#!/bin/bash

# Enhanced File Analysis Help System
# Integrates multiple help sources: custom cheat sheets, tldr, tool database, and workflows

# Color definitions
RED='\033[0;31m'
GREEN='\033[0;32m'
BLUE='\033[0;34m'
YELLOW='\033[1;33m'
CYAN='\033[0;36m'
MAGENTA='\033[0;35m'
NC='\033[0m'

# Help system paths
TOOLS_DB="/opt/remnux-docs/tools.db"
CHEAT_DIR="/opt/cheatsheets"
WORKFLOW_DIR="/opt/remnux-docs/workflows"
TLDR_CACHE="/home/remnux/.local/share/tldr"

# Resolve cheat file names from a user-provided tool name
# Tries several variants: exact, without .py, with .py, hyphen/underscore alternatives
resolve_cheat_file() {
    local name="$1"
    local base=$(echo "$name" | sed 's/\.[Pp][Yy]$//')

    # candidates to try in order
    local candidates=(
        "$name"
        "$base"
        "${base}.py"
        "${base//_/}"
        "${base//-/_}"
        "${base//_/-}"
    )

    for cand in "${candidates[@]}"; do
        if [[ -f "$CHEAT_DIR/personal/$cand" ]]; then
            echo "$CHEAT_DIR/personal/$cand"
            return 0
        fi
        if [[ -f "$CHEAT_DIR/personal/${cand}.cheat" ]]; then
            echo "$CHEAT_DIR/personal/${cand}.cheat"
            return 0
        fi
        if [[ -f "$CHEAT_DIR/${cand}.cheat" ]]; then
            echo "$CHEAT_DIR/${cand}.cheat"
            return 0
        fi
    done
    return 1
}

show_main_help() {
    echo -e "${CYAN}REMnux Analysis Container Help System${NC}"
    echo "======================================="
    echo ""
    echo -e "${GREEN}Getting Started:${NC}"
    echo "  fhelp start                 - Quick start guide (30 seconds)"
    echo ""
    echo -e "${GREEN}Find Tools:${NC}"
    echo "  fhelp tools <keyword>       - Search by name or category"
    echo "  fhelp tools --interactive   - Interactive browser (fzf)"
    echo "  Ctrl+G                      - Interactive cheatsheet browser (navi)"
    echo ""
    echo -e "${GREEN}Get Examples:${NC}"
    echo "  fhelp cheat <tool>          - Usage examples for a specific tool"
    echo "  fhelp quick <command>       - Quick tldr examples"
    echo "  F1 / Ctrl+/                 - Help for command you're typing (zsh)"
    echo ""
    echo -e "${GREEN}Analysis Workflows:${NC}"
    echo "  fhelp workflow              - List all 8 analysis workflows"
    echo "  fhelp workflow <name>       - Show step-by-step workflow"
    echo ""
    echo -e "${GREEN}Other:${NC}"
    echo "  fhelp coverage              - Help coverage statistics"
    echo "  fhelp examples              - Browse all cheat sheets"
    echo "  fhelp --offline             - Verify offline capabilities"
    echo ""
    echo -e "${YELLOW}Shortcuts:${NC} analyse, h, ? (all run fhelp)"
    echo ""
    echo -e "${YELLOW}Examples:${NC}"
    echo "  fhelp tools pdf             # Find PDF analysis tools"
    echo "  fhelp cheat pdfid.py        # pdfid.py usage examples"
    echo "  fhelp workflow static       # Static analysis workflow"
}

show_start() {
    echo -e "${CYAN}Quick Start Guide${NC}"
    echo "================="
    echo ""

