//
//  DatabaseServiceTests.swift
//  oAITests
//
// SPDX-License-Identifier: PolyForm-Noncommercial-1.0.0
// Copyright (C) 2026 Rune Olsen

import Testing
import Foundation
@testable import oAI

@Suite("DatabaseService migrations, against a throwaway in-memory queue")
struct DatabaseServiceMigrationTests {

    @Test("All v1-v8 tables exist after migration")
    func allTablesExist() {
        let db = DatabaseService.makeInMemory()
        let expectedTables = [
            "conversations", "messages", "settings", "command_history",
            "email_logs", "message_metadata", "message_embeddings",
            "conversation_embeddings", "conversation_summaries",
        ]
        for table in expectedTables {
            #expect(db.tableExists(table), "expected table \(table) to exist")
        }
    }

    @Test("v4 adds modelId to messages and primaryModel to conversations")
    func v4AddsModelColumns() {
        let db = DatabaseService.makeInMemory()
        #expect(db.columnNames(in: "messages").contains("modelId"))
        #expect(db.columnNames(in: "conversations").contains("primaryModel"))
    }

    @Test("messages table has the expected v1 columns")
    func messagesTableColumns() {
        let db = DatabaseService.makeInMemory()
        let columns = Set(db.columnNames(in: "messages"))
        let expected: Set<String> = ["id", "conversationId", "role", "content", "tokens", "cost", "timestamp", "sortOrder"]
        #expect(expected.isSubset(of: columns))
    }

    @Test("message_metadata table has the expected v6 columns")
    func messageMetadataColumns() {
        let db = DatabaseService.makeInMemory()
        let columns = Set(db.columnNames(in: "message_metadata"))
        #expect(columns == ["message_id", "importance_score", "user_starred", "summary", "chunk_index"])
    }

    @Test("conversation_summaries table has the expected v8 columns")
    func conversationSummariesColumns() {
        let db = DatabaseService.makeInMemory()
        let columns = Set(db.columnNames(in: "conversation_summaries"))
        #expect(columns == ["id", "conversation_id", "start_message_index", "end_message_index", "summary", "token_count", "created_at", "summary_model"])
    }

    @Test("A nonexistent table reports as absent, not a crash")
    func nonexistentTableReportsAbsent() {
        let db = DatabaseService.makeInMemory()
        #expect(db.tableExists("not_a_real_table") == false)
    }

    @Test("Two in-memory instances are isolated from each other")
    func instancesAreIsolated() throws {
        let dbA = DatabaseService.makeInMemory()
        let dbB = DatabaseService.makeInMemory()

        _ = try dbA.saveConversation(name: "only in A", messages: [Message(role: .user, content: "hi")])

        #expect(try dbA.listConversations().count == 1)
        #expect(try dbB.listConversations().count == 0)
    }
}

@Suite("DatabaseService settings CRUD, against a throwaway in-memory queue")
struct DatabaseServiceSettingsTests {

    @Test("Round-trips a plain setting")
    func roundTripsSetting() {
        let db = DatabaseService.makeInMemory()
        db.setSetting(key: "theme", value: "dark")
        #expect((try? db.loadAllSettings()["theme"]) == "dark")
    }

    @Test("Deletes a setting")
    func deletesSetting() {
        let db = DatabaseService.makeInMemory()
        db.setSetting(key: "temp", value: "1")
        db.deleteSetting(key: "temp")
        #expect((try? db.loadAllSettings()["temp"]) == nil)
    }
}

@Suite("DatabaseService conversation + message persistence, against a throwaway in-memory queue")
struct DatabaseServiceConversationTests {

    @Test("Saving a conversation round-trips its messages via loadConversation")
    func savesAndLoadsConversation() throws {
        let db = DatabaseService.makeInMemory()
        let messages = [
            Message(role: .user, content: "hello"),
            Message(role: .assistant, content: "hi there"),
        ]
        let saved = try db.saveConversation(name: "Test Chat", messages: messages)

        let loaded = try db.loadConversation(id: saved.id)
        #expect(loaded?.0.name == "Test Chat")
        #expect(loaded?.1.map(\.content) == ["hello", "hi there"])
    }

    @Test("System messages are excluded from persistence")
    func systemMessagesExcluded() throws {
        let db = DatabaseService.makeInMemory()
        let messages = [
            Message(role: .system, content: "tool call"),
            Message(role: .user, content: "hello"),
        ]
        let saved = try db.saveConversation(name: "Test", messages: messages)
        let loaded = try db.loadConversation(id: saved.id)
        #expect(loaded?.1.count == 1)
        #expect(loaded?.1.first?.content == "hello")
    }
}