package content

import (
	"fmt"
	"log"
	"os"
	"path/filepath"
	"strings"
	"sync"

	"github.com/insertr/insertr/internal/config"
	"github.com/insertr/insertr/internal/db"
	"github.com/insertr/insertr/internal/engine"
	"maps"
)

// SiteManager handles registration and enhancement of static sites
type SiteManager struct {
	sites         map[string]*config.SiteConfig
	enhancer      *Enhancer
	mutex         sync.RWMutex
	devMode       bool
	contentClient db.ContentRepository
	authProvider  *engine.AuthProvider
}

// NewSiteManager creates a new site manager
func NewSiteManager(contentClient db.ContentRepository, devMode bool) *SiteManager {
	return &SiteManager{
		sites:         make(map[string]*config.SiteConfig),
		enhancer:      NewDefaultEnhancer(contentClient, ""), // siteID will be set per operation
		devMode:       devMode,
		contentClient: contentClient,
		authProvider:  &engine.AuthProvider{Type: "mock"}, // default
	}
}

// NewSiteManagerWithAuth creates a new site manager with auth provider
func NewSiteManagerWithAuth(contentClient db.ContentRepository, devMode bool, authProvider *engine.AuthProvider) *SiteManager {
	if authProvider == nil {
		authProvider = &engine.AuthProvider{Type: "mock"}
	}
	return &SiteManager{
		sites:         make(map[string]*config.SiteConfig),
		contentClient: contentClient,
		authProvider:  authProvider,
		devMode:       devMode,
	}
}

// RegisterSite adds a site to the manager
func (sm *SiteManager) RegisterSite(config *config.SiteConfig) error {
	sm.mutex.Lock()
	defer sm.mutex.Unlock()

	// Validate site configuration
	if config.SiteID == "" {
		return fmt.Errorf("site_id is required")
	}
	if config.Path == "" {
		return fmt.Errorf("path is required for site %s", config.SiteID)
	}

	// Check if path exists, auto-create enhancement directories
	if _, err := os.Stat(config.Path); os.IsNotExist(err) {
		// Auto-create directory if it appears to be an enhancement target
		if strings.HasSuffix(config.Path, "_enhanced") {
			log.Printf("📁 Creating enhancement directory: %s", config.Path)
			if err := os.MkdirAll(config.Path, 0755); err != nil {
				return fmt.Errorf("failed to create enhancement directory %s: %w", config.Path, err)
			}
		} else {
			return fmt.Errorf("site path does not exist: %s", config.Path)
		}
	}

	// Convert to absolute path
	absPath, err := filepath.Abs(config.Path)
	if err != nil {
		return fmt.Errorf("failed to resolve absolute path for %s: %w", config.Path, err)
	}
	config.Path = absPath

	sm.sites[config.SiteID] = config
	log.Printf("📁 Registered site %s at %s", config.SiteID, config.Path)

	return nil
}

// RegisterSites bulk registers multiple sites from configuration
func (sm *SiteManager) RegisterSites(configs []*config.SiteConfig) error {
	for _, config := range configs {
		if err := sm.RegisterSite(config); err != nil {
			return fmt.Errorf("failed to register site %s: %w", config.SiteID, err)
		}
	}
	return nil
}

// GetSite returns a registered site configuration
func (sm *SiteManager) GetSite(siteID string) (*config.SiteConfig, bool) {
	sm.mutex.RLock()
	defer sm.mutex.RUnlock()

	site, exists := sm.sites[siteID]
	return site, exists
}

// GetAllSites returns all registered sites
func (sm *SiteManager) GetAllSites() map[string]*config.SiteConfig {
	sm.mutex.RLock()
	defer sm.mutex.RUnlock()

	// Return a copy to prevent external modification
	result := make(map[string]*config.SiteConfig)
	maps.Copy(result, sm.sites)
	return result
}

// IsAutoEnhanceEnabled checks if a site has auto-enhancement enabled
func (sm *SiteManager) IsAutoEnhanceEnabled(siteID string) bool {
	sm.mutex.RLock()
	defer sm.mutex.RUnlock()

	site, exists := sm.sites[siteID]
	return exists && site.AutoEnhance
}

// EnhanceSite performs enhancement from source to output directory
func (sm *SiteManager) EnhanceSite(siteID string) error {
	sm.mutex.RLock()
	site, exists := sm.sites[siteID]
	sm.mutex.RUnlock()

	if !exists {
		return fmt.Errorf("site %s is not registered", siteID)
	}

	// Use source path if available, otherwise use main path (for backwards compatibility)
	sourcePath := site.SourcePath
	if sourcePath == "" {
		sourcePath = site.Path
	}
	outputPath := site.Path

	log.Printf("🔄 Enhancing site %s from %s to %s", siteID, sourcePath, outputPath)

	// Create output directory if it doesn't exist
	if err := os.MkdirAll(outputPath, 0755); err != nil {
		return fmt.Errorf("failed to create output directory %s: %w", outputPath, err)
	}

	// Create enhancer with auth provider for this operation
	// Discovery disabled by default - developers should explicitly mark elements with class="insertr"
	discoveryConfig := DiscoveryConfig{
		Enabled:    false, // Changed from true - respect developer intent
		Aggressive: false,
		Containers: true,
		Individual: true,
	}

	// Override with site-specific discovery config if provided
	if site.Discovery != nil {
		discoveryConfig = *site.Discovery
		log.Printf("🔧 Using site-specific discovery config for %s: enabled=%v, aggressive=%v",
			siteID, discoveryConfig.Enabled, discoveryConfig.Aggressive)
	}

	config := EnhancementConfig{
		Discovery:        discoveryConfig,
		ContentInjection: true,
		GenerateIDs:      true,
	}
	enhancer := NewEnhancerWithAuth(sm.contentClient, siteID, config, sm.authProvider)

	// Perform enhancement from source to output
	if err := enhancer.EnhanceDirectory(sourcePath, outputPath); err != nil {
		return fmt.Errorf("failed to enhance site %s: %w", siteID, err)
	}

	log.Printf("✅ Successfully enhanced site %s", siteID)
	return nil
}

// EnhanceAllSites enhances all registered sites that have auto-enhancement enabled
func (sm *SiteManager) EnhanceAllSites() error {
	sm.mutex.RLock()
	sites := make([]*config.SiteConfig, 0, len(sm.sites))
	for _, site := range sm.sites {
		if site.AutoEnhance {
			sites = append(sites, site)
		}
	}
	sm.mutex.RUnlock()

	var errors []error
	for _, site := range sites {
		if err := sm.EnhanceSite(site.SiteID); err != nil {
			errors = append(errors, err)
		}
	}

	if len(errors) > 0 {
		return fmt.Errorf("enhancement failed for some sites: %v", errors)
	}

	return nil
}

// GetStats returns statistics about registered sites
func (sm *SiteManager) GetStats() map[string]any {
	sm.mutex.RLock()
	defer sm.mutex.RUnlock()

	autoEnhanceCount := 0
	for _, site := range sm.sites {
		if site.AutoEnhance {
			autoEnhanceCount++
		}
	}

	return map[string]interface{}{
		"total_sites":        len(sm.sites),
		"auto_enhance_sites": autoEnhanceCount,
	}
}