package repository

import (
	"strings"

	"github.com/wmms/wmms/internal/model"
	"github.com/wmms/wmms/pkg/database"
)

type MaterialLogRepo struct{}

func NewMaterialLogRepo() *MaterialLogRepo {
	return &MaterialLogRepo{}
}

// normalizeEndDate ensures endDate has a time component for proper date range filtering
func normalizeEndDate(endDate string) string {
	if endDate == "" {
		return ""
	}
	// If already contains a time component (has : in time part like 23:59:59), return as-is
	if strings.Contains(endDate, " ") && strings.Contains(strings.Split(endDate, " ")[1], ":") {
		return endDate
	}
	// Append end of day time
	return endDate + " 23:59:59"
}

func (r *MaterialLogRepo) Create(log *model.MaterialLog) error {
	query := `INSERT INTO material_logs (operation_type, material_id, old_value, new_value, operator, description) VALUES (?, ?, ?, ?, ?, ?)`
	result, err := database.DB.Exec(query, log.OperationType, log.MaterialID, log.OldValue, log.NewValue, log.Operator, log.Description)
	if err != nil {
		return err
	}
	id, err := result.LastInsertId()
	if err != nil {
		return err
	}
	log.ID = id
	return nil
}

func (r *MaterialLogRepo) List(operationType, materialId string, startDate, endDate string, limit, offset int) ([]model.MaterialLog, int64, error) {
	countQuery := `SELECT COUNT(*) FROM material_logs WHERE 1=1`
	var countArgs []interface{}

	if operationType != "" {
		countQuery += ` AND operation_type = ?`
		countArgs = append(countArgs, operationType)
	}
	if materialId != "" {
		countQuery += ` AND material_id = ?`
		countArgs = append(countArgs, materialId)
	}
	if startDate != "" {
		countQuery += ` AND created_at >= ?`
		countArgs = append(countArgs, startDate)
	}
	if endDate != "" {
		countQuery += ` AND created_at <= ?`
		countArgs = append(countArgs, normalizeEndDate(endDate))
	}

	var total int64
	err := database.DB.QueryRow(countQuery, countArgs...).Scan(&total)
	if err != nil {
		return nil, 0, err
	}

	query := `SELECT id, operation_type, material_id, old_value, new_value, operator, description, created_at FROM material_logs WHERE 1=1`
	var args []interface{}

	if operationType != "" {
		query += ` AND operation_type = ?`
		args = append(args, operationType)
	}
	if materialId != "" {
		query += ` AND material_id = ?`
		args = append(args, materialId)
	}
	if startDate != "" {
		query += ` AND created_at >= ?`
		args = append(args, startDate)
	}
	if endDate != "" {
		query += ` AND created_at <= ?`
		args = append(args, normalizeEndDate(endDate))
	}
	query += ` ORDER BY id DESC LIMIT ? OFFSET ?`
	args = append(args, limit, offset)

	rows, err := database.DB.Query(query, args...)
	if err != nil {
		return nil, 0, err
	}
	defer rows.Close()

	var logs []model.MaterialLog
	for rows.Next() {
		var log model.MaterialLog
		var oldValue, newValue []byte
		err := rows.Scan(&log.ID, &log.OperationType, &log.MaterialID, &oldValue, &newValue, &log.Operator, &log.Description, &log.CreatedAt)
		if err != nil {
			return nil, 0, err
		}
		if oldValue != nil {
			log.OldValue = string(oldValue)
		}
		if newValue != nil {
			log.NewValue = string(newValue)
		}
		logs = append(logs, log)
	}
	return logs, total, nil
}

func (r *MaterialLogRepo) GetByMaterialID(materialID int64) ([]model.MaterialLog, error) {
	query := `SELECT id, operation_type, material_id, old_value, new_value, operator, description, created_at FROM material_logs WHERE material_id = ? ORDER BY id DESC`
	rows, err := database.DB.Query(query, materialID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var logs []model.MaterialLog
	for rows.Next() {
		var log model.MaterialLog
		var oldValue, newValue []byte
		err := rows.Scan(&log.ID, &log.OperationType, &log.MaterialID, &oldValue, &newValue, &log.Operator, &log.Description, &log.CreatedAt)
		if err != nil {
			return nil, err
		}
		if oldValue != nil {
			log.OldValue = string(oldValue)
		}
		if newValue != nil {
			log.NewValue = string(newValue)
		}
		logs = append(logs, log)
	}
	return logs, nil
}