package tools

import (
	"testing"

	"git.d-ma.be/mathias/gitea-mcp/internal/gitea"
)

// The ship gate is the load-bearing safety of tbd_ship: it must NEVER return
// merge=true unless CI is fully green AND the base isn't review-protected.
// Every non-green / unknown / protected state fails closed to PR-only (#40).
func TestEvaluateShipGate(t *testing.T) {
	run := func(status, concl string) gitea.WorkflowRun {
		return gitea.WorkflowRun{Status: status, Conclusion: concl}
	}
	protected := &gitea.BranchProtection{Protected: true, RequiredApprovals: 1}
	open := &gitea.BranchProtection{Protected: false}

	tests := []struct {
		name      string
		runs      []gitea.WorkflowRun
		bp        *gitea.BranchProtection
		wantMerge bool
		wantCI    string
	}{
		{"all green → merge", []gitea.WorkflowRun{run("completed", "success")}, open, true, "success"},
		{"in_progress → no merge", []gitea.WorkflowRun{run("in_progress", "")}, open, false, "pending"},
		{"queued → no merge", []gitea.WorkflowRun{run("queued", "")}, open, false, "pending"},
		{"failed → no merge", []gitea.WorkflowRun{run("completed", "failure")}, open, false, "failed"},
		{"cancelled → no merge (fail-closed)", []gitea.WorkflowRun{run("completed", "cancelled")}, open, false, "failed"},
		{"no runs → no merge (no CI gate)", nil, open, false, "none"},
		{"mixed success+queued → no merge", []gitea.WorkflowRun{run("completed", "success"), run("queued", "")}, open, false, "pending"},
		{"green but protected → no merge", []gitea.WorkflowRun{run("completed", "success")}, protected, false, "success"},
		{"no runs + protected → no merge", nil, protected, false, "none"},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			g := evaluateShipGate(tc.runs, tc.bp)
			if g.merge != tc.wantMerge {
				t.Errorf("merge = %v, want %v (reason: %q)", g.merge, tc.wantMerge, g.reason)
			}
			if g.ciStatus != tc.wantCI {
				t.Errorf("ciStatus = %q, want %q", g.ciStatus, tc.wantCI)
			}
			if !tc.wantMerge && g.reason == "" {
				t.Errorf("no-merge decision must carry a reason")
			}
			if tc.wantMerge && g.reason != "" {
				t.Errorf("merge decision must have empty reason, got %q", g.reason)
			}
		})
	}
}