password("Hetzner API token")
		if cfg.HetznerToken != "" {
			prompt.Success("Token saved (will be validated in a future step)")
		}
	case "digitalocean":
		prompt.Info("Get yours at: https://cloud.digitalocean.com/account/api/tokens")
		cfg.DOToken = prompt.Password("DigitalOcean API token")
		if cfg.DOToken != "" {
			prompt.Success("Token saved (will be validated in a future step)")
		}
	}
}

func stepSSHKey(cfg *config.DeploymentConfig) {
	prompt.StepHeader(4, "SSH Key")

	if cfg.CloudProvider == "hetzner" {
		prompt.Info("Enter the name of your SSH key as shown in Hetzner Cloud Console")
		name := prompt.Input("SSH key name", "")
		if name != "" {
			cfg.SSHKeyNames = []string{name}
			prompt.Success(fmt.Sprintf("SSH key: %s", name))
		}
	} else {
		prompt.Info("Enter the fingerprint of your SSH key from DigitalOcean")
		fp := prompt.Input("SSH key fingerprint", "")
		if fp != "" {
			cfg.SSHKeyFingerprints = []string{fp}
			prompt.Success(fmt.Sprintf("SSH key fingerprint: %s", prompt.MaskValue(fp)))
		}
	}
}

func stepServerConfig(cfg *config.DeploymentConfig) {
	prompt.StepHeader(5, "Server Configuration")

	cfg.ServerName = prompt.Input("Server name", "agent-gateway")

	if cfg.CloudProvider == "hetzner" {
		idx, _ := prompt.SelectWithDefault("Location:", []string{
			"ash — Ashburn, VA (US East)",
			"fsn1 — Falkenstein (EU Central)",
			"nbg1 — Nuremberg (EU Central)",
			"hel1 — Helsinki (EU North)",
		}, 1)
		cfg.Location = []string{"ash", "fsn1", "nbg1", "hel1"}[idx-1]

		idx, _ = prompt.SelectWithDefault("Server type:", []string{
			"cpx21 — 3 vCPU, 4 GB RAM, 80 GB (€4.49/mo) — recommended",
			"cx23 — 2 vCPU, 4 GB RAM, 80 GB (€5.83/mo)",
			"cpx31 — 4 vCPU, 8 GB RAM, 80 GB (€8.98/mo)",
		}, 1)
		cfg.ServerType = []string{"cpx21", "cx23", "cpx31"}[idx-1]

	} else {
		idx, _ := prompt.SelectWithDefault("Region:", []string{
			"nyc3 — New York (US East)",
			"sfo2 — San Francisco (US West)",
			"ams3 — Amsterdam (EU)",
			"lon1 — London (EU)",
			"sgp1 — Singapore (AP)",
		}, 1)
		cfg.Region = []string{"nyc3", "sfo2", "ams3", "lon1", "sgp1"}[idx-1]

		idx, _ = prompt.SelectWithDefault("Droplet size:", []string{
			"s-2vcpu-4gb — 2 vCPU, 4 GB RAM ($24/mo)",
			"s-4vcpu-8gb — 4 vCPU, 8 GB RAM ($48/mo)",
		}, 1)
		cfg.DropletSize = []string{"s-2vcpu-4gb", "s-4vcpu-8gb"}[idx-1]
	}

	cfg.AgentName = prompt.Input("Agent name", cfg.Framework)
	cfg.AgentTimezone = prompt.Input("Timezone", "UTC")

	if cfg.Framework == "hermes" {
		cfg.DockerEnabled = prompt.Confirm("Use Docker deployment?", true)
	}
}

func stepInferenceProvider(cfg *config.DeploymentConfig) {
	prompt.StepHeader(6, "Inference Provider")

	idx, err := prompt.Select("Primary inference provider:", []string{
		"Venice AI — uncensored, privacy-focused (recommended)",
		"OpenRouter — aggregator with many models",
		"OpenAI — GPT-4o, o1, etc.",
		"Anthropic — Claude models",
		"Custom — OpenAI-compatible endpoint",
	})
	if err != nil {
		prompt.Error(err.Error())
		return
	}

