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package controllers

import (
	"strconv"

	"abdanhafidz.com/go-boilerplate/models/dto"
	"abdanhafidz.com/go-boilerplate/services"
	"github.com/gin-gonic/gin"
)

type EventController interface {
	GetEvents(ctx *gin.Context)
	GetEventDetail(ctx *gin.Context)
	CreateEvent(ctx *gin.Context)
	GetMyEvents(ctx *gin.Context)
	UpdateEvent(ctx *gin.Context)
	DeleteEvent(ctx *gin.Context)
	AddEventPackage(ctx *gin.Context)
	UpdateEventPackage(ctx *gin.Context)
	DeleteEventPackage(ctx *gin.Context)
	AddEventInstructor(ctx *gin.Context)
	RemoveEventInstructor(ctx *gin.Context)
	GetPendingEvents(ctx *gin.Context)
	ApproveEvent(ctx *gin.Context)
	RejectEvent(ctx *gin.Context)
}

type eventController struct {
	eventService services.EventService
}

func NewEventController(eventService services.EventService) EventController {
	return &eventController{eventService: eventService}
}

// GetEvents godoc
// @Summary      List approved events
// @Description  Returns a paginated list of approved events visible to members.
// @Tags         Events
// @Produce      json
// @Param        page    query  int     false  "Page (default: 1)"
// @Param        limit   query  int     false  "Limit (default: 10)"
// @Param        search  query  string  false  "Search by title"
// @Success      200  {object}  dto.EventListResponse
// @Security     BearerAuth
// @Router       /api/v1/events [get]
func (c *eventController) GetEvents(ctx *gin.Context) {
	page, _ := strconv.Atoi(ctx.DefaultQuery("page", "1"))
	limit, _ := strconv.Atoi(ctx.DefaultQuery("limit", "10"))
	search := ctx.Query("search")

	res, err := c.eventService.GetEvents(ctx.Request.Context(), page, limit, search)
	ResponseJSON(ctx, "", res, err)
}

// GetEventDetail godoc
// @Summary      Get event detail
// @Description  Returns full event details for the member-facing detail page.
// @Tags         Events
// @Produce      json
// @Param        event_id  path  string  true  "Event ID"
// @Success      200  {object}  dto.EventDetailResponse
// @Failure      404  {object}  dto.ErrorResponse
// @Security     BearerAuth
// @Router       /api/v1/events/{event_id} [get]
func (c *eventController) GetEventDetail(ctx *gin.Context) {
	eventID := ctx.Param("event_id")
	userID := ParseUserId(ctx)

	res, err := c.eventService.GetEventDetail(ctx.Request.Context(), eventID, userID)
	ResponseJSON(ctx, "", res, err)
}

// CreateEvent godoc
// @Summary      Create an event
// @Description  Allows an instructor (DI) to create a new event. Starts in PENDING_APPROVAL status.
// @Tags         Events
// @Accept       json
// @Produce      json
// @Param        request  body  dto.CreateEventRequest  true  "Event Data"
// @Success      201  {object}  entities.Event
// @Failure      400  {object}  dto.ErrorResponse
// @Failure      401  {object}  dto.ErrorResponse
// @Security     BearerAuth
// @Router       /api/v1/events [post]
func (c *eventController) CreateEvent(ctx *gin.Context) {
	userID := ParseUserId(ctx)
	if userID == "" {
		return
	}
	req, err := RequestJSON[dto.CreateEventRequest](ctx)
	if err != nil {
		return
	}
	res, err := c.eventService.CreateEvent(ctx.Request.Context(), userID, req)
	if err != nil {
		ResponseJSON(ctx, req, res, err)
		return
	}
	ctx.JSON(201, gin.H{"success": true, "message": "Event created successfully. Pending approval.", "data": res})
}

// GetMyEvents godoc
// @Summary      Get my events
// @Description  Returns a paginated list of events created by the authenticated instructor.
// @Tags         Events
// @Produce      json
// @Param        page   query  int  false  "Page (default: 1)"
// @Param        limit  query  int  false  "Limit (default: 10)"
// @Success      200  {object}  dto.EventListResponse
// @Security     BearerAuth
// @Router       /api/v1/events/me [get]
func (c *eventController) GetMyEvents(ctx *gin.Context) {
	userID := ParseUserId(ctx)
	if userID == "" {
		return
	}
	page, _ := strconv.Atoi(ctx.DefaultQuery("page", "1"))
	limit, _ := strconv.Atoi(ctx.DefaultQuery("limit", "10"))

	res, err := c.eventService.GetMyEvents(ctx.Request.Context(), userID, page, limit)
	ResponseJSON(ctx, "", res, err)
}

