package services

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"strings"
	"time"

	"github.com/ydn/yourdreamnamehere/internal/config"
	"github.com/ydn/yourdreamnamehere/internal/models"
)

type DolibarrService struct {
	db     *gorm.DB
	config *config.Config
	client *http.Client
}

type DolibarrCustomer struct {
	ID           int    `json:"id"`
	Name         string `json:"name"`
	Email        string `json:"email"`
	Phone        string `json:"phone"`
	Address      string `json:"address"`
	Zip          string `json:"zip"`
	Town         string `json:"town"`
	Country      string `json:"country"`
	CustomerCode string `json:"customer_code"`
}

type DolibarrInvoice struct {
	ID         int     `json:"id"`
	Ref        string  `json:"ref"`
	Total      float64 `json:"total"`
	Status     string  `json:"status"`
	Date       string  `json:"date"`
	CustomerID int     `json:"socid"`
}

type DolibarrProduct struct {
	ID          int     `json:"id"`
	Ref         string  `json:"ref"`
	Label       string  `json:"label"`
	Description string  `json:"description"`
	Price       float64 `json:"price"`
}

func NewDolibarrService(db *gorm.DB, config *config.Config) *DolibarrService {
	return &DolibarrService{
		db:     db,
		config: config,
		client: &http.Client{
			Timeout: 30 * time.Second,
		},
	}
}

func (s *DolibarrService) CreateCustomer(customer *models.Customer) (*DolibarrCustomer, error) {
	// Prepare customer data for Dolibarr
	doliCustomer := map[string]interface{}{
		"name":         customer.Email, // Use email as name since we don't have company name
		"email":        customer.Email,
		"client":       1,
		"fournisseur":  0,
		"customer_code": fmt.Sprintf("CU%06d", time.Now().Unix() % 999999),
		"status":       1,
	}

	jsonData, err := json.Marshal(doliCustomer)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal customer data: %w", err)
	}

	// Make API request to Dolibarr
	req, err := http.NewRequest("POST", s.config.Dolibarr.URL+"/api/index.php/thirdparties", strings.NewReader(string(jsonData)))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("DOLAPIKEY", s.config.Dolibarr.APIToken)

	resp, err := s.client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("failed to make request: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return nil, fmt.Errorf("Dolibarr API error: %d - %s", resp.StatusCode, string(body))
	}

	var createdCustomer DolibarrCustomer
	if err := json.NewDecoder(resp.Body).Decode(&createdCustomer); err != nil {
		return nil, fmt.Errorf("failed to decode response: %w", err)
	}

	log.Printf("Created customer in Dolibarr: %d", createdCustomer.ID)
	return &createdCustomer, nil
}

func (s *DolibarrService) CreateInvoice(customerID int, amount float64, description string) (*DolibarrInvoice, error) {
	// Prepare invoice data
	doliInvoice := map[string]interface{}{
		"socid":      customerID,
		"type":       0, // Standard invoice
		"date":       time.Now().Format("2006-01-02"),
		"date_lim_reglement": time.Now().AddDate(0, 1, 0).Format("2006-01-02"), // Due in 1 month
		"cond_reglement_code": "RECEP",
		"mode_reglement_code": "CB",
		"note_public": description,
		"lines": []map[string]interface{}{
			{
				"desc":          description,
				"subprice":      amount,
				"qty":           1,
				"tva_tx":        0.0, // No tax for B2B SaaS
				"product_type":  1, // Service
			},
		},
	}

	jsonData, err := json.Marshal(doliInvoice)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal invoice data: %w", err)
	}

	// Make API request
	req, err := http.NewRequest("POST", s.config.Dolibarr.URL+"/api/index.php/invoices", strings.NewReader(string(jsonData)))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("DOLAPIKEY", s.config.Dolibarr.APIToken)

	resp, err := s.client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("failed to make request: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return nil, fmt.Errorf("Dolibarr API error: %d - %s", resp.StatusCode, string(body))
	}

	var createdInvoice DolibarrInvoice
	if err := json.NewDecoder(resp.Body).Decode(&createdInvoice); err != nil {
		return nil, fmt.Errorf("failed to decode response: %w", err)
	}

	// Validate the invoice
	validateReq, err := http.NewRequest("POST", fmt.Sprintf("%s/api/index.php/invoices/%d/validate", s.config.Dolibarr.URL, createdInvoice.ID), strings.NewReader("{}"))
	if err != nil {
		return nil, fmt.Errorf("failed to create validation request: %w", err)
	}

	validateReq.Header.Set("Content-Type", "application/json")
	validateReq.Header.Set("DOLAPIKEY", s.config.Dolibarr.APIToken)

	validateResp, err := s.client.Do(validateReq)
	if err != nil {
		log.Printf("Warning: failed to validate invoice: %v", err)
	} else {
		validateResp.Body.Close()
	}

	log.Printf("Created invoice in Dolibarr: %d for customer: %d", createdInvoice.ID, customerID)
	return &createdInvoice, nil
}

func (s *DolibarrService) GetCustomerInvoices(dolibarrCustomerID int) ([]DolibarrInvoice, error) {
	req, err := http.NewRequest("GET", fmt.Sprintf("%s/api/index.php/invoices?socid=%d", s.config.Dolibarr.URL, dolibarrCustomerID), nil)
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("DOLAPIKEY", s.config.Dolibarr.APIToken)

	resp, err := s.client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("failed to make request: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return nil, fmt.Errorf("Dolibarr API error: %d - %s", resp.StatusCode, string(body))
	}

	var invoices []DolibarrInvoice
	if err := json.NewDecoder(resp.Body).Decode(&invoices); err != nil {
		return nil, fmt.Errorf("failed to decode response: %w", err)
	}

	return invoices, nil
}

func (s *DolibarrService) CreateOrUpdateProduct(productCode, label, description string, price float64) error {
	// First, try to find existing product
	req, err := http.NewRequest("GET", fmt.Sprintf("%s/api/index.php/products?ref=%s", s.config.Dolibarr.URL, productCode), nil)
	if err != nil {
		return fmt.Errorf("failed to create search request: %w", err)
	}

	req.Header.Set("DOLAPIKEY", s.config.Dolibarr.APIToken)

	resp, err := s.client.Do(req)
	if err != nil {
		return fmt.Errorf("failed to search for product: %w", err)
	}
	resp.Body.Close()

	if resp.StatusCode == http.StatusOK {
		// Product exists, update it
		log.Printf("Product %s already exists in Dolibarr", productCode)
		return nil
	}

	// Create new product
	product := map[string]interface{}{
		"ref":         productCode,
		"label":       label,
		"description": description,
		"price":       price,
		"type":        1, // Service
		"status":      1, // On sale
		"tosell":      1, // Can be sold
	}

	jsonData, err := json.Marshal(product)
	if err != nil {
		return fmt.Errorf("failed to marshal product data: %w", err)
	}

	req, err = http.NewRequest("POST", s.config.Dolibarr.URL+"/api/index.php/products", strings.NewReader(string(jsonData)))
	if err != nil {
		return fmt.Errorf("failed to create product request: %w", err)
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("DOLAPIKEY", s.config.Dolibarr.APIToken)

	resp, err = s.client.Do(req)
	if err != nil {
		return fmt.Errorf("failed to create product: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return fmt.Errorf("Dolibarr API error: %d - %s", resp.StatusCode, string(body))
	}

	log.Printf("Created product in Dolibarr: %s", productCode)
	return nil
}