package v1

import (
	"net/http"

	"github.com/gin-gonic/gin"

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

// BannerHandler handles Platform API banner endpoints (super-admin CRUD)
// and account-scoped read-only ListActive endpoint.
// Reference: Chatwoot Platform::Api::V1::BannersController — super-admin CRUD,
// and api/v1/accounts/:account_id/banners — read-only active banners.
type BannerHandler struct {
	svc *service.BannerService
}

// NewBannerHandler creates a new BannerHandler with service injection.
func NewBannerHandler(svc *service.BannerService) *BannerHandler {
	return &BannerHandler{svc: svc}
}

// --- Platform (super-admin) Banner endpoints ---
// Reference: Chatwoot Platform::Api::V1::BannersController

// List retrieves all banners, paginated (super-admin).
// GET /platform/api/v1/banners
func (h *BannerHandler) List(c *gin.Context) {
	pg := pagination.Parse(c)
	banners, total, err := h.svc.List(c.Request.Context(), pg.Offset, pg.PerPage)
	if err != nil {
		handleServiceError(c, err)
		return
	}
	response.OKWithMeta(c, banners, pg.Page, pg.PerPage, total)
}

// Get retrieves a single banner by ID (super-admin).
// GET /platform/api/v1/banners/:id
func (h *BannerHandler) Get(c *gin.Context) {
	id, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid banner ID")
		return
	}
	banner, svcErr := h.svc.Get(c.Request.Context(), id)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}
	response.OK(c, banner)
}

// Create creates a new banner (super-admin).
// POST /platform/api/v1/banners
func (h *BannerHandler) Create(c *gin.Context) {
	var req struct {
		Title      string `json:"title" binding:"required"`
		Content    string `json:"content" binding:"required"`
		Active     bool   `json:"active"`
		BannerType string `json:"banner_type" binding:"required"`
		CreatedBy  *uint  `json:"created_by"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	banner := &model.Banner{
		Title:      req.Title,
		Content:    req.Content,
		Active:     req.Active,
		BannerType: req.BannerType,
		CreatedBy:  req.CreatedBy,
	}

	if svcErr := h.svc.Create(c.Request.Context(), banner); svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}
	response.Created(c, banner)
}

// Update patches an existing banner (super-admin).
// PUT /platform/api/v1/banners/:id
func (h *BannerHandler) Update(c *gin.Context) {
	id, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid banner ID")
		return
	}

	var req map[string]interface{}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	if svcErr := h.svc.Update(c.Request.Context(), id, req); svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	// Return updated banner
	banner, svcErr := h.svc.Get(c.Request.Context(), id)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}
	response.OK(c, banner)
}

// Delete soft-deletes a banner (super-admin).
// DELETE /platform/api/v1/banners/:id
func (h *BannerHandler) Delete(c *gin.Context) {
	id, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid banner ID")
		return
	}

	if svcErr := h.svc.Delete(c.Request.Context(), id); svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}
	response.NoContent(c)
}

// --- Account-scoped (read-only) Banner endpoint ---
// Reference: Chatwoot api/v1/accounts/:account_id/banners — only active banners

// ListActive returns all active banners visible to account users.
// GET /api/v1/accounts/:account_id/banners
func (h *BannerHandler) ListActive(c *gin.Context) {
	banners, err := h.svc.ListActive(c.Request.Context())
	if err != nil {
		handleServiceError(c, err)
		return
	}
	response.OK(c, banners)
}