package solutions.tretter.githugandroid

/**
 * Port of the upstream ruby-githug `merge_squash` 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 mergeSquashLevel(): Level = level(
    id = "merge_squash",
    title = "Merge Squash",
    description = "Merge all commits from the long-feature-branch as a single commit.",
    hints = listOf("Take a look at the `--squash` option of the merge command. Don't forget to commit the merge!"),
    commandSuggestions = listOf("git merge --squash long-feature-branch", "git commit -m \"Merge long feature\""),
    setup = { RepoState(initialized = true, files = listOf(GitFile("file1", tracked = true)), branches = mapOf("master" to 2, "long-feature-branch" to 4)) },
    nativeSetup = {
        resetFiles()
        write("file1")
        addCommit("First commit", "file1")
        checkoutNew("long-feature-branch")
        write("file3", "some feature\n")
        addCommit("Developing new features", "file3")
        append("file3", "getting awesomer\n")
        addCommit("Takes", "file3")
        append("file3", "and awesomer!\n")
        addCommit("Time", "file3")
        checkout("master")
        write("file2")
        addCommit("Second commit", "file2")
        true
    },
    validator = repoPredicate { repo ->
        repo.commits.firstOrNull()?.message == "Merge long feature" &&
            repo.commits.firstOrNull()?.parentCount == 1 &&
            repo.files.any { it.name == "file3" && it.tracked }
    },
    testCases = listOf(
        levelTestCase("squash merge then commit", "git merge --squash long-feature-branch", "git commit -m \"Merge long feature\""),
    ),
)