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

import Testing
@testable import Confab

@Suite("ConversationMergeService AI response parsing")
struct ConversationMergeServiceParsingTests {

    @Test("Parses a clean JSON array response")
    func parsesCleanJSON() throws {
        let raw = #"[{"role": "user", "content": "hi"}, {"role": "assistant", "content": "hello"}]"#
        let turns = try ConversationMergeService.parseTurns(from: raw)
        #expect(turns == [
            ConversationMergeService.MergedTurn(role: "user", content: "hi"),
            ConversationMergeService.MergedTurn(role: "assistant", content: "hello"),
        ])
    }

    @Test("Parses a JSON array wrapped in markdown code fences")
    func parsesFencedJSON() throws {
        let raw = """
        ```json
        [{"role": "user", "content": "hi"}]
        ```
        """
        let turns = try ConversationMergeService.parseTurns(from: raw)
        #expect(turns == [ConversationMergeService.MergedTurn(role: "user", content: "hi")])
    }

    @Test("Recovers a JSON array embedded in surrounding prose")
    func recoversEmbeddedJSON() throws {
        let raw = """
        Sure, here's the merged conversation:

        [{"role": "user", "content": "hi"}, {"role": "assistant", "content": "hello there"}]

        Let me know if you'd like anything else!
        """
        let turns = try ConversationMergeService.parseTurns(from: raw)
        #expect(turns == [
            ConversationMergeService.MergedTurn(role: "user", content: "hi"),
            ConversationMergeService.MergedTurn(role: "assistant", content: "hello there"),
        ])
    }

    @Test("Bracket matching ignores ']' characters inside quoted content")
    func ignoresBracketsInsideStrings() throws {
        let raw = #"[{"role": "assistant", "content": "array[0] and array[1]"}]"#
        let turns = try ConversationMergeService.parseTurns(from: raw)
        #expect(turns == [ConversationMergeService.MergedTurn(role: "assistant", content: "array[0] and array[1]")])
    }

    @Test("Throws invalidAIResponse when no JSON array is present")
    func throwsWhenNoJSONFound() {
        let raw = "I reverted the latest changes, the search function is not that important."
        #expect(throws: MergeError.self) {
            try ConversationMergeService.parseTurns(from: raw)
        }
    }

    @Test("Throws invalidAIResponse for an empty JSON array")
    func throwsForEmptyArray() {
        #expect(throws: MergeError.self) {
            try ConversationMergeService.parseTurns(from: "[]")
        }
    }
}