import MusicAssistantCore
import XCTest

final class SongProjectValidatorTests: XCTestCase {
    func testValidatorReportsInvalidProjectRelationshipsAndTiming() {
        let project = SongProject(
            title: "Invalid Project",
            idea: "Validate structure",
            duration: SongDuration(seconds: 0),
            bpm: ManualAutoValue(mode: .manual, value: 0),
            sections: [
                SongSection(id: "verse", type: .verse, title: "Verse", startTime: 12, endTime: 8),
                SongSection(id: "verse", type: .chorus, title: "Chorus")
            ],
            instruments: [
                InstrumentTrack(
                    instrumentId: "piano",
                    placements: [InstrumentPlacement(sectionId: "missing", startTime: -1, endTime: 4)]
                )
            ],
            vocalists: [Vocalist(label: "Lead", assignedSections: ["missing"])]
        )

        let issues = SongProjectValidator().validate(project)

        XCTAssertEqual(
            issues,
            [
                .invalidDuration,
                .invalidBPM(0),
                .duplicateSectionID("verse"),
                .invalidSectionTiming("verse"),
                .invalidInstrumentTiming("piano"),
                .unknownSectionReference("missing")
            ]
        )
    }

    func testValidatorAcceptsConsistentProject() {
        let project = SongProject(
            title: "Valid Project",
            idea: "Validate structure",
            duration: SongDuration(seconds: 180),
            bpm: ManualAutoValue(mode: .manual, value: 100),
            sections: [SongSection(id: "verse", type: .verse, title: "Verse", startTime: 0, endTime: 30)],
            instruments: [InstrumentTrack(instrumentId: "piano", placements: [InstrumentPlacement(sectionId: "verse", startTime: 0, endTime: 30)])],
            vocalists: [Vocalist(label: "Lead", assignedSections: ["verse"])]
        )

        XCTAssertTrue(SongProjectValidator().validate(project).isEmpty)
    }
}