#!/usr/bin/env pwsh

<#
.SYNOPSIS
    Verifies the Module 01 challenge solution.

.DESCRIPTION
    Checks if the student has correctly:
    - Initialized a git repository
    - Created two commits with the correct messages
    - Committed the correct files
#>

Write-Host "Verifying Module 01: Git Basics Challenge..." -ForegroundColor Cyan
Write-Host ""

$allChecksPassed = $true

# Check if challenge directory exists
if (-not (Test-Path "challenge")) {
    Write-Host "[FAIL] Challenge directory not found. Run setup.ps1 first." -ForegroundColor Red
    exit 1
}

Set-Location "challenge"

# Check if git repository exists
if (-not (Test-Path ".git")) {
    Write-Host "[FAIL] No git repository found. Did you run 'git init'?" -ForegroundColor Red
    Set-Location ".."
    exit 1
}

Write-Host "[PASS] Git repository initialized" -ForegroundColor Green

# Check number of commits
$commitCount = (git rev-list --all --count 2>$null)
if ($commitCount -ne 2) {
    Write-Host "[FAIL] Expected 2 commits, found $commitCount" -ForegroundColor Red
    $allChecksPassed = $false
} else {
    Write-Host "[PASS] Correct number of commits (2)" -ForegroundColor Green
}

# Get commit messages (newest first)
$commits = git log --pretty=format:"%s" --reverse 2>$null

if ($commits) {
    $commitArray = $commits -split "`n"

    # Check first commit
    if ($commitArray.Count -ge 1) {
        if ($commitArray[0] -eq "Add welcome file") {
            Write-Host "[PASS] First commit message correct" -ForegroundColor Green
        } else {
            Write-Host "[FAIL] First commit message incorrect. Expected 'Add welcome file', got '$($commitArray[0])'" -ForegroundColor Red
            $allChecksPassed = $false
        }

        # Check files in first commit
        $filesInFirstCommit = git diff-tree --no-commit-id --name-only -r HEAD~1 2>$null
        if ($filesInFirstCommit -match "welcome.txt") {
            Write-Host "[PASS] First commit contains welcome.txt" -ForegroundColor Green
        } else {
            Write-Host "[FAIL] First commit should contain welcome.txt" -ForegroundColor Red
            $allChecksPassed = $false
        }
    }

    # Check second commit
    if ($commitArray.Count -ge 2) {
        if ($commitArray[1] -eq "Add instructions") {
            Write-Host "[PASS] Second commit message correct" -ForegroundColor Green
        } else {
            Write-Host "[FAIL] Second commit message incorrect. Expected 'Add instructions', got '$($commitArray[1])'" -ForegroundColor Red
            $allChecksPassed = $false
        }

        # Check files in second commit
        $filesInSecondCommit = git diff-tree --no-commit-id --name-only -r HEAD 2>$null
        if ($filesInSecondCommit -match "instructions.txt") {
            Write-Host "[PASS] Second commit contains instructions.txt" -ForegroundColor Green
        } else {
            Write-Host "[FAIL] Second commit should contain instructions.txt" -ForegroundColor Red
            $allChecksPassed = $false
        }
    }
}

Set-Location ".."

Write-Host ""
if ($allChecksPassed) {
    Write-Host "========================================" -ForegroundColor Green
    Write-Host "  CONGRATULATIONS! Challenge Complete!  " -ForegroundColor Green
    Write-Host "========================================" -ForegroundColor Green
    Write-Host ""
    Write-Host "You've mastered the basics of git!" -ForegroundColor Cyan
    Write-Host "You can now move on to Module 02." -ForegroundColor Cyan
    Write-Host ""
} else {
    Write-Host "========================================" -ForegroundColor Red
    Write-Host "  Challenge Not Complete - Try Again!  " -ForegroundColor Red
    Write-Host "========================================" -ForegroundColor Red
    Write-Host ""
    Write-Host "Review the errors above and try again." -ForegroundColor Yellow
    Write-Host "Hint: Check 'git log' and 'git status' to see what you've done." -ForegroundColor Yellow
    Write-Host ""
    exit 1
}