package internalhttp

import (
	"context"
	"net/http"
	"strconv"
	"strings"
	"time"

	"galaxy/user/internal/service/adminusers"
	"galaxy/user/internal/service/shared"

	"github.com/gin-gonic/gin"
)

type getUserByEmailRequest struct {
	Email string `json:"email"`
}

type getUserByUserNameRequest struct {
	UserName string `json:"user_name"`
}

func handleGetUserByID(useCase GetUserByIDUseCase, timeout time.Duration) gin.HandlerFunc {
	return func(c *gin.Context) {
		callCtx, cancel := context.WithTimeout(c.Request.Context(), timeout)
		defer cancel()

		result, err := useCase.Execute(callCtx, adminusers.GetUserByIDInput{
			UserID: c.Param("user_id"),
		})
		if err != nil {
			abortWithProjection(c, shared.ProjectInternalError(err))
			return
		}

		c.JSON(http.StatusOK, result)
	}
}

func handleGetUserByEmail(useCase GetUserByEmailUseCase, timeout time.Duration) gin.HandlerFunc {
	return func(c *gin.Context) {
		var request getUserByEmailRequest
		if err := decodeJSONRequest(c.Request, &request); err != nil {
			abortWithProjection(c, shared.ProjectInternalError(shared.InvalidRequest(err.Error())))
			return
		}

		callCtx, cancel := context.WithTimeout(c.Request.Context(), timeout)
		defer cancel()

		result, err := useCase.Execute(callCtx, adminusers.GetUserByEmailInput{
			Email: request.Email,
		})
		if err != nil {
			abortWithProjection(c, shared.ProjectInternalError(err))
			return
		}

		c.JSON(http.StatusOK, result)
	}
}

func handleGetUserByUserName(useCase GetUserByUserNameUseCase, timeout time.Duration) gin.HandlerFunc {
	return func(c *gin.Context) {
		var request getUserByUserNameRequest
		if err := decodeJSONRequest(c.Request, &request); err != nil {
			abortWithProjection(c, shared.ProjectInternalError(shared.InvalidRequest(err.Error())))
			return
		}

		callCtx, cancel := context.WithTimeout(c.Request.Context(), timeout)
		defer cancel()

		result, err := useCase.Execute(callCtx, adminusers.GetUserByUserNameInput{
			UserName: request.UserName,
		})
		if err != nil {
			abortWithProjection(c, shared.ProjectInternalError(err))
			return
		}

		c.JSON(http.StatusOK, result)
	}
}

func handleListUsers(useCase ListUsersUseCase, timeout time.Duration) gin.HandlerFunc {
	return func(c *gin.Context) {
		input, err := buildListUsersInput(c)
		if err != nil {
			abortWithProjection(c, shared.ProjectInternalError(err))
			return
		}

		callCtx, cancel := context.WithTimeout(c.Request.Context(), timeout)
		defer cancel()

		result, err := useCase.Execute(callCtx, input)
		if err != nil {
			abortWithProjection(c, shared.ProjectInternalError(err))
			return
		}

		c.JSON(http.StatusOK, result)
	}
}

func buildListUsersInput(c *gin.Context) (adminusers.ListUsersInput, error) {
	pageSize, err := parseOptionalPageSize(c, "page_size")
	if err != nil {
		return adminusers.ListUsersInput{}, err
	}
	pageToken, err := parseOptionalPageToken(c, "page_token")
	if err != nil {
		return adminusers.ListUsersInput{}, err
	}
	paidExpiresBefore, err := parseOptionalRFC3339Query(c, "paid_expires_before")
	if err != nil {
		return adminusers.ListUsersInput{}, err
	}
	paidExpiresAfter, err := parseOptionalRFC3339Query(c, "paid_expires_after")
	if err != nil {
		return adminusers.ListUsersInput{}, err
	}
	canLogin, err := parseOptionalBoolQuery(c, "can_login")
	if err != nil {
		return adminusers.ListUsersInput{}, err
	}
	canCreatePrivateGame, err := parseOptionalBoolQuery(c, "can_create_private_game")
	if err != nil {
		return adminusers.ListUsersInput{}, err
	}
	canJoinGame, err := parseOptionalBoolQuery(c, "can_join_game")
	if err != nil {
		return adminusers.ListUsersInput{}, err
	}

	return adminusers.ListUsersInput{
		PageSize:             pageSize,
		PageToken:            pageToken,
		PaidState:            c.Query("paid_state"),
		PaidExpiresBefore:    paidExpiresBefore,
		PaidExpiresAfter:     paidExpiresAfter,
		DeclaredCountry:      c.Query("declared_country"),
		SanctionCode:         c.Query("sanction_code"),
		LimitCode:            c.Query("limit_code"),
		UserName:             c.Query("user_name"),
		DisplayName:          c.Query("display_name"),
		DisplayNameMatch:     c.Query("display_name_match"),
		CanLogin:             canLogin,
		CanCreatePrivateGame: canCreatePrivateGame,
		CanJoinGame:          canJoinGame,
	}, nil
}

func parseOptionalPageSize(c *gin.Context, name string) (int, error) {
	raw, present := c.GetQuery(name)
	if !present {
		return 0, nil
	}

	value, err := strconv.Atoi(strings.TrimSpace(raw))
	if err != nil || value < 1 || value > 200 {
		return 0, shared.InvalidRequest("page_size must be between 1 and 200")
	}

	return value, nil
}

func parseOptionalPageToken(c *gin.Context, name string) (string, error) {
	raw, present := c.GetQuery(name)
	if !present {
		return "", nil
	}
	if strings.TrimSpace(raw) != raw {
		return "", shared.InvalidRequest("page_token must not contain surrounding whitespace")
	}

	return raw, nil
}

func parseOptionalRFC3339Query(c *gin.Context, name string) (*time.Time, error) {
	raw, present := c.GetQuery(name)
	if !present {
		return nil, nil
	}

	parsed, err := time.Parse(time.RFC3339, strings.TrimSpace(raw))
	if err != nil {
		return nil, shared.InvalidRequest(name + " must be a valid RFC 3339 timestamp")
	}

	return &parsed, nil
}

func parseOptionalBoolQuery(c *gin.Context, name string) (*bool, error) {
	raw, present := c.GetQuery(name)
	if !present {
		return nil, nil
	}

	parsed, err := strconv.ParseBool(strings.TrimSpace(raw))
	if err != nil {
		return nil, shared.InvalidRequest(name + " must be a valid boolean")
	}

	return &parsed, nil
}