package v1

import (
	"net/http"

	"github.com/gin-gonic/gin"

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

// AssignmentPolicyV2Handler handles AssignmentPolicy V2 CRUD + inbox associations.
// Reference: Chatwoot app/controllers/api/v1/assignment_policies_controller.rb (V2)
type AssignmentPolicyV2Handler struct {
	svc *service.AssignmentPolicyV2Service
}

// NewAssignmentPolicyV2Handler creates a new AssignmentPolicyV2 handler.
func NewAssignmentPolicyV2Handler(svc *service.AssignmentPolicyV2Service) *AssignmentPolicyV2Handler {
	return &AssignmentPolicyV2Handler{svc: svc}
}

// Create creates a new assignment policy V2.
// POST /api/v1/accounts/:account_id/assignment_policies
func (h *AssignmentPolicyV2Handler) Create(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	var req service.CreatePolicyV2Request
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	policy, svcErr := h.svc.Create(c.Request.Context(), accountID, &req)
	if svcErr != nil {
		applogger.L().Errorf("Create assignment policy V2 for account %d: %v", accountID, svcErr)
		handleServiceError(c, svcErr)
		return
	}

	response.Created(c, policy)
}

// Get retrieves an assignment policy V2 by ID.
// GET /api/v1/accounts/:account_id/assignment_policies/:id
func (h *AssignmentPolicyV2Handler) Get(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	policyID, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "invalid policy id")
		return
	}

	policy, svcErr := h.svc.Get(c.Request.Context(), accountID, policyID)
	if svcErr != nil {
		applogger.L().Errorf("Get assignment policy V2 %d for account %d: %v", policyID, accountID, svcErr)
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, policy)
}

// List retrieves all assignment policies V2 for an account.
// GET /api/v1/accounts/:account_id/assignment_policies
func (h *AssignmentPolicyV2Handler) List(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	policies, svcErr := h.svc.List(c.Request.Context(), accountID)
	if svcErr != nil {
		applogger.L().Errorf("List assignment policies V2 for account %d: %v", accountID, svcErr)
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, policies)
}

// Update updates an assignment policy V2.
// PUT /api/v1/accounts/:account_id/assignment_policies/:id
func (h *AssignmentPolicyV2Handler) Update(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	policyID, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "invalid policy id")
		return
	}

	var req service.UpdatePolicyV2Request
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	policy, svcErr := h.svc.Update(c.Request.Context(), accountID, policyID, &req)
	if svcErr != nil {
		applogger.L().Errorf("Update assignment policy V2 %d for account %d: %v", policyID, accountID, svcErr)
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, policy)
}

// Delete deletes an assignment policy V2.
// DELETE /api/v1/accounts/:account_id/assignment_policies/:id
func (h *AssignmentPolicyV2Handler) Delete(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	policyID, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "invalid policy id")
		return
	}

	svcErr := h.svc.Delete(c.Request.Context(), accountID, policyID)
	if svcErr != nil {
		applogger.L().Errorf("Delete assignment policy V2 %d for account %d: %v", policyID, accountID, svcErr)
		handleServiceError(c, svcErr)
		return
	}

	response.NoContent(c)
}

// ListInboxes retrieves all inboxes associated with a policy.
// GET /api/v1/accounts/:account_id/assignment_policies/:id/inboxes
func (h *AssignmentPolicyV2Handler) ListInboxes(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	policyID, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "invalid policy id")
		return
	}

	apInboxes, svcErr := h.svc.ListInboxes(c.Request.Context(), accountID, policyID)
	if svcErr != nil {
		applogger.L().Errorf("List inboxes for assignment policy V2 %d: %v", policyID, svcErr)
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, apInboxes)
}

// AddInbox associates an inbox with a policy.
// POST /api/v1/accounts/:account_id/assignment_policies/:id/inboxes
func (h *AssignmentPolicyV2Handler) AddInbox(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	policyID, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "invalid policy id")
		return
	}

	var req service.AddInboxRequestV2
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	apInbox, svcErr := h.svc.AddInbox(c.Request.Context(), accountID, policyID, &req)
	if svcErr != nil {
		applogger.L().Errorf("Add inbox to assignment policy V2 %d: %v", policyID, svcErr)
		handleServiceError(c, svcErr)
		return
	}

	response.Created(c, apInbox)
}

// RemoveInbox removes an inbox association from a policy.
// DELETE /api/v1/accounts/:account_id/assignment_policies/:id/inboxes/:inbox_id
func (h *AssignmentPolicyV2Handler) RemoveInbox(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	policyID, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "invalid policy id")
		return
	}

	inboxID, err := parseUintParam(c, "inbox_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "invalid inbox id")
		return
	}

	svcErr := h.svc.RemoveInbox(c.Request.Context(), accountID, policyID, inboxID)
	if svcErr != nil {
		applogger.L().Errorf("Remove inbox %d from assignment policy V2 %d: %v", inboxID, policyID, svcErr)
		handleServiceError(c, svcErr)
		return
	}

	response.NoContent(c)
}

// GetInboxPolicy retrieves the assignment policy for a specific inbox.
// GET /api/v1/accounts/:account_id/inboxes/:inbox_id/assignment_policy
func (h *AssignmentPolicyV2Handler) GetInboxPolicy(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	inboxID, err := parseUintParam(c, "inbox_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "invalid inbox id")
		return
	}

	policy, svcErr := h.svc.GetInboxPolicy(c.Request.Context(), accountID, inboxID)
	if svcErr != nil {
		applogger.L().Errorf("Get assignment policy V2 for inbox %d: %v", inboxID, svcErr)
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, policy)
}

// SetInboxPolicy sets the assignment policy for a specific inbox.
// POST /api/v1/accounts/:account_id/inboxes/:inbox_id/assignment_policy
func (h *AssignmentPolicyV2Handler) SetInboxPolicy(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	inboxID, err := parseUintParam(c, "inbox_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "invalid inbox id")
		return
	}

	var req struct {
		PolicyID uint `json:"policy_id" validate:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	apInbox, svcErr := h.svc.SetInboxPolicy(c.Request.Context(), accountID, inboxID, req.PolicyID)
	if svcErr != nil {
		applogger.L().Errorf("Set assignment policy V2 for inbox %d: %v", inboxID, svcErr)
		handleServiceError(c, svcErr)
		return
	}

	response.Created(c, apInbox)
}

// DeleteInboxPolicy removes the assignment policy association from an inbox.
// DELETE /api/v1/accounts/:account_id/inboxes/:inbox_id/assignment_policy
func (h *AssignmentPolicyV2Handler) DeleteInboxPolicy(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	inboxID, err := parseUintParam(c, "inbox_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "invalid inbox id")
		return
	}

	svcErr := h.svc.DeleteInboxPolicy(c.Request.Context(), accountID, inboxID)
	if svcErr != nil {
		applogger.L().Errorf("Delete assignment policy V2 from inbox %d: %v", inboxID, svcErr)
		handleServiceError(c, svcErr)
		return
	}

	response.NoContent(c)
}