import assert from "node:assert/strict";
import test from "node:test";

import {
  clearPasteResidualAfterTerminalWrite,
  markExpectedTerminalCursorPositionReport,
  pasteTextIntoTerminal,
  prepareTerminalDataForUserPasteDisplay,
  shouldBroadcastTerminalUserInput,
  shouldSuppressTerminalBroadcastForUserPaste,
  shouldSuppressTerminalInputScrollForUserPaste,
} from "./terminalUserPaste";

test("user paste delegates raw clipboard text to xterm paste handling", () => {
  const pasted: string[] = [];
  const term = {
    paste: (text: string) => pasted.push(text),
    scrollToBottom: () => {
      throw new Error("scrollToBottom should not run when scrollOnPaste is false");
    },
  };

  const text = "line one\r\nline two\nline three";

  pasteTextIntoTerminal(term, text, { scrollOnPaste: false });

  assert.deepEqual(pasted, [text]);
});

test("user paste reports prepared terminal input for broadcast targets", () => {
  const pasted: string[] = [];
  const broadcastData: string[] = [];
  const term = {
    paste: (text: string) => pasted.push(text),
    scrollToBottom: () => {},
  };

  const text = "line one\r\nline two\nline three";

  const options = {
    scrollOnPaste: false,
    onPasteData: (data: string) => broadcastData.push(data),
  };

  pasteTextIntoTerminal(term, text, options);

  assert.deepEqual(pasted, [text]);
  assert.deepEqual(broadcastData, ["line one\rline two\rline three"]);
});

test("user paste reports bracketed terminal input for broadcast targets when bracketed paste is active", () => {
  const broadcastData: string[] = [];
  const term = {
    modes: { bracketedPasteMode: true },
    options: { ignoreBracketedPasteMode: false },
    paste: () => {},
    scrollToBottom: () => {},
  };

  pasteTextIntoTerminal(term, "line one\nline two", {
    scrollOnPaste: false,
    onPasteData: (data: string) => broadcastData.push(data),
  });

  assert.deepEqual(broadcastData, ["\x1b[200~line one\rline two\x1b[201~"]);
});

test("user paste reports plain terminal input for broadcast targets when bracketed paste is ignored", () => {
  const broadcastData: string[] = [];
  const term = {
    modes: { bracketedPasteMode: true },
    options: { ignoreBracketedPasteMode: true },
    paste: () => {},
    scrollToBottom: () => {},
  };

  pasteTextIntoTerminal(term, "line one\nline two", {
    scrollOnPaste: false,
    onPasteData: (data: string) => broadcastData.push(data),
  });

  assert.deepEqual(broadcastData, ["line one\rline two"]);
});

test("user paste broadcast data is consumed so xterm onData does not rebroadcast it", () => {
  const term = {
    modes: { bracketedPasteMode: true },
    options: { ignoreBracketedPasteMode: false },
    paste: () => {},
    scrollToBottom: () => {},
  };

  pasteTextIntoTerminal(term, "line one\nline two", {
    scrollOnPaste: false,
    onPasteData: () => true,
  });

  assert.equal(
    shouldSuppressTerminalBroadcastForUserPaste(
      term,
      "\x1b[200~line one\rline two\x1b[201~",
    ),
    true,
  );
  assert.equal(
    shouldSuppressTerminalBroadcastForUserPaste(
      term,
      "\x1b[200~line one\rline two\x1b[201~",
    ),
    false,
  );
});

test("user paste does not suppress later broadcast when paste callback did not broadcast", () => {
  const term = {
    paste: () => {},
    scrollToBottom: () => {},
  };

  pasteTextIntoTerminal(term, "line one", {
    scrollOnPaste: false,
    onPasteData: () => false,
  });

  assert.equal(shouldSuppressTerminalBroadcastForUserPaste(term, "line one"), false);
});

test("broadcast gate consumes paste state even when broadcast is disabled before onData", () => {
  const term = {
    paste: () => {},
    scrollToBottom: () => {},
  };

  pasteTextIntoTerminal(term, "line one", {
    scrollOnPaste: false,
    onPasteData: () => true,
  });

  assert.equal(
    shouldBroadcastTerminalUserInput(term, "line one", {
      isBroadcastEnabled: false,
      hasBroadcastInputHandler: true,
    }),
    false,
  );
  assert.equal(
    shouldBroadcastTerminalUserInput(term, "line one", {
      isBroadcastEnabled: true,
      hasBroadcastInputHandler: true,
    }),
    true,
  );
});

