#!/bin/bash

# Task Manager - Main CLI Orchestrator
# Compose smaller scripts to create a unified task management system

set -o pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
LIB_DIR="$SCRIPT_DIR/lib"

source "$LIB_DIR/task-common.sh"

# Check if jq is available
check_jq() {
    if ! command -v jq &> /dev/null; then
        log_warn "jq not found - some features will have limited functionality"
    fi
}

# Print help
show_help() {
    cat <<'EOF'

Task Manager - Unified Task Tracking System

USAGE:
  task.sh <command> [options]

COMMANDS:

  parse <file|dir>              Extract tasks from Markdown files as JSON
    Options:
      --json                    Output as JSON (default)
      --table                   Output as formatted table

  query <criteria>              Query and filter tasks from JSON input (via pipe)
    Options:
      --status <status>         Filter by status (Draft|Planning|In Progress|Completed|Blocked)
      --priority <priority>     Filter by priority (critical|high|medium|low)
      --owner <owner>           Filter by owner
      --id <id>                 Find specific task by ID
      --search <text>           Search in title/description
      --unassigned              Find unassigned tasks
      --blockers                Find tasks with dependencies
      --dependents <id>         Find tasks that depend on this task
      --count <field>           Count tasks by field
      --sort <field>            Sort by field
      --table                   Format as table

  update <file> <id> [options]  Update task properties in place
    Options:
      --status <status>         Set status
      --priority <priority>     Set priority
      --owner <owner>           Set owner
      --effort <effort>         Set effort estimate

  report [type]                 Generate reports from task JSON (via pipe)
    Types:
      --summary                 Summary statistics
      --board                   Kanban board view
      --priority                Tasks grouped by priority
      --owner                   Tasks grouped by owner
      --dependencies            Dependency graph
      --burndown                Progress/burndown chart
      --csv                     Export as CSV
      --all                     All reports

  validate [type]               Validate task consistency (via pipe)
    Types:
      --schema                  Validate schema compliance
      --dependencies            Validate dependencies exist
      --uniqueness              Check for duplicate IDs
      --all                     Full validation (default)

  list                          Quick task listing with filtering
    Options:
      (same as query)

EXAMPLES:

  # Parse all tasks from a plan file
  ./task.sh parse pln-001-roadmap.md

  # Parse all tasks in a directory
  ./task.sh parse ./specs/

  # Find all high-priority tasks
  ./task.sh parse . | ./task.sh query --priority high

  # Find tasks assigned to Alice
  ./task.sh parse . | ./task.sh query --owner "Alice" --table

  # Find unassigned tasks across all plans
  ./task.sh parse specs/ | ./task.sh query --unassigned --table

  # Generate a kanban board
  ./task.sh parse . | ./task.sh report --board

  # Export tasks as CSV
  ./task.sh parse . | ./task.sh report --csv

  # Validate all tasks
  ./task.sh parse . | ./task.sh validate --all

  # Update task status
  ./task.sh update pln-001-roadmap.md tsk-001 --status "In Progress"

  # Update multiple fields
  ./task.sh update pln-001-roadmap.md tsk-001 --status "Completed" --priority "high"

PIPING EXAMPLES:

  # Find completed tasks by priority
  ./task.sh parse . | ./task.sh query --status "Completed" | ./task.sh query --priority "high" | ./task.sh report --summary

  # Find all blockers assigned to a person
  ./task.sh parse . | ./task.sh query --owner "Bob" | ./task.sh query --blockers | ./task.sh report --board

  # Generate CSV of all in-progress tasks
  ./task.sh parse . | ./task.sh query --status "In Progress" | ./task.sh report --csv > tasks.csv

NOTES:
  - JSON piping allows composing commands together
  - Update operations modify files in place with automatic backups
  - All text output uses colors (disable with NO_COLOR env var)
  - Requires jq for full functionality (graceful degradation without it)

EOF
}

# Main command routing
main() {
    check_jq

    if [[ $# -eq 0 ]] || [[ "$1" == "-h" ]] || [[ "$1" == "--help" ]]; then
        show_help
        return 0
    fi

    local command="$1"
    shift

    case "$command" in
        parse)
            bash "$LIB_DIR/task-parse.sh" "$@"
            ;;
        query)
            bash "$LIB_DIR/task-query.sh" "$@"
            ;;
        update)
            bash "$LIB_DIR/task-update.sh" "$@"
            ;;
        report)
            bash "$LIB_DIR/task-report.sh" "$@"
            ;;
        validate)
            bash "$LIB_DIR/task-validate.sh" "$@"
            ;;
        list)
            # Convenience command: parse + query
            if [[ $# -eq 0 ]]; then
                log_error "Usage: task.sh list <file|dir> [query options]"
                return 1
            fi
            local target="$1"
            shift
            bash "$LIB_DIR/task-parse.sh" "$target" | bash "$LIB_DIR/task-query.sh" "$@"
            ;;
        --version)
            echo "Task Manager v0.1.0"
            ;;
        *)
            log_error "Unknown command: $command"
            echo ""
            show_help
            return 1
            ;;
    esac
}

# Execute main
main "$@"