/**
 * Tests for terminal image detection and line handling
 */

import assert from "node:assert";
import { describe, it } from "node:test";
import { detectCapabilities, hyperlink, isImageLine } from "../src/terminal-image.js";

const ENV_KEYS = [
	"TERM",
	"TERM_PROGRAM",
	"COLORTERM",
	"TMUX",
	"KITTY_WINDOW_ID",
	"GHOSTTY_RESOURCES_DIR",
	"WEZTERM_PANE",
	"ITERM_SESSION_ID",
] as const;

function withEnv(overrides: Record<string, string | undefined>, fn: () => void): void {
	const saved: Record<string, string | undefined> = {};
	for (const key of ENV_KEYS) {
		saved[key] = process.env[key];
		delete process.env[key];
	}
	try {
		for (const [k, v] of Object.entries(overrides)) {
			if (v === undefined) delete process.env[k];
			else process.env[k] = v;
		}
		fn();
	} finally {
		for (const key of ENV_KEYS) {
			if (saved[key] === undefined) delete process.env[key];
			else process.env[key] = saved[key];
		}
	}
}

describe("isImageLine", () => {
	describe("iTerm2 image protocol", () => {
		it("should detect iTerm2 image escape sequence at start of line", () => {
			// iTerm2 image escape sequence: ESC ]1337;File=...
			const iterm2ImageLine = "\x1b]1337;File=size=100,100;inline=1:base64encodeddata==\x07";
			assert.strictEqual(isImageLine(iterm2ImageLine), true);
		});

		it("should detect iTerm2 image escape sequence with text before it", () => {
			// Simulating a line that has text then image data (bug scenario)
			const lineWithTextAndImage = "Some text \x1b]1337;File=size=100,100;inline=1:base64data==\x07 more text";
			assert.strictEqual(isImageLine(lineWithTextAndImage), true);
		});

		it("should detect iTerm2 image escape sequence in middle of long line", () => {
			// Simulate a very long line with image data in the middle
			const longLineWithImage =
				"Text before image..." + "\x1b]1337;File=inline=1:verylongbase64data==" + "...text after";
			assert.strictEqual(isImageLine(longLineWithImage), true);
		});

		it("should detect iTerm2 image escape sequence at end of line", () => {
			const lineWithImageAtEnd = "Regular text ending with \x1b]1337;File=inline=1:base64data==\x07";
			assert.strictEqual(isImageLine(lineWithImageAtEnd), true);
		});

		it("should detect minimal iTerm2 image escape sequence", () => {
			const minimalImageLine = "\x1b]1337;File=:\x07";
			assert.strictEqual(isImageLine(minimalImageLine), true);
		});
	});

	describe("Kitty image protocol", () => {
		it("should detect Kitty image escape sequence at start of line", () => {
			// Kitty image escape sequence: ESC _G
			const kittyImageLine = "\x1b_Ga=T,f=100,t=f,d=base64data...\x1b\\\x1b_Gm=i=1;\x1b\\";
			assert.strictEqual(isImageLine(kittyImageLine), true);
		});

		it("should detect Kitty image escape sequence with text before it", () => {
			// Bug scenario: text + image data in same line
			const lineWithTextAndKittyImage = "Output: \x1b_Ga=T,f=100;data...\x1b\\\x1b_Gm=i=1;\x1b\\";
			assert.strictEqual(isImageLine(lineWithTextAndKittyImage), true);
		});

		it("should detect Kitty image escape sequence with padding", () => {
			// Kitty protocol adds padding to escape sequences
			const kittyWithPadding = "  \x1b_Ga=T,f=100...\x1b\\\x1b_Gm=i=1;\x1b\\  ";
			assert.strictEqual(isImageLine(kittyWithPadding), true);
		});
	});

	describe("Bug regression tests", () => {
		it("should detect image sequences in very long lines (304k+ chars)", () => {
			// This simulates the crash scenario: a line with 304,401 chars
			// containing image escape sequences somewhere
			const base64Char = "A".repeat(100); // 100 chars of base64-like data
			const imageSequence = "\x1b]1337;File=size=800,600;inline=1:";

			// Build a long line with image sequence
			const longLine =
				"Text prefix " +
				imageSequence +
				base64Char.repeat(3000) + // ~300,000 chars
				" suffix";

			assert.strictEqual(longLine.length > 300000, true);
			assert.strictEqual(isImageLine(longLine), true);
		});

		it("should detect image sequences when terminal doesn't support images", () => {
			// The bug occurred when getImageEscapePrefix() returned null
			// isImageLine should still detect image sequences regardless
			const lineWithImage = "Read image file [image/jpeg]\x1b]1337;File=inline=1:base64data==\x07";
			assert.strictEqual(isImageLine(lineWithImage), true);
		});

		it("should detect image sequences with ANSI codes before them", () => {
			// Text might have ANSI styling before image data
			const lineWithAnsiAndImage = "\x1b[31mError output \x1b]1337;File=inline=1:image==\x07";
			assert.strictEqual(isImageLine(lineWithAnsiAndImage), true);
		});

		it("should detect image sequences with ANSI codes after them", () => {
			const lineWithImageAndAnsi = "\x1b_Ga=T,f=100:data...\x1b\\\x1b_Gm=i=1;\x1b\\\x1b[0m reset";
			assert.strictEqual(isImageLine(lineWithImageAndAnsi), true);
		});
	});

	describe("Negative cases - lines without images", () => {
		it("should not detect images in plain text lines", () => {
			const plainText = "This is just a regular text line without any escape sequences";
			assert.strictEqual(isImageLine(plainText), false);
		});

