package client

import (
	"context"
	"fmt"
	"net/url"

	"forge.cadoles.com/Cadoles/emissary/internal/datastore"
	"github.com/pkg/errors"
)

type QueryAgentsOptionFunc func(*QueryAgentsOptions)

type QueryAgentsOptions struct {
	Options     []OptionFunc
	Limit       *int
	Offset      *int
	Thumbprints []string
	IDs         []AgentID
	Statuses    []AgentStatus
}

func WithQueryAgentsOptions(funcs ...OptionFunc) QueryAgentsOptionFunc {
	return func(opts *QueryAgentsOptions) {
		opts.Options = funcs
	}
}

func WithQueryAgentsLimit(limit int) QueryAgentsOptionFunc {
	return func(opts *QueryAgentsOptions) {
		opts.Limit = &limit
	}
}

func WithQueryAgentsOffset(offset int) QueryAgentsOptionFunc {
	return func(opts *QueryAgentsOptions) {
		opts.Offset = &offset
	}
}

func WithQueryAgentsThumbprints(thumbprints ...string) QueryAgentsOptionFunc {
	return func(opts *QueryAgentsOptions) {
		opts.Thumbprints = thumbprints
	}
}

func WithQueryAgentsID(ids ...datastore.AgentID) QueryAgentsOptionFunc {
	return func(opts *QueryAgentsOptions) {
		opts.IDs = ids
	}
}

func WithQueryAgentsStatus(statuses ...datastore.AgentStatus) QueryAgentsOptionFunc {
	return func(opts *QueryAgentsOptions) {
		opts.Statuses = statuses
	}
}

func (c *Client) QueryAgents(ctx context.Context, funcs ...QueryAgentsOptionFunc) ([]*Agent, int, error) {
	options := &QueryAgentsOptions{}
	for _, fn := range funcs {
		fn(options)
	}

	query := url.Values{}

	if options.IDs != nil && len(options.IDs) > 0 {
		query.Set("ids", joinSlice(options.IDs))
	}

	if options.Thumbprints != nil && len(options.Thumbprints) > 0 {
		query.Set("thumbprints", joinSlice(options.Thumbprints))
	}

	if options.Statuses != nil && len(options.Statuses) > 0 {
		query.Set("statuses", joinSlice(options.Statuses))
	}

	path := fmt.Sprintf("/api/v1/agents?%s", query.Encode())

	response := withResponse[struct {
		Agents []*datastore.Agent `json:"agents"`
		Total  int                `json:"total"`
	}]()

	if options.Options == nil {
		options.Options = make([]OptionFunc, 0)
	}

	if err := c.apiGet(ctx, path, &response, options.Options...); err != nil {
		return nil, 0, errors.WithStack(err)
	}

	if response.Error != nil {
		return nil, 0, errors.WithStack(response.Error)
	}

	return response.Data.Agents, response.Data.Total, nil
}