#!/usr/bin/env pwsh
<#
.SYNOPSIS
    Verifies the Module 02 challenge solution.

.DESCRIPTION
    This script checks that:
    - The challenge directory exists
    - A Git repository exists
    - answers.txt exists with correct information about commit history
#>

Write-Host "`n=== Verifying Module 02 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 if answers.md exists
if (-not (Test-Path "answers.md")) {
    Write-Host "[FAIL] answers.md not found. Did you run setup.ps1?" -ForegroundColor Red
    Write-Host "[HINT] The setup script should have created answers.md for you" -ForegroundColor Yellow
    $allChecksPassed = $false
} else {
    Write-Host "[PASS] answers.md exists" -ForegroundColor Green

    # Read the answers file
    $answers = Get-Content "answers.md" -Raw
    $answersLower = $answers.ToLower()

    # Check 1: Contains "5" or "five" for commit count
    if ($answersLower -match "5|five") {
        Write-Host "[PASS] Correct commit count found" -ForegroundColor Green
    } else {
        Write-Host "[FAIL] Commit count not found or incorrect" -ForegroundColor Red
        Write-Host "[HINT] Use 'git log --oneline' to count commits easily" -ForegroundColor Yellow
        $allChecksPassed = $false
    }

    # Check 2: Contains "database" keyword for third commit
    if ($answersLower -match "database") {
        Write-Host "[PASS] Third commit message identified" -ForegroundColor Green
    } else {
        Write-Host "[FAIL] Third commit message not found" -ForegroundColor Red
        Write-Host "[HINT] Use 'git log' to see commit messages in order" -ForegroundColor Yellow
        $allChecksPassed = $false
    }

    # Check 3: Contains both "auth" and "database" keywords for files modified in bug fix
    $hasAuth = $answersLower -match "auth"
    $hasDatabase = $answersLower -match "database"

    if ($hasAuth -and $hasDatabase) {
        Write-Host "[PASS] Both files identified for bug fix commit" -ForegroundColor Green
    } elseif ($hasAuth -or $hasDatabase) {
        Write-Host "[PARTIAL] Only one file found - there are TWO files modified in this commit" -ForegroundColor Yellow
        Write-Host "[HINT] Use 'git log --stat' or 'git show <commit-hash> --name-only' to see ALL files changed" -ForegroundColor Yellow
        $allChecksPassed = $false
    } else {
        Write-Host "[FAIL] Files modified in bug fix commit not found" -ForegroundColor Red
        Write-Host "[HINT] Use 'git log --stat' to see which files were changed in each commit" -ForegroundColor Yellow
        $allChecksPassed = $false
    }

    # Check 4: Contains "config" keyword for staged file
    if ($answersLower -match "config") {
        Write-Host "[PASS] Staged file identified" -ForegroundColor Green
    } else {
        Write-Host "[FAIL] Staged file not identified" -ForegroundColor Red
        Write-Host "[HINT] Use 'git status' or 'git diff --staged' to see staged changes" -ForegroundColor Yellow
        $allChecksPassed = $false
    }

    # Check 5: Contains "unicorn" for the secret code
    if ($answersLower -match "unicorn") {
        Write-Host "[PASS] Secret code found!" -ForegroundColor Green
    } else {
        Write-Host "[FAIL] Secret code not found" -ForegroundColor Red
        Write-Host "[HINT] Use 'git diff <commit3> <commit4> database.py' to find the secret code" -ForegroundColor Yellow
        $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 explored Git commit history!" -ForegroundColor Cyan
    Write-Host "You now know how to:" -ForegroundColor Cyan
    Write-Host "  - View commit history with git log" -ForegroundColor White
    Write-Host "  - Find specific commits and their messages" -ForegroundColor White
    Write-Host "  - See which files changed in commits" -ForegroundColor White
    Write-Host "  - Check staged changes with git diff --staged" -ForegroundColor White
    Write-Host "  - Compare changes between specific commits with git diff" -ForegroundColor White
    Write-Host "`nReady 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 ""
    exit 1
}