package world

import (
	"fmt"
)

// AchievementEventType represents different types of achievement events
type AchievementEventType int

const (
	// Combat events
	EventNPCKill AchievementEventType = iota
	EventPlayerKill
	EventDeathByNPC
	EventDeathByPlayer
	EventDamageDealt
	EventHealingDone

	// Quest events
	EventQuestCompleted
	EventQuestStep
	EventQuestStarted
	EventQuestAbandoned

	// Skill events
	EventSkillIncrease
	EventSkillMastery
	EventSpellLearned
	EventSpellCast

	// Item events
	EventItemDiscovered
	EventItemCrafted
	EventItemLooted
	EventItemEquipped
	EventItemSold
	EventItemBought

	// Exploration events
	EventZoneDiscovered
	EventLocationDiscovered
	EventPOIDiscovered

	// Social events
	EventGuildJoin
	EventGuildLeave
	EventGroupJoin
	EventGroupLeave
	EventFriendAdded
	EventPlayerTell

	// Harvesting/Crafting events
	EventHarvest
	EventRareHarvest
	EventCraftingSuccess
	EventCraftingFailure
	EventRecipeDiscovered

	// Level/Experience events
	EventLevelGain
	EventAAPoint
	EventExperienceGain
	EventStatusGain

	// PvP events
	EventPvPKill
	EventPvPDeath
	EventPvPAssist
	EventArenaWin
	EventArenaLoss

	// Special events
	EventHeroicOpportunity
	EventRaidBoss
	EventInstanceComplete
	EventCollectionComplete
)

// AchievementEvent represents a single achievement-related event
type AchievementEvent struct {
	Type        AchievementEventType
	CharacterID int32
	Data        map[string]any
	Timestamp   int64
}

// AchievementEventHandler processes achievement events
type AchievementEventHandler struct {
	world *World
}

// NewAchievementEventHandler creates a new achievement event handler
func NewAchievementEventHandler(world *World) *AchievementEventHandler {
	return &AchievementEventHandler{
		world: world,
	}
}

// ProcessEvent processes an achievement event and updates progress
func (aeh *AchievementEventHandler) ProcessEvent(event *AchievementEvent) error {
	if event == nil {
		return fmt.Errorf("event cannot be nil")
	}

	// Get player's achievement manager
	achievementMgr := aeh.world.GetAchievementManager()
	if achievementMgr == nil {
		return fmt.Errorf("achievement manager not available")
	}

	// Process different event types
	switch event.Type {
	case EventNPCKill:
		return aeh.handleNPCKill(event, achievementMgr)
	case EventQuestCompleted:
		return aeh.handleQuestCompleted(event, achievementMgr)
	case EventLevelGain:
		return aeh.handleLevelGain(event, achievementMgr)
	case EventSkillIncrease:
		return aeh.handleSkillIncrease(event, achievementMgr)
	case EventItemDiscovered:
		return aeh.handleItemDiscovered(event, achievementMgr)
	case EventZoneDiscovered:
		return aeh.handleZoneDiscovered(event, achievementMgr)
	case EventHarvest:
		return aeh.handleHarvest(event, achievementMgr)
	case EventPvPKill:
		return aeh.handlePvPKill(event, achievementMgr)
	default:
		// For unhandled events, try generic processing
		return aeh.handleGenericEvent(event, achievementMgr)
	}
}

// handleNPCKill processes NPC kill events
func (aeh *AchievementEventHandler) handleNPCKill(event *AchievementEvent, achievementMgr *AchievementManager) error {
	npcID, ok := event.Data["npc_id"].(int32)
	if !ok {
		return fmt.Errorf("npc_id not found in event data")
	}

	level, ok := event.Data["level"].(int32)
	if !ok {
		level = 1 // Default level
	}

	// Update generic kill count achievements
	err := achievementMgr.UpdateProgress(event.CharacterID, 1, 1) // Achievement ID 1: "First Blood"
	if err != nil {
		fmt.Printf("Error updating kill achievement: %v\n", err)
	}

	// Update level-specific kill achievements
	if level >= 10 {
		achievementMgr.UpdateProgress(event.CharacterID, 2, 1) // Achievement ID 2: "Veteran Hunter"
	}

	// Update specific NPC kill achievements (example)
	if npcID == 100 { // Boss NPC
		achievementMgr.UpdateProgress(event.CharacterID, 10, 1) // Achievement ID 10: "Boss Slayer"
	}

	return nil
}

// handleQuestCompleted processes quest completion events
func (aeh *AchievementEventHandler) handleQuestCompleted(event *AchievementEvent, achievementMgr *AchievementManager) error {
	questID, ok := event.Data["quest_id"].(int32)
	if !ok {
		return fmt.Errorf("quest_id not found in event data")
	}

