package checker

import (
	"context"
	"fmt"

	sdk "git.happydns.org/checker-sdk-go/checker"
)

// Rules returns the full list of CheckRules the SIP checker exposes. Each
// rule covers a single concern so the UI can show granular pass/fail
// instead of a monolithic aggregate. Shared helpers live at the bottom of
// this file; per-concern logic is in rules_*.go.
func Rules() []sdk.CheckRule {
	return []sdk.CheckRule{
		&srvPresenceRule{},
		&transportDiversityRule{},
		&srvTargetsResolvableRule{},
		&endpointReachableRule{},
		&optionsResponseRule{},
		&optionsCapabilitiesRule{},
		&ipv6CoverageRule{},
		&tlsQualityRule{},
	}
}

// ─── Shared helpers ──────────────────────────────────────────────────

// loadSIPData fetches the SIP observation. On error, returns a CheckState
// the caller should emit to short-circuit its rule.
func loadSIPData(ctx context.Context, obs sdk.ObservationGetter) (*SIPData, *sdk.CheckState) {
	var data SIPData
	if err := obs.Get(ctx, ObservationKeySIP, &data); err != nil {
		return nil, &sdk.CheckState{
			Status:  sdk.StatusError,
			Message: fmt.Sprintf("failed to load SIP observation: %v", err),
			Code:    "sip.observation_error",
		}
	}
	return &data, nil
}

func statesFromIssues(issues []Issue) []sdk.CheckState {
	out := make([]sdk.CheckState, 0, len(issues))
	for _, is := range issues {
		out = append(out, issueToState(is))
	}
	return out
}

func issueToState(is Issue) sdk.CheckState {
	st := sdk.CheckState{
		Status:  severityToStatus(is.Severity),
		Message: is.Message,
		Code:    is.Code,
		Subject: is.Endpoint,
	}
	if is.Fix != "" {
		st.Meta = map[string]any{"fix": is.Fix}
	}
	return st
}

func passState(code, message string) sdk.CheckState {
	return sdk.CheckState{
		Status:  sdk.StatusOK,
		Message: message,
		Code:    code,
	}
}

func notTestedState(code, message string) sdk.CheckState {
	return sdk.CheckState{
		Status:  sdk.StatusUnknown,
		Message: message,
		Code:    code,
	}
}

func severityToStatus(sev string) sdk.Status {
	switch sev {
	case SeverityCrit:
		return sdk.StatusCrit
	case SeverityWarn:
		return sdk.StatusWarn
	case SeverityInfo:
		return sdk.StatusInfo
	default:
		return sdk.StatusOK
	}
}

// wantTLS returns whether the TLS transport was requested for this run.
// Mirrors the default at Collect time (all three transports probed when
// unset).
func wantTLS(opts sdk.CheckerOptions) bool {
	return sdk.GetBoolOption(opts, "probeTLS", true)
}