import { describe, expect, it } from "vitest";
import { getAgentSettings, setAgentSettings } from "./agent-settings";

// ---------------------------------------------------------------------------
// Helpers — drill into the written `[thinking]` / `[loop_control]` sections
// ---------------------------------------------------------------------------

function thinkingOf(raw: unknown): Record<string, unknown> {
  const t = (raw as { thinking?: unknown })?.thinking;
  return t && typeof t === "object" && !Array.isArray(t)
    ? (t as Record<string, unknown>)
    : {};
}

function loopOf(raw: unknown): Record<string, unknown> {
  const l = (raw as { loop_control?: unknown })?.loop_control;
  return l && typeof l === "object" && !Array.isArray(l)
    ? (l as Record<string, unknown>)
    : {};
}

// ---------------------------------------------------------------------------
// Reading — legacy off values normalized to "off", "max" → "high"
// ---------------------------------------------------------------------------

describe("getAgentSettings — thinking.keep normalization", () => {
  it("normalizes a legacy boolean `false` to \"off\"", () => {
    expect(getAgentSettings({ thinking: { keep: false } }).thinking?.keep).toBe(
      "off"
    );
  });

  it("normalizes the other legacy off values (0, null, \"no\", \"none\") to \"off\"", () => {
    for (const v of [0, null, "no", "none"]) {
      expect(
        getAgentSettings({ thinking: { keep: v } }).thinking?.keep
      ).toBe("off");
    }
  });

  it("keeps \"all\" and \"off\" as-is on read", () => {
    expect(getAgentSettings({ thinking: { keep: "all" } }).thinking?.keep).toBe(
      "all"
    );
    expect(getAgentSettings({ thinking: { keep: "off" } }).thinking?.keep).toBe(
      "off"
    );
  });

  it("keeps the default \"all\" when the key is absent", () => {
    expect(getAgentSettings({}).thinking?.keep).toBe("all");
  });
});

describe("getAgentSettings — effort \"max\" read mapping", () => {
  it("normalizes a stored \"max\" to \"high\" on read", () => {
    expect(getAgentSettings({ thinking: { effort: "max" } }).thinking?.effort).toBe(
      "high"
    );
  });
});

// ---------------------------------------------------------------------------
// Writing — keep: "all" round-trips, "off" is written for legacy off values,
// absent keep is not materialized
// ---------------------------------------------------------------------------

describe("setAgentSettings — keep serialization", () => {
  it("round-trips keep = \"all\"", () => {
    const raw = { thinking: { keep: "all" } };
    const next = setAgentSettings(raw, { thinking: { keep: "all" } });
    expect(thinkingOf(next).keep).toBe("all");
  });

  it("writes \"off\" (string) for a legacy keep = false, never a boolean", () => {
    const next = setAgentSettings({ thinking: { keep: false } }, {});
    expect(thinkingOf(next).keep).toBe("off");
  });

  it("does not write the keep key when it was never set (absent in raw and patch)", () => {
    expect(thinkingOf(setAgentSettings({}, {}))).not.toHaveProperty("keep");
    const next = setAgentSettings(
      { thinking: { enabled: true } },
      { thinking: { effort: "high" } }
    );
    expect(thinkingOf(next)).not.toHaveProperty("keep");
    expect(thinkingOf(next).effort).toBe("high");
  });

  it("writes the key when an absent raw config's keep is explicitly toggled off", () => {
    const next = setAgentSettings({}, { thinking: { keep: "off" } });
    expect(thinkingOf(next).keep).toBe("off");
  });
});

