import { describe, expect, it } from "vitest";

import type { ReducedState, TranscriptRow } from "../../types.js";
import {
  activityGroupsByTurn,
  applyCommand,
  commandsFromTranscript,
  commandTokenAt,
  contentBlockText,
  filterCommands,
  isStateOnlyNotice,
  offeredDecisions,
  orderConfigOptions,
  pendingApprovalRowId,
  splitToolTitle,
  statusMeta,
  toolDiffMeta,
  toolKindLabel,
  transcriptItems,
  turnMeta,
} from "./model.js";

function row(id: string, kind: TranscriptRow["kind"], data: unknown = {}): TranscriptRow {
  return { id, kind, data };
}

function tool(id: string): TranscriptRow {
  return row(id, "tool_call", { title: `Read(${id})`, status: "completed" });
}

function text(id: string, kind: "user" | "agent_text" | "agent_thought", body: string): TranscriptRow {
  return row(id, kind, { content: { type: "text", text: body } });
}

const idle: ReducedState = { turn: { responding: false, thinking: false, active_tool_calls: [] } };

describe("row taxonomy", () => {
  it("splits an adapter's Name(argument) title, and falls back to the kind", () => {
    expect(splitToolTitle("Read(src/main.ts)", null, "read")).toEqual({ label: "Read", arg: "src/main.ts" });
    expect(splitToolTitle("something opaque", null, "search")).toEqual({
      label: "Search",
      arg: "something opaque",
    });
    expect(splitToolTitle(undefined, null, undefined)).toEqual({ label: "Tool", arg: "" });
  });

  it("labels an unknown tool kind rather than leaving it blank", () => {
    expect(toolKindLabel("execute")).toBe("Execute");
    expect(toolKindLabel("no_such_kind")).toBe("Tool");
    expect(toolKindLabel(undefined)).toBe("Tool");
  });

  it("names non-text content blocks instead of dropping them", () => {
    expect(contentBlockText({ type: "text", text: "hi" })).toBe("hi");
    expect(contentBlockText({ type: "image" })).toBe("[image]");
    expect(contentBlockText({ type: "resource_link", name: "spec.md" })).toBe("[resource: spec.md]");
    expect(contentBlockText(undefined)).toBe("");
  });

  it("counts a tool call's diff lines", () => {
    expect(toolDiffMeta([{ type: "diff", path: "a.ts", oldText: "one\ntwo\n", newText: "one\nTWO\nthree\n" }]))
      .toBe("+2 −1");
    expect(toolDiffMeta([])).toBe("+0 −0");
  });

  it("shows a status only while it is worth showing", () => {
    expect(statusMeta("in_progress", false)).toEqual({ text: "running", kind: "running" });
    expect(statusMeta("failed", true)).toEqual({ text: "failed", kind: "failed" });
    expect(statusMeta("pending", true)).toBeNull(); // the diff counts already say it
    expect(statusMeta("completed", false)).toBeNull();
  });
});

describe("notices", () => {
  it("reads a maestroTurnMeta footer, and only a well-formed one", () => {
    const meta = { elapsedMs: 4200, outcome: "completed", model: "sonnet" };
    expect(turnMeta(row("n1", "notice", { maestroTurnMeta: meta }))).toEqual(meta);
    expect(turnMeta(row("n2", "notice", { maestroTurnMeta: { outcome: "completed" } }))).toBeNull();
    expect(turnMeta(row("n3", "notice", { sessionUpdate: "session_info_update" }))).toBeNull();
  });

  it("marks the state-only notices the client consumes rather than shows", () => {
    expect(isStateOnlyNotice(row("n1", "notice", { sessionUpdate: "available_commands_update" }))).toBe(true);
    expect(isStateOnlyNotice(row("n2", "notice", { sessionUpdate: "session_info_update" }))).toBe(true);
    expect(isStateOnlyNotice(row("n3", "notice", { sessionUpdate: "something_else" }))).toBe(false);
  });
});