    # Count tools
    local tool_count=0
    local rich_count=0
    if [[ -f "$TOOLS_DB" ]]; then
        tool_count=$(wc -l < "$TOOLS_DB" 2>/dev/null || echo 0)
        rich_count=$(grep -c '|rich$' "$TOOLS_DB" 2>/dev/null || echo 0)
    fi

    echo -e "  This container has ${GREEN}${tool_count} analysis tools${NC} installed."
    echo -e "  ${GREEN}${rich_count}${NC} have detailed help with FOR610 lab examples."
    echo ""
    echo -e "${YELLOW}1. Find a tool:${NC}"
    echo "   fhelp tools pdf            # search by keyword"
    echo "   fhelp tools --interactive  # browse with fuzzy search"
    echo ""
    echo -e "${YELLOW}2. Get usage examples:${NC}"
    echo "   fhelp cheat pdfid.py       # cheat sheet with examples"
    echo "   fhelp cheat oledump.py     # Office document analysis"
    echo "   fhelp cheat capa           # malware capabilities"
    echo ""
    echo -e "${YELLOW}3. Follow a workflow:${NC}"
    echo "   fhelp workflow             # list all workflows"
    echo "   fhelp workflow static      # static analysis steps"
    echo "   fhelp workflow document    # document analysis steps"
    echo ""
    echo -e "${YELLOW}4. Interactive help:${NC}"
    echo -e "   ${GREEN}Ctrl+G${NC}                    # browse cheatsheets (navi)"
    echo -e "   ${GREEN}F1${NC} or ${GREEN}Ctrl+/${NC}              # help for command you're typing (zsh)"
    echo ""
    echo -e "${YELLOW}5. Tool tiers:${NC}"
    echo -e "   ${GREEN}[FOR610]${NC} Rich help with lab examples and workflows"
    echo -e "   ${BLUE}[docs]${NC}   Standard help from REMnux documentation"
    echo -e "   ${YELLOW}[basic]${NC}  Minimal help (try: tool --help)"
    echo ""
    echo "Mount your files to /work/ and start analyzing!"
}

show_cheat() {
    local tool="$1"

    if [[ -z "$tool" ]]; then
        echo -e "${RED}Please specify a tool name${NC}"
        echo "Usage: fhelp cheat <tool>"
        return 1
    fi

    # Check for specific workflow cheat sheets first
    local cheat_file=""
    case "$tool" in
        "pdf"|"pdf-analysis")
            cheat_file="$CHEAT_DIR/pdf-analysis.cheat"
            ;;
        "malware"|"malware-analysis")
            cheat_file="$CHEAT_DIR/malware-analysis.cheat"
            ;;
        "system"|"system-utilities")
            cheat_file="$CHEAT_DIR/system-utilities.cheat"
            ;;
        *)
            cheat_file=""
            ;;
    esac

    # If not a workflow cheat, try to resolve tool-specific cheat
    if [[ -z "$cheat_file" || ! -f "$cheat_file" ]]; then
        cheat_file=$(resolve_cheat_file "$tool") || cheat_file=""
    fi

    if [[ -n "$cheat_file" && -f "$cheat_file" ]]; then
        echo -e "${CYAN}Cheat Sheet: ${YELLOW}$tool${NC}"
        echo "$(printf '=%.0s' $(seq 1 $((${#tool} + 14))))"
        echo ""
        # Display cheat file content (skip YAML frontmatter if present)
        awk '/^---$/{if(++c==2) start=1; next} start || !/^---$/ && c!=1' "$cheat_file"
    elif command -v cheat >/dev/null 2>&1 && cheat "$tool" >/dev/null 2>&1; then
        # Fallback: try the cheat command
        echo -e "${CYAN}Cheat Sheet (cheat): ${YELLOW}$tool${NC}"
        echo "$(printf '=%.0s' $(seq 1 $((${#tool} + 22))))"
        echo ""
        cheat "$tool"
    elif command -v tldr >/dev/null 2>&1 && tldr "$tool" >/dev/null 2>&1; then
        # Fallback: try tldr
        echo -e "${CYAN}Quick Reference (tldr): ${YELLOW}$tool${NC}"
        echo "$(printf '=%.0s' $(seq 1 $((${#tool} + 24))))"
        echo ""
        tldr "$tool"
    else
        echo -e "${YELLOW}No help found for '$tool'${NC}"
        echo ""
        # Suggest similar tools
        if [[ -f "$TOOLS_DB" ]]; then
            local matches=$(grep -i "$tool" "$TOOLS_DB" 2>/dev/null | head -5)
            if [[ -n "$matches" ]]; then
                echo "Did you mean one of these?"
                echo "$matches" | while IFS='|' read -r name desc cat usage tier; do
                    local badge=""
                    case "$tier" in
                        rich) badge="${GREEN}[FOR610]${NC}" ;;
                        standard) badge="${BLUE}[docs]${NC}" ;;
                        *) badge="${YELLOW}[basic]${NC}" ;;
                    esac
                    echo -e "  ${GREEN}$name${NC} $badge - $desc"
                done
            fi
        fi
        return 1
    fi
}

