package handler

import (
	"github.com/gofiber/fiber/v2"
	"github.com/google/uuid"

	"github.com/gosec/gsc-ops-api/internal/middleware"
	"github.com/gosec/gsc-ops-api/internal/service"
	"github.com/gosec/gsc-ops-api/pkg/types"
)

// VoiceAgentHandler handles voice agent management endpoints
type VoiceAgentHandler struct {
	svc *service.VoiceAgentService
}

// NewVoiceAgentHandler creates a new voice agent handler
func NewVoiceAgentHandler(svc *service.VoiceAgentService) *VoiceAgentHandler {
	return &VoiceAgentHandler{svc: svc}
}

// ============================================================================
// Voice Agent Configs
// ============================================================================

// ListConfigs handles GET /api/v1/voice-agents
func (h *VoiceAgentHandler) ListConfigs(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	params := types.ListParams{
		Limit:  c.QueryInt("limit", 50),
		Offset: c.QueryInt("offset", 0),
		Search: c.Query("search"),
	}

	var tenantID *uuid.UUID
	if tid := c.Query("tenantId"); tid != "" {
		parsed, err := uuid.Parse(tid)
		if err != nil {
			apiErr := types.NewBadRequest("Invalid tenantId")
			return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
		}
		tenantID = &parsed
	}

	configs, total, err := h.svc.ListConfigs(c.Context(), params, tenantID)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewPagedResponse(configs, total, params.Limit, params.Offset, reqID))
}

// GetConfig handles GET /api/v1/voice-agents/:id
func (h *VoiceAgentHandler) GetConfig(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	id, err := uuid.Parse(c.Params("id"))
	if err != nil {
		apiErr := types.NewBadRequest("Invalid voice agent config ID")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	config, err := h.svc.GetConfig(c.Context(), id)
	if err != nil {
		apiErr := types.NewNotFound("Voice agent config not found")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(config, reqID))
}

// CreateConfig handles POST /api/v1/voice-agents
func (h *VoiceAgentHandler) CreateConfig(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	var req types.VoiceAgentConfigCreate
	if err := c.BodyParser(&req); err != nil {
		apiErr := types.NewBadRequest("Invalid request body: " + err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	if req.TenantID == uuid.Nil || req.AgentID == uuid.Nil {
		apiErr := types.NewValidation("tenantId and agentId are required")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	config, err := h.svc.CreateConfig(c.Context(), &req)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.Status(fiber.StatusCreated).JSON(types.NewDataResponse(config, reqID))
}

// UpdateConfig handles PUT /api/v1/voice-agents/:id
func (h *VoiceAgentHandler) UpdateConfig(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	id, err := uuid.Parse(c.Params("id"))
	if err != nil {
		apiErr := types.NewBadRequest("Invalid voice agent config ID")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	var req types.VoiceAgentConfigUpdate
	if err := c.BodyParser(&req); err != nil {
		apiErr := types.NewBadRequest("Invalid request body: " + err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	config, err := h.svc.UpdateConfig(c.Context(), id, &req)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(config, reqID))
}

// DeleteConfig handles DELETE /api/v1/voice-agents/:id
func (h *VoiceAgentHandler) DeleteConfig(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	id, err := uuid.Parse(c.Params("id"))
	if err != nil {
		apiErr := types.NewBadRequest("Invalid voice agent config ID")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	if err := h.svc.DeleteConfig(c.Context(), id); err != nil {
		apiErr := types.NewNotFound("Voice agent config not found")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.SendStatus(fiber.StatusNoContent)
}

// ============================================================================
// Voice Sessions
// ============================================================================

// ListSessions handles GET /api/v1/voice-agents/:id/sessions
func (h *VoiceAgentHandler) ListSessions(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	agentID, err := uuid.Parse(c.Params("id"))
	if err != nil {
		apiErr := types.NewBadRequest("Invalid voice agent config ID")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	params := types.ListParams{
		Limit:  c.QueryInt("limit", 50),
		Offset: c.QueryInt("offset", 0),
	}

	sessions, total, err := h.svc.ListSessions(c.Context(), agentID, params)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewPagedResponse(sessions, total, params.Limit, params.Offset, reqID))
}

// GetSession handles GET /api/v1/voice-agents/sessions/:sessionId
func (h *VoiceAgentHandler) GetSession(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	sessionID, err := uuid.Parse(c.Params("sessionId"))
	if err != nil {
		apiErr := types.NewBadRequest("Invalid session ID")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	session, err := h.svc.GetSession(c.Context(), sessionID)
	if err != nil {
		apiErr := types.NewNotFound("Voice session not found")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(session, reqID))
}