package v1

import (
	"net/http"

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

// BotRuleHandler handles bot rule API endpoints.
// Reference: Chatwoot AutomationRulesController pattern adapted for AgentBot rules.
type BotRuleHandler struct {
	svc *automation.BotRuleService
}

// NewBotRuleHandler creates a new BotRuleHandler.
func NewBotRuleHandler(svc *automation.BotRuleService) *BotRuleHandler {
	return &BotRuleHandler{svc: svc}
}

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

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

	c.JSON(http.StatusOK, gin.H{
		"bot_rules": rules,
		"meta":      gin.H{"count": len(rules)},
	})
}

// ListByBot retrieves all bot rules for a specific AgentBot.
// GET /api/v1/accounts/:account_id/agent_bots/:agent_bot_id/bot_rules
func (h *BotRuleHandler) ListByBot(c *gin.Context) {
	accountID, err := parseUintParam(c, "account_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	agentBotID, err := parseUintParam(c, "agent_bot_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid agent_bot_id")
		return
	}

	rules, svcErr := h.svc.ListByAgentBot(c.Request.Context(), accountID, agentBotID)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"bot_rules": rules,
		"meta":      gin.H{"count": len(rules)},
	})
}

// Get retrieves a single bot rule by ID.
// GET /api/v1/accounts/:account_id/agent_bots/:agent_bot_id/bot_rules/:id
func (h *BotRuleHandler) Get(c *gin.Context) {
	id, err := parseUintAnyParam(c, "rule_id", "id", "agent_bot_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

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

	response.OK(c, rule)
}

// Create creates a new bot rule for an AgentBot.
// POST /api/v1/accounts/:account_id/agent_bots/:agent_bot_id/bot_rules
func (h *BotRuleHandler) Create(c *gin.Context) {
	accountID, err := parseUintParam(c, "account_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	agentBotID, err := parseUintParam(c, "agent_bot_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid agent_bot_id")
		return
	}

	var req struct {
		Name        string                      `json:"name" binding:"required"`
		Description string                      `json:"description"`
		EventName   automation.BotRuleEventType `json:"event_name" binding:"required"`
		Conditions  automation.Conditions       `json:"conditions"`
		Actions     automation.Actions          `json:"actions"`
		Status      automation.BotRuleStatus    `json:"status"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	rule := &automation.BotRule{
		AccountID:   accountID,
		AgentBotID:  agentBotID,
		Name:        req.Name,
		Description: req.Description,
		EventName:   req.EventName,
		Conditions:  req.Conditions,
		Actions:     req.Actions,
		Status:      req.Status,
	}
	// Default to active if not specified
	if rule.Status == "" {
		rule.Status = automation.BotRuleStatusActive
	}

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

	response.Created(c, rule)
}

// Update updates an existing bot rule.
// PUT /api/v1/accounts/:account_id/agent_bots/:agent_bot_id/bot_rules/:id
func (h *BotRuleHandler) Update(c *gin.Context) {
	id, err := parseUintAnyParam(c, "rule_id", "id", "agent_bot_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

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

	var req struct {
		Name        string                      `json:"name"`
		Description string                      `json:"description"`
		EventName   automation.BotRuleEventType `json:"event_name"`
		Conditions  automation.Conditions       `json:"conditions"`
		Actions     automation.Actions          `json:"actions"`
		Status      automation.BotRuleStatus    `json:"status"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	// Apply updates
	if req.Name != "" {
		existing.Name = req.Name
	}
	if req.Description != "" {
		existing.Description = req.Description
	}
	if req.EventName != "" {
		existing.EventName = req.EventName
	}
	if req.Conditions != nil {
		existing.Conditions = req.Conditions
	}
	if req.Actions != nil {
		existing.Actions = req.Actions
	}
	if req.Status != "" {
		existing.Status = req.Status
	}

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

	response.OK(c, existing)
}

// Delete soft-deletes a bot rule.
// DELETE /api/v1/accounts/:account_id/agent_bots/:agent_bot_id/bot_rules/:id
func (h *BotRuleHandler) Delete(c *gin.Context) {
	id, err := parseUintAnyParam(c, "rule_id", "id", "agent_bot_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

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

	response.NoContent(c)
}

// ToggleStatus toggles the active/inactive status of a bot rule.
// PATCH /api/v1/accounts/:account_id/agent_bots/:agent_bot_id/bot_rules/:id/status
func (h *BotRuleHandler) ToggleStatus(c *gin.Context) {
	id, err := parseUintAnyParam(c, "rule_id", "id", "agent_bot_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

	var req struct {
		Status automation.BotRuleStatus `json:"status" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

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

	response.OK(c, gin.H{"id": id, "status": req.Status})
}

// Clone duplicates a bot rule.
// POST /api/v1/accounts/:account_id/agent_bots/:agent_bot_id/bot_rules/:id/clone
func (h *BotRuleHandler) Clone(c *gin.Context) {
	id, err := parseUintAnyParam(c, "rule_id", "id", "agent_bot_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

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

	response.Created(c, cloned)
}