show_quick() {
    local command="$1"

    if [[ -z "$command" ]]; then
        echo -e "${RED}Please specify a command name${NC}"
        echo "Usage: fhelp quick <command>"
        return 1
    fi

    echo -e "${CYAN}Quick examples for: ${YELLOW}$command${NC}"
    echo ""

    if command -v tldr >/dev/null 2>&1; then
        if ! tldr "$command" 2>/dev/null; then
            echo -e "${YELLOW}No tldr page found for '$command'${NC}"
            echo "Try: fhelp cheat $command"
        fi
    else
        echo -e "${RED}tldr command not available${NC}"
        return 1
    fi
}

show_tools() {
    local search_term="$1"
    local option="$2"

    case "$search_term" in
        "--interactive")
            if command -v find-tool >/dev/null 2>&1; then
                find-tool --interactive
            else
                echo -e "${RED}find-tool not available${NC}"
            fi
            return
            ;;
        "--list")
            if command -v find-tool >/dev/null 2>&1; then
                find-tool --list
            else
                echo -e "${RED}find-tool not available${NC}"
            fi
            return
            ;;
    esac

    if [[ -z "$search_term" ]]; then
        echo -e "${RED}Please provide a search term${NC}"
        echo "Usage: fhelp tools <search_term>"
        echo "       fhelp tools --interactive"
        echo "       fhelp tools --list"
        return 1
    fi

    echo -e "${CYAN}Searching analysis tools for '${YELLOW}$search_term${CYAN}'...${NC}"
    echo ""

    if command -v find-tool >/dev/null 2>&1; then
        find-tool "$search_term"
    elif [[ -f "$TOOLS_DB" ]]; then
        # Fallback: direct grep on tools.db
        local results=$(grep -i "$search_term" "$TOOLS_DB" 2>/dev/null)
        if [[ -n "$results" ]]; then
            echo "$results" | while IFS='|' read -r name desc cat usage tier; do
                local tier_badge=""
                case "$tier" in
                    rich) tier_badge="${GREEN}[FOR610]${NC}" ;;
                    standard) tier_badge="${BLUE}[docs]${NC}" ;;
                    basic) tier_badge="${YELLOW}[basic]${NC}" ;;
                    *) tier_badge="" ;;
                esac
                echo -e "  ${GREEN}$name${NC} $tier_badge"
                echo "    $desc"
                echo "    Usage: $usage"
                echo ""
            done
        else
            echo "No tools found matching '$search_term'"
        fi
    else
        echo -e "${RED}No tools database available${NC}"
    fi
}

show_examples() {
    echo -e "${CYAN}Available Command Examples${NC}"
    echo ""

    if [[ -d "$CHEAT_DIR/personal" ]]; then
        local count=$(ls -1 "$CHEAT_DIR/personal/"*.cheat 2>/dev/null | wc -l)
        echo -e "${GREEN}Per-tool cheat sheets: $count${NC} (use: fhelp cheat <name>)"
        echo ""
        # Show a sample of tools grouped by first letter
        ls -1 "$CHEAT_DIR/personal/"*.cheat 2>/dev/null | sed 's|.*/||; s|\.cheat$||' | head -30 | sed 's/^/  /'
        if [[ $count -gt 30 ]]; then
            echo "  ... and $((count - 30)) more"
        fi
        echo ""
    fi

