package contract

import (
	"errors"
	"log"
	"net/http"
	"time"

	"github.com/jinzhu/gorm"
	"github.com/lib/pq"
	"gitlab.com/pactual1/backend/models"
	"gitlab.com/pactual1/backend/shared"
)


func GetContracts(status string, companyName string, companyAddress string,
	companyEmail string, companyPhone string, startTime *time.Time, endTime *time.Time,
	contractName string, deviceIDs []int64, contractID int,  dateCreated *time.Time, limit, offset int) ([]models.Contract, int64, int, error) {

	var contracts []models.Contract
	db := shared.GetDb()
	countDb := db

	// Define custom fields to be selected, varies based on joined tables
	customFields := "contracts.*, array_length(contracts.device_ids, 1) as number_of_devices"

	// Search by Status
	if status != "" {
		db = db.Where("contracts.status = ?", status)
		countDb = countDb.Where("contracts.status = ?", status)
	}

	// Search by Company Fields
	db = db.Joins("left join companies on companies.id = contracts.buyer_id")
	countDb = countDb.Joins("left join companies on companies.id = contracts.buyer_id")
	customFields += ", companies.name as buyer_name"
	if companyName != "" {
		db = db.Where("companies.name LIKE ?", "%"+companyName+"%")
		countDb = countDb.Where("companies.name LIKE ?", "%"+companyName+"%")
	}
	if companyAddress != "" {
		db = db.Where("companies.address LIKE ?", "%"+companyAddress+"%")
		countDb = countDb.Where("companies.address LIKE ?", "%"+companyAddress+"%")
	}
	if companyEmail != "" {
		db = db.Where("companies.email LIKE ?", "%"+companyEmail+"%")
		countDb = countDb.Where("companies.email LIKE ?", "%"+companyEmail+"%")
	}
	if companyPhone != "" {
		db = db.Where("companies.phone LIKE ?", "%"+companyPhone+"%")
		countDb = countDb.Where("companies.phone LIKE ?", "%"+companyPhone+"%")
	}

	// Search by Contract Name
	if contractName != "" {
		db = db.Where("contracts.name LIKE ?", "%"+contractName+"%")
		countDb = countDb.Where("contracts.name LIKE ?", "%"+contractName+"%")
	}

	// Search by Contract Name
	if contractID != 0{
		db = db.Where("contracts.id = ?", contractID)
		countDb = countDb.Where("contracts.id = ?", contractID)
	}

	// Search by Start Time and End Time
	if startTime != nil  &&!startTime.IsZero() {
		db = db.Where("start_time >= ?", startTime)
		countDb = countDb.Where("start_time >= ?", startTime)
	}

	if endTime != nil && !startTime.IsZero() {
		db = db.Where("end_time <= ?", endTime)
		countDb = countDb.Where("end_time <= ?", endTime)
	}

	if dateCreated != nil && !dateCreated.IsZero() {
		db = db.Where("contracts.created_at = ?", dateCreated)
		countDb = countDb.Where("created_at = ?", dateCreated)
	}


	// Search by Device IDs
	if len(deviceIDs) > 0 {
		db = db.Where("device_ids && ?", pq.Array(deviceIDs))
		countDb = countDb.Where("device_ids && ?", pq.Array(deviceIDs))
	}

	// Fetch total count of filtered records
	var total int64
	if err := countDb.Model(&models.Contract{}).Count(&total).Error; err != nil {
		log.Printf("GetContracts Error: Database error: %v", err)
		return contracts, total, http.StatusInternalServerError, err
	}

	// Fetch contracts with custom fields
	if err := db.Select(customFields).
		Order("created_at desc").
		Limit(limit).
		Offset(offset).
		Find(&contracts).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			log.Printf("GetContracts Error: No contracts found: %v", err)
			return contracts, total, http.StatusNotFound, err
		} else {
			log.Printf("GetContracts Error: Database error: %v", err)
			return contracts, total, http.StatusInternalServerError, err
		}
	}

	return contracts, total, http.StatusOK, nil
}




func GetContractByID(contractID uint64) (models.Contract, int ,error) {

	// Fetch the contract creation date based on contractID
	var contract models.Contract
	if err := shared.GetDb().Where("id = ?", contractID).First(&contract).Error; err != nil {
		log.Printf("GetDeviceData Error: Could not fetch contract: %v", err)
		return contract, http.StatusInternalServerError, err
	}
	
	return  contract ,  http.StatusOK, nil

}