package v1

import (
	"net/http"

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

// BotTriggerConfigHandler handles bot trigger condition config API endpoints.
// Reference: Chatwoot AutomationRulesController trigger conditions pattern adapted for AgentBot.
type BotTriggerConfigHandler struct {
	svc *automation.BotTriggerConfigService
}

// NewBotTriggerConfigHandler creates a new BotTriggerConfigHandler.
func NewBotTriggerConfigHandler(svc *automation.BotTriggerConfigService) *BotTriggerConfigHandler {
	return &BotTriggerConfigHandler{svc: svc}
}

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

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

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

// ListByBot retrieves all trigger configs for a specific AgentBot.
// GET /api/v1/accounts/:account_id/agent_bots/:agent_bot_id/trigger_configs
func (h *BotTriggerConfigHandler) 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
	}

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

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

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

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

	response.OK(c, config)
}

// Create creates a new trigger config for an AgentBot.
// POST /api/v1/accounts/:account_id/agent_bots/:agent_bot_id/trigger_configs
func (h *BotTriggerConfigHandler) 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.TriggerConditions `json:"conditions"`
		QueryOperator string                       `json:"query_operator"`
		Active        bool                         `json:"active"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	config := &automation.BotTriggerConfig{
		AccountID:     accountID,
		AgentBotID:    agentBotID,
		Name:          req.Name,
		Description:   req.Description,
		EventName:     req.EventName,
		Conditions:    req.Conditions,
		QueryOperator: req.QueryOperator,
		Active:        req.Active,
	}
	// Default query_operator to "and"
	if config.QueryOperator == "" {
		config.QueryOperator = "and"
	}
	// Default to active if not explicitly set
	if !config.Active && req.Active == false {
		// Only default to active when the field was not provided in JSON
		// (JSON deserialization defaults bool to false)
		config.Active = true
	}

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

	response.Created(c, config)
}

// Update updates an existing trigger config.
// PUT /api/v1/accounts/:account_id/agent_bots/:agent_bot_id/trigger_configs/:id
func (h *BotTriggerConfigHandler) Update(c *gin.Context) {
	id, err := parseUintAnyParam(c, "trigger_config_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.TriggerConditions `json:"conditions"`
		QueryOperator string                       `json:"query_operator"`
		Active        bool                         `json:"active"`
	}
	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.QueryOperator != "" {
		existing.QueryOperator = req.QueryOperator
	}
	existing.Active = req.Active

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

	response.OK(c, existing)
}

// Delete soft-deletes a trigger config.
// DELETE /api/v1/accounts/:account_id/agent_bots/:agent_bot_id/trigger_configs/:id
func (h *BotTriggerConfigHandler) Delete(c *gin.Context) {
	id, err := parseUintAnyParam(c, "trigger_config_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)
}

// ToggleActive toggles the active state of a trigger config.
// PATCH /api/v1/accounts/:account_id/agent_bots/:agent_bot_id/trigger_configs/:id/active
func (h *BotTriggerConfigHandler) ToggleActive(c *gin.Context) {
	id, err := parseUintAnyParam(c, "trigger_config_id", "id", "agent_bot_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

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

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

	response.OK(c, gin.H{"id": id, "active": req.Active})
}