    if [[ -d "$CHEAT_DIR" ]]; then
        echo -e "${GREEN}Workflow cheat sheets:${NC}"
        ls -1 "$CHEAT_DIR"/*.cheat 2>/dev/null | sed 's|.*/||; s|\.cheat$||' | sed 's/^/  /'
        echo ""
    fi

    echo -e "${GREEN}Analysis workflows:${NC} (use: fhelp workflow <name>)"
    if [[ -d "$WORKFLOW_DIR" ]]; then
        ls -1 "$WORKFLOW_DIR"/*.txt 2>/dev/null | sed 's|.*/||; s|\.txt$||' | grep -v index | sed 's/^/  /'
    else
        echo "  static-analysis, behavioral-analysis, network-interception"
        echo "  document-analysis, javascript-deobfuscation, unpacking"
        echo "  code-injection, dotnet-analysis"
    fi
}

show_workflow() {
    local name="$1"

    if [[ -z "$name" ]]; then
        # Show workflow index
        if [[ -f "$WORKFLOW_DIR/index.txt" ]]; then
            cat "$WORKFLOW_DIR/index.txt"
        else
            echo -e "${CYAN}Available Analysis Workflows${NC}"
            echo "=============================="
            echo ""
            echo "  static-analysis-workflow     Static Properties Analysis"
            echo "  behavioral-analysis-workflow Behavioral Analysis"
            echo "  network-interception-workflow Network Interception"
            echo "  document-analysis-workflow   Malicious Document Analysis"
            echo "  javascript-deobfuscation-workflow JavaScript Deobfuscation"
            echo "  unpacking-workflow           Unpacking Packed Executables"
            echo "  code-injection-workflow      Code Injection Analysis"
            echo "  dotnet-analysis-workflow     .NET Malware Analysis"
            echo ""
            echo "Usage: fhelp workflow <name>"
            echo "Example: fhelp workflow static-analysis"
        fi
        return
    fi

    # Normalize name: allow partial matches
    local wf_file=""

    # Try exact match first
    if [[ -f "$WORKFLOW_DIR/${name}.txt" ]]; then
        wf_file="$WORKFLOW_DIR/${name}.txt"
    elif [[ -f "$WORKFLOW_DIR/${name}-workflow.txt" ]]; then
        wf_file="$WORKFLOW_DIR/${name}-workflow.txt"
    else
        # Fuzzy match: find workflow files containing the search term
        if [[ -d "$WORKFLOW_DIR" ]]; then
            wf_file=$(ls -1 "$WORKFLOW_DIR"/*.txt 2>/dev/null | grep -i "$name" | grep -v index | head -1)
        fi
    fi

    if [[ -n "$wf_file" && -f "$wf_file" ]]; then
        cat "$wf_file"
    else
        echo -e "${YELLOW}No workflow found matching '$name'${NC}"
        echo ""
        show_workflow  # Show list
    fi
}

show_coverage() {
    echo -e "${CYAN}Help Coverage Statistics${NC}"
    echo "========================"
    echo ""

    if [[ -f "$TOOLS_DB" ]]; then
        local total=$(wc -l < "$TOOLS_DB" 2>/dev/null || echo 0)
        local rich=$(grep -c '|rich$' "$TOOLS_DB" 2>/dev/null || echo 0)
        local standard=$(grep -c '|standard$' "$TOOLS_DB" 2>/dev/null || echo 0)
        local basic=$(grep -c '|basic$' "$TOOLS_DB" 2>/dev/null || echo 0)