	providers := []string{"venice", "openrouter", "openai", "anthropic", "custom"}
	cfg.InferenceProvider = providers[idx-1]

	switch cfg.InferenceProvider {
	case "venice":
		prompt.Info("Get your key at: https://venice.ai → Settings → API Keys")
		cfg.InferenceAPIKey = prompt.Password("Venice AI API key")
		cfg.InferenceBaseURL = "https://api.venice.ai/api/v1"
		cfg.VeniceBaseURL = cfg.InferenceBaseURL
		prompt.Success("Venice AI key saved")
	case "openrouter":
		prompt.Info("Get your key at: https://openrouter.ai/keys")
		cfg.InferenceAPIKey = prompt.Password("OpenRouter API key")
		cfg.InferenceBaseURL = "https://openrouter.ai/api/v1"
		prompt.Success("OpenRouter key saved")
	case "openai":
		cfg.InferenceAPIKey = prompt.Password("OpenAI API key")
		cfg.InferenceBaseURL = "https://api.openai.com/v1"
		prompt.Success("OpenAI key saved")
	case "anthropic":
		cfg.InferenceAPIKey = prompt.Password("Anthropic API key")
		cfg.InferenceBaseURL = "https://api.anthropic.com"
		prompt.Success("Anthropic key saved")
	case "custom":
		cfg.InferenceBaseURL = prompt.Input("Base URL", "")
		cfg.InferenceAPIKey = prompt.Password("API key")
		prompt.Success("Custom provider configured")
	}

	// Model selection
	prompt.Info("Enter model ID (e.g. zai-org-glm-5, gpt-4o, claude-sonnet-4)")
	cfg.PrimaryModel = prompt.Input("Primary model", defaultModel(cfg.InferenceProvider))
	if cfg.PrimaryModel != "" {
		prompt.Success(fmt.Sprintf("Primary model: %s", cfg.PrimaryModel))
	}

	// Fallback models
	if prompt.Confirm("Add fallback models?", false) {
		for {
			fb := prompt.Input("Fallback model ID (blank to stop)", "")
			if fb == "" {
				break
			}
			cfg.FallbackModels = append(cfg.FallbackModels, fb)
		}
		if len(cfg.FallbackModels) > 0 {
			prompt.Success(fmt.Sprintf("Fallback models: %s", strings.Join(cfg.FallbackModels, ", ")))
		}
	}
}

func stepTailscale(cfg *config.DeploymentConfig) {
	prompt.StepHeader(7, "Remote Access")

	cfg.EnableTailscale = prompt.Confirm("Install Tailscale for secure remote access? (recommended)", true)
	if cfg.EnableTailscale {
		prompt.Info("Get your key at: https://login.tailscale.com/admin/settings/keys")
		cfg.TailscaleAuthKey = prompt.Password("Tailscale auth key")
		cfg.TailnetDomain = prompt.Input("Tailnet domain", "tailnet")
		prompt.Success("Tailscale configured")
	} else {
		prompt.Warn("Without Tailscale, you'll need SSH or another method for remote access")
	}
}

func stepDiscord(cfg *config.DeploymentConfig) {
	prompt.StepHeader(8, "Discord Integration")

	cfg.EnableDiscord = prompt.Confirm("Connect to Discord?", false)
	if !cfg.EnableDiscord {
		return
	}

	prompt.Info("Create a bot at: https://discord.com/developers/applications")
	cfg.DiscordBotToken = prompt.Password("Discord bot token")
	cfg.DiscordServerID = prompt.Input("Server/guild ID", "")

	// User IDs
	for {
		uid := prompt.Input("Discord user ID (blank to stop)", "")
		if uid == "" {
			break
		}
		cfg.DiscordUserIDs = append(cfg.DiscordUserIDs, uid)
	}

	if cfg.Framework == "hermes" {
		cfg.DiscordHomeChannel = prompt.Input("Home channel ID", "")
		cfg.DiscordAutoThread = prompt.Confirm("Auto-create threads on @mention?", true)
	}

	prompt.Success("Discord configured")
}

func stepSummaryAndWrite(cfg *config.DeploymentConfig) {
	prompt.Divider()
	prompt.Header("Configuration Summary")
	prompt.Divider()

