import XCTest
import Foundation
import ForgeColor
import ForgeGrade
@testable import ForgeProxy

final class FFmpegCommandTests: XCTestCase {

    // ProRes proxy preset argv golden.
    func testProResProxyArgs() {
        let cmd = FFmpegCommandBuilder.build(
            input: "/media/A001C001.mov",
            output: "/proxies/A001C001.mov",
            preset: .proresProxy,
            scale: .half,
            lutPath: nil,
            burnIn: nil)
        XCTAssertEqual(cmd.first, "-y")
        XCTAssertTrue(cmd.contains("-i"))
        XCTAssertTrue(cmd.contains("/media/A001C001.mov"))
        XCTAssertTrue(cmd.contains("prores_ks"))
        // Profile 0 = proxy.
        let profileIdx = cmd.firstIndex(of: "-profile:v")!
        XCTAssertEqual(cmd[profileIdx + 1], "0")
        XCTAssertTrue(cmd.contains("scale=iw/2:ih/2"))
        XCTAssertEqual(cmd.last, "/proxies/A001C001.mov")
    }

    // H264 preset.
    func testH264Args() {
        let cmd = FFmpegCommandBuilder.build(
            input: "in.mov", output: "out.mp4",
            preset: .h264, scale: .quarter, lutPath: nil, burnIn: nil)
        XCTAssertTrue(cmd.contains("libx264"))
        XCTAssertTrue(cmd.contains("scale=iw/4:ih/4"))
    }

    // DNxHR preset.
    func testDNxHRArgs() {
        let cmd = FFmpegCommandBuilder.build(
            input: "in.mov", output: "out.mxf",
            preset: .dnxhrLB, scale: .full, lutPath: nil, burnIn: nil)
        XCTAssertTrue(cmd.contains("dnxhd"))
        XCTAssertTrue(cmd.contains("dnxhr_lb"))
        // Full scale: no scale filter unless LUT/burn present.
        XCTAssertFalse(cmd.joined(separator: " ").contains("scale="))
    }

    // LUT filter: lut3d with escaped path joins filter chain before scale.
    func testLutFilter() {
        let cmd = FFmpegCommandBuilder.build(
            input: "in.mov", output: "out.mov",
            preset: .proresProxy, scale: .half,
            lutPath: "/tmp/my look's.cube", burnIn: nil)
        let vf = cmd[cmd.firstIndex(of: "-vf")! + 1]
        XCTAssertTrue(vf.contains("lut3d="))
        // ffmpeg filter escaping: ' -> '\'' inside quoted value, or backslash escapes.
        XCTAssertTrue(vf.contains("my look"))
        XCTAssertTrue(vf.contains("lut3d="), "lut3d must precede scale")
        XCTAssertLessThan(vf.range(of: "lut3d=")!.lowerBound, vf.range(of: "scale=")!.lowerBound)
    }

    // Burn-in: drawtext with clip name + timecode.
    func testBurnIn() {
        let cmd = FFmpegCommandBuilder.build(
            input: "in.mov", output: "out.mov",
            preset: .h264, scale: .half,
            lutPath: nil,
            burnIn: BurnIn(clipName: "A001C001", timecode: "10:00:00:00", fps: 24))
        let vf = cmd[cmd.firstIndex(of: "-vf")! + 1]
        XCTAssertTrue(vf.contains("drawtext"))
        XCTAssertTrue(vf.contains("A001C001"))
        XCTAssertTrue(vf.contains("timecode"))
        // TC colons escaped for filter syntax.
        XCTAssertTrue(vf.contains("10\\:00\\:00\\:00"))
    }

    // Audio: copy through.
    func testAudioCopied() {
        let cmd = FFmpegCommandBuilder.build(
            input: "in.mov", output: "out.mov",
            preset: .proresProxy, scale: .full, lutPath: nil, burnIn: nil)
        let aIdx = cmd.firstIndex(of: "-c:a")!
        XCTAssertEqual(cmd[aIdx + 1], "copy")
    }
}

final class ProxyJobTests: XCTestCase {

    // Runner invokes executable with built argv; fake ffmpeg script records args.
    func testRunnerInvokesWithArgs() async throws {
        let dir = NSTemporaryDirectory() + "forge-proxy-\(UUID().uuidString)"
        try FileManager.default.createDirectory(atPath: dir, withIntermediateDirectories: true)
        defer { try? FileManager.default.removeItem(atPath: dir) }

        let fake = dir + "/fake-ffmpeg"
        try #"""
        #!/bin/bash
        echo "$@" > "$(dirname "$0")/argv.txt"
        exit 0
        """#.write(toFile: fake, atomically: true, encoding: .utf8)
        try FileManager.default.setAttributes([.posixPermissions: 0o755], ofItemAtPath: fake)

        let runner = ProxyRunner(ffmpegPath: fake)
        try await runner.run(args: ["-y", "-i", "in.mov", "out.mov"])

        let argv = try String(contentsOfFile: dir + "/argv.txt", encoding: .utf8)
        XCTAssertEqual(argv.trimmingCharacters(in: .whitespacesAndNewlines), "-y -i in.mov out.mov")
    }

