package transmute

import (
	"fmt"
)

// DatabaseImpl provides a default implementation of the Database interface
type DatabaseImpl struct {
	// Database connection or query executor would go here
	// This is a placeholder implementation
}

// NewDatabase creates a new database implementation
func NewDatabase() *DatabaseImpl {
	return &DatabaseImpl{}
}

// LoadTransmutingTiers loads transmuting tiers from the database
func (db *DatabaseImpl) LoadTransmutingTiers() ([]*TransmutingTier, error) {
	// This is a placeholder implementation
	// In a real implementation, this would query the database:
	// SELECT min_level, max_level, fragment, powder, infusion, mana FROM transmuting
	
	// For now, return some example tiers that match typical EQ2 level ranges
	tiers := []*TransmutingTier{
		{
			MinLevel:   1,
			MaxLevel:   9,
			FragmentID: 1001, // Example fragment item ID
			PowderID:   1002, // Example powder item ID
			InfusionID: 1003, // Example infusion item ID
			ManaID:     1004, // Example mana item ID
		},
		{
			MinLevel:   10,
			MaxLevel:   19,
			FragmentID: 1005,
			PowderID:   1006,
			InfusionID: 1007,
			ManaID:     1008,
		},
		{
			MinLevel:   20,
			MaxLevel:   29,
			FragmentID: 1009,
			PowderID:   1010,
			InfusionID: 1011,
			ManaID:     1012,
		},
		{
			MinLevel:   30,
			MaxLevel:   39,
			FragmentID: 1013,
			PowderID:   1014,
			InfusionID: 1015,
			ManaID:     1016,
		},
		{
			MinLevel:   40,
			MaxLevel:   49,
			FragmentID: 1017,
			PowderID:   1018,
			InfusionID: 1019,
			ManaID:     1020,
		},
		{
			MinLevel:   50,
			MaxLevel:   59,
			FragmentID: 1021,
			PowderID:   1022,
			InfusionID: 1023,
			ManaID:     1024,
		},
		{
			MinLevel:   60,
			MaxLevel:   69,
			FragmentID: 1025,
			PowderID:   1026,
			InfusionID: 1027,
			ManaID:     1028,
		},
		{
			MinLevel:   70,
			MaxLevel:   79,
			FragmentID: 1029,
			PowderID:   1030,
			InfusionID: 1031,
			ManaID:     1032,
		},
		{
			MinLevel:   80,
			MaxLevel:   89,
			FragmentID: 1033,
			PowderID:   1034,
			InfusionID: 1035,
			ManaID:     1036,
		},
		{
			MinLevel:   90,
			MaxLevel:   100,
			FragmentID: 1037,
			PowderID:   1038,
			InfusionID: 1039,
			ManaID:     1040,
		},
	}
	
	return tiers, nil
}

// TODO: When integrating with a real database system, replace this with actual database queries
// Example SQL implementation would look like:
/*
func (db *DatabaseImpl) LoadTransmutingTiers() ([]*TransmutingTier, error) {
	query := `SELECT min_level, max_level, fragment, powder, infusion, mana FROM transmuting ORDER BY min_level`
	
	rows, err := db.connection.Query(query)
	if err != nil {
		return nil, fmt.Errorf("failed to query transmuting tiers: %w", err)
	}
	defer rows.Close()
	
	var tiers []*TransmutingTier
	
	for rows.Next() {
		tier := &TransmutingTier{}
		err := rows.Scan(
			&tier.MinLevel,
			&tier.MaxLevel,
			&tier.FragmentID,
			&tier.PowderID,
			&tier.InfusionID,
			&tier.ManaID,
		)
		if err != nil {
			return nil, fmt.Errorf("failed to scan transmuting tier: %w", err)
		}
		
		tiers = append(tiers, tier)
	}
	
	if err = rows.Err(); err != nil {
		return nil, fmt.Errorf("error iterating transmuting tiers: %w", err)
	}
	