	// Update quest completion achievements
	err := achievementMgr.UpdateProgress(event.CharacterID, 20, 1) // Achievement ID 20: "Quest Master"
	if err != nil {
		fmt.Printf("Error updating quest achievement: %v\n", err)
	}

	// Update specific quest achievements
	if questID == 1000 { // Main story quest
		achievementMgr.UpdateProgress(event.CharacterID, 21, 1) // Achievement ID 21: "Hero's Journey"
	}

	return nil
}

// handleLevelGain processes level gain events
func (aeh *AchievementEventHandler) handleLevelGain(event *AchievementEvent, achievementMgr *AchievementManager) error {
	newLevel, ok := event.Data["level"].(int32)
	if !ok {
		return fmt.Errorf("level not found in event data")
	}

	// Update level-based achievements
	switch newLevel {
	case 10:
		achievementMgr.UpdateProgress(event.CharacterID, 30, 1) // Achievement ID 30: "Growing Strong"
	case 20:
		achievementMgr.UpdateProgress(event.CharacterID, 31, 1) // Achievement ID 31: "Seasoned Adventurer"
	case 50:
		achievementMgr.UpdateProgress(event.CharacterID, 32, 1) // Achievement ID 32: "Veteran"
	case 90:
		achievementMgr.UpdateProgress(event.CharacterID, 33, 1) // Achievement ID 33: "Master Adventurer"
	}

	// Update max level achievement
	achievementMgr.UpdateProgress(event.CharacterID, 34, uint32(newLevel)) // Achievement ID 34: "Level Up!"

	return nil
}

// handleSkillIncrease processes skill increase events
func (aeh *AchievementEventHandler) handleSkillIncrease(event *AchievementEvent, achievementMgr *AchievementManager) error {
	skillID, ok := event.Data["skill_id"].(int32)
	if !ok {
		return fmt.Errorf("skill_id not found in event data")
	}

	skillLevel, ok := event.Data["skill_level"].(int32)
	if !ok {
		return fmt.Errorf("skill_level not found in event data")
	}

	// Update skill mastery achievements based on skill type
	switch skillID {
	case 1: // Melee skill
		if skillLevel >= 300 {
			achievementMgr.UpdateProgress(event.CharacterID, 40, 1) // Achievement ID 40: "Weapon Master"
		}
	case 10: // Magic skill
		if skillLevel >= 300 {
			achievementMgr.UpdateProgress(event.CharacterID, 41, 1) // Achievement ID 41: "Arcane Scholar"
		}
	case 20: // Crafting skill
		if skillLevel >= 300 {
			achievementMgr.UpdateProgress(event.CharacterID, 42, 1) // Achievement ID 42: "Master Craftsman"
		}
	}

	return nil
}

// handleItemDiscovered processes item discovery events
func (aeh *AchievementEventHandler) handleItemDiscovered(event *AchievementEvent, achievementMgr *AchievementManager) error {
	itemID, ok := event.Data["item_id"].(int32)
	if !ok {
		return fmt.Errorf("item_id not found in event data")
	}

	rarity, ok := event.Data["rarity"].(string)
	if !ok {
		rarity = "common"
	}

	// Update item discovery achievements
	achievementMgr.UpdateProgress(event.CharacterID, 50, 1) // Achievement ID 50: "Treasure Hunter"

	// Update rarity-specific achievements
	switch rarity {
	case "rare":
		achievementMgr.UpdateProgress(event.CharacterID, 51, 1) // Achievement ID 51: "Rare Collector"
	case "legendary":
		achievementMgr.UpdateProgress(event.CharacterID, 52, 1) // Achievement ID 52: "Legend Seeker"
	case "mythical":
		achievementMgr.UpdateProgress(event.CharacterID, 53, 1) // Achievement ID 53: "Myth Walker"
	}

	// Specific item achievements
	if itemID == 12345 { // Special artifact
		achievementMgr.UpdateProgress(event.CharacterID, 54, 1) // Achievement ID 54: "Ancient Artifact"
	}

	return nil
}

// handleZoneDiscovered processes zone discovery events
func (aeh *AchievementEventHandler) handleZoneDiscovered(event *AchievementEvent, achievementMgr *AchievementManager) error {
	zoneID, ok := event.Data["zone_id"].(int32)
	if !ok {
		return fmt.Errorf("zone_id not found in event data")
	}

	// Update exploration achievements
	achievementMgr.UpdateProgress(event.CharacterID, 60, 1) // Achievement ID 60: "Explorer"