        echo -e "  Tools in database:  ${GREEN}$total${NC}"
        echo -e "  Rich help (FOR610): ${GREEN}$rich${NC}"
        echo -e "  Standard (docs):    ${BLUE}$standard${NC}"
        echo -e "  Basic:              ${YELLOW}$basic${NC}"
    else
        echo "  Tools database not available"
    fi

    echo ""

    if [[ -d "$CHEAT_DIR/personal" ]]; then
        local cheats=$(ls -1 "$CHEAT_DIR/personal/"*.cheat 2>/dev/null | wc -l)
        echo -e "  Cheat sheets:       ${GREEN}$cheats${NC}"
    fi

    if [[ -d "$WORKFLOW_DIR" ]]; then
        local wfs=$(ls -1 "$WORKFLOW_DIR"/*.txt 2>/dev/null | grep -cv index 2>/dev/null || echo 0)
        echo -e "  Workflows:          ${GREEN}$wfs${NC}"
    fi
}

show_offline_status() {
    echo -e "${CYAN}Offline Capability Check${NC}"
    echo "==========================="
    echo ""
    echo "Documentation Tools:"

    local tools=("find-tool" "cheat" "tldr")
    for tool in "${tools[@]}"; do
        if command -v "$tool" >/dev/null 2>&1; then
            echo -e "  ${GREEN}+ $tool - available${NC}"
        else
            echo -e "  ${RED}- $tool - missing${NC}"
        fi
    done

    echo ""
    echo "Documentation Files:"

    if [[ -f "$TOOLS_DB" ]]; then
        local db_count=$(wc -l < "$TOOLS_DB" 2>/dev/null || echo 0)
        echo -e "  ${GREEN}+ tools.db - $db_count tools${NC}"
    else
        echo -e "  ${RED}- tools.db - missing${NC}"
    fi

    if [[ -d "$CHEAT_DIR/personal" ]]; then
        local cheat_count=$(ls -1 "$CHEAT_DIR/personal/"*.cheat 2>/dev/null | wc -l)
        echo -e "  ${GREEN}+ cheatsheets - $cheat_count files${NC}"
    else
        echo -e "  ${RED}- cheatsheets - missing${NC}"
    fi

    if [[ -d "$WORKFLOW_DIR" ]]; then
        local wf_count=$(ls -1 "$WORKFLOW_DIR"/*.txt 2>/dev/null | grep -cv index 2>/dev/null || echo 0)
        echo -e "  ${GREEN}+ workflows - $wf_count workflows${NC}"
    else
        echo -e "  ${RED}- workflows - missing${NC}"
    fi

    echo ""
    echo -e "${GREEN}Offline help system ready!${NC}"
}

show_all() {
    echo -e "${CYAN}Complete Help System Overview${NC}"
    echo "================================="
    echo ""

    show_coverage
    echo ""
    show_workflow
    echo ""
    show_offline_status
}

# Main command parsing
case "${1:-}" in
    "start"|"quickstart"|"getting-started")
        show_start
        ;;
    "tools")
        shift
        show_tools "$@"
        ;;
    "cheat")
        shift
        show_cheat "$@"
        ;;
    "quick")
        shift
        show_quick "$@"
        ;;
    "examples")
        show_examples
        ;;
    "workflow")
        shift
        show_workflow "$@"
        ;;
    "pdf")
        show_workflow "document-analysis"
        ;;
    "malware")
        show_workflow "static-analysis"
        ;;
    "forensics")
        show_workflow "behavioral-analysis"
        ;;
    "coverage")
        show_coverage
        ;;
    "--offline")
        show_offline_status
        ;;
    "--all")
        show_all
        ;;
    "--help"|"-h"|"help"|"")
        show_main_help
        ;;
    *)
        # Try as workflow name first, then show error
        if [[ -d "$WORKFLOW_DIR" ]] && ls "$WORKFLOW_DIR"/*.txt 2>/dev/null | grep -qi "$1"; then
            show_workflow "$1"
        else
            echo -e "${RED}Unknown option: $1${NC}"
            echo ""
            show_main_help
        fi
        ;;
esac