package handlers

import (
	"fmt"
	"strconv"
	"time"

	"github.com/SamuelTariku/FortuneBet-Backend/internal/domain"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/services/authentication"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/web_server/response"
	"github.com/gofiber/fiber/v2"
	"go.uber.org/zap"
)

type CreateTransactionApproverReq struct {
	FirstName   string `json:"first_name" example:"John"`
	LastName    string `json:"last_name" example:"Doe"`
	Email       string `json:"email" example:"john.doe@example.com"`
	PhoneNumber string `json:"phone_number" example:"1234567890"`
	Password    string `json:"password" example:"password123"`
	CompanyID   int64  `json:"company_id" example:"1"`
}

// CreateTransactionApprover godoc
// @Summary Create transaction approver
// @Description Create transaction approver
// @Tags admin
// @Accept json
// @Produce json
// @Param manger body CreateTransactionApproverReq true "Create transaction approver"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /api/v1/admin [post]
func (h *Handler) CreateTransactionApprover(c *fiber.Ctx) error {
	var companyID domain.ValidInt64
	var req CreateTransactionApproverReq

	if err := c.BodyParser(&req); err != nil {
		h.mongoLoggerSvc.Info("failed to parse CreateAdmin request",
			zap.Int64("status_code", fiber.StatusBadRequest),
			zap.Error(err),
			zap.Time("timestamp", time.Now()),
		)
		return fiber.NewError(fiber.StatusBadRequest, "Invalid request:"+err.Error())
	}

	valErrs, ok := h.validator.Validate(c, req)
	if !ok {
		var errMsg string
		for field, msg := range valErrs {
			errMsg += fmt.Sprintf("%s: %s; ", field, msg)
		}
		h.mongoLoggerSvc.Error("validation failed for CreateAdmin request",
			zap.Int64("status_code", fiber.StatusBadRequest),
			zap.Any("validation_errors", valErrs),
			zap.Time("timestamp", time.Now()),
		)
		return fiber.NewError(fiber.StatusBadRequest, errMsg)
	}

	_, err := h.companySvc.GetCompanyByID(c.Context(), req.CompanyID)
	if err != nil {
		h.mongoLoggerSvc.Error("invalid company ID for CreateAdmin",
			zap.Int64("status_code", fiber.StatusInternalServerError),
			zap.Int64("company_id", req.CompanyID),
			zap.Error(err),
			zap.Time("timestamp", time.Now()),
		)
		return fiber.NewError(fiber.StatusInternalServerError, "Company ID is invalid:"+err.Error())
	}
	companyID = domain.ValidInt64{
		Value: req.CompanyID,
		Valid: true,
	}

	user := domain.CreateUserReq{
		FirstName:   req.FirstName,
		LastName:    req.LastName,
		Email:       req.Email,
		PhoneNumber: req.PhoneNumber,
		Password:    req.Password,
		Role:        string(domain.RoleTransactionApprover),
		CompanyID:   companyID,
	}

	newUser, err := h.userSvc.CreateUser(c.Context(), user, true)
	if err != nil {
		h.mongoLoggerSvc.Error("failed to create admin user",
			zap.Int64("status_code", fiber.StatusInternalServerError),
			zap.Any("request", req),
			zap.Error(err),
			zap.Time("timestamp", time.Now()),
		)
		return fiber.NewError(fiber.StatusInternalServerError, "Failed to create admin:"+err.Error())
	}

	h.mongoLoggerSvc.Info("transaction_approver created successfully",
		zap.Int64("transaction_approver_id", newUser.ID),
		zap.String("email", newUser.Email),
		zap.Time("timestamp", time.Now()),
	)

	return response.WriteJSON(c, fiber.StatusOK, "Transaction Approver created successfully", nil, nil)
}

type TransactionApproverRes struct {
	ID            int64       `json:"id"`
	FirstName     string      `json:"first_name"`
	LastName      string      `json:"last_name"`
	Email         string      `json:"email"`
	PhoneNumber   string      `json:"phone_number"`
	Role          domain.Role `json:"role"`
	EmailVerified bool        `json:"email_verified"`
	PhoneVerified bool        `json:"phone_verified"`
	CreatedAt     time.Time   `json:"created_at"`
	UpdatedAt     time.Time   `json:"updated_at"`
	LastLogin     time.Time   `json:"last_login"`
	SuspendedAt   time.Time   `json:"suspended_at"`
	Suspended     bool        `json:"suspended"`
}

