// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.

package drivers

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"time"

	"go.probo.inc/probo/pkg/coredata"
)

type OpenAIDriver struct {
	httpClient *http.Client
}

var _ Driver = (*OpenAIDriver)(nil)

type openaiUsersResponse struct {
	Data []struct {
		ID       string `json:"id"`
		Email    string `json:"email"`
		Name     string `json:"name"`
		Role     string `json:"role"`
		AddedAt  int64  `json:"added_at"`
		Disabled bool   `json:"disabled"`
	} `json:"data"`
	HasMore bool   `json:"has_more"`
	LastID  string `json:"last_id"`
}

const openaiUsersEndpoint = "https://api.openai.com/v1/organization/users"

func NewOpenAIDriver(httpClient *http.Client) *OpenAIDriver {
	return &OpenAIDriver{
		httpClient: httpClient,
	}
}

func (d *OpenAIDriver) ListAccounts(ctx context.Context) ([]AccountRecord, error) {
	var (
		records []AccountRecord
		after   string
	)

	for range maxPaginationPages {
		resp, err := d.fetchUsers(ctx, after)
		if err != nil {
			return nil, err
		}

		for _, u := range resp.Data {
			record := AccountRecord{
				Email:       u.Email,
				FullName:    u.Name,
				Role:        openaiRole(u.Role),
				Active:      new(!u.Disabled),
				IsAdmin:     u.Role == "owner",
				ExternalID:  u.ID,
				MFAStatus:   coredata.MFAStatusUnknown,
				AuthMethod:  coredata.AccessEntryAuthMethodUnknown,
				AccountType: coredata.AccessEntryAccountTypeUser,
			}

			if u.AddedAt != 0 {
				t := time.Unix(u.AddedAt, 0)
				record.CreatedAt = &t
			}

			if record.Email != "" {
				records = append(records, record)
			}
		}

		if !resp.HasMore || resp.LastID == "" {
			return records, nil
		}

		after = resp.LastID
	}

	return nil, fmt.Errorf("cannot list all openai accounts: %w", ErrPaginationLimitReached)
}

func (d *OpenAIDriver) fetchUsers(ctx context.Context, after string) (*openaiUsersResponse, error) {
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, openaiUsersEndpoint, nil)
	if err != nil {
		return nil, fmt.Errorf("cannot create openai users request: %w", err)
	}

	q := req.URL.Query()
	q.Set("limit", "100")

	if after != "" {
		q.Set("after", after)
	}

	req.URL.RawQuery = q.Encode()

	req.Header.Set("Accept", "application/json")

	httpResp, err := d.httpClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("cannot execute openai users request: %w", err)
	}

	defer func() {
		_ = httpResp.Body.Close()
	}()

	if httpResp.StatusCode < 200 || httpResp.StatusCode >= 300 {
		return nil, fmt.Errorf("cannot fetch openai users: unexpected status %d", httpResp.StatusCode)
	}

	var resp openaiUsersResponse
	if err := json.NewDecoder(httpResp.Body).Decode(&resp); err != nil {
		return nil, fmt.Errorf("cannot decode openai users response: %w", err)
	}

	return &resp, nil
}

func openaiRole(role string) string {
	switch role {
	case "owner":
		return "Owner"
	case "reader":
		return "Reader"
	default:
		return "Member"
	}
}