	// Update specific zone achievements
	switch zoneID {
	case 1: // Starting zone
		achievementMgr.UpdateProgress(event.CharacterID, 61, 1) // Achievement ID 61: "First Steps"
	case 100: // End game zone
		achievementMgr.UpdateProgress(event.CharacterID, 62, 1) // Achievement ID 62: "Into the Unknown"
	}

	return nil
}

// handleHarvest processes harvesting events
func (aeh *AchievementEventHandler) handleHarvest(event *AchievementEvent, achievementMgr *AchievementManager) error {
	resourceType, ok := event.Data["resource_type"].(string)
	if !ok {
		return fmt.Errorf("resource_type not found in event data")
	}

	isRare, _ := event.Data["is_rare"].(bool)

	// Update harvesting achievements
	achievementMgr.UpdateProgress(event.CharacterID, 70, 1) // Achievement ID 70: "Gatherer"

	// Update resource-specific achievements
	switch resourceType {
	case "ore":
		achievementMgr.UpdateProgress(event.CharacterID, 71, 1) // Achievement ID 71: "Miner"
	case "wood":
		achievementMgr.UpdateProgress(event.CharacterID, 72, 1) // Achievement ID 72: "Lumberjack"
	case "fish":
		achievementMgr.UpdateProgress(event.CharacterID, 73, 1) // Achievement ID 73: "Angler"
	}

	// Update rare harvest achievement
	if isRare {
		achievementMgr.UpdateProgress(event.CharacterID, 74, 1) // Achievement ID 74: "Lucky Find"
	}

	return nil
}

// handlePvPKill processes PvP kill events
func (aeh *AchievementEventHandler) handlePvPKill(event *AchievementEvent, achievementMgr *AchievementManager) error {
	targetLevel, ok := event.Data["target_level"].(int32)
	if !ok {
		targetLevel = 1
	}

	// Update PvP achievements
	achievementMgr.UpdateProgress(event.CharacterID, 80, 1) // Achievement ID 80: "First Blood PvP"

	// Update level-based PvP achievements
	if targetLevel >= 50 {
		achievementMgr.UpdateProgress(event.CharacterID, 81, 1) // Achievement ID 81: "Veteran Slayer"
	}

	return nil
}

// handleGenericEvent processes generic events
func (aeh *AchievementEventHandler) handleGenericEvent(event *AchievementEvent, achievementMgr *AchievementManager) error {
	// For events without specific handlers, attempt generic progress updates
	// This allows for easy extension without requiring handler updates

	// Log unhandled event types for debugging
	fmt.Printf("Unhandled achievement event type: %d for character %d\n",
		int(event.Type), event.CharacterID)

	return nil
}

// TriggerEvent is a convenience method for triggering achievement events
func (w *World) TriggerAchievementEvent(eventType AchievementEventType, characterID int32, data map[string]any) {
	if w.achievementMgr == nil {
		return // Achievement system not initialized
	}

	event := &AchievementEvent{
		Type:        eventType,
		CharacterID: characterID,
		Data:        data,
		Timestamp:   int64(w.worldTime.Year), // Use game time as timestamp
	}

	handler := NewAchievementEventHandler(w)
	go func() {
		if err := handler.ProcessEvent(event); err != nil {
			fmt.Printf("Error processing achievement event: %v\n", err)
		}
	}()
}

// Convenience methods for common events

// OnNPCKill triggers an NPC kill achievement event
func (w *World) OnNPCKill(characterID int32, npcID int32, npcLevel int32) {
	w.TriggerAchievementEvent(EventNPCKill, characterID, map[string]any{
		"npc_id": npcID,
		"level":  npcLevel,
	})
}

// OnQuestComplete triggers a quest completion achievement event
func (w *World) OnQuestComplete(characterID int32, questID int32) {
	w.TriggerAchievementEvent(EventQuestCompleted, characterID, map[string]any{
		"quest_id": questID,
	})
}

// OnLevelGain triggers a level gain achievement event
func (w *World) OnLevelGain(characterID int32, newLevel int32) {
	w.TriggerAchievementEvent(EventLevelGain, characterID, map[string]any{
		"level": newLevel,
	})
}

// OnItemDiscovered triggers an item discovery achievement event
func (w *World) OnItemDiscovered(characterID int32, itemID int32, rarity string) {
	w.TriggerAchievementEvent(EventItemDiscovered, characterID, map[string]any{
		"item_id": itemID,
		"rarity":  rarity,
	})
}

// OnZoneDiscovered triggers a zone discovery achievement event
func (w *World) OnZoneDiscovered(characterID int32, zoneID int32) {
	w.TriggerAchievementEvent(EventZoneDiscovered, characterID, map[string]any{
		"zone_id": zoneID,
	})
}