	prompt.SummaryLine("Framework", cfg.Framework)
	prompt.SummaryLine("Provider", fmt.Sprintf("%s (%s)", cfg.CloudProvider, config.LocationOrRegion(cfg)))
	prompt.SummaryLine("Server", fmt.Sprintf("%s — %s", config.ServerTypeOrDroplet(cfg), cfg.MonthlyCostEstimate()))
	prompt.SummaryLine("SSH Key", config.SSHKeySummary(cfg))
	prompt.SummaryLine("Inference", fmt.Sprintf("%s → %s", cfg.InferenceProvider, cfg.PrimaryModel))
	if len(cfg.FallbackModels) > 0 {
		prompt.SummaryLine("Fallbacks", strings.Join(cfg.FallbackModels, ", "))
	}
	prompt.SummaryLine("Tailscale", boolStr(cfg.EnableTailscale))
	prompt.SummaryLine("Discord", boolStr(cfg.EnableDiscord))
	if cfg.BraveSearchAPIKey != "" {
		prompt.SummaryLine("Brave Search", "configured")
	}

	prompt.Divider()

	if !prompt.Confirm("Write .env file?", true) {
		prompt.Warn("Aborted — no files written")
		return
	}

	// Write the config
	if err := writeConfig(cfg, ".env"); err != nil {
		prompt.Error(err.Error())
		return
	}
	prompt.Success(".env file written")

	if prompt.Confirm("Run terraform init && terraform apply?", false) {
		prompt.Info("Terraform integration coming soon — for now, run manually:")
		fmt.Printf("  source .env && terraform init && terraform apply\n")
	}
}

// writeConfig writes the deployment configuration to a .env file.
// For non-interactive mode, sourceFile is used for error messages.
func writeConfig(cfg *config.DeploymentConfig, sourceFile string) error {
	envContent := buildEnvFile(cfg)

	// Write to .env file
	outputPath := ".env"
	if err := os.WriteFile(outputPath, []byte(envContent), 0644); err != nil {
		return fmt.Errorf("failed to write %s: %w", outputPath, err)
	}

	// Print summary for non-interactive mode
	if sourceFile != ".env" && sourceFile != "<config>" {
		fmt.Printf("Configuration loaded from: %s\n", sourceFile)
	}
	fmt.Printf("Configuration written to: %s\n", outputPath)

	return nil
}

// Helpers

func defaultModel(provider string) string {
	defaults := map[string]string{
		"venice":     "zai-org-glm-5",
		"openrouter": "openai/gpt-4o",
		"openai":     "gpt-4o",
		"anthropic":  "claude-sonnet-4",
		"custom":     "",
	}
	return defaults[provider]
}

func boolStr(b bool) string {
	if b {
		return "Enabled"
	}
	return "Disabled"
}

func buildEnvFile(cfg *config.DeploymentConfig) string {
	var b strings.Builder
	b.WriteString("# Generated by obm\n")
	b.WriteString(fmt.Sprintf("# Framework: %s | Provider: %s\n\n", cfg.Framework, cfg.CloudProvider))

	b.WriteString(fmt.Sprintf("TF_VAR_cloud_provider=%s\n", cfg.CloudProvider))
	b.WriteString(fmt.Sprintf("TF_VAR_agent_framework=%s\n", cfg.Framework))

	// Provider token
	switch cfg.CloudProvider {
	case "hetzner":
		b.WriteString(fmt.Sprintf("TF_VAR_hcloud_token=%s\n", cfg.HetznerToken))
	case "digitalocean":
		b.WriteString(fmt.Sprintf("TF_VAR_do_token=%s\n", cfg.DOToken))
	}

	// SSH keys
	if len(cfg.SSHKeyNames) > 0 {
		b.WriteString(fmt.Sprintf("TF_VAR_ssh_key_names='%s'\n", formatJSONArray(cfg.SSHKeyNames)))
	}
	if len(cfg.SSHKeyFingerprints) > 0 {
		b.WriteString(fmt.Sprintf("TF_VAR_ssh_key_fingerprints='%s'\n", formatJSONArray(cfg.SSHKeyFingerprints)))
	}