describe("approvals", () => {
  it("offers only decisions the request actually backs", () => {
    expect(
      offeredDecisions([
        { optionId: "a", name: "Allow once", kind: "allow_once" },
        { optionId: "r", name: "Reject", kind: "reject_once" },
      ]),
    ).toEqual(["allow_once", "deny"]);
    expect(offeredDecisions([{ optionId: "a", name: "Always", kind: "allow_always" }])).toEqual([
      "allow_for_session",
    ]);
    expect(offeredDecisions([])).toEqual([]);
  });

  it("points a live pending approval at the newest approval row", () => {
    const rows = [row("approval:1", "approval"), tool("tool:1"), row("approval:2", "approval")];
    const pending: ReducedState = {
      ...idle,
      pending_approval: { nonce: "n", request: {} as never },
    };
    expect(pendingApprovalRowId(rows, pending)).toBe("approval:2");
    expect(pendingApprovalRowId(rows, idle)).toBeNull();
  });
});

describe("activity grouping", () => {
  it("groups a turn's tools once there are two of them", () => {
    const rows = [text("user:1", "user", "go"), tool("tool:1"), tool("tool:2")];
    const groups = activityGroupsByTurn(rows, null, false);
    expect([...groups.keys()]).toEqual(["turn:user:1"]);
    expect(groups.get("turn:user:1")).toMatchObject({ toolCount: 2 });
  });

  it("leaves a single tool call standalone", () => {
    const rows = [text("user:1", "user", "go"), tool("tool:1")];
    expect(activityGroupsByTurn(rows, null, false).size).toBe(0);
  });

  it("absorbs intermediate narration but keeps the final answer outside", () => {
    const rows = [
      text("user:1", "user", "go"),
      tool("tool:1"),
      text("agent:1", "agent_text", "working"),
      tool("tool:2"),
      text("agent:2", "agent_text", "done"),
    ];
    const group = activityGroupsByTurn(rows, null, false).get("turn:user:1")!;
    expect(group.rows.map((r) => r.id)).toEqual(["tool:1", "agent:1", "tool:2"]);
    expect(group.toolCount).toBe(2);
  });

  it("keeps the newest thought outside while the turn is still live", () => {
    const rows = [
      text("user:1", "user", "go"),
      tool("tool:1"),
      tool("tool:2"),
      text("thought:1", "agent_thought", "hmm"),
      text("thought:2", "agent_thought", "aha"),
    ];
    const live = activityGroupsByTurn(rows, null, true).get("turn:user:1")!;
    expect(live.rows.map((r) => r.id)).toEqual(["tool:1", "tool:2", "thought:1"]);
    const ended = activityGroupsByTurn(rows, null, false).get("turn:user:1")!;
    expect(ended.rows.map((r) => r.id)).toEqual(["tool:1", "tool:2", "thought:1", "thought:2"]);
  });

  it("keeps the newest agent_text outside while the turn is still live", () => {
    const rows = [
      text("user:1", "user", "go"),
      tool("tool:1"),
      text("agent:1", "agent_text", "working on it"),
      tool("tool:2"),
      text("agent:2", "agent_text", "almost done"),
    ];
    const live = activityGroupsByTurn(rows, null, true).get("turn:user:1")!;
    // "almost done" stays outside as visible narration while the turn is live
    expect(live.rows.map((r) => r.id)).toEqual(["tool:1", "agent:1", "tool:2"]);
    const ended = activityGroupsByTurn(rows, null, false).get("turn:user:1")!;
    // Once ended, the final agent_text stays outside as the answer
    expect(ended.rows.map((r) => r.id)).toEqual(["tool:1", "agent:1", "tool:2"]);
  });

  it("tracks the last tool's label and argument for the collapsed header", () => {
    const rows = [
      text("user:1", "user", "go"),
      row("tool:1", "tool_call", { title: "Read(src/main.ts)", status: "completed" }),
      row("tool:2", "tool_call", { title: "Execute(git status)", kind: "execute", status: "completed" }),
    ];
    const group = activityGroupsByTurn(rows, null, false).get("turn:user:1")!;
    expect(group.lastToolLabel).toBe("Execute");
    expect(group.lastToolArg).toBe("git status");
  });

