package handlers

import (
	"slices"

	"git.odit.services/lfk/document-server/models"
	"github.com/gofiber/fiber/v2"
)

// GenerateContract godoc
//
//	@Summary		Generate a contract
//	@Description	Generate a contract based on the provided data
//	@Tags			pdfs
//	@Accept			json
//	@Param			data	body	models.ContractRequest	true	"Contract data"
//	@Produce		application/pdf
//	@Security		ApiKeyAuth
//	@Router			/v1/pdfs/contracts [post]
func (h *DefaultHandler) GenerateContract(c *fiber.Ctx) error {

	logger := h.Logger.Named("GenerateContract")

	contract := new(models.ContractRequest)
	if err := c.BodyParser(contract); err != nil {
		logger.Errorw("Invalid request", "error", err)
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
			"error": err.Error(),
		})
	}
	if !slices.Contains([]string{"en", "de"}, contract.Locale) {
		logger.Errorw("Invalid locale", "locale", contract.Locale)
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
			"error": "Invalid locale",
		})
	}

	logger = logger.With("locale", contract.Locale)

	templateString, err := h.StaticService.GetTemplate(contract.Locale, "contract")
	if err != nil {
		logger.Errorw("Template not found", "error", err)
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
			"error": "Template not found",
		})
	}
	template, err := h.Templater.StringToTemplate(templateString)
	if err != nil {
		logger.Errorw("Error parsing template", "error", err)
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
			"error": err.Error(),
		})
	}

	genConfig := &models.ContractTemplateOptions{
		Runners:              repeatRunnerArrayItems(contract.Runners, 2),
		CurrencySymbol:       h.Config.CurrencySymbol,
		Disclaimer:           h.Config.SponosringDisclaimer,
		ReceiptMinimumAmount: h.Config.SponsoringReceiptMinimum,
		EventName:            h.Config.EventName,
		BarcodeFormat:        h.Config.SponsoringBarcodeFormat,
		BarcodePrefix:        h.Config.SponsoringBarcodePrefix,
	}

	logger.Info("Generating contract html")
	result, err := h.Templater.Execute(template, genConfig)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
			"error": err.Error(),
		})
	}
	logger.Info("Generated contract html")

	logger.Info("Converting html to pdf")
	pdf, err := h.Converter.ToPdf(result, "a5", true)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
			"error": err.Error(),
		})
	}
	logger.Info("Converted html to pdf")

	c.Set(fiber.HeaderContentType, "application/pdf")
	c.Set(fiber.HeaderContentDisposition, "attachment; filename=runner-contracts.pdf")
	return c.Send(pdf)
}

func repeatRunnerArrayItems(runners []models.Runner, duplicates int) []models.Runner {
	var duplicatedRunners []models.Runner
	for _, runner := range runners {
		for i := 0; i < duplicates; i++ {
			duplicatedRunners = append(duplicatedRunners, runner)
		}
	}
	return duplicatedRunners
}