// GetAllAdmins godoc
// @Summary Get all Admins
// @Description Get all Admins
// @Tags admin
// @Accept json
// @Produce json
// @Param page query int false "Page number"
// @Param page_size query int false "Page size"
// @Success 200 {object} AdminRes
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /api/v1/t-approver [get]
func (h *Handler) GetAllTransactionApprovers(c *fiber.Ctx) error {
	role := c.Locals("role").(domain.Role)
	companyID := c.Locals("company_id").(domain.ValidInt64)

	searchQuery := c.Query("query")
	searchString := domain.ValidString{
		Value: searchQuery,
		Valid: searchQuery != "",
	}

	createdBeforeQuery := c.Query("created_before")
	var createdBefore domain.ValidTime
	if createdBeforeQuery != "" {
		createdBeforeParsed, err := time.Parse(time.RFC3339, createdBeforeQuery)
		if err != nil {
			h.logger.Info("invalid start_time format", "error", err)
			return fiber.NewError(fiber.StatusBadRequest, "Invalid start_time format")
		}
		createdBefore = domain.ValidTime{
			Value: createdBeforeParsed,
			Valid: true,
		}
	}

	createdAfterQuery := c.Query("created_after")
	var createdAfter domain.ValidTime
	if createdAfterQuery != "" {
		createdAfterParsed, err := time.Parse(time.RFC3339, createdAfterQuery)
		if err != nil {
			h.logger.Info("invalid start_time format", "error", err)
			return fiber.NewError(fiber.StatusBadRequest, "Invalid start_time format")
		}
		createdAfter = domain.ValidTime{
			Value: createdAfterParsed,
			Valid: true,
		}
	}

	var companyIDFilter domain.ValidInt64
	if role == domain.RoleSuperAdmin {
		companyIDQuery := int64(c.QueryInt("company_id"))
		companyIDFilter =  domain.ValidInt64{
			Value: companyIDQuery,
			Valid: companyIDQuery != 0,
		}
	} else {
		if !companyID.Valid {
			h.logger.Info("invalid companyID")
			return fiber.NewError(fiber.StatusBadRequest, "Unable to get company ID")
		}

		companyIDFilter = companyID
	}

	filter := domain.UserFilter{
		Role:      string(domain.RoleTransactionApprover),
		CompanyID: companyIDFilter,
		Page: domain.ValidInt{
			Value: c.QueryInt("page", 1) - 1,
			Valid: true,
		},
		PageSize: domain.ValidInt{
			Value: c.QueryInt("page_size", 10),
			Valid: true,
		},
		Query:         searchString,
		CreatedBefore: createdBefore,
		CreatedAfter:  createdAfter,
	}

	valErrs, ok := h.validator.Validate(c, filter)
	if !ok {
		var errMsg string
		for field, msg := range valErrs {
			errMsg += fmt.Sprintf("%s: %s; ", field, msg)
		}
		h.mongoLoggerSvc.Info("invalid filter values in GetAllAdmins request",
			zap.Int("status_code", fiber.StatusBadRequest),
			zap.Any("validation_errors", valErrs),
			zap.Time("timestamp", time.Now()),
		)
		return fiber.NewError(fiber.StatusBadRequest, errMsg)
	}

	users, total, err := h.userSvc.GetAllUsers(c.Context(), filter)
	if err != nil {
		h.mongoLoggerSvc.Error("failed to get users from user service",
			zap.Int("status_code", fiber.StatusInternalServerError),
			zap.Any("filter", filter),
			zap.Error(err),
			zap.Time("timestamp", time.Now()),
		)
		return fiber.NewError(fiber.StatusInternalServerError, "Failed to get users"+err.Error())
	}