	return tiers, nil
}
*/

// SaveTransmutingTier saves a transmuting tier to the database
func (db *DatabaseImpl) SaveTransmutingTier(tier *TransmutingTier) error {
	// Placeholder implementation
	// In a real implementation:
	// INSERT INTO transmuting (min_level, max_level, fragment, powder, infusion, mana) VALUES (?, ?, ?, ?, ?, ?)
	// OR UPDATE if exists
	
	if tier == nil {
		return fmt.Errorf("tier cannot be nil")
	}
	
	// Validate tier data
	if tier.MinLevel <= 0 || tier.MaxLevel <= 0 {
		return fmt.Errorf("invalid level range: %d-%d", tier.MinLevel, tier.MaxLevel)
	}
	
	if tier.MinLevel > tier.MaxLevel {
		return fmt.Errorf("min level (%d) cannot be greater than max level (%d)", tier.MinLevel, tier.MaxLevel)
	}
	
	if tier.FragmentID <= 0 || tier.PowderID <= 0 || tier.InfusionID <= 0 || tier.ManaID <= 0 {
		return fmt.Errorf("all material IDs must be positive")
	}
	
	// TODO: Actual database save operation
	return nil
}

// DeleteTransmutingTier deletes a transmuting tier from the database
func (db *DatabaseImpl) DeleteTransmutingTier(minLevel, maxLevel int32) error {
	// Placeholder implementation
	// In a real implementation:
	// DELETE FROM transmuting WHERE min_level = ? AND max_level = ?
	
	if minLevel <= 0 || maxLevel <= 0 {
		return fmt.Errorf("invalid level range: %d-%d", minLevel, maxLevel)
	}
	
	// TODO: Actual database delete operation
	return nil
}

// GetTransmutingTierByLevel gets a specific transmuting tier by level range
func (db *DatabaseImpl) GetTransmutingTierByLevel(itemLevel int32) (*TransmutingTier, error) {
	// Placeholder implementation
	// In a real implementation:
	// SELECT min_level, max_level, fragment, powder, infusion, mana FROM transmuting WHERE min_level <= ? AND max_level >= ?
	
	tiers, err := db.LoadTransmutingTiers()
	if err != nil {
		return nil, err
	}
	
	for _, tier := range tiers {
		if tier.MinLevel <= itemLevel && tier.MaxLevel >= itemLevel {
			return tier, nil
		}
	}
	
	return nil, fmt.Errorf("no transmuting tier found for level %d", itemLevel)
}

// UpdateTransmutingTier updates an existing transmuting tier
func (db *DatabaseImpl) UpdateTransmutingTier(oldMinLevel, oldMaxLevel int32, newTier *TransmutingTier) error {
	// Placeholder implementation
	// In a real implementation:
	// UPDATE transmuting SET min_level=?, max_level=?, fragment=?, powder=?, infusion=?, mana=? WHERE min_level=? AND max_level=?
	
	if newTier == nil {
		return fmt.Errorf("new tier cannot be nil")
	}
	
	// Validate the new tier
	if err := db.SaveTransmutingTier(newTier); err != nil {
		return fmt.Errorf("invalid new tier data: %w", err)
	}
	
	// TODO: Actual database update operation
	return nil
}

// TransmutingTierExists checks if a transmuting tier exists for the given level range
func (db *DatabaseImpl) TransmutingTierExists(minLevel, maxLevel int32) (bool, error) {
	// Placeholder implementation
	// In a real implementation:
	// SELECT COUNT(*) FROM transmuting WHERE min_level = ? AND max_level = ?
	
	tiers, err := db.LoadTransmutingTiers()
	if err != nil {
		return false, err
	}
	
	for _, tier := range tiers {
		if tier.MinLevel == minLevel && tier.MaxLevel == maxLevel {
			return true, nil
		}
	}
	
	return false, nil
}