package v1

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/gochat/gochat/internal/automation"
	"github.com/gochat/gochat/pkg/response"
)

// MacroHandler handles macro API endpoints.
// Reference: Chatwoot MacrosController — CRUD + execute
type MacroHandler struct {
	svc *automation.MacroService
}

// NewMacroHandler creates a new MacroHandler.
func NewMacroHandler(svc *automation.MacroService) *MacroHandler {
	return &MacroHandler{svc: svc}
}

// List retrieves all macros for an account, respecting visibility.
// GET /api/v1/accounts/:account_id/macros
func (h *MacroHandler) List(c *gin.Context) {
	accountID, err := parseUintParam(c, "account_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

	userID := getUserID(c)

	macros, svcErr := h.svc.ListByAccount(c.Request.Context(), accountID, userID)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"payload": macros,
	})
}

// Get retrieves a single macro by ID.
// GET /api/v1/accounts/:account_id/macros/:id
func (h *MacroHandler) Get(c *gin.Context) {
	macroID, err := parseUintParam(c, "macro_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

	macro, svcErr := h.svc.GetByID(c.Request.Context(), macroID)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, macro)
}

// Create creates a new macro.
// POST /api/v1/accounts/:account_id/macros
func (h *MacroHandler) Create(c *gin.Context) {
	accountID, err := parseUintParam(c, "account_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

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

	macro.AccountID = accountID
	macro.CreatedByID = getUserID(c)
	macro.UpdatedByID = getUserID(c)

	// set_visibility: Chatwoot forces visibility=personal if user role is agent
	// Reference: Chatwoot macro.rb set_visibility — self.visibility = :personal if user.agent?
	role := getRole(c)
	if role == "agent" {
		macro.Visibility = automation.MacroVisibilityPersonal
	}

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

	response.Created(c, macro)
}

// Update updates an existing macro.
// PUT /api/v1/accounts/:account_id/macros/:id
func (h *MacroHandler) Update(c *gin.Context) {
	macroID, err := parseUintParam(c, "macro_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

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

	macro.ID = macroID
	macro.UpdatedByID = getUserID(c)

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

	response.OK(c, macro)
}

// Delete soft-deletes a macro.
// DELETE /api/v1/accounts/:account_id/macros/:id
func (h *MacroHandler) Delete(c *gin.Context) {
	macroID, err := parseUintParam(c, "macro_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

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

	c.JSON(http.StatusOK, gin.H{
		"id":      strconv.FormatUint(uint64(macroID), 10),
		"deleted": true,
	})
}

// Execute runs a macro on a conversation.
// POST /api/v1/accounts/:account_id/macros/:id/execute
// Reference: Chatwoot MacrosController#execute — MacroService.Execute returns error only
func (h *MacroHandler) Execute(c *gin.Context) {
	macroID, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid macro id")
		return
	}

	accountID, err := parseUintParam(c, "account_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

	var body struct {
		ConversationID uint `json:"conversation_id"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "conversation_id is required")
		return
	}

	userID := getUserID(c)

	if svcErr := h.svc.Execute(c.Request.Context(), accountID, body.ConversationID, macroID, userID); svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"success":         true,
		"macro_id":        strconv.FormatUint(uint64(macroID), 10),
		"conversation_id": strconv.FormatUint(uint64(body.ConversationID), 10),
	})
}

// Clone duplicates a macro.
// POST /api/v1/accounts/:account_id/macros/:id/clone
// Reference: Chatwoot MacrosController does not have clone, but AutomationRulesController does.
// gochat adds clone for macros per M6 requirements.
func (h *MacroHandler) Clone(c *gin.Context) {
	accountID, err := parseUintParam(c, "account_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

	macroID, err := parseUintParam(c, "macro_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

	_ = accountID // validated but not used — authorization enforced by middleware

	cloned, svcErr := h.svc.Clone(c.Request.Context(), macroID)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.Created(c, cloned)
}

// ToggleActive toggles the active state of a macro.
// POST /api/v1/accounts/:account_id/macros/:id/toggle_active
// Reference: Chatwoot does not have toggle_active for macros; gochat adds this per M6 requirements.
func (h *MacroHandler) ToggleActive(c *gin.Context) {
	macroID, err := parseUintParam(c, "macro_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

	var req struct {
		Active bool `json:"active"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "active field is required")
		return
	}

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

	c.JSON(http.StatusOK, gin.H{
		"id":     strconv.FormatUint(uint64(macroID), 10),
		"active": req.Active,
	})
}