package check

import (
	"fmt"
	"strings"
)

// A change that adds or modifies a compiled program fails (issue 1577): it is build output, `go build` in a module's folder
// writes one beside go.mod, and `git add -A` takes it. The build module's fetch step, which holds the merged clone, reads the
// first bytes of each changed file and reports the programs (the build modules' fetch tools); the checker judges the answer.

// checkBinariesOf fails a pull request whose change adds or modifies a compiled program, naming each file. It judges the
// first fetch answer of the pull request, whichever build module gave it. A fetch that made the merge and names no program has
// none: the answer's `programs` is an omitted empty list (B2g), and `merge` tells a preview was made.
func (st *state) checkBinariesOf(t *target) verdictPtr {
	key := fmt.Sprintf("%s#%d", t.pull.Repository, t.pull.Number)
	if t.fetched.Merge == "" {
		return nil // no merge was made: nothing was changed to judge
	}
	var found []string
	for _, p := range t.fetched.Programs {
		if p.Commit != "" {
			found = append(found, fmt.Sprintf("%s: a compiled program added in %s and removed later: it stays in history; squash the branch (issue 1577)", p.Path, short12(p.Commit)))
			continue
		}
		found = append(found, p.Path+": a compiled program is build output: remove it and add it to .gitignore (issue 1577)")
	}
	if len(found) > 0 {
		return failed(t.node, fmt.Sprintf("%s: %s", key, strings.Join(found, "; ")))
	}
	return nil
}