package main

import (
	"fmt"
	"sort"
	"strings"
)

func Leaderboard(results []Result) (string, error) {
	rows := append([]Result{}, results...)
	seen := map[string]bool{}
	total := -1
	var dataset, model string
	budget := -1
	for _, r := range rows {
		if r.DatasetSHA256 != "" || r.ModelConfigSHA256 != "" {
			dataset, model, budget = r.DatasetSHA256, r.ModelConfigSHA256, r.CallBudget
			break
		}
	}
	for _, r := range rows {
		if r.Harness == "" || r.Total <= 0 || r.Correct < 0 || r.Attempted < 0 || r.Errors < 0 || r.Attempted > r.Total || r.Correct+r.Errors > r.Attempted {
			return "", ErrInvalid
		}
		if r.Calls < 0 || r.CallBudget < 0 || (r.Calls > 0 && r.Calls < r.Attempted) {
			return "", ErrInvalid
		}
		if dataset != "" || model != "" {
			if dataset == "" || model == "" || r.DatasetSHA256 != dataset || r.ModelConfigSHA256 != model || r.CallBudget != budget {
				return "", ErrConflict
			}
			if r.Calls < r.Attempted || r.Calls > r.CallBudget {
				return "", ErrInvalid
			}
		}
		if seen[r.Harness] {
			return "", ErrConflict
		}
		seen[r.Harness] = true
		if total != -1 && total != r.Total {
			return "", ErrConflict
		}
		total = r.Total
	}
	sort.Slice(rows, func(i, j int) bool {
		if rows[i].Correct != rows[j].Correct {
			return rows[i].Correct > rows[j].Correct
		}
		if rows[i].Errors != rows[j].Errors {
			return rows[i].Errors < rows[j].Errors
		}
		return rows[i].Harness < rows[j].Harness
	})
	var out strings.Builder
	out.WriteString("SCOPED HARNESS COMPARISON\n")
	for _, r := range rows {
		fmt.Fprintf(&out, "%s correct=%d/%d attempted=%d errors=%d calls=%d/%d state=%s\n", r.Harness, r.Correct, r.Total, r.Attempted, r.Errors, r.Calls, r.CallBudget, r.State)
	}
	return out.String(), nil
}