  it("absorbs a resolved approval, never the pending one", () => {
    const rows = [
      text("user:1", "user", "go"),
      tool("tool:1"),
      row("approval:1", "approval"),
      tool("tool:2"),
      row("approval:2", "approval"),
      tool("tool:3"),
    ];
    const group = activityGroupsByTurn(rows, "approval:2", false).get("turn:user:1")!;
    expect(group.rows.map((r) => r.id)).toEqual(["tool:1", "approval:1", "tool:2", "tool:3"]);
  });
});

describe("transcript render list", () => {
  it("renders a group once, at its first member's position", () => {
    const rows = [text("user:1", "user", "go"), tool("tool:1"), tool("tool:2"), text("agent:1", "agent_text", "done")];
    const items = transcriptItems(rows, null, false);
    expect(items.map((item) => (item.type === "row" ? item.row.id : item.id))).toEqual([
      "user:1",
      "turn:user:1",
      "agent:1",
    ]);
  });

  it("omits plan rows, state-only notices and standalone resolved approvals", () => {
    const rows = [
      text("user:1", "user", "go"),
      row("plan", "plan", { entries: [] }),
      row("notice:1", "notice", { sessionUpdate: "available_commands_update", availableCommands: [] }),
      row("approval:1", "approval"),
      text("agent:1", "agent_text", "done"),
    ];
    const items = transcriptItems(rows, null, false);
    expect(items.map((item) => (item.type === "row" ? item.row.id : item.id))).toEqual(["user:1", "agent:1"]);
  });

  it("keeps a turn footer only while it is the final item", () => {
    const footer = row("turn_meta:1", "notice", { maestroTurnMeta: { elapsedMs: 10, outcome: "completed" } });
    expect(transcriptItems([text("user:1", "user", "go"), footer], null, false)).toHaveLength(2);
    const later = [text("user:1", "user", "go"), footer, text("user:2", "user", "again")];
    expect(transcriptItems(later, null, false).map((i) => (i.type === "row" ? i.row.id : i.id))).toEqual([
      "user:1",
      "user:2",
    ]);
  });
});

describe("composer commands", () => {
  const notice = row("notice:9", "notice", {
    sessionUpdate: "available_commands_update",
    availableCommands: [
      { name: "compact", description: "Compact  the\n conversation" },
      { name: "cost", description: "Show cost", input: { hint: "[period]" } },
      { name: 42 },
    ],
  });

  it("takes the newest available_commands_update, skipping malformed entries", () => {
    const stale = row("notice:1", "notice", {
      sessionUpdate: "available_commands_update",
      availableCommands: [{ name: "old", description: "gone" }],
    });
    expect(commandsFromTranscript([stale, notice]).map((c) => c.name)).toEqual(["compact", "cost"]);
    expect(commandsFromTranscript([])).toEqual([]);
  });

  it("only matches a /token under the caret", () => {
    expect(commandTokenAt("/comp", 5, 5)).toEqual({ start: 0, end: 5, query: "comp" });
    expect(commandTokenAt("hello /co there", 9, 9)).toEqual({ start: 6, end: 9, query: "co" });
    expect(commandTokenAt("no slash", 3, 3)).toBeNull();
    expect(commandTokenAt("/comp", 2, 5)).toBeNull(); // a selection is not a caret
  });

  it("ranks prefix matches ahead of substring matches", () => {
    const commands = commandsFromTranscript([notice]);
    expect(filterCommands(commands, "co").map((c) => c.name)).toEqual(["compact", "cost"]);
    expect(filterCommands(commands, "act").map((c) => c.name)).toEqual(["compact"]);
  });

  it("replaces only the token under the caret", () => {
    const token = commandTokenAt("say /co now", 7, 7)!;
    expect(applyCommand("say /co now", token, "compact")).toEqual({ value: "say /compact now", cursor: 13 });
    const trailing = commandTokenAt("/co", 3, 3)!;
    expect(applyCommand("/co", trailing, "compact")).toEqual({ value: "/compact ", cursor: 9 });
  });
});

describe("session config", () => {
  it("orders the menu by category, unknown categories last", () => {
    const options = [
      { id: "d", category: null },
      { id: "b", category: "thought_level" },
      { id: "a", category: "model" },
      { id: "c", category: "mode" },
    ];
    expect(orderConfigOptions(options).map((o) => o.id)).toEqual(["a", "b", "c", "d"]);
  });
});