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// This entire file is heavily derived from Tailscale's gitops-pusher

package main

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"os"
	"regexp"
	"strings"

	"github.com/tailscale/hujson"
)

func ApplyNewACL(ctx context.Context, client *http.Client, tailnet, apiKey, policyFname, oldEtag string) error {
	fin, err := os.Open(policyFname)
	if err != nil {
		return err
	}
	defer fin.Close()

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, fmt.Sprintf("https://api.tailscale.com/api/v2/tailnet/%s/acl", tailnet), fin)
	if err != nil {
		return err
	}

	req.SetBasicAuth(apiKey, "")
	req.Header.Set("Content-Type", "application/hujson")

	resp, err := client.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	got := resp.StatusCode
	want := http.StatusOK
	if got != want {
		var ate ACLGitopsTestError
		err := json.NewDecoder(resp.Body).Decode(&ate)
		if err != nil {
			return err
		}

		return ate
	}

	return nil
}

func TestNewACLs(ctx context.Context, client *http.Client, tailnet, apiKey, policyFname string) error {
	data, err := os.ReadFile(policyFname)
	if err != nil {
		return err
	}
	data, err = hujson.Standardize(data)
	if err != nil {
		return err
	}

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, fmt.Sprintf("https://api.tailscale.com/api/v2/tailnet/%s/acl/validate", tailnet), bytes.NewBuffer(data))
	if err != nil {
		return err
	}

	req.SetBasicAuth(apiKey, "")
	req.Header.Set("Content-Type", "application/hujson")

	resp, err := client.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	var ate ACLGitopsTestError
	err = json.NewDecoder(resp.Body).Decode(&ate)
	if err != nil {
		return err
	}

	if len(ate.Message) != 0 || len(ate.Data) != 0 {
		return ate
	}

	got := resp.StatusCode
	want := http.StatusOK
	if got != want {
		return fmt.Errorf("wanted HTTP status code %d but got %d", want, got)
	}

	return nil
}

var lineColMessageSplit = regexp.MustCompile(`line ([0-9]+), column ([0-9]+): (.*)$`)

// ACLGitopsTestError is redefined here so we can add a custom .Error() response
type ACLGitopsTestError struct {
	ACLTestError
}

func (ate ACLGitopsTestError) Error() string {
	var sb strings.Builder

	fmt.Fprintln(&sb, ate.Message)
	fmt.Fprintln(&sb)

	for _, data := range ate.Data {
		if data.User != "" {
			fmt.Fprintf(&sb, "For user %s:\n", data.User)
		}

		if len(data.Errors) > 0 {
			fmt.Fprint(&sb, "Errors found:\n")
			for _, err := range data.Errors {
				fmt.Fprintf(&sb, "- %s\n", err)
			}
		}

		if len(data.Warnings) > 0 {
			fmt.Fprint(&sb, "Warnings found:\n")
			for _, err := range data.Warnings {
				fmt.Fprintf(&sb, "- %s\n", err)
			}
		}
	}

	return sb.String()
}

// ACLTestError is ErrResponse but with an extra field to account for ACLTestFailureSummary.
type ACLTestError struct {
	ErrResponse
	Data []ACLTestFailureSummary `json:"data"`
}

func (e ACLTestError) Error() string {
	return fmt.Sprintf("%s, Data: %+v", e.ErrResponse.Error(), e.Data)
}

// ACLTestFailureSummary specifies a user for which ACL tests
// failed and the related user-friendly error messages.
//
// ACLTestFailureSummary specifies the JSON format sent to the
// JavaScript client to be rendered in the HTML.
type ACLTestFailureSummary struct {
	// User is the source ("src") value of the ACL test that failed.
	// The name "user" is a legacy holdover from the original naming and
	// is kept for compatibility but it may also contain any value
	// that's valid in a ACL test "src" field.
	User string `json:"user,omitempty"`

	Errors   []string `json:"errors,omitempty"`
	Warnings []string `json:"warnings,omitempty"`
}

// ErrResponse is the HTTP error returned by the Tailscale server.
type ErrResponse struct {
	Status  int
	Message string
}

func (e ErrResponse) Error() string {
	return fmt.Sprintf("Status: %d, Message: %q", e.Status, e.Message)
}