    // Nonzero exit throws with stderr.
    func testRunnerThrowsOnFailure() async throws {
        let dir = NSTemporaryDirectory() + "forge-proxy-\(UUID().uuidString)"
        try FileManager.default.createDirectory(atPath: dir, withIntermediateDirectories: true)
        defer { try? FileManager.default.removeItem(atPath: dir) }
        let fake = dir + "/fake-ffmpeg"
        try "#!/bin/bash\necho 'boom' >&2\nexit 1\n".write(toFile: fake, atomically: true, encoding: .utf8)
        try FileManager.default.setAttributes([.posixPermissions: 0o755], ofItemAtPath: fake)

        let runner = ProxyRunner(ffmpegPath: fake)
        do {
            try await runner.run(args: ["x"])
            XCTFail("expected throw")
        } catch let e as ProxyError {
            guard case .ffmpegFailed(_, let stderr) = e else { return XCTFail("wrong error") }
            XCTAssertTrue(stderr.contains("boom"))
        }
    }

    // Graded job: snapshot -> temp .cube written -> lut3d arg references it -> cleaned up after.
    func testGradedJobWritesCube() async throws {
        let dir = NSTemporaryDirectory() + "forge-proxy-\(UUID().uuidString)"
        try FileManager.default.createDirectory(atPath: dir, withIntermediateDirectories: true)
        defer { try? FileManager.default.removeItem(atPath: dir) }
        let fake = dir + "/fake-ffmpeg"
        try #"""
        #!/bin/bash
        echo "$@" > "$(dirname "$0")/argv.txt"
        # capture cube existence at run time
        if [[ "$@" == *lut3d* ]]; then
          cube=$(echo "$@" | grep -oE "[^ =']*\.cube" | head -1)
          [[ -f "$cube" ]] && echo "cube-exists" > "$(dirname "$0")/cube.txt"
        fi
        exit 0
        """#.write(toFile: fake, atomically: true, encoding: .utf8)
        try FileManager.default.setAttributes([.posixPermissions: 0o755], ofItemAtPath: fake)

        let stack = GradeStack(nodes: [GradeNode(kind: .cdl(CDL(
            slope: SIMD3(1.2, 1, 1), offset: .zero, power: .one, saturation: 1)))])
        let snapshot = try GradeSnapshot.encode(stack)

        let job = ProxyJob(
            input: "in.mov",
            output: dir + "/out.mov",
            preset: .proresProxy,
            scale: .half,
            gradeSnapshot: snapshot,
            burnIn: nil)
        try await job.run(ffmpegPath: fake, latticeSize: 9)

        let argv = try String(contentsOfFile: dir + "/argv.txt", encoding: .utf8)
        XCTAssertTrue(argv.contains("lut3d="))
        XCTAssertEqual(try String(contentsOfFile: dir + "/cube.txt", encoding: .utf8).trimmingCharacters(in: .whitespacesAndNewlines), "cube-exists")
    }

    // Ungraded fallback: no snapshot -> no lut3d in args.
    func testUngradedNoLut() async throws {
        let dir = NSTemporaryDirectory() + "forge-proxy-\(UUID().uuidString)"
        try FileManager.default.createDirectory(atPath: dir, withIntermediateDirectories: true)
        defer { try? FileManager.default.removeItem(atPath: dir) }
        let fake = dir + "/fake-ffmpeg"
        try "#!/bin/bash\necho \"$@\" > \"$(dirname \"$0\")/argv.txt\"\nexit 0\n".write(toFile: fake, atomically: true, encoding: .utf8)
        try FileManager.default.setAttributes([.posixPermissions: 0o755], ofItemAtPath: fake)

        let job = ProxyJob(input: "in.mov", output: dir + "/out.mov", preset: .h264, scale: .half, gradeSnapshot: nil, burnIn: nil)
        try await job.run(ffmpegPath: fake, latticeSize: 9)
        let argv = try String(contentsOfFile: dir + "/argv.txt", encoding: .utf8)
        XCTAssertFalse(argv.contains("lut3d"))
    }
}