// ---------------------------------------------------------------------------
// loop_control — v2 default writes only max_attempts_per_step; legacyV1 opts
// dual-writes; read fallback from the v1 key is preserved
// ---------------------------------------------------------------------------

describe("loop_control — v1/v2 key handling", () => {
  const raw = { loop_control: { max_attempts_per_step: 5, max_retries_per_step: 5 } };

  it("default (v2): a save strips the legacy max_retries_per_step key", () => {
    const next = setAgentSettings(raw, { loop_control: { reserved_context_size: 60000 } });
    expect(loopOf(next).max_attempts_per_step).toBe(5);
    expect(loopOf(next)).not.toHaveProperty("max_retries_per_step");
  });

  it("default (v2): a dual-write patch ends up with only the v2 key", () => {
    const next = setAgentSettings(
      raw,
      { loop_control: { max_attempts_per_step: 7, max_retries_per_step: 7 } }
    );
    expect(loopOf(next).max_attempts_per_step).toBe(7);
    expect(loopOf(next)).not.toHaveProperty("max_retries_per_step");
  });

  it("legacyV1: both keys are written", () => {
    const next = setAgentSettings(
      raw,
      { loop_control: { max_attempts_per_step: 7, max_retries_per_step: 7 } },
      { legacyV1: true }
    );
    expect(loopOf(next).max_attempts_per_step).toBe(7);
    expect(loopOf(next).max_retries_per_step).toBe(7);
  });

  it("read fallback keeps a max_retries_per_step-only config editable", () => {
    const s = getAgentSettings({ loop_control: { max_retries_per_step: 4 } });
    expect(s.loop_control?.max_attempts_per_step).toBe(4);
    expect(s.loop_control?.max_retries_per_step).toBe(4);
  });
});

// ---------------------------------------------------------------------------
// loop_control.compaction_max_attempts (kimi-code 0.43.0) — read via the loop
// spread, written only when set, and 0/empty removes the key (upstream
// default 5 applies)
// ---------------------------------------------------------------------------

describe("loop_control.compaction_max_attempts", () => {
  it("reads an existing value through the loop spread", () => {
    expect(
      getAgentSettings({ loop_control: { compaction_max_attempts: 7 } })
        .loop_control?.compaction_max_attempts
    ).toBe(7);
  });

  it("reads as undefined when the key is absent (UI falls back to 5)", () => {
    expect(
      getAgentSettings({ loop_control: {} }).loop_control?.compaction_max_attempts
    ).toBeUndefined();
  });

  it("writes the value when the patch sets it", () => {
    const next = setAgentSettings({}, {
      loop_control: { compaction_max_attempts: 8 },
    });
    expect(loopOf(next).compaction_max_attempts).toBe(8);
  });

  it("drops the key for 0 and for a cleared (undefined) field", () => {
    const raw = { loop_control: { compaction_max_attempts: 6 } };
    expect(loopOf(setAgentSettings(raw, {
      loop_control: { compaction_max_attempts: 0 },
    }))).not.toHaveProperty("compaction_max_attempts");
    expect(loopOf(setAgentSettings(raw, {
      loop_control: { compaction_max_attempts: undefined },
    }))).not.toHaveProperty("compaction_max_attempts");
  });

  it("does not materialize the upstream default on an unrelated save", () => {
    // An absent key must stay absent — a plain save must not pin `5`.
    const next = setAgentSettings({ thinking: { effort: "high" } }, {});
    expect(loopOf(next)).not.toHaveProperty("compaction_max_attempts");
    // An existing value survives a save that does not touch it.
    const kept = setAgentSettings(
      { loop_control: { compaction_max_attempts: 4 } },
      { thinking: { effort: "low" } }
    );
    expect(loopOf(kept).compaction_max_attempts).toBe(4);
  });
});

