import XCTest
@testable import LCEssentials

private struct SamplePayload: Encodable, Sendable {
    let name: String
    let age: Int
}

final class HTTPBodyTests: XCTestCase {

    // MARK: - JSONBody

    func testJSONBodyEncodesPayloadAndContentType() throws {
        let payload = SamplePayload(name: "loverde", age: 3)
        let (data, contentType) = try JSONBody(payload).encoded()

        XCTAssertEqual(contentType, "application/json; charset=UTF-8")

        let decoded = try JSONDecoder().decode([String: AnyDecodable].self, from: data)
        XCTAssertEqual(decoded["name"]?.value as? String, "loverde")
        XCTAssertEqual(decoded["age"]?.value as? Int, 3)
    }

    func testJSONBodyFactory() throws {
        let (data, _) = try jsonBody(SamplePayload(name: "x", age: 1)).encoded()
        XCTAssertFalse(data.isEmpty)
    }

    // MARK: - FormURLEncodedBody

    func testFormURLEncodedEncodesPairsAndPercentEscapes() throws {
        let (data, contentType) = try FormURLEncodedBody(["a": "1", "b": "two words"]).encoded()

        XCTAssertEqual(contentType, "application/x-www-form-urlencoded; charset=UTF-8")

        let pairs = Set(String(data: data, encoding: .utf8)!.split(separator: "&").map(String.init))
        XCTAssertEqual(pairs, ["a=1", "b=two%20words"])
    }

    func testFormURLEncodedEscapesReservedCharactersInsteadOfDropping() throws {
        let (data, _) = try FormURLEncodedBody(["q": "a&b=c"]).encoded()
        let body = String(data: data, encoding: .utf8)!
        XCTAssertEqual(body, "q=a%26b%3Dc")
    }
}

/// Minimal type-erased decoder for asserting JSON shape in tests.
struct AnyDecodable: Decodable {
    let value: Any
    init(from decoder: Decoder) throws {
        let c = try decoder.singleValueContainer()
        if let i = try? c.decode(Int.self) { value = i }
        else if let s = try? c.decode(String.self) { value = s }
        else if let b = try? c.decode(Bool.self) { value = b }
        else if let d = try? c.decode(Double.self) { value = d }
        else { value = "" }
    }
}