main.go

package codeforcesreport

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"os"
)

// https://codeforces.com/api/help/methods#user.status
type UserStatusResponse struct {
	Status string
	Result []*Submission
}

// https://codeforces.com/api/help/objects#Submission
type Submission struct {
	Id, ContestId, CreationTimeSeconds, RelativeTimeSeconds int64
	Problem                                                 *Problem
	ProgrammingLanguage                                     string
	Verdict                                                 string // "OK" means the submission works
	Testset                                                 string
	PassedTestCount                                         int
	TimeConsumedMillis, memoryConsumedBytes                 int
}

// https://codeforces.com/api/help/objects#Problem
type Problem struct {
	ContestId int
	Index     string
	Name      string
	Points    float64
	Tags      []string
}

// TODO: handle pagination
func FetchSubmissions(handle string) *UserStatusResponse {
	if !validateHandle(handle) {
		log.Fatal(fmt.Sprintf("Something wrong with the user handle %s, please take a look :)", os.Args[1]))
	}

	url := fmt.Sprintf("https://codeforces.com/api/user.status?handle=%s&from=1&count=1000&lang=en", handle)
	resp, err := http.Get(url)
	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()
	cfResp := &(UserStatusResponse{})
	if err := json.NewDecoder(resp.Body).Decode(cfResp); err != nil {
		log.Fatal(err)
	}
	if cfResp.Status != "OK" {
		log.Fatal("codeforces user.status API responded:", cfResp.Status)
	}
	return cfResp
}

func ParseUniqOkSubmissions(u *UserStatusResponse) []*Submission {
	solved, result := map[string]bool{}, []*Submission{}
	for _, v := range u.Result {
		id := fmt.Sprintf("%d/%s", v.Problem.ContestId, v.Problem.Index)
		if v.Verdict != "OK" || solved[id] {
			continue
		}

		solved[id], result = true, append(result, v)
	}
	return result
}

func validateHandle(h string) bool {
	// TODO
	return true
}