package solutions.tretter.githugandroid

/**
 * Port of the upstream ruby-githug `merge` level.
 *
 * Setup documents the repository shape the learner explores. Evaluation is kept
 * state-based whenever the exercise changes repository objects; answer-only
 * levels intentionally validate the answer entered at the prompt.
 */
internal fun mergeLevel(): Level = level(
    id = "merge",
    title = "Merge",
    description = "We have a file in the branch 'feature'. Let's merge it with the master branch.",
    hints = listOf("You want to research the `git merge` command."),
    commandSuggestions = listOf("git merge feature"),
    setup = { RepoState(initialized = true, files = listOf(GitFile("file1", tracked = true)), branches = mapOf("master" to 1, "feature" to 2)) },
    nativeSetup = {
        resetFiles()
        write("file1")
        addCommit("added file1", "file1")
        checkoutNew("feature")
        write("file2")
        addCommit("added file2", "file2")
        checkout("master")
        true
    },
    validator = repoPredicate { repo ->
        repo.headBranch == "master" &&
            repo.files.any { it.name == "file2" && it.tracked }
    },
    testCases = listOf(
        levelTestCase("merge feature", "git merge feature"),
        levelTestCase("merge feature with explicit merge commit", "git merge --no-ff feature -m \"Merge feature\""),
    ),
    negativeTestCases = listOf(
        levelTestCase("switching to feature does not solve", "git switch feature"),
    ),
)