test("broadcast gate suppresses expected terminal cursor position report replies", () => {
  const term = {};

  markExpectedTerminalCursorPositionReport(term);

  assert.equal(
    shouldBroadcastTerminalUserInput(term, "\x1b[1;1R", {
      isBroadcastEnabled: true,
      hasBroadcastInputHandler: true,
    }),
    false,
  );
  assert.equal(
    shouldBroadcastTerminalUserInput(term, "\x1b[1;1R", {
      isBroadcastEnabled: true,
      hasBroadcastInputHandler: true,
    }),
    true,
  );
});

test("broadcast gate suppresses cursor position report replies split across chunks", () => {
  const term = {};

  markExpectedTerminalCursorPositionReport(term);

  assert.equal(
    shouldBroadcastTerminalUserInput(term, "\x1b[", {
      isBroadcastEnabled: true,
      hasBroadcastInputHandler: true,
    }),
    false,
  );
  assert.equal(
    shouldBroadcastTerminalUserInput(term, "24;", {
      isBroadcastEnabled: true,
      hasBroadcastInputHandler: true,
    }),
    false,
  );
  assert.equal(
    shouldBroadcastTerminalUserInput(term, "80R", {
      isBroadcastEnabled: true,
      hasBroadcastInputHandler: true,
    }),
    false,
  );
  assert.equal(
    shouldBroadcastTerminalUserInput(term, "\x1b[24;80R", {
      isBroadcastEnabled: true,
      hasBroadcastInputHandler: true,
    }),
    true,
  );
});

test("broadcast gate preserves normal input while a cursor position report is pending", () => {
  const term = {};

  markExpectedTerminalCursorPositionReport(term);

  assert.equal(
    shouldBroadcastTerminalUserInput(term, "ls\r", {
      isBroadcastEnabled: true,
      hasBroadcastInputHandler: true,
    }),
    true,
  );
  assert.equal(
    shouldBroadcastTerminalUserInput(term, "\x1b[24;80R", {
      isBroadcastEnabled: true,
      hasBroadcastInputHandler: true,
    }),
    false,
  );
});

test("broadcast gate preserves keyboard sequences that look like cursor reports without a terminal request", () => {
  const term = {};

  assert.equal(
    shouldBroadcastTerminalUserInput(term, "\x1b[1;2R", {
      isBroadcastEnabled: true,
      hasBroadcastInputHandler: true,
    }),
    true,
  );
});

test("user paste preserves the existing scroll-on-paste behavior", () => {
  const calls: string[] = [];
  const term = {
    paste: () => calls.push("paste"),
    scrollToBottom: () => calls.push("scroll"),
  };

  pasteTextIntoTerminal(term, "echo ok", {
    scrollOnPaste: true,
    requestAnimationFrame: (callback) => {
      calls.push("raf");
      callback();
    },
  });

  assert.deepEqual(calls, ["paste", "scroll", "raf", "scroll"]);
});

test("user paste with scroll disabled suppresses input auto-scroll for raw paste data", () => {
  const term = {
    paste: () => {},
    scrollToBottom: () => {},
  };

  pasteTextIntoTerminal(term, "line one\nline two", {
    scrollOnPaste: false,
  });

  assert.equal(shouldSuppressTerminalInputScrollForUserPaste(term, "line one\rline two"), true);
  assert.equal(shouldSuppressTerminalInputScrollForUserPaste(term, "x"), false);
});

test("user paste with scroll disabled suppresses input auto-scroll for bracketed paste data", () => {
  const term = {
    paste: () => {},
    scrollToBottom: () => {},
  };

  pasteTextIntoTerminal(term, "line one\nline two", {
    scrollOnPaste: false,
  });

  assert.equal(
    shouldSuppressTerminalInputScrollForUserPaste(term, "\x1b[200~line one\rline two\x1b[201~"),
    true,
  );
});

test("user paste with scroll enabled keeps input auto-scroll available", () => {
  const term = {
    paste: () => {},
    scrollToBottom: () => {},
  };

  pasteTextIntoTerminal(term, "line one\nline two", {
    scrollOnPaste: true,
    requestAnimationFrame: () => {},
  });

  assert.equal(shouldSuppressTerminalInputScrollForUserPaste(term, "line one\rline two"), false);
});

test("user paste with scroll disabled suppresses split input chunks", () => {
  const term = {
    paste: () => {},
    scrollToBottom: () => {},
  };

