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/response"
)

// EmailChannelMigrationHandler handles account-scoped email channel migration endpoints.
// Reference: Chatwoot api/v1/accounts/:account_id/email_channel_migrations — create-only
// endpoint for initiating migration of an email channel from one inbox to another.
type EmailChannelMigrationHandler struct {
	svc *service.EmailChannelMigrationService
}

// NewEmailChannelMigrationHandler creates a new EmailChannelMigrationHandler with service injection.
func NewEmailChannelMigrationHandler(svc *service.EmailChannelMigrationService) *EmailChannelMigrationHandler {
	return &EmailChannelMigrationHandler{svc: svc}
}

// Create initiates a new email channel migration from one inbox to another.
// POST /api/v1/accounts/:account_id/email_channel_migrations
func (h *EmailChannelMigrationHandler) Create(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

	var req struct {
		InboxID       uint `json:"inbox_id" binding:"required"`
		TargetInboxID uint `json:"target_inbox_id" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	migration := &model.EmailChannelMigration{
		AccountID:       accountID,
		InboxID:         req.InboxID,
		TargetInboxID:   req.TargetInboxID,
		MigrationStatus: "pending",
	}

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

// List retrieves all email channel migrations for the current account.
// GET /api/v1/accounts/:account_id/email_channel_migrations
func (h *EmailChannelMigrationHandler) List(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

	migrations, err := h.svc.ListByAccount(c.Request.Context(), accountID)
	if err != nil {
		handleServiceError(c, err)
		return
	}
	response.OK(c, migrations)
}

// RegisterEmailChannelMigrationRoutes registers email channel migration routes on the given router group.
func RegisterEmailChannelMigrationRoutes(g *gin.RouterGroup, h *EmailChannelMigrationHandler) {
	g.POST("/", h.Create)
	g.GET("/", h.List)
}