#!/usr/bin/env bats
#
# BATS tests for siter-solar-analysis.sh
# Run with: bats tests/
#

SCRIPT_PATH="/app/solar-analysis/siter-solar-analysis.sh"

@test "script exists and is executable" {
    [ -f "$SCRIPT_PATH" ]
    [ -x "$SCRIPT_PATH" ]
}

@test "help option displays usage" {
    run "$SCRIPT_PATH" --help
    [ "$status" -eq 0 ]
    [[ "$output" == *"SITER Solar Analysis"* ]]
    [[ "$output" == *"USAGE:"* ]]
    [[ "$output" == *"--api-key"* ]]
    [[ "$output" == *"--scenarios"* ]]
    [[ "$output" == *"NREL_API_KEY"* ]]
}

@test "version option displays version" {
    run "$SCRIPT_PATH" --version
    [ "$status" -eq 0 ]
    [[ "$output" =~ "siter-solar-analysis version "[0-9]+\.[0-9]+\.[0-9]+ ]]
}

@test "invalid option returns error" {
    run "$SCRIPT_PATH" --invalid-option
    [ "$status" -eq 1 ]
    [[ "$output" == *"Unknown option"* ]]
}

@test "dependencies are available" {
    command -v curl
    command -v jq
    command -v bc
}

@test "invalid latitude returns error" {
    run "$SCRIPT_PATH" --lat "invalid"
    [ "$status" -eq 1 ]
}

@test "out of range latitude returns error" {
    run "$SCRIPT_PATH" --lat "999"
    [ "$status" -eq 1 ]
}

@test "invalid longitude returns error" {
    run "$SCRIPT_PATH" --lon "abc"
    [ "$status" -eq 1 ]
}

@test "JSON output is valid JSON" {
    run "$SCRIPT_PATH" --json
    if [ "$status" -eq 0 ]; then
        echo "$output" | jq .
    fi
}

@test "JSON output has required fields" {
    run "$SCRIPT_PATH" --json
    if [ "$status" -eq 0 ]; then
        echo "$output" | jq -e '.system'
        echo "$output" | jq -e '.production'
        echo "$output" | jq -e '.financials'
    fi
}

@test "text output shows expected sections" {
    run "$SCRIPT_PATH"
    if [ "$status" -eq 0 ]; then
        [[ "$output" == *"SITER SOLAR PROJECT"* ]]
        [[ "$output" == *"NREL PVWATTS ANALYSIS"* ]]
        [[ "$output" == *"System Configuration:"* ]]
        [[ "$output" == *"FINANCIAL ANALYSIS"* ]]
        [[ "$output" == *"ROI ANALYSIS"* ]]
        [[ "$output" == *"PAYBACK PERIOD"* ]]
    fi
}

@test "monthly production table shows all months" {
    run "$SCRIPT_PATH"
    if [ "$status" -eq 0 ]; then
        for month in Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec; do
            [[ "$output" == *"$month"* ]]
        done
        [[ "$output" == *"ANNUAL"* ]]
    fi
}

@test "scenarios mode shows header" {
    run "$SCRIPT_PATH" --scenarios
    if [ "$status" -eq 0 ]; then
        [[ "$output" == *"SYSTEM SIZE SCENARIOS"* ]]
    fi
}

@test "scenarios shows panel options" {
    run "$SCRIPT_PATH" --scenarios
    if [ "$status" -eq 0 ]; then
        [[ "$output" == *"250W"* ]]
        [[ "$output" == *"400W"* ]]
    fi
}

@test "scenarios JSON output is array" {
    run "$SCRIPT_PATH" --scenarios --json
    if [ "$status" -eq 0 ]; then
        local type
        type=$(echo "$output" | jq -r 'type')
        [ "$type" == "array" ]
    fi
}

@test "custom panel configuration works" {
    run "$SCRIPT_PATH" -p 20 -w 400
    if [ "$status" -eq 0 ]; then
        [[ "$output" == *"20 × 400W"* ]]
        [[ "$output" == *"8.0 kW"* ]]
    fi
}

@test "invalid API key returns error" {
    run "$SCRIPT_PATH" -k "invalid_key_for_testing_12345"
    [ "$status" -eq 1 ]
}

@test "location from environment variables" {
    SITER_LAT=32.77 SITER_LON=-96.79 run "$SCRIPT_PATH"
    if [ "$status" -eq 0 ]; then
        [[ "$output" == *"32.77"* ]]
        [[ "$output" == *"-96.79"* ]]
    fi
}

@test "financial calculations are numeric" {
    run "$SCRIPT_PATH" --json -w 250
    if [ "$status" -eq 0 ]; then
        local annual_kwh monthly_savings payback_years

        annual_kwh=$(echo "$output" | jq -r '.production.annual_kwh')
        monthly_savings=$(echo "$output" | jq -r '.financials.monthly_savings')
        payback_years=$(echo "$output" | jq -r '.financials.payback_years')

        [[ "$annual_kwh" =~ ^[0-9]+$ ]]
        [[ "$monthly_savings" =~ ^[0-9]+\.[0-9]+$ ]]
        [[ "$payback_years" =~ ^[0-9]+\.[0-9]+$ ]]
    fi
}