// Shared by the REST API and HTTP/WebSocket API panels.

/** The runtime endpoint as the browser can reach it, for building invoke URLs. */
export function invokeEndpoint(runtimeEndpoint?: string): string | null {
    if (!runtimeEndpoint) return null
    try {
        const endpoint = new URL(runtimeEndpoint)
        if (isDockerBridgeAddress(endpoint.hostname) && typeof window !== 'undefined') {
            endpoint.hostname = window.location.hostname
        }
        return endpoint.toString().replace(/\/$/, '')
    } catch {
        return runtimeEndpoint.replace(/\/$/, '')
    }
}

function isDockerBridgeAddress(hostname: string): boolean {
    const octets = hostname.split('.').map(Number)
    return octets.length === 4
        && octets.every((octet) => Number.isInteger(octet) && octet >= 0 && octet <= 255)
        && octets[0] === 172
        && octets[1] >= 16
        && octets[1] <= 31
}

export function parseHeaders(value: string): Record<string, string> {
    let parsed: unknown
    try {
        parsed = JSON.parse(value || '{}')
    } catch {
        throw new Error('Request headers must be valid JSON.')
    }
    if (!parsed || typeof parsed !== 'object' || Array.isArray(parsed) || Object.values(parsed).some((header) => typeof header !== 'string')) {
        throw new Error('Request headers must be a JSON object with string values.')
    }
    return parsed as Record<string, string>
}

export function formatResponseBody(body: string): string {
    try {
        return JSON.stringify(JSON.parse(body), null, 2)
    } catch {
        return body || '(empty response body)'
    }
}