	result := make([]TransactionApproverRes, len(users))
	for index, admin := range users {
		lastLogin, err := h.authSvc.GetLastLogin(c.Context(), admin.ID)
		if err != nil {
			if err == authentication.ErrRefreshTokenNotFound {
				lastLogin = &admin.CreatedAt
			} else {
				h.mongoLoggerSvc.Error("failed to get last login for admin",
					zap.Int("status_code", fiber.StatusInternalServerError),
					zap.Int64("admin_id", admin.ID),
					zap.Error(err),
					zap.Time("timestamp", time.Now()),
				)
				return fiber.NewError(fiber.StatusInternalServerError, "Failed to retrieve user last login"+err.Error())
			}
		}

		result[index] = TransactionApproverRes{
			ID:            admin.ID,
			FirstName:     admin.FirstName,
			LastName:      admin.LastName,
			Email:         admin.Email,
			PhoneNumber:   admin.PhoneNumber,
			Role:          admin.Role,
			EmailVerified: admin.EmailVerified,
			PhoneVerified: admin.PhoneVerified,
			CreatedAt:     admin.CreatedAt,
			UpdatedAt:     admin.UpdatedAt,
			SuspendedAt:   admin.SuspendedAt,
			Suspended:     admin.Suspended,
			LastLogin:     *lastLogin,
		}
	}

	h.mongoLoggerSvc.Info("approvers retrieved successfully",
		zap.Int("status_code", fiber.StatusOK),
		zap.Int("count", len(result)),
		zap.Int("page", filter.Page.Value+1),
		zap.Time("timestamp", time.Now()),
	)

	return response.WritePaginatedJSON(c, fiber.StatusOK, "Admins retrieved successfully", result, nil, filter.Page.Value, int(total))
}

// GetAdminByID godoc
// @Summary Get admin by id
// @Description Get a single admin by id
// @Tags admin
// @Accept json
// @Produce json
// @Param id path int true "User ID"
// @Success 200 {object} AdminRes
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /api/v1/t-approver/{id} [get]
func (h *Handler) GetTransactionApproverByID(c *fiber.Ctx) error {
	userIDstr := c.Params("id")
	userID, err := strconv.ParseInt(userIDstr, 10, 64)
	if err != nil {
		h.mongoLoggerSvc.Error("invalid admin ID param",
			zap.Int("status_code", fiber.StatusBadRequest),
			zap.String("param", userIDstr),
			zap.Error(err),
			zap.Time("timestamp", time.Now()),
		)
		return fiber.NewError(fiber.StatusBadRequest, "Invalid admin ID")
	}

	user, err := h.userSvc.GetUserByID(c.Context(), userID)
	if err != nil {
		h.mongoLoggerSvc.Error("failed to fetch admin by ID",
			zap.Int("status_code", fiber.StatusInternalServerError),
			zap.Int64("admin_id", userID),
			zap.Error(err),
			zap.Time("timestamp", time.Now()),
		)
		return fiber.NewError(fiber.StatusInternalServerError, "Failed to get admin"+err.Error())
	}

	lastLogin, err := h.authSvc.GetLastLogin(c.Context(), user.ID)
	if err != nil && err != authentication.ErrRefreshTokenNotFound {
		h.mongoLoggerSvc.Error("failed to get admin last login",
			zap.Int("status_code", fiber.StatusInternalServerError),
			zap.Int64("admin_id", user.ID),
			zap.Error(err),
			zap.Time("timestamp", time.Now()),
		)
		return fiber.NewError(fiber.StatusInternalServerError, "Failed to retrieve user last login:"+err.Error())
	}
	if err == authentication.ErrRefreshTokenNotFound {
		lastLogin = &user.CreatedAt
	}

