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"
)

// PersonaHandler handles persona management endpoints
type PersonaHandler struct {
	svc *service.PersonaService
}

// NewPersonaHandler creates a new persona handler
func NewPersonaHandler(svc *service.PersonaService) *PersonaHandler {
	return &PersonaHandler{svc: svc}
}

// parseTenantID extracts and validates tenantId from query or body
func parseTenantID(c *fiber.Ctx) (uuid.UUID, *types.APIError) {
	tid := c.Query("tenantId")
	if tid == "" {
		return uuid.Nil, types.NewBadRequest("tenantId query parameter is required")
	}
	parsed, err := uuid.Parse(tid)
	if err != nil {
		return uuid.Nil, types.NewBadRequest("Invalid tenantId")
	}
	return parsed, nil
}

// ListPersonas handles GET /api/v1/personas
func (h *PersonaHandler) ListPersonas(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	tenantID, apiErr := parseTenantID(c)
	if apiErr != nil {
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

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

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

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

// GetPersona handles GET /api/v1/personas/:id
func (h *PersonaHandler) GetPersona(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

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

	tenantID, apiErr := parseTenantID(c)
	if apiErr != nil {
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	persona, err := h.svc.GetPersona(c.Context(), id, tenantID)
	if err != nil {
		apiErr := types.NewNotFound("Persona not found")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

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

// CreatePersona handles POST /api/v1/personas
func (h *PersonaHandler) CreatePersona(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	var req types.PersonaCreate
	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 {
		apiErr := types.NewValidation("tenantId is required")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}
	if req.Name == "" {
		apiErr := types.NewValidation("name is required")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	persona, err := h.svc.CreatePersona(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(persona, reqID))
}

// UpdatePersona handles PUT /api/v1/personas/:id
func (h *PersonaHandler) UpdatePersona(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

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

	tenantID, apiErr := parseTenantID(c)
	if apiErr != nil {
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	var req types.PersonaUpdate
	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))
	}

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

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

// DeletePersona handles DELETE /api/v1/personas/:id
func (h *PersonaHandler) DeletePersona(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

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

	tenantID, apiErr := parseTenantID(c)
	if apiErr != nil {
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

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

	return c.SendStatus(fiber.StatusNoContent)
}

// GetSelfModel handles GET /api/v1/personas/:id/self-model
func (h *PersonaHandler) GetSelfModel(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

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

	tenantID, apiErr := parseTenantID(c)
	if apiErr != nil {
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	snapshot, err := h.svc.GetSelfModel(c.Context(), id, tenantID)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

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

// GetExperiences handles GET /api/v1/personas/:id/experiences
func (h *PersonaHandler) GetExperiences(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

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

	tenantID, apiErr := parseTenantID(c)
	if apiErr != nil {
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	limit := c.QueryInt("limit", 20)

	experiences, err := h.svc.SearchExperiences(c.Context(), id, tenantID, limit)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

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

// GetEvaluations handles GET /api/v1/personas/:id/evaluations/:sessionId
func (h *PersonaHandler) GetEvaluations(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))
	}

	limit := c.QueryInt("limit", 10)

	evaluations, err := h.svc.GetEvaluations(c.Context(), sessionID, limit)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

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

// GetMoralPattern handles GET /api/v1/personas/:id/moral-pattern/:sessionId
func (h *PersonaHandler) GetMoralPattern(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))
	}

	tenantID, apiErr := parseTenantID(c)
	if apiErr != nil {
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	assessments, err := h.svc.GetMoralPattern(c.Context(), sessionID, tenantID)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(map[string]interface{}{
		"assessments": assessments,
	}, reqID))
}