  pasteTextIntoTerminal(term, "line one\nline two", {
    scrollOnPaste: false,
  });

  assert.equal(shouldSuppressTerminalInputScrollForUserPaste(term, "line one\r"), true);
  assert.equal(shouldSuppressTerminalInputScrollForUserPaste(term, "line two"), true);
  assert.equal(shouldSuppressTerminalInputScrollForUserPaste(term, "line two"), false);
});

test("long multi-line paste strips readline active-region highlighting from echo", () => {
  const term = {
    cols: 20,
    rows: 4,
    paste: () => {},
    scrollToBottom: () => {},
    write: () => {},
  };

  const longPaste = Array.from({ length: 20 }, (_, index) => `line ${index} with enough content`).join("\n");
  pasteTextIntoTerminal(term, longPaste, {
    scrollOnPaste: false,
  });

  assert.equal(
    prepareTerminalDataForUserPasteDisplay(term, "\x1b[7mline 3 with enough content\x1b[27m"),
    "line 3 with enough content",
  );
});

test("long multi-line paste preserves unrelated reverse-video output", () => {
  const term = {
    cols: 20,
    rows: 4,
    paste: () => {},
    scrollToBottom: () => {},
    write: () => {},
  };

  const longPaste = Array.from({ length: 20 }, (_, index) => `line ${index} with enough content`).join("\n");
  pasteTextIntoTerminal(term, longPaste, {
    scrollOnPaste: false,
  });

  assert.equal(
    prepareTerminalDataForUserPasteDisplay(term, "\x1b[7munrelated ncurses status\x1b[27m"),
    "\x1b[7munrelated ncurses status\x1b[27m",
  );
});

test("long multi-line paste strips only matched paste echo segments in mixed output", () => {
  const term = {
    cols: 20,
    rows: 4,
    paste: () => {},
    scrollToBottom: () => {},
    write: () => {},
  };

  const longPaste = Array.from({ length: 20 }, (_, index) => `line ${index} with enough content`).join("\n");
  pasteTextIntoTerminal(term, longPaste, {
    scrollOnPaste: false,
  });

  assert.equal(
    prepareTerminalDataForUserPasteDisplay(
      term,
      "mode \x1b[7mINSERT\x1b[27m \x1b[7mline 3 with enough content\x1b[27m done",
    ),
    "mode \x1b[7mINSERT\x1b[27m line 3 with enough content done",
  );
});

test("long multi-line paste strips matched paste echo when active-region spans chunks", () => {
  const term = {
    cols: 20,
    rows: 4,
    paste: () => {},
    scrollToBottom: () => {},
    write: () => {},
  };

  const longPaste = Array.from({ length: 20 }, (_, index) => `line ${index} with enough content`).join("\n");
  pasteTextIntoTerminal(term, longPaste, {
    scrollOnPaste: false,
  });

  assert.equal(
    prepareTerminalDataForUserPasteDisplay(term, "\x1b[7mline 3 with enough"),
    "line 3 with enough",
  );
  assert.equal(
    prepareTerminalDataForUserPasteDisplay(term, " content\x1b[27m"),
    " content",
  );
});

test("long multi-line paste does not clear cursor-right residue before terminal echo", () => {
  const writes: string[] = [];
  const term = {
    cols: 20,
    rows: 4,
    paste: () => {},
    scrollToBottom: () => {},
    write: (data: string) => writes.push(data),
  };

  const longPaste = Array.from({ length: 20 }, (_, index) => `line ${index} with enough content`).join("\n");
  pasteTextIntoTerminal(term, longPaste, {
    scrollOnPaste: false,
  });

  clearPasteResidualAfterTerminalWrite(term);

  assert.deepEqual(writes, []);
});

test("long multi-line paste clears cursor-right residue after terminal echo", () => {
  const writes: string[] = [];
  const term = {
    cols: 20,
    rows: 4,
    paste: () => {},
    scrollToBottom: () => {},
    write: (data: string) => writes.push(data),
  };

  const longPaste = Array.from({ length: 20 }, (_, index) => `line ${index} with enough content`).join("\n");
  pasteTextIntoTerminal(term, longPaste, {
    scrollOnPaste: false,
  });
  prepareTerminalDataForUserPasteDisplay(term, "\x1b[7mline 3 with enough content\x1b[27m");

  clearPasteResidualAfterTerminalWrite(term);

  assert.deepEqual(writes, ["\x1b[K"]);
});