import Foundation
import Testing
import SstCore
@testable import SstData

@MainActor
struct HistoryStoreTests {
    func tempFile() -> URL {
        FileManager.default.temporaryDirectory.appending(path: "sst-tests-\(UUID().uuidString)/history.json")
    }

    func entry(_ text: String, at seconds: TimeInterval) -> HistoryEntry {
        HistoryEntry(date: Date(timeIntervalSince1970: 1_700_000_000 + seconds), duration: 2, rawText: text, finalText: text)
    }

    @Test func newestEntryComesFirstAndSurvivesARoundTrip() {
        let url = tempFile()
        let store = HistoryStore(fileURL: url)
        store.add(entry("eerste", at: 0))
        store.add(HistoryEntry(
            date: Date(timeIntervalSince1970: 1_700_000_100), duration: 3, rawText: "cloud code", finalText: "Claude Code",
            corrections: [AppliedCorrection(heard: "cloud code", wrote: "Claude Code", rule: "cloud code", start: 0, length: 11)]))
        store.flush()

        let reloaded = HistoryStore(fileURL: url)
        #expect(reloaded.load() == .loaded)
        #expect(reloaded.entries.map(\.finalText) == ["Claude Code", "eerste"])
        #expect(reloaded.entries == store.entries)
    }

    @Test func missingFileIsEmpty() {
        let store = HistoryStore(fileURL: tempFile())
        #expect(store.load() == .empty)
        #expect(store.entries.isEmpty)
    }

    @Test func removeAndRemoveAll() {
        let store = HistoryStore(fileURL: tempFile())
        let a = entry("a", at: 0), b = entry("b", at: 1)
        store.add(a); store.add(b)
        store.remove(id: a.id)
        #expect(store.entries.map(\.finalText) == ["b"])
        store.removeAll()
        #expect(store.entries.isEmpty)
    }

    @Test func corruptFileIsMovedAsideAndStoreStartsFresh() throws {
        let url = tempFile()
        try FileManager.default.createDirectory(at: url.deletingLastPathComponent(), withIntermediateDirectories: true)
        try "dit is geen json".write(to: url, atomically: true, encoding: .utf8)
        let store = HistoryStore(fileURL: url)
        guard case .recoveredCorrupt(let backup) = store.load() else {
            Issue.record("expected recoveredCorrupt"); return
        }
        #expect(FileManager.default.fileExists(atPath: backup.path))
        #expect(!FileManager.default.fileExists(atPath: url.path))
        #expect(store.entries.isEmpty)
    }

    @Test func loadNotifiesOnChange() {
        let url = tempFile()
        let writer = HistoryStore(fileURL: url)
        writer.add(entry("a", at: 0)); writer.add(entry("b", at: 1))
        writer.flush()

        let store = HistoryStore(fileURL: url)
        var calls = 0
        store.onChange = { calls += 1 }
        #expect(store.load() == .loaded)
        #expect(calls == 1)
        #expect(store.entries.count == 2)
    }

    @Test func unreadableFileIsReportedAndNeverOverwritten() throws {
        let url = tempFile()
        try FileManager.default.createDirectory(at: url, withIntermediateDirectories: true)   // history.json is a directory
        let store = HistoryStore(fileURL: url)
        guard case .unreadable = store.load() else {
            Issue.record("expected unreadable"); return
        }
        store.add(entry("a", at: 0))
        store.flush()
        var isDirectory: ObjCBool = false
        #expect(FileManager.default.fileExists(atPath: url.path, isDirectory: &isDirectory))
        #expect(isDirectory.boolValue)
        #expect(store.lastError != nil)
    }

    @Test func onChangeFiresForEdits() {
        let store = HistoryStore(fileURL: tempFile())
        var calls = 0
        store.onChange = { calls += 1 }
        store.add(entry("a", at: 0))
        store.removeAll()
        #expect(calls == 2)
    }

    @Test func entryFromDictationResultKeepsEverything() {
        let result = DictationResult(
            date: Date(timeIntervalSince1970: 1_700_000_000), duration: 4.5, rawText: "raw", finalText: "final",
            corrections: [AppliedCorrection(heard: "a", wrote: "b", rule: "a", start: 0, length: 1)])
        let e = HistoryEntry(result: result)
        #expect(e.rawText == "raw" && e.finalText == "final" && e.duration == 4.5 && e.corrections.count == 1)
    }
}

struct HistorySearchTests {
    let entries = [
        HistoryEntry(date: .now, duration: 1, rawText: "ik ga naar het café", finalText: "Ik ga naar het Café"),
        HistoryEntry(date: .now, duration: 1, rawText: "cloud code is handig", finalText: "Claude Code is handig"),
    ]

    @Test func emptyQueryReturnsEverything() {
        #expect(HistorySearch.filter(entries, query: "  ").count == 2)
    }

    @Test func ignoresCaseAndDiacritics() {
        #expect(HistorySearch.filter(entries, query: "CAFE").count == 1)
        #expect(HistorySearch.filter(entries, query: "café").count == 1)
    }

    @Test func allWordsMustMatchInAnyOrder() {
        #expect(HistorySearch.filter(entries, query: "handig claude").count == 1)
        #expect(HistorySearch.filter(entries, query: "handig café").isEmpty)
    }

    @Test func searchesTheOriginalTextToo() {
        #expect(HistorySearch.filter(entries, query: "cloud").count == 1)
    }
}

struct HistoryGroupingTests {
    @Test func groupsByDayKeepingOrder() {
        var calendar = Calendar(identifier: .gregorian)
        calendar.timeZone = TimeZone(identifier: "UTC")!
        func at(_ day: Int, _ hour: Int) -> Date {
            calendar.date(from: DateComponents(year: 2026, month: 10, day: day, hour: hour))!
        }
        let entries = [at(2, 15), at(2, 9), at(1, 20)].map {
            HistoryEntry(date: $0, duration: 1, rawText: "x", finalText: "x")
        }
        let days = HistoryGrouping.byDay(entries, calendar: calendar)
        #expect(days.count == 2)
        #expect(days[0].entries.count == 2)
        #expect(days[1].entries.count == 1)
        #expect(days[0].day > days[1].day)
    }
}

@MainActor
struct HistoryEditTests {
    @Test func updateTextReplacesFinalTextAndDropsCorrections() {
        let store = HistoryStore(fileURL: FileManager.default.temporaryDirectory.appending(path: "sst-tests-\(UUID().uuidString)/history.json"))
        let item = HistoryEntry(
            date: Date(), duration: 2, rawText: "cloud code", finalText: "Claude Code",
            corrections: [AppliedCorrection(heard: "cloud code", wrote: "Claude Code", rule: "cloud code", start: 0, length: 11)])
        store.add(item)
        store.updateText(id: item.id, to: "Claude Code is fijn")
        #expect(store.entries[0].finalText == "Claude Code is fijn")
        #expect(store.entries[0].rawText == "cloud code")
        #expect(store.entries[0].corrections.isEmpty)
    }

    @Test func updateTextOfUnknownIdIsHarmless() {
        let store = HistoryStore(fileURL: FileManager.default.temporaryDirectory.appending(path: "sst-tests-\(UUID().uuidString)/history.json"))
        store.updateText(id: UUID(), to: "x")
        #expect(store.entries.isEmpty)
    }
}