// UpdateEvent godoc
// @Summary      Update an event
// @Description  Partially update an event owned by the authenticated instructor.
// @Tags         Events
// @Accept       json
// @Produce      json
// @Param        event_id  path  string                 true  "Event ID"
// @Param        request   body  dto.UpdateEventRequest  true  "Fields to update"
// @Success      200  {object}  entities.Event
// @Failure      400  {object}  dto.ErrorResponse
// @Failure      403  {object}  dto.ErrorResponse
// @Security     BearerAuth
// @Router       /api/v1/events/{event_id} [put]
func (c *eventController) UpdateEvent(ctx *gin.Context) {
	userID := ParseUserId(ctx)
	if userID == "" {
		return
	}
	eventID := ctx.Param("event_id")
	req, err := RequestJSON[dto.UpdateEventRequest](ctx)
	if err != nil {
		return
	}
	res, err := c.eventService.UpdateEvent(ctx.Request.Context(), userID, eventID, req)
	if err != nil {
		ResponseJSON(ctx, req, res, err)
		return
	}
	ctx.JSON(200, gin.H{"success": true, "message": "Event updated successfully", "data": res})
}

// DeleteEvent godoc
// @Summary      Delete an event
// @Description  Delete an event owned by the authenticated instructor.
// @Tags         Events
// @Produce      json
// @Param        event_id  path  string  true  "Event ID"
// @Success      200  {object}  map[string]interface{}
// @Failure      403  {object}  dto.ErrorResponse
// @Failure      404  {object}  dto.ErrorResponse
// @Security     BearerAuth
// @Router       /api/v1/events/{event_id} [delete]
func (c *eventController) DeleteEvent(ctx *gin.Context) {
	userID := ParseUserId(ctx)
	if userID == "" {
		return
	}
	eventID := ctx.Param("event_id")
	err := c.eventService.DeleteEvent(ctx.Request.Context(), userID, eventID)
	if err != nil {
		ctx.JSON(400, gin.H{"success": false, "message": err.Error()})
		return
	}
	ctx.JSON(200, gin.H{"success": true, "message": "Event deleted successfully"})
}

// AddEventPackage godoc
// @Summary      Add package to event
// @Description  Add a ticket package to an event. Only the event owner can do this.
// @Tags         Events
// @Accept       json
// @Produce      json
// @Param        event_id  path  string                       true  "Event ID"
// @Param        request   body  dto.CreateEventPackageRequest  true  "Package Data"
// @Success      201  {object}  entities.EventPackage
// @Security     BearerAuth
// @Router       /api/v1/events/{event_id}/packages [post]
func (c *eventController) AddEventPackage(ctx *gin.Context) {
	userID := ParseUserId(ctx)
	if userID == "" {
		return
	}
	eventID := ctx.Param("event_id")
	req, err := RequestJSON[dto.CreateEventPackageRequest](ctx)
	if err != nil {
		return
	}
	res, err := c.eventService.AddEventPackage(ctx.Request.Context(), userID, eventID, req)
	if err != nil {
		ResponseJSON(ctx, req, res, err)
		return
	}
	ctx.JSON(201, gin.H{"success": true, "message": "Package added successfully", "data": res})
}

// UpdateEventPackage godoc
// @Summary      Update an event package
// @Description  Partially update a ticket package. Only the event owner can do this.
// @Tags         Events
// @Accept       json
// @Produce      json
// @Param        package_id  path  string                       true  "Package ID"
// @Param        request     body  dto.UpdateEventPackageRequest  true  "Fields to update"
// @Success      200  {object}  entities.EventPackage
// @Security     BearerAuth
// @Router       /api/v1/events/packages/{package_id} [put]
func (c *eventController) UpdateEventPackage(ctx *gin.Context) {
	userID := ParseUserId(ctx)
	if userID == "" {
		return
	}
	packageID := ctx.Param("package_id")
	req, err := RequestJSON[dto.UpdateEventPackageRequest](ctx)
	if err != nil {
		return
	}
	res, err := c.eventService.UpdateEventPackage(ctx.Request.Context(), userID, packageID, req)
	if err != nil {
		ResponseJSON(ctx, req, res, err)
		return
	}
	ctx.JSON(200, gin.H{"success": true, "message": "Package updated successfully", "data": res})
}

// DeleteEventPackage godoc
// @Summary      Delete an event package
// @Description  Remove a ticket package from an event. Only the event owner can do this.
// @Tags         Events
// @Produce      json
// @Param        package_id  path  string  true  "Package ID"
// @Success      200  {object}  map[string]interface{}
// @Security     BearerAuth
// @Router       /api/v1/events/packages/{package_id} [delete]
func (c *eventController) DeleteEventPackage(ctx *gin.Context) {
	userID := ParseUserId(ctx)
	if userID == "" {
		return
	}
	packageID := ctx.Param("package_id")
	err := c.eventService.DeleteEventPackage(ctx.Request.Context(), userID, packageID)
	if err != nil {
		ctx.JSON(400, gin.H{"success": false, "message": err.Error()})
		return
	}
	ctx.JSON(200, gin.H{"success": true, "message": "Package deleted successfully"})
}