	// Server config
	b.WriteString(fmt.Sprintf("TF_VAR_server_name=%s\n", cfg.ServerName))
	b.WriteString(fmt.Sprintf("TF_VAR_agent_name=%s\n", cfg.AgentName))
	b.WriteString(fmt.Sprintf("TF_VAR_agent_timezone=%s\n", cfg.AgentTimezone))

	if cfg.CloudProvider == "hetzner" {
		b.WriteString(fmt.Sprintf("TF_VAR_location_hetzner=%s\n", cfg.Location))
		b.WriteString(fmt.Sprintf("TF_VAR_server_type_hetzner=%s\n", cfg.ServerType))
	}
	if cfg.CloudProvider == "digitalocean" {
		b.WriteString(fmt.Sprintf("TF_VAR_region_digitalocean=%s\n", cfg.Region))
		b.WriteString(fmt.Sprintf("TF_VAR_droplet_size_digitalocean=%s\n", cfg.DropletSize))
	}

	// Inference
	switch cfg.InferenceProvider {
	case "venice":
		b.WriteString(fmt.Sprintf("TF_VAR_venice_api_key=%s\n", cfg.InferenceAPIKey))
		if cfg.VeniceBaseURL != "" {
			b.WriteString(fmt.Sprintf("TF_VAR_venice_base_url=%s\n", cfg.VeniceBaseURL))
		}
	case "openrouter":
		b.WriteString(fmt.Sprintf("TF_VAR_openrouter_api_key=%s\n", cfg.InferenceAPIKey))
	case "openai":
		b.WriteString(fmt.Sprintf("TF_VAR_openai_api_key=%s\n", cfg.InferenceAPIKey))
	case "anthropic":
		b.WriteString(fmt.Sprintf("TF_VAR_anthropic_api_key=%s\n", cfg.InferenceAPIKey))
	}

	// Models
	if cfg.PrimaryModel != "" {
		b.WriteString(fmt.Sprintf("TF_VAR_primary_model=%s\n", cfg.PrimaryModel))
	}
	if len(cfg.FallbackModels) > 0 {
		b.WriteString(fmt.Sprintf("TF_VAR_fallback_models='%s'\n", formatJSONArray(cfg.FallbackModels)))
	}

	// Hermes-specific
	if cfg.Framework == "hermes" {
		b.WriteString(fmt.Sprintf("TF_VAR_docker_enabled=%v\n", cfg.DockerEnabled))
	}

	// OpenClaw-specific
	if cfg.Framework == "openclaw" {
		b.WriteString(fmt.Sprintf("TF_VAR_openclaw_version=%s\n", cfg.OpenClawVersion))
		b.WriteString(fmt.Sprintf("TF_VAR_node_version=%s\n", cfg.NodeVersion))
	}

	// Tailscale
	if cfg.EnableTailscale {
		b.WriteString("TF_VAR_enable_tailscale=true\n")
		b.WriteString(fmt.Sprintf("TF_VAR_tailscale_auth_key=%s\n", cfg.TailscaleAuthKey))
		b.WriteString(fmt.Sprintf("TF_VAR_tailscale_tailnet_domain=%s\n", cfg.TailnetDomain))
	}

	// Discord
	if cfg.EnableDiscord {
		b.WriteString(fmt.Sprintf("TF_VAR_discord_bot_token=%s\n", cfg.DiscordBotToken))
		b.WriteString(fmt.Sprintf("TF_VAR_discord_server_id=%s\n", cfg.DiscordServerID))
		if len(cfg.DiscordUserIDs) > 0 {
			b.WriteString(fmt.Sprintf("TF_VAR_discord_user_id='%s'\n", formatJSONArray(cfg.DiscordUserIDs)))
		}
	}

	// Optional
	if cfg.BraveSearchAPIKey != "" {
		b.WriteString(fmt.Sprintf("TF_VAR_brave_search_api_key=%s\n", cfg.BraveSearchAPIKey))
	}

	return b.String()
}

func formatJSONArray(items []string) string {
	quoted := make([]string, len(items))
	for i, item := range items {
		quoted[i] = fmt.Sprintf(`"%s"`, item)
	}
	return fmt.Sprintf("[%s]", strings.Join(quoted, ", "))
}