import AppKit
import Testing
@testable import Conjure

@Test @MainActor
func missingColorConfigurationUsesSunsetWithoutReadingGeneratedTheme() throws {
    let directory = try colorConfigurationDirectory()
    defer { try? FileManager.default.removeItem(at: directory) }
    try Data("not JSON".utf8).write(to: directory.appendingPathComponent("theme.json"))

    let loaded = try ColorScheme.load(from: directory)
    expectSameColors(loaded, ColorScheme.sunset)

    try Data("{}".utf8).write(to: directory.appendingPathComponent("config.json"))
    expectSameColors(try ColorScheme.load(from: directory), ColorScheme.sunset)

    try Data(#"{"theme":"sunset"}"#.utf8).write(to: directory.appendingPathComponent("config.json"))
    expectSameColors(try ColorScheme.load(from: directory), ColorScheme.sunset)
}

@Test @MainActor
func partialManualColorsOverrideSunsetWithoutChangingOtherFields() throws {
    let directory = try colorConfigurationDirectory()
    defer { try? FileManager.default.removeItem(at: directory) }
    try Data(##"{"colors":{"accent":"#aB1234","error":"#123456"}}"##.utf8)
        .write(to: directory.appendingPathComponent("config.json"))

    var expected = ColorScheme.sunset
    expected.accent = NSColor(srgbRed: 171.0 / 255, green: 18.0 / 255, blue: 52.0 / 255, alpha: 1)
    expected.error = NSColor(srgbRed: 18.0 / 255, green: 52.0 / 255, blue: 86.0 / 255, alpha: 1)
    expectSameColors(try ColorScheme.load(from: directory), expected)
}

@Test @MainActor
func tintColorsLayerBetweenDefaultsAndManualOverrides() throws {
    let directory = try colorConfigurationDirectory()
    defer { try? FileManager.default.removeItem(at: directory) }
    try Data(##"{"theme":"tint","colors":{"accent":"#ffffff","text":"#000000"}}"##.utf8)
        .write(to: directory.appendingPathComponent("config.json"))
    try Data(##"{"colors":{"accent":"#ff0000","background":"#123456","glow":"#00ff00"}}"##.utf8)
        .write(to: directory.appendingPathComponent("theme.json"))

    var expected = ColorScheme.sunset
    expected.accent = NSColor(srgbRed: 1, green: 1, blue: 1, alpha: 1)
    expected.text = NSColor(srgbRed: 0, green: 0, blue: 0, alpha: 1)
    expected.background = NSColor(srgbRed: 18.0 / 255, green: 52.0 / 255, blue: 86.0 / 255, alpha: 1)
    expected.glow = NSColor(srgbRed: 0, green: 1, blue: 0, alpha: 1)
    expectSameColors(try ColorScheme.load(from: directory), expected)
}

@Test @MainActor
func malformedColorConfigurationReportsItsPathAndReason() throws {
    let directory = try colorConfigurationDirectory()
    defer { try? FileManager.default.removeItem(at: directory) }
    let config = directory.appendingPathComponent("config.json")
    let invalid: [(String, String)] = [
        (##"{"colors":{"accent":"#12345678"}}"##, "colors.accent"),
        (##"{"colors":{"accent":"#fff"}}"##, "colors.accent"),
        (##"{"colors":{"accent":"#12gg56"}}"##, "colors.accent"),
        (##"{"colors":{"accent":"#１２３４５６"}}"##, "colors.accent"),
        (#"{"colors":{"accent":"123456"}}"#, "colors.accent"),
        (#"{"colors":{"accent":" #123456"}}"#, "colors.accent"),
        (#"{"colors":{"accent":42}}"#, "colors.accent"),
        (#"{"colors":{"accent":null}}"#, "colors.accent"),
        (##"{"colors":{"accnet":"#123456"}}"##, "colors.accnet"),
        (#"{"opacity":0.5}"#, "opacity"),
        (#"{"colors":[]}"#, "colors must be an object"),
        (#"{"colors":null}"#, "colors must be an object"),
        (#"{"theme":"unknown"}"#, "theme"),
        (#"{"theme":true}"#, "theme"),
        (#"{"theme":null}"#, "theme"),
        ("{", "Invalid JSON"),
        ("[]", "JSON object"),
        ("null", "JSON object"),
    ]
    for (json, reason) in invalid {
        try Data(json.utf8).write(to: config)
        expectColorSchemeFailure(in: directory, path: config, reason: reason)
    }
}

@Test @MainActor
func selectedTintRequiresAnExistingValidGeneratedTheme() throws {
    let directory = try colorConfigurationDirectory()
    defer { try? FileManager.default.removeItem(at: directory) }
    let theme = directory.appendingPathComponent("theme.json")
    try Data(##"{"theme":"tint","colors":{"accent":"#ffffff"}}"##.utf8)
        .write(to: directory.appendingPathComponent("config.json"))
    expectColorSchemeFailure(in: directory, path: theme)

    let invalid: [(String, String)] = [
        ("not JSON", "Invalid JSON"),
        ("[]", "JSON object"),
        (#"{"theme":"sunset"}"#, "theme"),
        (##"{"colors":{"accent":"#12345678"}}"##, "colors.accent"),
        (##"{"colors":{"glwo":"#123456"}}"##, "colors.glwo"),
        (#"{"colors":false}"#, "colors must be an object"),
    ]
    for (json, reason) in invalid {
        try Data(json.utf8).write(to: theme)
        expectColorSchemeFailure(in: directory, path: theme, reason: reason)
    }

    try Data(#"{"colors":{}}"#.utf8).write(to: theme)
    var expected = ColorScheme.sunset
    expected.accent = NSColor(srgbRed: 1, green: 1, blue: 1, alpha: 1)
    expectSameColors(try ColorScheme.load(from: directory), expected)
}

private func colorConfigurationDirectory() throws -> URL {
    let directory = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString)
    try FileManager.default.createDirectory(at: directory, withIntermediateDirectories: true)
    return directory
}

@MainActor private func expectSameColors(_ actual: ColorScheme, _ expected: ColorScheme) {
    #expect(actual.background == expected.background)
    #expect(actual.text == expected.text)
    #expect(actual.secondaryText == expected.secondaryText)
    #expect(actual.accent == expected.accent)
    #expect(actual.glow == expected.glow)
    #expect(actual.keyBackground == expected.keyBackground)
    #expect(actual.error == expected.error)
}

@MainActor private func expectColorSchemeFailure(in directory: URL, path: URL, reason: String? = nil) {
    do {
        _ = try ColorScheme.load(from: directory)
        Issue.record("Expected invalid color configuration to throw: \(path.path)")
    } catch {
        #expect(error is any LocalizedError)
        #expect(error.localizedDescription.contains(path.path))
        if let reason { #expect(error.localizedDescription.contains(reason)) }
    }
}