package interceptors

import (
	"sync"
	"time"

	"github.com/safedep/pmg/analyzer"
)

// CooldownBlock records a package blocked by the dependency cooldown policy.
type CooldownBlock struct {
	Name         string
	Version      string
	PublishDate  time.Time
	DaysAgo      int
	DaysLeft     int
	CooldownDays int
}

// AnalysisStats contains aggregated statistics from analysis results
type AnalysisStats struct {
	TotalAnalyzed        int
	AllowedCount         int
	ConfirmedCount       int
	BlockedCount         int
	UserCancelledCount   int
	CooldownBlockedCount int
}

// AnalysisStatsCollector tracks analysis statistics during proxy execution.
// It is separate from the cache to allow different cache implementations
// without coupling them to reporting concerns.
type AnalysisStatsCollector struct {
	mu                sync.RWMutex
	stats             AnalysisStats
	blockedPackages   []*analyzer.PackageVersionAnalysisResult
	confirmedPackages []*analyzer.PackageVersionAnalysisResult
	cooldownBlocks    []CooldownBlock
}

// NewAnalysisStatsCollector creates a new stats collector
func NewAnalysisStatsCollector() *AnalysisStatsCollector {
	return &AnalysisStatsCollector{}
}

// RecordAllowed records a package that was allowed (safe)
func (c *AnalysisStatsCollector) RecordAllowed(result *analyzer.PackageVersionAnalysisResult) {
	if result == nil {
		return
	}

	c.mu.Lock()
	defer c.mu.Unlock()

	c.stats.TotalAnalyzed++
	c.stats.AllowedCount++
}

// RecordBlocked records a package that was automatically blocked (ActionBlock)
func (c *AnalysisStatsCollector) RecordBlocked(result *analyzer.PackageVersionAnalysisResult) {
	if result == nil {
		return
	}

	c.mu.Lock()
	defer c.mu.Unlock()

	c.stats.TotalAnalyzed++
	c.stats.BlockedCount++
	c.blockedPackages = append(c.blockedPackages, result)
}

// RecordUserCancelled records a package that was blocked because user declined confirmation (ActionConfirm declined)
func (c *AnalysisStatsCollector) RecordUserCancelled(result *analyzer.PackageVersionAnalysisResult) {
	if result == nil {
		return
	}

	c.mu.Lock()
	defer c.mu.Unlock()

	c.stats.TotalAnalyzed++
	c.stats.UserCancelledCount++

	// User cancelled packages are counted as blocked as well
	c.stats.BlockedCount++

	c.blockedPackages = append(c.blockedPackages, result)
}

// RecordConfirmed records a package where user confirmed installation despite warning
func (c *AnalysisStatsCollector) RecordConfirmed(result *analyzer.PackageVersionAnalysisResult) {
	if result == nil {
		return
	}

	c.mu.Lock()
	defer c.mu.Unlock()

	c.stats.TotalAnalyzed++
	c.stats.ConfirmedCount++
	c.confirmedPackages = append(c.confirmedPackages, result)
}

// GetStats returns the current statistics
func (c *AnalysisStatsCollector) GetStats() AnalysisStats {
	c.mu.RLock()
	defer c.mu.RUnlock()

	return c.stats
}

// GetBlockedPackages returns all blocked packages
func (c *AnalysisStatsCollector) GetBlockedPackages() []*analyzer.PackageVersionAnalysisResult {
	c.mu.RLock()
	defer c.mu.RUnlock()

	// Return a copy to avoid race conditions
	result := make([]*analyzer.PackageVersionAnalysisResult, len(c.blockedPackages))
	copy(result, c.blockedPackages)
	return result
}

// GetConfirmedPackages returns all confirmed packages
func (c *AnalysisStatsCollector) GetConfirmedPackages() []*analyzer.PackageVersionAnalysisResult {
	c.mu.RLock()
	defer c.mu.RUnlock()

	// Return a copy to avoid race conditions
	result := make([]*analyzer.PackageVersionAnalysisResult, len(c.confirmedPackages))
	copy(result, c.confirmedPackages)
	return result
}

// RecordCooldownBlocked records a package blocked by the dependency cooldown policy.
// It increments both the cooldown-specific counter and the overall BlockedCount so that
// inferOutcome correctly treats cooldown-only sessions as OutcomeBlocked.
func (c *AnalysisStatsCollector) RecordCooldownBlocked(name, version string, publishDate time.Time, daysAgo, daysLeft, cooldownDays int) {
	c.mu.Lock()
	defer c.mu.Unlock()

	c.stats.TotalAnalyzed++
	c.stats.BlockedCount++
	c.stats.CooldownBlockedCount++
	c.cooldownBlocks = append(c.cooldownBlocks, CooldownBlock{
		Name:         name,
		Version:      version,
		PublishDate:  publishDate,
		DaysAgo:      daysAgo,
		DaysLeft:     daysLeft,
		CooldownDays: cooldownDays,
	})
}

// GetCooldownBlocks returns all packages blocked by the cooldown policy.
func (c *AnalysisStatsCollector) GetCooldownBlocks() []CooldownBlock {
	c.mu.RLock()
	defer c.mu.RUnlock()

	result := make([]CooldownBlock, len(c.cooldownBlocks))
	copy(result, c.cooldownBlocks)
	return result
}