	res := TransactionApproverRes{
		ID:            user.ID,
		FirstName:     user.FirstName,
		LastName:      user.LastName,
		Email:         user.Email,
		PhoneNumber:   user.PhoneNumber,
		Role:          user.Role,
		EmailVerified: user.EmailVerified,
		PhoneVerified: user.PhoneVerified,
		CreatedAt:     user.CreatedAt,
		UpdatedAt:     user.UpdatedAt,
		SuspendedAt:   user.SuspendedAt,
		Suspended:     user.Suspended,
		LastLogin:     *lastLogin,
	}

	h.mongoLoggerSvc.Info("admin retrieved successfully",
		zap.Int("status_code", fiber.StatusOK),
		zap.Int64("admin_id", user.ID),
		zap.Time("timestamp", time.Now()),
	)

	return response.WriteJSON(c, fiber.StatusOK, "Admin retrieved successfully", res, nil)
}

type updateTransactionApproverReq struct {
	FirstName string `json:"first_name" example:"John"`
	LastName  string `json:"last_name" example:"Doe"`
	Suspended bool   `json:"suspended" example:"false"`
}

// UpdateAdmin godoc
// @Summary Update Admin
// @Description Update Admin
// @Tags admin
// @Accept json
// @Produce json
// @Param admin body updateAdminReq true "Update Admin"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /api/v1/t-approver/{id} [put]
func (h *Handler) UpdateTransactionApprover(c *fiber.Ctx) error {
	var req updateTransactionApproverReq
	if err := c.BodyParser(&req); err != nil {
		h.mongoLoggerSvc.Error("UpdateAdmin failed - invalid request body",
			zap.Int("status_code", fiber.StatusBadRequest),
			zap.Error(err),
			zap.Time("timestamp", time.Now()),
		)
		return fiber.NewError(fiber.StatusBadRequest, "Invalid request body:"+err.Error())
	}

	valErrs, ok := h.validator.Validate(c, req)
	if !ok {
		var errMsg string
		for field, msg := range valErrs {
			errMsg += fmt.Sprintf("%s: %s; ", field, msg)
		}
		h.mongoLoggerSvc.Error("UpdateAdmin failed - validation errors",
			zap.Int("status_code", fiber.StatusBadRequest),
			zap.Any("validation_errors", valErrs),
			zap.Time("timestamp", time.Now()),
		)
		return fiber.NewError(fiber.StatusBadRequest, errMsg)
	}

	ApproverIDStr := c.Params("id")
	ApproverID, err := strconv.ParseInt(ApproverIDStr, 10, 64)
	if err != nil {
		h.mongoLoggerSvc.Info("UpdateAdmin failed - invalid Admin ID param",
			zap.Int("status_code", fiber.StatusBadRequest),
			zap.String("admin_id_param", ApproverIDStr),
			zap.Error(err),
			zap.Time("timestamp", time.Now()),
		)
		return fiber.NewError(fiber.StatusBadRequest, "Invalid Admin ID")
	}

	err = h.userSvc.UpdateUser(c.Context(), domain.UpdateUserReq{
		UserId: ApproverID,
		FirstName: domain.ValidString{
			Value: req.FirstName,
			Valid: req.FirstName != "",
		},
		LastName: domain.ValidString{
			Value: req.LastName,
			Valid: req.LastName != "",
		},
		Suspended: domain.ValidBool{
			Value: req.Suspended,
			Valid: true,
		},
	})
	if err != nil {
		h.mongoLoggerSvc.Error("UpdateAdmin failed - user service error",
			zap.Int("status_code", fiber.StatusInternalServerError),
			zap.Int64("admin_id", ApproverID),
			zap.Error(err),
			zap.Time("timestamp", time.Now()),
		)
		return fiber.NewError(fiber.StatusInternalServerError, "Failed to update admin:"+err.Error())
	}

	h.mongoLoggerSvc.Info("UpdateAdmin succeeded",
		zap.Int("status_code", fiber.StatusOK),
		zap.Int64("admin_id", ApproverID),
		zap.Time("timestamp", time.Now()),
	)

	return response.WriteJSON(c, fiber.StatusOK, "Managers updated successfully", nil, nil)
}