package v1

import (
	"errors"
	"net/http"

	"github.com/gin-gonic/gin"

	"github.com/gochat/gochat/internal/service"
	"github.com/gochat/gochat/pkg/response"
)

// InboxCsatTemplateHandler handles CSAT template endpoints for inboxes.
// Reference: Chatwoot app/controllers/api/v1/accounts/inboxes/inbox_csat_templates_controller.rb
// CSAT template is a singular resource per inbox: show, create, and analyze actions.
type InboxCsatTemplateHandler struct {
	svc *service.CsatTemplateService
}

// NewInboxCsatTemplateHandler creates a new InboxCsatTemplateHandler.
func NewInboxCsatTemplateHandler(svc *service.CsatTemplateService) *InboxCsatTemplateHandler {
	return &InboxCsatTemplateHandler{svc: svc}
}

// Show retrieves the CSAT template status for an inbox.
// GET /api/v1/accounts/:account_id/inboxes/:inbox_id/csat_template
// If no template exists, returns an empty object (Chatwoot returns nil in this case).
func (h *InboxCsatTemplateHandler) Show(c *gin.Context) {
	inboxID, err := parseUintParam(c, "inbox_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid inbox_id")
		return
	}

	status, svcErr := h.svc.ShowTemplateStatusResult(c.Request.Context(), inboxID)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}
	response.OK(c, status)
}

// Create creates or updates a CSAT template for an inbox.
// POST /api/v1/accounts/:account_id/inboxes/:inbox_id/csat_template
// Body: { "message": "..." }
func (h *InboxCsatTemplateHandler) Create(c *gin.Context) {
	inboxID, err := parseUintParam(c, "inbox_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid inbox_id")
		return
	}

	req, err := bindCreateCsatTemplateRequest(c)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid request body")
		return
	}

	template, svcErr := h.svc.CreateTemplate(c.Request.Context(), inboxID, req)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	c.JSON(http.StatusCreated, template)
}

// Analyze analyzes a CSAT template message for quality.
// POST /api/v1/accounts/:account_id/inboxes/:inbox_id/csat_template/analyze
// Body: { "message": "..." }
func (h *InboxCsatTemplateHandler) Analyze(c *gin.Context) {
	inboxID, err := parseUintParam(c, "inbox_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid inbox_id")
		return
	}

	req, err := bindAnalyzeCsatTemplateRequest(c)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid request body")
		return
	}

	result, svcErr := h.svc.AnalyzeTemplate(c.Request.Context(), inboxID, req)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, result)
}

func bindCreateCsatTemplateRequest(c *gin.Context) (service.CreateCsatTemplateRequest, error) {
	var body struct {
		Message    string                            `json:"message"`
		ButtonText string                            `json:"button_text"`
		Language   string                            `json:"language"`
		Template   service.CreateCsatTemplateRequest `json:"template"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		return service.CreateCsatTemplateRequest{}, err
	}
	req := body.Template
	if req.Message == "" {
		req.Message = body.Message
	}
	if req.ButtonText == "" {
		req.ButtonText = body.ButtonText
	}
	if req.Language == "" {
		req.Language = body.Language
	}
	if req.Message == "" {
		return req, errors.New("message is required")
	}
	return req, nil
}

func bindAnalyzeCsatTemplateRequest(c *gin.Context) (service.AnalyzeCsatTemplateRequest, error) {
	var body struct {
		Message    string                             `json:"message"`
		ButtonText string                             `json:"button_text"`
		Language   string                             `json:"language"`
		Template   service.AnalyzeCsatTemplateRequest `json:"template"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		return service.AnalyzeCsatTemplateRequest{}, err
	}
	req := body.Template
	if req.Message == "" {
		req.Message = body.Message
	}
	if req.ButtonText == "" {
		req.ButtonText = body.ButtonText
	}
	if req.Language == "" {
		req.Language = body.Language
	}
	if req.Message == "" {
		return req, errors.New("message is required")
	}
	return req, nil
}