		it("should not detect images in lines with only ANSI codes", () => {
			const ansiText = "\x1b[31mRed text\x1b[0m and \x1b[32mgreen text\x1b[0m";
			assert.strictEqual(isImageLine(ansiText), false);
		});

		it("should not detect images in lines with cursor movement codes", () => {
			const cursorCodes = "\x1b[1A\x1b[2KLine cleared and moved up";
			assert.strictEqual(isImageLine(cursorCodes), false);
		});

		it("should not detect images in lines with partial iTerm2 sequences", () => {
			// Similar prefix but missing the complete sequence
			const partialSequence = "Some text with ]1337;File but missing ESC at start";
			assert.strictEqual(isImageLine(partialSequence), false);
		});

		it("should not detect images in lines with partial Kitty sequences", () => {
			// Similar prefix but missing the complete sequence
			const partialSequence = "Some text with _G but missing ESC at start";
			assert.strictEqual(isImageLine(partialSequence), false);
		});

		it("should not detect images in empty lines", () => {
			assert.strictEqual(isImageLine(""), false);
		});

		it("should not detect images in lines with newlines only", () => {
			assert.strictEqual(isImageLine("\n"), false);
			assert.strictEqual(isImageLine("\n\n"), false);
		});
	});

	describe("Mixed content scenarios", () => {
		it("should detect images when line has both Kitty and iTerm2 sequences", () => {
			const mixedLine = "Kitty: \x1b_Ga=T...\x1b\\\x1b_Gm=i=1;\x1b\\ iTerm2: \x1b]1337;File=inline=1:data==\x07";
			assert.strictEqual(isImageLine(mixedLine), true);
		});

		it("should detect image in line with multiple text and image segments", () => {
			const complexLine = "Start \x1b]1337;File=img1==\x07 middle \x1b]1337;File=img2==\x07 end";
			assert.strictEqual(isImageLine(complexLine), true);
		});

		it("should not falsely detect image in line with file path containing keywords", () => {
			// File path might contain "1337" or "File" but without escape sequences
			const filePathLine = "/path/to/File_1337_backup/image.jpg";
			assert.strictEqual(isImageLine(filePathLine), false);
		});
	});
});

describe("detectCapabilities", () => {
	it("defaults to hyperlinks: false for unknown terminals", () => {
		withEnv({}, () => {
			const caps = detectCapabilities();
			assert.strictEqual(caps.hyperlinks, false);
			assert.strictEqual(caps.images, null);
		});
	});

	it("forces hyperlinks: false under tmux even if outer terminal supports OSC 8", () => {
		withEnv({ TMUX: "/tmp/tmux-1000/default,1234,0", TERM_PROGRAM: "ghostty" }, () => {
			const caps = detectCapabilities();
			assert.strictEqual(caps.hyperlinks, false);
			assert.strictEqual(caps.images, null);
		});
	});

	it("forces hyperlinks: false when TERM starts with 'tmux'", () => {
		withEnv({ TERM: "tmux-256color", TERM_PROGRAM: "iterm.app" }, () => {
			const caps = detectCapabilities();
			assert.strictEqual(caps.hyperlinks, false);
			assert.strictEqual(caps.images, null);
		});
	});

	it("forces hyperlinks: false when TERM starts with 'screen'", () => {
		withEnv({ TERM: "screen-256color" }, () => {
			const caps = detectCapabilities();
			assert.strictEqual(caps.hyperlinks, false);
			assert.strictEqual(caps.images, null);
		});
	});

	it("enables hyperlinks for Ghostty", () => {
		withEnv({ TERM_PROGRAM: "ghostty" }, () => {
			const caps = detectCapabilities();
			assert.strictEqual(caps.hyperlinks, true);
		});
	});

	it("enables hyperlinks for Kitty", () => {
		withEnv({ KITTY_WINDOW_ID: "1" }, () => {
			const caps = detectCapabilities();
			assert.strictEqual(caps.hyperlinks, true);
		});
	});

	it("enables hyperlinks for WezTerm", () => {
		withEnv({ WEZTERM_PANE: "0" }, () => {
			const caps = detectCapabilities();
			assert.strictEqual(caps.hyperlinks, true);
		});
	});

	it("enables hyperlinks for iTerm2", () => {
		withEnv({ TERM_PROGRAM: "iterm.app" }, () => {
			const caps = detectCapabilities();
			assert.strictEqual(caps.hyperlinks, true);
		});
	});

	it("enables hyperlinks for VSCode", () => {
		withEnv({ TERM_PROGRAM: "vscode" }, () => {
			const caps = detectCapabilities();
			assert.strictEqual(caps.hyperlinks, true);
		});
	});
});

describe("hyperlink", () => {
	it("wraps text in OSC 8 open and close sequences", () => {
		const result = hyperlink("click me", "https://example.com");
		assert.strictEqual(result, "\x1b]8;;https://example.com\x1b\\click me\x1b]8;;\x1b\\");
	});

	it("preserves ANSI styling inside the hyperlink", () => {
		const styled = "\x1b[4m\x1b[34mclick me\x1b[0m";
		const result = hyperlink(styled, "https://example.com");
		assert.ok(result.startsWith("\x1b]8;;https://example.com\x1b\\"));
		assert.ok(result.includes(styled));
		assert.ok(result.endsWith("\x1b]8;;\x1b\\"));
	});

	it("works with empty text", () => {
		const result = hyperlink("", "https://example.com");
		assert.strictEqual(result, "\x1b]8;;https://example.com\x1b\\\x1b]8;;\x1b\\");
	});

	it("works with file:// URIs", () => {
		const result = hyperlink("README.md", "file:///home/user/README.md");
		assert.ok(result.includes("file:///home/user/README.md"));
		assert.ok(result.includes("README.md"));
	});
});