package roles

import (
	"fmt"
	"strings"
	"xcecli/common/output"
	"xcecli/common/request"
	"xcecli/config"
	logger "xcecli/config"
	role_filter "xcecli/filters"
	"xcecli/models"

	"github.com/spf13/cobra"
	"go.uber.org/zap"
)

type RolesQuerier struct {
	configManager *config.ConfigManager
	filter        *role_filter.RolesFilter
	fields        string
	jsonOutput    bool
	noHeader      bool
	verbose       bool
	wideFormat    bool // wide format
}

func NewRolesQuerier(configManager *config.ConfigManager) *RolesQuerier {
	return &RolesQuerier{
		configManager: configManager,
		filter:        &role_filter.RolesFilter{},
	}
}

func NewListRolesCmd(configManager *config.ConfigManager) *cobra.Command {
	rolesQuerier := NewRolesQuerier(configManager)

	cmd := &cobra.Command{
		Use:   "list",
		Short: "Query role info",
		Long: `Query role info, support filter by role.
example:
  xce roles list                           # query all roles
  xce roles list -l                        # query all roles with detail
  xce roles list -w                        # list roles with wide format`,

		RunE: func(cmd *cobra.Command, args []string) error {
			if err := rolesQuerier.ParseCmdArgs(cmd, args); err != nil {
				fmt.Println(strings.ToLower(err.Error()))
				return nil
			}
			if err := rolesQuerier.RunRolesInfo("list"); err != nil {
				fmt.Println(strings.ToLower(err.Error()))
				return nil
			}
			return nil
		},
	}

	// Add command line parameters
	flags := cmd.Flags()
	flags.StringVarP(&rolesQuerier.filter.RoleName, "role", "r", "", "filter by role name")
	flags.StringVarP(&rolesQuerier.filter.Type, "type", "t", "", "output for all or builtin roles")
	//flags.StringVarP(&rolesQuerier.fields, "output", "o", "", "output fields for roles")
	flags.BoolVarP(&rolesQuerier.wideFormat, "wided", "w", false, "output in wide format")
	flags.BoolVarP(&rolesQuerier.jsonOutput, "json", "", false, "output in JSON format")
	flags.BoolVarP(&rolesQuerier.noHeader, "noheader", "n", false, "output no header")

	return cmd
}

func (rq *RolesQuerier) ParseCmdArgs(cmd *cobra.Command, args []string) error {
	// No additional processing needed, all parameters are bound in flags
	if rq.filter.Type != "" && rq.filter.Type != "all" && rq.filter.Type != "builtin" {
		return fmt.Errorf("type must be either 'all' or 'builtin'")
	}
	if len(args) > 0 {
		rq.filter.RoleName = strings.Join(args, ",")
	}
	return nil
}

func (rq *RolesQuerier) RunRolesInfo(commandType string) error {
	// Get server information
	serverInfo, err := rq.configManager.GetServerInfo()
	if err != nil {
		return fmt.Errorf("failed to get server info: %w", err)
	}

	// create API client
	apiClient := request.NewAPIClient(serverInfo.URL)
	apiClient.SetRootCAs(serverInfo.CACert)

	// Create query parameters
	params := make(map[string]string)

	// Get filter string
	filterStr, err := rq.filter.HandleRoleFilter()

	if err != nil {
		errMsg := request.ExtractErrorMessage(err)
		return fmt.Errorf("failed to get filter: [%s]", errMsg)
	} else if filterStr != "" {
		params["filter"] = filterStr
	}

	// Field mapping

	// Process field selection
	// for list, only display role_name column; deduplication is done client-side
	if commandType == "list" {
		rq.fields = "ROLE_NAME"
		params["fields"] = "role_name"
	} else {
		fieldsMap := models.RoleFieldsMap
		if rq.verbose && rq.fields == "" {
			for header := range fieldsMap {
				rq.fields += header + ","
			}
			rq.fields = strings.TrimSuffix(rq.fields, ",")
		}

		if rq.fields != "" {
			rq.fields = request.CleanFields(rq.fields)
			mappedFields, err := request.CheckAndMapFields(rq.fields, fieldsMap)
			if err != nil {
				return err
			}
			params["fields"] = strings.Join(mappedFields, ",")
		}
	}

	if rq.filter.Type != "" {
		params["type"] = rq.filter.Type
	}
	// create page printer
	pagePrinter := output.NewPagePrinter(output.DataTypeRoles, output.WithFields(rq.fields),
		output.WithFormatJson(rq.jsonOutput), output.WithNoHeader(rq.noHeader),
		output.WithVerbose(rq.verbose), output.WithWideFormat(rq.wideFormat))

	// Record if the first page has been processed
	isFirstPage := true

	var (
		resp      models.RolesResponse
		loopCount int
		pageToken string
		seen      map[string]struct{} // cross-page dedup state for list mode
	)
	if commandType == "list" {
		seen = make(map[string]struct{})
	}

	// Loop to get all pages of data
	for {
		if loopCount > 0 && pageToken == "" {
			break
		}
		resp = models.RolesResponse{} // reset to avoid stale rows from previous page
		err = apiClient.GetRequestFromAPIServer(serverInfo.Token, pageToken, serverInfo.CACert, "/xce/v1/roles", &resp, params)
		if err != nil {
			return err
		}
		if resp.Data.Count == 0 {
			if isFirstPage {
				fmt.Println("no role found")
				return nil
			}
		}
		// For list mode, deduplicate role names client-side before printing
		if commandType == "list" {
			var unique []models.RoleInfo
			for _, row := range resp.Data.Rows {
				if _, ok := seen[row.RoleName]; !ok {
					seen[row.RoleName] = struct{}{}
					unique = append(unique, models.RoleInfo{RoleName: row.RoleName})
				}
			}
			resp.Data.Rows = unique
			resp.Data.Count = len(unique)
		}
		// Process the first page
		if isFirstPage {
			// Start printing process
			pagePrinter.StartPrinting()
			// Prepare for printing, calculate column width and table header, etc.
			pagePrinter.PrepareForPrinting(&resp)
			isFirstPage = false
		}
		// Print the current page
		pagePrinter.PrintPage(&resp)

		// Update page token and loop counter
		pageToken = resp.Data.PageToken
		loopCount++
	}

	// Finish printing
	pagePrinter.Finish()

	logger.Debug("roles response completed", zap.Int("pages", loopCount))
	return nil
}

// uniqueRoleNames deduplicates role names from a RolesResponse, preserving order.
// The server returns one row per permission, so the same role_name appears multiple times.
func uniqueRoleNames(resp *models.RolesResponse) []string {
	seen := make(map[string]struct{})
	var result []string
	for _, row := range resp.Data.Rows {
		if _, ok := seen[row.RoleName]; !ok {
			seen[row.RoleName] = struct{}{}
			result = append(result, row.RoleName)
		}
	}
	return result
}