import { describe, expect, it } from "@suaveplan/testing/runner";
import type { Clock, LoggerLike } from "@suaveplan/types";
import { parseConfig } from "../config/config.js";
import { CADDY_IMGPROXY_CODES } from "../error-codes/error-codes.js";
import { ImgproxyHandler, NOOP_LOGGER } from "./handler.js";

function makeLogger(): {
    logger: LoggerLike;
    warns: Array<{
        message: string;
        context?: Readonly<Record<string, unknown>>;
    }>;
} {
    const warns: Array<{
        message: string;
        context?: Readonly<Record<string, unknown>>;
    }> = [];
    return {
        warns,
        logger: {
            debug: () => undefined,
            info: () => undefined,
            warn: (message, context) => {
                warns.push({ message, context });
            },
            error: () => undefined,
        },
    };
}

describe("ImgproxyHandler", () => {
    it("rewrites a valid imgproxy URL", { timeout: 5000 }, () => {
        const config = parseConfig({
            defaultWidth: 800,
            key: "aa11bbcc",
            salt: "deadbeef",
        });
        const handler = new ImgproxyHandler({ config });
        const result = handler.rewrite({
            path: "/uv16:9/avatar.png",
            host: "images.example.com",
        });
        if (!result.rewritten) {
            throw new Error("expected rewritten=true");
        }
        expect(result.operation).toBe("cover");
        expect(result.targetPath.startsWith("/")).toBe(true);
        expect(result.targetPath).toContain("rs:fill:800:450");
        expect(result.targetPath).toContain(
            "plain/s3://images/example.com/avatar@png"
        );
    });

    it("records caddy_imgproxy_rewrite_duration_ms via the injected clock", {
        timeout: 5000,
    }, () => {
        let tick = 1000;
        const clock: Clock = () => {
            tick += 5;
            return tick;
        };
        const config = parseConfig({});
        const handler = new ImgproxyHandler({ config, clock });
        const result = handler.rewrite({
            path: "/uv16:9/avatar.png",
            host: "images.example.com",
        });
        expect(result.rewritten).toBe(true);
        // No exception means the clock-driven duration was recorded.
    });

    it("reports passthrough for /unsafe paths", { timeout: 5000 }, () => {
        const config = parseConfig({});
        const handler = new ImgproxyHandler({ config });
        const result = handler.rewrite({
            path: "/unsafe/foo/bar.png",
            host: "example.com",
        });
        expect(result).toEqual({
            rewritten: false,
            reason: "passthrough",
        });
    });

    it("reports passthrough for /health paths", { timeout: 5000 }, () => {
        const config = parseConfig({});
        const handler = new ImgproxyHandler({ config });
        const result = handler.rewrite({
            path: "/health",
            host: "example.com",
        });
        expect(result).toEqual({
            rewritten: false,
            reason: "passthrough",
        });
    });

    it("reports invalid for unparsable paths and warns the logger", {
        timeout: 5000,
    }, () => {
        const { logger, warns } = makeLogger();
        const config = parseConfig({});
        const handler = new ImgproxyHandler({ config, logger });
        const result = handler.rewrite({
            path: "/garbage",
            host: "example.com",
        });
        if (result.rewritten !== false || result.reason !== "invalid") {
            throw new Error("expected invalid result");
        }
        expect(result.errorCode).toBe(CADDY_IMGPROXY_CODES.INVALID_URL);
        expect(result.errorMessage.length).toBeGreaterThan(0);
        expect(warns.length).toBe(1);
        expect(warns[0]?.context?.code).toBe(CADDY_IMGPROXY_CODES.INVALID_URL);
    });

    it("raises INVALID_HOST when host is empty", { timeout: 5000 }, () => {
        const { logger, warns } = makeLogger();
        const config = parseConfig({});
        const handler = new ImgproxyHandler({ config, logger });
        const result = handler.rewrite({
            path: "/uv16:9/avatar.png",
            host: "",
        });
        if (result.rewritten !== false || result.reason !== "invalid") {
            throw new Error("expected invalid result");
        }
        expect(result.errorCode).toBe(CADDY_IMGPROXY_CODES.INVALID_HOST);
        expect(warns.length).toBe(1);
    });

    it("uses the default no-op logger when not supplied", {
        timeout: 5000,
    }, () => {
        const config = parseConfig({});
        const handler = new ImgproxyHandler({ config });
        // No logger provided — default no-op must absorb the warn call.
        const result = handler.rewrite({
            path: "/garbage",
            host: "example.com",
        });
        expect(result.rewritten).toBe(false);
    });

    it("NOOP_LOGGER every method is callable and returns undefined", {
        timeout: 5000,
    }, () => {
        expect(NOOP_LOGGER.debug("msg")).toBeUndefined();
        expect(NOOP_LOGGER.info("msg")).toBeUndefined();
        expect(NOOP_LOGGER.warn("msg")).toBeUndefined();
        expect(NOOP_LOGGER.error("msg")).toBeUndefined();
    });
});