// ---------------------------------------------------------------------------
// [watch] enabled (kimi-code 2.0.1+) — top-level section, off by default since
// 2.0.2; mirrors the [background] handling
// ---------------------------------------------------------------------------

function watchOf(raw: unknown): Record<string, unknown> {
  const w = (raw as { watch?: unknown })?.watch;
  return w && typeof w === "object" && !Array.isArray(w)
    ? (w as Record<string, unknown>)
    : {};
}

describe("[watch] enabled", () => {
  it("reads as false when the section or key is absent (2.0.2 default)", () => {
    expect(getAgentSettings({}).watch?.enabled).toBe(false);
    expect(getAgentSettings({ watch: {} }).watch?.enabled).toBe(false);
  });

  it("reads an explicit value", () => {
    expect(getAgentSettings({ watch: { enabled: true } }).watch?.enabled).toBe(true);
    expect(getAgentSettings({ watch: { enabled: false } }).watch?.enabled).toBe(false);
  });

  it("writes the top-level [watch] section", () => {
    const next = setAgentSettings({}, { watch: { enabled: true } }) as {
      watch?: Record<string, unknown>;
    };
    expect(next.watch).toEqual({ enabled: true });
  });

  it("keeps the section on saves that do not touch it", () => {
    const next = setAgentSettings(
      { watch: { enabled: true } },
      { thinking: { effort: "high" } }
    ) as { watch?: Record<string, unknown> };
    expect(next.watch).toEqual({ enabled: true });
  });

  it("does not disturb the other managed sections", () => {
    const next = setAgentSettings(
      { background: { max_running_tasks: 2 } },
      { watch: { enabled: true } }
    ) as { background?: Record<string, unknown> };
    expect(next.background?.max_running_tasks).toBe(2);
    expect(watchOf(next).enabled).toBe(true);
  });
});


describe("permission.dangerous_command_guard", () => {
  it("reads as undefined when the key is absent (default on)", () => {
    expect(
      getAgentSettings({}).permission?.dangerous_command_guard
    ).toBeUndefined();
    expect(
      getAgentSettings({ permission: { rules: [] } }).permission
        ?.dangerous_command_guard
    ).toBeUndefined();
  });

  it("reads an explicit true / false", () => {
    expect(
      getAgentSettings({ permission: { dangerous_command_guard: false } })
        .permission?.dangerous_command_guard
    ).toBe(false);
    expect(
      getAgentSettings({ permission: { dangerous_command_guard: true } })
        .permission?.dangerous_command_guard
    ).toBe(true);
  });

  it("writes guard=false even with no rules (section kept)", () => {
    const next = setAgentSettings(
      {},
      { permission: { rules: [], dangerous_command_guard: false } }
    ) as { permission?: Record<string, unknown> };
    expect(next.permission).toEqual({ dangerous_command_guard: false });
  });

  it("writes guard together with rules", () => {
    const rules = [{ decision: "allow" as const, pattern: "Read" }];
    const next = setAgentSettings(
      {},
      { permission: { rules, dangerous_command_guard: true } }
    ) as { permission?: Record<string, unknown> };
    expect(next.permission).toEqual({
      rules,
      dangerous_command_guard: true,
    });
  });

  it("a rules-only update carries the existing guard through", () => {
    const raw = { permission: { dangerous_command_guard: false } };
    const next = setAgentSettings(raw, {
      permission: { rules: [{ decision: "deny" as const, pattern: "Bash" }] },
    }) as { permission?: Record<string, unknown> };
    expect(next.permission?.dangerous_command_guard).toBe(false);
    expect(next.permission?.rules).toHaveLength(1);
  });

  it("omits an empty rules array; keeps an explicit guard on plain saves", () => {
    const raw = { permission: { dangerous_command_guard: true } };
    const off = setAgentSettings(raw, {
      permission: { rules: [], dangerous_command_guard: false },
    }) as { permission?: Record<string, unknown> };
    expect(off.permission).toEqual({ dangerous_command_guard: false });
    expect(off.permission).not.toHaveProperty("rules");
    // An explicit true is materialized on plain saves (harmless, and it
    // documents the state the UI toggle shows).
    const on = setAgentSettings(raw, {}) as {
      permission?: Record<string, unknown>;
    };
    expect(on.permission).toEqual({ dangerous_command_guard: true });
  });
});