package migration

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"strings"

	"git.gyulakerezsi.ro/migrate-github/utils"
)

type client struct {
	apiURL     string
	pat        string
	httpClient *http.Client
	User       *userResponse
}

type userResponse struct {
	Username string `json:"username"`
	ID       int    `json:"id"`
}

type migrateRequest struct {
	CloneAddr   string `json:"clone_addr"`
	UID         int    `json:"uid"`
	RepoName    string `json:"repo_name"`
	Description string `json:"description"`
}

// Migrate will send a migrate request to the gogs server
func (c *client) Migrate(cloneURL, description, targetName string) error {
	jsonBody, err := json.Marshal(&migrateRequest{cloneURL, c.User.ID, targetName, description})
	utils.PanicOnError(err)

	req, err := http.NewRequest(http.MethodPost, c.apiURL+"repos/migrate", bytes.NewReader(jsonBody))
	utils.PanicOnError(err)

	c.setHeadersOnRequest(req)

	resp, err := c.httpClient.Do(req)
	utils.PanicOnError(err)

	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		return fmt.Errorf("got non-success status code: %s\n==========request=========\n%+v\n=================response=============\n%+v", resp.Status, req, resp)
	}

	return nil
}

func (c *client) setHeadersOnRequest(req *http.Request) {
	req.Header.Set("Authorization", "token "+c.pat)
	req.Header.Set("Accept", "application/json")

	if req.Method == http.MethodPost {
		req.Header.Set("Content-Type", "application/json")
	}
}

func (c *client) getUIDFromGogs() {
	req, err := http.NewRequest(http.MethodGet, c.apiURL+"user", http.NoBody)
	utils.PanicOnError(err)
	c.setHeadersOnRequest(req)

	response, err := c.httpClient.Do(req)
	utils.PanicOnError(err)

	user := userResponse{}
	utils.UnmarshalFromResponse(response, &user)
	c.User = &user
}

// NewClient creates new migrationClient
func NewClient(baseURL, pat string) *client {
	client := &client{}
	client.apiURL = strings.TrimRight(baseURL, "/") + "/api/v1/"
	client.pat = pat
	client.httpClient = &http.Client{}
	client.getUIDFromGogs()

	return client
}