#!/usr/bin/env pwsh
<#
.SYNOPSIS
    Verifies the Module 05 challenge solution.

.DESCRIPTION
    This script checks that:
    - The challenge directory exists
    - A Git repository exists
    - No merge conflicts remain
    - The merge was completed successfully
    - Conflict markers have been removed from files
#>

Write-Host "`n=== Verifying Module 05 Solution ===" -ForegroundColor Cyan

$allChecksPassed = $true

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

Set-Location "challenge"

# Check if git repository exists
if (-not (Test-Path ".git")) {
    Write-Host "[FAIL] Not a git repository. Did you run setup.ps1?" -ForegroundColor Red
    Set-Location ..
    exit 1
}

# Check current branch is main
$currentBranch = git branch --show-current 2>$null
if ($currentBranch -eq "main") {
    Write-Host "[PASS] Currently on main branch" -ForegroundColor Green
} else {
    Write-Host "[FAIL] Not on main branch (currently on: $currentBranch)" -ForegroundColor Red
    Write-Host "[HINT] Switch to main with: git checkout main" -ForegroundColor Yellow
    $allChecksPassed = $false
}

# Check if there are any unresolved conflicts
$gitStatus = git status --porcelain 2>$null
$hasConflicts = git status | Select-String "Unmerged paths" 2>$null

if ($hasConflicts) {
    Write-Host "[FAIL] Unresolved merge conflicts still exist" -ForegroundColor Red
    Write-Host "[HINT] Open app.py, resolve conflicts, then: git add app.py && git commit" -ForegroundColor Yellow
    $allChecksPassed = $false
} else {
    Write-Host "[PASS] No unresolved conflicts" -ForegroundColor Green
}

# Check if app.py exists
if (-not (Test-Path "app.py")) {
    Write-Host "[FAIL] app.py not found" -ForegroundColor Red
    Write-Host "[HINT] Did you run setup.ps1?" -ForegroundColor Yellow
    $allChecksPassed = $false
    Set-Location ..
    exit 1
}

# Check if app.py contains conflict markers
$appContent = Get-Content "app.py" -Raw
if ($appContent -match "<<<<<<< HEAD" -or $appContent -match "=======" -or $appContent -match ">>>>>>>") {
    Write-Host "[FAIL] Conflict markers still present in app.py" -ForegroundColor Red
    Write-Host "[HINT] Edit app.py to remove all conflict markers (<<<<<<< ======= >>>>>>>)" -ForegroundColor Yellow
    $allChecksPassed = $false
} else {
    Write-Host "[PASS] No conflict markers in app.py" -ForegroundColor Green
}

# Check if a merge commit exists
$mergeCommits = git log --merges --oneline 2>$null
if ($mergeCommits) {
    Write-Host "[PASS] Merge commit exists (conflict was resolved and committed)" -ForegroundColor Green
} else {
    # Check if we're in the middle of a merge
    if (Test-Path ".git/MERGE_HEAD") {
        Write-Host "[FAIL] Merge not completed - still in progress" -ForegroundColor Red
        Write-Host "[HINT] After resolving conflicts and staging with 'git add', run 'git commit'" -ForegroundColor Yellow
        $allChecksPassed = $false
    } else {
        Write-Host "[FAIL] No merge commit found" -ForegroundColor Red
        Write-Host "[HINT] Did you merge feature-updates into main?" -ForegroundColor Yellow
        $allChecksPassed = $false
    }
}

# Check that file has actual content (not just conflict markers removed)
if ($appContent -match "def main\(\):" -and $appContent -match "print") {
    Write-Host "[PASS] app.py contains valid Python code" -ForegroundColor Green
} else {
    Write-Host "[FAIL] app.py appears to be incomplete or damaged" -ForegroundColor Red
    $allChecksPassed = $false
}

Set-Location ..

# Final summary
if ($allChecksPassed) {
    Write-Host "`n" -NoNewline
    Write-Host "=====================================" -ForegroundColor Green
    Write-Host "   CONGRATULATIONS! CHALLENGE PASSED!" -ForegroundColor Green
    Write-Host "=====================================" -ForegroundColor Green
    Write-Host "`nYou've successfully resolved a merge conflict!" -ForegroundColor Cyan
    Write-Host "You now understand:" -ForegroundColor Cyan
    Write-Host "  - How merge conflicts occur (same lines changed differently)" -ForegroundColor White
    Write-Host "  - How to recognize conflict markers" -ForegroundColor White
    Write-Host "  - How to manually resolve conflicts" -ForegroundColor White
    Write-Host "  - How to complete a merge after resolution (git add + git commit)" -ForegroundColor White
    Write-Host "`nThis is a crucial skill for collaborative development!" -ForegroundColor Green
    Write-Host "Ready for the next module!" -ForegroundColor Green
    Write-Host ""
} else {
    Write-Host "`n[SUMMARY] Some checks failed. Review the hints above and try again." -ForegroundColor Red
    Write-Host "[INFO] You can run this verification script as many times as needed." -ForegroundColor Yellow
    Write-Host "[TIP] If stuck, run 'git status' to see what state you're in." -ForegroundColor Cyan
    Write-Host ""
    exit 1
}