// AddEventInstructor godoc
// @Summary      Add instructor to event
// @Description  Link a partner instructor to an event. Only the event owner can do this.
// @Tags         Events
// @Accept       json
// @Produce      json
// @Param        event_id  path  string                       true  "Event ID"
// @Param        request   body  dto.AddEventInstructorRequest  true  "Instructor Data"
// @Success      201  {object}  entities.EventInstructor
// @Security     BearerAuth
// @Router       /api/v1/events/{event_id}/instructors [post]
func (c *eventController) AddEventInstructor(ctx *gin.Context) {
	userID := ParseUserId(ctx)
	if userID == "" {
		return
	}
	eventID := ctx.Param("event_id")
	req, err := RequestJSON[dto.AddEventInstructorRequest](ctx)
	if err != nil {
		return
	}
	res, err := c.eventService.AddEventInstructor(ctx.Request.Context(), userID, eventID, req)
	if err != nil {
		ResponseJSON(ctx, req, res, err)
		return
	}
	ctx.JSON(201, gin.H{"success": true, "message": "Instructor added successfully", "data": res})
}

// RemoveEventInstructor godoc
// @Summary      Remove instructor from event
// @Description  Unlink a partner instructor from an event. Only the event owner can do this.
// @Tags         Events
// @Produce      json
// @Param        event_id       path  string  true  "Event ID"
// @Param        instructor_id  path  string  true  "Instructor ID"
// @Success      200  {object}  map[string]interface{}
// @Security     BearerAuth
// @Router       /api/v1/events/{event_id}/instructors/{instructor_id} [delete]
func (c *eventController) RemoveEventInstructor(ctx *gin.Context) {
	userID := ParseUserId(ctx)
	if userID == "" {
		return
	}
	eventID := ctx.Param("event_id")
	instructorID := ctx.Param("instructor_id")
	err := c.eventService.RemoveEventInstructor(ctx.Request.Context(), userID, eventID, instructorID)
	if err != nil {
		ctx.JSON(400, gin.H{"success": false, "message": err.Error()})
		return
	}
	ctx.JSON(200, gin.H{"success": true, "message": "Instructor removed successfully"})
}

// GetPendingEvents godoc
// @Summary      List pending events (approval queue)
// @Description  Returns events awaiting approval. Accessible by admin/DI approvers.
// @Tags         Events
// @Produce      json
// @Param        page   query  int  false  "Page (default: 1)"
// @Param        limit  query  int  false  "Limit (default: 10)"
// @Success      200  {object}  dto.EventListResponse
// @Security     BearerAuth
// @Router       /api/v1/events/pending [get]
func (c *eventController) GetPendingEvents(ctx *gin.Context) {
	page, _ := strconv.Atoi(ctx.DefaultQuery("page", "1"))
	limit, _ := strconv.Atoi(ctx.DefaultQuery("limit", "10"))
	res, err := c.eventService.GetPendingEvents(ctx.Request.Context(), page, limit)
	ResponseJSON(ctx, "", res, err)
}

// ApproveEvent godoc
// @Summary      Approve an event
// @Description  Approve a pending event so it becomes visible to members.
// @Tags         Events
// @Produce      json
// @Param        event_id  path  string  true  "Event ID"
// @Success      200  {object}  map[string]interface{}
// @Security     BearerAuth
// @Router       /api/v1/events/{event_id}/approve [put]
func (c *eventController) ApproveEvent(ctx *gin.Context) {
	eventID := ctx.Param("event_id")
	err := c.eventService.ApproveEvent(ctx.Request.Context(), eventID)
	if err != nil {
		ctx.JSON(400, gin.H{"success": false, "message": err.Error()})
		return
	}
	ctx.JSON(200, gin.H{"success": true, "message": "Event approved successfully"})
}

// RejectEvent godoc
// @Summary      Reject an event
// @Description  Reject a pending event with an optional reason.
// @Tags         Events
// @Accept       json
// @Produce      json
// @Param        event_id  path  string                   true  "Event ID"
// @Param        request   body  dto.EventApprovalRequest  false  "Rejection reason"
// @Success      200  {object}  map[string]interface{}
// @Security     BearerAuth
// @Router       /api/v1/events/{event_id}/reject [put]
func (c *eventController) RejectEvent(ctx *gin.Context) {
	eventID := ctx.Param("event_id")
	req, _ := RequestJSON[dto.EventApprovalRequest](ctx)

	err := c.eventService.RejectEvent(ctx.Request.Context(), eventID, req.Reason)
	if err != nil {
		ctx.JSON(400, gin.H{"success": false, "message": err.Error()})
		return
	}
	ctx.JSON(200, gin.H{"success": true, "message": "Event rejected"})
}